Patent Publication Number: US-2022219541-A1

Title: Vehicle temperature adjustment system

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based on and claims priority under 35 USC 119 from Japanese Patent Application No. 2021-003821 filed on Jan. 13, 2021. 
     TECHNICAL FIELD 
     The present disclosure relates to a vehicle temperature adjustment system mounted on an electric vehicle or the like. 
     BACKGROUND ART 
     In related art, there has been known a vehicle including a rotary electric machine and an electric power conversion device, such as an electric vehicle. In general, since the rotary electric machine and the electric power conversion device generate heat during operation, a vehicle temperature adjustment system which adjusts a temperature of the rotary electric machine and the power conversion device is mounted on a vehicle including the rotary electric machine and the power conversion device. 
     For example, JP-A-2001-238406 discloses a vehicle temperature adjustment system including a circulation path L through which oil circulates and which cools an electric motor M, a circulation path F through which cooling water circulates and which cools an inverter U, and a heat exchange unit (oil cooler C) which performs heat exchange between the cooling water flowing through the circulation path F and the oil flowing through the circulation path L. A radiator R is provided in the circulation path F, and the cooling water flowing through the circulation path F is cooled by the radiator R. The oil flowing through the circulation path L is cooled by the heat exchange between the cooling water flowing through the circulation path F and the oil flowing through the circulation path L in the heat exchange unit (oil cooler C). Therefore, in the vehicle temperature adjustment system in JP-A-2001-238406, a radiator for cooling the oil is not necessary, and the cooling water flowing through the circulation path F and the oil flowing through the circulation path L can be cooled by one radiator, thereby miniaturizing the vehicle temperature adjustment system. 
     In a configuration in which a temperature adjustment medium for performing temperature adjustment of a rotary electric machine such as an electric motor is cooled by heat exchange with a temperature adjustment medium for performing temperature adjustment of an electric power conversion device, when an abnormality such as a failure in a heat exchanger occurs, the temperature of the rotary electric machine is increased, which may lead to a failure of the rotary electric machine. However, in the configuration in JP-A-2001-238406, it is not possible to detect an abnormality in the heat exchange unit. 
     SUMMARY 
     The present disclosure provides a vehicle temperature adjustment system capable of detecting an abnormality in a heat exchanger which performs heat exchange between different temperature adjustment media. 
     According to an aspect of the present disclosure, there is provided a vehicle temperature adjustment system, including: 
     a first temperature adjustment circuit which includes a first pump and through which a first temperature adjustment medium circulates; 
     a second temperature adjustment circuit which includes a second pump and through which a second temperature adjustment medium circulates; 
     a heat exchanger configured to perform heat exchange between the first temperature adjustment medium and the second temperature adjustment medium; 
     a first temperature sensor configured to detect a temperature of the first temperature adjustment medium flowing into the heat exchanger; 
     a second temperature sensor configured to detect a temperature of the first temperature adjustment medium flowing out of the heat exchanger; 
     a third temperature sensor configured to detect a temperature of the second temperature adjustment medium flowing into the heat exchanger; and a detection unit configured to detect an abnormality in the heat exchanger based on each detection value of the first temperature sensor, the second temperature sensor, and the third temperature sensor. 
     According to the present disclosure, it is possible to detect an abnormality in a heat exchanger which performs heat exchange between different temperature adjustment media. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a block diagram illustrating a vehicle temperature adjustment system according to an embodiment of the present disclosure. 
         FIG. 2  is a flowchart illustrating an example of control performed by an abnormality detection unit. 
         FIG. 3  is a flowchart illustrating another example of control performed by the abnormality detection unit. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, an embodiment of a vehicle on which a vehicle temperature adjustment system according to the present disclosure is mounted will be described with reference to the accompanying drawings. It should be noted that the drawings are viewed in a direction of reference numerals. In the present specification and the like, in order to simplify and clarify the description, a front-rear direction, a left-right direction, and an upper-lower direction are respectively described in accordance with directions viewed from a driver of a vehicle. In the drawings, a front side of the vehicle is denoted by Fr, a rear side thereof is denoted by Rr, a left side thereof is denoted by L, a right side thereof is denoted by R, an upper side thereof is denoted by U. and a lower side thereof is denoted by D. 
     Embodiment 
     First, a vehicle temperature adjustment system  10  according to an embodiment of the present disclosure will be described with reference to  FIG. 1 . 
     As illustrated in  FIG. 1 , the vehicle temperature adjustment system  10  according to the present embodiment is mounted on a vehicle V, and includes an internal combustion engine ICE, a control device ECU, an electric motor  20 , a power generator  30 , a transmission device  40 , an electric power conversion device  50 , and a temperature adjustment circuit  60 . 
     The electric motor  20  is a rotary electric machine which outputs power for driving the vehicle V using electric power stored in an electric storage device (not illustrated) mounted on the vehicle V or electric power generated by the power generator  30 . When the vehicle V is braked, the electric motor  20  may generate electric power by kinetic energy of drive wheels of the vehicle V to charge the electric storage device described above. 
     The power generator  30  is a rotary electric machine which generates electric power by the power of the internal combustion engine ICE, charges the electric storage device described above, or supplies electric power to the electric motor  20 . 
     The transmission device  40  is a device, such as a gear-type power transmission device, reducing a speed of the power output from the electric motor  20  and transmitting the speed-reduced power to the drive wheels. 
