Vehicle temperature control system

Abstract

The present invention provides a technology capable of suppressing friction losses in rotating electrical machines. A vehicle temperature control system includes: a first temperature control circuit that controls the temperature of the electric motor and generator; a second temperature control circuit that controls the temperature of the power conversion device; and a heat exchanger that performs heat exchange between a first temperature control medium and a second temperature control medium. The second temperature control circuit includes: a first radiator that performs heat exchange between the second temperature control medium and the outside air; a first branch flow path for the second temperature control medium that bypasses the heat exchanger; a second branch flow path for the second temperature control medium that passes through the heat exchanger; and a valve device that adjusts the flow rate of the second temperature control medium into the second branch flow path.

Description

Technical Field

[0001] The present invention relates to a vehicle temperature adjustment system mounted on an electric vehicle or the like. Background Art

[0002] Conventionally, vehicles equipped with rotating electric machines and power conversion devices, such as electric vehicles, are already known. Generally, these machines generate heat during operation, so vehicles equipped with these devices are equipped with a vehicle temperature control system to regulate the temperature of the rotating electric machines and power conversion devices.

[0003] For example, Patent Document 1 discloses a vehicle temperature control system comprising: a circulation path L through which oil circulates to cool an electric motor M; a circulation path F through which cooling water circulates to cool an inverter U; and a heat exchange unit (oil cooler C) that exchanges heat between the cooling water flowing through circulation path F and the oil flowing through circulation path L. A radiator R is provided in circulation path F, and the cooling water flowing through circulation path F is cooled by radiator R. The oil flowing through circulation path L is cooled by the heat exchange unit (oil cooler C) through the heat exchange between the cooling water flowing through circulation path F and the oil flowing through circulation path L. Therefore, the vehicle temperature control system of Patent Document 1 does not require a radiator for cooling the oil. Instead, a single radiator can be used to cool both the cooling water flowing through circulation path F and the oil flowing through circulation path L, thereby enabling a more compact vehicle temperature control system.

[0004] Patent document 2 discloses a vehicle cooling device that reduces the discharge volume of an electric water pump to increase the temperature of the engine oil when the temperature of the engine oil is lower than a specified value, and changes the discharge volume of the electric water pump in proportion to the vehicle speed to lower the temperature of the engine oil when the temperature of the engine oil is higher than a specified value, thereby cooling the engine oil.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2001-238406

[0008] Patent Document 2: Japanese Patent Application Publication No. 2019-103334 Summary of the Invention

[0009] Problems to be solved by the invention

[0010] In order to suppress friction losses in rotating electrical machines such as electric motors, it is preferable to maintain the oil lubricating the rotating electrical machines at an appropriate temperature. However, in the structure of Patent Document 1, heat exchange is always performed between the oil used to cool the electric motor M and the cooling water used to cool the inverter U, so there is a problem of difficulty in adjusting the temperature of the oil.

[0011] Furthermore, in the configuration of Patent Document 2, since the heat exchanger 12 is connected in series with the inverter cooling circuit 10 that cools the inverter 2, heat exchange is constantly occurring between the T / M oil circuit 20 that cools the first and second motors 3 and 4 and the inverter cooling circuit 10. This leads to a problem of poor efficiency when the first and second motors 3 and 4 are heated. Furthermore, in the configuration of Patent Document 2, since the same flow rate of cooling water is constantly supplied to the heat exchanger 12, the flow resistance increases, necessitating a high-output pump.

[0012] The present invention provides a vehicle temperature adjustment system capable of suppressing friction loss of a rotating electric machine.

[0013] Means for solving problems

[0014] The present invention provides a vehicle temperature control system, comprising:

[0015] a first temperature adjustment circuit, which adjusts the temperature of the rotating electrical machine and is provided with a first pump;

[0016] a second temperature adjustment circuit that adjusts the temperature of the power conversion device and is provided with a second pump; and

[0017] A heat exchanger performs heat exchange between a first temperature adjustment medium circulating in the first temperature adjustment circuit and a second temperature adjustment medium circulating in the second temperature adjustment circuit.

[0018] The second temperature adjustment circuit comprises:

[0019] a first radiator for performing heat exchange between the second temperature adjustment medium and external air;

[0020] a first branch flow path of the second temperature adjustment medium bypassing the heat exchanger;

[0021] a second branch flow path of the second temperature adjustment medium passing through the heat exchanger; and

[0022] A flow regulating valve is configured to regulate a flow rate of the second temperature regulating medium to the second branch flow path.

[0023] Effects of the Invention

[0024] According to the present invention, friction loss of a rotating electrical machine can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a block diagram of a vehicle temperature control system according to an embodiment of the present invention.

[0026] Figure 2 This is a diagram showing an example of control of the valve device in response to an increase in the required output of the electric motor.

[0027] Figure 3 This is a flowchart showing an example of control of the rotational speed of the second pump based on the temperatures detected by the temperature sensors.

[0028] Figure 4 This is a diagram showing an example of the front portion of a vehicle.

[0029] Figure 5 This is a flowchart showing an example of control of the valve device based on the vehicle speed.

[0030] Description of Reference Numerals

[0031] 10 Vehicle temperature control system

[0032] 20 Electric motor (rotating motor)

[0033] 20a Third temperature sensor

[0034] 30 Generator (rotating electrical machine)

[0035] 50 Power conversion device

[0036] 50a Fourth temperature sensor

[0037] 61 First temperature adjustment circuit

[0038] 61a First temperature sensor

[0039] 611 First Pump

[0040] 62 Second temperature adjustment circuit

[0041] 62a Second temperature sensor

[0042] 403 First Radiator

[0043] 620b1 First branch flow path

[0044] 620b2 Second branch flow path

[0045] 621 Second Pump

[0046] 626 Valve device (flow control valve)

[0047] 63 Heat Exchanger

[0048] ECU control unit

[0049] TCM1 First temperature control medium

[0050] TCM2 Second temperature adjustment medium

[0051] V Vehicle (electric vehicle). DETAILED DESCRIPTION

[0052] The following describes one embodiment of a vehicle equipped with the vehicle temperature control system of the present invention, based on the accompanying drawings. It should be noted that the drawings are viewed in the orientation of the symbols. Furthermore, in this specification and other documents, for simplicity and clarity, the front, rear, left, right, and up and down directions are described as viewed from the perspective of the vehicle driver. In the accompanying drawings, the front of the vehicle is represented as Fr, the rear as Rr, the left as L, the right as R, the top as U, and the bottom as D.

