JP2008240734A - Internal combustion engine with heat accumulator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide technology enabling a heat accumulator to accumulate heat as much as possible in an internal combustion engine with the heat accumulator. <P>SOLUTION: This invention relates to the internal combustion engine with the heat accumulator storing part of heat medium circulating in a heat medium channel formed in the internal combustion engine in an insulating manner, and rising temperature of the internal combustion engine by supplying the heat medium stored in an insulated manner to the heat medium channel. When high temperature heat medium is stored in the heat accumulator, load of the internal combustion engine is increased. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an internal combustion engine that is cooled or heated by circulation of a heat medium such as cooling water or lubricating oil, and more particularly to an internal combustion engine that includes a heat storage device that stores heat of the heat medium.

  When an internal combustion engine mounted in an automobile or the like is started in a cold state, the wall surface temperature of the intake port, the combustion chamber, etc. becomes low, so that it is difficult for the fuel to atomize and flame extinguishing occurs at the periphery of the combustion chamber This will cause a decrease in startability and a deterioration in exhaust emission.

  In order to solve such problems, a water-cooled internal combustion engine is provided with a heat storage device that retains high-temperature cooling water, and the internal combustion engine is supplied with cooling water stored in the heat storage device when the internal combustion engine is started. Techniques have been proposed to increase the temperature of the engine, thereby improving startability and speeding up warm-up.

As this type of technology, for example, a vehicle engine warm-up device as described in Patent Document 1 is known. A vehicle engine warm-up device described in this publication includes a heat retaining tank that retains and stores a part of the cooling water circulating through the internal combustion engine, and a mechanism that circulates the cooling water in the heat retaining tank to the internal combustion engine when the internal combustion engine is started. And only when the temperature of the cooling water circulating through the internal combustion engine becomes higher than the normal control water temperature, the temperature of the cooling water in the heat retaining tank is increased by storing a part of the cooling water in the heat retaining tank. Thus, it is intended to improve the warm-up property at the start of the internal combustion engine.
JP-A-8-183324

  By the way, in the above-mentioned conventional engine warm-up device, since the cooling water in the heat retaining tank is not replaced unless the temperature of the cooling water becomes higher than the normal control water temperature, the opportunity to store the high-temperature cooling water in the heat retaining tank is missed. There is a case.

  In particular, in the so-called short trip operation in which the operation of the internal combustion engine is stopped in a short time, the operation of the internal combustion engine is stopped before the temperature of the cooling water circulating through the internal combustion engine rises to the normal control water temperature. High temperature cooling water cannot be stored inside.

  Therefore, if the short trip operation as described above is repeated, a long time elapses in a state where the cooling water in the heat retaining tank is not replaced, so the temperature of the cooling water in the heat retaining tank decreases. Therefore, there is a possibility that the effect of providing the heat retaining tank cannot be obtained.

  The present invention has been made in view of the above-described problems, and in an internal combustion engine equipped with a heat storage device, as much heat as possible can be stored in the heat storage device regardless of the operating state of the internal combustion engine. It aims at providing the technology that can do.

The present invention employs the following means in order to solve the above-described problems. That is, an internal combustion engine provided with a heat storage device according to the present invention is formed in a cylinder head of an internal combustion engine, and a heat medium flow passage through which a heat medium flows and a part of the heat medium flowing through the heat medium flow passage are kept warm. A first heat medium passage that guides the heat medium stored in the heat storage device to the heat medium flow passage, and a second heat guide that leads the heat medium in the heat medium flow passage to the heat storage device. It is characterized by comprising a heat medium passage, and passage switching means for selectively conducting the first communication passage and the second communication passage.

  The internal combustion engine provided with this heat storage device is a first internal combustion engine provided with a heat storage device that retains and stores a part of the heat medium circulating in the internal combustion engine, and that directs the heat medium from the heat storage device to the heat medium flow passage of the cylinder head. In addition to the heat medium passage, the second heat medium passage for guiding the heat medium from the heat medium flow passage of the cylinder head to the heat storage device, the first heat medium passage, and the second heat medium passage are alternatively selected. The most characteristic feature is that it is provided with a passage switching means for conducting the current to.

  In the internal combustion engine equipped with such a heat storage device, the passage switching means makes the first heat medium passage conductive, so that the high-temperature heat medium stored in the heat storage device directly through the first heat medium passage. And the passage switching means conducts the second heat medium passage so that the high-temperature heat medium in the heat medium flow passage is directly passed through the second heat medium passage. Is supplied to the heat storage device.

  When the heat medium is directly exchanged between the heat medium flow passage and the heat storage device in this way, heat loss when supplying the heat medium from the heat storage device to the heat medium flow passage is minimized. In addition, heat loss when supplying the heat medium from the heat medium flow path to the heat storage device is also suppressed to a minimum. As a result, even if the heat medium in the heat medium flow passage has a small amount of heat, the small amount of heat is efficiently stored in the heat storage device.

  Here, the passage switching means makes the first heat medium passage conductive when heating the internal combustion engine, and makes the second heat medium passage conductive when storing the high-temperature heat medium in the heat storage device. Good.

  In this case, the passage switching means conducts the first heat medium passage, whereby the heat stored in the heat storage device is efficiently transmitted to the cylinder head, and the passage switching means conducts the second heat medium passage. By doing so, the heat of the heat medium in the heat medium flow passage is efficiently supplied to the heat storage device.

  Next, the internal combustion engine provided with the heat storage device according to the present invention can employ the following means. That is, an internal combustion engine provided with a heat storage device according to the present invention is formed in an internal combustion engine, a heat medium flow passage through which a heat medium flows, and a heat medium cooling mechanism that cools the heat medium that flows through the heat medium flow passage. A heat storage device for warming and storing a part of the heat medium flowing through the heat medium flow passage, and for warming up the internal combustion engine by supplying the heat medium stored and kept warm to the heat medium flow passage, and the heat storage Cooling prohibiting means for prohibiting the operation of the heat medium cooling mechanism when storing a high temperature heat medium in the apparatus may be provided.

  An internal combustion engine provided with the heat storage device is an internal combustion engine provided with a heat medium heat medium cooling mechanism that cools a heat medium circulating in the internal combustion engine and a heat storage device that retains and stores a part of the heat medium. When storing the medium in the heat storage device, the greatest feature is that the operation of the heat medium cooling mechanism is prohibited.

  In an internal combustion engine equipped with such a heat storage device, when the internal combustion engine is in a normal operating state, the heat generated by the combustion of the fuel is transferred to the heat medium flowing through the heat medium flow passage, so the temperature of the heat medium rises. At the same time, the heat absorption capacity of the heat medium is reduced, but the heat medium is cooled by the heat medium cooling mechanism, whereby the temperature of the heat medium is lowered and the heat absorption capacity of the heat medium is reproduced.

  When the heat medium cooled by the heat medium cooling mechanism flows through the heat medium flow path, the heat of the internal combustion engine is transmitted to the heat medium, so that overheating of the internal combustion engine is prevented, and as a result, the internal combustion engine is kept at an appropriate temperature. Will be.

  On the other hand, when the internal combustion engine is cold-started, etc., the high-temperature heat medium stored in the heat storage device is supplied to the heat medium flow passage, whereby the heat of the heat medium is transmitted to the internal combustion engine, The temperature of the internal combustion engine will rise.

  Here, focusing on the point of warming up the internal combustion engine early, it can be said that the higher the temperature of the heat medium stored in the heat storage device, the better. Therefore, in the internal combustion engine equipped with the heat storage device according to the present invention, the cooling prohibiting means prohibits the operation of the heat medium cooling mechanism when a high-temperature heat medium is stored in the heat storage device.

  In this case, a high-temperature heat medium that is not cooled by the heat medium cooling mechanism is stored in the heat storage device.

  Note that the cooling prohibiting unit may continuously prohibit the operation of the heat medium cooling mechanism during a period from when the internal combustion engine is started until the heat medium is stored in the heat storage device. In this case, since the heat medium flowing through the heat medium flow passage is not cooled by the heat medium cooling mechanism, the temperature of the heat medium flowing through the heat medium flow passage is increased quickly, and the heat to the heat storage device is accordingly increased. The storage of the medium can be completed early.

  In the present invention, examples of the heat medium cooling mechanism include a heat exchanger that exchanges heat between the heat medium and the outside air, and a blower that pumps outside air to the heat exchanger. In this way, when the heat medium cooling mechanism includes the heat exchanger and the blower, the cooling prohibiting unit can be configured to prohibit the operation of the blower.

  Next, the internal combustion engine provided with the heat storage device according to the present invention can employ the following means. That is, an internal combustion engine provided with the heat storage device according to the present invention is formed in the internal combustion engine, and a heat medium flow passage for circulating the heat medium, and a heat medium cooling mechanism for cooling the heat medium flowing through the heat medium flow passage, , A heat storage device that keeps a part of the heat medium flowing through the heat medium flow passage, and supplies the heat medium that has been kept warm to the heat medium flow passage to raise the temperature of the internal combustion engine, and the heat storage device And a flow rate restricting means for restricting a flow rate of the heat medium flowing through the heat medium cooling mechanism when storing a high temperature heat medium.

  An internal combustion engine provided with the heat storage device is an internal combustion engine provided with a heat medium heat medium cooling mechanism that cools a heat medium circulating in the internal combustion engine and a heat storage device that retains and stores a part of the heat medium. When storing the medium in the heat storage device, the greatest feature is to reduce the flow rate of the heat medium flowing through the heat medium cooling mechanism.

  In an internal combustion engine equipped with such a heat storage device, when the internal combustion engine is in a normal operating state, the heat generated by the combustion of the fuel is transferred to the heat medium flowing through the heat medium flow passage, so the temperature of the heat medium rises. At the same time, the heat absorption capacity of the heat medium is reduced, but the heat medium is cooled by the heat medium cooling mechanism, whereby the temperature of the heat medium is lowered and the heat absorption capacity of the heat medium is reproduced.

  On the other hand, when a high-temperature heat medium is stored in the heat storage device, the flow rate restricting means restricts the flow rate of the heat medium flowing through the heat medium cooling mechanism. In this case, since the amount of the heat medium flowing through the heat medium cooling mechanism per unit time decreases, the amount of the heat medium cooled per unit time decreases, and as a result, the temperature decrease rate of the heat medium per unit time. Decreases.

  Thus, when the rate of temperature decrease per unit time of the heat medium decreases, a relatively high temperature heat medium is stored in the heat storage device.

  Next, the internal combustion engine provided with the heat storage device according to the present invention can employ the following means. That is, an internal combustion engine provided with a heat storage device according to the present invention is formed in an internal combustion engine, and stores a heat medium flow path through which a heat medium flows and a part of the heat medium flowing through the heat medium flow path while keeping warm. A heat storage device that heats and stores the heat medium stored in the heat medium flow passage to increase the temperature of the internal combustion engine, and a part of the heat medium that flows through the heat medium flow passage at a predetermined storage time is stored in the heat storage device. And a storage timing setting means for updating the storage time every time the storage processing by the storage processing means is completed and for setting an initial value of the storage time earlier than usual. May be.

  The internal combustion engine provided with the heat storage device completes the storage process of the heat medium in the heat storage device in the internal combustion engine provided with the heat storage device that stores part of the heat medium flowing through the heat medium flow passage at a predetermined storage time. The greatest feature is that the storage time is updated every time and the initial value of the storage time is set earlier than usual.

  In an internal combustion engine equipped with such a heat storage device, at a predetermined storage time, the storage processing means stores a part of the heat medium flowing through the heat medium flow passage in the heat storage device. Next, the storage time setting means updates the storage time and sets the next storage time. Thereafter, when the storage time after the update is reached, the storage processing means performs the storage process again and the storage time setting means updates the storage time.

  At that time, the initial value of the storage time, that is, the first storage time after the start of the internal combustion engine is set earlier than the normal storage time, so that the operation of the internal combustion engine is stopped in a relatively short time. However, a part of the heat medium flowing through the heat medium flow passage can be stored in the heat storage device.

  Further, in the above-described heat storage device, when the operation of the internal combustion engine is continued for a relatively long time, the storage process by the storage processing means and the storage time update process by the storage time setting means are alternately repeated. Therefore, the temperature of the heat medium stored in the heat storage device is gradually increased.

  Therefore, in the internal combustion engine provided with the above-described heat storage device, the maximum amount of heat is stored in the heat storage device within a range corresponding to the operation condition of the internal combustion engine.

  Further, in the internal combustion engine including the heat storage device according to the present invention, the storage time may be a time when the temperature of the heat medium flowing through the heat medium flow passage becomes equal to or higher than a predetermined storage temperature. In this case, the storage time setting means updates the storage temperature every time the storage processing by the storage processing means is completed, and sets the initial value of the storage temperature lower than the temperature of the heat medium after completion of warming up of the internal combustion engine. It is preferable to do.

  At that time, the storage time setting means may set the storage temperature to be lower as the temperature of the internal combustion engine and / or the outside air temperature at the time of starting is lower.

  This is because the temperature increase rate of the heat medium in the heat medium flow passage decreases as the temperature of the internal combustion engine and / or the outside air temperature at the time of start-up decreases, so that the storage temperature is relatively high in such a situation. When set, it takes time for the temperature of the heat medium in the heat medium flow passage to reach the storage temperature, and the operation of the internal combustion engine may be stopped before the heat medium reaches the storage temperature. .

  Further, in the internal combustion engine including the heat storage device according to the present invention, the storage time may be a time when the operation time from the start of the internal combustion engine is equal to or longer than a predetermined storage time. In this case, the storage time setting means updates the storage time every time the storage processing by the storage processing means is completed, and sets the initial value of the storage time to be shorter than the time required from the start of the internal combustion engine to the completion of warm-up. It is preferable to set.

  Further, in the internal combustion engine provided with the heat storage device according to the present invention, the storage time may be a time when the travel distance from the start of the internal combustion engine is equal to or greater than a predetermined storage distance. In this case, the storage time setting means updates the storage distance every time the storage processing by the storage processing means is completed, and sets the initial value of the storage distance from the travel distance required from the start of the internal combustion engine to the completion of warm-up. It is preferable to set it short.

  Further, in the internal combustion engine including the heat storage device according to the present invention, the storage time setting means may increase the renewal amount of the storage time as the temperature increase rate per unit time of the heat medium increases.

  This is because, as the temperature increase rate per unit time of the heat medium increases, the heat medium heats up in a shorter time. Therefore, as the temperature increase rate per unit time of the heat medium increases, the renewal amount of the storage time increases. This is because a higher-temperature heat medium can be stored in the heat storage device without unnecessarily delaying the time when the heat medium is stored in the heat storage device.

  Further, in the internal combustion engine provided with the heat storage device according to the present invention, the storage time setting means may increase the update amount of the storage time as the temperature of the internal combustion engine and / or the outside air temperature at the time of start-up increases.

  This is because, as the temperature of the internal combustion engine and / or the outside air temperature at the time of start-up increases, the temperature rise rate of the heat medium increases, and the temperature of the heat medium rises in a shorter time accordingly. Even if the renewal amount of the storage time is increased as the engine temperature and / or the outside air temperature becomes higher, a higher temperature heat medium is stored in the heat storage device without unnecessarily delaying the time when the heat medium is stored in the heat storage device. This is because it becomes possible.

  Next, the internal combustion engine provided with the heat storage device according to the present invention can employ the following means. That is, an internal combustion engine provided with a heat storage device according to the present invention is formed in an internal combustion engine and retains a heat medium flow passage through which a heat medium flows and a part of the heat medium flowing through the heat medium flow passage while keeping warm. A heat storage device that supplies the heat medium stored in a warm state to the heat medium flow passage to raise the temperature of the internal combustion engine, and a temperature of the heat medium in the heat medium flow passage is higher than a temperature of the heat medium in the heat storage device. Temperature comparing means for determining whether the temperature is high, and when the temperature comparing means determines that the temperature of the heat medium in the heat medium flow passage is higher than the temperature of the heat medium in the heat storage device, the heat medium You may make it provide the storage processing means to which the said thermal storage apparatus stores a part of heat medium which flows through the inside of a flow path.

  The internal combustion engine provided with this heat storage device is an internal combustion engine provided with a heat storage device that retains and stores a part of the heat medium circulating in the internal combustion engine, and the temperature of the heat medium circulating in the internal combustion engine is the temperature of the heat medium in the heat storage device. When the temperature becomes higher than the temperature, store a part of the heat medium circulating in the internal combustion engine in the heat storage device, in other words, replace the heat medium in the heat storage device with the heat medium circulating in the internal combustion engine. It is a feature.

In an internal combustion engine equipped with such a heat storage device, the temperature comparison means compares the temperature of the heat medium flowing through the heat medium flow passage of the internal combustion engine with the temperature of the heat medium in the heat storage device. Then, when it is determined by the temperature comparison means that the temperature of the heat medium in the heat medium flow passage is higher than the temperature of the heat medium in the heat storage device, the storage processing means is a part of the heat medium flowing in the heat medium flow passage. The part is stored in a heat storage device.

  In this case, since the heat medium stored in the heat storage device is replaced when the temperature of the heat medium in the heat medium flow passage becomes higher than the temperature of the heat medium in the heat storage device, the heat in the heat medium flow passage is changed. Even when the temperature of the medium does not rise to a desired high temperature range, the amount of heat stored in the heat storage device can be increased.

  In the present invention, the temperature comparison means determines whether or not the temperature of the heat medium in the heat medium flow passage is higher than the temperature of the heat medium in the heat storage device every predetermined time, and the storage processing means When the temperature of the heat medium in the heat medium flow passage is determined to be higher than the temperature of the heat medium in the heat storage device by the comparison means, a part of the heat medium flowing in the heat medium flow passage is stored in the heat storage device. May be.

  In this case, every time the temperature of the heat medium in the heat medium flow passage becomes higher than the temperature of the heat medium in the heat storage device, the heat medium stored in the heat storage device is replaced, so that the operation of the internal combustion engine is continued and As long as the temperature of the heat medium in the heat medium flow path rises, the temperature of the heat medium stored in the heat storage device is gradually increased.

  The temperature comparison means may perform the comparison process every predetermined time as described above when the internal combustion engine is in an operating state, and may perform the comparison process at least once immediately after the operation of the internal combustion engine is stopped. When it is determined that the temperature of the heat medium in the heat medium flow passage is higher than the temperature of the heat medium in the heat storage device in the comparison process immediately after the shutdown of the internal combustion engine, the storage processing means A part of the heat medium may be stored in the heat storage device.

  In the present invention, the temperature comparison means determines whether the temperature of the heat medium in the heat medium flow passage is higher than a predetermined temperature as compared with the temperature of the heat medium in the heat storage device, and the storage processing means Each time the temperature comparing means determines that the temperature of the heat medium in the heat medium flow passage is higher than the temperature of the heat medium in the heat storage device by a predetermined temperature or more, one of the heat medium flowing in the heat medium flow passage. You may make it store a part in a thermal storage apparatus.

  This is because if the storage process is simply triggered by the fact that the temperature of the heat medium in the heat medium flow passage is higher than that of the heat medium in the heat storage device, the storage process is performed under circumstances where the temperature of the heat medium tends to rise. This is because the execution frequency may increase excessively. Furthermore, it is necessary to consider the heat loss until the heat medium reaches the heat storage device from the heat medium flow path.

  The predetermined temperature described above is preferably set higher as the temperature increase rate per unit time of the heat medium becomes higher.

  Next, the internal combustion engine provided with the heat storage device according to the present invention can employ the following means. That is, an internal combustion engine provided with a heat storage device according to the present invention is formed in an internal combustion engine and retains a heat medium flow passage through which a heat medium flows and a part of the heat medium flowing through the heat medium flow passage while keeping warm. A heat storage device that supplies the heat medium stored in a warm state to the heat medium flow passage to raise the temperature of the internal combustion engine, and a storage process that stores a part of the heat medium flowing in the heat medium flow passage in the heat storage device And when the temperature of the heat medium in the heat medium flow passage becomes higher than the temperature of the heat medium when the previous storage process is performed by the storage process means, the storage process means is operated. And a control means.

