Vehicle temperature control system

Abstract

To provide a vehicle temperature control system capable of reducing commingling of a conductive temperature control medium with a non-conductive temperature control medium.SOLUTION: A vehicle temperature control system 10 comprises: a first temperature control circuit 61 where a non-conductive first temperature control medium TCM1 is circulated; a second temperature control circuit 62 where a conductive second temperature control medium TCM2 is circulated; a heat exchanger 63 which performs heat exchange between the first temperature control medium TCM1 and the second temperature control medium TCM2; and a control device ECU. The second temperature control circuit 62 has a first branch flow passage 620b1 and a second branch flow passage 620b2 respectively connected to a branch section 624 and a confluence section 625. The second branch flow passage 620b2 has a valve device 626 between the branch section 624 and the heat exchanger 63. When detecting a failure in the heat exchanger 63, the control device ECU controls the valve device 626 so as to cut off a flow of the second temperature control medium TCM2 in the second branch flow passage 620b2.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Conventionally, vehicles, such as electric vehicles, that include a rotating electric machine and a power conversion device that controls the rotating electric machine are known. In general, the rotating electric machine and the power conversion device generate heat when driven, so that vehicles that include the rotating electric machine and the power conversion device are equipped with a vehicle temperature control system that controls the temperature of the rotating electric machine and the power conversion device.

[0003] For example, Patent Document 1 discloses a temperature control system for a vehicle that includes 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 exchanger (oil cooler C) that exchanges heat 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 heat exchange between the cooling water flowing through the circulation path F and the oil flowing through the circulation path L in the heat exchanger (oil cooler C). The vehicle temperature control system of Patent Document 1 does not require a radiator for cooling oil, so the cooling water flowing through the circulation path F and the oil flowing through the circulation path L can be cooled by one radiator, and the vehicle temperature control system can be made compact. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2001-238406 A Summary of the Invention [Problem to be solved by the invention]

[0005] On the other hand, in the vehicle temperature control system of Patent Document 1, if the heat exchange unit (oil cooler C) malfunctions and becomes damaged, the cooling water flowing through the circulation path F to cool the inverter U may flow into the circulation path L, causing the cooling water to become mixed with the oil cooling the electric motor M.

[0006] In the vehicle temperature control system of Patent Document 1, when cooling water gets mixed into the oil that cools the electric motor M, the oil containing the cooling water is supplied to the electric motor M. However, since water is conductive, when oil containing the cooling water is supplied to the electric motor M, there is a risk of a short circuit occurring in the electric motor M.

[0007] The present invention provides a temperature control system for a vehicle that can reduce the mixing of a conductive temperature control medium into a non-conductive temperature control medium. [Means for solving the problem]

[0008] The present invention relates to a first temperature control circuit in which a non-conductive first temperature control medium circulates and in which a first pump is provided; a second temperature control circuit in which a conductive second temperature control medium circulates and in which a second pump is provided; a heat exchanger that exchanges heat between the first temperature control medium and the second temperature control medium; A vehicle temperature control system comprising: The second temperature control circuit is A branching section and a junction section; a pressure-feeding flow path provided with the second pump, the pressure-feeding flow path having one end connected to the branching portion and the other end connected to the junction portion; a first branch flow path having a temperature-controlled device, one end of the first branch flow path being connected to the branch portion and the other end of the first branch flow path being connected to the junction portion; a second branch flow path having the heat exchanger, one end connected to the branch portion and the other end connected to the junction portion; The above Second Pumpthe second temperature control medium is pumped through the pressure-feeding flow path, and is branched into the first branch flow path and the second branch flow path at the branching portion, the second temperature control medium flowing through the first branch flow path and the second temperature control medium flowing through the second branch flow path are joined at the junction portion, and are supplied to the first pump through the pressure-feeding flow path, and the second temperature control medium circulates through the second temperature control circuit; a valve device that adjusts a flow rate of the second temperature control medium flowing through the second branch flow path is provided between the branch portion and the heat exchanger, The control device includes: When a failure of the heat exchanger is detected, the valve device is controlled to block the second temperature control medium from flowing through the second branch flow path.

[0009] The present invention also provides a method for producing a semiconductor device comprising the steps of: An internal combustion engine; a first temperature control circuit in which a non-conductive first temperature control medium circulates and in which a first pump is provided; a second temperature control circuit in which a conductive second temperature control medium circulates and in which a second pump is provided; a heat exchanger that exchanges heat between the first temperature control medium and the second temperature control medium; A vehicle temperature control system comprising: the first pump is driven by power of the internal combustion engine, When the control device detects a failure of the heat exchanger, the control device controls the internal combustion engine so as to prohibit the internal combustion engine from stopping.