[0053] [Implementation Method]

[0054] First, refer to Figure 1 A vehicle temperature adjustment system 10 according to an embodiment of the present invention will be described.

[0055] like Figure 1 As shown, the vehicle temperature control system 10 of this embodiment is mounted on a vehicle V and includes an internal combustion engine ICE, a control unit ECU, a motor 20 , a generator 30 , a transmission 40 , a power conversion device 50 , and a temperature control circuit 60 .

[0056] The electric motor 20 is a rotating electrical machine that outputs power to drive the vehicle V using electricity stored in a power storage device (not shown) mounted on the vehicle V or electricity generated by the generator 30. The electric motor 20 can also generate electricity using the kinetic energy of the vehicle V's drive wheels during braking to charge the power storage device. The electric motor 20 is equipped with a third temperature sensor 20a for detecting the temperature of the electric motor 20. The third temperature sensor 20a outputs the detected temperature value of the electric motor 20 to the control unit ECU.

[0057] The generator 30 is a rotating electric machine that generates electricity using the power of the internal combustion engine ICE to charge the aforementioned power storage device or to supply electric power to the electric motor 20 .

[0058] The transmission 40 is a device that reduces the speed of power output from the electric motor 20 and transmits the speed to the drive wheels, and is, for example, a gear-type power transmission device.

[0059] The power conversion device 50 includes: a power drive unit (PDU) (not shown), which converts the power output from the aforementioned power storage device from DC to AC to control the input and output power of the motor 20 and the generator 30; and a voltage control unit (VCU) (not shown), which boosts the power output from the aforementioned power storage device as needed. The VCU can also step down the power generated by the motor 20 when the motor 20 generates power during braking of the vehicle V. The power conversion device 50 is provided with a fourth temperature sensor 50a for detecting the temperature of the power conversion device 50. The fourth temperature sensor 50a outputs the detected value of the temperature of the power conversion device 50 to the control unit ECU.

[0060] The temperature control circuit 60 includes a first temperature control circuit 61 through which a non-conductive first temperature control medium TCM1 circulates to control the temperature of the motor 20, generator 30, and transmission 40; a second temperature control circuit 62 through which a conductive second temperature control medium TCM2 circulates to control the temperature of the power conversion device 50; and a heat exchanger 63 for exchanging 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, automatic transmission fluid (ATF), which can lubricate and control the temperature of the motor 20, generator 30, and transmission 40. The conductive second temperature control medium TCM2 is, for example, cooling water, such as long-life refrigerant (LLC).

[0061] The first temperature control circuit 61 is provided with a first pump 611 and a reservoir 612. The first pump 611 is a mechanical pump driven by the power of the internal combustion engine ICE and the rotational force of the axle (not shown) of the vehicle V. The reservoir 612 stores the first temperature control medium TCM1 that circulates through the first temperature control circuit 61. The reservoir 612 is, for example, an oil pan located at the bottom of a housing (not shown) housing the electric motor 20, the generator 30, and the transmission 40. The first temperature control circuit 61 has a branch portion 613. The first temperature adjustment circuit 61 includes a pressurized feed flow path 610a, which is provided with a first pump 611 and whose upstream end is connected to a reservoir 612 and whose downstream end is connected to a branch portion 613 via the first pump 611. A first branch flow path 610b1, which is provided with the motor 20 and the generator 30 and whose upstream end is connected to the branch portion 613 and whose downstream end is connected to the reservoir 612 via the motor 20 and the generator 30. A second branch flow path 610b2, which is provided with the speed change device 40 and whose upstream end is connected to the branch portion 613 and whose downstream end is connected to the reservoir 612 via the speed change device 40. In the first temperature adjustment circuit 61, a heat exchanger 63 is disposed in the first branch flow path 610b1, upstream of the motor 20 and the generator 30.

[0062] Therefore, the first temperature control circuit 61 has two parallel flow paths: a flow path in which the first temperature control medium TCM1, pressurized and delivered by the first pump 611, passes through the first branch flow path 610b1 from the branch portion 613, exchanges heat with the second temperature control medium TCM2 in the heat exchanger 63, is cooled, and is supplied to the motor 20 and generator 30 to lubricate and regulate their temperature, before being stored in the reservoir 612; and a flow path in which the first temperature control medium TCM1, pressurized and delivered by the first pump 611, passes through the second branch flow path 610b2 from the branch portion 613 to the transmission 40 to lubricate and regulate their temperature, before being stored in the reservoir 612. The first temperature control medium TCM1 stored in the reservoir 612 flows through the pressurized delivery flow path 610a and is supplied to the first pump 611, thereby circulating in the first temperature control circuit 61.

[0063] In this embodiment, the first branch channel 610b1 and the second branch channel 610b2 are formed so that the flow rate of the first temperature control medium TCM1 flowing through the first branch channel 610b1 is greater than the flow rate of the first temperature control medium TCM1 flowing through the second branch channel 610b2.

[0064] The first temperature control circuit 61 is provided with a first temperature sensor 61a for detecting the temperature of the first temperature control medium TCM1 circulating in the first temperature control circuit 61. In the present embodiment, the first temperature sensor 61a is provided in a reservoir 612, which serves as an oil pan, and detects the temperature of the first temperature control medium TCM1 stored in the reservoir 612. The first temperature sensor 61a outputs the detected value of the temperature of the first temperature control medium TCM1 stored in the reservoir 612 to the control unit ECU.

[0065] The first temperature adjustment circuit 61 also includes a pressure regulating circuit 610c, whose upstream end is connected to the storage unit 612, and whose downstream end is connected to the pressurized delivery flow path 610a at a position downstream of the first pump 611. A pressure regulating valve 619 is provided in the pressure regulating circuit 610c. The pressure regulating valve 619 can be a check valve or an electromagnetic valve such as an electromagnetic reversing valve. When the hydraulic pressure of the first temperature adjustment medium TCM1 pressurized and delivered from the first pump 611 reaches a predetermined pressure or above, the pressure regulating valve 619 becomes open, and a portion of the first temperature adjustment medium TCM1 pressurized and delivered from the first pump 611 returns to the storage unit 612. As a result, the hydraulic pressure of the first temperature adjustment medium TCM1 flowing in the first branch flow path 610b1 and the second branch flow path 610b2 is maintained below the predetermined pressure.

