JP2019081502A - Vehicle heat exchange system - Google Patents

Abstract

To provide a vehicle heat exchange system which can quickly increase temperature of a refrigerant without conducting engine operation during cold start.SOLUTION: A coolant circulating between an engine 11 and a radiator 32 conducts heat exchange with a transaxle 15 including a motor generator 12, which is provided separately from the engine 11, other than the engine 11 and the radiator 32. The heat exchange causes the coolant to receive waste heat from the transaxle 15 and increase its temperature.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat exchange system of a vehicle equipped with an engine as a drive source for traveling.

  Conventionally, a hybrid vehicle (HV: Hybrid Vehicle) equipped with an engine and a motor generator as drive sources for traveling is known.

  For example, in a split type (series parallel type) hybrid vehicle, the engine and motor generator are connected to a planetary gear mechanism, and power from the engine can be split and distributed to the motor generator and drive wheels. And the power from the motor generator can be synthesized and transmitted to the drive wheels. In addition, it is possible to stop the engine and perform EV travel using only the power from the motor generator.

  FIG. 4 is a view schematically showing a configuration of a cooling system of a conventional hybrid vehicle.

  In a conventional hybrid vehicle, an engine cooling system 102 for cooling an engine (E / G) 101 and a transaxle cooling system 104 for cooling a transaxle (T / A) 103 are separately provided. The transaxle 103 is a unit in which a motor generator is housed in a case together with a planetary gear mechanism and a differential gear.

  The engine cooling system 102 circulates the cooling water between the engine 101 and the radiator 106 by the operation of the water pump (W / P) 105. As coolant flows through the engine 101, heat exchange is performed between the coolant and the engine 101, the engine 101 is cooled, and the coolant is heated. Then, when the cooling water flowing through the engine 101 flows through the radiator 106, heat exchange is performed between the cooling water and the radiator 106, and the cooling water is cooled.

  A part of exhaust gas discharged from the engine 101 is re-intaken into the engine 101 through an EGR (Exhaust Gas Recirculation) passage. An EGR cooler 107 for cooling exhaust gas flowing through the EGR passage, a throttle body 108 for adjusting the amount of intake air to the engine 101, and a part of cooling water from the engine 101 to the radiator 106 It flows through the heater core 109 and joins with the cooling water flowing from the radiator 106 toward the water pump 105 by the thermostat valve 110. The thermostat valve 110 prevents the flow of the cooling water from the radiator 106 toward the water pump 105 when the temperature of the cooling water is lower than a predetermined temperature. Thus, when the temperature of the cooling water is equal to or lower than the predetermined temperature, the cooling water is circulated between the engine 101 and the EGR cooler 107 and the throttle body 108 and between the engine 101 and the heater core 109 without flowing through the radiator 106. Do. Cooling water passes through the EGR cooler 107 and heat exchange is performed between the cooling water and the EGR cooler 107, whereby the temperature rise of the cooling water is promoted.

  The transaxle cooling system 104 circulates cooling water between an oil cooler (O / C) 112 and a radiator 113 provided in the transaxle 103 by the operation of the water pump 111. Further, on the way from the radiator 113 to the oil cooler 112, the cooling water of the transaxle cooling system 104 flows through a PCU (Power Control Unit: Power Control Unit) 114 which incorporates an inverter or the like for driving the motor generator. Cooling water flows through the PCU 114 and the oil cooler 112 in this order, heat exchange is performed between the cooling water and the PCU 114 and the oil cooler 112, the PCU 114 and the oil cooler 112 are cooled, and the cooling water is heated. The cooling water flowing through the oil cooler 112 flows through the radiator 113, whereby heat exchange is performed between the cooling water and the radiator 113, and the cooling water is cooled.

JP 10-238345 A

  Since hybrid vehicles capable of EV travel often perform EV travel at the time of start or low speed travel, the temperature rise of the cooling water of the engine cooling system 102 tends to be slow at the time of cold start. When the temperature rise of the cooling water is slow, the undesirable condition such as the large friction of the engine 101 and the ineffectiveness of the heater of the air conditioner continue for a long time. If the engine 101 is operated, the temperature rise of the cooling water of the engine cooling system 102 can be accelerated, but the fuel consumption rate (fuel consumption rate) of the engine 101 is reduced.

  An object of the present invention is to provide a heat exchange system of a vehicle capable of rapidly raising the temperature of the refrigerant without operating the engine at the time of cold start.