[0010] The present invention also provides a method for producing a semiconductor device comprising the steps of: a first temperature control circuit in which a non-conductive first temperature control medium circulates and in which a first pump is provided; a second temperature control circuit in which a conductive second temperature control medium circulates and in which a second pump is provided; a heat exchanger that exchanges heat between the first temperature control medium and the second temperature control medium; A vehicle temperature control system comprising: the second pump is an electric pump controllable by the control device, The control device controls the second pump so that the rotation speed of the second pump when a failure of the heat exchanger is detected is lower than the rotation speed of the second pump when a failure of the heat exchanger is not detected. Effect of the Invention

[0011] According to the present invention, even if the heat exchanger fails, it is possible to reduce the mixing of the conductive second temperature control medium into the non-conductive first temperature control medium caused by the second temperature control medium flowing into the first temperature control circuit at the heat exchanger. [Brief description of the drawings]

[0012] [Figure 1] 1 is a block diagram of a vehicle temperature control system according to a first embodiment of the present invention. [Diagram 2] 4 is a diagram showing the behavior of the rotation speed of the second pump in the vehicle temperature adjustment system of FIG. 1 when the heat exchanger is not broken and when the heat exchanger is broken. FIG. [Diagram 3] 2 is a diagram showing the vicinity of a junction of the vehicle temperature control system of FIG. 1. [Figure 4] FIG. 4 is a block diagram of a vehicle temperature control system according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, embodiments of a vehicle equipped with a vehicle temperature control system of the present invention will be described with reference to the accompanying drawings. Note that the drawings are to be read in the direction indicated by the reference numerals.

[0014] [First embodiment] First, a vehicle temperature regulation system 10 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG.

[0015] As shown in FIG. 1, the vehicle temperature control system 10 of this embodiment is mounted on a vehicle V and includes an internal combustion engine ICE, a control device ECU, an electric motor 20, a generator 30, a transmission 40, a power conversion device 50, and a temperature control circuit 60.

[0016] The electric motor 20 is a rotating electric machine that outputs power to drive the vehicle V using electric power stored in a power storage device (not shown) mounted on the vehicle V or electric power generated by a generator 30. When braking the vehicle V, the electric motor 20 may generate electric power using kinetic energy of the drive wheels of the vehicle V to charge the aforementioned power storage device.

[0017] The generator 30 is a rotating electric machine that generates electricity using the power of the internal combustion engine ICE to charge the above-mentioned power storage device or supply electric power to the electric motor 20.

[0018] The transmission 40 is a device that reduces the speed of the power output from the electric motor 20 and transmits it to the drive wheels, and is, for example, a gear-type power transmission device.

[0019] The power conversion device 50 includes a PDU (Power Drive Unit) (not shown) that converts the power output from the above-mentioned power storage device from DC to AC to control the input / output power of the electric motor 20 and the generator 30, and a VCU (Voltage Control Unit) (not shown) that boosts the power output from the above-mentioned power storage device as necessary. When the electric motor 20 generates power during braking of the vehicle V, the VCU may step down the power generated by the electric motor 20.

[0020] The temperature control circuit 60 includes a first temperature control circuit 61 through which a non-conductive first temperature control medium TCM1 circulates and controls the temperatures of the electric motor 20, the generator 30, and the transmission 40, a second temperature control circuit 62 through which a conductive second temperature control medium TCM2 circulates and controls the temperature of the power conversion device 50, and a heat exchanger 63 that exchanges heat between the first temperature control medium TCM1 and the second temperature control medium TCM2. The non-conductive first temperature control medium TCM1 is, for example, an oil called ATF (Automatic Transmission Fluid) that can lubricate and control the temperatures of the electric motor 20, the generator 30, and the transmission 40. The conductive second temperature control medium TCM2 is, for example, a cooling water called LLC (Long Life Coolant).

[0021] The first temperature control circuit 61 is provided with a first pump 611 and a storage section 612. The first pump 611 is a mechanical pump driven by the power of the internal combustion engine ICE and the rotational force of an axle (not shown) of the vehicle V. The storage section 612 stores the first temperature control medium TCM1 circulating through the first temperature control circuit 61. The storage section 612 is, for example, an oil pan provided at the bottom of a housing (not shown) that accommodates the electric motor 20, the generator 30, and the transmission 40. The first temperature control circuit 61 has a branch section 613. The first temperature control circuit 61 has a pumping flow path 610a provided with a first pump 611, an upstream end connected to a storage section 612, and a downstream end connected to a branch section 613 through the first pump 611, a first branch flow path 610b1 provided with an electric motor 20 and a generator 30, an upstream end connected to the branch section 613, and a downstream end connected to the storage section 612 through the electric motor 20 and the generator 30, and a second branch flow path 610b2 provided with a transmission 40, an upstream end connected to the branch section 613, and a downstream end connected to the storage section 612 through the transmission 40. In the first temperature control circuit 61, the heat exchanger 63 is disposed upstream of the electric motor 20 and the generator 30 of the first branch flow path 610b1.