[0066] The second temperature control circuit 62 is provided with a second pump 621, a radiator 622, and a storage tank 623. The second pump 621 is, for example, an electric pump driven by the electricity stored in the aforementioned power storage device. The radiator 622 is located at the front of the vehicle V and is a heat dissipation device that cools the second temperature control medium TCM2 using the wind generated by the vehicle V during travel. The storage tank 623 is a tank that temporarily stores 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 in the second temperature control circuit 62, the temporary storage of the second temperature control medium TCM2 in the storage tank 623 eliminates the cavitation.

[0067] The second temperature control circuit 62 includes a branch portion 624 and a confluence portion 625. The second temperature control circuit 62 is provided with, in order from the upstream side, a reservoir tank 623, a second pump 621, and a radiator 622. The second temperature control circuit 62 includes a pressurized feed flow path 620a, the upstream end of which is connected to the confluence portion 625 and the downstream end of which is connected to the branch portion 624 via the reservoir tank 623, the second pump 621, and the radiator 622. The second temperature control medium TCM2 stored in the reservoir tank 623 is pressurized and fed by the second pump 621 through the pressurized feed flow path 620a and cooled by the radiator 622.

[0068] The second temperature control circuit 62 further includes a first branch flow path 620b1, which is provided with the power conversion device 50 and whose upstream end is connected to the branch portion 624 and whose downstream end is connected to the confluence portion 625 via the power conversion device 50; and a second branch flow path 620b2, which is provided with the heat exchanger 63 and whose upstream end is connected to the branch portion 624 and whose downstream end is connected to the confluence portion 625 via the heat exchanger 63. In this embodiment, a valve device 626 serving as a flow control valve is provided in the portion of the second branch flow path 620b2 upstream of the heat exchanger 63. In this embodiment, the valve device 626 can be an on-off valve that switches the second branch flow path 620b2 between fully open and fully closed, or a variable flow valve that can adjust the flow rate of the second temperature control medium TCM2 flowing through the second branch flow path 620b2. The valve device 626 is controlled by the control unit ECU.

[0069] Therefore, the second temperature control medium TCM2, which is pressurized and fed by the second pump 621 in the pressurized feed flow path 620a and cooled by the radiator 622, branches into a first branch flow path 620b1 and a second branch flow path 620b2 at a branching portion 624. The second temperature control medium TCM2 flowing through the first branch flow path 620b1 cools the power conversion device 50 and merges with the second branch flow path 620b2 and the pressurized feed flow path 620a at a confluence portion 625. The second temperature control medium TCM2 flowing through the second branch flow path 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 flow path 620b1 and the pressurized feed flow path 620a at a confluence portion 625. The second temperature control medium TCM2 flowing through the first branch flow path 620b1 and the second temperature control medium TCM2 flowing through the second branch flow path 620b2 merge at the confluence portion 625, flow through the pressurized delivery 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 via the pressurized delivery flow path 620a, and the second temperature control medium TCM2 circulates in the second temperature control circuit 62.

[0070] 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.

[0071] The first temperature control circuit 62 is provided with a second temperature sensor 62a, which detects the temperature of the second temperature control medium TCM2 circulating in the second temperature control circuit 62. In the present embodiment, the second temperature sensor 62a is disposed in the pressurized feed flow path 620a between the radiator 622 and the branch portion 624, and detects the temperature of the second temperature control medium TCM2 stored in the storage tank 623. The second temperature sensor 62a outputs the detected temperature value of the second temperature control medium TCM2 discharged from the radiator 622 to the control unit ECU.

[0072] In the first temperature control circuit 61 , the temperature of the first temperature control medium TCM1 stored in the storage portion 612 after cooling the 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 .

[0073] On the other hand, in the second temperature control circuit 62, the temperature of the second temperature control medium TCM2 after being cooled by the radiator 622 is approximately 40°C. Since the second temperature control medium TCM2 supplied to the heat exchanger 63 does not pass through the power conversion device 50, which is the device to be temperature-controlled, the second temperature control medium TCM2 at approximately 40°C is supplied to the heat exchanger 63.

[0074] The heat exchanger 63 exchanges heat between the first temperature control medium TCM1 at approximately 100°C and the second temperature control medium TCM2 at approximately 40°C supplied to the heat exchanger 63. The first temperature control medium TCM1 at approximately 80°C is then discharged from the heat exchanger 63 to the downstream side of the first branch flow path 610b1 of the first temperature control circuit 61, and the second temperature control medium TCM2 at approximately 70°C is discharged to the downstream side of the second branch flow path 620b2 of the second temperature control circuit 62.

[0075] In this manner, the first temperature control medium TCM1 is cooled in 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 both 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 using a single radiator 622, thereby miniaturizing the temperature control circuit 60.

[0076] The control unit ECU controls the internal combustion engine ICE, the power conversion device 50, the second pump 621, and the valve device 626. A rotation speed sensor 621a is mounted on the second pump 621 to detect the rotation speed of the second pump 621. The rotation speed sensor 621a outputs the detected rotation speed value of the second pump 621 to the control unit ECU.

[0077] return Figure 1 When the first temperature control medium TCM1 is ATF, as the temperature of the first temperature control medium TCM1 decreases, the viscosity of the first temperature control medium TCM1 increases. Since the first temperature control medium TCM1 flows through the motor 20 and the generator 30, a higher viscosity increases frictional losses in the motor 20 and the generator 30, reducing the output efficiency of the motor 20 and the generator 30. Therefore, when the motor 20 and the generator 30 are not yet heated and the temperature of the first temperature control medium TCM1 is below a predetermined temperature, cooling of the first temperature control medium TCM1 is unnecessary and preferably not performed.

[0078] When the temperature of the first temperature control medium TCM1 outputted from the first temperature sensor 61a is lower than a predetermined temperature, the control unit ECU controls the valve device 626 to fully close the valve device 626 and block the flow of the second temperature control medium TCM2 through the second branch flow path 620b2.

[0079] When the second temperature control medium TCM2 is shut off from flowing through the second branch flow path 620b2, the second temperature control medium TCM2 is not supplied to the heat exchanger 63. Therefore, heat exchange does not occur between the first temperature control medium TCM1 and the second temperature control medium TCM2, and the first temperature control medium TCM1 is not cooled. Therefore, when cooling of the first temperature control medium TCM1 is not required, the first temperature control medium TCM1 can be prevented from being cooled by the heat exchanger 63. This can suppress any increase in frictional losses in the motor 20 and the generator 30.