  In order to achieve the above object, a heat exchange system of a vehicle according to the present invention is a heat exchange system which circulates a refrigerant between an engine and a radiator and exchanges heat between the engine and the radiator and the refrigerant. The refrigerant is configured to exchange heat between the refrigerant and a drive mechanism including a drive source provided separately from the engine.

  According to this configuration, the refrigerant circulating between the engine and the radiator exchanges heat with the drive mechanism including a drive source provided separately from the engine, in addition to the engine and the radiator. By this heat exchange, the refrigerant receives exhaust heat from the drive mechanism and rises in temperature.

  Therefore, the temperature of the refrigerant can be increased quickly without operating the engine at the time of cold start. As a result, it is possible to suppress a decrease in the fuel efficiency due to the operation of the engine for raising the temperature of the refrigerant. In addition, since the temperature of the engine can be raised quickly at the time of cold start, it can be suppressed that the state where the friction of the engine is large continues for a long time, and the fuel efficiency can be improved by reducing the friction loss. Furthermore, in the configuration in which the refrigerant flows through the heater core of the air conditioner, the temperature of the heater core can be raised quickly at the time of cold start, so that the ineffective state of the heater of the air conditioner can be prevented from continuing. Air conditioning comfort can be improved.

  The heat exchange system includes a first flow path in which the refrigerant flows from the engine toward the radiator, and a second flow path which is branched and connected to the first flow path and in which the refrigerant flows from the first flow path toward the drive mechanism; A refrigerant is inserted at a branch point between the first flow path and the second flow path, and when the temperature of the refrigerant is equal to or lower than a predetermined temperature, the refrigerant flowing from the upstream side flows through the second flow path. It is preferable to include a thermostat valve that causes the refrigerant flowing from the upstream side of the first flow path to flow to the downstream side of the first flow path when the temperature of is higher than a predetermined temperature.

  As a result, when the temperature of the refrigerant is lower than a predetermined temperature, such as during cold start, the refrigerant flows through the drive mechanism, so the temperature of the refrigerant can be raised by the exhaust heat from the drive mechanism. Then, when the temperature of the refrigerant becomes higher than the predetermined temperature, the refrigerant flows through the radiator, so that the refrigerant can be cooled.

  The drive source provided separately from the engine is a motor generator as a drive source for traveling the vehicle, and the drive mechanism transmits the power from the motor generator and the engine and the power from the motor generator to the left and right drive wheels. It may be a transaxle including a gear.

  The concept of “refrigerant” includes water, a mixture of water and ethylene glycol, water or a mixture of water and an additive, and is not limited to a liquid containing water (cooling water), Oil is also included.

  According to the present invention, since the temperature of the refrigerant can be raised promptly without operating the engine at the time of cold start, it is possible to suppress a decrease in fuel efficiency due to the operation of the engine. Since the temperature of the engine can be raised quickly by the rapid temperature rise of the refrigerant, the fuel efficiency can be improved by reducing the friction loss. In addition, since the temperature of the heater core can be raised promptly, the comfort of the air conditioning in the vehicle compartment can be improved.

It is a figure which shows the structure of the heat exchange system of the vehicle which concerns on one Embodiment of this invention diagrammatically, and shows the flow of the cooling water in the state below the temperature of 2nd preset temperature with a white arrow. It is a figure which shows the structure of the heat exchange system of the vehicle which concerns on one Embodiment of this invention diagrammatically, and the temperature of a cooling water whites the flow of the cooling water in the state below a 1st preset temperature higher than 2nd preset temperature. Indicated by a broken arrow. It is a figure which shows the structure of the heat exchange system of the vehicle which concerns on one Embodiment of this invention diagrammatically, and shows the flow of the cooling water in the state in which the temperature of a cooling water is higher than 1st preset temperature with a white arrow. FIG. 7 is a diagram schematically showing a configuration of a conventional hybrid vehicle cooling system.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

<Heat exchange system for hybrid vehicles>
FIGS. 1, 2 and 3 schematically show the configuration of a heat exchange system of a vehicle 1 according to an embodiment of the present invention.

  Vehicle 1 is, for example, a split type (series / parallel type) hybrid vehicle, and is equipped with engine 11 and motor generator 12 as a drive source for traveling.

  The engine 11 is, for example, a gasoline engine or a diesel engine. The vehicle 1 is provided with a throttle body 13 for adjusting the amount of intake air to the combustion chamber of the engine 11 in addition to the engine 11.