An internal combustion engine equipped with this heat storage device includes a heat storage device that retains and stores part of the heat medium circulating in the internal combustion engine, and storage processing means that stores a part of the heat medium flowing in the heat medium flow passage in the heat storage device. In the internal combustion engine having the above, the largest feature is that the storage process is performed again when the temperature of the heat medium in the heat medium flow passage becomes higher than the temperature of the heat medium when the previous storage process was performed. Yes.

  In the internal combustion engine provided with such a heat storage device, the control means compares the temperature of the heat medium when the previous storage processing is performed by the storage processing means with the temperature of the heat medium flowing through the heat medium flow passage at the present time. .

  At that time, if the temperature of the heat medium at the current time is higher than the temperature of the heat medium when the previous storage process is performed, the control means operates the storage process means to A part of the heat medium is stored in the heat storage device.

  As a result, the heat medium in the heat storage device is replaced with a heat medium having a higher temperature than when the previous storage process was performed.

  Therefore, in the internal combustion engine having the above-described heat storage device, the heat medium in the heat medium flow passage at the current time is stored in the heat storage device when the temperature of the heat medium becomes higher than the temperature of the heat medium at the time of the previous heat storage heat treatment. Therefore, even if the temperature of the heat medium in the heat medium flow passage does not rise to a desired high temperature region, the heat storage amount of the heat storage device increases.

  Furthermore, since the heat medium stored in the heat storage device is replaced every time the temperature of the heat medium in the heat medium flow passage at the current time becomes higher than the temperature of the heat medium at the time of the previous storage process, the operation of the internal combustion engine As long as this is continued and the temperature of the heat medium in the heat medium flow passage rises, the temperature of the heat medium stored in the heat storage device is gradually increased.

  Next, the internal combustion engine provided with the heat storage device according to the present invention can employ the following means. That is, an internal combustion engine provided with a heat storage device according to the present invention is formed in an internal combustion engine and retains a heat medium flow passage through which a heat medium flows and a part of the heat medium flowing through the heat medium flow passage while keeping warm. A heat storage device that heats the heat medium stored in the heat medium flow path to increase the temperature of the internal combustion engine, and when the temperature of the heat medium flowing through the heat medium flow path is equal to or higher than a predetermined storage temperature. Storage processing means for storing a part of the heat medium in the heat storage device, and storage temperature correction means for lowering the storage temperature as the temperature of the internal combustion engine and / or the outside air temperature at the time of starting decreases. Good.

  The internal combustion engine provided with the heat storage device is started in the internal combustion engine provided with the heat storage device for storing a part of the heat medium when the temperature of the heat medium flowing through the heat medium flow passage rises to a predetermined storage temperature. The greatest feature is that the storage temperature is set lower as the temperature of the internal combustion engine and / or the outside air temperature becomes lower.

  This is because the temperature increase rate of the heat medium in the heat medium flow passage decreases as the temperature of the internal combustion engine and / or the outside air temperature at the time of start-up decreases, so that the storage temperature is relatively high in such a situation. When set, it takes time for the temperature of the heat medium in the heat medium flow passage to reach the storage temperature, and the operation of the internal combustion engine may be stopped before the heat medium reaches the storage temperature. .

  In each of the above-described inventions, when the operation period of the internal combustion engine (the period from the start to the operation stop) is extremely short, it is assumed that the heat medium stored in the heat storage device cannot be replaced even once.

On the other hand, an internal combustion engine provided with a heat storage device according to the present invention is formed in an internal combustion engine, and a heat medium flow passage that circulates the heat medium and a part of the heat medium that circulates through the heat medium flow passage are kept warm. In addition, a heat storage device that heats the heat medium stored in the heat medium flow passage to increase the temperature of the internal combustion engine, and when the heat medium flowing through the heat medium flow passage satisfies a predetermined condition, the heat medium Storage processing means for storing a part of the heat storage device in the heat storage device, and a part of the heat medium flowing through the heat medium flow passage in the period from the start to the shutdown of the internal combustion engine cannot be stored in the heat storage device In this case, the engine stop storage means for storing a part of the heat medium in the heat medium flow passage in the heat storage container when the operation of the internal combustion engine is stopped may be provided.

  In the internal combustion engine provided with the heat storage device configured as described above, when the heat medium flowing through the heat medium flow passage cannot satisfy the predetermined condition in the period from the start of the internal combustion engine to the operation stop, in other words, Even when a part of the heat medium flowing through the heat medium flow passage cannot be stored in the heat storage device during the period from the start of the internal combustion engine to the operation stop, the operation of the internal combustion engine is performed by the engine stop storage means. When is stopped, a part of the heat medium in the heat medium flow passage is stored in the heat storage container.

  As a result, an opportunity to store the heat medium flowing through the heat medium flow passage in the heat storage device is secured, and the heat of the heat medium can be reliably stored in the heat storage device.

  Examples of the predetermined condition include conditions such that the temperature of the heat medium is equal to or higher than a preset temperature, and the temperature of the heat medium is higher than the temperature of the heat medium in the heat storage device.

  The internal combustion engine provided with the heat storage device further includes heating means for heating the heat medium in the heat medium flow passage, and the storage means when the engine is stopped heats the heat medium in the heat medium flow passage by the heating means. After that, it may be stored in the heat storage device.

  Next, the internal combustion engine provided with the heat storage device according to the present invention may be specified to adopt the following means. That is, an internal combustion engine equipped with a heat storage device according to the present invention is formed in an internal combustion engine, and stores a heat medium flow path through which a heat medium flows and a part of the heat medium flowing through the heat medium flow path while keeping warm. A heat storage device that supplies the heat medium stored in a warm state to the heat medium flow passage to increase the temperature of the internal combustion engine, and increases a load of the internal combustion engine when the high-temperature heat medium is stored in the heat storage device Engine load increasing means.

  The present invention forcibly increases the load of an internal combustion engine when storing a high-temperature heat medium in a heat storage device in an internal combustion engine having a heat storage device that retains and stores a part of the heat medium circulating in the internal combustion engine. This is the biggest feature.

  In the internal combustion engine provided with such a heat storage device, the engine load increasing means increases the load of the internal combustion engine when the heat medium is to be stored in the heat storage device. When the load on the internal combustion engine is increased, at least the amount of fuel out of the fuel and air used for combustion in the internal combustion engine is increased, so that the heat generation amount of the internal combustion engine is increased.

  When the heat generation amount of the internal combustion engine increases in this way, the amount of heat received from the internal combustion engine by the heat medium flowing through the heat medium flow passage of the internal combustion engine increases, so the amount of heat contained in the heat medium flowing through the heat medium flow passage As the temperature increases, the temperature of the heat medium rises.

  Therefore, the internal combustion engine provided with the heat storage device according to the present invention increases the load of the internal combustion engine when the heat medium is to be stored in the heat storage device, so that the internal combustion engine heats the heat medium. Thus, a high-temperature heat medium is stored in the heat storage device.

Here, as a method of increasing the load of the internal combustion engine, (1) a method of reducing the opening of the exhaust throttle valve provided in the exhaust passage of the internal combustion engine, and (2) changing the opening / closing timing of the exhaust valve of the internal combustion engine. A method of advancing the opening timing of the exhaust valve by a variable valve mechanism, (3) a method of retarding the opening timing of the exhaust valve by a variable valve mechanism that changes the opening / closing timing of the exhaust valve of the internal combustion engine, (4 ) A method of retarding the opening timing of the intake valve by a variable valve operating mechanism that changes the opening / closing timing of the intake valve of the internal combustion engine. (5) Amount of power generated by a generator that generates electricity using a part of the output of the internal combustion engine as a drive source. (6) A method of operating a braking mechanism of a vehicle equipped with an internal combustion engine, (7) A method of prohibiting the change of the transmission gear ratio of the transmission provided in the internal combustion engine to the speed increasing side, (8) Change the gear ratio of the transmission installed in the internal combustion engine to the deceleration side. Law, etc. can be exemplified.

  Examples of the heat medium according to the present invention include cooling water for water-cooled internal combustion engines and lubricating oil (engine oil) for internal combustion engines.

  According to the internal combustion engine provided with the heat storage device according to the present invention, suppression of heat loss when the heat medium is stored in the heat storage device, early timing of storing the heat medium in the heat storage device, storage of the heat medium in the heat storage device It is possible to increase the temperature of the heat medium during storage, or to ensure the opportunity to store the heat medium in the heat storage device, so that the maximum amount of heat can be stored in the heat storage device regardless of the operating conditions of the internal combustion engine It becomes. As a result, it is possible to make the most of the functions of the heat storage device, contributing to reduction of exhaust emission, improvement of startability, shortening of warm-up time, and the like.

  Hereinafter, a specific embodiment of an internal combustion engine provided with a heat storage device according to the present invention will be described based on the drawings.

<First Embodiment>
First, a first embodiment of an internal combustion engine provided with a heat storage device according to the present invention will be described with reference to FIGS.

  FIG. 1 is a diagram showing a cooling water circulation system of a vehicle internal combustion engine to which the present invention is applied. In FIG. 1, an internal combustion engine 1 is a water-cooled internal combustion engine using gasoline or light oil as a fuel, and includes a cylinder head 1a and a cylinder block 1b.

  The internal combustion engine 1 is provided with a starter motor 100 that rotates a crankshaft (not shown) of the internal combustion engine 1 when drive power is applied.

  The cylinder head 1a and the cylinder block 1b are respectively formed with a head side cooling water channel 2a and a block side cooling water channel 2b for circulating cooling water as a heat medium, and the head side cooling water channel 2a and the block side cooling channel 2b. The water channel 2b communicates with each other. The head side cooling water passage 2a corresponds to a heat medium flow passage according to the present invention.

  A first cooling water channel 4 is connected to the head side cooling water channel 2 a, and the first cooling water channel 4 is connected to a cooling water inlet of the radiator 5. A cooling water outlet of the radiator 5 is connected to a thermostat valve 7 via a second cooling water channel 6.

  The radiator 5 is a heat exchanger that exchanges heat between cooling water and outside air. The radiator 5 is provided with a radiator fan 50 as a blower that pumps outside air to the radiator 5. The radiator fan 50 is driven by a fan motor 50a. The radiator 5 and the radiator fan 50 described above correspond to the heat medium cooling mechanism according to the present invention.

  In addition to the second cooling water channel 6 described above, a third cooling water channel 8 and a fourth cooling water channel 9 are connected to the thermostat valve 7. The third cooling water channel 8 is connected to a suction port of a mechanical water pump 10 driven by a rotational torque of a crankshaft (not shown), and a discharge port of the mechanical water pump 10 is connected to the block side cooling water channel 2b. ing. On the other hand, the fourth cooling water channel 9 communicates with the head side cooling water channel 2a.

The thermostat valve 7 is a flow path switching valve that closes one of the second cooling water path 6 and the fourth cooling water path 9 according to the temperature of the circulating cooling water. Specifically, the thermostat valve 7 shuts off the second cooling water passage 6 and simultaneously opens the fourth cooling water passage 9 when the temperature of the cooling water flowing through the thermostat valve 7 is equal to or lower than a predetermined valve opening temperature: T _1. It opens and the 3rd cooling water channel 8 and the 4th cooling water channel 9 are made into conduction. When the temperature of the cooling water flowing through the thermostat valve 7 is higher than the valve opening temperature: T ₁ , the thermostat valve 7 opens the second cooling water channel 6 and simultaneously shuts off the fourth cooling water channel 9 to perform the third cooling. The water channel 8 and the second cooling water channel 6 are electrically connected.

  Next, the base end of the heater hose 11 is connected to the head side cooling water channel 2a, and the terminal end of the heater hose 11 is the third cooling water channel 8 connecting the thermostat valve 7 and the mechanical water pump 10 described above. Connected on the way.

  In the middle of the heater hose 11, a heater core 12 for exchanging heat between the cooling water and the air for heating the vehicle interior is disposed. The heater core 12 is also provided with a heater blower 120 that pressure-feeds the heating air that has been heat-exchanged with the cooling water in the heater core 12 into the passenger compartment. The heater blower 120 is activated when the heater switch 21 provided in the passenger compartment is in an ON state.

  A heat storage container 13 is disposed in a portion of the heater hose 11 located between the proximal end of the heater hose 11 and the heater core 12. The heat storage container 13 is a container for storing cooling water in a heat storage state. The cooling water inlet 13 c for allowing the cooling water to flow into the heat storage container 15 from the heater hose 11 and the heater hose 11 from the heat storage container 15. And a cooling water outlet 13d for allowing the cooling water to flow out.

  The cooling water inlet 13c and the cooling water outlet 13d are respectively provided with one-way valves (one-way valves) 13a and 13b for preventing a reverse flow of the cooling water.

  When new cooling water flows into the heat storage container 13 configured in this manner from the cooling water inlet 13c, high-temperature cooling water (hereinafter referred to as heat storage hot water) stored in the heat storage container 13 is used instead. It discharges from the cooling water outlet 13d.

  The heat storage container 13 is connected to the heater hose 11 so that the cooling water inlet 13c of the heat storage container 13 is located on the terminal end side of the heater hose 11 and the cooling water outlet 13d is located on the base end side of the heater hose 11. Shall be connected.

  Next, an electric water pump 14 is disposed in a portion of the heater hose 11 located between the heat storage container 13 and the heater core 12. The electric water pump 14 is a pump driven by an electric motor, and is configured to discharge the cooling water sucked from the suction port of the electric water pump 14 at a predetermined pressure from the discharge port.

  The electric water pump 14 is connected to the heater hose 11 so that the suction port of the electric water pump 14 is located on the terminal end side of the heater hose 11 and the discharge port is located on the base end side of the heater hose 11. Shall.

  Further, the base end of the first bypass passage 15 is connected to a portion of the heater hose 11 located between the base end of the heater hose 11 and the heat storage container 13. The end of the first bypass passage 15 is connected to a portion of the heater hose 11 located between the electric water pump 14 and the heater core 12.

  Further, the base end of the second bypass passage 16 is connected to a portion of the heater hose 11 located between the base end of the heater hose 11 and the base end of the first bypass passage 15. The end of the second bypass passage 16 is connected to a portion of the heater hose 11 located between the electric water pump 14 and the end of the first bypass passage 15.

  Hereinafter, in the heater hose 11, a portion located between the proximal end of the heater hose 11 and the proximal end of the second bypass passage 16 is referred to as a first heater hose 11a, and the proximal end of the second bypass passage 16 and the A portion located between the base end of the first bypass passage 15 is referred to as a second heater hose 11b, and a portion located between the base end of the first bypass passage 15 and the heat storage container 13 is referred to as a third heater hose 11c. A portion located between the heat storage container 13 and the electric water pump 14 is referred to as a fourth heater hose 11d, and a portion located between the electric water pump 14 and the end of the second bypass passage 16 is designated as the fifth heater hose 11e. The portion located between the end of the second bypass passage 16 and the end of the first bypass passage 15 is referred to as a sixth heater hose 11f, and the end of the first bypass passage 15 is The site located between the stator core 12 is referred to as a seventh heater hose 11g, it will be referred to site located between the further end of the heater core 12 and the heater hose 11 and the eighth heater hose 11h.

  A first flow path switching valve 17 is provided at a connection portion between the sixth heater hose 11 f, the seventh heater hose 11 g, and the first bypass passage 15. The first flow path switching valve 17 is a valve that selectively switches between the conduction of the three passages and the blocking of any one of the three passages. The first flow path switching valve 17 is driven by, for example, an actuator including a step motor (not shown).

  A second flow path switching valve 18 is provided at a connection portion between the first heater hose 11 a, the second heater hose 11 b, and the second bypass passage 16. The second flow path switching valve 18 is a valve that selectively switches between the conduction of the three passages and the blocking of any one of the three passages. The first flow path switching valve 17 is driven by, for example, an actuator including a step motor (not shown).

  A water temperature sensor 19 that outputs an electric signal corresponding to the temperature of the cooling water flowing in the first cooling water passage 4 is attached to the first cooling water passage 4 in the vicinity of the internal combustion engine 1.

In the cooling system of the internal combustion engine 1 configured as described above, an electronic control unit (ECU) 20 for controlling the cooling system is provided. This ECU 20
May be an electronic control unit that exclusively controls the cooling water circulation system, or may be an electronic control unit that serves both as control of the cooling water circulation system and control of the internal combustion engine 1.

  In addition to the water temperature sensor 19 described above, the ECU 20 is electrically connected to a heater switch 21, an ignition switch 22, and a starter switch 23 that are mounted in the vehicle interior, and an electric water pump 14, a first flow path. The switching valve 17, the second flow path switching valve 18, the fan motor 50a, the starter motor 100, and the heater blower 120 are electrically connected.

The ECU 20 uses the operation state of the internal combustion engine 1 and output signal values of various sensors as parameters, and the electric water pump 14, the first flow path switching valve 17, the second flow path switching valve 18, the fan motor 50a, the starter motor. 100 and the heater blower 120 are controlled.

  The operation of the internal combustion engine provided with the heat storage device in this embodiment will be described below. First, the case where the internal combustion engine 1 is preheated prior to the start of the internal combustion engine 1 will be described. Here, it is assumed that high-temperature cooling water is stored in the heat storage container 13 in advance.

  The ECU 20 shuts off the first bypass passage 15 and starts the sixth heater hose 11f and the seventh heater hose before cranking of the internal combustion engine 1 is started, for example, when the ignition switch 22 is switched from OFF to ON. The first flow path switching valve 17 is controlled to turn on 11g, the second bypass passage 16 is shut off, and the second flow path switching valve 18 is turned on to connect the first heater hose 11a and the second heater hose 11b. In addition, driving electric power is supplied to the electric water pump 14 in order to operate the electric water pump 14.

  In this case, since the mechanical water pump 10 does not operate and only the electric water pump 14 operates, as shown in FIG. 2, the electric water pump 14 → the fourth heater hose 11d → the heat storage container 13 → the third heater hose 11c. → second heater hose 11b → second flow path switching valve 18 → first heater hose 11a → head side cooling water path 2a → block side cooling water path 2b → mechanical water pump 10 → third cooling water path 8 → 8th heater hose A circulation circuit through which cooling water flows is formed in the order of 11h → heater core 12 → seventh heater hose 11g → first flow path switching valve 17 → sixth heater hose 11f → fifth heater hose 11e → electric water pump 14.

  When the circulation circuit as described above is established, the cooling water discharged from the electric water pump 14 flows into the heat storage container 13 via the fourth heater hose 11d, and is stored in the heat storage container 13 instead of the heat storage hot water. Is discharged from the heat storage container 13. The stored hot water discharged from the heat storage container 13 flows into the head side cooling water passage 2a via the third heater hose 11c, the second heater hose 11b, the second flow path switching valve 18, and the first heater hose 11a. Then, it flows into the block side cooling water channel 2b. The path from the heat storage container 13 to the head side cooling water path 2a via the third heater hose 11c, the second heater hose 11b, the second flow path switching valve 18, and the first heater hose 11a is the second aspect of the present invention. This corresponds to one heat medium passage.

  When the heat storage hot water from the heat storage container 13 flows into the head side cooling water channel 2a and the block side cooling water channel 2b of the internal combustion engine 1, the low temperature cooling originally retained in the head side cooling water channel 2a and the block side cooling water channel 2b instead of replacing it. Water flows out from the head side cooling water channel 2 a and the block side cooling water channel 2 b to the first cooling water channel 4.

  As a result, in the internal combustion engine 1, the heat of the heat storage hot water is transmitted to the wall surfaces of the head side cooling water channel 2a and the block side cooling water channel 2b. In particular, in the above-described circulation circuit, the heat storage hot water flows into the head side cooling water passage 2a and then into the block side cooling water passage 2b, so that the cylinder head 1a is preheated preferentially. As a result, the wall surface temperature and the intake air temperature of an intake port (not shown) of the cylinder head 1a are increased, so that fuel vaporization is promoted and the temperature of the air-fuel mixture is increased during and after the internal combustion engine 1 is started. It is possible to reduce the amount of fuel attached to the wall surface, stabilize combustion, improve startability, and improve exhaust emission.

