Temperature control system for vehicle and vehicle

Abstract

To provide a temperature control system for a vehicle which can improve fuel efficiency of the vehicle if cooling of a rotating electric machine is unnecessary while cooling the rotating electric machine if the cooling of the rotating electric machine is necessary.SOLUTION: A temperature control system 10 for a vehicle comprises a first temperature control circuit 61 in which a first temperature control medium TCM1 circulates to perform temperature control of an electric motor 20 and a speed change gear 40; a second temperature control circuit 62 in which a second temperature control medium TCM2 circulates; a heat exchanger 63 that performs heat exchange between the first temperature control medium TCM1 and the second temperature control medium TCM2; a valve device 626 that adjusts the flow of the second temperature control medium TCM2 flowing through the heat exchanger 63; and a control device ECU including a valve opening / closing control part 73 that controls opening and closing of the valve device 626. The valve opening / closing control part 73 controls the valve device 626 to close when the temperature of the first temperature control medium TCM1 is below a prescribed temperature Tset1, and controls the valve device 626 to open when the temperature of the first temperature control medium TCM1 is Tset1 or higher.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a vehicle temperature control system mounted on an electric vehicle or the like, and to the vehicle. [Background technology]

[0002] In recent years, efforts to realize a low-carbon or carbon-free society have become more active, and research and development is being conducted on vehicle electrification technologies to reduce CO2 emissions and improve energy efficiency in vehicles.

[0003] Generally, an electric vehicle includes a rotating electric machine and a power conversion device that controls the power supplied to the rotating electric machine. Since the rotating electric machine and the power conversion device generate heat when the electric vehicle is driven, many electric vehicles are equipped with a vehicle temperature control system that controls the temperature of the rotating electric machine and the power conversion device.

[0004] In vehicle electrification technology, it is required to more efficiently cool the rotating electric machine and the power conversion device, while at the same time further improving the fuel efficiency of the vehicle. One method for improving the fuel efficiency of a vehicle is to suppress an increase in friction loss in the rotating electric machine and the gear box. For example, Patent Document 1 describes a vehicle temperature control system that controls a flow control valve based on the temperature of a first temperature control medium that controls the temperature of the rotating electric machine and the gear box, and the temperature of a second temperature control medium that controls the temperature of the power conversion device, thereby suppressing an increase in friction loss in the rotating electric machine and the gear box. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7314222 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the vehicle temperature control system of Patent Document 1, even when the temperature of the first temperature control medium is equal to or lower than a predetermined temperature, the valve device may open, so there is room for further improvement in order to suppress an increase in friction loss in the gear box. In particular, when the temperature of the first temperature control medium is equal to or lower than a predetermined temperature, cooling of the rotating electric machine is not necessary, so it is preferable to increase the temperature of the first temperature control medium as early as possible to reduce the viscosity of the first temperature control medium.

[0007] The present invention provides a vehicle temperature regulation system and a vehicle that can cool a rotating electric machine when cooling is required, while improving the fuel efficiency of the vehicle when cooling of the rotating electric machine is not required. [Means for solving the problem]

[0008] The first aspect of the present invention is A vehicle temperature control system that is mounted on a vehicle including a rotating electric machine, a transmission, and a power conversion device that controls power supplied to the rotating electric machine, The vehicle temperature control system includes: a first temperature control circuit including a first pump and through which a first temperature control medium circulates to control the temperature of the rotating electric machine and the transmission; a second temperature control circuit including a second pump and through which a second temperature control medium circulates to control the temperature of the power conversion device; a heat exchanger that exchanges heat between the first temperature control medium and the second temperature control medium; a flow rate regulating valve that regulates the flow rate of the second temperature control medium flowing through the heat exchanger; A control device for controlling the flow rate regulating valve. The second temperature control circuit is a pressure-feeding flow path provided with the second pump, the pressure-feeding flow path having a branching portion at one end and a junction portion at the other end; a first branch flow path having the power converter, one end of the first branch flow path being connected to the branching portion and the other end of the first branch flow path being connected to the junction portion; a second branch flow path provided with the heat exchanger and the flow rate control valve, one end of the second branch flow path connected to the branch portion and the other end of the second branch flow path connected to the junction portion, the second branch flow path being formed in parallel with the first branch flow path, a radiator that performs heat exchange between the second temperature control medium and outside air is provided in the pressure-feeding passage, The control device includes: A first temperature control medium temperature detection unit that detects the temperature of the first temperature control medium; a valve opening / closing control unit that controls the opening and closing of the flow rate regulating valve, The valve opening / closing control unit is When the temperature of the first temperature control medium detected by the first temperature control medium temperature detection unit is lower than a predetermined temperature, the flow rate adjustment valve is controlled to be closed; When the temperature of the first temperature control medium detected by the first temperature control medium temperature detection unit becomes equal to or higher than the predetermined temperature while the flow rate control valve is closed, the flow rate control valve is controlled to open. A vehicle temperature control system.

[0009] A second aspect of the present invention is A vehicle including a rotating electric machine, a transmission, a power conversion device that controls power supplied to the rotating electric machine, and a vehicle temperature control system, The vehicle temperature control system includes: a first temperature control circuit including a first pump and through which a first temperature control medium circulates to control the temperature of the rotating electric machine and the transmission; a second temperature control circuit including a second pump and through which a second temperature control medium circulates to control the temperature of the power conversion device; a heat exchanger that exchanges heat between the first temperature control medium and the second temperature control medium; a flow rate regulating valve that regulates the flow rate of the second temperature control medium flowing through the heat exchanger; A control device for controlling the flow rate regulating valve. The second temperature control circuit is a pressure-feeding flow path provided with the second pump, the pressure-feeding flow path having a branching portion at one end and a junction portion at the other end; a first branch flow path having the power converter, one end of the first branch flow path being connected to the branching portion and the other end of the first branch flow path being connected to the junction portion; a second branch flow path provided with the heat exchanger and the flow rate control valve, one end of the second branch flow path connected to the branch portion and the other end of the second branch flow path connected to the junction portion, the second branch flow path being formed in parallel with the first branch flow path, a radiator that performs heat exchange between the second temperature control medium and outside air is provided in the pressure-feeding passage, The control device includes: A first temperature control medium temperature detection unit that detects the temperature of the first temperature control medium; a valve opening / closing control unit that controls the opening and closing of the flow rate regulating valve, The valve opening / closing control unit is When the temperature of the first temperature control medium detected by the first temperature control medium temperature detection unit is lower than a predetermined temperature, the flow rate adjustment valve is controlled to be closed; When the temperature of the first temperature control medium detected by the first temperature control medium temperature detection unit becomes equal to or higher than the predetermined temperature while the flow rate control valve is closed, the flow rate control valve is controlled to open. It is a vehicle. Effect of the Invention