  Further, in the vehicle 1, an EGR (Exhaust Gas Recirculation) system is adopted. The EGR system is a system for recirculating a part of the exhaust gas discharged from the engine 11 to the engine 11, and includes an EGR passage through which the exhaust gas flows and an EGR valve for adjusting the flow rate of the exhaust gas flowing through the EGR passage. The EGR system is also provided with an EGR cooler 14 for cooling the exhaust gas flowing through the EGR passage.

  The motor generator 12 is a DC brushless motor, and has a function as a motor and a function as a generator. Motor generator 12 is housed in a case together with, for example, a planetary gear mechanism and a differential gear, and constitutes a transaxle (T / A) 15 for transmitting power to drive wheels. The transaxle 15 is provided with an oil cooler (O / C) 16 for cooling (or heating) the oil used in the transaxle 15. Further, the vehicle 1 is provided with a PCU (Power Control Unit) 17 that incorporates an inverter for driving the motor generator 12 and the like.

  In vehicle 1, for example, engine 11 and motor generator 12 are connected to a planetary gear mechanism, and the power from engine 11 can be divided and distributed to motor generator 12 and drive wheels. Further, the power from the engine 11 and the power from the motor generator 12 can be synthesized and transmitted to the drive wheels. In addition, it is possible to stop the engine 11 and perform EV travel using only the power from the motor generator 12.

  Here, although the configuration of the split system (series / parallel system) hybrid system has been described as an example, the system of the hybrid system is not limited to the split system, and may be, for example, a series system or a parallel system. It may be In the series system, the power of the engine is converted into electric power by the generator, the power generated by the generator is used to drive the drive motor, and the power of the drive motor is transmitted to the drive wheels. In the parallel system, the power of the engine and the power of the motor (motor generator) are transmitted to the drive wheels without the power split mechanism including the planetary gear mechanism.

  Further, in the vehicle 1, an engine cooling system 21 for cooling the engine 11 and a PCU cooling system 22 for cooling the PCU 17 are separately provided.

<Engine cooling system>
The engine cooling system 21 circulates cooling water (liquid containing water) between the engine 11, the transaxle 15 (oil cooler 16) and the radiator 32 by the operation of the water pump (W / P) 31.

  Specifically, one end of a first low temperature flow passage 34 is connected to an inlet 33 of a water jacket formed in the engine 11. The radiator 32 is provided with a first outlet 35 and a second outlet 36. The other end of the first low temperature flow passage 34 is connected to the first outlet 35 of the radiator 32. One end of a high temperature flow path 38 is connected to the outlet 37 of the water jacket of the engine 11. The other end of the high temperature flow path 38 is connected to the inlet 39 of the radiator 32. One end of a second low temperature flow passage 41 is connected to the second outlet 36 of the radiator 32. The second low temperature flow passage 41 passes through the oil cooler 16 and the heater core 42 of the air conditioner for air conditioning the passenger compartment in this order, and the other end is interposed in the middle of the first low temperature flow passage 34 Connected to the 43. The water pump 31 is located in the middle of the first low temperature flow passage 34 and interposed between the engine 11 and the first thermostat valve 43.

  When the water pump 31 is driven, the cooling water flows from the first low temperature flow passage 34 into the water jacket of the engine 11, and the cooling water flowing through the water jacket flows out to the high temperature flow passage 38. As the cooling water flows through the water jacket, heat exchange is performed between the cooling water and the engine 11, the engine 11 is cooled or heated, and the temperature of the cooling water is increased or decreased. The cooling water flowing through the high temperature flow path 38 flows into the radiator 32 from the inlet 39 of the radiator 32.

  In the radiator 32, a distribution unit 44 is formed as a space at a portion facing the inlet 39, and a collecting portion 45 is formed as a space at a portion facing the first outlet 35 and the second outlet 36. Further, in the radiator 32, a plurality of in-radius flow paths communicating with the distributing unit 44 and the collecting unit 45 are formed between the distributing unit 44 and the collecting unit 45. Further, in the collecting portion 45, a wall 46 is formed between the first outlet 35 and the second outlet 36. The wall 46 is disposed at a position closer to the second outlet 36 in the collecting portion 45, and the tip of the wall 46 is connected to the end on the collecting portion 45 side in the wall that defines the flow passage in the radiator. Thereby, the wall 46 is assembled into the first space 47 with the collecting portion 45 with respect to the wall 46 and the second space 48 with the second outlet 36 with respect to the wall 46. It divides | segments so that a cooling water may not go back and forth between the 2nd space 48. As shown in FIG. The flow passage in the radiator on the side of the first space 47 with respect to the wall 46 communicates with the first outlet 35 facing the first space 47 via the first space 47, and the side of the second space 48 on the wall 46 The radiator internal flow passage communicates with the second outlet 36 facing the second space 48 via the second space 48. The number of flow paths in the radiator communicating with the first outlet 35 is larger than the number of flow paths in the radiator communicating with the second outlet 36.

