JP2005256672A - Warming up and cooling system of internal combustion engine and vehicle mounting it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly warm and store a heat exchange medium to warm and cool an inernal combustion engine, and to suitably control the temperature of the heat exchange medium. <P>SOLUTION: At the time of starting the engine, the engine is warmed by supplying warm water stored in a heat storage tank into a cooling water passage (S100 to S120). Then, when cooling water warmed by heat exchanging with the engine is collected into the heat storage tank, a fan mounted in a radiator of an engine cooling system is indicated to drive with the necessary and minimum effort (S160). As a result, cooling water can be quickly warmed and stored in the heat storage tank, and the temperature of cooling water can be suitably controlled during of collecting cooling water into the heat storage tank. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to an internal combustion engine warm-up cooling system and an automobile equipped with the same, and more particularly to warming up the internal combustion engine when starting the internal combustion engine using a heat exchange medium and cooling the internal combustion engine during normal operation of the internal combustion engine. The present invention relates to a warm-up / cooling system for an internal combustion engine and an automobile equipped with the same.

Conventionally, as this type of warm-up cooling system for an internal combustion engine, a system that prohibits the fan operation of a radiator provided in the cooling system until the cooling water of the internal combustion engine is collected in a heat storage device has been proposed (for example, Patent Document 1). In this system, the fan operation is prohibited until the cooling water is collected in the heat storage device, and the fan operation is started when the temperature of the cooling water reaches the fan operation inhibition upper limit temperature until the cooling water is collected in the heat storage device. As a result, the cooling water is quickly heated and collected in the heat storage device, and overheating of the internal combustion engine is prevented.
JP 2003-184553 A

  From the viewpoint of rapid heating of the cooling water, it is considered effective to prohibit the fan operation of the radiator until the cooling water is recovered to the heat storage device as in the above system, but the cooling water is recovered to the heat storage device. Since the fan operation is prohibited until this time, the temperature of the cooling water during this period cannot be controlled appropriately.

  An object of the warm-up / cooling system for an internal combustion engine and an automobile equipped with the same of the present invention is to more appropriately control the temperature of a heat exchange medium for warming up or cooling the internal combustion engine. Another object of the warm-up / cooling system for an internal combustion engine of the present invention and a vehicle equipped with the warm-up / cooling system is to quickly heat and store a heat exchange medium for warming up or cooling the internal combustion engine.

  The warm-up / cooling system for an internal combustion engine of the present invention and the vehicle equipped with the same employ the following means in order to achieve at least a part of the above-described object.

The warm-up / cooling system for an internal combustion engine of the present invention includes:
A warm-up cooling system for an internal combustion engine that warms up the internal combustion engine when starting the internal combustion engine using a heat exchange medium and cools the internal combustion engine during normal operation of the internal combustion engine,
Heat exchange means for cooling the heat exchange medium heated by heat exchange with the internal combustion engine using outside air;
Medium circulation means for circulating the heat exchange medium in a circulation flow path of a heat exchange medium including the internal combustion engine and the heat exchange means;
An outside air flow rate adjusting means for adjusting a flow rate of outside air used for cooling the heat exchange medium in the heat exchange means;
A heat storage means for guiding a heat exchange medium heated by heat exchange with the internal combustion engine from the circulation flow path and storing the heat exchange medium in a heat-retaining manner;
Medium supply means for supplying the heat exchange medium stored in the heat storage means to the internal combustion engine via the circulation channel;
When the internal combustion engine is started, the medium supply means is controlled so that the internal combustion engine is warmed up using the heat exchange medium stored in the heat storage means, and after the internal combustion engine is started, heat exchange with the internal combustion engine is performed. Control means for controlling the outside air flow rate adjusting means so that the flow rate of the outside air exchanging heat with the heat exchange medium in the heat exchanging means is reduced when storing the heated heat exchange medium in the heat accumulating means;
It is a summary to provide.

