JP2017198137A - Engine cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine cooling device for enabling quick warming-up of an engine and a device whose warming-up is desirably promoted.SOLUTION: An engine cooling device 1 includes a radiator flow path 10 for distributing refrigerant from a cylinder head 3 of an engine 2 mounted on a vehicle to a radiator 5, a heat exchanger flow path 30 for distributing the refrigerant from the cylinder head 3, not via the radiator 5, to a heat exchanger 8 different from the radiator 5, and a control part 40 for, when the temperature of the refrigerant in the cylinder head 3 exceeds a preset heat exchanger threshold value during warming up the engine 2, distributing the refrigerant to the heat exchanger flow path 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an engine cooling device that cools an engine mounted on a vehicle.

  Conventionally, a technique for cooling an engine by circulating a refrigerant has been used. As this type of technology, there is one described in Patent Documents 1-3 shown below.

  The engine cooling device described in Patent Document 1 includes a radiator flow path for circulating cooling water discharged from the engine to the radiator, a bypass flow path for flowing cooling water discharged from the engine so as not to pass through the radiator, and the engine It is provided with a pump device that circulates the cooling water and is arranged on the side where the cooling water enters, and the opening area of the radiator flow channel, the bypass flow channel, and the suction port of the pump device is controlled by the valve device.

  The engine cooling device described in Patent Document 2 is provided on a heat exchange passage provided with at least one of an engine oil heat exchanger and a transmission oil heat exchanger, and controls the flow rate of cooling water in the passage. A heat exchange control valve and a heater control valve that is provided on a heater passage provided with a heater for indoor heating and controls the flow rate of cooling water in the passage are configured. These heat exchange control valves and heater control valves are controlled to be closed or closed for a predetermined period after the engine is started when cold.

  A cooling water temperature control apparatus for an internal combustion engine described in Patent Document 3 includes a radiator circuit in which cooling water flowing out from the internal combustion engine flows back to the internal combustion engine through the radiator, a bypass circuit that bypasses the radiator with respect to the radiator circuit, and the radiator A cooling water circuit provided in parallel with the circuit and having a heat radiation circuit in which the cooling water flowing out from the internal combustion engine flows back to the internal combustion engine through the heat radiation unit other than the radiator and circulates through the cooling water circuit The flow rate of the cooling water is controlled by one flow control valve.

JP 2002-38949 A Japanese Patent Laying-Open No. 2005-2970 JP 2002-106347 A

  The techniques described in Patent Documents 1 and 2 can stop the circulation of the cooling water immediately after starting the engine and promote the warm-up of the engine. Once the valve is opened, the warm cooling water in the engine Will flow out of the engine, and external cold coolant will flow into the engine. Therefore, the engine once warmed up may be cooled.

  Further, the technique described in Patent Document 3 can suppress the amount of warmed cooling water flowing out from the engine to a small amount by controlling the flow rate of the cooling water flowing through the cooling water circuit by the flow rate control valve. However, since the cooling water circuit includes the radiator circuit, there is a possibility that the cooled cooling water staying in the radiator circuit flows into the engine and the warm-up performance is deteriorated. Moreover, since the flow of the cooling water in the engine is in the order of the water pump, the cylinder block, and the cylinder head, the cooling water after passing through the cylinder head having the highest temperature flows out of the engine. For this reason, when the cooling water is cooled outside the engine, there is a possibility that the engine cannot be warmed up quickly.

  In addition to the engine, there are also devices (for example, EGR coolers) that are desired to be warmed up. However, in the technique described in Patent Documents 1-3, the temperature of the cooling water flowing out from the engine is lowered, so it is not easy to quickly warm up such a device.

  Therefore, there is a need for an engine cooling device that can quickly warm up the engine and that can quickly warm up devices other than the engine that are preferably accelerated.

  The characteristic configuration of the engine cooling device according to the present invention includes a radiator flow path for flowing a refrigerant from a cylinder head of an engine mounted on a vehicle to a radiator, and heat different from that of the radiator without passing through the radiator from the cylinder head. A heat exchanger flow path through which the refrigerant flows, and when the engine is warmed up, the temperature of the refrigerant in the cylinder head exceeds a preset heat exchanger threshold value. And a control unit for circulating the refrigerant in the flow path.