[0080] In this way, the second temperature adjustment circuit 62 for adjusting the temperature of the power conversion device 50 includes a first branch flow path 620b1 for the second temperature adjustment medium TCM2 that bypasses the heat exchanger 63; a second branch flow path 620b2 for the second temperature adjustment medium TCM2 that passes through the heat exchanger 63; and a valve device 626 (flow adjustment valve), which adjusts the flow of the second temperature adjustment medium TCM2 to the first branch flow path 620b1.

[0081] This allows the flow of the second temperature control medium TCM2 into the heat exchanger 63 to be regulated, thereby suppressing a decrease in the temperature of the first temperature control medium TCM1 caused by heat exchange between the first temperature control medium TCM1 and the second temperature control medium TCM2 used for temperature control of the electric motor 20 and the generator 30 (rotating electric machine), thereby suppressing friction losses generated in the electric motor 20 and the generator 30. Consequently, a decrease in the output efficiency of the electric motor 20 and the generator 30 can be suppressed.

[0082] For example, when the temperature detected by the first temperature sensor 61a for detecting the temperature of the first temperature adjustment medium TCM1 is below a threshold value (prescribed value), the control unit ECU controls the valve device 626 so that the flow rate of the second temperature adjustment medium TCM2 to the second branch flow path 620b2 becomes smaller than when the temperature detected by the first temperature sensor 61a exceeds the threshold value.

[0083] Controlling the valve device 626 to reduce the flow rate of the second temperature control medium TCM2 into the second branched flow path 620b2 also includes fully closing the valve device 626 to prevent the second temperature control medium TCM2 from flowing into the second branched flow path 620b2. For example, the control unit ECU fully closes the valve device 626 when the temperature detected by the first temperature sensor 61a is below a threshold value, and fully opens the valve device 626 when the temperature detected by the first temperature sensor 61a exceeds the threshold value.

[0084] Thus, when the temperature of the first temperature control medium TCM1 is below a threshold, the flow of the second temperature control medium TCM2 into the heat exchanger 63 can be restricted, thereby suppressing heat exchange between the first temperature control medium TCM1 and the second temperature control medium TCM2 and suppressing a decrease in the temperature of the first temperature control medium TCM1. This threshold is, for example, a threshold TH0 described later. Regarding the control of the valve device 626 based on the comparison between the temperature of the first temperature control medium TCM1 and the threshold TH0, Figure 3 To be discussed later.

[0085] In addition, when the temperature detected by the third temperature sensor 20a for detecting the temperature of the electric motor 20 is below a threshold value, the control unit ECU may control the valve device 626 so that the flow rate of the second temperature adjustment medium TCM2 to the second branch flow path 620b2 becomes smaller than when the temperature detected by the third temperature sensor 20a exceeds the threshold value.

[0086] Thus, by limiting the flow of the second temperature control medium into the heat exchanger when the temperature of the motor 20 is below the threshold, it is possible to suppress heat exchange between the first temperature control medium TCM1 and the second temperature control medium TCM2 and suppress a decrease in the temperature of the first temperature control medium TCM1 when there is little demand for cooling of the motor 20.

[0087] Alternatively, the third temperature sensor 20a may be a sensor that detects the temperature of the generator 30 rather than the motor 20. In this case, when the temperature detected by the third temperature sensor 20a that detects the temperature of the generator 30 is below a threshold value, the control unit ECU may control the valve device 626 so that the flow rate of the second temperature control medium TCM2 into the second branch flow path 620b2 is reduced compared to when the temperature detected by the third temperature sensor 20a exceeds the threshold value.

[0088] Thus, by limiting the flow of the second temperature control medium into the heat exchanger when the temperature of the generator 30 is below the threshold, it is possible to suppress heat exchange between the first temperature control medium TCM1 and the second temperature control medium TCM2, and suppress a decrease in the temperature of the first temperature control medium TCM1, while almost no cooling of the generator 30 is required.

[0089] Reference Figure 2 , the control of the valve device 626 according to the increase in the required output of the electric motor 20 will be described. Figure 2 The temperature threshold characteristic 201 is, for example, information stored in a memory accessible by the control unit ECU, and indicates the temperature threshold (prescribed value) for controlling the valve device 626 in accordance with the required output of the electric motor 20 in the vehicle V. The required output refers to the output required of the electric motor 20 and is based on, for example, information such as the accelerator pedal opening of the vehicle V and the vehicle speed of the vehicle V.

[0090] In temperature threshold characteristic 201, the higher the required output of motor 20, the lower the temperature threshold. Control unit ECU may also obtain a threshold value corresponding to the required output of motor 20 according to temperature threshold characteristic 201 and use the obtained threshold value to control valve device 626 based on the temperature.

[0091] Specifically, as described above, the control unit ECU compares the temperatures detected by the first temperature sensor 61a and the third temperature sensor 20a with a threshold value. If the temperature is below the threshold value, the control unit ECU controls the valve device 626 so that the flow rate of the second temperature control medium TCM2 into the second branch flow path 620b2 is reduced compared to when the temperature exceeds the threshold value. Furthermore, the control unit ECU decreases the threshold value as the required output of the electric motor 20 increases.

[0092] In this manner, the control unit ECU can also reduce the temperature threshold (prescribed value) of the control valve device 626 in response to an increase in the required output of the electric motor 20. For example, if the temperatures of the first temperature control medium TCM1 and the electric motor 20 are low and the valve device 626 is closed, preventing heat exchange between the first temperature control medium TCM1 and the second temperature control medium TCM2, the threshold value can be reduced if the required output of the electric motor 20 increases. This allows the valve device 626 to be opened and heat exchange between the first temperature control medium TCM1 and the second temperature control medium TCM2 to begin before the temperature of the electric motor 20 actually rises, cooling the first temperature control medium TCM1 and thereby suppressing a temperature increase in the electric motor 20.

[0093] Furthermore, the control unit ECU may adjust the threshold value (predetermined value) of the temperature of the control valve device 626 based on the driving mode of the vehicle V. The driving mode refers to a driving mode of the vehicle V that differs in whether or not the electric motor 20 is used.

[0094] For example, when the vehicle V is in a towing mode that places a high load on the electric motor 20, the control unit ECU sets a relatively low threshold for the temperature of the control valve device 626. This reduces the temperature rise of the electric motor 20 by accelerating the timing for opening the valve device 626 to cool the first temperature control medium TCM1.