  In the warm-up / cooling system for an internal combustion engine of the present invention, the internal combustion engine is warmed up using the heat exchange medium stored in the heat storage means so as to be kept warm when the internal combustion engine is started. When storing the heated heat exchange medium, the outside air flow rate adjusting means is controlled so that the flow rate of outside air in the heat exchange means for cooling the heat exchange medium heated by heat exchange with the internal combustion engine using outside air is reduced. . Thereby, after starting an internal combustion engine, a heat exchange medium can be heated rapidly and can be stored in a thermal storage means. In addition, since only the flow rate of the outside air is reduced, the temperature of the heat exchange medium can be more appropriately controlled even while the heat exchange medium is stored in the heat storage means. Note that after the internal combustion engine is started, the internal combustion engine can be cooled by heat exchange with the heat exchange medium.

  In the warm-up / cooling system for an internal combustion engine according to the present invention, the control unit is configured to control the outside air flow rate so that the flow rate of the outside air exchanging heat with the heat exchange medium in the heat exchange unit becomes a necessary minimum flow rate during the storage medium. It can also be a means for controlling the adjusting means. In this way, the heat exchange medium can be quickly heated and the temperature of the heat exchange medium can be more appropriately controlled even while the heat exchange medium is stored in the heat storage means.

  The warm-up / cooling system for an internal combustion engine according to the present invention further comprises temperature detection estimation means for detecting or estimating the temperature of the internal combustion engine, and the control means is detected or estimated by the temperature detection estimation means during the storage. Further, the flow rate of the outside air that exchanges heat with the heat exchange medium in the heat exchanging means becomes a minimum adjustable flow rate until the temperature of the internal combustion engine reaches the upper limit temperature of the predetermined temperature range or a temperature near the upper limit temperature. It may be a means for controlling the outside air flow rate adjusting means. In this way, it is possible to prevent the temperature of the internal combustion engine from exceeding the upper limit temperature in the predetermined temperature range. Here, the temperature detection estimating means includes one that directly detects the temperature of the internal combustion engine and one that detects the temperature of the heat exchange medium heated by heat exchange with the internal combustion engine to estimate the temperature of the internal combustion engine. It is. In the latter case of estimating the temperature of the internal combustion engine, the temperature of the heat exchange medium may be directly used in addition to the temperature of the internal combustion engine.

  Further, in the warm-up / cooling system for an internal combustion engine according to the present invention, the heat exchanging means is a means having a radiator, and the outside air flow rate adjusting means is attached to the radiator and adjusts the flow rate of the outside air passing through the radiator. It can also be a means having a fan.

  The automobile of the present invention includes an internal combustion engine, and the warm-up / cooling system for an internal combustion engine of the present invention according to any one of the above-described embodiments for warming up and cooling the internal combustion engine, that is, basically using a heat exchange medium. A warm-up cooling system for an internal combustion engine that warms up the internal combustion engine when starting the internal combustion engine and cools the internal combustion engine during normal operation of the internal combustion engine, the heat heated by heat exchange with the internal combustion engine A heat exchange means for cooling the exchange medium using outside air, a medium circulation means for circulating the heat exchange medium in a circulation flow path of the heat exchange medium including the internal combustion engine and the heat exchange means, and the heat exchange means. An outside air flow rate adjusting means for adjusting a flow rate of outside air used for cooling the heat exchange medium, and a heat storage means for guiding the heat exchange medium heated by heat exchange with the internal combustion engine from the circulation flow path and storing the heat exchange medium so as to be able to keep heat. The heat storage means Medium supply means for supplying the obtained heat exchange medium to the internal combustion engine via the circulation flow path, and the internal combustion engine is warmed up using the heat exchange medium stored in the heat storage means when the internal combustion engine is started. At the time of storing the heat exchange medium heated by heat exchange with the internal combustion engine after controlling the medium supply means and starting the internal combustion engine, the heat exchange medium and the heat in the heat exchange means are stored. The gist of the present invention is to mount a warm-up / cooling system for an internal combustion engine that includes control means for controlling the outside air flow rate adjusting means so that the flow rate of outside air to be exchanged is reduced.

  Since the automobile according to the present invention is equipped with the warm-up / cooling system for an internal combustion engine of the present invention according to any one of the above-described aspects, the effect exhibited by the warm-up / cooling system for an internal combustion engine according to the present invention, for example, The effect of being able to perform cooling and cooling, the effect of being able to quickly heat and store the heat exchange medium in the heat storage means after starting the internal combustion engine, and the heat exchange medium even while the heat exchange medium is being stored in the heat storage means The effect similar to the effect etc. which can control temperature of this more appropriately can be show | played.