  With such a characteristic configuration, immediately after starting the engine, the refrigerant flow in the engine is stopped and the refrigerant is warmed by the cylinder head having the highest temperature. It is possible to warm up a heat exchanger that is different from the radiator. Therefore, for example, by making a “heat exchanger different from a radiator” a device where it is desirable to promote warm-up, it is desirable to warm up the engine quickly and promote warm-up with a small amount of refrigerant. The device can also be warmed up quickly.

  Further, the engine cooling device includes an in-cylinder flow path through which the refrigerant flows from the cylinder head to the cylinder block, and the control unit exceeds a preset in-cylinder threshold value in the cylinder head. In this case, it is preferable that the refrigerant flows through the in-cylinder flow path.

  With such a configuration, the temperature in the engine can be made uniform with a small amount of water by circulating the refrigerant heated by the cylinder head through the cylinder block. Therefore, it is possible to promote warming up of the engine.

  Further, the heat exchanger flow path includes a first heat exchanger flow path through which the refrigerant flows through a heater that warms the vehicle interior, and a second heat exchange through which the refrigerant flows through a heat exchanger different from the heater. And the control unit is configured to branch to the second heat exchanger channel when there is no instruction to operate the heater and fuel is injected in the engine. It is preferable to circulate the refrigerant.

  With such a configuration, for example, by setting the “second heat exchanger” as a device in which it is desirable to promote warm-up, the warm-up of the device is promoted when there is no instruction to operate the heater. be able to.

  Further, the heat exchanger flow path includes a first heat exchanger flow path through which the refrigerant flows through a heater that warms the vehicle interior, and a second heat exchange through which the refrigerant flows through a heat exchanger different from the heater. The controller is configured to diverge into a flow path for the heat exchanger, and the control unit distributes the refrigerant through both the flow path for the first heat exchanger and the flow path for the second heat exchanger when there is an operation instruction for the heater. It is preferable to do so.

  With such a configuration, for example, even when the “second heat exchanger” is a device that is desired to promote warm-up, when there is a heater operation instruction, the warm-up of the device is performed. Rather, the passenger comfort can be enhanced by warming the interior of the vehicle.

  Further, the heat exchanger flow path includes a first heat exchanger flow path through which the refrigerant flows through a heater that warms the vehicle interior, and a second heat exchange through which the refrigerant flows through a heat exchanger different from the heater. The controller is configured to be branched into a flow path for the heater, and the control section is configured to flow the first heat exchanger flow path when there is no instruction to operate the heater and when the fuel is not injected in the engine. It is preferable to stop the flow of the refrigerant in both the second heat exchanger flow path.

  When the fuel is not supplied to the engine, the amount of heat released from the cylinder head is smaller than the amount of heat when the fuel is supplied to the engine. For this reason, if it is set as such a structure, it can prevent that a refrigerant | coolant is cooled by the flow path for 1st heat exchangers, or the flow path for 2nd heat exchangers by stopping the distribution | circulation of the refrigerant | coolant from a cylinder head. Therefore, it is possible to prevent the temperature of the engine from being lowered during warm-up or after warm-up is finished.

  In addition, an in-cylinder flow path for allowing the refrigerant to flow from the cylinder head to the cylinder block is provided, and the control unit preliminarily adjusts the temperature of the engine when the engine is warmed up or when the engine is warmed up. It is preferable that the refrigerant is circulated from the cylinder head to the cylinder block in a situation where the temperature rises with a gradient larger than a set value.

  When the engine temperature rises with a gradient greater than a preset value, it is necessary to cool the cylinder head and cylinder block. For this reason, if it is set as such a structure, it will become possible to cool a cylinder head and a cylinder block by distribute | circulating a refrigerant | coolant to a cylinder head and a cylinder block.

It is the schematic diagram which showed the structure of the engine cooling device. It is a flowchart which shows a process of an engine cooling device. It is a flowchart which shows the interruption process of an engine cooling device. It is a flowchart which shows the interruption process of an engine cooling device.

  The engine cooling device according to the present invention is configured to quickly warm up the engine. Hereinafter, the engine cooling device 1 of the present embodiment will be described.