[0022] Therefore, in the first temperature control circuit 61, a flow path is formed in parallel, in which the first temperature control medium TCM1 pumped by the first pump 611 passes through the branching portion 613 and the first branch flow path 610b1, is cooled by exchanging heat with the second temperature control medium TCM2 in the heat exchanger 63, is supplied to the electric motor 20 and the generator 30 to lubricate and regulate the temperature of the electric motor 20 and the generator 30, and is then stored in the storage portion 612; and a flow path is formed in parallel, in which the first temperature control medium TCM1 pumped by the first pump 611 passes through the branching portion 613 and the second branch flow path 610b2, is supplied to the transmission 40 to lubricate and regulate the temperature of the transmission 40, and is then stored in the storage portion 612. The first temperature control medium TCM1 stored in the storage portion 612 flows through the pressure supply flow path 610a and is supplied to the first pump 611, and the first temperature control medium TCM1 circulates through the first temperature control circuit 61.

[0023] In this embodiment, the first branch flow path 610b1 and the second branch flow path 610b2 are formed so that the flow rate of the first temperature control medium TCM1 flowing through the first branch flow path 610b1 is greater than the flow rate of the first temperature control medium TCM1 flowing through the second branch flow path 610b2.

[0024] The first temperature control circuit 61 is provided with a first temperature sensor 61a that detects the temperature of the first temperature control medium TCM1 circulating through the first temperature control circuit 61. In this embodiment, the first temperature sensor 61a is provided in a storage unit 612 that is an oil pan, and detects the temperature of the first temperature control medium TCM1 stored in the storage unit 612. The first temperature sensor 61a outputs a detection value of the temperature of the first temperature control medium TCM1 stored in the storage unit 612 to the control device ECU.

[0025] The first temperature control circuit 61 further includes a pressure control circuit 610c whose upstream end is connected to the reservoir 612 and whose downstream end is connected to the pumping flow path 610a downstream of the first pump 611. The pressure control circuit 610c is provided with a pressure control valve 619. The pressure control valve 619 may be a check valve or an electromagnetic valve such as a solenoid valve. When the liquid pressure of the first temperature control medium TCM1 pumped from the first pump 611 reaches a predetermined upper limit pressure or higher, the pressure control valve 619 opens, and a part of the first temperature control medium TCM1 pumped from the first pump 611 is returned to the reservoir 612. As a result, the liquid pressure of the first temperature control medium TCM1 flowing through the first branch flow path 610b1 and the second branch flow path 610b2 is maintained below the upper limit pressure.

[0026] 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 electric power stored in the above-mentioned power storage device. The radiator 622 is disposed at the front of the vehicle V, and is a heat dissipation device that cools the second temperature control medium TCM2 by the running wind when the vehicle V is running. The storage tank 623 is a tank that temporarily stores the second temperature control medium TCM2 circulating through the second temperature control circuit 62. Even if cavitation occurs in the second temperature control medium TCM2 circulating through the second temperature control circuit 62, the second temperature control medium TCM2 circulating through the second temperature control circuit 62 is temporarily stored in the storage tank 623, so that the cavitation occurring in the second temperature control medium TCM2 disappears.

[0027] The second temperature control circuit 62 has a branching section 624 and a junction section 625. The second temperature control circuit 62 has a storage tank 623, a second pump 621, and a radiator 622 provided in this order from the upstream side, and has a pressure-feeding flow path 620a whose upstream end is connected to the junction section 625, passes through the storage tank 623, the second pump 621, and the radiator 622, and whose downstream end is connected to the branching section 624. The second temperature control medium TCM2 stored in the storage tank 623 is pressure-fed by the second pump 621 through the pressure-feeding flow path 620a, and is cooled by the radiator 622.

[0028] The second temperature control circuit 62 further includes a first branch flow path 620b1 in which the power converter 50 is provided, an upstream end of which is connected to the branch section 624, a downstream end of which passes through the power converter 50 and connects to the junction section 625, and a second branch flow path 620b2 in which a heat exchanger 63 is provided, an upstream end of which is connected to the branch section 624, a downstream end of which passes through the heat exchanger 63 and connects to the junction section 625. In this embodiment, a valve device 626 is provided in a portion upstream of the heat exchanger 63 in the second branch flow path 620b2. In this embodiment, the valve device 626 may be an ON-OFF valve that switches the second branch flow path 620b2 between a fully open state and a fully closed state, or may be a variable flow rate 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 device ECU.

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

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

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

[0032] In the first temperature control circuit 61, the temperature of the first temperature control medium TCM1 stored in the storage section 612 after cooling the electric motor 20, the generator 30, and the transmission 40 is about 100° C. Therefore, the first temperature control medium TCM1 at about 100° C. is supplied to the heat exchanger 63.