     The electric power conversion device  50  includes a power drive unit (PDU) (not illustrated) which converts the electric power output from the electric storage device from a direct current to an alternating current to control input and output power of the electric motor  20  and the power generator  30 , and a voltage control unit (VCU) (not illustrated) which boosts the electric power output from the electric storage device as necessary. The VCU may step down the electric power generated by the electric motor  20  when the electric motor  20  generates the electric power in a case where the vehicle V is braked. 
     The temperature adjustment circuit  60  includes: a first temperature adjustment circuit  61  through which a non-conductive first temperature adjustment medium TCM 1  circulates and which adjusts temperature of the electric motor  20 , the power generator  30 , and the transmission device  40 ; a second temperature adjustment circuit  62  through which a conductive second temperature adjustment medium TCM 2  circulates and which adjusts a temperature of the electric power conversion device  50 ; and a heat exchanger  63  which performs heat exchange between the first temperature adjustment medium TCM 1  and the second temperature adjustment medium TCM 2 . The non-conductive first temperature adjustment medium TCM 1  is, for example, oil which is called automatic transmission fluid (ATF), can lubricate the electric motor  20 , the power generator  30 , and the transmission device  40 , and can adjust the temperature thereof. The conductive second temperature adjustment medium TCM 2  is, for example, cooling water which is called long life coolant (LLC). 
     The first temperature adjustment circuit  61  is provided with a first pump  611  and a storage unit  612 . The first pump  611  is a mechanical pump driven by the power of the internal combustion engine ICE and the rotational force of an axle (not illustrated) of the vehicle V. The storage unit  612  stores the first temperature adjustment medium TCM 1  circulating through the first temperature adjustment circuit  61 . The storage unit  612  is, for example, an oil pan provided at a bottom of a housing (not illustrated) in which the electric motor  20 , the power generator  30 , and the transmission device  40  are housed. The first temperature adjustment circuit  61  includes a branching portion  613 . The first temperature adjustment circuit  61  includes: a pressure feed flow path  610   a  in which the first pump  611  is provided, of which an upstream end portion is connected to the storage unit  612 , and of which a downstream end portion is connected to the branching portion  613  through the first pump  611 ; a first branch flow path  610   b   1  in which the electric motor  20  and the power generator  30  are provided, of which an upstream end portion is connected to the branching portion  613 , and of which a downstream end portion is connected to the storage unit  612  through the electric motor  20  and the power generator  30 ; and a second branch flow path  610   b   2  in which the transmission device  40  is provided, of which an upstream end portion is connected to the branching portion  613 , and of which a downstream end portion is connected to the storage unit  612  through the transmission device  40 . In the first temperature adjustment circuit  61 , the heat exchanger  63  is disposed upstream of the electric motor  20  and the power generator  30  in the first branch flow path  610   b   1 . 
     Therefore, in the first temperature adjustment circuit  61 , a flow path in which the first temperature adjustment medium TCM 1  pressure-fed from the first pump  611  is cooled by the heat exchange with the second temperature adjustment medium TCM 2  in the heat exchanger  63  through the first branch flow path  610   b   1  from the branching portion  613 , is supplied to the electric motor  20  and the power generator  30  to lubricate the electric motor  20  and the power generator  30  and adjust the temperature thereof, and then is stored in the storage unit  612 , and a flow path in which the first temperature adjustment medium TCM 1  pressure-fed from the first pump  611  is supplied to the transmission device  40  through the second branch flow path  610   b   2  from the branching portion  613  to lubricate the transmission device  40  and adjust the temperature thereof, and then is stored in the storage unit  612  are formed in parallel. The first temperature adjustment medium TCM 1  stored in the storage unit  612  flows through the pressure feed flow path  610   a  and is supplied to the first pump  611 , and the first temperature adjustment medium TCM 1  circulates through the first temperature adjustment circuit  61 . 
     In the present embodiment, the first branch flow path  610   b   1  and the second branch flow path  610   b   2  are formed such that a flow rate of the first temperature adjustment medium TCM 1  flowing through the first branch flow path  610   b   1  is larger than a flow rate of the first temperature adjustment medium TCM 1  flowing through the second branch flow path  610   b   2 . 
     The first temperature adjustment circuit  61  is provided with a first temperature sensor  61   a  which detects a temperature of the first temperature adjustment medium TCM 1  circulating through the first temperature adjustment circuit  61 . In the present embodiment, the first temperature sensor  61   a  is provided in the storage unit  612 , which is an oil pan, and detects the temperature of the first temperature adjustment medium TCM 1  stored in the storage unit  612 . The first temperature sensor  61   a  outputs a detection value of the temperature of the first temperature adjustment medium TCM 1  stored in the storage unit  612  to the control device ECU. The first temperature sensor  61   a  is an example of a first temperature sensor which detects the temperature Toil_in of the first temperature adjustment medium TCM 1  flowing into the heat exchanger  63 . 
     The first temperature adjustment circuit  61  further includes a pressure adjustment circuit  610   c  of which an upstream end portion is connected to the storage unit  612 , and of which a downstream end portion is connected to the pressure feeding flow path  610   a  on a downstream side of the first pump  611 . The pressure adjustment circuit  610   c  is provided with a pressure adjustment valve  619 . The pressure adjustment valve  619  may be a check valve or an electromagnetic valve such as a solenoid valve. When the liquid pressure of the first temperature adjustment medium TCM 1  pressure-fed from the first pump  611  is equal to or higher than a predetermined upper limit pressure, the pressure adjustment valve  619  is opened, and a part of the first temperature adjustment medium TCM 1  pressure-fed from the first pump  611  is returned to the storage unit  612 . Accordingly, the liquid pressure of the first temperature adjustment medium TCM 1  flowing through the first branch flow path  610   b   1  and the second branch flow path  610   b   2  is held to be equal to or lower than the upper limit pressure. 