  FIG. 1 is a diagram schematically showing the configuration of the engine cooling device 1. As shown in FIG. 1, the engine cooling device 1 includes a radiator flow path 10, an in-cylinder flow path 20, a heat exchanger flow path 30, and a control unit 40.

  The radiator flow path 10 causes the refrigerant to flow from the cylinder head 3 of the engine 2 mounted on the vehicle to the radiator 5. The engine 2 is a power source for the vehicle, and burns fuel to output rotational power. In the present embodiment, the engine 2 includes a cylinder head 3 and a cylinder block 4. The cylinder head 3 is a portion that accommodates a valve or a spark plug that inhales a mixed gas composed of fuel and air into the cylinder and exhausts exhaust gas after combustion. Is the part containing the cylinder. Therefore, when the engine 2 is operated, the cylinder head 3 generates more heat than the cylinder block 4 due to fuel combustion.

  The radiator 5 is a device that exchanges heat between the traveling wind according to the traveling of the vehicle, the wind from a fan (not shown), and the refrigerant that has flowed out of the cylinder head 3. Such a circulation of the refrigerant is performed by driving a pump 6 provided on the inlet side of the cylinder head 3 and opening a thermo valve 7 provided on the upstream side of the pump 6 according to the temperature of the refrigerant. . In the present embodiment, the thermo valve 7 automatically opens and closes according to the temperature of the refrigerant flowing through the thermo valve 7, whereby the refrigerant flowing through the radiator flow path 10 according to the temperature of the refrigerant becomes the radiator 5. Cooled by.

  The in-cylinder flow path 20 allows the refrigerant to flow from the cylinder head 3 to the cylinder block 4. In FIG. 1, the cylinder head 3 and the cylinder block 4 are shown separated from each other, but actually, the cylinder head 3 and the cylinder block 4 integrally accommodate the piston. For this reason, the in-cylinder flow path 20 is provided in the peripheral wall portion of the engine 2. Here, a first valve 91 is provided on the downstream side of the cylinder block 4. When the first valve 91 is opened, the cylinder head 3 passes through the in-cylinder flow path 20 via the thermo valve 7 and the pump 6. Thus, the refrigerant flows through the cylinder block 4. On the other hand, when the first valve 91 is closed, the refrigerant flow in the in-cylinder flow path 20 is stopped.

  The heat exchanger flow path 30 allows the refrigerant to flow from the cylinder head 3 to the heat exchanger 8 different from the radiator 5 without passing through the radiator 5. The “heat exchanger 8 different from the radiator 5” is preferably a device that is used after warming up in advance, a device that is used to make the ride comfort of the passenger comfortable, or warming up. Corresponds to a device that may be warmed up while being used. Specifically, the EGR cooler 8A, the heater 8B, and the transmission heat exchanger 8C correspond to each other.

  In the present embodiment, the heat exchanger flow path 30 is divided into a first heat exchanger flow path 31 and a second heat exchanger flow path 32. The first heat exchanger channel 31 allows the refrigerant to flow through the heater 8B that warms the interior of the vehicle. Thereby, the heater 8B can be warmed by the refrigerant warmed by the cylinder head 3, and the room can be heated. On the other hand, the second heat exchanger channel 32 allows the refrigerant to flow through the EGR cooler 8A and the transmission heat exchanger 8C, which are heat exchangers different from the heater 8B. EGR cooler 8A is an exhaust gas recirculation (EGR) that takes out part of exhaust gas after combustion and re-intakes it for the purpose of reducing nitrogen oxides in the exhaust gas and improving fuel efficiency. It is a device used for cooling. The transmission heat exchanger 8C is a device used for cooling a transmission mounted on a vehicle.

  Here, the path through which the refrigerant that has flowed through the EGR cooler 8A reaches the thermo valve 7 includes a path that reaches the thermo valve 7 via the second valve 92, and a thermo valve that passes through the check valve 95 and the third valve 93. There is a route to reach 7. The path reaching the thermo valve 7 via the second valve 92 is narrower than the path reaching the thermo valve 7 via the check valve 95 and the third valve 93. By doing in this way, the quantity of the refrigerant | coolant which goes to the engine 2 from the EGR cooler 8A can be decreased, and while warming up of the EGR cooler 8A is promoted, warming up of the engine 2 is promoted. In addition, since the refrigerant that has flowed through the heater 8B is provided with the check valve 95, the refrigerant cannot flow through the second valve 92 to the thermo valve 7, but only through the third valve 93. 7 can be distributed. In addition, the refrigerant that has flowed through the transmission heat exchanger 8 </ b> C is configured to be able to flow to the thermo valve 7 via the fourth valve 94.