  Further, in the above-described circulation circuit, the heat storage container 13 and the head side cooling water passage 2a of the internal combustion engine 1 communicate directly with each other without passing through the heater core 12, etc., and therefore in the path from the heat storage container 13 to the head side cooling water passage 2a. Unnecessary heat dissipation of heat storage hot water is suppressed. As a result, the heat stored in the heat storage container 13 is efficiently transmitted to the internal combustion engine 1.

  Therefore, according to the circulation circuit described above, the internal combustion engine 1 can be sufficiently preheated even with a small amount of heat, thereby improving startability, stabilizing combustion, shortening the warm-up operation time, and the like. It becomes possible to plan.

  Next, when the starter switch 23 is switched from OFF to ON, the ECU 20 stops supplying the driving power to the electric water pump 14, and then applies the driving power to the starter motor 100, a fuel injection valve (not shown), or the like. The cranking of the engine 1 is started, and the internal combustion engine 1 is started.

  When cranking of the internal combustion engine 1 is started, the mechanical water pump 10 is driven by the rotational torque of the crankshaft. In response to this, the ECU 20 controls the first flow path switching valve 17 to cut off the seventh heater hose 11g and / or controls the second flow path switching valve 18 to cut off the first heater hose 11a. At the same time, the electric water pump 14 is stopped.

At this time, if the temperature of the cooling water is equal to or lower than the opening temperature T ₁ of the thermostat valve 7, the thermostat valve 7 shuts off the second cooling water passage 6 and simultaneously opens the fourth cooling water passage 9. As described above, the circulation of the cooling water flows in the order of the mechanical water pump 10 → the block side cooling water channel 2b → the head side cooling water channel 2a → the fourth cooling water channel 9 → the thermostat valve 7 → the third cooling water channel 8 → the mechanical water pump 10. A circuit is established.

  In this case, since the relatively low-temperature cooling water flowing out from the internal combustion engine 1 flows around the radiator 5, the cooling water is not cooled more than necessary by the radiator 5.

  As a result, the internal combustion engine 1 is not unnecessarily cooled by the cooling water, and warming up of the internal combustion engine 1 is not hindered.

Thereafter, when the temperature of the cooling water becomes higher than the opening temperature T ₁ of the thermostat valve 7, the thermostat valve 7 opens the second cooling water passage 6 and simultaneously shuts off the fourth cooling water passage 9, as shown in FIG. , Mechanical water pump 10 → block side cooling water channel 2b → head side cooling water channel 2a → first cooling water channel 4 → radiator 5 → second cooling water channel 6 → thermostat valve 7 → third cooling water channel 8 → mechanical water pump 10 A circulation circuit through which cooling water flows in order is established.

  In this case, since the relatively high-temperature cooling water that has flowed out of the internal combustion engine 1 flows through the radiator 5, the heat of the cooling water is radiated by the radiator 5. As a result, since the cooling water having a relatively low temperature after radiating heat from the radiator 5 flows into the internal combustion engine 1, the internal combustion engine 1 is cooled by the cooling water, thereby preventing the internal combustion engine 1 from being overheated.

  Next, when the heater switch 21 is switched from OFF to ON while the internal combustion engine 1 is in an operating state, the ECU 20 maintains the electric water pump 14 in a stopped state, shuts off the first bypass passage 15 and In order to connect the 6 heater hose 11f and the 7th heater hose 11g, the first flow path switching valve 17 is controlled, the 2nd heater hose 11b is shut off, and the 1st heater hose 11a and the 2nd bypass passage 16 are connected. The second flow path switching valve 18 is controlled, and further, drive power is supplied to the heater blower 120 to operate the heater blower 120.

In this case, since only the mechanical water pump 10 operates without operating the electric water pump 14, as shown in FIG. 5, the mechanical water pump 10 → the block side cooling water channel 2b → the head side cooling water channel 2a → the first At the same time as the first circulation circuit in which the cooling water flows in the order of the cooling water passage 4 → the radiator 5 → the second cooling water passage 6 → the thermostat valve 7 → the third cooling water passage 8 → the mechanical water pump 10, the mechanical water pump 10 → Block side cooling water passage 2b → Head side cooling water passage 2a → first heater hose 11a → second flow path switching valve 18 → second bypass passage 16 → 6th heater hose 11f → first flow path switching valve 17 → first 7th heater hose 11g → heater core 12 → 8th heater hose 11h → 3rd cooling water channel 8 → mechanical water pump 10 Circulation circuit is established of.

  When the second circulation circuit is established as described above, the high-temperature cooling water that has flowed out of the internal combustion engine 1 flows into the first heater hose 11a, the second flow path switching valve 18, the second bypass passage 16, and the sixth heater hose. 11f, the first flow path switching valve 17, and the seventh heater hose 11g, it flows into the heater core 12, so that heat exchange is performed between the cooling water and the heating air in the heater core 12. That is, the heat of the cooling water is transmitted to the heating air in the heater core 12, and the heating air is warmed. Heating air heated in the heater core 12 is pumped into the passenger compartment by the heater blower 120.

  At that time, since the high-temperature cooling water flowing out from the internal combustion engine 1 can reach the heater core 12 directly without going through the heat storage container 13 or the like, the cooling water in the path from the internal combustion engine 1 to the heater core 12 is unnecessary. Heat dissipation is suppressed. As a result, the heat transferred from the internal combustion engine 1 to the cooling water is efficiently transferred to the heating air.

  Next, a method for storing high-temperature cooling water in the heat storage container 13 will be described. As a method of storing the high-temperature cooling water in the heat storage container 13, a method of storing the internal combustion engine 1 when it is in an operating state and a method of storing the internal combustion engine 1 immediately after the operation is stopped can be considered.

  First, when the high-temperature cooling water is stored in the heat storage container 13 when the internal combustion engine 1 is in an operating state, the ECU 20 maintains the electric water pump 14 in a stopped state, shuts off the sixth heater hose 11f and The first flow path switching valve 17 is controlled to connect the first bypass passage 15 and the seventh heater hose 11g, the second heater hose 11b is shut off, and the first heater hose 11a and the second bypass passage 16 are connected. Therefore, the second flow path switching valve 18 is controlled.

  In this case, since the electric water pump 14 does not operate and only the mechanical water pump 10 operates, as shown in FIG. 6, the mechanical water pump 10 → the block side cooling water channel 2b → the head side cooling water channel 2a → first At the same time as the first circulation circuit in which the cooling water flows in the order of the cooling water passage 4 → the radiator 5 → the second cooling water passage 6 → the thermostat valve 7 → the third cooling water passage 8 → the mechanical water pump 10, the mechanical water pump 10 → Block side cooling water passage 2b → Head side cooling water passage 2a → first heater hose 11a → second flow path switching valve 18 → second bypass passage 16 → fifth heater hose 11e → electric water pump 14 → fourth heater hose 11d → heat storage container 13 → third heater hose 11c → first bypass passage 15 → first flow path switching valve 17 → seventh heater hose 1 g → heater core 12 → eighth heater hose 11h → third third circulation circuit sequentially with flowing cooling water of the cooling water channel 8 → the mechanical water pump 10 is established.

  When the third circulation circuit as described above is established, when the cooling water passes through the head side cooling water channel 2a and the block side cooling water channel 2b, the heat of the cylinder head 1a and the cylinder block 1b is transferred to the head side cooling water channel 2a and the block. Since it is transmitted to the cooling water through the wall surface of the side cooling water channel 2b, the cooling water flowing out from the head side cooling water channel 2a becomes a high-temperature cooling water having a large amount of heat.

The high-temperature cooling water that has flowed out of the head-side cooling water channel 2a is supplied from the first heater hose 11a, the second channel switching valve 18, the second bypass passage 16, the fifth heater hose 11e, the electric water pump 14, and the fourth heater. It flows into the heat storage container 13 through the hose 11d. From the head side cooling water passage 2a, the first heater hose 11a, the second flow path switching valve 18, the second bypass passage 16, the fifth heater hose 11e, the electric water pump 14, and the fourth heater hose 11d are used to store the heat. The route to 13 corresponds to the second heat medium passage according to the present invention.

  When the high-temperature cooling water that has flowed out of the head-side cooling water channel 2 a flows into the heat storage container 13, the cooling water originally stored in the heat storage container 13 is discharged from the heat storage container 13 in place of it. When the high-temperature cooling water from the internal combustion engine 1 continues to flow into the heat storage container 13, all of the cooling water originally stored in the heat storage container 13 is discharged from the heat storage container 13. Only the high-temperature cooling water is stored.

  Here, in the third circulation circuit described above, the cooling water flowing out from the head side cooling water channel 2a can reach the heat storage container 13 directly without going through the heater core 12 or the like, and therefore the head side cooling water channel 2a. In the path from the heat storage container 13 to the heat storage container 13, unnecessary heat dissipation of the cooling water is suppressed, and the heat transmitted from the internal combustion engine 1 to the cooling water is efficiently stored in the heat storage container 13.

  Therefore, according to the third circulation circuit described above, the heat contained in the cooling water flowing out from the head side cooling water channel 2a can be stored in the heat storage container 13 without unnecessarily loss. Even when the amount of heat contained in the flowing cooling water is small, a sufficient amount of heat can be stored in the heat storage container 13.

  In addition, as a timing which complete | finishes the above storage processes, the time when all the cooling water in the heat storage container 13 was replaced is preferable, and as a method of determining such a time, all the cooling water in the heat storage container 13 is used. The time required for the replacement (hereinafter referred to as cooling water replacement time) is experimentally obtained in advance, and when the elapsed time from the start of the storage process reaches the cooling water replacement time, the heat storage container A method of determining that all the cooling water in 13 has been replaced can be exemplified.

  At that time, the cooling water replacement time is determined in consideration of the time required for the cooling water flowing out from the head-side cooling water channel 2a to reach the heat storage container 13 and the discharge amount per unit time of the mechanical water pump 10. It is preferred that However, since the discharge amount per unit time of the mechanical water pump 10 changes according to the engine speed, the relationship between the engine speed and the cooling water replacement time may be mapped in advance.

  On the other hand, the cooling water replacement time may be determined using parameters such as the temperature of the cooling water circulating in the internal combustion engine 1, the temperature of the cooling water in the heat storage container 13, and the outside air temperature. For example, the cooling water replacement time may be shortened as the temperature of the cooling water circulating through the internal combustion engine 1 is higher, the temperature of the cooling water in the heat storage container 13 is higher, and the outside air temperature is higher. The cooling water replacement time may be shortened as the difference between the temperature of the cooling water circulating through the cooling water and the temperature of the cooling water in the heat storage container 13 decreases (and the temperature of the cooling water in the heat storage container 13 increases). .

  Next, when the high-temperature cooling water is stored in the heat storage container 13 immediately after the operation of the internal combustion engine 1 is stopped, the mechanical water pump 10 is stopped, so that the ECU 20 operates the electric water pump 14 to operate it. While supplying driving electric power to the electric water pump 14, a circulation circuit similar to the third circulation circuit described in the description of FIG. 6 described above may be established.

As a method of storing the high-temperature cooling water in the heat storage container 13 immediately after the operation of the internal combustion engine 1 is stopped, a method of establishing a circulation circuit similar to the circulation circuit described in the description of FIG. In such a circulation circuit, the cooling water flowing out from the block-side cooling water passage 2b of the internal combustion engine 1 flows into the heat storage container 13 after passing through the heater core 12, so that the heater core 12
In this case, the heat of the cooling water is dissipated unnecessarily, and it is difficult to efficiently store heat. Therefore, in order to efficiently store the heat of the cooling water in the heat storage container 13, the method described in the explanation of FIG. 6 described above is optimal.

  As described above, in the internal combustion engine provided with the heat storage device according to the present embodiment, when the internal combustion engine 1 is preheated and when heat is stored in the heat storage container 13, the head side cooling water passage 2a and the heat storage container of the internal combustion engine 1 are stored. Therefore, it is possible to achieve efficient preheating and heat storage while suppressing unnecessary heat loss of the cooling water.

  Therefore, according to the internal combustion engine including the heat storage device according to the present embodiment, a sufficient amount of heat can be stored in the heat storage container 13 even when the amount of heat contained in the cooling water flowing out from the internal combustion engine 1 is small. In addition, the internal combustion engine 1 can be effectively preheated even when the amount of heat stored in the heat storage container 13 is small.

<Second Embodiment>
Next, 2nd Embodiment of the internal combustion engine provided with the thermal storage apparatus which concerns on this invention is described based on FIGS. Here, a configuration different from the above-described first embodiment will be described, and description of the same configuration will be omitted.

  The difference between the present embodiment and the first embodiment described above is that when the heat of the cooling water is stored in the heat storage container 13, the cooling water circulating through the internal combustion engine 1 is suitable for heat storage (hereinafter referred to as heat storage). The operation of the radiator fan 50 is prohibited until the temperature becomes higher than that (referred to as the adaptive temperature).

  In order to effectively reduce the amount of exhaust emission at the start of the internal combustion engine 1 and after the start, it is necessary to sufficiently raise the temperature of the wall surface of the intake port by preheating. For example, as shown in FIG. 7, as the intake port wall temperature (intake port wall temperature) decreases, the amount of exhaust emission increases. However, when the intake port wall temperature becomes higher than a predetermined temperature T, the exhaust emission amount increases. The amount drops below the desired target emission level.

  Therefore, when the amount of exhaust emission at the start of the internal combustion engine 1 and after the start is reduced below the target emission level, it is necessary to perform preheating so that the intake port wall temperature becomes higher than a predetermined temperature: T.

  Here, FIG. 8 shows the relationship between the elapsed time (leaving time) from the time when the cooling water is stored in the heat storage container 13 and the cooling water temperature in the heat storage container 13. The emission guarantee temperature shown in FIG. 8 is the minimum temperature of the heat storage hot water required to make the intake port wall temperature higher than a predetermined temperature: T, in other words, the target emission level described in the explanation of FIG. Is the minimum temperature of the heat storage hot water required to achieve the above.

  As shown in FIG. 8, the temperature of the cooling water stored in the heat storage container 13 gradually decreases as the standing time increases, but the rate of temperature decrease at that time becomes substantially constant. The time from when the cooling water is stored in the heat storage container 13 until the temperature of the cooling water drops below the emission guarantee temperature (hereinafter referred to as emission guarantee time) becomes longer as the temperature of the cooling water during storage increases. Become.

  Therefore, the higher the temperature of the cooling water during storage, the easier it is to suppress the exhaust emission below the target emission level even when the internal combustion engine 1 is started after being stopped for a long time.

In view of the above situation, it is preferable that the temperature of the cooling water to be stored in the heat storage container 13 is higher in order to make the amount of exhaust emission at the start of the internal combustion engine 1 and after the start less than the target emission level. I can say that.

  By the way, in a general water-cooled internal combustion engine, when the temperature of the cooling water reaches a preset fan operating temperature, the radiator fan 50 is operated, thereby improving the heat dissipation of the cooling water in the radiator 5 and thereby the internal combustion. Control is performed to keep the engine at an appropriate temperature.

  At that time, since the normal fan operating temperature is set lower than the above-described heat storage adaptive temperature, except for special cases such as when the internal combustion engine 1 is continuously operated at a high load or when the outside air temperature is very high, It can be said that there is little opportunity for the temperature of the cooling water to rise to the heat storage adaptive temperature.

  If the opportunity for the temperature of the cooling water to rise to the heat storage adaptation temperature decreases, the opportunity for storing the cooling water at the heat storage adaptation temperature or higher in the heat storage container 13 also decreases. In particular, when the operation of the internal combustion engine 1 is stopped in a short time, the cooling water does not rise to the heat storage adaptive temperature during the operation period of the internal combustion engine 1, and sufficient heat can be stored in the heat storage container 13. There is a high possibility of disappearing.

  As a result, when the internal combustion engine 1 is started next time, preheating such that the intake port wall temperature reaches a predetermined temperature: T cannot be realized, and the exhaust emission may exceed the target emission level.

  Therefore, in the internal combustion engine provided with the heat storage device according to the present embodiment, when the heat of the cooling water is stored in the heat storage container 13, the radiator fan until the temperature of the cooling water circulating through the internal combustion engine 1 becomes higher than the heat storage adaptive temperature. By prohibiting the operation of 50, the temperature of the cooling water is forcibly raised to the heat storage adaptive temperature in a short period of time.

  Specifically, when it is not necessary to store high-temperature cooling water in the heat storage container 13, the ECU 20 sets the radiator fan 50 when the output signal value of the water temperature sensor 19 reaches a preset normal fan operating temperature. However, when it is necessary to store high-temperature cooling water in the heat storage container 13, the output signal value of the water temperature sensor 19 is equal to or higher than the heat storage adaptive temperature, and the cooling water whose temperature is equal to or higher than the heat storage adaptive temperature is The operation of the radiator fan 50 is prohibited until it is stored in the heat storage container 13.

  However, if the temperature of the cooling water circulating through the internal combustion engine 1 rises excessively due to the prohibition of the operation of the radiator fan 50, the internal combustion engine 1 may be overheated. Therefore, the temperature of the cooling water when the operation of the radiator fan 50 is prohibited An upper limit value (hereinafter referred to as a fan operation prohibition upper limit temperature) is set, and when the output signal value of the water temperature sensor 19 reaches the fan operation prohibition upper limit temperature, the operation prohibition of the radiator fan 50 can be canceled. desirable.

  Hereinafter, an operation of the internal combustion engine provided with the heat storage device according to the present embodiment will be described. The ECU 20 executes a heat storage control routine as shown in FIG. 9 when storing the high-temperature cooling water in the heat storage container 13. This heat storage control routine is a routine stored in advance in a ROM built in the ECU 20, and is a routine that is repeatedly executed every predetermined time (for example, every time the crankshaft rotates by a predetermined angle).

  In the heat storage control routine, first in step S901, the ECU 20 accesses a failure determination flag storage area set in advance in the RAM, backup RAM, etc. of the ECU 20, and whether or not “0” is stored in the failure determination flag storage area. Is determined.

In the failure determination flag storage area, the heat storage system including the heat storage container 13, the electric water pump 14, the first flow path switching valve 17, the second flow path switching valve 18 and the like has failed due to separate failure determination control. This is an area where “1” is stored when it is determined that the heat storage system is present, and “0” is stored when it is determined that the heat storage system is normal.

  If it is determined in S901 that “1” is stored in the failure determination flag storage area, the ECU 20 determines that it is not necessary to store the high-temperature cooling water in the heat storage container 13, and proceeds to S910.

  In S910, the ECU 20 executes normal radiator fan control. That is, when the output signal of the water temperature sensor 19 (cooling water temperature): THW becomes equal to or higher than the normal fan operating temperature, the driving power is applied to the fan motor 50a to operate the radiator fan 50 for a certain period of time.

  On the other hand, if it is determined in S901 that “0” is stored in the failure determination flag storage area, the ECU 20 proceeds to S902, and the heat storage completion flag set in advance in the RAM, backup RAM, etc. of the ECU 20 The storage area is accessed, and it is determined whether or not “1” is stored in the heat storage completion flag storage area.

  The heat storage completion flag storage area described above is a storage area in which “1” is set when cooling water storage processing for the heat storage container 13 is completed and “0” is reset when the internal combustion engine 1 is started.

  If it is determined in S902 that “1” is stored in the heat storage completion flag storage area, the ECU 20 considers that the storage process of the cooling water for the heat storage container 13 has already been completed, and proceeds to S910. In S910, the ECU 20 executes normal radiator fan control.

  On the other hand, if it is determined in S902 that “0” is stored in the heat storage completion flag storage area, the ECU 20 considers that the storage process of the cooling water for the heat storage container 13 has not yet been completed, and proceeds to S903. .

  In S903, the ECU 20 reads the output signal (cooling water temperature): THW of the water temperature sensor 19.

  In step S904, the ECU 20 determines whether or not the cooling water temperature THW read in step S903 is equal to or higher than the fan operation prohibition upper limit temperature.

  If it is determined in S904 that the cooling water temperature THW is equal to or higher than the fan operation prohibition upper limit temperature, the ECU 20 proceeds to S905 and operates the radiator fan 50 to prevent the internal combustion engine 1 from overheating.