     A second temperature sensor  610   c  is provided between the heat exchanger  63  and the electric motor  20  and between the heat exchanger  63  and the power generator  30  in the flow path of the first temperature adjustment medium TCM 1  in the first temperature adjustment circuit  61 . The second temperature sensor  610   c  is an example of a second temperature sensor which detects the temperature Toil_out of the first temperature adjustment medium TCM 1  flowing out of the heat exchanger  63 . The second temperature sensor  610   c  outputs a detection value of the temperature of the first temperature adjustment medium TCM 1  flowing out of the heat exchanger  63  to the control device ECU. 
     The second temperature adjustment 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 which is driven by the electric power stored in the electric storage device. The radiator  622  is disposed at a front portion of the vehicle V. and is a heat dissipation device which cools the second temperature adjustment medium TCM 2  by traveling wind when the vehicle V is traveling. The storage tank  623  is a tank in which the second temperature adjustment medium TCM 2  circulating through the second temperature adjustment circuit  62  is temporarily stored. Even when cavitation occurs in the second temperature adjustment medium TCM 2  circulating through the second temperature adjustment circuit  62 , the cavitation occurred in the second temperature adjustment medium TCM 2  disappears because the second temperature adjustment medium TCM 2  circulating through the second temperature adjustment circuit  62  is temporarily stored in the storage tank  623 . 
     The second temperature adjustment circuit  62  includes a branching portion  624  and a merging portion  625 . The second temperature adjustment circuit  62  includes a pressure feed flow path  620   a  in which the storage tank  623 , the second pump  621 , and the radiator  622  are provided in this order from an upstream side, of which an upstream end portion is connected to the merging portion  625 , and of which an downstream end portion is connected to the branching portion  624  through the storage tank  623 , the second pump  621 , and the radiator  622 . The second temperature adjustment medium TCM 2  stored in the storage tank  623  is pressure-fed by the second pump  621  through the pressure feed flow path  620   a , and is cooled by the radiator  622 . 
     The second temperature adjustment circuit  62  further includes: a first branch flow path  620   b   1  in which the electric power conversion device  50  is provided, of which an upstream end portion is connected to the branching portion  624 , and of which a downstream end portion is connected to the merging portion  625  through the electric power conversion device  50 ; and a second branch flow path  620   b   2  in which the heat exchanger  63  is provided, of which an upstream end portion is connected to the branching portion  624 , and of which a downstream end portion is connected to the merging portion  625  through the heat exchanger  63 . In the present embodiment, a valve device  626  is provided as a flow rate adjustment valve in a portion of the second branch flow path  620   b   2  upstream of the heat exchanger  63 . In the present embodiment, the valve device  626  may be an ON-OFF valve which switches the second branch flow path  620   b   2  between a fully open state and a fully closed state, or may be a variable flow rate valve which can adjust a flow rate of the second temperature adjustment medium TCM 2  flowing through the second branch flow path  620   b   2 . The valve device  626  is controlled by the control device ECU. 
     Therefore, the second temperature adjustment medium TCM 2  pressure-fed by the second pump  621  and cooled by the radiator  622  in the pressure-feed flow path  620   a  branches into the first branch flow path  620   b   1  and the second branch flow path  620   b   2  at the branching portion  624 . The second temperature adjustment medium TCM 2  flowing through the first branch flow path  620   b   1  cools the electric power conversion device  50  and merges with the second branch flow path  620   b   2  and the pressure feeding flow path  620   a  at the merging portion  625 . The second temperature adjustment medium TCM 2  flowing through the second branch flow path  620   b   2  cools the first temperature adjustment medium TCM 1  by exchanging heat with the first temperature adjustment medium TCM 1  in the heat exchanger  63 , and merges with the first branch flow path  620   b   1  and the pressure feed flow path  620   a  at the merging portion  625 . The second temperature adjustment medium TCM 2  flowing through the first branch flow path  620   b   1  and the second temperature adjustment medium TCM 2  flowing through the second branch flow path  620   b   2  are merged at the merging portion  625 , flow through the pressure feed flow path  620   a , and are temporarily stored in the storage tank  623 . Then, the second temperature adjustment medium TCM 2  stored in the storage tank  623  is supplied again to the second pump  621  through the pressure feed flow path  620   a , and the second temperature adjustment medium TCM 2  circulates through the second temperature adjustment circuit  62 . 
     In the present embodiment, the first branch flow path  620   b   1  and the second branch flow path  620   b   2  are formed such that the flow rate of the second temperature adjustment medium TCM 2  flowing through the first branch flow path  620   b   1  is larger than the flow rate of the second temperature adjustment medium TCM 2  flowing through the second branch flow path  620   b   2 . 