  When the engine 2 is warmed up, the control unit 40 causes the refrigerant to flow through the heat exchanger channel 30 when the temperature of the refrigerant in the cylinder head 3 exceeds a preset heat exchanger threshold. When the engine 2 is operated, heat is generated by the combustion of fuel as described above. The engine 2 itself is warmed up by this heat. Further, when the engine 2 is warmed up to some extent, the refrigerant is also warmed up, so that the device provided in the heat exchanger flow path 30 is warmed up by circulating the refrigerant through the heat exchanger flow path 30. Is possible. The temperature of the refrigerant in the cylinder head 3 can be detected by the temperature sensor 9.

  In the present embodiment, the heat exchanger flow path 30 includes a first heat exchanger flow path 31 through which the refrigerant flows through the heater 8B, and a second heat exchanger flow path 32 through which the refrigerant flows through a heat exchanger different from the heater 8B. It is composed of two branches. In the present embodiment, the control unit 40 causes the refrigerant to flow through the second heat exchanger channel 32 when there is no operation instruction for the heater 8B and when fuel is injected in the engine 2. The operation instruction of the heater 8B is an operation of the heating switch by the passenger. The fact that fuel is being injected in the engine 2 means that the vehicle is not decelerating. Therefore, when the heating switch is not operated by the occupant and the vehicle is not decelerating, the control unit 40 opens the second valve 92 and the fourth valve 94 and the third valve 93. Is closed. This makes it possible to warm up the EGR cooler 8A and the transmission heat exchanger 8C.

  On the other hand, when there is no operation instruction for the heater 8B and the fuel is not being injected in the engine 2, the control unit 40 performs the first heat exchanger flow path 31 and the second heat exchanger flow path 32. The distribution of both refrigerants is stopped. That is, the control unit 40 closes the second valve 92, the third valve 93, and the fourth valve 94 when the heating switch is not operated by the occupant and the vehicle is decelerating. To do. Thereby, the circulation of the refrigerant to the EGR cooler 8A, the heater 8B, and the transmission heat exchanger 8C is stopped.

  Moreover, the control part 40 distribute | circulates a refrigerant | coolant to both the 1st heat exchanger flow path 31 and the 2nd heat exchanger flow path 32, when there exists a driving | operation instruction | indication of the heater 8B. That is, when the heating switch is operated by the occupant, the control unit 40 closes the second valve 92 and opens the third valve 93 and the fourth valve 94. Thereby, the refrigerant warmed by the engine 2 can be supplied to the EGR cooler 8A, the heater 8B, and the transmission heat exchanger 8C to perform heat exchange.

  In addition, when the temperature of the refrigerant in the cylinder head 3 exceeds a preset in-cylinder threshold, the control unit 40 causes the refrigerant to flow through the in-cylinder flow path 20. The temperature of the refrigerant in the cylinder head 3 is detected by a temperature sensor 9. The cylinder threshold is set at a temperature higher than the heat exchanger threshold. The controller 40 opens the first valve 91 when the temperature of the refrigerant in the cylinder head 3 exceeds the cylinder threshold. As a result, the refrigerant flows from the cylinder head 3 to the cylinder block 4. As a result, the temperature of the engine 2 can be made uniform, and the fuel combustion efficiency can be improved.

  Further, the control unit 40 determines whether the cylinder head is warmed up when the engine 2 is warmed up or when the temperature of the engine 2 rises with a gradient greater than a preset value during warming up of the engine 2. The refrigerant is circulated from 3 to the cylinder block 4. “When the engine 2 has been warmed up” can be determined by the fact that the temperature of the refrigerant in the cylinder head 3 by the temperature sensor 9 has reached a preset temperature. In such a case, the control unit 40 opens the first valve 91. As a result, the refrigerant flows from the cylinder head 3 to the cylinder block 4.

