JP4665993B2 - Internal combustion engine equipped with a heat storage device - Google Patents

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 cooling water that circulates in an internal combustion engine, and a mechanism that circulates cooling water in the heat retaining tank to the internal combustion engine when the internal combustion engine is started. 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. and the heat medium passage, a passage switching means for alternatively conducting and the second communication passage and the first communication passage, may be so that with the.

  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 regenerated.

  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 regenerated.

  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 above-described 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 .

  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 equipped with the heat storage device according to the present invention, it is possible to secure an opportunity to store the heat medium in the heat storage device, and therefore the maximum amount of heat is stored regardless of the operating conditions of the internal combustion engine. Can be stored in 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 Reference Example>
First, with the first reference example of an internal combustion engine having a thermal storage device according to the present invention will be described with reference to FIGS. 1 to 6.

Figure 1 is a diagram illustrating a cooling water circulation system of the car dual engine. 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.

Hereinafter, a description of the operation of an internal combustion engine having a thermal storage device definitive in reference example this. 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 → third 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 will flow 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 stored in the heat storage container. 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 that has flowed out of 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 heat of the cooling water is unnecessarily radiated in the heater core 12. 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. 2 described above is optimal.

As described above, in the internal combustion engine provided with the heat storage device according to the present reference example, when the internal combustion engine 1 is preheated and when heat is stored in the heat storage container 13, the head side cooling water channel 2a and the heat storage container 13 of the internal combustion engine 1 are stored. Therefore, it is possible to realize 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 reference example, 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. As a result, 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 Reference Example>
Next, with the second reference example of an internal combustion engine having a thermal storage device according to the present invention will be described with reference to FIGS. 7 to 10. Here, a configuration different from the first reference example described above will be described, and description of the same configuration will be omitted.

Differences between the present embodiment and the first reference example described above, when storing the heat of the cooling water in the heat storage container 13, the temperature of the cooling water is suitable heat storage circulating through the internal combustion engine 1 (hereinafter, the heat storage adaptive temperature The operation of the radiator fan 50 is prohibited until it becomes higher.

  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 this reference example, when the heat of the cooling water is stored in the heat storage container 13, the radiator fan 50 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, 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.

The operation of the internal combustion engine provided with the heat storage device according to this reference example will be described below. 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 to shut off the second heater hose 11b and to connect the first heater hose 11a and the second bypass passage 16 to each other. It passed a circulation circuit as described in the description of Figure 6 which definitive example, to store the high-temperature cooling water flowing out from the head side cooling water passage 2a to 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”.

By thus ECU20 executes the regenerative control routine, higher than normal fan operation temperature except in the case or if the outside temperature is very high if such a special inner combustion engine 1 is a high-load operation in succession It becomes possible to store the cooling water of temperature in the heat storage container 13.

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

Incidentally, the heat storage control routine definitive in this reference example, it is preferable to be performed in the trigger start completion of the internal combustion engine 1. 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 reference example>
Next, with the third reference example of an internal combustion engine having a thermal storage device according to the present invention will be described with reference to FIGS. 11-12. Here, a configuration different from the above-described second reference example will be described, and description of the same configuration will be omitted.

Figure 11 is a diagram illustrating a cooling water circulation system of the car dual internal combustion engine in the present embodiment. Differences between the present embodiment and the second reference example described above, the temperature of the cooling water by prohibiting the operation of the radiator fan 50 when in the second reference example described above which stores heat in the heat storage container 13 In contrast to increasing the heat storage adaptive temperature, in this reference example, when storing heat 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. .

As shown in FIG. 11, the cooling water circulation system definitive the present embodiment, in the middle of the first cooling water passage 4 connecting the head-side cooling water passage 2a and the radiator 5, the flow rate of the cooling water flowing through the first cooling water passage 4 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.

The operation of the internal combustion engine provided with the heat storage device according to this reference example will be described below. 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, when 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 to shut off the second heater hose 11b and to connect the first heater hose 11a and the second bypass passage 16 to each other. It passed a circulation circuit as described in the description of Figure 6 which definitive example, to store the high-temperature cooling water flowing out from the head side cooling water passage 2a to the heat storage container 13.

In this case, an extremely high temperature cooling water of the aperture control upper limit temperature near neighbor is to be 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”.