     A third temperature sensor  620   c  is provided between the radiator  622  and the branching portion  624  in the flow path of the second temperature adjustment medium TCM 2  in the second temperature adjustment circuit  62 . The third temperature sensor  620   c  outputs a detection value of the temperature of the second temperature adjustment medium TCM 2  flowing from the radiator  622  into the branching portion  624  to the control device ECU. The third temperature sensor  620   c  is an example of a third temperature sensor which detects the temperature Tw of the second temperature adjustment medium TCM 2  flowing into the heat exchanger  63 . 
     In the first temperature adjustment circuit  61 , the temperature of the first temperature adjustment medium TCM 1  stored in the storage unit  612  after cooling the electric motor  20 , the power generator  30 , and the transmission device  40  is about 100 [° C.]. Therefore, the first temperature adjustment medium TCM 1  of about 100 [° C.] is supplied to the heat exchanger  63 . 
     Meanwhile, in the second temperature adjustment circuit  62 , a temperature of the second temperature adjustment medium TCM 2  cooled by the radiator  622  is about 40 [° C.]. Since the second temperature adjustment medium TCM 2  supplied to the heat exchanger  63  does not pass through the electric power conversion device  50  which is a device to be temperature-controlled, the second temperature adjustment medium TCM 2  of about 40 [° C.] is supplied to the heat exchanger  63 . 
     The heat exchanger  63  performs heat exchange between the first temperature adjustment medium TCM 1  of about 100 [° C.] and the second temperature adjustment medium TCM 2  of about 40 [° C.] which are supplied to the heat exchanger  63 . Then, the first temperature adjustment medium TCM 1  of about 80 [° C.] is discharged from the heat exchanger  63  to a downstream side of the first branch flow path  610   b   1  of the first temperature adjustment circuit  61 , and the second temperature adjustment medium TCM 2  of about 70 [° C.] is discharged from the heat exchanger  63  to a downstream side of the second branch flow path  620   b   2  of the second temperature adjustment circuit  62 . 
     In this way, since the first temperature adjustment medium TCM 1  is cooled in the heat exchanger  63 , the temperature adjustment circuit  60  can cool the first temperature adjustment medium TCM 1  without providing a radiator for cooling the first temperature adjustment medium TCM 1 . Therefore, since the temperature adjustment circuit  60  can cool the first temperature adjustment medium TCM 1  flowing through the first temperature adjustment circuit  61  and the second temperature adjustment medium TCM 2  flowing through the second temperature adjustment circuit  62  by one radiator  622 , the temperature adjustment circuit  60  can be miniaturized. 
     The control device ECU controls the internal combustion engine ICE, the electric power conversion device  50 , the second pump  621 , and the valve device  626 . A rotational speed sensor  621   a  which detects a rotational speed of the second pump  621  is attached to the second pump  621 . The rotational speed sensor  621   a  outputs a detection value of the rotational speed of the second pump  621  to the control device ECU. 
     In addition, the control device ECU includes an abnormality detection unit  71 . The abnormality detection unit  71  detects an abnormality (for example, a failure) in the heat exchanger  63 . When the abnormality in the heat exchanger  63  is detected by the abnormality detection unit  71 , the control device ECU performs, for example, control for notifying the driver of the abnormality in the heat exchanger  63 , control for preventing the operation of the rotary electric machine such as the electric motor  20  or the power generator  30 , and the like. 
     Further, the abnormality detection unit  71  may detect an abnormality (for example, a failure) in the valve device  626 . When the abnormality in the valve device  626  is detected by the abnormality detection unit  71 , the control device ECU performs, for example, control for notifying the driver of the abnormality in the valve device  626 , control for preventing the operation of the rotary electric machine such as the electric motor  20  or the power generator  30 , and the like. 
     Returning to  FIG. 1 , when the first temperature adjustment medium TCM 1  is ATF, a viscosity of the first temperature adjustment medium TCM 1  is increased as the temperature of the first temperature adjustment medium TCM 1  is decreased. Since the first temperature adjustment medium TCM 1  flows through the electric motor  20  and the power generator  30 , a friction loss generated in the electric motor  20  and the power generator  30  is increased, and output efficiencies of the electric motor  20  and the power generator  30  is decreased when the viscosity is increased. Therefore, when the electric motor  20  and the power generator  30  are not at a high temperature at the time of starting the electric motor  20  and the power generator  30  or the like, and the temperature of the first temperature adjustment medium TCM 1  is equal to or lower than a predetermined temperature, the first temperature adjustment medium TCM 1  does not need to be cooled and it is preferable that the first temperature adjustment medium TCM 1  is not cooled. 
     When the detection value of the temperature of the first temperature adjustment medium TCM 1  output from the first temperature sensor  61   a  is equal to or lower than the predetermined temperature, the control device ECU fully closes the valve device  626  and controls the valve device  626  so as to block the second temperature adjustment medium TCM 2  from flowing through the second branch flow path  620   b   2 . 
     When the second temperature adjustment medium TCM 2  is blocked from flowing through the second branch flow path  620   b   2 , the second temperature adjustment medium TCM 2  is not supplied to the heat exchanger  63 , and therefore, the heat exchange is not performed between the first temperature adjustment medium TCM 1  and the second temperature adjustment medium TCM 2 , and the first temperature adjustment medium TCM 1  is not cooled. Therefore, when the first temperature adjustment medium TCM 1  does not need to be cooled, the first temperature adjustment medium TCM 1  can be prevented from being cooled by the heat exchanger  63 . As a result, it is possible to prevent an increase in friction loss generated in the electric motor  20  and the power generator  30 . 
