Cooling device

Abstract

A cooling device, the cooling device includes a first refrigerant circuit (10) and a second refrigerant circuit (20), the second refrigerant circuit (20) includes a connecting flow path (21), a first flow path (22) and a second flow path (23) that branch out in parallel, a converging flow path (24), a first branch path (25) and a second branch path (26), an inverter (63) and an intercooler (33) are serially arranged in the first flow path (22), a turbocharger (31) is arranged in the second flow path (23), the first branch path (25) connects the converging flow path (24) and the radiator (65), the second branch path (26) connects the converging flow path (24) and the connecting flow path (21), and a flow rate adjusting device (67) is arranged at the branch portion where the first branch path (25) and the second branch path (26) branch out from the converging flow path (24).

Description

Technical Field

[0001] The present disclosure relates to a cooling device for cooling a power source of a hybrid vehicle. Background Art

[0002] Conventionally, various hybrid vehicles have been proposed that include a cooling system for cooling an inverter that controls a traveling electric motor and a cooling system for cooling an intercooler.

[0003] Japanese Patent Application Laid-Open No. 2014-83918 discloses a cooling device that combines a cooling system for cooling an inverter that controls a traveling electric motor and a cooling system for cooling an intercooler in a hybrid vehicle. Summary of the Invention

[0004] However, in the cooling device disclosed in Japanese Patent Application Laid-Open No. 2014-83918, the case of combining a cooling system for a supercharger with a cooling system for cooling an inverter and a cooling system for cooling an intercooler has not been sufficiently considered.

[0005] In the case of combining a cooling system for a supercharger with a cooling system for cooling an inverter and a cooling system for cooling an intercooler, it is required to circulate the refrigerant in consideration of the temperature of the refrigerant.

[0006] The present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide a cooling device capable of controlling a refrigerant flow path in a cooling device obtained by combining a cooling system for cooling an inverter, a cooling system for cooling an intercooler, and a cooling system for a supercharger.

[0007] The cooling device based on the present disclosure is applied to a hybrid vehicle that travels with at least one of an internal combustion engine equipped with a supercharger and a driving electric motor whose supply electrodes are regulated by an inverter as a power source for vehicle travel. The above cooling device includes: a first refrigerant circuit in which a first refrigerant for cooling the above internal combustion engine circulates; and a second refrigerant circuit that is independently provided with respect to the above first refrigerant circuit, and a second refrigerant circulates in the second refrigerant circuit. The above second refrigerant circuit is provided in a manner that connects a radiator, a pump, the above inverter, an intercooler, and a turbocharger. The radiator can cool the above second refrigerant through heat exchange with external gas. The pump is used to circulate the above second refrigerant in the above second refrigerant circuit. The intercooler exchanges heat between the intake air pressurized by the above supercharger and the refrigerant. The turbocharger is included in the above supercharger. The above inverter, the above intercooler, and the above turbocharger are arranged on the downstream side of the pump in the flow direction of the above second refrigerant. The radiator is arranged on the upstream side of the pump in the above flow direction. The above second refrigerant circuit includes a connection flow path that connects the above radiator and the above pump, a first flow path and a second flow path that branch in parallel on the downstream side of the pump, a confluence flow path where the above first flow path and the above second flow path converge, a first branch path and a second branch path that branch from the above confluence flow path. The above inverter and the above intercooler are serially provided in the above first flow path. The above turbocharger is provided in the above second flow path. The above first branch path connects the above confluence flow path and the above radiator, and the above second branch path connects the above confluence flow path and the above connection flow path in a manner that allows the above second refrigerant to bypass the above radiator. A flow rate regulating device is provided at the branch point where the above confluence flow path branches into the above first branch path and the above second branch path, and the flow rate regulating device regulates the flow rate of the above second refrigerant flowing from the above confluence flow path to the above first branch path and the flow rate of the above second refrigerant flowing from the above confluence flow path to the above second branch path.