  Subsequently, the ECU 20 proceeds to S906 and executes heat storage heat treatment. Specifically, the ECU 20 maintains the electric water pump 14 in a stopped state, shuts off the sixth heater hose 11f, and makes the first bypass passage 15 and the seventh heater hose 11g conductive. 17 is further controlled by controlling the second flow path switching valve 18 so that the second heater hose 11b is shut off and the first heater hose 11a is connected to the second bypass passage 16. A circulation circuit as described in the description of FIG. 6 in this embodiment is established, and the high-temperature cooling water flowing out from the head-side cooling water channel 2 a is stored in the heat storage container 13.

  In this case, extremely high-temperature cooling water near the fan operation prohibition upper limit temperature is stored in the heat storage container 13.

  When the ECU 20 finishes executing the above heat storage heat treatment, the ECU 20 proceeds to S907, accesses the heat storage completion flag storage area described above, and rewrites the value of the heat storage completion flag storage area from “0” to “1”.

  If it is determined in S904 that the coolant temperature THW is lower than the fan operation prohibition upper limit temperature, the ECU 20 proceeds to S908 and prohibits the operation of the radiator fan 50.

  Subsequently, the ECU 20 proceeds to S909 and determines whether or not the cooling water temperature THW read in S903 is equal to or higher than the heat storage adaptive temperature.

  If it is determined in S909 that the cooling water temperature THW is equal to or higher than the heat storage adaptive temperature, the ECU 20 proceeds to S906 and executes the heat storage heat treatment as described above. In this case, cooling water having an extremely high temperature that is equal to or higher than the heat storage adaptive temperature is stored in the heat storage container 13.

  After completing the processing of S906, the ECU 20 proceeds to S907 and rewrites the value of the heat storage completion flag storage area from “0” to “1”.

  Thus, when the ECU 20 executes the heat storage control routine, the cooling water prohibiting means according to the present invention is realized and the internal combustion engine 1 is continuously operated at a high load or when the outside air temperature is very high. In other cases, it is possible to store cooling water having a temperature higher than the normal fan operating temperature in the heat storage container 13.

  Therefore, according to the internal combustion engine provided with the heat storage device according to the present embodiment, even when the internal combustion engine 1 is started after being stopped for a long time, the intake port wall temperature is set to the predetermined temperature: T by preheating. Therefore, the exhaust emission at the start and after the start can be suppressed below the target emission level.

  In addition, it is preferable that the heat storage control routine in the present embodiment is executed with the start completion of the internal combustion engine 1 as a trigger. This is because, when the operation of the radiator fan 50 is prohibited until the cooling water temperature becomes equal to or higher than the heat storage adaptive temperature from the start of the internal combustion engine 1, the temperature of the cooling water circulating through the internal combustion engine 1 is as shown in FIG. This is because, as compared with the case where the radiator fan 50 is operated at the normal fan operating temperature, the temperature increases to the heat storage adaptive temperature in a short time after the start.

<Third Embodiment>
Next, a third embodiment of the internal combustion engine provided with the heat storage device according to the present invention will be described with reference to FIGS. Here, a configuration different from the above-described second embodiment will be described, and description of the same configuration will be omitted.

  FIG. 11 is a diagram showing a coolant circulation system of a vehicle internal combustion engine to which the present invention is applied. The difference between the present embodiment and the second embodiment described above is that, in the second embodiment described above, when heat is stored in the heat storage container 13, the operation of the radiator fan 50 is prohibited to prevent the cooling water. In contrast to increasing the temperature to the heat storage adaptive temperature, in the present embodiment, when the heat is stored in the heat storage container 13, the temperature of the cooling water is increased to the heat storage adaptive temperature by reducing the flow rate of the cooling water flowing through the radiator 5. It is in.

As shown in FIG. 11, in the cooling water circulation system in the present embodiment, the flow rate of the cooling water flowing through the first cooling water channel 4 in the middle of the first cooling water channel 4 connecting the head side cooling water channel 2 a and the radiator 5. A flow rate adjusting valve 24 is provided for reducing the pressure.

  The flow rate adjusting valve 24 is driven by an actuator such as a step motor, and the actuator is controlled by the ECU 20.

  In the cooling water circulation system configured as described above, when it is not necessary to store the high-temperature cooling water in the heat storage container 13, the ECU 20 controls the opening degree of the flow rate adjusting valve 24 to the fully open position, whereby the internal combustion engine. The cooling water flowing out from the head-side cooling water channel 2a is circulated through the radiator 5, so that the temperature of the cooling water circulating through the head-side cooling water channel 2a and the block-side cooling water channel 2b is kept at an appropriate temperature.

  On the other hand, when it is necessary to store the high-temperature cooling water in the heat storage container 13, the flow rate of the cooling water flowing through the radiator 5 per unit time by the ECU 20 reducing the opening of the flow rate adjusting valve 24. Decrease.

  In this case, since the amount of heat radiated from the cooling water per unit time in the radiator 5 decreases, the rate of temperature decrease per unit time of the cooling water circulating in the head side cooling water channel 2a and the block side cooling water channel 2b decreases.

  Accordingly, when the opening degree of the flow rate adjusting valve 24 is reduced as described above, the temperature of the cooling water circulating in the head side cooling water channel 2a and the block side cooling water channel 2b of the internal combustion engine 1 is difficult to decrease, and at the same time The temperature of the cooling water easily rises due to the heat generated. As a result, the cooling water circulating through the head side cooling water passage 2a and the block side cooling water passage 2b of the internal combustion engine 1 quickly rises to the heat storage adaptive temperature.

  In addition, if the temperature of the cooling water circulating through the internal combustion engine 1 is excessively increased by decreasing the flow rate of the cooling water flowing through the radiator 5, the internal combustion engine 1 may be overheated. When an upper limit value of the cooling water temperature (hereinafter referred to as an "throttle control upper limit temperature") is set in order to reduce the flow rate of the water, and the output signal value of the water temperature sensor 19 reaches the above-described throttle control upper limit temperature, the flow rate It is desirable to return the opening of the regulating valve 24 to the fully open position.

  Hereinafter, an operation of the internal combustion engine provided with the heat storage device according to the present embodiment will be described. The ECU 20 executes a heat storage control routine as shown in FIG. 12 when storing the high-temperature cooling water in the heat storage container 13. This heat storage control routine is a routine stored in advance in a ROM built in the ECU 20, and is a routine that is repeatedly executed every predetermined time (for example, every time the crankshaft rotates by a predetermined angle).

  In the heat storage control routine, first in step S1201, the ECU 20 accesses a failure determination flag storage area set in advance in the RAM, backup RAM, etc. of the ECU 20, and whether or not “0” is stored in the failure determination flag storage area. Is determined.

  If it is determined in S1201 that “1” is stored in the failure determination flag storage area, the ECU 20 determines that it is not necessary to store the high-temperature cooling water in the heat storage container 13, and proceeds to S1210.

  In S1210, the ECU 20 controls the opening degree of the flow rate adjusting valve 24 to the fully open position, and sets the flow rate of the cooling water flowing through the radiator 5 to the normal flow rate.

On the other hand, if it is determined in S1201 that “0” is stored in the failure determination flag storage area, the ECU 20 proceeds to S1202, and a heat storage completion flag set in advance in the RAM, backup RAM, or the like of the ECU 20 The storage area is accessed, and it is determined whether or not “1” is stored in the heat storage completion flag storage area.

  If it is determined in S1202 that “1” is stored in the heat storage completion flag storage area, the ECU 20 considers that the storage process of the cooling water for the heat storage container 13 has already been completed, and proceeds to S1210. In S1210, the ECU 20 controls the opening degree of the flow rate adjustment valve 24 to the fully open position.

  On the other hand, if it is determined in S1202 that “0” is stored in the heat storage completion flag storage area, the ECU 20 regards the storage process of the cooling water for the heat storage container 13 as not yet completed, and the process proceeds to S1203. .

  In S1203, the ECU 20 reads the output signal (cooling water temperature): THW of the water temperature sensor 19.

  In S1204, the ECU 20 determines whether or not the coolant temperature THW read in S1203 is equal to or higher than the throttle control upper limit temperature.

  If it is determined in S1204 that the cooling water temperature THW is equal to or higher than the throttle control upper limit temperature, the ECU 20 proceeds to S1205 and sets the opening of the flow rate adjustment valve 24 to the fully open position to prevent the internal combustion engine 1 from overheating. To control.

  Subsequently, the ECU 20 proceeds to S1206 and executes heat storage heat treatment. Specifically, the ECU 20 maintains the electric water pump 14 in a stopped state, shuts off the sixth heater hose 11f, and makes the first bypass passage 15 and the seventh heater hose 11g conductive. 17 is further controlled by controlling the second flow path switching valve 18 so that the second heater hose 11b is shut off and the first heater hose 11a is connected to the second bypass passage 16. A circulation circuit as described in the description of FIG. 6 in this embodiment is established, and the high-temperature cooling water flowing out from the head-side cooling water channel 2 a is stored in the heat storage container 13.

  In this case, extremely high-temperature cooling water near the throttle control upper limit temperature is stored in the heat storage container 13.

  When the ECU 20 finishes executing the heat storage heat treatment as described above, the ECU 20 proceeds to S1207, accesses the heat storage completion flag storage area described above, and rewrites the value of the heat storage completion flag storage area from “0” to “1”.

  If it is determined in S1204 that the cooling water temperature THW is less than the throttle control upper limit temperature, the ECU 20 proceeds to S1208 and closes the opening of the flow rate adjustment valve 24 by a predetermined opening. The flow rate of the cooling water flowing through the radiator 5 is reduced per hour.

  Subsequently, the ECU 20 proceeds to S1209, and determines whether or not the cooling water temperature THW read in S1203 is equal to or higher than the heat storage adaptive temperature.

  If it is determined in S1209 that the cooling water temperature THW is equal to or higher than the heat storage adaptive temperature, the ECU 20 proceeds to S1206 and executes the heat storage heat treatment as described above. In this case, cooling water having an extremely high temperature that is equal to or higher than the heat storage adaptive temperature is stored in the heat storage container 13.

  After completing the process of S1206, the ECU 20 proceeds to S1207 and rewrites the value of the heat storage completion flag storage area from “0” to “1”.

  Thus, when the ECU 20 executes the heat storage control routine, the flow rate restricting means according to the present invention is realized, and a special case such as a case where the internal combustion engine 1 is continuously operated at a high load or the outside air temperature is very high. Even in cases other than the case, it is possible to store extremely high-temperature cooling water equal to or higher than the heat storage adaptive temperature in the heat storage container 13.

  Therefore, according to the internal combustion engine provided with the heat storage device according to the present embodiment, even when the internal combustion engine 1 is started after being stopped for a long time, the intake port wall temperature is set to the predetermined temperature: T by preheating. Therefore, the exhaust emission at the start and after the start can be suppressed below the target emission level.

  In addition, it is preferable that the heat storage control routine in the present embodiment is executed with the start completion of the internal combustion engine 1 as a trigger. This is because the temperature of the cooling water circulating through the internal combustion engine 1 becomes early after the start when the opening of the flow rate adjustment valve 24 is throttled from the start of the internal combustion engine 1 until the cooling water temperature becomes equal to or higher than the heat storage adaptive temperature. This is because the temperature will rise to the heat storage adaptive temperature. Further, in the present embodiment, when heat is stored in the heat storage container 13, the example in which the temperature of the cooling water is increased to the heat storage adaptive temperature by decreasing the flow rate of the cooling water flowing through the radiator 5, has been described. Instead of 7, when an electronically controlled thermostat valve whose valve opening temperature can be arbitrarily changed is used to store heat in the heat storage container 13, the valve opening temperature of the electronically controlled thermostat valve may be increased.

<Fourth embodiment>
Next, a fourth embodiment of the internal combustion engine provided with the heat storage device according to the present invention will be described with reference to FIGS. Here, a configuration different from the first embodiment described above will be described, and description of the same configuration will be omitted.

  The difference between the present embodiment and the first embodiment described above is that the heat storage heat treatment is performed a plurality of times during one operation period of the internal combustion engine 1 and the heat storage heat treatment performed for the first time after the engine is started. It is in the point that it is executed at an earlier time than usual.

  Here, the parameters for determining the execution timing of the heat storage heat treatment include the temperature of the cooling water circulating through the internal combustion engine 1, the elapsed time from the engine start, the vehicle travel distance from the engine start, and the engine load from the engine start. A cumulative value of (for example, accelerator opening or fuel injection amount) can be exemplified. In the present embodiment, a case where the temperature of the cooling water circulating through the internal combustion engine 1 is used as a parameter for determining the execution timing of the heat storage heat treatment will be described as an example.

  In this case, the first heat storage execution time after engine startup is executed when the temperature of the cooling water reaches the initial value of the heat storage execution temperature (hereinafter referred to as the heat storage execution temperature initial value). The initial value of the heat storage execution temperature at that time is set to a temperature lower than the average value of the cooling water temperature when the internal combustion engine 1 is in the normal operation state after warming up (hereinafter referred to as the warming water temperature).

  The above-described initial heat storage execution temperature may be a fixed value set in advance, but preferably, the outside air temperature at the start and the output signal value (water temperature at the start) of the water temperature sensor 19 at the start are used as parameters. A variable value to be determined.

When the initial value of the heat storage execution temperature is determined using the start-up outside air temperature and the start-up water temperature as parameters, as shown in FIG. 13, the heat storage execution temperature initial value increases as the start-up outside air temperature increases and the start-up water temperature increases. To be a high value. This is because the temperature of the cooling water rises in a shorter time as the start-up outside air temperature and the start-up water temperature become higher, so that the heat storage container 13 can supply higher-temperature cooling water without unnecessarily delaying the heat storage execution time. This is because it can be stored.

  Furthermore, the second and subsequent heat storage execution temperatures are determined by adding a predetermined temperature to the previous heat storage execution temperature. The addition amount at that time may be a fixed value set in advance, but is a variable value determined by using the current outside air temperature and the water temperature increase rate (water temperature increase per unit time) as parameters. Is preferred.

  When the above-described addition amount is determined using the outside air temperature and the water temperature increase rate as parameters, as shown in FIG. 14, the addition amount increases as the outside air temperature increases and the water temperature increase rate increases. This is because the cooling water temperature rises in a shorter time as the outside air temperature and the water temperature rise rate increase, so that the execution time of the heat storage heat treatment is excessively increased without unnecessarily delaying the heat storage heat treatment execution time. This is because it becomes possible to store the cooling water having a higher temperature in the heat storage container 13.

  The relationship between the initial value of the heat storage execution temperature, the start-up outside air temperature, and the start-up water temperature as shown in FIG. 13, and the relationship between the addition amount, the outside air temperature, and the water temperature increase rate as shown in FIG. You may make it map beforehand and memorize | store in ROM of ECU20.

  Hereinafter, an operation of the internal combustion engine provided with the heat storage device according to the present embodiment will be described. The ECU 20 executes a heat storage control routine as shown in FIG. 15 when storing the high-temperature cooling water in the heat storage container 13. This heat storage control routine is a routine stored in advance in a ROM built in the ECU 20, and is a routine that is repeatedly executed every predetermined time (for example, every time the crankshaft rotates by a predetermined angle).

  In the heat storage control routine, the ECU 20 first determines in step S1501 whether or not the internal combustion engine 1 is in a starting state.

  If it is determined in S1501 that the internal combustion engine 1 is in the starting state, the ECU 20 proceeds to S1502, accesses an initial flag storage area preset in the RAM of the ECU 20, and stores the initial flag storage area in the initial flag storage area. Reset “0”.

  The initial flag storage area is an area in which “1” is set when the first heat storage process after the engine is started and “0” is reset when the internal combustion engine 1 is started.

  In S1503, the ECU 20 reads an output signal (outdoor temperature at start) (not shown) and an output signal (startup temperature) from the water temperature sensor 19 (not shown).

  In S1504, the ECU 20 accesses the map shown in FIG. 13 described above using the starting outside air temperature and the starting water temperature read in S1503 as parameters, and the starting outside air temperature and starting time read in S1503. The initial value of the heat storage execution temperature corresponding to the water temperature is calculated. The calculated heat storage execution temperature initial value is stored in a predetermined area of the RAM.

  The ECU 20 proceeds to S1505 when it is determined in S1501 that the internal combustion engine 1 is not in the starting state, or when the processing of S1504 is completed.

  In S1505, the ECU 20 reads the output signal (cooling water temperature): THW of the water temperature sensor 19.

  In step S1506, the ECU 20 accesses the initial flag storage area of the RAM, and determines whether “0” is stored in the initial flag storage area.

  If it is determined in S1506 that “0” is stored in the initial flag storage area, the ECU 20 regards that the first heat storage after the engine start is not completed, and proceeds to S1507.

  In S1507, the heat storage execution temperature initial value calculated in S1504 is compared with the cooling water temperature THW read in S1505, and whether or not the cooling water temperature THW is equal to or higher than the heat storage execution temperature initial value. Determine.

  If it is determined in S1507 that the cooling water temperature: THW is less than the initial value of the heat storage execution temperature, the ECU 20 regards that it is not time to execute the heat storage heat treatment, and temporarily ends the execution of this routine.

  On the other hand, if it is determined in S1507 that the cooling water temperature THW is equal to or higher than the initial value of the heat storage execution temperature, the ECU 20 regards it as the time to execute the heat storage heat, and proceeds to S1508.

  In S1508, the ECU 20 executes the heat storage heat treatment for a predetermined time. Specifically, the ECU 20 maintains the electric water pump 14 in a stopped state, shuts off the sixth heater hose 11f, and makes the first bypass passage 15 and the seventh heater hose 11g conductive. 17 is further controlled by controlling the second flow path switching valve 18 so that the second heater hose 11b is shut off and the first heater hose 11a is connected to the second bypass passage 16. A circulation circuit as described in the explanation of FIG. 6 in this embodiment is established, and the cooling water flowing out from the head side cooling water channel 2 a is stored in the heat storage container 13.

  Note that the execution time of the heat storage heat treatment may be a variable value that is changed using the temperature of the cooling water circulating through the internal combustion engine 1, the temperature of the cooling water in the heat storage container 13, the outside air temperature, or the like as parameters. At that time, as the difference between the temperature of the cooling water circulating in the internal combustion engine 1 and the temperature of the cooling water in the heat storage container 13 is small and the temperature of the cooling water in the heat storage container 13 and the outside air temperature are high, the heat storage heat treatment is performed. It is preferable to shorten the execution time.

  When the ECU 20 finishes executing the heat storage process as described above, the ECU 20 proceeds to S1509 and rewrites the value of the initial flag storage area from “0” to “1”.

  Subsequently, in S1510, the ECU 20 sets the output signal (outside temperature) of the outside temperature sensor at the present time and the water temperature increase rate (amount of change of the output signal of the water temperature sensor 19 per unit time) as parameters in FIG. The map as shown is accessed, and an addition amount corresponding to the outside air temperature and the water temperature rise rate is calculated. Next, the ECU 20 calculates a new heat storage execution temperature by adding the added amount to the initial value of the heat storage execution temperature, and stores the newly calculated heat storage execution temperature in the RAM as the second heat storage execution temperature. The ECU 20 that has completed the processing of S1508 once ends the execution of this routine.

  On the other hand, if it is determined in S1506 that “0” is not stored in the initial flag storage area, that is, if it is determined that “1” is stored in the initial flag storage area, the ECU 20 It is considered that the first heat storage after the start has already been completed, and the process proceeds to S1511.

  In S1511, the ECU 20 compares the cooling water temperature: THW read in S1505 with the heat storage execution temperature stored in the RAM, and determines whether the cooling water temperature: THW is equal to or higher than the heat storage execution temperature. Determine.

  If it is determined in S1511 that the cooling water temperature THW is lower than the heat storage execution temperature, the ECU 20 once ends the execution of this routine.

  If it is determined in S1511 that the cooling water temperature THW is equal to or higher than the heat storage execution temperature, the ECU 20 proceeds to S1512 and executes the same heat storage heat treatment as S1508 described above.