  The cooling water having flowed into the radiator 32 flows from the distribution unit 44 into the flow passage in each radiator, and flows through the flow passage in the radiator. A radiator fan 49 is provided opposite to the radiator 32. Cooling water flowing through the flow path in each radiator is cooled by air blowing from the radiator fan 49 mainly when the vehicle 1 is stopped. When the vehicle 1 travels, even if the radiator fan 49 is not operating, the cooling water flowing through the flow paths in each radiator is cooled by the traveling wind. Then, the cooling water flowing through a part of the radiator inner flow path flows out of the radiator inner flow path into the first space 47 of the collecting portion 45 and further flows out of the first outlet 35 into the first low temperature flow path 34. The cooling water flowing through the other part of the radiator inner flow path flows out of the radiator inner flow path into the second space 48 of the collecting portion 45 and further flows out of the second outlet 36 into the second low temperature flow path 41.

  The cooling water flowing through the second low temperature flow passage 41 passes through the oil cooler 16 and the heater core 42 in this order. When the cooling water passes through the oil cooler 16, heat exchange is performed between the cooling water and the oil cooler 16, the oil cooler 16 is cooled or heated, and the temperature of the cooling water is increased or decreased. Further, when the cooling water passes through the heater core 42, heat exchange is performed between the cooling water and the heater core 42, the heater core 42 is heated, and the temperature of the cooling water is lowered. Then, the cooling water that has passed through the heater core 42 flows into the first low temperature flow passage 34 via the first thermostat valve 43 and joins the cooling water flowing through the first low temperature flow passage 34.

  A second thermostat valve 51 is interposed in the middle of the high temperature passage 38. One end of a first branch passage 52 is connected to the second thermostat valve 51. The other end of the first branch passage 52 is a middle part of the second low temperature flow passage 41 and is connected between the oil cooler 16 and the radiator 32.

  Further, one end of a second branch passage 53 is branched and connected from the high temperature flow passage 38 between the engine 11 and the second thermostat valve 51 in the middle of the high temperature flow passage 38. The second branch passage 53 passes through the EGR cooler 14 and the throttle body 13 in this order, and the other end of the second branch passage 53 is an intermediate portion of the second low temperature flow passage 41 and the heater core 42 and the first thermostat valve Connected between 43 and.

  The cooling water flowing through the second branch passage 53 passes through the EGR cooler 14 and the throttle body 13 in this order, and then flows into the second low temperature flow passage 41 and joins the cooling water flowing through the second low temperature flow passage 41. When the coolant passes through the EGR cooler 14, heat exchange is performed between the coolant and the EGR cooler 14 (exhaust gas flowing through the EGR passage), and the EGR cooler 14 is cooled or heated, and the coolant is raised. Warm or cool. Further, when the coolant passes through the throttle body 13, the throttle body 13 receives heat from the coolant and the throttle body 13 is heated.

  Further, a reserve tank (R / T) 55 is connected to the radiator 32 via a pressure control valve 54. When the pressure in the radiator 32 rises, the main pressure valve of the pressure regulating valve 54 is opened, and the coolant in the radiator 32 flows into the reserve tank 55 and is stored. When the pressure in the radiator 32 decreases, the negative pressure valve of the pressure regulating valve 54 is opened, and the coolant in the reserve tank 55 is supplied into the radiator 32.

<Operation of thermostat valve>
The first thermostat valve 43 blocks the cooling water flowing through the first low temperature flow passage 34 when the temperature of the cooling water is equal to or lower than the first set temperature, and the cooling water flowing through the second low temperature flow passage 41 accept. On the other hand, in a state where the temperature of the cooling water is higher than the first set temperature, the first thermostat valve 43 controls the cooling water flowing through the first low temperature flow passage 34 and the cooling water flowing through the second low temperature flow passage 41. Accept both.

  The second thermostat valve 51 receives the cooling water flowing through the high temperature flow passage 38 in a state where the temperature of the cooling water is equal to or lower than the second set temperature, and causes the cooling water to flow out to the first branch passage 52. On the other hand, in the state where the temperature of the cooling water is higher than the second set temperature, the second thermostat valve 51 receives the cooling water flowing through the high temperature flow passage 38 and places the cooling water downstream of the high temperature flow passage 38 Let out.