  “When the temperature of the engine 2 rises with a gradient greater than a preset value” refers to a case where the vehicle has accelerated rapidly by the operation of the occupant. Specifically, the engine speed has become greater than a preset speed, the refrigerant temperature has become greater than a preset temperature, and the load factor of the engine 2 has become greater than a preset value. It is also possible that at least one of the above is satisfied, or a case where all of the above conditions are satisfied. Even in such a case, the control unit 40 opens the first valve 91. As a result, the refrigerant flows from the cylinder head 3 to the cylinder block 4.

  Next, processing of the engine cooling device 1, particularly opening / closing control of each valve by the control unit 40, will be described using the flowchart shown in FIG. In the engine cooling device 1, when the ignition SW is turned on (step # 01: Yes), the control unit 40 closes the first valve 91, the second valve 92, the third valve 93, and the fourth valve 94. (Step # 02). Thereafter, the engine 2 is started (step # 03).

  When there is no operation instruction of the heater 8B by the occupant (step # 04: Yes), the refrigerant temperature in the cylinder head 3 in this state is greater than a preset value A (corresponding to a heat exchanger threshold) ( Step # 05: No), the engine 2 is warmed up.

  In step # 05, when the temperature of the refrigerant in the cylinder head 3 becomes higher than the value A (step # 05: Yes), it is confirmed whether or not the idle SW is turned off, that is, whether or not the vehicle is stopped. (Step # 06). When the idle switch is OFF, that is, when the vehicle is traveling (step # 06: Yes), the control unit 40 opens the second valve 92 and the fourth valve 94 (step # 08). . As a result, the EGR cooler 8A and the transmission heat exchanger 8C are warmed up.

  On the other hand, even when the idle SW is not OFF (step # 06: No), when the refrigerant temperature in the cylinder head 3 is larger than the preset value Y (step # 07: Yes), the control unit 40 controls the second valve 92. Then, the fourth valve 94 is opened (step # 08), and the EGR cooler 8A and the transmission heat exchanger 8C are warmed up. If the temperature of the refrigerant in the cylinder head 3 is not greater than the preset value Y (step # 07: No), the process returns to step # 06 and the process is continued. Here, the preset value Y is a value larger than the preset value A.

  In step # 08, when the control unit 40 opens the second valve 92 and the fourth valve 94, it is confirmed whether or not the temperature of the refrigerant in the cylinder head 3 is higher than a preset value B. (Step # 09). The preset value B is smaller than the preset value A.

  When the temperature of the refrigerant in the cylinder head 3 is higher than the preset value B (step # 09: Yes), it is considered that the EGR cooler 8A and the transmission heat exchanger 8C have been warmed up, and the control unit 40 closes the second valve 92 and the fourth valve 94 (step # 10). Thereby, the circulation of the refrigerant is stopped. When the temperature of the refrigerant in the cylinder head 3 is not greater than the preset value B, the warm-up of the EGR cooler 8A and the transmission heat exchanger 8C has not been completed. The process is suspended until the temperature becomes higher than a preset value B (step # 09: No).

  In step # 9, when the temperature of the refrigerant in the cylinder head 3 is higher than the preset value B, it is further confirmed whether or not the temperature of the refrigerant in the cylinder head 3 is higher than the preset value C. Is performed (step # 11). The preset value C is a value larger than the preset value Y. When the temperature of the refrigerant in the cylinder head 3 is larger than a preset value C (corresponding to a cylinder threshold) (step # 11: Yes), the control unit 40 includes a first valve 91, a second valve 92, The third valve 93 and the fourth valve 94 are opened (step # 13). Thereby, the refrigerant is circulated from the cylinder head 3 to the cylinder block 4, the EGR cooler 8A, and the transmission heat exchanger 8C. Thereafter, this state is maintained until the ignition SW is turned off (step # 14: No). When the ignition SW is turned off (step # 14: Yes), the processing of the engine cooling device 1 is finished.