  Subsequently, in S1513, the ECU 20 accesses the map as shown in FIG. 14 described above using the current outside air temperature and the water temperature rise rate as parameters, and calculates an addition amount corresponding to the outside air temperature and the water temperature rise rate. . Next, the ECU 20 adds the added amount to the heat storage execution temperature to calculate a new heat storage execution temperature, and stores the newly calculated heat storage execution temperature in the RAM as the next heat storage execution temperature.

  Thus, the ECU 20 repeatedly executes the heat storage control routine, whereby the storage processing means, the storage time setting means, and the storage temperature correction means according to the present invention are realized, and the operation of the internal combustion engine 1 is continued. As long as the heat storage heat treatment is repeatedly performed, the heat storage execution temperature is gradually increased and the amount of heat stored in the heat storage container 13 is gradually increased accordingly.

  Further, since the initial value of the heat storage execution temperature is set to a temperature lower than the average value of the cooling water temperature when the internal combustion engine 1 is in the normal operation state after the warm-up is completed, a relatively early time after the engine is started. This avoids a situation in which heat cannot be stored in the heat storage container 13 even when the operation of the internal combustion engine 1 is stopped in a relatively short time. Is possible.

  At that time, since the initial value of the heat storage execution temperature is set higher as the start-up outside air temperature and the start-up water temperature are higher, the first heat storage execution time is unnecessarily delayed under circumstances where the cooling water temperature is likely to rise. Without this, it becomes possible to store the cooling water having a higher temperature in the heat storage container 13.

  Furthermore, the update amount for determining the second and subsequent heat storage execution temperatures (addition amount added to the previous heat storage execution temperature) is set to increase as the outside air temperature and the water temperature increase rate increase, so the cooling water temperature is Cooling water at a higher temperature without unnecessarily delaying the execution time of the heat storage heat treatment in a situation where it is difficult to rise, and without excessively increasing the number of executions of the heat storage heat treatment in a situation where the cooling water temperature is likely to rise. Can be stored in the heat storage container 13.

  Therefore, according to the internal combustion engine including the heat storage device according to the present embodiment, it is possible to store the maximum amount of heat in the heat storage container 13 within a range commensurate with the operating conditions of the internal combustion engine.

  When the elapsed time from the engine start is used instead of the coolant temperature as a parameter for determining the execution timing of the heat storage heat treatment, the initial value is a high start-up outside air temperature as shown in FIG. The longer the start-up water temperature is, the longer the time is set, and the amount of update for determining the second and subsequent heat storage heat treatment execution times (the time to be added to the previous heat storage heat execution time) is as shown in FIG. It is sufficient to set more as the temperature is higher and the water temperature rise rate is higher.

Further, when the vehicle travel distance from the time of engine start is used instead of the coolant temperature as a parameter for determining the execution time of the heat storage heat treatment, the initial value is high at the start-up outside air temperature as shown in FIG. And as the water temperature at start-up becomes higher, the distance is set longer, and the update amount for determining the second and subsequent heat storage heat treatment execution timing (distance to be added to the previous heat storage heat execution time) is as shown in FIG. What is necessary is just to make it set so long that outside temperature is high and a water temperature rise rate becomes high.

  In addition, when a cumulative value of the engine load (for example, accelerator opening, fuel injection amount, etc.) from the time of engine start is used as a parameter for determining the execution time of the heat storage heat treatment, the initial value is As shown in FIG. 20, it is set to increase as the outside air temperature at the start is high and the water temperature at the start is high, and an update amount for determining the second and subsequent storage heat treatment execution timings (added to the previous accumulated engine load value) As shown in FIG. 21, the power value may be set to a larger value as the outside air temperature is higher and the water temperature rise rate is higher.

  Furthermore, in the present embodiment, an example in which a single parameter is used as a parameter for determining the execution timing of the heat storage heat treatment has been described. However, the coolant temperature, the elapsed time from the engine start, the vehicle running from the engine start The distance, the accumulated value of the engine load from when the engine is started, and the like may be appropriately combined, and the heat storage heat treatment may be performed when at least one of the plurality of parameters reaches the heat storage heat execution time.

<Fifth embodiment>
Next, a fifth embodiment of the internal combustion engine provided with the heat storage device according to the present invention will be described with reference to FIGS. Here, a configuration different from the first embodiment described above will be described, and description of the same configuration will be omitted.

  FIG. 22 is a view showing a cooling water circulation system of a vehicle internal combustion engine to which the present invention is applied in the present embodiment. The difference between the present embodiment and the first embodiment described above is based on the premise that heat storage heat treatment is performed a plurality of times during one operation period of the internal combustion engine 1, and the heat storage heat execution timing at that time is The temperature of the cooling water circulating through the internal combustion engine 1 is set at the time when the temperature of the cooling water in the heat storage container 13 becomes higher.

  Correspondingly, a container-side water temperature sensor 25 that outputs an electrical signal corresponding to the temperature of the cooling water stored in the heat storage container 13 is attached to the heat storage container 13, as shown in FIG. An output signal of the container-side water temperature sensor 25 is input to the ECU 20. Hereinafter, the water temperature sensor 19 attached to the first cooling water channel 4 is referred to as an engine-side water temperature sensor 19.

  In the cooling water circulation system configured as described above, when the ECU 20 performs heat storage, an output signal from the engine-side water temperature sensor 19 (engine-side water temperature) and an output signal from the container-side water temperature sensor 25 (container-side water temperature) Are stored every predetermined time, and the heat storage heat treatment is performed when the engine side water temperature becomes higher than the container side water temperature.

  However, if heat storage is performed simply by triggering that the engine-side water temperature is higher than the container-side water temperature, there is a possibility that the frequency of performing heat storage will increase excessively under circumstances where the cooling water temperature tends to rise. Therefore, the heat storage heat treatment that is performed for the first time after the engine is started is performed on the condition that the engine side water temperature is higher than the container side water temperature, and the engine side water temperature is changed to the container side water temperature for the second and subsequent heat storage heat treatments. On the other hand, it is preferable that the process is executed on condition that the temperature is higher than a predetermined temperature (hereinafter referred to as a heat storage execution temperature difference: α).

  The aforementioned heat storage execution temperature difference: α may be a fixed value set in advance, but is preferably a variable value determined by using the outside air temperature and the water temperature increase rate as parameters.

When the aforementioned heat storage execution temperature difference: α is determined using the outside air temperature and the water temperature increase rate as parameters, as shown in FIG. 23, the heat storage execution temperature difference: α as the outside air temperature decreases and the water temperature increase rate decreases. To be smaller. Note that the relationship between the heat storage execution temperature difference: α, the outside air temperature, and the water temperature rise rate as shown in FIG.

  Hereinafter, an operation of the internal combustion engine provided with the heat storage device according to the present embodiment will be described. The ECU 20 executes a heat storage control routine as shown in FIG. 24 when storing the high-temperature cooling water in the heat storage container 13. This heat storage control routine is a routine stored in advance in a ROM built in the ECU 20, and is a routine that is repeatedly executed every predetermined time (for example, every time the crankshaft rotates by a predetermined angle).

  In the heat storage control routine, the ECU 20 first determines in S2401 whether or not the internal combustion engine 1 is in a starting state.

  If it is determined in S2401 that the internal combustion engine 1 is in the starting state, the ECU 20 proceeds to S2402, accesses an initial flag storage area preset in the RAM of the ECU 20, and stores the initial flag storage area in the initial flag storage area. Reset 0 ”.

  The initial flag storage area is an area in which “1” is set when the first heat storage process after the engine is started and “0” is reset when the internal combustion engine 1 is started.

  The ECU 20 proceeds to S2403 when the execution of the process of S2402 is completed or when it is determined in S2401 that the internal combustion engine 1 is not in the starting state.

  In S2403, the ECU 20 inputs the output signal (engine-side water temperature) of the engine-side water temperature sensor 19 and the output signal (container-side water temperature) of the container-side water temperature sensor 25.

  In S2404, the ECU 20 accesses the initial flag storage area of the RAM, and determines whether or not “0” is stored in the initial flag storage area.

  If it is determined in S2404 that “0” is stored in the initial flag storage area, the ECU 20 determines that the first heat storage heat treatment has not yet been performed after the engine is started, and proceeds to S2405.

  In S2405, the ECU 20 compares the engine side water temperature input in S2403 with the container side water temperature, and determines whether or not the engine side water temperature is higher than the container side water temperature.

  If it is determined in S2405 that the engine-side water temperature is equal to or lower than the container-side water temperature, the ECU 20 once ends the execution of this routine.

  On the other hand, if it is determined in S2405 that the engine-side water temperature is higher than the container-side water temperature, the ECU 20 regards that it is time to execute the first heat storage heat, and proceeds to S2406.

In S2406, the ECU 20 keeps the electric water pump 14 in a stopped state, shuts off the sixth heater hose 11f, and sets the first flow path switching valve 17 to connect the first bypass passage 15 and the seventh heater hose 11g. The first embodiment described above is controlled by further controlling the second flow path switching valve 18 to shut off the second heater hose 11b and to connect the first heater hose 11a and the second bypass passage 16. 6 is established, and the cooling water flowing out from the head-side cooling water channel 2a is stored in the heat storage container 13.

  In S2407, the ECU 20 accesses the initial flag storage area of the RAM and rewrites the value of the initial flag storage area from “0” to “1”.

  In S2408, the ECU 20 accesses the map as shown in FIG. 23 described above, and calculates the heat storage execution temperature difference: α corresponding to the current outside air temperature and the water temperature rise rate. ECU20 memorize | stores the said thermal storage execution temperature difference: (alpha) in RAM, and complete | finishes execution of this routine once.

  If it is determined in S2404 that “0” is not stored in the initial flag storage area, that is, if it is determined that “1” is stored in the initial flag storage area, the ECU 20 Since the first heat storage heat treatment has already been performed after the engine is started, the process proceeds to S2409.

  In S2409, the ECU 20 reads out the heat storage execution temperature difference: α from the RAM, and the value obtained by subtracting the container side water temperature from the engine side water temperature input in S2403 is equal to or greater than the heat storage execution temperature difference: α (engine side). It is determined whether or not water temperature minus water temperature on the container side ≧ α).

  When it is determined in S2409 that the value obtained by subtracting the container-side water temperature from the engine-side water temperature is less than the heat storage execution temperature difference: α, the ECU 20 once ends the execution of this routine.

  On the other hand, if it is determined in S2409 that the value obtained by subtracting the container-side water temperature from the engine-side water temperature is equal to or greater than the heat storage execution temperature difference: α, the ECU 20 proceeds to S2410 and is similar to S2406 described above. Perform heat storage.

  In S2411, the ECU 20 accesses the map as shown in FIG. 23 described above, and calculates the heat storage execution temperature difference: α corresponding to the current outside air temperature and the water temperature rise rate. ECU20 memorize | stores the said thermal storage execution temperature difference: (alpha) in RAM, and complete | finishes execution of this routine once.

  As described above, when the ECU 20 executes the heat storage control routine, the temperature comparison unit and the storage processing unit according to the present invention are realized.

  As described above, in the internal combustion engine provided with the heat storage device according to the present embodiment, the first heat storage heat treatment after the engine start is executed when it is determined that the engine-side water temperature is higher than the container-side water temperature. Even if the engine-side water temperature does not rise to a desired temperature range, the amount of heat stored in the heat storage container 13 can be increased.

  Furthermore, in the internal combustion engine provided with the heat storage device according to the present embodiment, the second and subsequent heat storage heat treatments after the engine start is performed every time the engine side water temperature becomes higher than the container side water temperature by a predetermined heat storage execution temperature difference or more. Therefore, as long as the operation of the internal combustion engine 1 is continued and the engine-side water temperature rises, the heat storage amount of the heat storage container 13 is gradually increased.

  Therefore, according to the internal combustion engine including the heat storage device according to the present embodiment, it is possible to store the maximum amount of heat in the heat storage container 13 within a range commensurate with the operating conditions of the internal combustion engine.

In the present embodiment, an example in which the heat storage control routine is executed when the internal combustion engine 1 is in an operating state has been described, but in addition to when the internal combustion engine 1 is in an operating state, immediately after the operation of the internal combustion engine 1 is stopped. The heat storage control routine may be executed only once. At that time, if the heat storage heat treatment is performed on condition that the engine side water temperature is higher than the container side water temperature immediately after the operation of the internal combustion engine 1 is stopped, the amount of heat stored in the heat storage container 13 can be further increased. .

<Sixth Embodiment>
Next, a sixth embodiment of the internal combustion engine provided with the heat storage device according to the present invention will be described with reference to FIGS. Here, a configuration different from the first embodiment described above will be described, and description of the same configuration will be omitted.

  The difference between the present embodiment and the first embodiment described above is based on the premise that heat storage heat treatment is performed a plurality of times during one operation period of the internal combustion engine 1, and the heat storage heat execution timing at that time is The temperature of the cooling water circulating through the internal combustion engine 1 is set at a time when it becomes higher than the temperature of the cooling water at the previous execution of the heat storage heat treatment.

  Specifically, the ECU 20 sets the output signal value of the water temperature sensor 19 at the time of executing heat storage as the previous cooling water temperature (hereinafter referred to as the previous cooling water temperature value), and operates the internal combustion engine 1 like a backup RAM or the like. Data is stored in a memory that can store data even after the stop, and after that, when the output signal value of the water temperature sensor 19 becomes higher than the previous value of the cooling water temperature, the heat storage process is executed again.

  However, if heat storage heat treatment is performed simply when the output signal value of the water temperature sensor 19 exceeds the previous cooling water temperature value, the frequency of heat storage heat treatment will increase excessively under circumstances where the cooling water temperature is likely to rise. Therefore, the heat storage heat treatment that is performed for the first time after the engine is started is executed on the condition that the output signal value of the water temperature sensor 19 exceeds the previous value of the cooling water temperature, and the second and subsequent heat storage heat treatments are performed. Is preferably executed on condition that the output signal value of the water temperature sensor 19 is higher than the previous value of the cooling water temperature by a predetermined temperature (hereinafter referred to as a heat storage execution temperature difference: β) or more.

  The above-described heat storage execution temperature difference: β may be a fixed value set in advance, but is preferably a variable value determined using the outside air temperature and the previous cooling water temperature value as parameters.

  When the aforementioned heat storage execution temperature difference: β is determined using the outside air temperature and the previous cooling water temperature value as parameters, as shown in FIG. 25, the heat storage execution is performed as the outside air temperature is higher and the previous cooling water temperature value is lower. The temperature difference: β is increased, and the lower the outside air temperature and the higher the previous value of the cooling water temperature, the smaller the heat storage execution temperature difference: β.

  This is because when the outside air temperature is high, the cooling water temperature is likely to rise. Under such circumstances, if the previous cooling water temperature value is low, the cooling water temperature rises to the cooling water temperature previous value or higher in a relatively short time. On the other hand, when the outside air temperature is low, it is difficult for the cooling water temperature to rise. Under such circumstances, if the previous cooling water value is high, it takes time for the cooling water temperature to rise above the previous cooling water temperature value. This is because of this.

  Hereinafter, an operation of the internal combustion engine provided with the heat storage device according to the present embodiment will be described. The ECU 20 executes a heat storage control routine as shown in FIG. 26 when storing the high-temperature cooling water in the heat storage container 13. This heat storage control routine is a routine stored in advance in a ROM built in the ECU 20, and is a routine that is repeatedly executed every predetermined time (for example, every time the crankshaft rotates by a predetermined angle).

  In the heat storage control routine, the ECU 20 first determines in S2601 whether or not the internal combustion engine 1 is in a starting state.

  If it is determined in S2601 that the internal combustion engine 1 is in the starting state, the ECU 20 proceeds to S2602, accesses an initial flag storage area preset in the RAM of the ECU 20, and stores the initial flag storage area in the initial flag storage area. Reset “0”.

  The initial flag storage area is an area in which “1” is set when the first heat storage process after the engine is started and “0” is reset when the internal combustion engine 1 is started.

  The ECU 20 proceeds to S2603 when the process of S2602 is completed or when it is determined in S2601 that the internal combustion engine 1 is not in the starting state.

  In S2603, the ECU 20 inputs an output signal (cooling water temperature): THW of the water temperature sensor 19.

  In step S2604, the ECU 20 accesses the initial flag storage area of the RAM, and determines whether “0” is stored in the initial flag storage area.

  If it is determined in S2604 that “0” is stored in the initial flag storage area, the ECU 20 regards that the first heat storage heat treatment has not yet been performed after the engine is started, and proceeds to S2605.

  In S2605, the ECU 20 reads the previous coolant temperature value: THWold from the backup RAM, and compares the previous coolant temperature value: THWold with the coolant temperature: THW input in S2603.

If it is determined in S2605 that the coolant temperature: THW is equal to or lower than the coolant temperature previous value: THWold, the ECU 20 once ends the execution of this routine.

On the other hand, if it is determined in S2605 that the coolant temperature: THW is higher than the coolant temperature previous value: THWold, the ECU 20 regards it as the time when the first heat storage heat treatment should be performed, and proceeds to S2606.

  In S2606, the ECU 20 keeps the electric water pump 14 in a stopped state, shuts off the sixth heater hose 11f, and connects the first flow path switching valve 17 to connect the first bypass passage 15 and the seventh heater hose 11g. The first embodiment described above is controlled by further controlling the second flow path switching valve 18 to shut off the second heater hose 11b and to connect the first heater hose 11a and the second bypass passage 16. 6 is established, and the cooling water flowing out from the head-side cooling water channel 2a is stored in the heat storage container 13.

  In step S2607, the ECU 20 accesses the initial flag storage area of the RAM and rewrites the value of the initial flag storage area from “0” to “1”.

In S2608, the ECU 20 updates the previous value of the cooling water temperature in the backup RAM: THWold with the cooling water temperature: THW input in S2603, and temporarily ends the execution of this routine.

If it is determined in S2604 that “0” is not stored in the initial flag storage area, that is, if it is determined that “1” is stored in the initial flag storage area, the ECU 20 Assumes that the first heat storage heat treatment has already been performed after the engine is started, and proceeds to S2609.

In S2609, the ECU 20 reads the previous coolant temperature value: THWold from the backup RAM. Next, the ECU 20 accesses the map as shown in FIG.
A heat storage execution temperature difference: β corresponding to the cooling water temperature previous value: THWold and the current outside air temperature is calculated.

In S2610, the ECU 20 obtains a value obtained by subtracting the previous coolant temperature value: THWold from the coolant temperature: THW input in S2603, which is equal to or greater than the heat storage execution temperature difference: β (T
Whether or not HW−THWold ≧ β) is determined.

When it is determined in S2610 that the value obtained by subtracting the coolant temperature previous value: THWold from the coolant temperature: THW is less than the heat storage execution temperature difference: β, the ECU 20 once executes this routine. finish.

On the other hand, in S2610, from the cooling water temperature: THW to the previous cooling water temperature value: THWold.
When it is determined that the value obtained by subtracting is greater than or equal to the heat storage execution temperature difference: β, the ECU 20 proceeds to S2611, and executes the same heat storage heat treatment as in S2606 described above.

In S2612, the ECU 20 updates the previous value of the cooling water temperature of the backup RAM: THWold with the cooling water temperature: THW input in S2603, and ends the execution of this routine.

  Thus, when the ECU 20 executes the heat storage control routine, the storage processing means and the control means according to the present invention are realized.

As described above, in the internal combustion engine provided with the heat storage device according to the present embodiment, the first heat storage heat treatment after engine startup is determined that the coolant temperature: THW is higher than the coolant temperature previous value: THWold. Since it is executed at the time, it is possible to increase the heat storage amount of the heat storage container 13 even when the engine side water temperature does not rise to a desired temperature range.

Further, in the internal combustion engine equipped with the heat storage device according to the present embodiment, the heat storage heat treatment for the second and subsequent times after the engine is started is performed with a predetermined heat storage compared with the cooling water temperature: THW compared to the previous value of the cooling water temperature: THWold. Since it is executed whenever the temperature difference becomes higher than the temperature difference, as long as the operation of the internal combustion engine 1 is continued and the engine-side water temperature rises, the heat storage amount of the heat storage container 13 is gradually increased.