  The first set temperature is set to a temperature higher than the second set temperature.

  When the temperature of the cooling water is equal to or lower than the second set temperature, when the water pump 31 is driven, the cooling water flowing out of the water jacket of the engine 11 into the high temperature passage 38 as shown by the outlined arrow in FIG. Flows into the first branch passage 52 via the second thermostat valve 51, and the cooling water flowing through the first branch passage 52 flows into the second low temperature flow passage 41. Since the wall 46 is provided in the radiator 32, the cooling water in the second low temperature flow passage 41 is not sucked into the radiator 32 even if the water pump 31 is driven. Therefore, the cooling water having flowed into the second low temperature flow passage 41 flows toward the oil cooler 16 through the second low temperature flow passage 41, and passes from the second low temperature flow passage 41 via the oil cooler 16 and the heater core 42. It flows into the first low temperature flow passage 34 through the thermostat valve 43. Accordingly, when the temperature of the cooling water is equal to or lower than the second set temperature, the cooling water circulates between the engine 11 and the oil cooler 16, and the cooling water does not flow through the radiator 32. Therefore, the temperature of the cooling water rises rapidly.

  Under the condition that the temperature of the cooling water is higher than the second set temperature but not higher than the first set temperature, the cooling water flowing out from the water jacket of the engine 11 into the high temperature flow path 38 as shown by the outlined arrow in FIG. The coolant flowing into the downstream side of the high temperature flow passage 38 via the second thermostat valve 51 and flowing through the high temperature flow passage 38 flows into the radiator 32. Since the first thermostat valve 43 blocks the flow of the cooling water between the radiator 32 and the first thermostat valve 43 in the first low temperature flow passage 34, the cooling water having flowed into the radiator 32 is It flows out to the second low temperature channel 41. The cooling water flowing through the second low temperature flow passage 41 flows from the second low temperature flow passage 41 into the first low temperature flow passage 34 via the first thermostat valve 43 via the oil cooler 16 and the heater core 42. Thus, when the temperature of the cooling water is equal to or lower than the first set temperature, the cooling water flowing out of the radiator 32 is supplied to the engine 11 after passing through the oil cooler 16 and the heater core 42.

  When the temperature of the cooling water is higher than the first set temperature, the cooling water flowing out of the water jacket of the engine 11 into the high temperature flow passage 38 passes through the second thermostat valve 51 as shown by the white arrow in FIG. Cooling water flowing downstream of the high temperature flow passage 38 and flowing through the high temperature flow passage 38 flows into the radiator 32. Since the first thermostat valve 43 is in a state of receiving both the cooling water flowing through the first low temperature flow passage 34 and the cooling water flowing through the second low temperature flow passage 41, the cooling water flowing into the radiator 32 is The radiator 32 flows out to both the first low temperature flow passage 34 and the second low temperature flow passage 41. The cooling water flowing through the first low temperature flow passage 34 passes through the first thermostat valve 43 and flows into the water jacket of the engine 11 from the first low temperature flow passage 34. On the other hand, the cooling water flowing through the second low temperature flow passage 41 flows from the second low temperature flow passage 41 into the first low temperature flow passage 34 through the first thermostat valve 43 through the oil cooler 16 and the heater core 42. The first low temperature flow passage 34 joins the cooling water flowing from the radiator 32. Thus, when the temperature of the cooling water is higher than the first set temperature, the cooling water flowing out of the radiator 32 is supplied in parallel to the engine 11 and the oil cooler 16. Therefore, the engine 11 and the oil cooler 16 are effectively cooled by the cooling water.

<PCU cooling system>
The PCU cooling system 22 circulates the cooling water between the PCU 17 and the radiator 62 by the operation of the water pump (W / P) 61.

  Specifically, the PCU cooling system 22 includes a circulation path 63 through which the cooling water flows. One end of the circulation path 63 is connected to the inlet 64 of the radiator 62, the middle part is connected via the PCU 17, and the other end is connected to the outlet 65 of the radiator 62. The water pump 61 is interposed between a portion of the circulation path 63 via the PCU 17 and the inlet 64 of the radiator 62. Further, in the circulation path 63, a reserve tank (R / T) 66 for storing cooling water is interposed between a portion passing through the PCU 17 and the water pump 61.