[0008] According to the above structure, the pump is driven in the second refrigerant circuit, whereby the second refrigerant circulates in the second refrigerant circuit. The second refrigerant cooled by the radiator is divided into the second refrigerant flowing to the first flow path and the second refrigerant flowing to the second flow path on the downstream side of the pump.

[0009] The second refrigerant flowing to the first flow path cools the inverter and the intercooler. The second refrigerant flowing to the second flow path 23 cools the turbocharger. The second refrigerant flowing through the first flow path and the second flow path converges at the confluence flow path.

[0010] The flow rate of the second refrigerant after being combined in the confluent flow path is adjusted by the flow rate adjusting device, and the second refrigerant flows in the first branch path and / or the second branch path. The second refrigerant flowing toward the first branch path is introduced into the radiator and cooled. The second refrigerant flowing toward the second branch path bypasses the radiator and is introduced into the connection flow path.

[0011] Thus, by branching from the confluent flow path into the first branch path and the second branch path, for example, when the temperature of the second refrigerant is low due to the influence of the ambient temperature or the like, the second refrigerant heated by heat exchange with the inverter, the intercooler, and the turbocharger can mainly flow into the second branch path. In this case, since the second refrigerant can circulate in the second refrigerant circuit without being cooled by the radiator, condensation or freezing in the intercooler can be suppressed. In addition, since the temperature of the second refrigerant increases, the viscosity of the second refrigerant decreases, and the power consumption of the pump can be reduced. Moreover, by making the second refrigerant flow into the second branch path, the flow path length of the second refrigerant circuit in which the second refrigerant circulates can be shortened, so that the flow resistance of the second refrigerant can be reduced.

[0012] On the other hand, when the temperature of the second refrigerant is high, the refrigerant mainly flows into the first branch path, whereby the cooled second refrigerant can circulate in the second refrigerant circuit. Thereby, the inverter, the intercooler, and the turbocharger can be efficiently cooled.

[0013] As described above, in the above cooling device, the refrigerant flow path can be controlled in the cooling device in which the cooling system for cooling the inverter, the cooling system for cooling the intercooler, and the cooling system for the supercharger are combined.

[0014] In the above cooling device based on the present disclosure, the flow rate adjusting device can switch between a first state in which the second refrigerant flows from the confluent flow path to the first branch path and a second state in which the second refrigerant flows from the confluent flow path to the second branch path.

[0015] According to the above structure, the first state and the second state can be switched. In the first state, the second refrigerant does not flow into the second branch path but only into the first branch path, so that the second refrigerant can be cooled by the radiator. In the second state, the second refrigerant does not flow into the first branch path but only into the second branch path, so that when the temperature of the second refrigerant is low, the second refrigerant can circulate in the second refrigerant circuit without being cooled.

[0016] The above-described cooling device based on the present disclosure may include a control unit that controls the operation of the above-described flow rate adjustment device, and a temperature estimation unit that estimates the temperature of the second refrigerant flowing into the first flow path and the second flow path. In this case, the control unit controls the operation of the flow rate adjustment device such that when the temperature estimated by the temperature estimation unit is equal to or higher than a set threshold value, it enters the first state, and when the temperature estimated by the temperature estimation unit is less than the set threshold value, it enters the second state.

[0017] According to the above structure, the control unit can control the flow rate adjustment device based on the temperature information estimated by the temperature estimation unit. As a result, the first state and the second state can be switched with high precision.

[0018] In the above-described cooling device based on the present disclosure, the flow rate adjustment device may be a thermostat. In this case, when the temperature of the second refrigerant flowing in the converging flow path is equal to or higher than a specified threshold value, it enters the first state, and when the temperature of the second refrigerant flowing in the converging flow path is less than the specified threshold value, it enters the second state.

[0019] According to the above structure, by using a thermostat for the flow rate adjustment device, it is not necessary to electronically control the flow rate adjustment device. Therefore, the structure of the cooling device and the control of the flow rate adjustment device can be simplified.