  Next, the best mode for carrying out the present invention will be described using examples.

  FIG. 1 is a configuration diagram showing an outline of the configuration of a warm-up / cooling system 20 for an internal combustion engine mounted on an automobile as an embodiment of the present invention. As shown in the figure, the warm-up cooling system 20 of the embodiment includes a cooling system 21 that cools the engine 10 by circulating cooling water as a cooling medium through a cooling water passage 12 formed in the engine 10, and an engine 10. A warming system 31 that warms the passenger compartment using cooling water heated by heat exchange, a warming system 41 that warms up the engine 10 by warm water that is heated and kept warm by heat exchange with the engine 10, and a system And an electronic control unit 60 for controlling the whole.

  The cooling system 21 includes a radiator 24 provided in a circulation channel 22 that circulates cooling water in the cooling water channel 12 of the engine 10, a circulation pump 28 that circulates cooling water, and cooling water from the circulation channel 22. And a thermostat 30 for adjusting the supply to the circulation pump 28 based on the temperature. A fan 26 is attached to the radiator 24, and the fan 26 is driven as necessary.

  The heating system 31 is disposed between a heater 36 connected to a branch pipe 32 connected to the cooling water flow path 12 of the engine 10 via a three-way valve 34, and the heater 36 and the three-way valve 34. And a heating pump 38 for pressure-feeding the cooled cooling water to the heater 36, driving the three-way valve 34 to connect the heater 36 to the branch pipe 32, and driving the heating pump 38. The heated cooling water is pumped to the heater 36 to heat the passenger compartment. The branch pipe 32 is also branched from a branch pipe that allows warm water to flow through the throttle body 52.

  The warm-up system 41 includes a heat storage tank 42 connected to the branch pipe 32 of the heating system 31 via a three-way valve 34, and a warm-up pump 44 that pumps warm water stored in the heat storage tank 42 to the engine 10 side. And the warm-up pump 44 is connected to the branch pipe 32 and the warm-up pump 44 is driven, so that the warm water stored in the heat storage tank 42 is kept warm. The engine 10 is warmed up by supplying it to the cooling water flow path 12. When the warming-up of the engine 10 is completed, the warming-up system 41 collects the cooling water pumped by the circulation pump 28 and heated by heat exchange with the engine 10 into the heat storage tank 42 via the branch pipe 32.

  The electronic control unit 60 is configured as a microprocessor centered on the CPU 62, and includes a ROM 64 for storing processing programs, a RAM 66 for temporarily storing data, and an input / output port (not shown) in addition to the CPU 62. The electronic control unit 60 includes an engine temperature Tw1 of the cooling water from the temperature sensor 14 attached to the cooling water flow path 12 of the engine 10 and a temperature sensor 46 attached in the vicinity of the inlet / outlet of the heat storage tank 42 of the warm-up system 41. The cooling water tank inlet / outlet temperature Tw2 and the like are input via the input port. Further, from the electronic control unit 60, a drive signal to the motor 27 that rotationally drives the fan 26, a drive signal to the circulation pump 28, the warming pump 38, the warm-up pump 44, and a drive signal to the three-way valve 34. , A drive signal to the heater 36 is output via the output port.

  Next, the operation of the warm-up cooling system 20 of the embodiment configured as described above, particularly the operation when the engine 10 is warmed up when the engine 10 is started and then the heated cooling water is recovered in the heat storage tank 42. explain. FIG. 2 is a flowchart showing an example of a startup warm-up process routine executed by the electronic control unit 60 when starting the engine 10. When this routine is executed, the CPU 62 of the electronic control unit 60 first drives the three-way valve 34 to connect only the heat storage tank 42 to the branch pipe 32 (step S100) and also drives the warm-up pump 44. Then, the hot water stored and stored in the heat storage tank 42 is pumped to the cooling water flow path of the engine 10 (step S110) and waits for a predetermined time (step S120). Here, the predetermined time is set as the time required to warm the engine 10 by supplying the hot water in the heat storage tank 42 to the cooling water flow path 12 of the engine 10.