  In step # 11, the refrigerant temperature in the cylinder head 3 is not greater than a preset value C (step # 11: No), and the refrigerant temperature in the cylinder head 3 is a preset value. When it is not larger than B (step # 12: Yes) (that is, when the temperature of the refrigerant in the cylinder head 3 is smaller than B), the process returns to step # 08 and continues. On the other hand, in step # 11, the refrigerant temperature in the cylinder head 3 is not greater than the preset value C (step # 11: No), and the refrigerant temperature in the cylinder head 3 is preset. When the value is larger than the value B (step # 12: No) (that is, when B <the temperature of the refrigerant in the cylinder head 3 <C), the process returns to step # 10 and the processing is continued. Here, in the comparison between the refrigerant temperature and the value B in step # 12, the refrigerant temperature in the engine 2 is detected accurately because the refrigerant is not moving in the path with each valve closed. Not expected. Therefore, in this case, the temperature of the refrigerant in the cylinder head 3 is estimated using the detection result of the temperature sensor 9, the elapsed time since the second valve 92 and the fourth valve 94 are opened, the outside air temperature, and the like. The estimated value may be used.

  In Step # 04, when there is an operation instruction of the heater 8B by the occupant (Step # 04: No), the control unit 40 controls the third valve 93 and the fourth valve 94 to give priority to the ride comfort of the occupant. The valve is opened (step # 15). As a result, the refrigerant flows from the cylinder head 3 to the EGR cooler 8A, the heater 8B, and the transmission heat exchanger 8C. Therefore, the room is heated as the device warms up. Thereafter, when the ignition SW is turned off (step # 16: Yes), the processing of the engine cooling device 1 is ended. On the other hand, when the ignition SW is not OFF (step # 16: No), the process returns to step # 04, where it is determined whether or not there is an operation instruction for the heater 8B, and the process is continued.

  The engine cooling apparatus 1 performs processing according to such a flow, but interrupt processing is prepared regardless of the flowchart of FIG. 3 and 4 show a flowchart of such interrupt processing.

  In step # 08 and step # 10, the second valve 92 and the fourth valve 94 are opened. However, for example, when priority is given to warm-up of the engine 2, only the second valve 92 is opened. The fourth valve 94 may be closed in the valve state.

  When the processing according to the flow of FIG. 2 is performed, as shown in FIG. 3, if the cylinder block water passage condition is satisfied (step # 101: Yes) and the heater 8B is in operation (step) (# 102: Yes), the control unit 40 opens the first valve 91, the third valve 93, and the fourth valve 94, and closes the second valve 92 (step # 103). Here, the cylinder block water flow condition is a condition for determining the above-described “the temperature of the engine 2 has risen with a gradient greater than a preset value”. Specifically, the engine speed has become greater than a preset speed, the refrigerant temperature has become greater than a preset temperature, and the load factor of the engine 2 has become greater than a preset value. The cylinder block water flow condition may be satisfied when at least one of the above conditions is satisfied, or the cylinder block water flow condition may be satisfied when all of the conditions are satisfied. . In this state, the process is continued until the cylinder block water passage condition is not satisfied (step # 101: No).

  In step # 102, if the heater 8B is not in operation (step # 102: No), the control unit 40 opens the first valve 91, the second valve 92, and the fourth valve 94, and the third valve 93. Is closed (step # 104). In this state, the process is continued until the cylinder block water passage condition is not satisfied (step # 101: No).

  Further, when the processing along the flow of FIG. 2 is performed, as shown in FIG. 4, if the deceleration processing condition is satisfied (Step # 201: Yes) and the heater 8B is in operation (Step S201). (# 202: Yes), the control unit 40 opens the third valve 93 and closes the first valve 91, the second valve 92, and the fourth valve 94 (step # 203). Here, the deceleration processing condition refers to the deceleration processing condition when at least one of the fact that fuel is not supplied into the cylinder of the engine 2 and the vehicle speed is a negative gradient at a predetermined value or higher is satisfied. It should be configured to satisfy. In this state, the processing is continued until the deceleration processing condition is not satisfied (step # 201: No).

  In step # 202, if the heater 8B is not in operation (step # 202: No), the control unit 40 closes the first valve 91, the second valve 92, the third valve 93, and the fourth valve 94. (Step # 204). In this state, the processing is continued until the deceleration processing condition is not satisfied (step # 201: No).