[0010] According to the present invention, when cooling of the rotating electric machine is required, the rotating electric machine is cooled by the first temperature control medium, and when cooling of the rotating electric machine is not required, the temperature of the first temperature control medium is raised, thereby improving the fuel efficiency of the vehicle. [Brief description of the drawings]

[0011] [Figure 1] 1 is a block diagram of a vehicle temperature control system according to an embodiment of the present invention; [Diagram 2] 2 is a diagram showing a configuration of a valve device in the vehicle temperature control system of FIG. 1. [Diagram 3] 2 is a block diagram of a control device in the vehicle temperature adjustment system of FIG. 1. [Figure 4] 4 is a flowchart showing a control flow of the valve device in a valve opening / closing control unit in the control device of FIG. 3. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of a vehicle equipped with a vehicle temperature control system of the present invention will be described with reference to the accompanying drawings. Note that the drawings are to be read in the direction indicated by the reference numerals.

[0013] (Overall configuration of vehicle temperature control system) 1, a vehicle temperature adjustment system 10 of this embodiment is mounted on a vehicle V which is equipped with an internal combustion engine ICE, a control device ECU, an electric motor 20, a generator 30, a transmission 40, and a power conversion device 50. The vehicle temperature adjustment system 10 includes the internal combustion engine ICE, the control device ECU, the electric motor 20, the generator 30, the transmission 40, the power conversion device 50, and a temperature adjustment circuit 60.

[0014] The electric motor 20 is a rotating electric machine that outputs power to drive the vehicle V using electric power stored in a power storage device (not shown) mounted on the vehicle V or electric power generated by a generator 30. When braking the vehicle V, the electric motor 20 may generate electric power using kinetic energy of the drive wheels of the vehicle V to charge the aforementioned power storage device.

[0015] The generator 30 is a rotating electric machine that generates electricity using the power of the internal combustion engine ICE. The generator 30 charges the above-mentioned power storage device or supplies electric power to the electric motor 20.

[0016] The transmission 40 is a device that reduces the speed of the power output from the electric motor 20 and transmits it to the drive wheels. The transmission 40 is, for example, a gear-type power transmission device.

[0017] The power conversion device 50 includes a PDU (Power Drive Unit) (not shown) that converts the power output from the above-mentioned power storage device from DC to AC to control the input / output power of the electric motor 20 and the generator 30, and a VCU (Voltage Control Unit) (not shown) that boosts the power output from the above-mentioned power storage device as necessary. When the electric motor 20 generates power during braking of the vehicle V, the VCU may step down the power generated by the electric motor 20.

[0018] The temperature control circuit 60 includes a first temperature control circuit 61 through which a non-conductive first temperature control medium TCM1 circulates and controls the temperatures of the electric motor 20, the generator 30, and the transmission 40, a second temperature control circuit 62 through which a conductive second temperature control medium TCM2 circulates and controls the temperature of the power conversion device 50, and a heat exchanger 63 that exchanges heat between the first temperature control medium TCM1 and the second temperature control medium TCM2. The non-conductive first temperature control medium TCM1 is, for example, an oil called ATF (Automatic Transmission Fluid) that can lubricate and control the temperature of the electric motor 20, the generator 30, and the transmission 40. The conductive second temperature control medium TCM2 is, for example, a cooling water called LLC (Long Life Coolant).

[0019] (Configuration of the first temperature control circuit) The first temperature control circuit 61 is provided with a first pump 611 and a storage section 612. The first pump 611 is a mechanical pump that is driven by the power of the internal combustion engine ICE and the rotational force of an axle (not shown) of the vehicle V. The storage section 612 stores the first temperature control medium TCM1 that circulates through the first temperature control circuit 61. The storage section 612 is, for example, an oil pan provided at the bottom of a housing (not shown) that accommodates the electric motor 20, the generator 30, and the transmission 40.

[0020] The first temperature control circuit 61 is provided with a first pump 611 and has a pressure flow passage 610a whose upstream end is connected to a storage section 612. A branch section 613 is provided at the downstream end of the pressure flow passage 610a. The first temperature control circuit 61 is provided with a heat exchanger 63, an electric motor 20, and a generator 30, and has a first branch flow passage 610b1 whose upstream end is connected to the branch section 613 and whose downstream end is connected to the storage section 612. In the first branch flow passage 610b1, the heat exchanger 63 is disposed upstream of the electric motor 20 and the generator 30, and the electric motor 20 and the generator 30 are disposed in parallel. The first temperature control circuit 61 is provided with a transmission 40 and has a second branch flow passage 610b2 whose upstream end is connected to the branch section 613 and whose downstream end is connected to the storage section 612.

[0021] Therefore, in the first temperature control circuit 61, the first temperature control medium TCM1 pumped by the first pump 611 in the pressure-feeding passage 610a passes through the branching portion 613, passes through the first branching passage 610b1, and is cooled by heat exchange with the second temperature control medium TCM2 in the heat exchanger 63, is supplied to the electric motor 20 and the generator 30 to lubricate and regulate the temperature of the electric motor 20 and the generator 30, and is then stored in the storage portion 612; The first temperature control medium TCM1 pumped by the first pump 611 passes through the branch section 613 and the second branch flow path 610b2 and is supplied to the transmission 40 to lubricate and regulate the temperature of the transmission 40, and then is stored in the storage section 612. A flow path is formed in parallel with this, and the first temperature control medium TCM1 stored in the storage section 612 flows through the pumping flow path 610a and is supplied to the first pump 611, and the first temperature control medium TCM1 circulates through the first temperature control circuit 61.

[0022] In this embodiment, the first branch flow path 610b1 and the second branch flow path 610b2 are formed so that the flow rate of the first temperature control medium TCM1 flowing through the first branch flow path 610b1 is greater than the flow rate of the first temperature control medium TCM1 flowing through the second branch flow path 610b2.

[0023] The first temperature control circuit 61 is provided with a first temperature sensor 61a that detects the temperature of the first temperature control medium TCM1 circulating through the first temperature control circuit 61. In this embodiment, the first temperature sensor 61a is provided in a storage unit 612 that is an oil pan, and detects the temperature of the first temperature control medium TCM1 stored in the storage unit 612. The first temperature sensor 61a outputs a detection value of the temperature of the first temperature control medium TCM1 stored in the storage unit 612 to the control device ECU.