[0033] On the other hand, in the second temperature control circuit 62, the temperature of the second temperature control medium TCM2 cooled by the radiator 622 is about 40° C. The second temperature control medium TCM2 supplied to the heat exchanger 63 does not pass through the power conversion device 50, which is the temperature-controlled device, and therefore the second temperature control medium TCM2 at about 40° C. is supplied to the heat exchanger 63.

[0034] The heat exchanger 63 exchanges heat between the first temperature control medium TCM1 of about 100° C. and the second temperature control medium TCM2 of about 40° C., both of which are supplied to the heat exchanger 63. Then, from the heat exchanger 63, the first temperature control medium TCM1 of about 80° C. is discharged downstream of the first branch flow path 610b1 of the first temperature control circuit 61, and the second temperature control medium TCM2 of about 70° C. is discharged downstream of the second branch flow path 620b2 of the second temperature control circuit 62.

[0035] In this way, the first temperature control medium TCM1 is cooled by the heat exchanger 63, so the temperature control circuit 60 can cool the first temperature control medium TCM1 without providing a radiator for cooling the first temperature control medium TCM1. Therefore, the temperature control circuit 60 can cool the first temperature control medium TCM1 flowing through the first temperature control circuit 61 and the second temperature control medium TCM2 flowing through the second temperature control circuit 62 with one radiator 622, so the temperature control circuit 60 can be made compact.

[0036] The control device ECU controls the internal combustion engine ICE, the power conversion device 50, the second pump 621, and the valve device 626. The control device ECU has a heat exchanger failure detection unit 71 that detects a failure of the heat exchanger 63. A rotation speed sensor 621a that detects the rotation speed of the second pump 621 is attached to the second pump 621. The rotation speed sensor 621a outputs a detection value of the rotation speed of the second pump 621 to the control device ECU.

[0037] The heat exchanger failure detection unit 71 detects a failure of the heat exchanger 63 based on the detected value of the rotation speed of the second pump 621 output from the rotation speed sensor 621a.

[0038] 2, when the heat exchanger 63 breaks down and the second temperature control medium TCM2 leaks from the second temperature control circuit 62, the second temperature control medium TCM2 stored in the storage tank 623 decreases. When the liquid level of the second temperature control medium TCM2 in the storage tank 623 drops below the upper end of the pumping path 620a, air is mixed into the second temperature control medium TCM2 discharged from the storage tank 623 to the pumping path 620a. When the second temperature control medium TCM2 mixed with air is supplied to the second pump 621, the rotation speed of the second pump 621 fluctuates more widely from the target rotation speed than when the second temperature control medium TCM2 not mixed with air is supplied. Therefore, when the fluctuation range of the detected rotational speed of the second pump 621 output from the rotational speed sensor 621a relative to the target rotational speed is greater than or equal to a predetermined value, it can be estimated that the second temperature control medium TCM2 containing air is being supplied to the second pump 621, causing the heat exchanger 63 to malfunction and causing the second temperature control medium TCM2 to leak from the second temperature control circuit 62.

[0039] This makes it possible to detect a failure in the heat exchanger 63 with a simple configuration, thereby making it possible to reduce the size of the vehicle temperature adjustment system 10.

[0040] 1, the heat exchanger failure detection unit 71 detects a failure of the heat exchanger 63 based on the detection value of the rotation speed of the second pump 621 output from the rotation speed sensor 621a. Specifically, the heat exchanger failure detection unit 71 detects a failure of the heat exchanger 63 by determining that the heat exchanger 63 has failed when the fluctuation range of the detection value of the rotation speed of the second pump 621 output from the rotation speed sensor 621a with respect to the target rotation speed is equal to or greater than a predetermined value.

[0041] When the heat exchanger failure detection unit 71 detects a failure of the heat exchanger 63, the control device ECU controls the valve device 626 to fully close the valve device 626 and block the second temperature control medium TCM2 from flowing through the second branch flow path 620b2.

[0042] When the valve device 626 is fully closed to block the second temperature control medium TCM2 from flowing through the second branch flow path 620b2, the second temperature control medium TCM2 is not supplied to the heat exchanger 63. Therefore, when a failure of the heat exchanger 63 is detected, the second temperature control medium TCM2 is not supplied to the heat exchanger 63. Therefore, even if the heat exchanger 63 fails and is damaged, it is possible to reduce the mixing of the conductive second temperature control medium TCM2 into the non-conductive first temperature control medium TCM1 due to the second temperature control medium TCM2 flowing into the first temperature control circuit 61 at the heat exchanger 63.

[0043] 3, the downstream end of the first branch flow path 620b1, the downstream end of the second branch flow path 620b2, and the upstream end of the pumping flow path 620a join together at the junction 625. The arrows in FIG. 3 indicate the flow direction of the second temperature control medium TCM2.