     An example of abnormality detection by the control device ECU will be described with reference to  FIG. 2 . For example, when an ignition power source of the vehicle V is turned on, the control device ECU executes the process illustrated in  FIG. 2 . The process is executed by, for example, the abnormality detection unit  71 . As an initial state, it is assumed that the valve device  626  is fully opened. 
     First, the control device ECU starts driving the second pump  621  (step S 201 ). Specifically, the control device ECU starts driving the second pump  621  by inputting a drive signal of a predetermined duty ratio to the second pump  621 . The second pump  621  operates at a rotation speed corresponding to the duty ratio of a drive signal input from the control device ECU, thereby pressure-feeding the second temperature adjustment medium TCM 2 . 
     Next, the control device ECU acquires a temperature Toil_in of the first temperature adjustment medium TCM 1  (the first temperature adjustment medium TCM 1  upstream of the heat exchanger  63 ) flowing into the heat exchanger  63 , which is detected by the first temperature sensor  61   a  (step S 202 ). Next, the control device ECU determines whether the temperature Toil_in acquired in step S 202  is equal to or higher than a threshold value TH 0  (step S 203 ). The threshold value TH 0  is, for example, a value corresponding to a temperature sufficiently higher than the temperature of the second temperature adjustment medium TCM 2  cooled by the radiator  622 , and may be, for example, about 80 [° C.]. 
     In step S 203 , when the acquired temperature Toil_in is not equal to or higher than the threshold value TH 0  (step S 203 : No), it can be determined that a temperature difference between the first temperature adjustment medium TCM 1  and the second temperature adjustment medium TCM 2  is small, and it is difficult to accurately detect the abnormality of the heat exchanger  63 . In this case, the control device ECU returns to step S 202 . 
     In step S 203 , when the acquired temperature Toil_in is equal to or higher than the threshold value TH 0  (step S 203 : Yes), it can be determined that there is a certain degree of temperature difference between the first temperature adjustment medium TCM 1  and the second temperature adjustment medium TCM 2 , and an abnormality in the heat exchanger  63  can be accurately detected. In this case, the control device ECU acquires the temperature Tw of the second temperature adjustment medium TCM 2  flowing into the heat exchanger  63 , which is detected by the third temperature sensor  620   c  (step S 204 ). 
     Next, the control device ECU derives an estimated value Q 1  of a heat exchange amount between the first temperature adjustment medium TCM 1  and the second temperature adjustment medium TCM 2  in the heat exchanger  63  based on the temperature Toil_in acquired in step S 202  and the temperature Tw acquired in step S 204  (step S 205 ). For example, map information indicating the estimated value Q 1  for each combination of the temperature Toil_in and the temperature Tw is stored in a memory accessible by the control device ECU, and the control device ECU derives the estimated value Q 1  based on the map information. 
     Next, the control device ECU acquires the temperature Toil_out of the first temperature adjustment medium TCM 1  (the first temperature adjustment medium TCM 1  downstream of the heat exchanger  63 ) flowing out of the heat exchanger  63 , which is detected by the second temperature sensor  610   c  (step S 206 ). Next, the control device ECU determines whether a difference (Toil_in−Toil_out) between the temperature Toil_in acquired in step S 202  and the temperature Toil_out acquired in step S 206  is within a range of 3 [° C.] of the estimated value Q 1  of the heat exchange amount derived in step S 205  (step S 207 ). 
     Here, the estimated value Q 1  of the heat exchange amount is an estimated value of a temperature change of the first temperature adjustment medium TCM 1  in the heat exchanger  63  in a case where it is assumed that there is no abnormality in the heat exchanger  63 . Therefore, in step S 207 , it is possible to determine whether an actual temperature change of the first temperature adjustment medium TCM 1  in the heat exchanger  63  deviates from the estimated value of the temperature change of the first temperature adjustment medium TCM 1  in the case where it is assumed that there is no abnormality in the heat exchanger  63 . 
     In step S 207 , when the actual temperature change (Toil_in−Toil_out) of the first temperature adjustment medium TCM 1  is not within the range of +3 [° C.] of the estimated value Q 1  of the heat exchange amount (step S 207 : No), the control device ECU determines that there is an abnormality in the heat exchanger  63  (step S 208 ), and ends the series of processes. 
     In step S 207 , when the actual temperature change (Toil_in−Toil_out) of the first temperature adjustment medium TCM 1  is within the range of +3 [° C.] of the estimated value Q 1  of the heat exchange amount (step S 207 : Yes), it can be determined that there is no abnormality in the heat exchanger  63 . In this case, the control device ECU performs control to fully close the valve device  626  (step S 209 ). In this case, when there is no abnormality in the valve device  626 , the inflow of the second temperature adjustment medium TCM 2  into the heat exchanger  63  is blocked, and a transition is made to a state where the heat exchange between the first temperature adjustment medium TCM 1  and the second temperature adjustment medium TCM 2  in the heat exchanger  63  is not performed. Here, the control device ECU stands by for a certain period of time so that the heat exchange between the first temperature adjustment medium TCM 1  and the second temperature adjustment medium TCM 2  in the heat exchanger  63  is not performed. 
     Next, the control device ECU acquires the temperature Toil_in of the first temperature adjustment medium TCM 1  flowing into the heat exchanger  63 , which is detected by the first temperature sensor  61   a  (step S 210 ). In addition, the control device ECU acquires the temperature Toil_out of the first temperature adjustment medium TCM 1  flowing out of the heat exchanger  63 , which is detected by the second temperature sensor  610   c  (step S 211 ). 