[0024] The first temperature control circuit 61 further includes a pressure control circuit 610c whose upstream end is connected to the reservoir 612 and whose downstream end is connected to the pumping flow path 610a downstream of the first pump 611. The pressure control circuit 610c is provided with a pressure control valve 619. The pressure control valve 619 may be a check valve or an electromagnetic valve such as a solenoid valve. When the liquid pressure of the first temperature control medium TCM1 pumped from the first pump 611 reaches a predetermined upper limit pressure or higher, the pressure control valve 619 opens, and a part of the first temperature control medium TCM1 pumped from the first pump 611 is returned to the reservoir 612. As a result, the liquid pressure of the first temperature control medium TCM1 flowing through the first branch flow path 610b1 and the second branch flow path 610b2 is maintained below the upper limit pressure.

[0025] In the first temperature control circuit 61, the temperature of the first temperature control medium TCM1 stored in the storage section 612 after cooling the electric motor 20, the generator 30, and the transmission 40 is approximately 100° C. Therefore, the first temperature control medium TCM1 at approximately 100° C. is supplied to the heat exchanger 63.

[0026] (Configuration of the second temperature control circuit) The second temperature control circuit 62 includes a second pump 621, a radiator 622, a storage tank 623, and a power conversion device 50. The second pump 621 is, for example, an electric pump driven by the power stored in the above-mentioned power storage device. The second pump 621 is provided with a rotation speed sensor 621a for detecting the rotation speed of the second pump 621. The rotation speed sensor 621a outputs the detection value of the rotation speed of the second pump 621 to the control device ECU. The radiator 622 is disposed at the front of the vehicle V, and is a heat dissipation device that exchanges heat between the second temperature control medium TCM2 and the outside air by the running wind when the vehicle V is running, thereby cooling the second temperature control medium TCM2. The storage tank 623 is a tank for temporarily storing the second temperature control medium TCM2 circulating in the second temperature control circuit 62. Even if cavitation occurs in the second temperature control medium TCM2 circulating through the second temperature control circuit 62, the second temperature control medium TCM2 circulating through the second temperature control circuit 62 is temporarily stored in the storage tank 623, and the cavitation that occurred in the second temperature control medium TCM2 disappears.

[0027] The second temperature control circuit 62 has a pumping flow path 620a in which a storage tank 623, a second pump 621, and a radiator 622 are provided in this order from the upstream side. A junction 625 is provided at the upstream end of the pumping flow path 620a, and a branching part 624 is provided at the downstream end of the pumping flow path 620a. Therefore, the second temperature control medium TCM2 that flows into the pumping flow path 620a from the junction 625 is temporarily stored in the storage tank 623, then pumped by the second pump 621 and supplied to the radiator 622, where it is cooled by heat exchange with the outside air, and flows to the branching part 624.

[0028] The second temperature control circuit 62 further includes a first branch flow passage 620b1 in which the power converter 50 is provided, an upstream end of which is connected to the branch section 624, a downstream end of which passes through the power converter 50 and is connected to the junction section 625, and a second branch flow passage 620b2 in which a heat exchanger 63 is provided, an upstream end of which is connected to the branch section 624, a downstream end of which passes through the heat exchanger 63 and is connected to the junction section 625. In this embodiment, a valve device 626 is provided in a portion upstream of the heat exchanger 63 of the second branch flow passage 620b2. In this embodiment, the valve device 626 is a solenoid valve that switches the second branch flow passage 620b2 between a fully open state and a fully closed state. The valve device 626 is controlled by the control device ECU. A detailed configuration of the valve device 626 will be described later.

[0029] Therefore, the second temperature control medium TCM2 pumped by the second pump 621 in the pumping passage 620a and cooled by the radiator 622 branches into a first branch passage 620b1 and a second branch passage 620b2 at the branching portion 624. The second temperature control medium TCM2 flowing through the first branch passage 620b1 cools the power converter 50 and merges with the second branch passage 620b2 and the pumping passage 620a at the merging portion 625. The second temperature control medium TCM2 flowing through the second branch passage 620b2 cools the first temperature control medium TCM1 by exchanging heat with the first temperature control medium TCM1 in the heat exchanger 63 and merges with the first branch passage 620b1 and the pumping passage 620a at the merging portion 625. The second temperature control medium TCM2 that has flowed through the first branch flow path 620b1 and the second temperature control medium TCM2 that has flowed through the second branch flow path 620b2 join at the junction 625, flow through the pumping flow path 620a, and are temporarily stored in the storage tank 623. The second temperature control medium TCM2 stored in the storage tank 623 is then supplied again to the second pump 621 through the pumping flow path 620a, and the second temperature control medium TCM2 circulates through the second temperature control circuit 62.

[0030] In this embodiment, the first branch flow path 620b1 and the second branch flow path 620b2 are formed so that the flow rate of the second temperature control medium TCM2 flowing through the first branch flow path 620b1 is greater than the flow rate of the second temperature control medium TCM2 flowing through the second branch flow path 620b2.

[0031] The second temperature control circuit 62 is provided with a second temperature sensor 62a that detects the temperature of the second temperature control medium TCM2 circulating through the second temperature control circuit 62. In this embodiment, the second temperature sensor 62a is provided between the radiator 622 and the branching portion 624 in the pressure-feeding flow path 620a, and detects the temperature of the second temperature control medium TCM2 discharged from the radiator 622. The second temperature sensor 62a outputs a detection value of the temperature of the second temperature control medium TCM2 discharged from the radiator 622 to the control device ECU.

[0032] In the second temperature control circuit 62, the temperature of the second temperature control medium TCM2 cooled by the radiator 622 is about 40° C. The second temperature control medium TCM2 supplied to the heat exchanger 63 does not pass through the power conversion device 50, which is the temperature-controlled device, and therefore the second temperature control medium TCM2 at about 40° C. is supplied to the heat exchanger 63.

[0033] (Heat exchanger configuration) The heat exchanger 63 exchanges heat between the first temperature control medium TCM1 of about 100° C. and the second temperature control medium TCM2 of about 40° C., both of which are supplied to the heat exchanger 63. Then, from the heat exchanger 63, the first temperature control medium TCM1 of about 80° C. is discharged downstream of the first branch flow path 610b1 of the first temperature control circuit 61, and the second temperature control medium TCM2 of about 70° C. is discharged downstream of the second branch flow path 620b2 of the second temperature control circuit 62.