[Other Embodiments]
In the above-described embodiment, the control unit 40 has been described as allowing the refrigerant to flow through the in-cylinder flow path 20 when the temperature of the refrigerant in the cylinder head 3 exceeds a preset in-cylinder threshold. Regardless of the relationship between the refrigerant temperature and the in-cylinder threshold value, the refrigerant can be circulated through the in-cylinder flow path 20.

  In addition, the heat exchanger flow path 30 includes a first heat exchanger flow path 31 that allows the refrigerant to flow through the heater 8B that warms the interior of the vehicle, and a second heat exchanger that allows the refrigerant to flow through a heat exchanger different from the heater 8B. Although described as being configured to be branched into the flow path 32, the heat exchanger flow path 30 may be configured without being branched.

  In the above-described embodiment, the control unit 40, when the warm-up of the engine 2 is completed, or when the temperature of the engine 2 rises with a gradient greater than a preset value during the warm-up of the engine 2. In the above description, the refrigerant is circulated from the cylinder head 3 to the cylinder block 4, but the control unit 40 sets the temperature of the engine 2 in advance while the engine 2 is warmed up even when the engine 2 is warmed up. It is also possible to configure so that the refrigerant is not circulated from the cylinder head 3 to the cylinder block 4 even in a situation where it rises with a gradient greater than the value.

  In the above-described embodiment, the EGR cooler 8A, the heater 8B, and the transmission heat exchanger 8C have been described as examples of the “heat exchanger 8 different from the radiator 5”, but other devices may be used. .

  The present invention can be used in an engine cooling device that cools an engine mounted on a vehicle.

1: Engine cooling device 2: Engine 3: Cylinder head 4: Cylinder block 5: Radiator 8: Heat exchanger 8B: Heater 10: Radiator flow path 20: Cylinder flow path 30: Heat exchanger flow path 31: First Heat exchanger channel 32: Second heat exchanger channel 40: Control unit

Claims (6)

A radiator flow path for circulating a refrigerant from a cylinder head of an engine mounted on the vehicle to the radiator;
A heat exchanger flow path through which the refrigerant flows from the cylinder head to a heat exchanger different from the radiator without passing through the radiator;
A controller that causes the refrigerant to flow through the heat exchanger flow path when the temperature of the refrigerant in the cylinder head exceeds a preset heat exchanger threshold when the engine is warmed up;
An engine cooling device comprising: An in-cylinder flow path through which the refrigerant flows from the cylinder head to the cylinder block;
2. The engine cooling device according to claim 1, wherein when the temperature of the refrigerant in the cylinder head exceeds a preset in-cylinder threshold value, the control unit causes the refrigerant to flow through the in-cylinder flow path. The heat exchanger flow path includes a first heat exchanger flow path through which the refrigerant flows through a heater that warms the interior of the vehicle, and a second heat exchanger flow path through which the refrigerant flows through a heat exchanger different from the heater. Branching into the road,
The control unit causes the refrigerant to flow through the second heat exchanger channel when there is no operation instruction of the heater and fuel is injected in the engine. The engine cooling device according to 1. The heat exchanger flow path includes a first heat exchanger flow path through which the refrigerant flows through a heater that warms the interior of the vehicle, and a second heat exchanger flow path through which the refrigerant flows through a heat exchanger different from the heater. Branching into the road,
4. The control unit according to claim 1, wherein the controller causes the refrigerant to flow through both the first heat exchanger flow channel and the second heat exchanger flow channel when there is an operation instruction for the heater. 5. The engine cooling device according to 1. The heat exchanger flow path includes a first heat exchanger flow path through which the refrigerant flows through a heater that warms the interior of the vehicle, and a second heat exchanger flow path through which the refrigerant flows through a heat exchanger different from the heater. Branching into the road,
When there is no operation instruction for the heater and fuel is not injected in the engine, the control unit is configured to both the first heat exchanger flow path and the second heat exchanger flow path. The engine cooling device according to any one of claims 1 to 4, wherein the flow of the refrigerant is stopped. An in-cylinder flow path through which the refrigerant flows from the cylinder head to the cylinder block;
When the engine warm-up is completed, or when the engine temperature rises with a gradient greater than a preset value during the engine warm-up, the control unit The engine cooling device according to any one of claims 1 to 4, wherein the refrigerant flows through the cylinder block.

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