[0020] The above and other objects, features, aspects, and advantages of the present invention will become apparent from the following detailed description of the invention, which is understood in connection with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a configuration diagram showing the cooling device of the embodiment.

[0022] Figure 2 It is a configuration diagram showing the cooling device of Reference Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. It should be noted that in the embodiments shown below, the same or common parts are denoted by the same reference numerals in the drawings, and the description thereof will not be repeated.

[0024] (Embodiment)

[0025] Figure 1 It is a configuration diagram showing the cooling device of the embodiment. Refer to Figure 1 , and the cooling device 100 of the embodiment will be described.

[0026] As Figure 1As shown, the cooling device 100 of the embodiment is applied to a hybrid vehicle that travels using at least one of an internal combustion engine 30 equipped with a supercharger and a driving electric motor 70 whose supply power is regulated by an inverter 63 as a power source for vehicle travel.

[0027] The driving force output from the internal combustion engine 30 is used not only for vehicle travel but also to operate a generator. The electric power generated by the generator and the electric power supplied from an external power source can be stored in a power storage device. In addition, the electric power stored in the power storage device is supplied not only to the driving electric motor but also to various in-vehicle devices.

[0028] The cooling device 100 includes a first refrigerant circuit 10 and a second refrigerant circuit 20. The first refrigerant for cooling the internal combustion engine 30 equipped with a turbocharger 31 as a supercharger circulates in the first refrigerant circuit 10. The second refrigerant circuit 20 is provided independently of the first refrigerant circuit 10, and the second refrigerant circulates in the second refrigerant circuit 20. It should be noted that the first refrigerant is, for example, cooling water, and the second refrigerant is also, for example, cooling water. Preferably, the temperature of the second refrigerant is lower than the temperature of the first refrigerant.

[0029] The first refrigerant circuit 10 is arranged to connect a radiator 55, a reservoir tank 51, a thermostat 52, a pump 53, the internal combustion engine 30, a heater core 54, etc.

[0030] The radiator 55 cools the first refrigerant by causing the blown air (external gas) blown from the cooling fan 90 to exchange heat with the first refrigerant flowing in the radiator 55. The reservoir tank 51 is a tank that accumulates the remaining first refrigerant.

[0031] The thermostat 52 regulates the flow rate of the first refrigerant cooled by the radiator 55 and flowing to the internal combustion engine 30 via the pump 53 as described later, and the flow rate of the first refrigerant heated by the internal combustion engine 30 and flowing to the internal combustion engine 30 via the pump 53 without passing through the radiator 55.

[0032] The pump 53 is an electric pump that sucks and discharges the first refrigerant. It should be noted that the pump 53 can be a belt-driven pump that is driven by power-transmitting the driving force of the internal combustion engine 30 via a belt. The heater core 54 is used to heat the vehicle interior and dissipates the heat of the first refrigerant after passing through the internal combustion engine 30.

[0033] The first refrigerant circuit 10 includes a plurality of paths 11a, 11b, 12, 13, 14, 15. The path 11a sequentially connects the radiator 55, the reservoir 51, and the thermostat 52. The path 11b is disposed in the internal combustion engine 30 and is connected to the path 11a via the pump 53. The first refrigerant flowing in the path 11b cools a water-cooled jacket (not shown) provided in the internal combustion engine 30 and the like.

[0034] The path 11b led out from the discharge port 34 provided in the internal combustion engine 30 to the outside of the internal combustion engine 30 branches into a path 12, a path 13, and a path 14.

[0035] The path 12 connects the path 11b led out from the discharge port 34 to the radiator 55. The path 13 is arranged to pass through the heat exchanger 37 which is used for heat exchange with the ATF (Automatic Transmission Fluid) described later. The path 14 is arranged to pass through the heater core 54.