[0034] In this way, the first temperature control medium TCM1 is cooled by the heat exchanger 63, so the temperature control circuit 60 can cool the first temperature control medium TCM1 without providing a radiator for cooling the first temperature control medium TCM1. Therefore, the temperature control circuit 60 can cool the first temperature control medium TCM1 flowing through the first temperature control circuit 61 and the second temperature control medium TCM2 flowing through the second temperature control circuit 62 with one radiator 622, so the temperature control circuit 60 can be made compact.

[0035] (Valve device configuration) Next, the configuration of the valve device 626 will be described with reference to FIG.

[0036] As shown in FIG. 2, the valve device 626 includes an inlet portion 626a through which the second temperature control medium TCM2 flows, an outlet portion 626b through which the second temperature control medium TCM2 flows, an intra-valve flow path 626c extending from the inlet portion 626a to the outlet portion 626b, a valve body member 626d provided in the intra-valve flow path 626c for opening and closing the intra-valve flow path 626c, a biasing member 626e for biasing the valve body member 626d, and a solenoid portion (not shown) capable of generating electromagnetic force.

[0037] In this embodiment, the intra-valve flow path 626c extends in a substantially straight line, and the valve body member 626d is provided near the inlet portion 626a. The valve body member 626d is provided so as to slide along the inner wall surface 626c1 of the intra-valve flow path 626c. The valve body member 626d has a shape capable of closing the inlet portion 626a. In this embodiment, the valve body member 626d has a disk shape. The valve body member 626d is attracted by an electromagnetic force generated by a solenoid unit (not shown). The biasing member 626e is an elastic member such as a coil spring. One end of the biasing member 626e is connected to the end of the intra-valve flow path 626c on the inlet portion 626a side, and the other end of the biasing member 626e is connected to the valve body member 626d. The biasing member 626e biases the valve body member 626d in a direction away from the inlet portion 626a.

[0038] A locking portion 626f is formed in the in-valve flow path 626c, closer to the outlet portion 626b than the valve body member 626d. The locking portion 626f is, for example, a protrusion that protrudes toward the center of the in-valve flow path 626c. The locking portion 626f is capable of locking the valve body member 626d that slides along the inner wall surface 626c1 of the in-valve flow path 626c.

[0039] 2(a), when a solenoid unit (not shown) is in an off state and does not generate electromagnetic force, the valve device 626 is in a fully open state. At this time, the valve body member 626d is biased in a direction away from the inlet portion 626a by the biasing force of the biasing member 626e, and is in a state of being locked by the locking portion 626f.

[0040] 2B, when a solenoid unit (not shown) is in an on state and generates an electromagnetic force, the valve device 626 is in a fully closed state. At this time, the valve body member 626d is attracted toward the inlet portion 626a by the electromagnetic force generated by the solenoid unit (not shown), and moves toward the inlet portion 626a against the biasing force of the biasing member 626e, thereby closing the inlet portion 626a.

[0041] Then, when the solenoid unit (not shown) is turned off again to transition the valve device 626 to the fully open state, the valve element 626d is operated in a direction away from the inlet 626a by the resultant force of the fluid pressure of the second temperature control medium TCM2 at the inlet 626a and the biasing force of the biasing member 626e. At this time, if the fluid pressure of the second temperature control medium TCM2 from the outlet 626b toward the valve element 626d is not greater than the resultant force of the fluid pressure of the second temperature control medium TCM2 at the inlet 626a and the biasing force of the biasing member 626e, the valve device 626 can be transitioned to the fully open state. When the valve device 626 is in a fully closed state, the pressure on the upstream side of the valve device 626, i.e., the inlet portion 626a side, is high and the pressure on the downstream side of the valve device 626, i.e., the outlet portion 626b side, is low, so that the fluid pressure of the second temperature regulating medium TCM2 flowing from the outlet portion 626b side toward the valve body member 626d is unlikely to become greater than the combined force of the fluid pressure of the second temperature regulating medium TCM2 at the inlet portion 626a and the biasing force of the biasing member 626e.

[0042] In this way, the valve device 626 is formed such that, when fully closed, the valve body member 626d moves toward the inlet portion 626a to close the inlet portion 626a, thereby preventing the valve device 626 from becoming stuck in the fully closed state. Furthermore, since the biasing force of the biasing member 626e required when the valve device 626 transitions from the fully closed state to the fully open state can be reduced, the cost of the biasing member 626e can be reduced, and the cost of the valve device 626 can be reduced.

[0043] (Control device configuration) The control device ECU controls the internal combustion engine ICE, the power conversion device 50, the second pump 621, and the valve device 626. The control device ECU may detect a failure of the heat exchanger 63 based on a detection value of the rotation speed of the second pump 621 output from the rotation speed sensor 621a. For example, the control device ECU may detect a failure of the heat exchanger 63 by determining that the heat exchanger 63 has failed when a fluctuation range of the detection value of the rotation speed of the second pump 621 output from the rotation speed sensor 621a with respect to a target rotation speed is equal to or greater than a predetermined value.

[0044] As shown in FIG. 3, the control device ECU includes a first temperature control medium temperature detection unit 71 that detects the temperature of the first temperature control medium TCM1 based on a signal from the first temperature sensor 61a, a second temperature control medium temperature detection unit 72 that detects the temperature of the second temperature control medium TCM2 based on a signal from the second temperature sensor 62a, a valve opening / closing control unit 73 that controls the opening and closing of the valve device 626, a vehicle speed detection unit 74 that detects the speed of the vehicle V, a gradient angle detection unit 75 that detects the gradient angle of the road surface on which the vehicle V is traveling, an uphill driving determination unit 76 that determines whether the vehicle V is traveling uphill based on the detection values ​​of the vehicle speed detection unit 74 and the gradient angle detection unit 75, a slip determination unit 77 that determines whether at least one wheel of the vehicle V is spinning, and a drive torque detection unit 78 that detects the drive torque of the vehicle V.

[0045] (Control flow of the valve device in the valve opening / closing control unit in the control device) Next, a control flow of the valve device 626 in the valve opening / closing control section 73 in the control device ECU will be described with reference to FIG.