By thus ECU20 executes the regenerative control routine, extremely even over the heat storage adaptive temperature except in the case or if the outside temperature is very high if such a special inner combustion engine 1 is a high-load operation in succession Hot cooling water can be stored in the heat storage container 13.

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

Incidentally, the heat storage control routine definitive in this reference example, it is preferable to be performed in the trigger start completion of the internal combustion engine 1. 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 this reference example, when heat is stored in the heat storage container 13, an 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 is 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 Reference Example>
Then, with the fourth reference example of an internal combustion engine having a thermal storage device according to the present invention will be described with reference to FIGS. 13 to 21. Here, a configuration different from the first reference example described above will be described, and description of the same configuration will be omitted.

Differences between the present embodiment and the first reference example described above, and executes a plurality of heat storage process during a single operating period of the internal combustion engine 1, more usually about first carried out regenerative treatment after engine start The point is that it will be executed early.

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 this reference example, 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.

The operation of the internal combustion engine provided with the heat storage device according to this reference example will be described below. 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 as 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 to shut off the second heater hose 11b and to connect the first heater hose 11a and the second bypass passage 16 to each other. It passed a circulation circuit as described in the description of Figure 6 which definitive example, to store the cooling water flowing out from the head side cooling water passage 2a to the heat storage container 13.

  Note that the execution time of the heat storage heat treatment may be a variable value that is changed by using 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, 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.

By thus ECU20 executes repeatedly heat storage control routine, as long as the operation of the internal combustion engine 1 is continued thermal storage process is increased repeatedly executed are at the same time the heat storage before temperature gradually, heat accumulation accordingly The amount of heat stored in the container 13 also gradually increases.

  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 reference example , the maximum amount of heat can be stored in the heat storage container 13 within a range corresponding to the operation condition 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 this reference example, 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 since 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 Reference Example >
Then, with the fifth reference example of an internal combustion engine having a thermal storage device according to the present invention will be described with reference to FIGS. 22 to 24. Here, a configuration different from the first reference example described above will be described, and description of the same configuration will be omitted.

Figure 22 is a diagram illustrating a cooling water circulation system of the car dual internal combustion engine in the present embodiment. Differences between the present embodiment and the first reference example described above, assume that a plurality of times of heat storage process during a single operating period of the internal combustion engine 1, the heat storage process execution timing in that case, an internal combustion The temperature is set at the time when the temperature of the cooling water circulating in the engine 1 becomes higher than the temperature of the cooling water in the heat storage container 13.

  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. 23 may be mapped in advance and stored in the ROM of the ECU 20.

The operation of the internal combustion engine provided with the heat storage device according to this reference example will be described below. 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. In addition, the second flow path switching valve 18 is controlled so as to shut off the second heater hose 11b and to connect the first heater hose 11a and the second bypass passage 16 to the first reference example described above. The circulation circuit as described in the explanation of FIG. 6 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.

  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 heat treatment.

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, in the internal combustion engine provided with the heat storage device according to this reference example, 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 heat storage amount of the heat storage container 13 can be increased.

Further, in the internal combustion engine equipped with the heat storage device according to this reference example, 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 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 reference example , the maximum amount of heat can be stored in the heat storage container 13 within a range corresponding to the operation condition of the internal combustion engine.

In this reference example, the heat storage control routine is executed when the internal combustion engine 1 is in an operating state. However, in addition to when the internal combustion engine 1 is in an operating state, immediately after 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 Reference Example>
Next, about the sixth reference example of an internal combustion engine having a thermal storage device according to the present invention will be described with reference to FIGS. 25 26. Here, a configuration different from the first reference example described above will be described, and description of the same configuration will be omitted.

Differences between the present embodiment and the first reference example described above, assume that a plurality of times of heat storage process during a single operating period of the internal combustion engine 1, the heat storage process execution timing in that case, an internal combustion The temperature is set at a time when the temperature of the cooling water circulating in the engine 1 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 value of the coolant temperature, the frequency of heat storage heat treatment will increase excessively under circumstances where the coolant 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 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. This is because of this.

The operation of the internal combustion engine provided with the heat storage device according to this reference example will be described below. 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. In addition, the second flow path switching valve 18 is controlled so as to shut off the second heater hose 11b and to connect the first heater hose 11a and the second bypass passage 16 to the first reference example described above. The circulation circuit as described in the explanation of FIG. 6 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.