  Therefore, according to the internal combustion engine including the heat storage device according to the present embodiment, it is possible to store the maximum amount of heat in the heat storage container 13 within a range commensurate with the operating conditions of the internal combustion engine.

<Seventh embodiment>
Next, a seventh embodiment of the internal combustion engine provided with the heat storage device according to the present invention will be described with reference to FIG. Here, configurations different from those of the second to sixth embodiments described above will be described, and description of similar configurations will be omitted.

  In the above-described second to sixth embodiments, one or a plurality of heat storage heat treatments are performed during the operation period of the internal combustion engine 1, but in this embodiment, from the start of the internal combustion engine 1 to the operation stop. When the heat storage heat treatment has not been performed once during this period, in other words, when the execution condition of the heat storage heat treatment is not satisfied in the period from the start of the internal combustion engine 1 to the operation stop, The heat storage was performed.

  Specifically, the ECU 20 completes the heat storage described in the second to sixth embodiments when the operation of the internal combustion engine 1 is stopped, that is, when the ignition switch 22 is switched from on to off. The flag storage area or the initial flag storage area is accessed, and it is determined whether or not “1” is stored in the storage area.

  If it is determined that “1” is stored in the heat storage completion flag storage area or the initial flag storage area, the ECU 20 performs at least one heat storage heat treatment in the period from the start of the internal combustion engine 1 to the shutdown. When it is determined that “0” is stored in the heat storage completion flag storage area or the initial flag storage area, the heat storage heat treatment is performed in the period from the start of the internal combustion engine 1 to the shutdown. It is assumed that it has never been executed.

  When it is considered that the heat storage heat treatment has not been performed once in the period from the start of the internal combustion engine 1 to the operation stop (hereinafter referred to as the operation period), the ECU 20 operates the electric water pump 14 to The first flow path switching valve 17 is controlled to shut off the 6 heater hose 11f and to connect the first bypass passage 15 and the seventh heater hose 11g, further shut off the second heater hose 11b and the first heater hose 11a. By controlling the second flow path switching valve 18 so as to make the second bypass passage 16 conductive, the circulation circuit as described in the explanation of FIG. 6 in the first embodiment described above is established, and the head side The cooling water flowing out from the cooling water channel 2 a is stored in the heat storage container 13.

  When such heat storage control is performed, even if the operation period of the internal combustion engine 1 is extremely short and the execution condition of the heat storage heat treatment is not satisfied during the operation period, the maximum heat is supplied to the heat storage container 13. It can be stored.

  However, when the operation period of the internal combustion engine 1 is extremely short, the cooling water temperature (output signal of the water temperature sensor 19) when the operation of the internal combustion engine 1 is stopped is the cooling water temperature (container side water temperature) in the heat storage container 13. Therefore, the heat storage heat treatment may be executed only when the output signal of the water temperature sensor 19 is higher than the output signal of the container-side water temperature sensor 25, preferably a combustion type. Heat storage heat treatment may be performed after the cooling water is heated using an auxiliary heat source such as a heater.

  Hereinafter, an operation of the internal combustion engine provided with the heat storage device according to the present embodiment will be described. The ECU 20 executes a heat storage control routine as shown in FIG. 27 when storing the high-temperature cooling water in the heat storage container 13. This heat storage control routine is a routine stored in advance in a ROM built in the ECU 20, and is a routine that is repeatedly executed every predetermined time (for example, every time the crankshaft rotates by a predetermined angle).

  In the heat storage control routine, the ECU 20 first determines whether or not the operation of the internal combustion engine 1 has been stopped in S2701, in other words, whether or not the ignition switch 22 has been switched from on to off.

  If it is determined in S2701 that the operation of the internal combustion engine 1 is not stopped, the ECU 20 once ends the execution of this routine.

  On the other hand, if it is determined in S2701 that the operation of the internal combustion engine 1 has been stopped, the ECU 20 proceeds to S2702, accessing the heat storage completion flag storage area (or initial flag storage area) of the RAM, It is determined whether or not “0” is stored.

If it is determined in S2702 that “0” is not stored in the heat storage completion flag storage area (or the initial flag storage area), the ECU 20 once ends the execution of this routine.

  If it is determined in S2702 that “0” is stored in the heat storage completion flag storage area (or initial flag storage area), the ECU 20 proceeds to S2703.

  In S2703, ECU20 operates auxiliary heat sources, such as a combustion type heater, and performs a heating process of cooling water.

  In S2704, the ECU 20 inputs an output signal value (cooling water temperature): THW of the water temperature sensor 19.

  In S2705, the ECU 20 determines whether or not the cooling water temperature THW input in S2704 has been raised to the heat storage adaptive temperature or higher.

  If it is determined in S2705 that the coolant temperature: THW is lower than the heat storage adaptive temperature, the ECU 20 executes the processes of S2703 to S2705 described above again.

  If it is determined in S2705 that the cooling water temperature: THW is equal to or higher than the heat storage adaptive temperature, the ECU 20 proceeds to S2706, activates the electric water pump 14, shuts off the sixth heater hose 11f, and performs the first bypass. The first flow path switching valve 17 is controlled to connect the passage 15 and the seventh heater hose 11g, the second heater hose 11b is shut off, and the first heater hose 11a and the second bypass passage 16 are connected to each other. By controlling the second flow path switching valve 18, the cooling water flowing out from the head side cooling water channel 2 a is directly stored in the heat storage container 13.

  In S2707, the ECU 20 stops the operation of the auxiliary heat source, ends the execution of the cooling water heating process, and ends the execution of this routine.

  By executing the heat storage control routine in this manner, the ECU 20 stores the heat of the heat medium even when the operation period of the internal combustion engine 1 is short and the heat storage heat treatment is not performed once during the operation period. The opportunity to store in the device 13 is ensured, so that a desired amount of heat can be stored in the heat storage container 13.

<Eighth Embodiment>
Next, an eighth embodiment of an internal combustion engine provided with the heat storage device according to the present invention will be described with reference to FIGS. Here, a configuration different from the above-described second embodiment will be described, and description of the same configuration will be omitted.

  The difference between the present embodiment and the second embodiment described above is that, in the second embodiment described above, when heat is stored in the heat storage container 13, the operation of the radiator fan 50 is prohibited to prevent the cooling water. In contrast to increasing the temperature to the heat storage adaptive temperature, in the present embodiment, when the heat is stored in the heat storage container 13, the load of the internal combustion engine 1 is forcibly increased to increase the temperature of the cooling water to the heat storage adaptive temperature. is there.

  As shown in FIG. 28, an intake pipe 101 and a first exhaust pipe 104 are connected to the cylinder head 1a of the internal combustion engine 1 in the present embodiment.

The intake pipe 101 is connected to an intake duct 103 via an air cleaner box 102. After the air sucked from the intake duct 103 is removed by the air cleaner box 102, the intake air (not shown) of the cylinder head 1a is connected to the cylinder head 1a via the intake pipe 101. It is led to the port.

On the other hand, the first exhaust pipe 104 is connected to an exhaust purification catalyst 105 for purifying hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOx), etc. in the exhaust, and the exhaust purification catalyst. 105 is connected to the second exhaust pipe 106. The second exhaust pipe 106 is opened to the atmosphere downstream through a muffler (not shown).

  An exhaust throttle valve 107 is provided in the middle of the second exhaust pipe 106 to throttle (reduce) the flow rate of the exhaust gas flowing through the second exhaust pipe 106. The exhaust throttle valve 107 includes the exhaust throttle valve 107. An exhaust throttle actuator 108 for opening and closing the throttle valve 107 is attached.

  The exhaust throttle actuator 108 is composed of, for example, a stepper motor or the like, and can open and close the exhaust throttle valve 107 in accordance with a control signal from the ECU 20.

  In the internal combustion engine 1 configured as described above, when it is not necessary to store the high-temperature cooling water in the heat storage container 13, the ECU 20 uses the exhaust throttle valve 107 so that the opening degree of the exhaust throttle valve 107 becomes the normal target opening degree. Although the actuator 108 is controlled, when it becomes necessary to store the high-temperature cooling water in the heat storage container 13, the ECU 20 causes the exhaust throttle actuator 108 so that the opening degree of the exhaust throttle valve 107 is smaller than the normal target opening degree. To control.

  When the opening of the exhaust throttle valve 107 is made smaller than the normal target opening, in the exhaust passage upstream of the exhaust throttle valve 107 (the first exhaust pipe 104, the exhaust purification catalyst 105, the second exhaust pipe 106). The exhaust pressure increases, and the back pressure acting on the internal combustion engine 1 increases.

  When the back pressure acting on the internal combustion engine 1 rises, the pressure against the upward movement of the piston in the cylinder during the exhaust stroke increases, and the load on the internal combustion engine 1 increases. On the other hand, the ECU 20 increases the fuel injection amount (and the intake air amount) in order to increase the generated torque of the internal combustion engine 1. Therefore, the fuel amount (and the air amount) supplied to the fuel in the internal combustion engine 1 is increased. Will increase.

  In this case, the amount of heat generated when fuel burns in the internal combustion engine 1 increases, and the amount of heat generated by the internal combustion engine 1 increases accordingly. As a result, the amount of heat received from the internal combustion engine 1 by the cooling water circulating in the head side cooling water channel 2a and the block side cooling water channel 2b increases, and the temperature of the cooling water quickly rises to the heat storage adaptive temperature.

  Therefore, when the internal combustion engine 1 is forcibly operated at a high load when the cooling water is stored in the heat storage container 13, it becomes possible to store the cooling water at the heat storage adaptive temperature or higher in the heat storage container 13.

  Hereinafter, an operation of the internal combustion engine provided with the heat storage device according to the present embodiment will be described. The ECU 20 executes a heat storage control routine as shown in FIG. 29 when storing the high-temperature cooling water in the heat storage container 13. This heat storage control routine is a routine stored in advance in a ROM built in the ECU 20, and is a routine that is repeatedly executed every predetermined time (for example, every time the crankshaft rotates by a predetermined angle).

  In the heat storage control routine, first, in S2901, the ECU 20 accesses a failure determination flag storage area set in advance in the RAM, backup RAM, etc. of the ECU 20, and whether or not “0” is stored in the failure determination flag storage area. Is determined.

If it is determined in S2901 that “1” is stored in the failure determination flag storage area, the ECU 20 determines that it is not necessary to store the high-temperature cooling water in the heat storage container 13, and proceeds to S2911.

  In step S2911, the ECU 20 controls the exhaust throttle actuator 108 so that the opening degree of the exhaust throttle valve 107 becomes a normal opening degree, and sets the load of the internal combustion engine 1 as a normal load. ECU20 once complete | finishes execution of this routine, after finishing the process of S2911.

  On the other hand, if it is determined in S2901 that “0” is stored in the failure determination flag storage area, the ECU 20 proceeds to S2902, and the heat storage completion flag set in advance in the RAM, backup RAM, etc. of the ECU 20 The storage area is accessed, and it is determined whether or not “1” is stored in the heat storage completion flag storage area.

  If it is determined in S2902 that “1” is stored in the heat storage completion flag storage area, the ECU 20 considers that the storage process of the cooling water for the heat storage container 13 has already been completed, and proceeds to S2911. In step S2911, the ECU 20 controls the exhaust throttle actuator 108 so that the opening degree of the exhaust throttle valve 107 becomes a normal opening degree, and the execution of this routine ends.

  On the other hand, if it is determined in S2902 that “0” is stored in the heat storage completion flag storage area, the ECU 20 considers that the storage process of the cooling water for the heat storage container 13 has not yet been completed, and proceeds to S2903. .

  In S2903, the ECU 20 reads the output signal (first cooling water temperature): THW1 of the water temperature sensor 19.

  In S2904, the ECU 20 determines whether or not the first cooling water temperature THW1 read in S2903 is equal to or higher than the heat storage adaptive temperature.

If it is determined in S2904 that the first cooling water temperature THW1 is equal to or higher than the heat storage adaptive temperature, the ECU 20 proceeds to S2905 and exhausts the exhaust throttle valve 107 so that the opening degree of the exhaust throttle valve 107 becomes a normal opening degree. The throttle actuator 108 is controlled to return the load of the internal combustion engine 1 to a normal load.

  Subsequently, the ECU 20 proceeds to S2906 and executes heat storage heat treatment. Specifically, the ECU 20 maintains the electric water pump 14 in a stopped state, shuts off the sixth heater hose 11f, and makes the first bypass passage 15 and the seventh heater hose 11g conductive. 17 is further controlled by controlling the second flow path switching valve 18 so that the second heater hose 11b is shut off and the first heater hose 11a is connected to the second bypass passage 16. A circulation circuit as described in the description of FIG. 6 in this embodiment is established, and the high-temperature cooling water flowing out from the head-side cooling water channel 2 a is stored in the heat storage container 13.

  In this case, extremely high temperature cooling water equal to or higher than the heat storage adaptive temperature is stored in the heat storage container 13, and a large amount of heat is stored in the heat storage container 13.

  When the ECU 20 finishes executing the heat storage heat processing as described above, the ECU 20 proceeds to S2907, accesses the heat storage completion flag storage area described above, and rewrites the value of the heat storage completion flag storage area from “0” to “1”.

If it is determined in S2904 described above that the first cooling water temperature THW1 is lower than the heat storage adaptive temperature, the ECU 20 proceeds to S2908. In S2908, E
The CU 20 controls the exhaust throttle actuator 108 so that the opening of the exhaust throttle valve 107 is smaller than the normal opening by a predetermined amount: Δd.

  In this case, since the load of the internal combustion engine 1 increases and the amount of heat generated by the internal combustion engine 1 increases accordingly, it is transmitted from the internal combustion engine 1 to the cooling water in the head side cooling water passage 2a and the block side cooling water passage 2b. As a result, the temperature of the cooling water rises quickly.

  In step S2909, the ECU 20 reads the output signal value (second cooling water temperature): THW2 of the water temperature sensor 19 again.

  In S2910, the ECU 20 determines whether or not the second cooling water temperature THW2 read in S2909 is equal to or higher than the heat storage adaptive temperature.

If it is determined in S2910 that the second cooling water temperature THW2 is equal to or higher than the heat storage adaptive temperature, the ECU 20 executes heat storage heat treatment in S2906, and then in S2907 sets the value of the heat storage completion flag storage area to “ Rewrite from “0” to “1”.

On the other hand, if it is determined in S2910 that the second cooling water temperature THW2 is lower than the heat storage adaptive temperature, the ECU 20 once ends the execution of this routine.

  As described above, the ECU 20 executes the heat storage control routine as shown in FIG. 29, whereby the internal combustion engine 1 can be forcibly operated at a high load when the cooling water is stored in the heat storage container 13. Thus, the engine load increasing means is realized.

  As a result, under any operating condition of the internal combustion engine 1, it becomes possible to raise the temperature of the cooling water to a temperature equal to or higher than the heat storage adaptive temperature, and it is possible to store the cooling water having a temperature higher than the heat storage adaptive temperature in the heat storage container 13. It becomes.

  Therefore, according to the internal combustion engine provided with the heat storage device according to the present embodiment, even when the internal combustion engine 1 is started after being stopped for a long time, the intake port wall temperature is set to the predetermined temperature: T by preheating. Therefore, the exhaust emission at the start and after the start can be suppressed below the target emission level.

<Ninth embodiment>
Next, a ninth embodiment of the internal combustion engine provided with the heat storage device according to the present invention will be described with reference to FIGS. Here, a different configuration from the above-described eighth embodiment will be described, and the description of the same configuration will be omitted.

  The difference between the present embodiment and the above-described eighth embodiment is that, in the above-described eighth embodiment, when heat is stored in the heat storage container 13, the internal combustion is achieved by reducing the opening of the exhaust throttle valve 107. While the engine 1 is forcibly operated at a high load to raise the temperature of the cooling water to the heat storage adaptive temperature, in the present embodiment, when heat is stored in the heat storage container 13, the valve opening timing of the exhaust valve is advanced. Thus, the internal combustion engine 1 is forcibly operated at a high load to raise the temperature of the cooling water to the heat storage adaptive temperature.

  As shown in FIG. 30, in each cylinder 109 of the internal combustion engine 1 in the present embodiment, two intake valves 110 and two exhaust valves 111 are provided. Further, the internal combustion engine 1 is provided with a variable valve mechanism 112 that changes the opening / closing timing of the exhaust valve 111.

The variable valve mechanism 112 may be configured so that the opening / closing timing of the exhaust valve 111 can be changed in accordance with a control signal from the ECU 20. As such a variable valve mechanism 111, for example, rotation of an exhaust camshaft can be used. Configuration to change the phase, configuration to select any one of a plurality of cams formed on the exhaust camshaft, or by forming a three-dimensional cam on the exhaust camshaft and sliding the exhaust camshaft in the axial direction A configuration for selecting an arbitrary cam profile can be exemplified.

  In the internal combustion engine 1 configured as described above, when it is not necessary to store high-temperature cooling water in the heat storage container 13 (hereinafter referred to as normal time), the ECU 20 drives the exhaust valve 111 according to the normal target opening / closing timing. The variable valve mechanism 112 is controlled in order to achieve this.

  On the other hand, when it is necessary to store high-temperature cooling water in the heat storage container 13 (hereinafter referred to as heat storage time), the ECU 20 advances the valve opening timing of the exhaust valve 111 from the normal valve opening timing. The variable valve mechanism 112 is controlled.

Specifically, as shown in FIG. 31, the ECU 20 sets the valve opening timing CA1 of the exhaust valve 111 at the time immediately before the bottom dead center (BDC) of the exhaust stroke in normal times, while storing heat. Sometimes the valve opening timing of the exhaust valve 111: CA2 is set to a time when the valve opening timing at normal time: CA1 is advanced by a predetermined angle: ΔCA, that is, the middle of the expansion stroke.

  When the opening timing of the exhaust valve 111 is advanced to the middle of the expansion stroke, the combustion gas in the cylinder 109 flows out to the exhaust pipe 104 in the middle of the expansion stroke, so that the pressure in the cylinder 109 is expanded. It will drop rapidly during the process.

  Thus, when the pressure in the cylinder 109 rapidly decreases during the expansion stroke, the pressure (combustion pressure) generated by the combustion of the air-fuel mixture becomes difficult to be reflected in the kinetic energy of the piston. It will fall. As a result, it is necessary to increase the torque generated by the internal combustion engine 1, and the load on the internal combustion engine 1 increases accordingly.

  Therefore, when the cooling water is stored in the heat storage container 13, the load of the internal combustion engine 1 can be forcibly increased by advancing the valve opening timing of the exhaust valve 111 with respect to the normal valve opening timing. .

  Hereinafter, an operation of the internal combustion engine provided with the heat storage device according to the present embodiment will be described. The ECU 20 executes a heat storage control routine as shown in FIG. 32 when storing the high-temperature cooling water in the heat storage container 13. This heat storage control routine is a routine stored in advance in a ROM built in the ECU 20, and is a routine that is repeatedly executed every predetermined time (for example, every time the crankshaft rotates by a predetermined angle).

  In the heat storage control routine, first in step S3201, the ECU 20 accesses a failure determination flag storage area set in advance in the RAM, backup RAM, etc. of the ECU 20, and whether or not “0” is stored in the failure determination flag storage area. Is determined.

  If it is determined in S3201 that “1” is stored in the failure determination flag storage area, the ECU 20 determines that it is not necessary to store the high-temperature cooling water in the heat storage container 13, and proceeds to S3211.

  In step S3211, the ECU 20 controls the variable valve mechanism 112 so that the valve opening timing of the exhaust valve 111 is set to the normal valve opening timing, and sets the load of the internal combustion engine 1 to the normal load. ECU20 once complete | finishes execution of this routine, after finishing the process of S3211.

  On the other hand, if it is determined in S3201 that “0” is stored in the failure determination flag storage area, the ECU 20 proceeds to S3202, and a heat storage completion flag preset in the RAM, backup RAM, or the like of the ECU 20 is stored. The storage area is accessed, and it is determined whether or not “1” is stored in the heat storage completion flag storage area.