[0044] At the junction 625, a throttle section 625a where the flow channel cross-sectional area is reduced is formed at the downstream end of the first branch flow channel 620b1. Then, a downstream end of the second branch flow channel 620b2 is connected to the first branch flow channel 620b1 at the throttle section 625a.

[0045] The second temperature control medium TCM2 flowing from the downstream end of the first branch flow path 620b1 to the pumping flow path 620a has its flow rate increased by the Venturi effect at the throttle section 625a where the flow path cross-sectional area is reduced, and its pressure is reduced. Therefore, the second temperature control medium TCM2 flowing from the first branch flow path 620b1 to the pumping flow path 620a through the throttle section 625a generates a suction force that draws the second temperature control medium TCM2 flowing through the second branch flow path 620b2 into the throttle section 625a. Due to this suction force, the second temperature control medium TCM2 that has been retained in the heat exchanger 63 after the failure of the heat exchanger 63 is detected and the valve device 626 blocks the second temperature control medium TCM2 from flowing through the second branch flow path 620b2 is sucked into the throttle section 625a and led to the pumping flow path 620a. This makes it possible to reduce the amount of second temperature control medium TCM2 remaining in the heat exchanger 63 after a failure of the heat exchanger 63 is detected and the valve device 626 blocks the second temperature control medium TCM2 from flowing through the second branch flow path 620b2, thereby further reducing the mixing of the conductive second temperature control medium TCM2 into the non-conductive first temperature control medium TCM1 due to the second temperature control medium TCM2 flowing into the first temperature control circuit 61 in the heat exchanger 63.

[0046] Returning to Fig. 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 electric motor 20 and the generator 30, as the viscosity increases, friction loss occurring in the electric motor 20 and the generator 30 increases, and the output efficiency of the electric motor 20 and the generator 30 decreases. Therefore, when the electric motor 20 and the generator 30 are not at high temperature and the temperature of the first temperature control medium TCM1 is equal to or lower than a predetermined temperature, such as when the electric motor 20 and the generator 30 are started, the first temperature control medium TCM1 does not need to be cooled, and it is preferable not to cool it.

[0047] When the detected temperature value of the first temperature control medium TCM1 output from the first temperature sensor 61a is below a predetermined temperature, the control device ECU controls the valve device 626 to fully close and block the flow of the second temperature control medium TCM2 through the second branch flow path 620b2.

[0048] When the flow of the second temperature control medium TCM2 through the second branch flow path 620b2 is blocked, the second temperature control medium TCM2 is not supplied to the heat exchanger 63, so that heat exchange is not performed 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, it is possible to prevent the first temperature control medium TCM1 from being cooled by the heat exchanger 63. This makes it possible to prevent the first temperature control medium TCM1 from being cooled by the heat exchanger 63 when cooling of the first temperature control medium TCM1 is not required.

[0049] When the heat exchanger failure detection unit 71 detects a failure of the heat exchanger 63, the control device ECU controls the internal combustion engine ICE so as to prohibit the internal combustion engine ICE from stopping its operation.

[0050] When the internal combustion engine ICE is prohibited from stopping, the internal combustion engine ICE runs continuously, and the first pump 611, which is driven by the power of the internal combustion engine ICE, also runs continuously. Therefore, when a failure of the heat exchanger 63 is detected, the first pump 611 runs continuously, so that the hydraulic pressure of the first temperature control medium TCM1, which is pumped by the first pump 611 and circulates through the first temperature control circuit 61, is maintained at or above a predetermined pressure. If the heat exchanger 63 fails, the first temperature control medium TCM1 and the second temperature control medium TCM2 will tend to flow into the flow path with lower liquid pressure in the heat exchanger 63. However, by maintaining the liquid pressure of the first temperature control medium TCM1 in the heat exchanger 63 at or above a predetermined pressure, even if the heat exchanger 63 fails and is damaged, it is possible to reduce the mixing of the conductive second temperature control medium TCM2 into the non-conductive first temperature control medium TCM1, which would occur if the second temperature control medium TCM2 flowed into the first temperature control circuit 61 in the heat exchanger 63.

[0051] [Second embodiment] Next, a vehicle temperature control system 10A according to a second embodiment of the present invention will be described with reference to Fig. 4. In the following description, the same components as those in the vehicle temperature control system 10 according to the first embodiment will be denoted by the same reference numerals, and the description will be omitted or simplified.