  When the warm-up pump 44 is driven and a predetermined time has elapsed, the warm-up pump 44 is stopped (step S130), and the three-way valve 34 is driven to disconnect the heat storage tank 42 from the branch pipe 32. The heater 36 is connected (step S135), and the engine 10 is allowed to start (step S140). When the engine 10 is permitted to start, a starter motor (not shown) is driven, and the engine 10 is cranked and started. Then, the driving of the circulation pump 28 is started (step S150), and the engine part water temperature Tw1 detected by the temperature sensor 14 attached to the cooling water flow path 12 of the engine 10 is waited for becoming higher than the threshold value Tref (step S155). ). Here, the threshold value Tref is set as the lowest temperature of the hot water when the hot water is collected in the heat storage tank 42. The cooling water at this time circulates in the cooling system 21 by driving the circulation pump 28 and also flows into the heater 36 side by the three-way valve 34.

  When the engine water temperature Tw1 becomes higher than the threshold value Tref, the fan minimum drive flag F is set to 1 so as to drive the fan 26 with the necessary minimum (step S160), and the three-way valve 34 is fully opened to store heat in the branch pipe 32. The tank 42 and the heater 36 are both connected (step S165). Here, the fan minimum drive flag F is used in a fan drive processing routine (not shown) that drives and controls the fan 26 based on the engine temperature Tw1 from the temperature sensor 14 attached to the coolant flow path 10 of the engine 10. This is to request that the fan 26 be controlled with a minimum amount of drive until the temperature reaches the upper limit of the allowable temperature at which 10 can be operated without impairing its function. Therefore, when the value 1 is set in the fan minimum drive flag F, the fan 26 is controlled by the minimum necessary drive. The cooling water at this time circulates in the cooling system 21 by driving the circulation pump 28, but also flows into the heat storage tank 42 and the heater 36 side because the three-way valve 34 is fully opened.

  When the fan 26 is instructed to be controlled at the minimum drive in this way, the tank inlet / outlet portion temperature Tw2 from the temperature sensor 46 attached in the vicinity of the inlet / outlet of the heat storage tank 42 on the condition that the operation of the engine 10 is not stopped is the target temperature. Wait until T * is reached (steps S170 to S190). Here, the target temperature T * is set as the temperature of hot water to be stored in the heat storage tank 42. When the tank inlet / outlet temperature Tw2 reaches the target temperature T *, the fan minimum drive flag F is set to 0 so as to release the minimum required drive of the fan 26 (step S200), and the three-way valve 34 is driven. Then, the connection between the branch pipe 32 and the heat storage tank 42 is released (step S210), and this routine is finished. As a result, hot water having a temperature to be stored can be stored in the heat storage tank 42.

  On the other hand, if the operation of the engine 10 is stopped before the tank inlet / outlet portion temperature Tw2 reaches the target temperature T *, the minimum necessary amount of the fan 26 is the same as when the tank inlet / outlet portion temperature Tw2 reaches the target temperature T *. The fan minimum drive flag F is set to 0 so as to release the drive (step S200), and the three-way valve 34 is driven to release the connection between the branch pipe 32 and the heat storage tank 42 (step S210). This routine ends. Thereby, although the temperature is low, hot water having a temperature as high as possible can be stored in the heat storage tank 42.

  According to the warm-up / cooling system 20 of the embodiment described above, when the hot water is recovered to the heat storage tank 42, the fan 26 is instructed to be driven and controlled with the minimum necessary. Can be stored in the heat storage tank 42. In addition, since the fan 26 is not stopped and driven with the minimum necessary amount, the temperature of the cooling water can be adjusted even while the hot water is being collected in the heat storage tank 42.

  In the warm-up cooling system 20 of the embodiment, when the hot water is collected in the heat storage tank 42, the fan 26 is instructed to be driven and controlled with the minimum necessary, but the allowable temperature at which the engine 10 can operate is set. The fan 26 may be instructed to be driven at the minimum number of revolutions until reaching the upper limit temperature or a temperature near the upper limit temperature.

  In the warm-up cooling system 20 of the embodiment, the connection between the branch pipe 32 and the heat storage tank 42 by the three-way valve 34 is maintained even after the engine 10 is started, but the three-way valve 34 is started when the engine 10 is started. The connection between the branch pipe 32 and the heat storage tank 42 is released, and the engine temperature Tw1 from the temperature sensor 14 attached to the cooling water flow path 12 of the engine 10 becomes a temperature close to the temperature of the hot water to be stored in the heat storage tank 42. In this case, the branch pipe 32 and the heat storage tank 42 may be connected by the three-way valve 34 to collect the hot water in the heat storage tank 42.