[0036] The path 13 and the path 14 converge to form a path 15. The path 15 functions as a bypass flow path bypassing the radiator 55 and is arranged to face the thermostat 52.

[0037] In the first refrigerant circuit 10, by driving the pump 53, the first refrigerant can be circulated in the first refrigerant circuit 10. At this time, as described above, the thermostat 52 can be used to adjust the flow rate of the first refrigerant cooled by the radiator 55 and introduced into the internal combustion engine 30, and the flow rate of the first refrigerant passing through the path 15 and introduced into the internal combustion engine 30. Thereby, the temperature of the first refrigerant flowing in the internal combustion engine 30 can be adjusted.

[0038] A transmission 35 is mounted on the internal combustion engine 30. The transmission 35 is, for example, an automatic transmission. A circulation path 40 for circulating the ATF is provided in the transmission 35. The ATF circulates in the circulation path 40 by means of the MOP (Mechanical Oil Pump) 36. The above-mentioned heat exchanger 37 is arranged in the circulation path 40. When the ATF passes through the heat exchanger 37, it exchanges heat with the first refrigerant flowing in the above-mentioned path 13.

[0039] The second refrigerant circuit 20 is arranged to connect the radiator 65, the reservoir 61, the pump 62, the inverter 63, the oil cooler 64, the intercooler 33, and the turbocharger 31.

[0040] The radiator 65 causes the supply air (outside air) blown from the cooling fan 90 to exchange heat with the second refrigerant flowing within the radiator 65, thereby cooling the second refrigerant. The radiator 65 is disposed in front of the radiator 55. It should be noted that a radiator 80 is disposed in front of the radiator 65, and the radiator 80 forms part of the cooling system for the vehicle air conditioner.

[0041] The reservoir tank 61 is a tank that accumulates the surplus second refrigerant. The pump 62 is an electric pump that sucks in and discharges the second refrigerant. The pump 62 causes the second refrigerant to circulate in the second refrigerant circuit 20.

[0042] The inverter 63 is a power conversion unit that converts the DC power supplied from the power storage device into AC power and outputs it to the drive electric motor 70.

[0043] The oil cooler 64 is provided so as to be able to exchange heat between the drive electric motor 70 and the second refrigerant. For example, the oil cooler 64 cools the drive electric motor 70 by exchanging heat between the oil for cooling the drive electric motor and the second refrigerant. It should be noted that the oil cooler 64 may not be provided and a water-cooling jacket may be provided in the drive electric motor 70. In this case, the drive electric motor 70 is directly cooled by the second refrigerant flowing in the water-cooling jacket. The drive electric motor 70 can be miniaturized by being cooled strongly as described above, and the cost price and mass can be reduced.

[0044] The turbocharger 31 is a supercharger that uses the residual energy of the exhaust gas of the internal combustion engine 30 to rotate a turbine (not shown) and supercharges the intake air of the internal combustion engine 30. The intercooler 33 is an intake air cooler that exchanges heat between the supercharged intake air that has been compressed by the turbocharger 31 and has become high temperature and the second refrigerant to cool the supercharged intake air.

[0045] The second refrigerant circuit 20 includes a connecting flow path 21, a first flow path 22 and a second flow path 23 branched from the connecting flow path 21, a converging flow path 24 where the first flow path 22 and the second flow path 23 converge, and a first branch path 25 and a second branch path 26 branched from the converging flow path 24.

[0046] The connecting flow path 21 connects the radiator 65 and the pump 62. Specifically, the connecting flow path 21 connects the reservoir tank 61 and the pump 62 in sequence along the flow direction of the second refrigerant. The connecting flow path 21 branches into the first flow path 22 and the second flow path 23 in parallel on the downstream side of the pump 62 in this flow direction.

[0047] The inverter 63, the oil cooler 64, and the intercooler 33 are disposed in series in the first flow path 22. The turbocharger 31 is disposed in the second flow path 23.