[0095] Furthermore, when the vehicle V is in the lockup travel mode (engine direct coupling mode) in which the load on the electric motor 20 is low, the control unit ECU sets a relatively high threshold value for the temperature of the control valve device 626. Thus, by opening the valve device 626 and delaying the timing for cooling the first temperature control medium TCM1, a decrease in the temperature of the first temperature control medium TCM1 can be suppressed.

[0096] In this manner, the valve device 626 is controlled based on the travel mode of the vehicle V to change the timing for cooling the first temperature control medium TCM1 , thereby making it possible to appropriately adjust the temperature of the electric motor 20 .

[0097] In addition, the control unit ECU may control the rotation speed of the second pump 621 based on the temperature detected by each temperature sensor. Figure 3 The control of the rotation speed of the second pump 621 by the control unit ECU will be described. For example, when the ignition power of the vehicle V is turned on, the control unit ECU executes Figure 3 As an initial state, the valve device 626 is assumed to be fully open.

[0098] First, control unit ECU starts driving second pump 621 (step S301 ). Specifically, control unit ECU starts driving second pump 621 by inputting a drive signal having a predetermined duty ratio to second pump 621 .

[0099] Second pump 621 operates at a rotational speed corresponding to the duty cycle of a drive signal input from control unit ECU, thereby pressurizing and delivering second temperature control medium TCM2. The required rotational speed for second pump 621 is divided into three levels: Low, Mid, and Hi. Low is the lowest rotational speed, and Hi is the highest rotational speed.

[0100] Next, control unit ECU executes the processing of steps S302 to S310 and the processing of steps S311 to S317. These processes may be executed in parallel or sequentially.

[0101] In step S302, control unit ECU obtains the temperature of the first temperature control medium TCM1 detected by the first temperature sensor 61a (step S302). Next, control unit ECU determines whether the temperature obtained in step S302 is greater than or equal to threshold value TH0 (step S303). Threshold value TH0 is the minimum temperature of the first temperature control medium TCM1 at which friction loss generated in the motor 20 and the generator 30 does not become a problem, and can be set to 65°C, for example.

[0102] In step S303, if the temperature acquired in step S302 is not equal to or greater than the threshold value TH0 (step S303: No), the control unit ECU closes the valve device 626 (step S304) and the process proceeds to step S318. In this case, the temperature rise mode is selected, in which heat exchange between the first temperature control medium TCM1 and the second temperature control medium TCM2 in the heat exchanger 63 is not performed. In the temperature rise mode, the first temperature control medium TCM1 is not cooled by heat exchange with the second temperature control medium TCM2, so the temperature of the first temperature control medium TCM1 rises, which in turn increases the temperature of the motor 20, the generator 30, and the transmission 40.

[0103] If the temperature acquired in step S302 is equal to or greater than threshold TH0 (step S303: YES), control unit ECU determines whether the temperature acquired in step S302 is equal to or greater than first threshold TH1 (step S305). First threshold TH1 is a value higher than threshold TH0 and can be set to 70°C as an example.

[0104] In step S305 , when the temperature acquired in step S302 is not equal to or higher than first threshold value TH1 (step S305 : NO), control unit ECU sets the requested rotation speed of second pump 621 to Low (step S306 ), and the process proceeds to step S318 .

[0105] In step S305 , when the temperature acquired in step S302 is equal to or higher than first threshold value TH1 (step S305 : YES), control unit ECU acquires the temperature of electric motor 20 detected by third temperature sensor 20 a (step S307 ).

[0106] Next, control unit ECU determines whether the temperature acquired in step S307 is equal to or higher than a third threshold value TH3 (step S308). Third threshold value TH3 is a value higher than first threshold value TH1 and can be set to 80[°C] as an example.

[0107] In step S308, if the acquired temperature is not equal to or higher than third threshold value TH3 (step S308: No), control unit ECU sets the requested speed of second pump 621 to Mid (step S309), and the process proceeds to step S318. If the acquired temperature is equal to or higher than third threshold value TH3 (step S308: Yes), control unit ECU sets the requested speed of second pump 621 to Hi (step S310), and the process proceeds to step S318.

[0108] In step S311, control unit ECU obtains the temperature of the second temperature control medium TCM2 detected by the second temperature sensor 62a (step S311). Next, control unit ECU determines whether the temperature obtained in step S311 is greater than or equal to a second threshold value TH2 (step S312). The second threshold value TH2 is, for example, the same value as the first threshold value TH1 described above for comparison with the temperature of the first temperature control medium TCM1, and can be set to 70°C as an example. However, the temperature of the second temperature control medium TCM2 is typically lower than that of the first temperature control medium TCM1, so the second threshold value TH2 may also be a value lower than the first threshold value TH1.

[0109] In step S312 , when the temperature acquired in step S311 is not equal to or higher than second threshold value TH2 (step S312 : NO), control unit ECU sets the requested rotation speed of second pump 621 to Low (step S313 ), and the process proceeds to step S318 .

[0110] In step S312 , when the temperature acquired in step S311 is equal to or higher than second threshold value TH2 (step S312 : YES), control unit ECU acquires the temperature of power conversion device 50 detected by fourth temperature sensor 50 a (step S314 ).

[0111] Next, control unit ECU determines whether the temperature acquired in step S314 is equal to or greater than fourth threshold value TH4 (step S315). Fourth threshold value TH4 is, for example, the same value as third threshold value TH3 used for comparison with the temperature of motor 20, and can be set to 80°C as an example. However, since the temperature of power conversion device 50 is typically lower than that of motor 20, fourth threshold value TH4 may be set to a value lower than third threshold value TH3.

[0112] In step S315, if the acquired temperature is not equal to or higher than fourth threshold value TH4 (step S315: No), control unit ECU sets the requested speed of second pump 621 to Mid (step S316), and the process proceeds to step S318. If the acquired temperature is equal to or higher than fourth threshold value TH4 (step S315: Yes), control unit ECU sets the requested speed of second pump 621 to Hi (step S317), and the process proceeds to step S318.

[0113] In step S318, control unit ECU derives the maximum of the requested speed for second pump 621 set in any one of steps S306, S309, and S310 and the requested speed for second pump 621 set in any one of steps S313, S316, and S317 as the speed set for second pump 621 (step S318). However, if valve device 626 is closed in step S304, control unit ECU derives the requested speed for second pump 621 set in any one of steps S313, S316, and S317 as the speed set for second pump 621.