  When the water pump 61 is driven, cooling water is sucked from the reserve tank 66, and the cooling water flows through the circulation path 63. The cooling water flows from the circulation path 63 into the radiator 62 through the inlet 64 of the radiator 62, and the cooling water flows in the radiator 62 from the inlet 64 toward the outlet 65. A radiator fan 67 is provided opposite to the radiator 62, and the cooling water flowing through the inside of each radiator 62 is cooled by air blowing from the radiator fan 67 mainly when the vehicle 1 is stopped. When the vehicle 1 travels, even if the radiator fan 49 is not operating, the cooling water flowing through the flow paths in each radiator is cooled by the traveling wind. Then, the cooling water flowing in the radiator 62 flows out from the outlet 65 into the circulation path 63. The cooling water flowing out from the outlet 65 of the radiator 62 to the circulation path 63 exchanges heat with the PCU 17 when passing through the PCU 17. By this heat exchange, the PCU 17 is cooled and the temperature of the cooling water is raised. The cooling water passing through the PCU 17 flows into the reserve tank 66.

  The temperature of the cooling water circulating through the PCU cooling system 22 is lower than the temperature of the cooling water circulating through the engine cooling system 21. That is, since PCU 17 is less susceptible to heat than engine 11 and transaxle 15, engine cooling system 21 is such that the temperature of the cooling water after passing engine 11 becomes a predetermined first temperature (for example, about 105 ° C.) The PCU cooling system 22 is designed such that the temperature of the cooling water after passing through the PCU 17 is a second temperature (e.g., 65.degree. C.) lower than the first temperature.

<Function effect>
As described above, the cooling water circulating between the engine 11 and the radiator 32 exchanges heat with the transaxle 15 including the motor generator 12 provided separately from the engine 11 in addition to the engine 11 and the radiator 32. By this heat exchange, the cooling water receives exhaust heat from the transaxle 15 and is heated.

  Therefore, even if the engine 11 is not operated at the time of cold start, the temperature of the cooling water can be raised promptly. As a result, it is possible to suppress a decrease in the fuel efficiency due to the operation of the engine 11 for raising the temperature of the cooling water. Further, since the temperature of the engine 11 can be raised quickly at the time of cold start, it can be suppressed that the state where the friction of the engine 11 is large continues for a long time, and the fuel efficiency can be improved by the reduction of friction loss. Furthermore, since the cooling water that rapidly raises its temperature passes through the heater core 42 of the air conditioner, the temperature of the heater core 42 can be raised quickly at the time of cold start. As a result, the heater of the air conditioner is not effective. It is possible to suppress the continuation of the state, and to improve the comfort of the air conditioning in the passenger compartment.

  Further, as a flow path flowing from the radiator 32 to the engine 11, a first low temperature flow path 34 and a second low temperature flow path 41 are separately provided. At the downstream end of the radiator 32 in the flow direction of the cooling water, a wall 46 is provided for dividing the cooling water flowing from the upstream side into the first low temperature flow passage 34 and the second low temperature flow passage 41. Thereby, even if there is only one inflow path which makes cooling water flow in to radiator 32, the cooling water which circulates radiator 32 can be divided and flowed to the 1st low temperature channel 34 and the 2nd low temperature channel 41. Therefore, the inflow passage for the first low temperature flow passage 34 and the inflow passage for the second low temperature flow passage 41 may be provided separately and not connected to the radiator 32. Therefore, the circuit configuration of the engine cooling system 21 is simple, and the engine cooling system 21 can be configured inexpensively.

<Modification>
As mentioned above, although one Embodiment of this invention was described, this invention can also be implemented with another form.

  For example, by using the oil used in the transaxle 15 also for the engine 11, it is possible to achieve quicker temperature rise of the engine 11 at the time of cold start.

  The number of motor generators 12 mounted on the transaxle 15 may be one, or two or more. Further, the drive source included in the transaxle 15 is not limited to the motor generator 12, and may be a simple motor, or is not limited to the drive source for traveling the vehicle 1, and may be a heat source such as an electric compressor of an air conditioner. As long as the driving source is

  In addition, various design changes can be made to the above-described configuration within the scope of the matters described in the claims.

1: Vehicle 11: Engine 12: Motor generator (drive source)
15: Transaxle (drive mechanism)
21: Engine cooling system (heat exchange system)
32: Radiator

Claims (1)

A heat exchange system which circulates a refrigerant between an engine and a radiator and exchanges heat between the engine and the radiator and the refrigerant,
A heat exchange system of a vehicle, wherein the refrigerant is configured to exchange heat with a drive mechanism including a drive source provided separately from the engine.

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