[0048] In addition, a flow rate regulating device 66 is provided in the second flow path 23, and the flow rate regulating device 66 regulates the flow rate of the second refrigerant flowing toward the turbocharger 31. The flow rate of the second refrigerant flowing toward the turbocharger can be appropriately controlled by the flow rate regulating device 66.

[0049] The flow rate regulating device 66 can use, for example, a throttle valve, a solenoid valve, etc. When a throttle valve is used as the flow rate regulating device 66, electronic control is not required, and the structure and the control of the flow rate can be simplified.

[0050] The first flow path 22 and the second flow path 23 converge to form a converging flow path 24. As described above, the converging flow path 24 branches into a first branch path 25 and a second branch path 26.

[0051] The first branch path 25 connects the converging flow path 24 to the radiator 65. The second branch path 26 connects the converging flow path 24 to the connection flow path 21 in such a manner that the second refrigerant bypasses the radiator 65. The second branch path 26 is connected to the connection flow path 21 at a portion between the radiator 65 and the pump 62, more specifically, is connected to the connection flow path 21 on the upstream side of the reservoir tank 61.

[0052] A flow rate regulating device 67 is provided at the branch portion where the converging flow path 24 branches into the first branch path 25 and the second branch path 26. The flow rate regulating device 67 regulates the flow rate of the second refrigerant flowing from the converging flow path 24 to the first branch path 25 and the flow rate of the second refrigerant flowing from the converging flow path 24 to the second branch path 26.

[0053] The flow rate regulating device 67 can switch between a first state in which the second refrigerant flows from the converging flow path 24 to the first branch path 25 and a second state in which the second refrigerant flows from the converging flow path 24 to the second branch path 26.

[0054] In the first state, the second refrigerant does not flow to the second branch path 26 but only to the first branch path 25, so that the second refrigerant can be cooled by the radiator 65. In the second state, the second refrigerant does not flow to the first branch path 25 but only to the second branch path 26, so that when the temperature of the second refrigerant is low, the second refrigerant can be circulated in the second refrigerant circuit 20 without being cooled.

[0055] The flow rate regulating device 67 is constituted by, for example, a three-way valve or two solenoid valves, etc. The cooling device 100 includes a control unit 95 that controls the operation of the flow rate regulating device 67. The control unit 95 includes a temperature estimation unit 96 and is configured to be able to estimate the temperature of the second refrigerant flowing toward the first flow path 22 and the second flow path 23 using information detected by various sensors, etc.

[0056] For example, the temperature estimation unit 96 may estimate the temperature of the second refrigerant based on the temperature information of the outside air detected by a temperature sensor that measures the temperature of the outside air of the vehicle. In this case, the temperature sensor may measure the temperature of the outside air in a state where the internal combustion engine 30 is stopped or in a state where it starts operating. Further, the temperature estimation unit 96 may estimate the temperature of the second refrigerant based on the operating conditions of the internal combustion engine 30 or the like.

[0057] The control unit 95 controls the operation of the flow rate adjustment device 67 based on the temperature information estimated by the temperature estimation unit 96, whereby the first state and the second state can be switched with high accuracy.

[0058] It should be noted that in the above, the case where the flow rate adjustment device 67 is electrically controlled has been illustrated and described, but it is not limited thereto. The flow rate adjustment device 67 may be a thermostat. In this case, the flow rate adjustment device 67 may not be electrically controlled, whereby the control unit 95 can be omitted. Further, the structure and control of the flow rate adjustment device 67 can be simplified.

[0059] By driving the pump 62, the second refrigerant circulates in the second refrigerant circuit 20. The second refrigerant cooled by the radiator 65 is divided into a second refrigerant flowing to the first flow path 22 and a second refrigerant flowing to the second flow path 23 on the downstream side of the pump 62.