[0114] Next, control unit ECU controls second pump 621 so that it operates at the rotational speed derived in step S318 (step S319), completing the series of steps. Specifically, control unit ECU generates a drive signal with a duty cycle adjusted so that second pump 621 operates at the rotational speed derived in step S318, and inputs the generated drive signal to second pump 621.

[0115] The control unit ECU can also execute repeatedly Figure 3 In this case, control unit ECU omits step S301 in the second and subsequent processing. Furthermore, in this case, if control unit ECU determines in step S303 that the temperature of first temperature control medium TCM1 is equal to or higher than threshold value TH0 and valve device 626 is closed, it controls valve device 626 to open (e.g., fully open).

[0116] In this manner, the control unit ECU controls the rotational speed of the second pump 621 based on the first temperature detected by the first temperature sensor 61a, which detects the temperature of the first temperature control medium TCM1, and the second temperature detected by the second temperature sensor 62a, which detects the temperature of the second temperature control medium TCM2. This reduces the power consumption of the second pump 621 and allows cooling when the temperature of the first temperature control medium TCM1 or the second temperature control medium TCM2 is high.

[0117] Specifically, compared to a case where the first temperature is less than the first threshold value TH1 and the second temperature is less than the second threshold value TH2, when the first temperature is greater than or equal to the first threshold value TH1 or the second temperature is greater than or equal to the second threshold value TH2 (including a case where the first temperature is greater than or equal to the first threshold value TH1 and the second temperature is greater than or equal to the second threshold value TH2), the control unit ECU controls the rotational speed of the second pump 621 to a higher level (Mid or Hi). This allows cooling when the temperature of at least one of the first temperature control medium TCM1 and the second temperature control medium TCM2 is high.

[0118] In addition, the control unit ECU can also control the speed of the second pump 621 based on the third temperature detected by the third temperature sensor 20a for detecting the temperature of the motor 20 and the fourth temperature detected by the fourth temperature sensor 50a for detecting the temperature of the power conversion device 50, in addition to the first temperature and the second temperature.

[0119] Thus, for example, even if the first temperature of the first temperature control medium TCM1 is equal to or higher than the first threshold value TH1, as long as the third temperature of the electric motor 20, which is the target of cooling by the first temperature control medium TCM1, is less than the third threshold value TH3, the requested rotational speed of the second pump 621 can be set to Mid, which is lower than Hi, thereby suppressing the power consumption of the second pump 621. Furthermore, even if the second temperature of the second temperature control medium TCM2 is equal to or higher than the second threshold value TH2, as long as the fourth temperature of the power conversion device 50, which is the target of cooling by the second temperature control medium TCM2, is less than the fourth threshold value TH4, the requested rotational speed of the second pump 621 can be set to Mid, which is lower than Hi, thereby suppressing the power consumption of the second pump 621.

[0120] like Figure 4 As shown, a fan 401 is provided behind the radiator 622 at the front of the vehicle V. The fan 401 introduces outside air into the radiator 622 by blowing air from the front (Fr) toward the rear (Rr) of the vehicle V.

[0121] The air conditioner condenser 402 is a condenser of the air conditioner of the vehicle V and is located, for example, in front of the fan 401 and above the radiator 622. The first radiator 403 is a radiator for cooling the internal combustion engine ICE and is located, for example, in front of the fan 401 and behind the radiator 622.

[0122] Reference Figure 5 The control of valve device 626 based on vehicle speed will be described. First, control unit ECU obtains the vehicle speed of vehicle V detected by a vehicle speed sensor installed in vehicle V (step S501). Next, control unit ECU determines whether the vehicle speed obtained in step S501 is below threshold value TH5 (step S502). As an example, threshold value TH5 can be set to 10 [km / h].

[0123] If the acquired vehicle speed is below threshold value TH5 in step S502 (step S502: YES), control unit ECU closes valve device 626 (step S503) and returns to step S501. In this case, heat exchange between first temperature control medium TCM1 and second temperature control medium TCM2 in heat exchanger 63 is not performed. Therefore, heat from motor 20 and generator 30 is prevented from being transferred to radiator 622.

[0124] If the acquired vehicle speed is not less than or equal to threshold value TH5 in step S502 (step S502: No), control unit ECU opens valve device 626 (step S504) and returns to step S501. In this state, heat exchange between first temperature control medium TCM1 and second temperature control medium TCM2 in heat exchanger 63 is in progress. Consequently, heat from motor 20 and generator 30 is transferred to radiator 622, cooling motor 20 and generator 30.

[0125] In this way, when the vehicle V is parked or traveling at a low speed, the control unit ECU suppresses the heat exchange between the first temperature adjustment medium TCM1 and the second temperature adjustment medium TCM2 to prevent the heat of the motor 20 and the generator 30 (rotating motor) from being transferred to the radiator 622 (first radiator). This prevents the temperature of the external air from rising due to the heat exchange between the radiator 622 and the external air, and does not hinder the heat exchange in other heat exchangers such as the air-conditioning condenser 402 and the first radiator 403 (second radiator).

[0126] By placing the power converter 50 in the first branch flow path 620b1, the power converter 50 and the heat exchanger 63 are arranged in parallel. This reduces the resistance of the second temperature control circuit 62 when the valve device 626 is opened to cool the electric motor 20, and allows the use of a low-output second pump 621.

[0127] While one embodiment of the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to this embodiment. It is apparent that those skilled in the art will be able to devise various variations or modifications within the scope of the technical solution, and such variations and modifications also fall within the scope of the present invention. Furthermore, the various components of the above-described embodiment may be arbitrarily combined without departing from the spirit of the invention.

[0128] For example, the vehicle V has been described as including an internal combustion engine ICE. However, the vehicle V may be an electric vehicle that does not include an internal combustion engine ICE.

[0129] Furthermore, although the third temperature sensor 20a is provided in the motor 20 and measures the temperature of the motor 20 by the third temperature sensor 20a, the third temperature sensor 20a may be provided in the generator 30 and measures the temperature of the generator 30 by the third temperature sensor 20a.

[0130] Furthermore, although the power converter 50 and the heat exchanger 63 are arranged in parallel, they may be arranged in series. For example, the power converter 50 may be arranged between the radiator 622 and the branch portion 624 .

[0131] In this specification, at least the following matters are described: In addition, although corresponding components and the like in the above-mentioned embodiment are shown in parentheses as an example, the present invention is not limited thereto.