[0046] The control flow of the valve device 626 in the valve opening / closing control unit 73 starts when the vehicle V switches from a power-off state to a power-on state. The power-on state of the vehicle V refers to a state in which the power supply system of the vehicle V is turned on, at least one of the internal combustion engine ICE and the electric motor 20, which are the drive sources of the vehicle V, is running, and the power required to drive the vehicle V is supplied to the auxiliary equipment required for the vehicle V to run, and refers to a state in which the vehicle V is running or a state in which the vehicle V can run immediately. The power supply system is turned on, for example, when a power switch (not shown) provided on the vehicle V is turned on by the operator of the vehicle V. The power supply system may also be turned on when an ignition switch for starting the internal combustion engine ICE is turned on by the operator of the vehicle V.

[0047] First, when the vehicle V switches from a power-off state to a power-on state, the valve opening / closing control unit 73 controls the valve device 626 to close (step S101). Then, the process proceeds to step S102.

[0048] In step S102, the valve opening / closing control unit 73 determines whether the temperature of the first temperature control medium TCM1 detected by the first temperature control medium temperature detection unit 71 is less than a predetermined temperature Tset1 [°C]. The predetermined temperature Tset1 is, for example, 80 [°C].

[0049] If the temperature of the first temperature control medium TCM1 detected by the first temperature control medium temperature detection unit 71 is lower than the predetermined temperature Tset1 [° C.] in step S102 (step S102: YES), the valve opening / closing control unit 73 proceeds to step S202.

[0050] In step S102, if the temperature of the first temperature control medium TCM1 detected by the first temperature control medium temperature detection unit 71 is not below the predetermined temperature Tset1 [°C], that is, if the temperature of the first temperature control medium TCM1 detected by the first temperature control medium temperature detection unit 71 is equal to or higher than the predetermined temperature Tset1 [°C] (step S102: NO), the valve opening / closing control unit 73 proceeds to step S103.

[0051] In step S103, the valve opening / closing control unit 73 determines whether or not the uphill traveling determination unit 76 has determined that the vehicle V is traveling uphill.

[0052] The uphill travel determination unit 76 stores, for example, a table in which threshold gradient angles are set corresponding to each vehicle speed of the vehicle V. As an example, the threshold gradient angle is 10[°] when the vehicle speed of the vehicle V is 10[km / h], the threshold gradient angle is 6[°] when the vehicle speed of the vehicle V is 80[km / h], the threshold gradient angle is 4[°] when the vehicle speed of the vehicle V is 120[km / h], etc.

[0053] The uphill travel determination unit 76 determines whether the vehicle V is traveling uphill based on the vehicle speed of the vehicle V detected by the vehicle speed detection unit 74 and the gradient angle of the road surface on which the vehicle V is traveling detected by the gradient angle detection unit 75. As an example, by referring to the above-mentioned table in which threshold gradient angles are set corresponding to each vehicle speed of the vehicle V, if the gradient angle of the road surface on which the vehicle V is traveling detected by the gradient angle detection unit 75 is equal to or greater than the threshold gradient angle corresponding to the vehicle speed of the vehicle V detected by the vehicle speed detection unit 74, it determines that the vehicle V is traveling uphill, and if the gradient angle is less than the threshold gradient angle corresponding to the vehicle speed of the vehicle V detected by the vehicle speed detection unit 74, it determines that the vehicle V is not traveling uphill.

[0054] If, in step S103, the uphill driving determination unit 76 determines that the vehicle V is driving uphill (step S103: YES), the valve opening / closing control unit 73 proceeds to step S201, controls the valve device 626 to open, and then proceeds to step S202.

[0055] If the uphill traveling determination unit 76 determines in step S103 that the vehicle V is not traveling uphill (step S103: NO), the valve opening / closing control unit 73 proceeds to step S104.

[0056] In step S104, the valve opening / closing control unit 73 determines whether or not the slip determination unit 77 has determined that at least one wheel of the vehicle V is spinning.

[0057] For example, vehicle V has front, rear, left and right wheels, each of which is provided with a wheel speed sensor that detects the rotational speed of the wheel, and based on the detection signals output from the wheel speed sensors provided on each wheel, slip determination unit 77 determines that either the left or right front wheel is spinning if the wheel speed difference between the left and right front wheels is equal to or greater than a predetermined value, and determines that either the left or right rear wheel is spinning if the wheel speed difference between the left and right rear wheels is equal to or greater than a predetermined value.

[0058] If the slip determination unit 77 determines in step S104 that at least one wheel of the vehicle V is spinning (step S104: YES), the valve opening / closing control unit 73 proceeds to step S201, controls the valve device 626 to open, and proceeds to step S202.

[0059] If the slip determination unit 77 determines in step S104 that the wheels of the vehicle V are not spinning (step S104: NO), the valve opening / closing control unit 73 proceeds to step S105.

[0060] In step S105, the valve opening / closing control unit 73 determines whether the driving torque of the vehicle V detected by the driving torque detection unit 78 is equal to or greater than a predetermined value Nset1 [N·m]. The predetermined value Nset1 [N·m] is, for example, a value equal to or greater than the maximum torque required when the vehicle V runs on its own without towing a towed vehicle such as a trailer or another vehicle such as a broken-down vehicle, and is the value of the driving torque required when running while towing a towed vehicle or another vehicle. The predetermined value Nset1 [N·m] is, for example, 4000 [N·m].

[0061] For example, the vehicle V is provided with a torque sensor that detects the torsion angle of the drive shaft of the vehicle V, and the drive torque detection unit 78 detects the drive torque of the vehicle V based on a detection signal corresponding to the torsion angle of the drive shaft output from this torque sensor.

[0062] If, in step S105, the driving torque of the vehicle V detected by the driving torque detection unit 78 is equal to or greater than the predetermined value Nset1 [N·m] (step S105: YES), the valve opening / closing control unit 73 proceeds to step S201, controls the valve device 626 to open, and then proceeds to step S202.

[0063] If, in step S105, the driving torque of the vehicle V detected by the driving torque detection unit 78 is not greater than or equal to the predetermined value Nset1 [N·m], that is, if the driving torque of the vehicle V detected by the driving torque detection unit 78 is less than the predetermined value Nset1 [N·m] (step S105: NO), the valve opening / closing control unit 73 continues to control the valve device 626 to close and proceeds to step S202.

[0064] In step S202, the valve opening / closing control unit 73 determines whether or not the vehicle V has switched from a power-on state to a power-off state.

[0065] If the vehicle V has switched from a power-on state to a power-off state in step S202 (step S202: YES), the valve opening / closing control unit 73 ends the series of controls.

[0066] If, in step S202, the vehicle V remains in the power-on state and has not been switched to the power-off state (step S202: NO), the valve opening / closing control unit 73 returns to step S102.