  In the warm-up cooling system 20 of the embodiment, the warm-up cooling system 20 is mounted on an automobile, but the warm-up cooling system 20 may be mounted on a vehicle such as a train other than an automobile, such as a ship or an aircraft. It is good also as what is mounted in other moving bodies. Moreover, it does not matter as what is incorporated in facilities other than moving bodies, such as construction equipment.

  The best mode for carrying out the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention. Of course, it can be implemented in the form.

It is a block diagram which shows the outline of a structure of the warming-up cooling system 20 of the internal combustion engine as one Example of this invention. 3 is a flowchart showing an example of a start warm-up process routine executed by an electronic control unit 60.

Explanation of symbols

10 Engine, 12 Cooling water flow path, 14 Temperature sensor, 20 Warm-up cooling system, 21 Cooling system, 22 Circulation flow path, 24 Radiator, 26 Fan, 27 Motor, 28 Circulation pump, 30 Thermostat, 31 Heating system, 32 Branch pipe, 34 Three-way valve, 36 Heater, 38 Heating pump, 41 Warm-up system, 42 Heat storage tank, 44 Warm-up pump, 46 Temperature sensor, 52 Throttle body, 60 Electronic control unit, 62 CPU, 64 ROM, 66 RAM.

Claims (5)

A warm-up cooling system for an internal combustion engine that warms the internal combustion engine by supplying a heat exchange medium that is kept warm at the start of the internal combustion engine to warm the internal combustion engine and cools the internal combustion engine during normal operation of the internal combustion engine. And
Heat exchange means for cooling the heat exchange medium heated by heat exchange with the internal combustion engine using outside air;
Medium circulation means for circulating the heat exchange medium in a circulation flow path of a heat exchange medium including the internal combustion engine and the heat exchange means;
An outside air flow rate adjusting means for adjusting a flow rate of outside air used for cooling the heat exchange medium in the heat exchange means;
A heat storage means for guiding a heat exchange medium heated by heat exchange with the internal combustion engine from the circulation flow path and storing the heat exchange medium so that the heat can be maintained;
Medium supply means for supplying the heat exchange medium stored in the heat storage means to the internal combustion engine via the circulation channel;
When the internal combustion engine is started, the medium supply means is controlled so that the internal combustion engine is warmed up using the heat exchange medium stored in the heat storage means, and after the internal combustion engine is started, heat exchange with the internal combustion engine is performed. Control means for controlling the outside air flow rate adjusting means so that the flow rate of the outside air exchanging heat with the heat exchange medium in the heat exchanging means is reduced when storing the heated heat exchange medium in the heat accumulating means;
A warm-up / cooling system for an internal combustion engine.   The said control means is a means which controls the said outside air flow rate adjustment means so that the flow volume of the external air which heat-exchanges with the said heat exchange medium in the said heat exchange means becomes the minimum required flow volume at the time of the said storage medium. Warm-up cooling system for internal combustion engines. An internal combustion engine warm-up cooling system according to claim 1,
Temperature detection estimating means for detecting or estimating the temperature of the internal combustion engine,
The control means is configured so that the temperature of the internal combustion engine detected or estimated by the temperature detection estimating means at the time of the storage medium reaches the upper limit temperature of the predetermined temperature range or a temperature near the upper limit temperature. A warm-up / cooling system for an internal combustion engine, which is means for controlling the outside air flow rate adjusting means so that a flow rate of outside air for heat exchange with a heat exchange medium becomes a minimum adjustable flow rate. A warm-up / cooling system for an internal combustion engine according to any one of claims 1 to 3,
The heat exchange means is a means having a radiator,
The warm-up / cooling system for an internal combustion engine, wherein the outside air flow rate adjusting means is a means that is attached to the radiator and has a fan that adjusts the flow rate of outside air passing through the radiator. An automobile equipped with an internal combustion engine and the warm-up cooling system for an internal combustion engine according to any one of claims 1 to 4, which warms up and cools the internal combustion engine.

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