[0052] In the first embodiment of the vehicle temperature control system 10, a valve device 626 is provided in the second temperature control circuit 62 upstream of the heat exchanger 63 in the second branch flow path 620b2, i.e., between the branch portion 624 and the heat exchanger 63. However, in the second embodiment of the vehicle temperature control system 10A, the valve device 626 does not have to be provided. In the vehicle temperature control system 10 of the first embodiment, the second temperature control circuit 62 further includes a first branch flow path 620b1 having a branch portion 624 and a junction portion 625, a power converter 50 provided therein, an upstream end connected to the branch portion 624, a downstream end connected to the junction portion 625 through the power converter 50, and a second branch flow path 620b2 having a heat exchanger 63 provided therein, an upstream end connected to the branch portion 624, a downstream end connected to the junction portion 625 through the heat exchanger 63, but in the vehicle temperature control system 10A of the second embodiment, the second temperature control circuit 62 may include a power converter 50 and a heat exchanger 63 provided in series. Hereinafter, the differences between the vehicle temperature control system 10 of the first embodiment and the vehicle temperature control system 10A of the second embodiment will be described in detail.

[0053] As shown in FIG. 4, the second temperature control circuit 62 of the present embodiment has a circulation flow path 620c formed such that the second pump 621, the radiator 622, the power conversion device 50, and the heat exchanger 63 are provided in this order from the upstream side, starting from the storage tank 623, and return to the storage tank 623 again. The second temperature control medium TCM2 flowing through the circulation flow path 620c is discharged from the storage tank 623, pumped by the second pump 621, cooled by the radiator 622, and supplied to the power conversion device 50, and after cooling the power conversion device 50, is supplied to the heat exchanger 63, where it exchanges heat with the first temperature control medium TCM1 flowing through the first temperature control circuit 61 to cool the first temperature control medium TCM1, and returns to the storage tank 623 again. In this way, the second temperature control medium TCM2 circulates through the second temperature control circuit 62.

[0054] The control device ECU controls the second pump 621 so that the rotation speed of the second pump 621 when a failure of the heat exchanger 63 is detected is lower than the rotation speed of the second pump 621 when a failure of the heat exchanger 63 is not detected. Therefore, the liquid pressure of the second temperature control medium TCM2 in the heat exchanger 63 when a failure of the heat exchanger 63 is detected is lower than the liquid pressure of the second temperature control medium TCM2 in the heat exchanger 63 when a failure of the heat exchanger 63 is not detected.

[0055] If the heat exchanger 63 fails, the first temperature control medium TCM1 and the second temperature control medium TCM2 tend to flow into the flow path with lower fluid pressure in the heat exchanger 63. However, because the fluid pressure of the second temperature control medium TCM2 in the heat exchanger 63 becomes lower, even if the heat exchanger 63 fails and is damaged, the mixing of the conductive second temperature control medium TCM2 into the non-conductive first temperature control medium TCM1 due to the second temperature control medium TCM2 flowing into the first temperature control circuit 61 in the heat exchanger 63 can be reduced.

[0056] Although the embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such embodiments. It is clear that a person skilled in the art can come up with various modifications or alterations within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present invention. In addition, the components in the above embodiments may be arbitrarily combined within the scope of the invention.

[0057] For example, the second temperature control circuit 62 in the second embodiment has a circulation flow path 620c that starts from a storage tank 623 and has a second pump 621, a radiator 622, a heat exchanger 63, and a power conversion device 50 arranged in this order from the upstream side, and returns to the storage tank 623, but may have a configuration similar to that of the first temperature control circuit 61 in the first embodiment. That is, the second temperature control circuit 62 of the second embodiment may have a branch section 624 and a junction section 625, a pressure flow path 620a in which a storage tank 623, a second pump 621, and a radiator 622 are arranged in this order from the upstream side, and in which an upstream end is connected to the junction section 625 and passes through the storage tank 623, the second pump 621, and the radiator 622 to connect to the branch section 624, a first branch flow path 620b1 in which a power conversion device 50 is provided and in which an upstream end is connected to the branch section 624, and in which the power conversion device 50 is passed through and in which the downstream end is connected to the junction section 625, and a second branch flow path 620b2 in which a heat exchanger 63 is provided and in which an upstream end is connected to the branch section 624, and in which the heat exchanger 63 is passed through and in which the downstream end is connected to the junction section 625.

[0058] Furthermore, for example, the second temperature control circuit 62 in the first and second embodiments is configured to control the temperature of the power conversion device 50, but the temperature-controlled device whose temperature is controlled by the second temperature control circuit 62 does not have to be the power conversion device 50, and may be any device that requires temperature control.

[0059] This specification describes at least the following items. In parentheses, components corresponding to the above-described embodiment are shown as examples, but the present invention is not limited to these.