     Next, the control device ECU determines whether a difference (Toil_in−Toil_out) between the temperature Toil_in acquired in step S 210  and the temperature Toil_out acquired in step S 211  is within a range of ±3° C. (step S 212 ). By step S 212 , it is possible to determine whether there is an actual temperature change of the first temperature adjustment medium TCM 1  in the heat exchanger  63 . 
     In step S 212 , when the actual temperature change (Toil_in−Toil_out) of the first temperature adjustment medium TCM 1  is not within the range of ±3 [° C.] (step S 212 : No), it can be determined that the heat exchange is performed in the heat exchanger  63 , that is, the inflow of the second temperature adjustment medium TCM 2  into the heat exchanger  63  is not blocked, even though the control of fully closing the valve device  626  is performed in step S 209 . In this case, the control device ECU determines that there is abnormality in the valve device  626  (step S 213 ), and ends the series of processes. 
     When the actual temperature change (Toil_in−Toil_out) of the first temperature adjustment medium TCM 1  is within the range of ±3 [° C.] (step S 212 : Yes), as a result of performing the control of fully closing the valve device  626  in step S 209 , it can be determined that the heat exchange is not performed in the heat exchanger  63 , that is, the inflow of the second temperature adjustment medium TCM 2  into the heat exchanger  63  can be blocked. In this case, the control device ECU determines that there is no abnormality in the heat exchanger  63  and the valve device  626  (step S 214 ), and ends the series of processes. 
     As described above, the control device ECU can detect the abnormality in the heat exchanger  63  which performs the heat exchange between the first temperature adjustment medium TCM 1  and the second temperature adjustment medium TCM 2  based on the temperature Toil_in of the first temperature adjustment medium TCM 1  flowing into the heat exchanger  63 , the temperature Toil_out of the first temperature adjustment medium TCM 1  flowing out of the heat exchanger  63 , and the temperature Tw of the second temperature adjustment medium TCM 2  flowing into the heat exchanger  63 . 
     That is, the abnormality in the heat exchanger  63  can be detected based on these temperatures by utilizing the fact that there is a certain relationship among the temperature Toil_in, the temperature Toil_out, and the temperature Tw when there is no abnormality in the heat exchanger  63 . 
     For example, the abnormality in the heat exchanger  63  can be detected by deriving the estimated value Q 1  of the heat exchange amount between the first temperature adjustment medium TCM 1  and the second temperature adjustment medium TCM 2  in the heat exchanger  63  based on the temperature Toil_in and the temperature Toil_out, and comparing the derived estimated value Q 1  of the heat exchange amount with the actual temperature change amount (temperature Toil_out−temperature Toil_in) of the first temperature adjustment medium TCM 1  in the heat exchanger  63 . 
     However, the present invention is not limited to such an abnormality detection method. For example, the control device ECU may detect the abnormality in the heat exchanger  63  by deriving an estimated value of the temperature of the second temperature adjustment medium TCM 2  flowing out of the heat exchanger  63  based on the temperature Toil_in and the temperature Toil_out, and comparing the derived estimated value of the temperature of the second temperature adjustment medium TCM 2  with the actual temperature Toil_out of the second temperature adjustment medium TCM 2  flowing out of the heat exchanger  63 . 
     In addition, in a configuration in which the second temperature adjustment medium TCM 2  is cooled by the radiator  622 , by using each detection value of each temperature sensor in a state where the temperature Toil_in of the first temperature adjustment medium TCM 1  flowing into the heat exchanger  63  is equal to or higher than a predetermined value (threshold value TH 0 ), that is, in a state where there is a certain temperature difference between the first temperature adjustment medium TCM 1  and the second temperature adjustment medium TCM 2 , it is possible to more accurately detect the abnormality in the heat exchanger  63 . 
     In addition, the abnormality in the valve device  626  can be detected by detecting the abnormality in the heat exchanger  63  based on each detection value of each temperature sensor in a state where the valve device  626  is opened, performing control to close the valve device  626  when the abnormality of the heat exchanger  63  is not detected, and comparing the temperature Toil_in of the first temperature adjustment medium TCM 1  flowing into the heat exchanger  63  with the temperature Toil_out of the first temperature adjustment medium TCM 1  flowing out of the heat exchanger  63 . 
     Another example of abnormality detection by the control device ECU will be described with reference to  FIG. 3 . For example, when an ignition power source of the vehicle V is turned on, the control device ECU executes the process illustrated in  FIG. 3 . The process is executed by, for example, the abnormality detection unit  71 . As an initial state, it is assumed that the valve device  626  is fully opened. 
     Steps S 301  to S 303  are the same as steps S 201  to S 203  illustrated in  FIG. 2 . In step S 303 , when the acquired temperature Toil_in is not equal to or higher than the threshold value TH 0  (step S 203 : No), the control device ECU performs control to fully close the valve device  626  (step S 304 ), and returns to step S 302 . As a result, the inflow of the second temperature adjustment medium TCM 2  into the heat exchanger  63  is blocked, the heat exchange between the first temperature adjustment medium TCM 1  and the second temperature adjustment medium TCM 2  in the heat exchanger  63  is not performed, and the temperature of the first temperature adjustment medium TCM 1  flowing into the heat exchanger  63  is easily increased. When the valve device  626  is already fully closed in step S 304 , the control device ECU may not perform control to fully close the valve device  626 . 