If it is determined in S3202 that “1” is stored in the heat storage completion flag storage area, the ECU 20 considers that the storage process of the cooling water for the heat storage container 13 has already been completed, and proceeds to S3211. In S3211, the ECU 20 controls the variable valve mechanism 112 so that the valve opening timing of the exhaust valve 111 is the normal valve opening timing: CA1, and ends the execution of this routine.

  On the other hand, if it is determined in S3202 that “0” is stored in the heat storage completion flag storage area, the ECU 20 regards the storage process of the cooling water for the heat storage container 13 as not yet completed, and the process proceeds to S3203. .

  In S3203, the ECU 20 reads the output signal (first cooling water temperature): THW1 of the water temperature sensor 19.

  In S3204, the ECU 20 determines whether or not the first cooling water temperature THW1 read in S3203 is equal to or higher than the heat storage adaptive temperature.

If it is determined in S3204 that the first coolant temperature: THW1 is equal to or higher than the heat storage adaptive temperature, the ECU 20 proceeds to S3205 and sets the valve opening timing of the exhaust valve 111 to the normal valve opening timing: CA1. Therefore, the variable valve mechanism 112 is controlled to return the load of the internal combustion engine 1 to a normal load.

  Subsequently, the ECU 20 proceeds to S3206 and executes heat storage heat treatment. Specifically, the ECU 20 maintains the electric water pump 14 in a stopped state, shuts off the sixth heater hose 11f, and makes the first bypass passage 15 and the seventh heater hose 11g conductive. 17 is further controlled by controlling the second flow path switching valve 18 so that the second heater hose 11b is shut off and the first heater hose 11a is connected to the second bypass passage 16. A circulation circuit as described in the description of FIG. 6 in this embodiment is established, and the high-temperature cooling water flowing out from the head-side cooling water channel 2 a is stored in the heat storage container 13.

  In this case, extremely high temperature cooling water equal to or higher than the heat storage adaptive temperature is stored in the heat storage container 13, and a large amount of heat is stored in the heat storage container 13.

  When the ECU 20 finishes executing the heat storage heat treatment as described above, the ECU 20 proceeds to S3207, accesses the heat storage completion flag storage area described above, and rewrites the value of the heat storage completion flag storage area from “0” to “1”. When the ECU 20 finishes executing the process of S3207, it temporarily ends the execution of this routine.

If it is determined in S3204 that the first coolant temperature THW1 is lower than the heat storage adaptive temperature, the ECU 20 proceeds to S3208. In S3208, the ECU 20 subtracts a predetermined angle: ΔCA from the normal valve opening timing: CA1 to calculate the valve opening timing during heat storage: CA2 (= CA1−ΔCA), and the calculated valve opening timing: The variable valve mechanism 112 is controlled according to CA2.

In this case, since the exhaust valve 111 opens in the middle of the expansion stroke, the load on the internal combustion engine 1 increases. In contrast, the ECU 20 increases the fuel injection amount (and the intake air amount) in order to increase the generated torque of the internal combustion engine 1, so that the amount of fuel provided for combustion in the internal combustion engine 1 increases, and the internal combustion engine accordingly. The heating value of the engine 1 increases.

  As a result, the amount of heat transferred from the internal combustion engine 1 to the cooling water in the head side cooling water channel 2a and the block side cooling water channel 2b increases, and the temperature of the cooling water rises quickly.

Here, returning to FIG. 32, when the ECU 20 finishes executing the process of S3208 described above, the output signal value (second cooling water temperature): THW2 of the water temperature sensor 19 is read again in S3209.

  In S3210, the ECU 20 determines whether or not the second cooling water temperature THW2 read in S3209 is equal to or higher than the heat storage adaptive temperature.

When it is determined in S3210 that the second cooling water temperature THW2 is equal to or higher than the heat storage adaptive temperature, the ECU 20 executes heat storage heat treatment in S3206, and then in S3207, sets the value of the heat storage completion flag storage area to “ Rewrite from “0” to “1”.

On the other hand, when it is determined in S3210 that the second cooling water temperature THW2 is lower than the heat storage adaptive temperature, the ECU 20 once ends the execution of this routine.

  As described above, the ECU 20 executes the heat storage control routine as shown in FIG. 32, whereby the internal combustion engine 1 can be forcibly operated at a high load when the cooling water is stored in the heat storage container 13. Thus, the engine load increasing means is realized.

  As a result, under any operating condition of the internal combustion engine 1, it becomes possible to raise the temperature of the cooling water to a temperature equal to or higher than the heat storage adaptive temperature, and it is possible to store the cooling water having a temperature higher than the heat storage adaptive temperature in the heat storage container 13. It becomes.

  Therefore, according to the internal combustion engine provided with the heat storage device according to the present embodiment, even when the internal combustion engine 1 is started after being stopped for a long time, the intake port wall temperature is set to the predetermined temperature: T by preheating. Therefore, the exhaust emission at the start and after the start can be suppressed below the target emission level.

  In the present embodiment, the example in which the load of the internal combustion engine 1 is increased by advancing the valve opening timing of the exhaust valve 111 during heat storage from the valve opening timing during normal time is described. However, the exhaust valve during heat storage is described. The load on the internal combustion engine 1 may be increased by retarding the valve opening timing 111 from the normal valve opening timing.

For example, as shown in FIG. 33, the exhaust valve 111 during normal operation: CA is set immediately before the exhaust stroke bottom dead center (BDC), whereas the exhaust valve during heat storage The valve opening time 111: CA4 may be set to a time delayed from the normal valve opening time: CA3 by a predetermined angle: ΔCA, that is, in the middle of the exhaust stroke.

  When the valve opening timing of the exhaust valve 111 is delayed to the middle of the exhaust stroke, the piston is compressed in the cylinder 109 during the period from the exhaust stroke bottom dead center (BDC) to the middle of the exhaust stroke. Therefore, the torque of the internal combustion engine 1 is reduced by the amount of compression work. As a result, it is necessary to increase the torque generated by the internal combustion engine 1, and thus the load on the internal combustion engine 1 increases.

Further, when the internal combustion engine 1 is provided with a variable valve mechanism that can change the opening / closing timing of the intake valve 110, as shown in FIG. 34, the opening timing of the intake valve 110 during heat storage: CA6 is normally set. Valve opening timing at time: By delaying from CA5, the pump loss of the internal combustion engine 1 may be increased, and thus the load of the internal combustion engine 1 may be increased.

<Tenth Embodiment>
Next, a tenth embodiment of an internal combustion engine provided with a heat storage device according to the present invention will be described with reference to FIGS. Here, a different configuration from the above-described eighth embodiment will be described, and the description of the same configuration will be omitted.

  The difference between the present embodiment and the above-described eighth embodiment is that, in the above-described eighth embodiment, when heat is stored in the heat storage container 13, the internal combustion is achieved by reducing the opening of the exhaust throttle valve 107. While the engine 1 is forcibly operated at a high load to raise the temperature of the cooling water to the heat storage adaptive temperature, in the present embodiment, when heat is stored in the heat storage container 13, the amount of power generated by the generator is increased. The point is that the internal combustion engine 1 is forcibly operated at a high load to raise the temperature of the cooling water to the heat storage adaptive temperature.

  As shown in FIG. 35, the internal combustion engine 1 according to the present embodiment is provided with a generator 140 that generates electric power by converting kinetic energy (rotational torque) of the engine output shaft (crankshaft) 130 into electric energy. Has been.

  Specifically, the generator 140 is fixed to the internal combustion engine 1, the crank pulley 131 attached to the crankshaft 130 of the internal combustion engine 1, and the generator pulley 142 attached to the rotor shaft 141 of the generator 140, Are connected via a belt 150.

  The generator 140 is provided with a regulator 143 that adjusts the amount of exciting current applied to the generator 140 from a battery (not shown). The regulator 143 adjusts the amount of exciting current according to a control signal from the ECU 20. It is configured.

  In the generator 140 described above, when the internal combustion engine 1 is in an operating state, part of the rotational torque of the crankshaft 130 is transmitted to the rotor shaft 141 via the crank pulley 131 → the belt 150 → the generator pulley 142, As a result, the rotor shaft 141 is rotated.

  At that time, when the regulator 143 applies an excitation current from the battery to the generator 140, an AC electromotive force is induced in the generator 140, and the AC power is rectified to DC power and output. In addition, the electric power output from the generator 140 is supplied to the electric load of a battery or a vehicle.

  In the internal combustion engine 1 configured as described above, the ECU 20 does not need to store the high-temperature cooling water in the heat storage container 13 (hereinafter referred to as normal time), and the excitation current applied from the battery to the generator 140. The regulator 143 is controlled so that the amount becomes a normal current amount.

  On the other hand, when it is necessary to store high-temperature cooling water in the heat storage container 13 (hereinafter referred to as heat storage), the ECU 20 increases the amount of excitation current applied from the battery to the generator 140 from the normal amount of current. The regulator 143 is controlled to make this happen.

When the amount of exciting current applied to the generator 140 is increased from the normal amount of current, the amount of kinetic energy converted into electric energy in the generator 140 increases, that is, the rotor shaft of the generator 140. Since the torque required to rotate 141 increases, it is necessary to increase the torque generated by the internal combustion engine 1, and thus the load on the internal combustion engine 1 increases.

  Therefore, when storing the cooling water in the heat storage container 13, the load of the internal combustion engine 1 can be forcibly increased by increasing the amount of excitation current applied to the generator 140 from the normal time.

  Hereinafter, an operation of the internal combustion engine provided with the heat storage device according to the present embodiment will be described. The ECU 20 executes a heat storage control routine as shown in FIG. 36 when storing the high-temperature cooling water in the heat storage container 13. This heat storage control routine is a routine stored in advance in a ROM built in the ECU 20, and is a routine that is repeatedly executed every predetermined time (for example, every time the crankshaft rotates by a predetermined angle).

  In the heat storage control routine, the ECU 20 first accesses a failure determination flag storage area set in advance in the RAM, backup RAM, etc. of the ECU 20 in S3601, and whether or not “0” is stored in the failure determination flag storage area. Is determined.

  If it is determined in S3601 that “1” is stored in the failure determination flag storage area, the ECU 20 determines that it is not necessary to store the high-temperature cooling water in the heat storage container 13, and proceeds to S3611.

  In step S3611, the ECU 20 controls the regulator 143 so that the amount of exciting current applied from the battery to the generator 140 becomes a normal amount of current, and temporarily ends the execution of this routine. In this case, since the amount of kinetic energy converted into electric energy in the generator 140 is a normal amount, the load of the internal combustion engine 1 is also a normal load.

  On the other hand, if it is determined in S3601 that “0” is stored in the failure determination flag storage area, the ECU 20 proceeds to S3602, and a heat storage completion flag set in advance in the RAM, backup RAM, etc. of the ECU 20 The storage area is accessed, and it is determined whether or not “1” is stored in the heat storage completion flag storage area.

  If it is determined in S3602 that “1” is stored in the heat storage completion flag storage area, the ECU 20 regards that the storage process of the cooling water for the heat storage container 13 has already been completed, and the process proceeds to S3611. In step S3611, the ECU 20 controls the regulator 143 so that the amount of excitation current applied from the battery to the generator 140 is a normal amount of current, and ends the execution of this routine.

  If it is determined in S3602 that “0” is stored in the heat storage completion flag storage area, the ECU 20 determines that the cooling water storage process for the heat storage container 13 has not yet been completed, and proceeds to S3603.

  In S3603, the ECU 20 reads the output signal (first cooling water temperature): THW1 of the water temperature sensor 19.

  In S3604, the ECU 20 determines whether or not the first cooling water temperature THW1 read in S3603 is equal to or higher than the heat storage adaptive temperature.

If it is determined in S3604 that the first cooling water temperature THW1 is equal to or higher than the heat storage adaptive temperature, the ECU 20 proceeds to S3605, and the amount of excitation current applied from the battery to the generator 140 is set to a normal current. The regulator 143 is controlled so that the amount becomes constant, and the load of the internal combustion engine 1 is returned to the normal load.

  Subsequently, the ECU 20 proceeds to S3606 and executes heat storage heat treatment. Specifically, the ECU 20 maintains the electric water pump 14 in a stopped state, shuts off the sixth heater hose 11f, and makes the first bypass passage 15 and the seventh heater hose 11g conductive. 17 is further controlled by controlling the second flow path switching valve 18 so that the second heater hose 11b is shut off and the first heater hose 11a is connected to the second bypass passage 16. A circulation circuit as described in the description of FIG. 6 in this embodiment is established, and the high-temperature cooling water flowing out from the head-side cooling water channel 2 a is stored in the heat storage container 13.

  In this case, extremely high temperature cooling water equal to or higher than the heat storage adaptive temperature is stored in the heat storage container 13, and a large amount of heat is stored in the heat storage container 13.

  When the ECU 20 finishes executing the heat storage heat treatment as described above, the ECU 20 proceeds to S3607, accesses the heat storage completion flag storage area described above, and rewrites the value of the heat storage completion flag storage area from “0” to “1”. ECU20 once complete | finishes execution of this routine, after finishing the process of said S3607.

If it is determined in S3604 that the first coolant temperature THW1 is lower than the heat storage adaptive temperature, the ECU 20 proceeds to S3608. In step S3608, the ECU 20 calculates a new excitation current amount (= normal current amount + A) by adding a predetermined amount: A to the normal excitation current amount. The ECU 20 controls the regulator 143 in accordance with the new exciting current amount (= normal current amount + A).

  In this case, since the amount of kinetic energy converted into electric energy in the generator 140 increases, the load on the internal combustion engine 1 also increases accordingly. In contrast, the ECU 20 increases the fuel injection amount (and the intake air amount) in order to increase the generated torque of the internal combustion engine 1, so that the amount of fuel provided for combustion in the internal combustion engine 1 increases, and the internal combustion engine accordingly. The heating value of the engine 1 increases.

  As a result, the amount of heat transferred from the internal combustion engine 1 to the cooling water in the head side cooling water channel 2a and the block side cooling water channel 2b increases, and the temperature of the cooling water rises quickly.

Here, returning to FIG. 36, when the ECU 20 finishes executing the process of S3608 described above, the output signal value (second cooling water temperature): THW2 of the water temperature sensor 19 is read again in S3609.

  In S3610, the ECU 20 determines whether or not the second coolant temperature THW2 read in S3609 is equal to or higher than the heat storage adaptive temperature.

If it is determined in S3610 that the second cooling water temperature THW2 is equal to or higher than the heat storage adaptive temperature, the ECU 20 executes heat storage heat treatment in S3606, and then in S3607 sets the value of the heat storage completion flag storage area to “ Rewrite from “0” to “1”.

On the other hand, when it is determined in S3610 that the second cooling water temperature THW2 is lower than the heat storage adaptive temperature, the ECU 20 once ends the execution of this routine.

  As described above, when the ECU 20 executes the heat storage control routine as shown in FIG. 36, the internal combustion engine 1 can be forcibly operated at a high load when the cooling water is stored in the heat storage container 13. Thus, the engine load increasing means is realized.

  As a result, under any operating condition of the internal combustion engine 1, it becomes possible to raise the temperature of the cooling water to a temperature equal to or higher than the heat storage adaptive temperature, and it is possible to store the cooling water having a temperature higher than the heat storage adaptive temperature in the heat storage container 13. It becomes.

  Therefore, according to the internal combustion engine provided with the heat storage device according to the present embodiment, even when the internal combustion engine 1 is started after being stopped for a long time, the intake port wall temperature is set to the predetermined temperature: T by preheating. Therefore, the exhaust emission at the start and after the start can be suppressed below the target emission level.

<Eleventh embodiment>
Next, an eleventh embodiment of an internal combustion engine provided with a heat storage device according to the present invention will be described with reference to FIGS. Here, a different configuration from the above-described eighth embodiment will be described, and the description of the same configuration will be omitted.

  The difference between the present embodiment and the above-described eighth embodiment is that, in the above-described eighth embodiment, when heat is stored in the heat storage container 13, the internal combustion is achieved by reducing the opening of the exhaust throttle valve 107. While the engine 1 is forcibly operated at a high load to raise the temperature of the cooling water to the heat storage adaptive temperature, in the present embodiment, when heat is stored in the heat storage container 13, the transmission gear ratio is increased to the speed increasing side. By prohibiting the change, the internal combustion engine 1 is forcibly operated at a high load to raise the temperature of the cooling water to the heat storage adaptive temperature.

  As shown in FIG. 37, the internal combustion engine 1 according to the present embodiment is connected to a transmission 160 that changes the rotational speed of the engine output shaft and transmits it to the propeller shaft 161. The propeller shaft 161 is connected to the drive axle via a final reduction gear or the like.

  This transmission 160 is an automatic transmission that automatically selects a gear ratio that is adapted to the operating state of the internal combustion engine 1 from a plurality of gear ratios, or a gear that is adapted to the operating state of the internal combustion engine 1 from a stepless gear ratio. A continuously variable transmission that automatically selects the ratio and is controlled by the ECU 20.

  In the internal combustion engine 1 configured as described above, when the ECU 20 does not need to store high-temperature cooling water in the heat storage container 13 (hereinafter referred to as normal time), the transmission 160 is allowed to allow the change of the gear ratio. To control. In this case, the transmission 160 can change the gear ratio according to the operating state of the internal combustion engine 1.

  On the other hand, when it is necessary to store high-temperature cooling water in the heat storage container 13 (hereinafter referred to as heat storage), the ECU 20 controls the transmission 160 to prohibit shifting to the speed increasing side of the gear ratio. . In this case, the transmission 160 is prohibited from changing the speed ratio to the speed increasing side regardless of the operating state of the internal combustion engine 1.

  When the transmission 160 is prohibited from changing the speed ratio to the speed increasing side, the engine speed of the internal combustion engine 1 increases as the vehicle speed increases, and thus the load on the internal combustion engine 1 increases. Become.

  Therefore, when the cooling water is stored in the heat storage container 13, the change of the transmission gear ratio in the transmission 160 to the speed increasing side is prohibited, so that the engine speed of the internal combustion engine 1 increases, and thus the internal combustion engine 1. It is possible to forcibly increase the load.

Hereinafter, an operation of the internal combustion engine provided with the heat storage device according to the present embodiment will be described. The ECU 20 executes a heat storage control routine as shown in FIG. 38 when storing the high-temperature cooling water in the heat storage container 13. This heat storage control routine is a routine stored in advance in a ROM built in the ECU 20, and is a routine that is repeatedly executed every predetermined time (for example, every time the crankshaft rotates by a predetermined angle).

  In the heat storage control routine, first, in S3801, the ECU 20 accesses a failure determination flag storage area set in advance in the RAM, backup RAM, etc. of the ECU 20, and whether or not “0” is stored in the failure determination flag storage area. Is determined.

  If it is determined in S3801 that “1” is stored in the failure determination flag storage area, the ECU 20 determines that it is not necessary to store the high-temperature cooling water in the heat storage container 13, and proceeds to S3811.

  In S3811, the ECU 20 controls the transmission 160 to permit the change of the gear ratio, and once ends the execution of this routine. In this case, since the transmission 160 can change the gear ratio according to the operating state of the internal combustion engine 1, the load on the internal combustion engine 1 is also a normal load.

  On the other hand, if it is determined in S3801 that “0” is stored in the failure determination flag storage area, the ECU 20 proceeds to S3802, and a heat storage completion flag set in advance in the RAM, backup RAM, or the like of the ECU 20 is stored. The storage area is accessed, and it is determined whether or not “1” is stored in the heat storage completion flag storage area.

  If it is determined in S3802 that “1” is stored in the heat storage completion flag storage area, the ECU 20 considers that the storage process of the cooling water for the heat storage container 13 has already been completed, and proceeds to S3811. In S3811, the ECU 20 controls the transmission 160 to permit the change of the gear ratio, and ends the execution of this routine.

  If it is determined in S3802 that “0” is stored in the heat storage completion flag storage area, the ECU 20 determines that the cooling water storage process for the heat storage container 13 has not yet been completed, and the process proceeds to S3803.

  In S3803, the ECU 20 reads the output signal (first cooling water temperature): THW1 of the water temperature sensor 19.

  In S3804, the ECU 20 determines whether or not the first cooling water temperature THW1 read in S3803 is equal to or higher than the heat storage adaptive temperature.