[0060] (1) a first temperature control circuit (first temperature control circuit 61) in which a non-conductive first temperature control medium (first temperature control medium TCM1) circulates and in which a first pump (first pump 611) is provided; a second temperature control circuit (second temperature control circuit 62) in which a conductive second temperature control medium (second temperature control medium TCM2) circulates and in which a second pump (second pump 621) is provided; a heat exchanger (heat exchanger 63) for exchanging heat between the first temperature control medium and the second temperature control medium; A vehicle temperature control system (vehicle temperature control system 10) including a control device (control device ECU), The second temperature control circuit is A branching portion (branching portion 624) and a merging portion (merging portion 625), a pressure-feeding flow path (620a) provided with the second pump, one end (downstream end) of which is connected to the branching portion and the other end (upstream end) of which is connected to the junction portion; a first branch flow path (first branch flow path 620b1) having a temperature-controlled device (power conversion device 50) and one end (upstream end) connected to the branch portion and the other end (downstream end) connected to the junction portion; a second branch flow path (second branch flow path 620b2) having one end (upstream end) connected to the branch portion and the other end (downstream end) connected to the junction portion, the second temperature control medium is pumped by the first pump and flows through the pressure flow path, and branches into the first branch flow path and the second branch flow path at the branching portion, the second temperature control medium flowing through the first branch flow path and the second temperature control medium flowing through the second branch flow path join at the junction portion, flow through the pressure flow path and are supplied to the first pump, and the second temperature control medium circulates through the second temperature control circuit; A valve device (valve device 626) that adjusts the flow rate of the second temperature control medium flowing through the second branch flow path is provided between the branch portion and the heat exchanger, The control device includes: When a failure of the heat exchanger is detected, the valve device is controlled to block the second temperature control medium from flowing through the second branch flow path.

[0061] According to (1), when the control device detects a failure of the heat exchanger, the control device controls the valve device to block the second temperature control medium from flowing through the second branch flow path, so that when a failure of the heat exchanger is detected, the second temperature control medium is not supplied to the heat exchanger. Therefore, even if the heat exchanger fails and is damaged, it is possible to reduce the mixing of the conductive second temperature control medium with the non-conductive first temperature control medium caused by the second temperature control medium flowing into the first temperature control circuit at the heat exchanger.

[0062] (2) The vehicle temperature control system according to (1), At the junction, a throttle section (throttle section 625a) in which the flow path cross-sectional area is reduced is formed at the other end of the first branch flow path, and the other end of the second branch flow path is connected to the first branch flow path at the throttle section. A temperature control system for a vehicle.

[0063] According to (2), at the junction, a throttle section where the flow cross-sectional area is reduced is formed at the other end of the first branch flow path, and the other end of the second branch flow path is connected to the first branch flow path at the throttle section, so that the second temperature control medium flowing from the first branch flow path to the pumping flow path through the junction increases in flow rate and decreases in pressure due to the Venturi effect at the throttle section where the flow cross-sectional area is reduced. Therefore, the second temperature control medium flowing from the first branch flow path to the pumping flow path through the throttle section generates a suction force that sucks the second temperature control medium flowing in the second branch flow path into the throttle section. This suction force detects a failure of the heat exchanger, and the second temperature control medium that remains in the heat exchanger after the valve device blocks the second temperature control medium from flowing in the second branch flow path is sucked into the throttle section and led to the junction. This makes it possible to reduce the amount of second temperature-control medium remaining in the heat exchanger after a failure of the heat exchanger is detected and the valve device blocks the second temperature-control medium from flowing through the second branch flow path, thereby further reducing the mixing of the conductive second temperature-control medium with the non-conductive first temperature-control medium caused by the second temperature-control medium flowing into the first temperature control circuit in the heat exchanger.

[0064] (3) an internal combustion engine (ICE); a first temperature control circuit (first temperature control circuit 61) in which a non-conductive first temperature control medium (first temperature control medium TCM1) circulates and in which a first pump (first pump 611) is provided; a second temperature control circuit (second temperature control circuit 62) in which a conductive second temperature control medium (second temperature control medium TCM2) circulates and in which a second pump (second pump 621) is provided; a heat exchanger (heat exchanger 63) for exchanging heat between the first temperature control medium and the second temperature control medium; A vehicle temperature control system (vehicle temperature control system 10) including a control device (control device ECU), the first pump is driven by power of the internal combustion engine, The control device, when detecting a failure of the heat exchanger, controls the internal combustion engine so as to prohibit the internal combustion engine from stopping operation.

[0065] According to (3), when the control device detects a failure of the heat exchanger, it controls the internal combustion engine to prohibit the internal combustion engine from stopping, so that when a failure of the heat exchanger is detected, the first pump is constantly driven and the liquid pressure of the first temperature control medium pumped by the first pump and circulating through the first temperature control circuit is maintained at or above a predetermined pressure. This makes it possible to reduce the mixing of the conductive second temperature control medium with the non-conductive first temperature control medium, which would otherwise occur if the heat exchanger were to break down and cause the second temperature control medium to flow into the first temperature control circuit at the heat exchanger.