  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 .

As described above, in the internal combustion engine provided with the heat storage device according to this reference example, the first heat storage heat treatment after the engine start is the time when it is determined that the coolant temperature: THW is higher than the coolant temperature previous value: THWold. Therefore, the amount of heat stored in the heat storage container 13 can be increased even if 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 reference example, the second and subsequent heat storage heat treatment after the engine start is performed at a predetermined heat storage temperature when the coolant temperature: THW is lower than the coolant temperature previous value: THWold. Since it is executed whenever the difference becomes higher than the difference, as long as the operation of the internal combustion engine 1 is continued and the engine-side water temperature rises, the amount of heat stored in the heat storage container 13 is gradually increased.

Therefore, according to the internal combustion engine including the heat storage device according to the present reference example , the maximum amount of heat can be stored in the heat storage container 13 within a range corresponding to the operation condition of the internal combustion engine.

<Implementation of the form>
Next, the implementation in the form of an internal combustion engine having a thermal storage device according to the present invention will be described with reference to FIG. 27. Here, configurations different from the above-described second to sixth reference examples will be described, and description of similar configurations will be omitted.

In the above-described second to sixth reference examples, one or a plurality of heat storage heat treatments are performed during the operation period of the internal combustion engine 1, but in the present 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, 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 ECU 20 performs the heat storage completion flag described in the above second to sixth reference examples. The 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. When by controlling the second flow path switching valve 18 so as to conduct the second bypass passage 16, thereby establishing a circulation circuit as described in the description of Figure 6 that those of the first reference example described above, 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 .

The first to sixth reference example described above, and definitive cooling water circulation system for example, the flow direction of the cooling water by the flow direction and a mechanical water pump 10 of the cooling water by the electric water pump 14 is identical Therefore, heat storage can be performed regardless of the operating state of the mechanical water pump 10, but the flow direction of the cooling water by the electric water pump 14 is opposite to the flow direction of the cooling water by the mechanical water pump 10. In such a case, 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 heat treatment 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 diagram showing a schematic configuration of a cooling water circulation system of an internal combustion engine for a vehicle that those of the first 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. Is a flowchart showing a heat storage control routine definitive to the second reference example. It is a diagram showing the transition of the cooling water temperature definitive to the second reference example. It is a diagram showing a schematic configuration of a cooling water circulation system of the third vehicle internal combustion engine definitive Reference Example. It is a flowchart showing a heat storage control routine definitive to the third reference example. 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. Is a flowchart showing a heat storage control routine definitive to the fourth reference example. 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 diagram showing a schematic configuration of a cooling water circulation system for a vehicle internal combustion engine definitive to the fifth embodiment. Is a diagram showing the relationship between the fifth definitive Reference Example regenerative running temperature difference and the outside air temperature and the water temperature increase rate. Is a flowchart showing a heat storage control routine definitive to the fifth embodiment. Is a diagram showing the relationship between the coolant temperature previous value and the heat storage before temperature and outside air temperature definitive in Reference Example sixth. It is a flowchart showing a heat storage control routine definitive in Reference Example sixth. It is a flowchart showing a heat storage control routine in the form of implementation.

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 control valve 25 ... container side temperature sensor 50 ... radiator fan 50a · · fan motor

Claims (2)

A heat medium flow passage formed in the internal combustion engine for circulating the heat medium;
A heat storage device that retains 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;
  Storage processing means for storing a part of the heat medium in the heat storage device when the heat medium flowing through the heat medium flow passage satisfies a predetermined condition;
When a part of the heat medium flowing through the heat medium flow passage cannot be stored in the heat storage device in the period from the start of the internal combustion engine to the operation stop, the operation is stopped when the operation of the internal combustion engine is stopped. An engine stop storage means for storing a part of the heat medium in the heat medium flow passage in the heat storage container;
An internal combustion engine provided with a heat storage device. A heating means for heating the heat medium in the heat medium flow passage;
2. The internal combustion engine having a heat storage device according to claim 1, wherein the storage unit when the engine is stopped heats the heat medium in the heat medium flow passage by the heating unit and then stores the heat medium in the heat storage device.

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