     In step S 203 , when the acquired temperature Toil_in is equal to or higher than the threshold value TH 0  (step S 203 : Yes), the control device ECU performs control to fully open the valve device  626  (step S 305 ). As a result, the second temperature adjustment medium TCM 2  flows into the heat exchanger  63 , and a transition is made to a state where the heat exchange is performed between the first temperature adjustment medium TCM 1  and the second temperature adjustment medium TCM 2  in the heat exchanger  63 . Here, the control device ECU stands by for a certain period of time so that the heat exchange is performed between the first temperature adjustment medium TCM 1  and the second temperature adjustment medium TCM 2  in the heat exchanger  63 . When the valve device  626  is already fully opened in step S 305 , the control device ECU may not perform the control of fully closing the valve device  626 . 
     Next, the control device ECU proceeds to step S 306 . Steps S 306  to S 316  are the same as steps S 204  to S 214  illustrated in  FIG. 2 . In step S 304 , the process of controlling the control device ECU to fully close the valve device  626  has been described, but the control device ECU may control to reduce the flow rate of the valve device  626  (for example, control to half-open the valve device  626 ). 
     As described above, when the temperature of the first temperature adjustment medium TCM 1  is less than the predetermined value (threshold value TH 0 ), that is, when the temperature difference between the first temperature adjustment medium TCM 1  and the second temperature adjustment medium TCM 2  is small and it is difficult to accurately detect the abnormality in the heat exchanger  63 , it is possible to limit the inflow of the second temperature adjustment medium TCM 2  into the heat exchanger  63 , prevent the heat exchange between the first temperature adjustment medium TCM 1  and the second temperature adjustment medium TCM 2 , and increase the temperature of the first temperature adjustment medium TCM 1 . Then, after the temperature of the first temperature adjustment medium TCM 1  is equal to or higher than the predetermined value, the limitation of the inflow of the second temperature adjustment medium TCM 2  into the heat exchanger  63  is released to start the heat exchange between the first temperature adjustment medium TCM 1  and the second temperature adjustment medium TCM 2 , and thereafter, by using the respective detection values of the respective temperature sensors, it is possible to more accurately detect the abnormality in the heat exchanger  63 . 
     Although one embodiment of the present invention has been described above with reference to the accompanying drawings, it is needless to say that the present invention is not limited to such an embodiment. It will be apparent to those skilled in the art that various changes and modifications may be conceived within the scope of the claims, and it is also understood that the various changes and modifications belong to the technical scope of the present invention. The components in the embodiments described above may be combined freely within a range not departing from the spirit of the invention. 
     For example, although the configuration in which the vehicle V includes the internal combustion engine ICE has been described, the vehicle V may be an electric vehicle which does not include the internal combustion engine ICE. 
     Although the configuration in which the electric power conversion device  50  and the heat exchanger  63  are arranged in parallel has been described, the power conversion device  50  and the heat exchanger  63  may be arranged in series. For example, the electric power conversion device  50  may be disposed between the radiator  622  and the branching portion  624 . 
     The configuration in which the first temperature sensor  61   a  of the storage unit  612  is used as the first temperature sensor which detects the temperature Toil_in of the first temperature adjustment medium TCM 1  flowing into the heat exchanger  63  has been described, but the first temperature sensor which detects the temperature Toil_in may be a temperature sensor provided between the storage unit  612  and the heat exchanger  63  in the flow path of the first temperature adjustment medium TCM 1 . The first temperature sensor which detects the temperature Toil_in may be a temperature sensor provided at a position between the branching portion  613  and the transmission device  40  in the flow path of the first temperature adjustment medium TCM 1 . 
     Although the configuration in which the third temperature sensor  620   c  is used as the third temperature sensor which detects the temperature Tw of the second temperature adjustment medium TCM 2  flowing into the heat exchanger  63  has been described, the third temperature sensor which detects the temperature Tw may be a temperature sensor provided between the branching portion  624  and the heat exchanger  63  in the flow path of the second temperature adjustment medium TCM 2 . 
     In the present specification, at least the following matters are described. In the parentheses, the corresponding constituent elements and the like in the above-described embodiment are illustrated as an example, and the present invention is not limited thereto. 
     (1) A vehicle temperature adjustment system (vehicle temperature adjustment system  10 ), including: 
     a first temperature adjustment circuit (first temperature adjustment circuit  61 ) which includes a first pump (first pump  611 ) and through which a first temperature adjustment medium (first temperature adjustment medium TCM 1 ) circulates; 
     a second temperature adjustment circuit (second temperature adjustment circuit  62 ) which includes a second pump (second pump  621 ) and through which a second temperature adjustment medium (second temperature adjustment medium TCM 2 ) circulates; 
     a heat exchanger (heat exchanger  63 ) configured to perform heat exchange between the first temperature adjustment medium and the second temperature adjustment medium; 
     a first temperature sensor (first temperature sensor  61   a ) configured to detect a temperature (temperature Toil_in) of the first temperature adjustment medium flowing into the heat exchanger; 
     a second temperature sensor (second temperature sensor  610   c ) configured to detect a temperature (temperature Toil_out) of the first temperature adjustment medium flowing out of the heat exchanger; 
     a third temperature sensor (third temperature sensor  620   c ) configured to detect a temperature (temperature Tw) of the second temperature adjustment medium flowing into the heat exchanger; and 
     a detection unit (abnormality detection unit  71 ) configured to detect an abnormality in the heat exchanger based on each detection value of the first temperature sensor, the second temperature sensor, and the third temperature sensor. 