[0060] The second refrigerant flowing to the first flow path 22 cools the inverter 63, the oil cooler 64, and the intercooler 33. The second refrigerant flowing to the second flow path 23 cools the turbocharger 31. The second refrigerant that has flowed through the first flow path 22 and the second flow path 23 converges at the converging flow path 24.

[0061] The flow rate of the second refrigerant that has converged at the converging flow path 24 is adjusted by the flow rate adjustment device 67 and flows in the first branch path 25 and / or the second branch path 26. The second refrigerant flowing to the first branch path 25 is introduced into the radiator 65 and cooled. The second refrigerant flowing to the second branch path 26 bypasses the radiator 65 and is introduced into the connection flow path 21.

[0062] It should be noted that the maximum flow rate of the second refrigerant flowing in the connection flow path 21 is, for example, about 11 L / min. The maximum flow rate of the second refrigerant flowing in the first flow path 22 is, for example, about 10 L / min, and the maximum flow rate of the second refrigerant flowing in the second flow path 23 is, for example, about 1 L / min.

[0063] As described above, in the second refrigerant circuit 20, the confluent flow path 24 branches into a first branch path 25 and a second branch path 26. Thus, for example, when the temperature of the second refrigerant is low due to the influence of the ambient temperature or the like, the second refrigerant heated by heat exchange with the inverter 63, the intercooler 33, and the turbocharger 31 can mainly flow into the second branch path 26. In this case, since the second refrigerant can circulate in the second refrigerant circuit 20 without being cooled by the radiator 65, condensation or freezing in the intercooler 33 can be suppressed. In addition, since the temperature of the second refrigerant rises, the viscosity of the second refrigerant decreases, and the power consumption of the pump 62 can be reduced. Moreover, by making the second refrigerant flow in the second branch path 26, the flow path length of the second refrigerant circuit 20 through which the second refrigerant circulates can be shortened, so that the flow resistance of the second refrigerant can be reduced. Also, the ATF can be heated by the oil cooler, and the fuel utilization rate is improved due to the decrease in frictional force accompanying the decrease in viscosity.

[0064] On the other hand, when the temperature of the second refrigerant is high, the refrigerant mainly flows into the first branch path 25, whereby the cooled second refrigerant can circulate in the second refrigerant circuit 20. Thereby, the inverter 63, the intercooler 33, and the turbocharger 31 can be efficiently cooled.

[0065] As described above, in the cooling device 100, in the cooling device in which the cooling system for cooling the inverter 63, the cooling system for cooling the intercooler 33, and the cooling system for the supercharger are combined, the refrigerant flow path can be controlled.

[0066] (Reference Example)

[0067] Figure 2 It is a configuration diagram of the cooling device of the reference example. Refer to Figure 2 , and the cooling device 100A of the reference example will be described.

[0068] As Figure 2 shown, compared with the cooling device 100 of the embodiment, the structure of the second refrigerant circuit 20A of the reference example is different. The other structures are substantially the same.

[0069] In the second refrigerant circuit 20A, the first flow path 22 branches into a first branch path 221 and a second branch path 222 in parallel on the downstream side of the inverter 63 (more specifically, directly below the oil cooler 64).

[0070] The intercooler 33 is arranged in the first branch path 221. The second branch path 222 functions as a bypass path that bypasses the intercooler 33.

[0071] The second flow path 23, the first branch path 221, and the second branch path 222 converge to form a converging flow path 24. The converging flow path 24 is connected to the radiator 65 without branching. That is, compared with the embodiment, a branch path bypassing the radiator 65 is not provided in the second refrigerant circuit 20A.

[0072] A flow rate adjusting device 67 is provided at the branch portion where the first flow path 22 branches into the first branch path 221 and the second branch path 222.

[0073] The flow rate adjusting device 67 adjusts the flow rate of the second refrigerant flowing from the first flow path 22 to the first branch path 221 and the flow rate of the second refrigerant flowing through the second branch path 222 from the first flow path 22.