[0067] In this way, the valve opening / closing control unit 73 controls the valve device 626 to close regardless of the temperature of the second temperature control medium TCM2 when the temperature of the first temperature control medium TCM1 detected by the first temperature control medium temperature detection unit 71 is below the predetermined temperature Tset1 [°C], and controls the valve device 626 to open when the temperature of the first temperature control medium TCM1 detected by the first temperature control medium temperature detection unit 71 becomes equal to or higher than the predetermined temperature Tset1 [°C] while the valve device 626 is closed.

[0068] Generally, the higher the temperature of the first temperature control medium TCM1, the lower the viscosity. Therefore, in the first temperature control circuit 61, when the first temperature control medium TCM1 is used to lubricate and control the temperature of the electric motor 20, the generator 30, and the transmission 40, the higher the temperature of the first temperature control medium TCM1, the smaller the friction loss.

[0069] In this embodiment, when the temperature of the first temperature control medium TCM1 is lower than the predetermined temperature Tset1 [°C], the electric motor 20 and the generator 30 are not at high temperature and do not require cooling. On the other hand, the valve device 626 is closed, so that the second temperature control medium TCM2 cooled by the radiator 622 is not supplied to the heat exchanger 63. Therefore, the first temperature control medium TCM1 is not cooled by the heat exchanger 63, and the temperature of the first temperature control medium TCM1 increases due to the heat generated by the electric motor 20 and the generator 30, and the viscosity of the first temperature control medium TCM1 decreases, so that friction loss can be reduced and the fuel efficiency of the vehicle V is improved. Then, when the temperature of the first temperature control medium TCM1 reaches or exceeds a predetermined temperature Tset1 [°C], the valve device 626 opens and the second temperature control medium TCM2 cooled by the radiator 622 is supplied to the heat exchanger 63, where the first temperature control medium TCM1 is cooled by heat exchange with the second temperature control medium TCM2, and the electric motor 20 and the generator 30 are cooled by the first temperature control medium TCM1.

[0070] As a result, when cooling of the electric motor 20 and the generator 30 is not required, the valve device 626 can be closed to reduce the viscosity of the first temperature control medium TCM1, thereby reducing friction loss and improving the fuel efficiency of the vehicle V. On the other hand, when cooling of the electric motor 20 and the generator 30 is required, the valve device 626 can be opened to cool the first temperature control medium TCM1 and thereby cool the electric motor 20 and the generator 30.

[0071] In this way, when cooling of the electric motor 20 and the generator 30 is required, the electric motor 20 and the generator 30 are cooled by the first temperature control medium TCM1, and when cooling of the electric motor 20 and the generator 30 is not required, the temperature of the first temperature control medium TCM1 is raised, thereby improving the fuel efficiency of the vehicle V.

[0072] Furthermore, when the climbing driving determination unit 76 determines that the vehicle V is driving uphill, even if the temperature of the first temperature control medium TCM1 detected by the first temperature control medium temperature detection unit 71 is below the predetermined temperature Tset1 [°C], the valve opening / closing control unit 73 controls the valve device 626 to open. Therefore, when the vehicle V is driving in a manner that makes the electric motor 20 and the generator 30 more likely to generate heat than during normal driving, the electric motor 20 and the generator 30 can be quickly cooled.

[0073] Furthermore, when the slip determination unit 77 determines that at least one wheel of the vehicle V is spinning, even if the temperature of the first temperature control medium TCM1 detected by the first temperature control medium temperature detection unit 71 is below the predetermined temperature Tset1 [°C], the valve opening / closing control unit 73 controls the valve device 626 to open. Therefore, when the vehicle V is traveling in a manner that makes the electric motor 20 and the generator 30 more likely to generate heat than during normal traveling, the electric motor 20 and the generator 30 can be quickly cooled.

[0074] Furthermore, the valve opening / closing control unit 73 controls the valve device 626 to open when the temperature of the first temperature control medium TCM1 detected by the first temperature control medium temperature detection unit 71 is below the predetermined temperature Tset1 [°C] but the driving torque detected by the driving torque detection unit 78 is equal to or greater than the predetermined value Nset1 [N·m]. This allows the electric motor 20 and the generator 30 to be cooled quickly when the vehicle V is performing towing or other driving that makes the electric motor 20 and the generator 30 more likely to generate heat than during normal driving.

[0075] In addition, in this embodiment, in the control flow of the valve device 626 in the valve opening / closing control unit 73, when the temperature of the first temperature control medium TCM1 detected by the first temperature control medium temperature detection unit 71 is less than a predetermined temperature Tset1 [°C], the uphill driving determination unit 76 determines whether or not the vehicle V is driving uphill, the slip determination unit 77 determines whether or not at least one wheel of the vehicle V is spinning, and the driving torque detection unit 78 determines whether or not the driving torque is equal to or greater than a predetermined value Nset1 [N·m].

[0076] As a result, the driving state of the vehicle V is determined in order of the driving state in which the electric motor 20 and the generator 30 are most likely to generate heat, so that when the driving state of the vehicle V is a driving state in which the electric motor 20 and the generator 30 are most likely to generate heat, the electric motor 20 and the generator 30 can be cooled more quickly.

[0077] Although one embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such an embodiment. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present invention. In addition, the components in the above embodiment may be arbitrarily combined within the scope of the invention.

[0078] For example, in the present embodiment, the vehicle V is equipped with an internal combustion engine ICE, but may be an electric vehicle that does not have an internal combustion engine ICE. Also, in the present embodiment, the vehicle V is equipped with a generator 30, but may be a vehicle that does not have the generator 30.

[0079] This specification describes at least the following items. In parentheses, components corresponding to the above-described embodiment are shown as examples, but the present invention is not limited to these.