[0132] (1) A vehicle temperature control system (vehicle temperature control system 10), wherein the vehicle temperature control system comprises:

[0133] a first temperature adjustment circuit (first temperature adjustment circuit 61 ), which adjusts the temperature of the rotating electrical machine (motor 20 , generator 30 ) and is provided with a first pump (first pump 611 );

[0134] a second temperature adjustment circuit (second temperature adjustment circuit 62 ) that adjusts the temperature of the power conversion device (power conversion device 50 ) and includes a second pump (second pump 621 ); and

[0135] a heat exchanger (heat exchanger 63) that performs heat exchange between the first temperature adjustment medium (first temperature adjustment medium TCM1) circulating in the first temperature adjustment circuit and the second temperature adjustment medium (second temperature adjustment medium TCM2) circulating in the second temperature adjustment circuit,

[0136] The second temperature adjustment circuit comprises:

[0137] a first radiator (first radiator 403 ) for performing heat exchange between the second temperature adjustment medium and external air;

[0138] a first branch flow path (first branch flow path 620b1) for the second temperature adjustment medium that bypasses the heat exchanger;

[0139] A second branch flow path (second branch flow path 620b2) of the second temperature adjustment medium passing through the heat exchanger; and

[0140] A flow rate regulating valve (valve device 626 ) regulates the flow rate of the second temperature regulating medium to the second branch flow path.

[0141] According to (1), the second temperature adjustment circuit for adjusting the temperature of the power conversion device comprises: a first branch flow path for the second temperature adjustment medium that bypasses the heat exchanger; a second branch flow path for the second temperature adjustment medium that passes through the heat exchanger; and a flow adjustment valve that adjusts the flow of the second temperature adjustment medium to the second branch flow path, thereby limiting the flow of the second temperature adjustment medium into the heat exchanger, thereby suppressing the temperature drop of the first temperature adjustment medium caused by heat exchange between the first temperature adjustment medium and the second temperature adjustment medium used for temperature adjustment of a rotating electrical machine such as an electric motor, and suppressing friction loss caused by the first temperature adjustment medium.

[0142] (2) The vehicle temperature control system according to (1), wherein:

[0143] The first temperature adjustment circuit includes a first temperature sensor (first temperature sensor) for detecting the temperature of the first temperature adjustment medium.

[0144] The vehicle temperature adjustment system includes a control unit (control unit ECU) that controls the flow adjustment valve when the temperature detected by the first temperature sensor is below a specified value (TH0) so that the flow rate of the second temperature adjustment medium to the second branch flow path is reduced compared to a case where the temperature detected by the first temperature sensor exceeds the specified value.

[0145] According to (2), by limiting the flow of the second temperature control medium into the heat exchanger when the temperature of the first temperature control medium is below a predetermined value, heat exchange between the first temperature control medium and the second temperature control medium can be suppressed, thereby suppressing a decrease in the temperature of the first temperature control medium.

[0146] (3) The vehicle temperature control system according to (1) or (2), wherein:

[0147] The first temperature adjustment circuit includes a third temperature sensor (third temperature sensor 20a) for detecting the temperature of the rotating electrical machine.

[0148] The vehicle temperature adjustment system includes a control device that controls the flow adjustment valve so that the flow rate of the second temperature adjustment medium into the second branch flow path is reduced when the temperature detected by the third temperature sensor is below a predetermined value, compared to when the temperature detected by the third temperature sensor exceeds the predetermined value.

[0149] According to (3), by limiting the flow of the second temperature control medium into the heat exchanger when the temperature of the rotating electrical machine is below a predetermined value, it is possible to suppress heat exchange between the first temperature control medium and the second temperature control medium in a state where there is little demand for cooling of the rotating electrical machine, thereby suppressing a decrease in the temperature of the first temperature control medium.

[0150] (4) The vehicle temperature control system according to (2) or (3), wherein:

[0151] The rotating electrical machine includes an electric motor (electric motor 20),

[0152] The control device decreases the predetermined value in response to an increase in the required output of the electric motor.

[0153] According to (4), the reference temperature for limiting the flow of the second temperature control medium into the heat exchanger is reduced in accordance with an increase in the required output of the motor, thereby starting heat exchange between the first temperature control medium and the second temperature control medium to cool the first temperature control medium before the temperature of the motor actually rises, thereby suppressing the temperature rise of the motor.

[0154] (5) The vehicle temperature control system according to any one of (2) to (4), wherein:

[0155] The vehicle temperature adjustment system is mounted on an electric vehicle (vehicle V) that travels using the rotating electric machine.

[0156] The control device adjusts the prescribed value based on a driving mode of the electric vehicle.

[0157] According to (5), the reference temperature for limiting the flow of the second temperature control medium into the heat exchanger is changed based on the driving mode of the electric vehicle, thereby controlling the flow control valve to change the timing for cooling the first temperature control medium TCM1, thereby appropriately adjusting the temperature of the rotating electrical machine.

[0158] (6) The vehicle temperature control system according to any one of (1) to (5), wherein:

[0159] The second pump is an electric pump,

[0160] The first temperature adjustment circuit includes a first temperature sensor (first temperature sensor 61a) for detecting the temperature of the first temperature adjustment medium.

[0161] The second temperature adjustment circuit includes a second temperature sensor (second temperature sensor 62a) for detecting the temperature of the second temperature adjustment medium.

[0162] The vehicle temperature adjustment system includes a control device that controls the rotation speed of the electric pump based on a first temperature detected by the first temperature sensor and a second temperature detected by the second temperature sensor.

[0163] According to (6), by controlling the rotation speed of the electric pump based on the respective temperatures of the first temperature control medium and the second temperature control medium, it is possible to suppress the power consumption of the electric pump and cool the first temperature control medium or the second temperature control medium when the temperature is high.

[0164] (7) The vehicle temperature control system according to (6), wherein:

[0165] Compared with the case where the first temperature is lower than the first threshold (first threshold TH1) and the second temperature is lower than the second threshold (second threshold TH2), when the first temperature is higher than the first threshold or the second temperature is higher than the second threshold, the control device controls the rotation speed of the electric pump to increase.

[0166] According to (7), cooling can be performed when the temperature of at least one of the first temperature control medium and the second temperature control medium is high.