[0074] In the reference example, for example, when the temperature of the second refrigerant is low, the flow rate adjusting device 67 causes the second refrigerant not to flow to the first branch path 221 but to the second branch path 222. Thereby, condensation and freezing in the intercooler 33 can be prevented, and the power consumption of the pump 62 can be reduced.

[0075] On the other hand, when there is no supercharging or when the heat dissipation required by the intercooler 33 is small, such as during light load of the internal combustion engine 30, the flow rate adjusting device 67 causes the second refrigerant to flow to both the first branch path 221 and the second branch path 222. Thereby, the pressure loss of the second refrigerant can be reduced, and the power consumption of the pump 62 can be lowered.

[0076] Although the embodiments of the present invention have been described, it should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is shown by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

Claims

1. A cooling device is applied to a hybrid vehicle that travels with at least one of an internal combustion engine equipped with a supercharger and a driving electric motor whose supply electrodes are regulated by an inverter as a power source for vehicle driving. Among them, the cooling device includes: a first refrigerant circuit in which a first refrigerant for cooling the internal combustion engine circulates; and a second refrigerant circuit that is independently provided with respect to the first refrigerant circuit, and a second refrigerant circulates in this second refrigerant circuit. The second refrigerant circuit is arranged in a way that connects a radiator, a pump, the inverter, an oil cooler, an intercooler, and a turbocharger. The radiator can cool the second refrigerant through heat exchange with external gas. The pump is used to make the second refrigerant circulate in the second refrigerant circuit. The intercooler conducts heat exchange between the intake air pressurized by the supercharger and the refrigerant. The oil cooler is arranged to be able to cool the driving electric motor. The turbocharger is included in the supercharger. The inverter, the oil cooler, the intercooler, and the turbocharger are arranged on the downstream side of the pump in the flow direction of the second refrigerant. The radiator is arranged on the upstream side of the pump in the flow direction. The second refrigerant circuit includes a connection flow path connecting the radiator and the pump, a first flow path and a second flow path that branch out in parallel on the downstream side of the pump, a confluence flow path where the first flow path and the second flow path converge, and a first branch path and a second branch path that branch out from the confluence flow path. The inverter, the oil cooler, and the intercooler are serially arranged in the first flow path. The turbocharger is arranged in the second flow path. The first branch path connects the confluence flow path and the radiator. The second branch path connects the confluence flow path and the connection flow path in a way that allows the second refrigerant to bypass the radiator. A flow rate regulating device is provided at the branch portion where the confluence flow path branches into the first branch path and the second branch path. This flow rate regulating device regulates the flow rate of the second refrigerant flowing from the confluence flow path to the first branch path and the flow rate of the second refrigerant flowing from the confluence flow path to the second branch path. The oil cooler is arranged to be able to heat up the automatic transmission fluid, and the automatic transmission fluid circulates in the circulation path of the transmission mounted on the internal combustion engine.

2. The cooling device according to claim 1, wherein the flow rate regulating device switches between a first state where the second refrigerant flows from the confluence flow path to the first branch path and a second state where the second refrigerant flows from the confluence flow path to the second branch path.

3. The cooling device according to claim 2, wherein the cooling device includes a control unit that controls the operation of the flow rate regulating device. The control unit includes a temperature estimation unit that estimates the temperature of the second refrigerant flowing toward the first flow path and the second flow path. The control unit controls the operation of the flow rate adjusting device such that when the temperature of the second refrigerant estimated by the temperature estimating unit is equal to or higher than a set threshold value, it becomes the first state, and when the temperature of the second refrigerant estimated by the temperature estimating unit is less than the set threshold value, it becomes the second state.

4. The cooling device according to claim 2, wherein the flow rate adjusting device is a thermostat, and when the temperature of the second refrigerant flowing in the converging flow path is equal to or higher than a specified threshold value, it becomes the first state, and when the temperature of the second refrigerant flowing in the converging flow path is less than the specified threshold value, it becomes the second state.

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