[0080] (1) A vehicle temperature control system (vehicle temperature control system 10) that is mounted on a vehicle (vehicle V) including a rotating electric machine (electric motor 20), a transmission (transmission 40), and a power conversion device (power conversion device 50) that controls power supplied to the rotating electric machine, The vehicle temperature control system includes: a first temperature control circuit (first temperature control circuit 61) in which a first pump (first pump 611) is provided and a first temperature control medium (first temperature control medium TCM1) circulates to control the temperature of the rotating electric machine and the transmission; a second temperature control circuit (second temperature control circuit 62) in which a second pump (second pump 621) is provided and a second temperature control medium (second temperature control medium TCM2) circulates to control the temperature of the power conversion device; a heat exchanger (heat exchanger 63) for exchanging heat between the first temperature control medium and the second temperature control medium; a flow rate control valve (valve device 626) for controlling the flow rate of the second temperature control medium flowing through the heat exchanger; A control device (control device ECU) that controls the flow rate regulating valve. The second temperature control circuit is a pressure-feeding flow path (pressure-feeding flow path 620a) provided with the second pump, a branching portion (branching portion 624) at one end, and a junction portion (junction portion 625) at the other end; a first branch flow path (first branch flow path 620b1) in which the power conversion device is provided, one end of which is connected to the branching portion and the other end of which is connected to the junction portion; a second branch flow path (second branch flow path 620b2) in which the heat exchanger and the flow rate adjustment valve are provided, one end of which is connected to the branch portion and the other end of which is connected to the junction portion, and which is formed in parallel with the first branch flow path; A radiator (radiator 622) for exchanging heat between the second temperature control medium and outside air is provided in the pressure-feeding passage, The control device includes: a first temperature control medium temperature detection unit (first temperature control medium temperature detection unit 71) that detects the temperature of the first temperature control medium; A valve opening / closing control unit (valve opening / closing control unit 73) that controls the opening and closing of the flow rate adjustment valve, The valve opening / closing control unit is When the temperature of the first temperature control medium detected by the first temperature control medium temperature detection unit is lower than a predetermined temperature (predetermined temperature Tset1), the flow rate adjustment valve is controlled to be closed; When the temperature of the first temperature control medium detected by the first temperature control medium temperature detection unit becomes equal to or higher than the predetermined temperature while the flow rate control valve is closed, the flow rate control valve is controlled to open. Vehicle temperature control system.

[0081] According to (1), when cooling of the rotating electric machine is required, the rotating electric machine is cooled by the first temperature control medium, and when cooling of the rotating electric machine is not required, the temperature of the first temperature control medium is raised, thereby improving the fuel efficiency of the vehicle.

[0082] (2) The vehicle temperature control system according to (1), The control device includes: A vehicle speed detection unit (vehicle speed detection unit 74) that detects the vehicle speed of the vehicle; A gradient angle detection unit (gradient angle detection unit 75) that detects the gradient angle of a road surface on which the vehicle is traveling; and an uphill travel determination unit (uphill travel determination unit 76) that determines whether the vehicle is traveling uphill based on the detection values ​​of the vehicle speed detection unit and the gradient angle detection unit, The valve opening / closing control unit is even if the temperature of the first temperature control medium detected by the first temperature control medium temperature detection unit is lower than the predetermined temperature, when the climbing travel determination unit determines that the vehicle is traveling uphill, the flow rate adjustment valve is controlled to be opened. Vehicle temperature control system.

[0083] According to (2), even if the temperature of the first temperature-control medium detected by the first temperature-control medium temperature detection unit is below a predetermined temperature, when the vehicle is traveling in a manner that makes the rotating motor more likely to generate heat than during normal traveling, the rotating motor can be quickly cooled.

[0084] (3) The vehicle temperature control system according to (1), The control device includes: The vehicle further includes a slip determination unit (slip determination unit 77) that determines whether or not at least one wheel of the vehicle is spinning, The valve opening / closing control unit is Even if the temperature of the first temperature control medium detected by the first temperature control medium temperature detection unit is lower than the predetermined temperature, when the slip determination unit determines that at least one wheel of the vehicle is spinning, the flow rate control valve is controlled to be opened. Vehicle temperature control system.

[0085] According to (3), even if the temperature of the first temperature-control medium detected by the first temperature-control medium temperature detection unit is below a predetermined temperature, when the vehicle is traveling in a manner that makes the rotating motor more likely to generate heat than during normal traveling, the rotating motor can be quickly cooled.

[0086] (4) The vehicle temperature control system according to (1), The control device includes: Further, a driving torque detection unit (driving torque detection unit 78) is provided for detecting a driving torque of the vehicle. The valve opening / closing control unit is Even if the temperature of the first temperature control medium detected by the first temperature control medium temperature detection unit is lower than the predetermined temperature, when the driving torque detected by the driving torque detection unit is equal to or higher than a predetermined value, the flow rate adjustment valve is controlled to be opened. Vehicle temperature control system.

[0087] According to (4), even if the temperature of the first temperature-control medium detected by the first temperature-control medium temperature detection unit is below a predetermined temperature, the rotating electric motor can be cooled quickly when the vehicle is performing towing or other driving, in which the rotating electric motor is more likely to generate heat than during normal driving.

[0088] (5) A vehicle (vehicle V) including a rotating electric machine (electric motor 20), a transmission (transmission 40), a power conversion device (power conversion device 50) that controls power supplied to the rotating electric machine, and a vehicle temperature control system (vehicle temperature control system 10), The vehicle temperature control system includes: a first temperature control circuit (first temperature control circuit 61) in which a first pump (first pump 611) is provided and a first temperature control medium (first temperature control medium TCM1) circulates to control the temperature of the rotating electric machine and the transmission; a second temperature control circuit (second temperature control circuit 62) in which a second pump (second pump 621) is provided and a second temperature control medium (second temperature control medium TCM2) circulates to control the temperature of the power conversion device; a heat exchanger (heat exchanger 63) for exchanging heat between the first temperature control medium and the second temperature control medium; a flow rate control valve (valve device 626) for controlling the flow rate of the second temperature control medium flowing through the heat exchanger; A control device (control device ECU) that controls the flow rate regulating valve. The second temperature control circuit is a pressure-feeding flow path (pressure-feeding flow path 620a) provided with the second pump, a branching portion (branching portion 624) at one end, and a junction portion (junction portion 625) at the other end; a first branch flow path (first branch flow path 620b1) in which the power conversion device is provided, one end of which is connected to the branching portion and the other end of which is connected to the junction portion; a second branch flow path (second branch flow path 620b2) in which the heat exchanger and the flow rate adjustment valve are provided, one end of which is connected to the branch portion and the other end of which is connected to the junction portion, and which is formed in parallel with the first branch flow path; A radiator (radiator 622) for exchanging heat between the second temperature control medium and outside air is provided in the pressure-feeding passage, The control device includes: a first temperature control medium temperature detection unit (first temperature control medium temperature detection unit 71) that detects the temperature of the first temperature control medium; A valve opening / closing control unit (valve opening / closing control unit 73) that controls the opening and closing of the flow rate adjustment valve, The valve opening / closing control unit is When the temperature of the first temperature control medium detected by the first temperature control medium temperature detection unit is lower than a predetermined temperature (predetermined temperature Tset1), the flow rate adjustment valve is controlled to be closed; When the temperature of the first temperature control medium detected by the first temperature control medium temperature detection unit becomes equal to or higher than the predetermined temperature while the flow rate control valve is closed, the flow rate control valve is controlled to open. vehicle.