If it is determined in S3804 that the first cooling water temperature: THW1 is equal to or higher than the heat storage adaptive temperature, the ECU 20 proceeds to S3805 and controls the transmission 160 to permit the change of the gear ratio, and the internal combustion engine. Return the load of the engine 1 to the normal load.

  Subsequently, the ECU 20 proceeds to S3806 and executes heat storage heat treatment. Specifically, the ECU 20 maintains the electric water pump 14 in a stopped state, shuts off the sixth heater hose 11f, and makes the first bypass passage 15 and the seventh heater hose 11g conductive. 17 is further controlled by controlling the second flow path switching valve 18 so that the second heater hose 11b is shut off and the first heater hose 11a is connected to the second bypass passage 16. A circulation circuit as described in the description of FIG. 6 in this embodiment is established, and the high-temperature cooling water flowing out from the head-side cooling water channel 2 a is stored in the heat storage container 13.

  In this case, extremely high temperature cooling water equal to or higher than the heat storage adaptive temperature is stored in the heat storage container 13, and a large amount of heat is stored in the heat storage container 13.

  When the ECU 20 finishes executing the heat storage heat treatment as described above, the ECU 20 proceeds to S3807, accesses the heat storage completion flag storage area described above, and rewrites the value of the heat storage completion flag storage area from “0” to “1”. ECU20 once complete | finishes execution of this routine, after finishing the process of said S3807.

If it is determined in S3804 that the first cooling water temperature THW1 is lower than the heat storage adaptive temperature, the ECU 20 proceeds to S3808. In step S3808, the ECU 20 controls the transmission 160 to prohibit the change of the gear ratio on the speed increasing side.

  In this case, since the transmission 160 does not change the speed ratio to the speed increasing side, the engine speed of the internal combustion engine 1 is likely to increase, and the load on the internal combustion engine 1 is likely to increase. In contrast, the ECU 20 increases the fuel injection amount (and the intake air amount) in order to increase the generated torque of the internal combustion engine 1, so that the amount of fuel provided for combustion in the internal combustion engine 1 increases, and the internal combustion engine accordingly. The heating value of the engine 1 increases.

  As a result, the amount of heat transferred from the internal combustion engine 1 to the cooling water in the head side cooling water channel 2a and the block side cooling water channel 2b increases, and the temperature of the cooling water rises quickly.

Here, returning to FIG. 38, when the ECU 20 finishes executing the process of S3808 described above, the output signal value (second coolant temperature): THW2 of the water temperature sensor 19 is read again in S3809.

  In S3810, the ECU 20 determines whether or not the second coolant temperature THW2 read in S3809 is equal to or higher than the heat storage adaptive temperature.

If it is determined in S3810 that the second cooling water temperature THW2 is equal to or higher than the heat storage adaptive temperature, the ECU 20 performs heat storage heat treatment in S3806, and then in S3807 sets the value of the heat storage completion flag storage area to “ Rewrite from “0” to “1”.

On the other hand, when it is determined in S3810 that the second cooling water temperature THW2 is lower than the heat storage adaptive temperature, the ECU 20 once ends the execution of this routine.

  Thus, when the ECU 20 executes the heat storage control routine as shown in FIG. 38, the internal combustion engine 1 can be forcibly operated at a high load when the cooling water is stored in the heat storage container 13. Thus, the engine load increasing means is realized.

  As a result, under any operating condition of the internal combustion engine 1, it becomes possible to raise the temperature of the cooling water to a temperature equal to or higher than the heat storage adaptive temperature, and it is possible to store the cooling water having a temperature higher than the heat storage adaptive temperature in the heat storage container 13. It becomes.

  Therefore, according to the internal combustion engine provided with the heat storage device according to the present embodiment, even when the internal combustion engine 1 is started after being stopped for a long time, the intake port wall temperature is set to the predetermined temperature: T by preheating. Therefore, the exhaust emission at the start and after the start can be suppressed below the target emission level.

  In the present embodiment, the example in which the internal combustion engine 1 is forcibly operated at a high load by prohibiting the gear ratio of the transmission from being changed to the speed increasing side has been described. The internal combustion engine 1 may be forcibly operated at a high load by forcibly changing to the deceleration side.

<Twelfth embodiment>
Next, a twelfth embodiment of an internal combustion engine provided with a heat storage device according to the present invention will be described with reference to FIGS. Here, a different configuration from the above-described eighth embodiment will be described, and the description of the same configuration will be omitted.

  The difference between the present embodiment and the above-described eighth embodiment is that, in the above-described eighth embodiment, when heat is stored in the heat storage container 13, the internal combustion is achieved by reducing the opening of the exhaust throttle valve 107. While the engine 1 is forcibly operated at a high load to raise the temperature of the cooling water to the heat storage adaptive temperature, in the present embodiment, when heat is stored in the heat storage container 13, the internal combustion engine is operated by operating the braking device of the vehicle. The engine 1 is forcibly operated at a high load to raise the temperature of the cooling water to the heat storage adaptive temperature.

  As shown in FIG. 35, a vehicle 170 equipped with the internal combustion engine 1 according to the present embodiment is provided with four wheels 171, and a braking device 172 is attached to each wheel 171. The braking device 172 is connected to the actuator 173 through a hydraulic passage, and is configured to brake the rotation of the wheel 171 when the hydraulic pressure from the actuator 173 is applied.

  The actuator 173 is configured to switch between application and release of the hydraulic pressure to the braking device 172 according to a control signal from the ECU 20 and to adjust the hydraulic pressure to be applied to the braking device 172.

  In the vehicle 170 configured as described above, when the ECU 20 does not need to store the high-temperature cooling water in the heat storage container 13 (hereinafter referred to as normal time), the actuator 173 operates the brake device 172 as usual. To control.

  In this case, the actuator 173 switches between application and release of the hydraulic pressure to the actuator 173 and adjusts the height of the hydraulic pressure to be applied to the actuator 173 in accordance with a braking operation performed by the driver of the vehicle 170.

  On the other hand, when it is necessary to store high-temperature cooling water in the heat storage container 13 (hereinafter referred to as heat storage), the ECU 20 controls the actuator 173 to forcibly operate the braking device 172.

  In this case, since the braking device 172 forcibly brakes the rotation of the wheel 171, the torque required for the internal combustion engine 1 to rotationally drive the wheel 171 increases, thereby increasing the load on the internal combustion engine 1. become.

  Therefore, when the cooling water is stored in the heat storage container 13, the load on the internal combustion engine 1 can be increased by forcibly operating the braking device 172.

  Hereinafter, an operation of the internal combustion engine provided with the heat storage device according to the present embodiment will be described. The ECU 20 executes a heat storage control routine as shown in FIG. 40 when storing the high-temperature cooling water in the heat storage container 13. This heat storage control routine is a routine stored in advance in a ROM built in the ECU 20, and is a routine that is repeatedly executed every predetermined time (for example, every time the crankshaft rotates by a predetermined angle).

  In the heat storage control routine, first in step S4001, the ECU 20 accesses a failure determination flag storage area set in advance in the RAM, backup RAM, etc. of the ECU 20, and whether or not “0” is stored in the failure determination flag storage area. Is determined.

  If it is determined in S4001 that “1” is stored in the failure determination flag storage area, the ECU 20 determines that it is not necessary to store the high-temperature cooling water in the heat storage container 13, and proceeds to S4011.

  In S4011, the ECU 20 controls the actuator 173 to operate the braking device 172 as usual. In this case, the braking device 172 operates in accordance with the braking operation of the driver of the vehicle 170, so the load on the internal combustion engine 1 is also a normal load.

  On the other hand, if it is determined in S4001 that “0” is stored in the failure determination flag storage area, the ECU 20 proceeds to S4002, and a heat storage completion flag set in advance in the RAM, backup RAM, or the like of the ECU 20 The storage area is accessed, and it is determined whether or not “1” is stored in the heat storage completion flag storage area.

  If it is determined in S4002 that “1” is stored in the heat storage completion flag storage area, the ECU 20 considers that the storage process of the cooling water for the heat storage container 13 has already been completed, and proceeds to S4011. In S4011, the ECU 20 controls the actuator 173 to operate the braking device 172 as usual, and ends the execution of this routine.

  If it is determined in S4002 that “0” is stored in the heat storage completion flag storage area, the ECU 20 regards that the storage process of the cooling water for the heat storage container 13 has not yet been completed, and the process proceeds to S4003.

  In S4003, the ECU 20 reads the output signal (first cooling water temperature): THW1 of the water temperature sensor 19.

  In S4004, the ECU 20 determines whether or not the first cooling water temperature THW1 read in S4003 is equal to or higher than the heat storage adaptive temperature.

If it is determined in S4004 that the first cooling water temperature THW1 is equal to or higher than the heat storage adaptive temperature, the ECU 20 proceeds to S4005 and controls the actuator 173 to operate the brake device 172 as usual. Then, the load of the internal combustion engine 1 is returned to the normal load.

  Subsequently, the ECU 20 proceeds to S4006 and executes heat storage heat treatment. Specifically, the ECU 20 maintains the electric water pump 14 in a stopped state, shuts off the sixth heater hose 11f, and makes the first bypass passage 15 and the seventh heater hose 11g conductive. 17 is further controlled by controlling the second flow path switching valve 18 so that the second heater hose 11b is shut off and the first heater hose 11a is connected to the second bypass passage 16. A circulation circuit as described in the description of FIG. 6 in this embodiment is established, and the high-temperature cooling water flowing out from the head-side cooling water channel 2 a is stored in the heat storage container 13.

  In this case, extremely high temperature cooling water equal to or higher than the heat storage adaptive temperature is stored in the heat storage container 13, and a large amount of heat is stored in the heat storage container 13.

  When the ECU 20 finishes executing the heat storage heat processing as described above, the ECU 20 proceeds to S4007, accesses the heat storage completion flag storage area described above, and rewrites the value of the heat storage completion flag storage area from “0” to “1”. ECU20 once complete | finishes execution of this routine, after finishing the process of said S4007.

If it is determined in S4004 that the first cooling water temperature THW1 is lower than the heat storage adaptive temperature, the ECU 20 proceeds to S4008. In S4008, E
The CU 20 controls the actuator 173 to force the braking device 172 to operate.

  In this case, since the braking device 172 brakes the rotation of the wheel 171, the torque required for the internal combustion engine 1 to rotationally drive the wheel 171 increases, thereby increasing the load on the internal combustion engine 1. become. In contrast, the ECU 20 increases the fuel injection amount (and the intake air amount) in order to increase the generated torque of the internal combustion engine 1, so that the amount of fuel provided for combustion in the internal combustion engine 1 increases, and the internal combustion engine accordingly. The heating value of the engine 1 increases.

  As a result, the amount of heat transferred from the internal combustion engine 1 to the cooling water in the head side cooling water channel 2a and the block side cooling water channel 2b increases, and the temperature of the cooling water rises quickly.

Here, returning to FIG. 40, when the ECU 20 finishes executing the processing of S4008 described above, the output signal value (second cooling water temperature): THW2 of the water temperature sensor 19 is read again in S4009.

  In S4010, the ECU 20 determines whether or not the second coolant temperature THW2 read in S4009 is equal to or higher than the heat storage adaptive temperature.

If it is determined in S4010 that the second cooling water temperature THW2 is equal to or higher than the heat storage adaptive temperature, the ECU 20 performs heat storage heat treatment in S4006, and then in S4007 sets the value of the heat storage completion flag storage area to “ Rewrite from “0” to “1”.

On the other hand, when it is determined in S4010 that the second cooling water temperature THW2 is lower than the heat storage adaptive temperature, the ECU 20 once ends the execution of this routine.

  Thus, when the ECU 20 executes the heat storage control routine as shown in FIG. 38, the internal combustion engine 1 can be forcibly operated at a high load when the cooling water is stored in the heat storage container 13. Thus, the engine load increasing means is realized.

  As a result, under any operating condition of the internal combustion engine 1, it becomes possible to raise the temperature of the cooling water to a temperature equal to or higher than the heat storage adaptive temperature, and it is possible to store the cooling water having a temperature higher than the heat storage adaptive temperature in the heat storage container 13. It becomes.

  Therefore, according to the internal combustion engine provided with the heat storage device according to the present embodiment, even when the internal combustion engine 1 is started after being stopped for a long time, the intake port wall temperature is set to the predetermined temperature: T by preheating. Therefore, the exhaust emission at the start and after the start can be suppressed below the target emission level.

  In the cooling water circulation system in the first to twelfth embodiments described above, the flow direction of the cooling water by the electric water pump 14 and the flow direction of the cooling water by the mechanical water pump 10 are the same. It is possible to perform heat storage regardless of the operating state of the water pump 10, but the flow direction of the cooling water by the electric water pump 14 and the flow direction of the cooling water by the mechanical water pump 10 are reversed. Since the discharge pressure of the mechanical water pump 10 is higher than the discharge pressure of the electric water pump 14 under a situation where the engine speed is high, the heat storage cannot be performed.

  Therefore, in the cooling water circulation system in which the flow direction of the cooling water by the electric water pump 14 and the flow direction of the cooling water by the mechanical water pump 10 are reversed, the heat storage heat treatment is executed when the engine speed is equal to or lower than the predetermined speed. It is preferable.

It is a figure which shows schematic structure of the cooling water circulation system of the internal combustion engine for vehicles in 1st Embodiment. It is a figure which shows the flow of the cooling water in the case of preheating an internal combustion engine. It is a figure which shows the flow of the cooling water after an engine start. It is a figure which shows the flow of the cooling water after engine warm-up. It is a figure which shows the flow of the cooling water when a heater switch is ON. It is a figure which shows the flow of the cooling water in the case of storing cooling water in a thermal storage container. It is a figure which shows the relationship between the wall surface temperature of an intake port, and the amount of emission. It is a figure which shows the relationship between the water temperature in a thermal storage container, and leaving time. It is a flowchart which shows the heat storage control routine in 2nd Embodiment. It is a figure which shows the transition of the cooling water temperature in 2nd Embodiment. It is a figure which shows schematic structure of the cooling water circulation system of the internal combustion engine for vehicles in 3rd Embodiment. It is a flowchart which shows the heat storage control routine in 3rd Embodiment. It is a figure which shows the relationship between the heat storage execution temperature initial value, the starting outside air temperature, and the starting water temperature. It is a figure which shows the relationship between the temperature added to thermal storage execution temperature, external temperature, and water temperature rise rate. It is a flowchart figure which shows the heat storage control routine in 4th Embodiment. It is a figure which shows the relationship between the initial value of thermal storage execution time, the external temperature at the time of start, and the water temperature at the time of start. It is a figure which shows the relationship between time added to thermal storage execution time, external temperature, and water temperature rise speed. It is a figure which shows the relationship between the initial value of thermal storage execution distance, the external temperature at the time of start, and the water temperature at the time of start. It is a figure which shows the relationship between the distance added to thermal storage execution travel distance, external temperature, and water temperature rise speed. It is a figure which shows the relationship between the initial value of the engine load cumulative value which should perform heat storage heat processing, the external temperature at the time of start, and the water temperature at the time of start. It is a figure which shows the relationship between the update value of the engine load cumulative value which should perform thermal storage heat processing, outside temperature, and water temperature rise rate. It is a figure which shows schematic structure of the cooling water circulation system of the internal combustion engine for vehicles in 5th Embodiment. It is a figure which shows the relationship between the thermal storage execution temperature difference in 5th Embodiment, external temperature, and water temperature rise rate. It is a flowchart which shows the heat storage control routine in 5th Embodiment. It is a figure which shows the relationship between the heat storage execution temperature in 6th Embodiment, external temperature, and the cooling water temperature last value. It is a flowchart which shows the heat storage control routine in 6th Embodiment. It is a flowchart which shows the heat storage control routine in 7th Embodiment. It is a figure which shows schematic structure of the intake / exhaust system of the internal combustion engine in 8th Embodiment. It is a flowchart which shows the thermal storage control routine in 8th Embodiment. It is a figure which shows schematic structure of the internal combustion engine in 9th Embodiment. It is a figure (1) which shows the valve opening time of the exhaust valve in 9th Embodiment. It is a flowchart which shows the heat storage control routine in 9th Embodiment. It is a figure (2) which shows the valve opening time of the exhaust valve in 9th Embodiment. It is a figure which shows the valve opening time of the intake valve in 9th Embodiment. It is a figure which shows schematic structure of the internal combustion engine in 10th Embodiment. It is a flowchart which shows the heat storage control routine in 10th Embodiment. It is a figure which shows schematic structure of the internal combustion engine in 11th Embodiment. It is a flowchart which shows the thermal storage control routine in 11th Embodiment. It is a figure which shows schematic structure of the internal combustion engine in 12th Embodiment. It is a flowchart figure which shows the thermal storage control routine in 12th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine 1a ... Cylinder head 1b ... Cylinder block 2a ... Head side cooling water channel 2b ... Block side cooling water channel 5 ... Radiator 10 ... Mechanical water pump 13 ... Heat storage container 14 ... Electric water pump 17 ... First flow path switching valve 18 ... Second flow path switching valve 19 ... Water temperature sensor 19 (engine-side water temperature sensor)
20 ... ECU20
24 ... Flow rate adjusting valve 25 ... Container side water temperature sensor 50 ... Radiator fan 50a ... Fan motor 107 ... Exhaust throttle valve 108 ... Exhaust throttle actuator 111 ... Exhaust valve 112 ... Variable valve Mechanism 140 ·· Generator 143 · · Regulator 160 · · Transmission 170 · · Vehicle 171 · · Wheel 172 · · Braking device 173 · · Actuator

Claims (9)

A heat medium flow passage formed in the internal combustion engine and through which the heat medium flows;
  A heat accumulator that heats and stores part of the heat medium flowing through the heat medium flow passage and supplies the heat medium that has been kept warm to the heat medium flow passage to raise the temperature of the internal combustion engine;
  Engine load increasing means for increasing the load of the internal combustion engine when storing a high-temperature heat medium in the heat storage device;
An internal combustion engine provided with a heat storage device. An exhaust throttle valve that is provided in the exhaust passage of the internal combustion engine and throttles the flow rate of the exhaust gas flowing through the exhaust passage;
  The internal combustion engine with a heat storage device according to claim 1, wherein the engine load increasing means throttles the opening of the exhaust throttle valve when a high-temperature heat medium is stored in the heat storage device. A variable valve mechanism for changing the opening and closing timing of the exhaust valve of the internal combustion engine;
  2. The internal combustion engine having a heat storage device according to claim 1, wherein the engine load increasing means advances a valve opening timing of the exhaust valve when a high-temperature heat medium is stored in the heat storage device. . A variable valve mechanism for changing the opening and closing timing of the exhaust valve of the internal combustion engine;
  2. The internal combustion engine having a heat storage device according to claim 1, wherein the engine load increasing means retards a valve opening timing of the exhaust valve when a high-temperature heat medium is stored in the heat storage device. . A variable valve mechanism that changes the opening and closing timing of the intake valve of the internal combustion engine;
  2. The internal combustion engine having a heat storage device according to claim 1, wherein the engine load increasing means retards the valve opening timing of the intake valve when a high-temperature heat medium is stored in the heat storage device. . A generator for generating electricity using a part of the output of the internal combustion engine as a drive source;
  The internal combustion engine having a heat storage device according to claim 1, wherein the engine load increasing means increases the amount of power generated by the generator when a high-temperature heat medium is stored in the heat storage device. A braking mechanism for braking a vehicle equipped with the internal combustion engine;
  The internal combustion engine with a heat storage device according to claim 1, wherein the engine load increasing means operates the braking mechanism when storing a high-temperature heat medium in the heat storage device. Further comprising a transmission attached to the internal combustion engine,
  2. The heat storage according to claim 1, wherein the engine load increasing unit prohibits changing the transmission gear ratio to the speed increasing side when a high-temperature heat medium is stored in the heat storage device. Internal combustion engine provided with the device. Further comprising a transmission attached to the internal combustion engine,
  2. The internal combustion engine having a heat storage device according to claim 1, wherein the engine load increasing means changes a gear ratio of the transmission to a deceleration side when storing a high-temperature heat medium in the heat storage device. organ.

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