[0167] (8) The vehicle temperature control system according to (6) or (7), wherein:

[0168] The first temperature adjustment circuit includes a third temperature sensor (third temperature sensor) for detecting the temperature of the rotating electrical machine.

[0169] The control device controls the rotation speed of the electric pump based on the first temperature, the second temperature, and a third temperature detected by the third temperature sensor.

[0170] According to (8), even if the temperature of the first temperature control medium is high, if the temperature of the rotating electrical machine to be cooled by the first temperature control medium is not high, the rotation speed of the electric pump can be set relatively low, thereby suppressing the power consumption of the electric pump.

[0171] (9) The vehicle temperature control system according to any one of (6) to (8), wherein:

[0172] The second temperature adjustment circuit includes a fourth temperature sensor (fourth temperature sensor 50a) for detecting the temperature of the power conversion device.

[0173] The control device controls the rotation speed of the electric pump based on the first temperature, the second temperature, and a fourth temperature detected by the fourth temperature sensor.

[0174] According to (9), even if the temperature of the second temperature control medium is high, if the temperature of the power conversion device to be cooled by the second temperature control medium is not high, the rotation speed of the electric pump can be set relatively low, thereby suppressing the power consumption of the electric pump.

[0175] (10) The vehicle temperature control system according to any one of (1) to (9), wherein:

[0176] The vehicle temperature adjustment system is mounted on an electric vehicle that runs using the rotating electric machine.

[0177] The vehicle temperature control system includes a control device that controls the flow control valve to reduce the flow rate of the second temperature control medium into the second branch flow path when the vehicle speed of the electric vehicle is below a predetermined value compared to when the vehicle speed exceeds the predetermined value.

[0178] According to (10), when the electric vehicle is parked or traveling at a low speed, the heat exchange between the first temperature adjustment medium and the second temperature adjustment medium is suppressed to prevent the heat of the rotating motor from being transferred to the first radiator. This prevents the temperature rise of the outside air caused by the temperature exchange between the first radiator and the outside air, and does not hinder the heat exchange in other heat exchangers such as the air conditioner condenser and the second radiator.

[0179] (11) The vehicle temperature control system according to any one of (1) to (10), wherein:

[0180] The power conversion device is disposed in the first branch flow path.

[0181] According to (11), by connecting the power conversion device and the heat exchanger in parallel, the resistance of the second temperature control circuit when the flow control valve is opened to cool the electric motor can be reduced, and a low-output pump can be used as the second pump.

Claims

1. A temperature control system for a vehicle, wherein: The vehicle temperature adjustment system includes: a first temperature adjustment circuit, which adjusts the temperature of the rotating electrical machine and is provided with a first pump; a second temperature adjustment circuit that adjusts the temperature of the power conversion device and is provided with a second pump; and a heat exchanger for performing heat exchange between a first temperature adjustment medium circulating in the first temperature adjustment circuit and a second temperature adjustment medium circulating in the second temperature adjustment circuit, The second temperature adjustment circuit comprises: a first radiator for performing heat exchange between the second temperature adjustment medium and external air; a first branch flow path of the second temperature adjustment medium bypassing the heat exchanger; a second branch flow path of the second temperature-control medium that transfers heat to the first temperature-control medium through the heat exchanger; and A flow regulating valve is configured to regulate a flow rate of the second temperature regulating medium to the second branch flow path.

2. The vehicle temperature control system according to claim 1, wherein: The first temperature adjustment circuit includes a first temperature sensor that detects the temperature of the first temperature adjustment medium. The vehicle temperature adjustment system includes a control device that controls the flow adjustment valve so that the flow rate of the second temperature adjustment medium into the second branch flow path is reduced when the temperature detected by the first temperature sensor is below a predetermined value, compared to when the temperature detected by the first temperature sensor exceeds the predetermined value.

3. The vehicle temperature control system according to claim 1 or 2, wherein: The first temperature adjustment circuit includes a third temperature sensor for detecting the temperature of the rotating electrical machine. The vehicle temperature adjustment system includes a control device that controls the flow adjustment valve so that the flow rate of the second temperature adjustment medium into the second branch flow path is reduced when the temperature detected by the third temperature sensor is below a predetermined value, compared to when the temperature detected by the third temperature sensor exceeds the predetermined value.

4. The vehicle temperature control system according to claim 2, wherein: The rotating electrical machine includes an electric motor, The control device decreases the predetermined value in response to an increase in the required output of the electric motor.

5. The vehicle temperature control system according to claim 2, wherein: The vehicle temperature adjustment system is mounted on an electric vehicle that runs using the rotating electric machine. The control device adjusts the prescribed value based on a driving mode of the electric vehicle.

6. The vehicle temperature control system according to claim 1 or 2, wherein: The second pump is an electric pump, The first temperature adjustment circuit includes a first temperature sensor that detects the temperature of the first temperature adjustment medium. The second temperature adjustment circuit includes a second temperature sensor that detects the temperature of the second temperature adjustment medium. The vehicle temperature adjustment system includes a control device that controls the rotation speed of the electric pump based on a first temperature detected by the first temperature sensor and a second temperature detected by the second temperature sensor.

7. The vehicle temperature control system according to claim 6, wherein: The control device controls to increase the rotation speed of the electric pump when the first temperature is equal to or greater than a first threshold or the second temperature is equal to or greater than a second threshold, compared to when the first temperature is lower than a first threshold and the second temperature is lower than a second threshold.

8. The vehicle temperature control system according to claim 6, wherein: The first temperature adjustment circuit includes a third temperature sensor for detecting the temperature of the rotating electrical machine. The control device controls the rotation speed of the electric pump based on the first temperature, the second temperature, and a third temperature detected by the third temperature sensor.

9. The vehicle temperature control system according to claim 6, wherein: The second temperature adjustment circuit includes a fourth temperature sensor for detecting the temperature of the power conversion device. The control device controls the rotation speed of the electric pump based on the first temperature, the second temperature, and a fourth temperature detected by the fourth temperature sensor.

10. The vehicle temperature control system according to claim 1 or 2, wherein: The vehicle temperature adjustment system is mounted on an electric vehicle that runs using the rotating electric machine. The vehicle temperature control system includes a control device that controls the flow control valve to reduce the flow rate of the second temperature control medium into the second branch flow path when the vehicle speed of the electric vehicle is below a predetermined value compared to when the vehicle speed exceeds the predetermined value.

11. The vehicle temperature control system according to claim 1 or 2, wherein: The power conversion device is disposed in the first branch flow path.

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