[0089] According to (5), when cooling of the rotating electric machine is required, the rotating electric machine is cooled by the first temperature control medium, and when cooling of the rotating electric machine is not required, the temperature of the first temperature control medium is raised, thereby improving the fuel efficiency of the vehicle. [Explanation of symbols]

[0090] 10 Vehicle temperature control system 20 Electric motor (rotating electric motor) 40 Gearbox 50 Power conversion device 61 1st temperature control circuit 611 First Pump 62 2nd temperature control circuit 620a Pressure flow path 620b1 First branch flow path 620b2 Second branch flow path 621 Second Pump 622 Radiator 624 Branch 625 Junction 626 Valve equipment (flow control valve) 63 Heat exchanger 71 First temperature control medium temperature detector 73 Valve opening / closing control section 74 Vehicle speed detection unit 75 Gradient angle detector 76 Climbing Determination Unit 77 Slip Judgment Section 78 Driving torque detector ECU Control Unit TCM1 1st temperature control medium TCM2 Second temperature control medium Tset1 Predetermined temperature V Vehicle

Claims

1. A vehicle temperature control system that is mounted on a vehicle including a rotating electric machine, a transmission, and a power conversion device that controls power supplied to the rotating electric machine, The vehicle temperature control system includes: a first temperature control circuit including a first pump and through which a first temperature control medium circulates to control the temperatures of the rotating electric machine and the transmission; a second temperature control circuit including a second pump and through which a second temperature control medium circulates to control the temperature of the power conversion device; a heat exchanger that exchanges heat between the first temperature control medium and the second temperature control medium; a flow rate regulating valve that regulates a flow rate of the second temperature control medium flowing through the heat exchanger; A control device for controlling the flow rate regulating valve. The second temperature control circuit is a pressure-feeding flow path provided with the second pump, the pressure-feeding flow path having a branching portion at one end and a junction portion at the other end; a first branch flow path having the power converter, one end of the first branch flow path being connected to the branch portion and the other end of the first branch flow path being connected to the junction portion; a second branch flow path provided with the heat exchanger and the flow rate regulating valve, one end of the second branch flow path connected to the branch portion and the other end of the second branch flow path connected to the junction portion, the second branch flow path being formed in parallel with the first branch flow path, a radiator that performs heat exchange between the second temperature control medium and outside air is provided in the pressure-feeding passage, The control device includes: a first temperature control medium temperature detection unit that detects a temperature of the first temperature control medium; a valve opening / closing control unit that controls the opening and closing of the flow rate regulating valve, The valve opening / closing control unit is When the temperature of the first temperature control medium detected by the first temperature control medium temperature detection unit is lower than a predetermined temperature, the flow rate adjustment valve is controlled to be closed; When the temperature of the first temperature control medium detected by the first temperature control medium temperature detection unit becomes equal to or higher than the predetermined temperature while the flow rate control valve is closed, the flow rate control valve is controlled to open. Vehicle temperature control system.

2. The vehicle temperature control system according to claim 1, The control device includes: a vehicle speed detection unit for detecting a vehicle speed of the vehicle; a gradient angle detection unit that detects a gradient angle of a road surface on which the vehicle is traveling; an uphill travel determination unit that determines whether the vehicle is traveling uphill based on the detection values ​​of the vehicle speed detection unit and the gradient angle detection unit, The valve opening / closing control unit is When the climbing travel determination unit determines that the vehicle is traveling uphill even if the temperature of the first temperature control medium detected by the first temperature control medium temperature detection unit is lower than the predetermined temperature, the flow rate control valve is controlled to be opened. Vehicle temperature control system.

3. The vehicle temperature control system according to claim 1, The control device includes: The vehicle further includes a slip determination unit that determines whether or not at least one wheel of the vehicle is spinning, The valve opening / closing control unit is Even if the temperature of the first temperature control medium detected by the first temperature control medium temperature detection unit is lower than the predetermined temperature, when the slip determination unit determines that at least one wheel of the vehicle is spinning, the flow rate control valve is controlled to be opened. Vehicle temperature control system.

4. The vehicle temperature control system according to claim 1, The control device includes: A driving torque detection unit detects a driving torque of the vehicle. The valve opening / closing control unit is Even if the temperature of the first temperature control medium detected by the first temperature control medium temperature detection unit is lower than the predetermined temperature, when the driving torque detected by the driving torque detection unit is equal to or higher than a predetermined value, the flow rate adjustment valve is controlled to be opened. Vehicle temperature control system.

5. A vehicle including a rotating electric machine, a transmission, a power conversion device that controls power supplied to the rotating electric machine, and a vehicle temperature control system, The vehicle temperature control system includes: a first temperature control circuit including a first pump and through which a first temperature control medium circulates to control the temperatures of the rotating electric machine and the transmission; a second temperature control circuit including a second pump and through which a second temperature control medium circulates to control the temperature of the power conversion device; a heat exchanger that exchanges heat between the first temperature control medium and the second temperature control medium; a flow rate regulating valve that regulates a flow rate of the second temperature control medium flowing through the heat exchanger; A control device for controlling the flow rate regulating valve. The second temperature control circuit is a pressure-feeding flow path provided with the second pump, the pressure-feeding flow path having a branching portion at one end and a junction portion at the other end; a first branch flow path having the power converter, one end of the first branch flow path being connected to the branch portion and the other end of the first branch flow path being connected to the junction portion; a second branch flow path provided with the heat exchanger and the flow rate regulating valve, one end of the second branch flow path connected to the branch portion and the other end of the second branch flow path connected to the junction portion, the second branch flow path being formed in parallel with the first branch flow path, a radiator that performs heat exchange between the second temperature control medium and outside air is provided in the pressure-feeding passage, The control device includes: a first temperature control medium temperature detection unit that detects a temperature of the first temperature control medium; a valve opening / closing control unit that controls the opening and closing of the flow rate regulating valve, The valve opening / closing control unit is When the temperature of the first temperature control medium detected by the first temperature control medium temperature detection unit is lower than a predetermined temperature, the flow rate adjustment valve is controlled to be closed; When the temperature of the first temperature control medium detected by the first temperature control medium temperature detection unit becomes equal to or higher than the predetermined temperature while the flow rate control valve is closed, the flow rate control valve is controlled to open. vehicle.

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