     According to (1), it is possible to detect an abnormality in the heat exchanger which performs the heat exchange between the first temperature adjustment medium and the second temperature adjustment medium based on the temperature of the first temperature adjustment medium flowing into the heat exchanger, the temperature of the first temperature adjustment medium flowing out of the heat exchanger, and the temperature of the second temperature adjustment medium flowing into the heat exchanger. 
     (2) The vehicle temperature adjustment system according to (1), in which: 
     the detection unit derives an estimated value (estimated value Q 1 ) of a heat exchange amount between the first temperature adjustment medium and the second temperature adjustment medium in the heat exchanger based on each detection value of the first temperature sensor and the third temperature sensor, and 
     the detection unit is configured to detect the abnormality in the heat exchanger based on the estimated value of the heat exchange amount and each detection value of the first temperature sensor and the second temperature sensor. 
     According to (2), the abnormality in the heat exchanger can be detected by comparing the estimated value of the heat exchange amount between the first temperature adjustment medium and the second temperature adjustment medium in the heat exchanger with the actual temperature change amount of the first temperature adjustment medium in the heat exchanger. 
     (3) The vehicle temperature adjustment system according to (1) or (2), in which: 
     the second temperature adjustment circuit includes a radiator (radiator  622 ) configured to perform heat exchange between the second temperature adjustment medium and outside air; and 
     the detection unit is configured to detect the abnormality in the heat exchanger based on the each detection value of the first temperature sensor, the second temperature sensor, and the third temperature sensor in a state where the temperature detected by the first temperature sensor is equal to or higher than a predetermined value (TH 0 ). 
     According to (3), in a configuration in which the second temperature adjustment medium is cooled by the radiator, the abnormality in the heat exchanger can be detected more accurately by using the detection values of the temperature sensors in a state where the temperature of the first temperature adjustment medium flowing into the heat exchanger is equal to or higher than the predetermined value, that is, in a state where there is a certain temperature difference between the first temperature adjustment medium and the second temperature adjustment medium. 
     (4) The vehicle temperature adjustment system according to (3), in which: 
     the second temperature adjustment circuit includes:
         a first branch flow path (first branch flow path  620   b   1 ) of the second temperature adjustment medium bypassing the heat exchanger;   a second branch flow path (second branch flow path  620   b   2 ) of the second temperature adjustment medium passing through the heat exchanger; and   a flow rate adjustment valve (valve device  626 ) configured to adjust a flow rate of the second temperature adjustment medium to the second branch flow path; and       

     the detection unit is configured to control the flow rate adjustment valve such that the flow rate of the second temperature adjustment medium to the second branch flow path is a first flow rate until the temperature detected by the first temperature sensor is equal to or higher than the predetermined value; and 
     the detection unit is configured to control the flow rate adjustment valve such that the flow rate of the second temperature adjustment medium to the second branch flow path is a second flow rate higher than the first flow rate when the temperature detected by the first temperature sensor is equal to or higher than the predetermined value, and then detect the abnormality in the heat exchanger based on the each detection value of the first temperature sensor, the second temperature sensor, and the third temperature sensor. 
     According to (4), when the temperature of the first temperature adjustment medium is less than the predetermined value, that is, when the temperature difference between the first temperature adjustment medium and the second temperature adjustment medium is small and it is difficult to accurately detect the abnormality in the heat exchanger, it is possible to limit the inflow of the second temperature adjustment medium into the heat exchanger, prevent the heat exchange between the first temperature adjustment medium and the second temperature adjustment medium, and increase the temperature of the first temperature adjustment medium. Then, after the temperature of the first temperature adjustment medium is equal to or higher than the predetermined value, the limitation of the inflow of the second temperature adjustment medium into the heat exchanger is released to start the heat exchange between the first temperature adjustment medium and the second temperature adjustment medium, and thereafter, by using the respective detection values of the respective temperature sensors, it is possible to more accurately detect the abnormality in the heat exchanger. 
     (5) The vehicle temperature adjustment system according to any one of (1) to (4), in which: 
     the second temperature adjustment circuit includes.
         a first branch flow path of the second temperature adjustment medium bypassing the heat exchanger;   a second branch flow path of the second temperature adjustment medium passing through the heat exchanger; and   a flow rate adjustment valve configured to adjust a flow rate of the second temperature adjustment medium to the second branch flow path; and       

     the detection unit is configured to detect the abnormality in the heat exchanger based on the each detection value of the first temperature sensor, the second temperature sensor, and the third temperature sensor in a state where the flow rate adjustment valve is open; and 
     the detection unit is configured to perform control to close the flow rate adjustment valve when the abnormality in the heat exchanger is not detected, and then detects the abnormality in the flow rate adjustment valve based on each detection value of the first temperature sensor and the second temperature sensor. 
     According to (5), the abnormality in the flow rate adjustment valve can be detected by performing control to close the flow rate adjustment valve in a state where it is confirmed that there is no abnormality in the heat exchanger, and comparing the temperature of the first temperature adjustment medium flowing into the heat exchanger with the temperature of the first temperature adjustment medium flowing out of the heat exchanger.