[0066] (4) a first temperature control circuit (first temperature control circuit 61) in which a non-conductive first temperature control medium (first temperature control medium TCM1) circulates and in which a first pump (first pump 611) is provided; a second temperature control circuit (second temperature control circuit 62) in which a conductive second temperature control medium (second temperature control medium TCM2) circulates and in which a second pump (second pump 621) is provided; a heat exchanger (heat exchanger 63) for exchanging heat between the first temperature control medium and the second temperature control medium; A vehicle temperature control system (vehicle temperature control system 10) including a control device (control device ECU), the second pump is an electric pump controllable by the control device, The control device controls the second pump so that the rotation speed of the second pump when a failure of the heat exchanger is detected is lower than the rotation speed of the second pump when a failure of the heat exchanger is not detected.

[0067] According to (4), the control device controls the second pump so that the rotation speed of the second pump when a heat exchanger failure is detected is lower than the rotation speed of the second pump when a heat exchanger failure is not detected, so that the liquid pressure of the second temperature control medium in the heat exchanger when a heat exchanger failure is detected is lower than the liquid pressure of the second temperature control medium in the heat exchanger when a heat exchanger failure is not detected. This makes it possible to reduce the mixing of the conductive second temperature control medium with the non-conductive first temperature control medium, which would occur if the heat exchanger were to fail and break, by the second temperature control medium flowing into the first temperature control circuit in the heat exchanger.

[0068] (5) A vehicle temperature control system according to any one of (1) to (4), the second pump is an electric pump; The control device detects a failure of the heat exchanger based on a change in the rotation speed of the second pump.

[0069] According to (5), the control device detects a failure of the heat exchanger based on a change in the rotation speed of the second pump, so that the control device can detect a failure of the heat exchanger with a simple configuration and the vehicle temperature control system can be made smaller. [Explanation of symbols]

[0070] 10 Vehicle temperature control system 50 Power conversion device (temperature controlled device) 61 1st temperature control circuit 611 First Pump 62 2nd temperature control circuit 620a Pressure flow path 620b1 First branch flow path 620b2 Second branch flow path 621 Second Pump 624 Branch 625 Junction 625a Squeezing section 626 Valve device 63 Heat exchanger ECU Control Unit ICE Internal Combustion Engine TCM1 1st temperature control medium TCM2 Second temperature control medium

Claims

1. a first temperature control circuit in which a non-conductive first temperature control medium circulates and in which a first pump is provided; a second temperature control circuit in which a conductive second temperature control medium circulates and in which a second pump is provided; a heat exchanger that exchanges heat between the first temperature control medium and the second temperature control medium; A vehicle temperature control system comprising: The second temperature control circuit is A branching section and a junction section; a pressure-feeding flow path provided with the second pump, the pressure-feeding flow path having one end connected to the branching portion and the other end connected to the junction portion; a first branch flow path having a temperature-controlled device, one end of the first branch flow path being connected to the branch portion and the other end of the first branch flow path being connected to the junction portion; a second branch flow path having the heat exchanger, one end connected to the branch portion and the other end connected to the junction portion; the second temperature control medium is pumped by the second pump and flows through the pressure flow path, and branches into the first branch flow path and the second branch flow path at the branching portion, the second temperature control medium flowing through the first branch flow path and the second temperature control medium flowing through the second branch flow path join at the junction portion, flow through the pressure flow path and are supplied to the first pump, and the second temperature control medium circulates through the second temperature control circuit, a valve device that adjusts a flow rate of the second temperature control medium flowing through the second branch flow path is provided between the branch portion and the heat exchanger, The control device includes: When a failure of the heat exchanger is detected, the valve device is controlled to block the second temperature control medium from flowing through the second branch flow path.

2. The vehicle temperature control system according to claim 1, a constriction portion in which a cross-sectional area of ​​a flow path is reduced at the other end of the first branch flow path at the confluence portion, and the other end of the second branch flow path is connected to the first branch flow path at the constriction portion.

3. An internal combustion engine; a first temperature control circuit in which a non-conductive first temperature control medium circulates and in which a first pump is provided; a second temperature control circuit in which a conductive second temperature control medium circulates and in which a second pump is provided; a heat exchanger that exchanges heat between the first temperature control medium and the second temperature control medium; A vehicle temperature control system comprising: the first pump is driven by power of the internal combustion engine, The control device, when detecting a failure of the heat exchanger, controls the internal combustion engine so as to prohibit the internal combustion engine from stopping operation.

4. a first temperature control circuit in which a non-conductive first temperature control medium circulates and in which a first pump is provided; a second temperature control circuit in which a conductive second temperature control medium circulates and in which a second pump is provided; a heat exchanger that exchanges heat between the first temperature control medium and the second temperature control medium; A vehicle temperature control system comprising: the second pump is an electric pump controllable by the control device, The control device controls the second pump so that the rotation speed of the second pump when a failure of the heat exchanger is detected is lower than the rotation speed of the second pump when a failure of the heat exchanger is not detected.

5. The vehicle temperature control system according to any one of claims 1 to 4, the second pump is an electric pump; The control device detects a failure of the heat exchanger based on a change in the rotation speed of the second pump.

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