JP2023011133A - Vehicular heat management system - Google Patents

Abstract

To appropriately perform on-vehicle battery cooling and cabin interior air-conditioning and effectively cool an on-vehicle electrical component by cooling cooling water while cooling inside of a cabin even at a high temperature.SOLUTION: A vehicular heat management system includes: a first refrigerant circuit 1 used for cabin interior air-conditioning and having an inside air cooler 16 for exchanging heat between a first refrigerant and indoor air; a cooling water circuit 2 having a radiator 22 and cooling an electrical component 21 by using cooling water; a second refrigerant circuit 3 used for battery temperature control and having a second refrigerant/outside air heat exchanger 32 for exchanging heat between a second refrigerant and outside air; a first refrigerant/cooling water heat exchanger 4; and a second refrigerant/cooling water heat exchanger 5. In a cabin interior-cooling cooling water cooling mode of cooling inside of the cabin and cooling the cooling water, the first refrigerant in the first refrigerant circuit 1 absorbs heat from indoor air in the inside air cooler 16, the cooling water in the cooling water circuit 2 releases heat to outside air in the radiator 22, and the second refrigerant in the second refrigerant circuit 3 releases heat to outside air in the second refrigerant/outside air heat exchanger 32 and absorbs heat from the cooling water in the cooling water circuit 2 in the second refrigerant/cooling water heat exchanger 5.SELECTED DRAWING: Figure 2

Description

The present invention relates to vehicle thermal management systems.

Electric vehicles (EVs) and plug-in hybrid vehicles (PHVs), which mainly run on electric power, use lithium-ion batteries as power storage devices to store the power supplied to the motors for running. A secondary battery, a nickel metal hydride secondary battery, etc. are installed.

Batteries generate heat during charging and discharging, and deterioration is accelerated if the high-temperature state continues. Electric parts such as a running motor and a CPU (Control Power Unit) may also be damaged or malfunction if they become excessively hot during high-speed running. For this reason, electric vehicles and the like are generally equipped with a cooling system such as a cooling water circuit for cooling batteries and electrical parts.

On the other hand, electric vehicles and the like, which cannot use the combustion exhaust heat of the internal combustion engine to heat the interior of the vehicle, use a PTC (Positive Temperature Coefficient) heater or a heat pump circuit to heat the interior of the vehicle.

However, heating using a PTC heater that uses an in-vehicle battery as an energy source has the problem that the energy consumption efficiency is relatively low and the cruising distance is short. In addition, heating using a heat pump circuit uses air heat as an energy source in addition to the vehicle battery, so energy consumption efficiency is higher than heating using a PTC heater, but it is sufficient when the outside temperature is low in cold regions. There is a problem that heating cannot be done at

Patent Literature 1 discloses a conventional vehicle heat management system suitable for application to electric vehicles and the like. In this vehicle heat management system, the heat pump circuit air-conditions the interior of the vehicle, and the cooling water circuit cools the battery and electrical components. A refrigerant/cooling water heat exchanger connects the heat pump circuit and the cooling water circuit, and the refrigerant/cooling water heat exchanger functions as an evaporator in the heating mode of the heat pump circuit.

As a result, when the vehicle interior is heated, the batteries and electric parts are cooled by the cooling water, and the refrigerant/cooling water heat exchanger cools the batteries and electric parts. heat is dissipated to In this way, the exhaust heat from the batteries and electrical parts is effectively used as a heat source to heat the vehicle interior, thereby efficiently heating the vehicle interior and cooling the batteries and electrical parts.

JP 2010-111269 A

BACKGROUND ART In recent years, from the viewpoint of improving the global environment, battery-equipped vehicles such as electric vehicles have attracted attention in the automobile industry, and their penetration rate is increasing. Therefore, there is a demand for a new development of a system for properly cooling the battery and electric parts and air-conditioning the vehicle interior in the battery-equipped vehicle.

In particular, when it is hot in the summer, the temperature of the cooling water in the cooling water circuit tends to become high. There is

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. A technical problem to be solved is to provide a vehicle thermal management system that can appropriately cool vehicle-mounted electrical components by reducing the temperature.

The vehicle heat management system of the present invention includes:
A first compressor that compresses a first refrigerant and circulates the first refrigerant in a circuit, a first expansion valve, and an internal air cooler that exchanges heat between the first refrigerant and indoor air supplied to the vehicle interior. and a first refrigerant circuit that air-conditions the interior of the vehicle;
a cooling water circuit for cooling vehicle-mounted electrical components, comprising a water pump for circulating cooling water in the circuit and a radiator for exchanging heat between the cooling water and outside air;
a second compressor that compresses a second refrigerant and circulates the second refrigerant in a circuit; a second refrigerant/outside air heat exchanger that exchanges heat between the second refrigerant and the outside air; and a second expansion valve. and a second refrigerant circuit that adjusts the temperature of the vehicle battery;
a first refrigerant/cooling water heat exchanger connected to the first refrigerant circuit and the cooling water circuit for exchanging heat between the first refrigerant and the cooling water;
a second refrigerant/cooling water heat exchanger connected to the second refrigerant circuit and the cooling water circuit to exchange heat between the second refrigerant and the cooling water;
a control unit that controls operations of the first refrigerant circuit, the cooling water circuit, and the second refrigerant circuit;
The first refrigerant circuit, the cooling water circuit, and the second refrigerant circuit operate in a vehicle interior cooling water cooling mode for cooling the vehicle interior and cooling the cooling water under the control of the control unit,
In the first refrigerant circuit in the vehicle interior cooling water cooling mode, the first refrigerant compressed by the first compressor functions as a condenser of the first refrigerant circuit for heat exchange between the first refrigerant and the cooling water. the first refrigerant decompressed by the first expansion valve after heat dissipation absorbs heat from the room air in the inside air cooler functioning as an evaporator of the first refrigerant circuit;
In the cooling water circuit in the vehicle interior cooling cooling water cooling mode, the cooling water circulating in the circuit absorbs heat from the first refrigerant in the first refrigerant/cooling water heat exchanger, and is transferred to the radiator. radiating heat to the outside air and radiating heat to the second refrigerant at the second refrigerant/cooling water heat exchanger;
In the second refrigerant circuit in the vehicle interior cooling water cooling mode, the second refrigerant/outside air heat exchanger in which the second refrigerant compressed by the second compressor functions as a condenser of the second refrigerant circuit. and the second refrigerant decompressed by the second expansion valve after the heat is released into the cooling water by the second refrigerant/cooling water heat exchanger that functions as an evaporator of the second refrigerant circuit. It is characterized by absorbing heat from

In this vehicle heat management system, the first refrigerant circuit, the cooling water circuit, and the second refrigerant circuit operate in the vehicle interior cooling water cooling mode under the control of the control unit. In the passenger compartment cooling water cooling mode, the first refrigerant circuit that air-conditions the passenger compartment operates to cool the passenger compartment, while the second refrigerant circuit that adjusts the temperature of the on-board battery cools the cooling water in the cooling water circuit. to operate.

In the second refrigerant circuit in the vehicle interior cooling water cooling mode, the second refrigerant absorbs heat from the cooling water in the cooling water circuit in the second refrigerant/cooling water heat exchanger that functions as an evaporator, thereby cooling the cooling water. do. After absorbing the heat, the second refrigerant is compressed by the second compressor, becomes hot, and releases heat to the outside air by the second refrigerant/outside air heat exchanger functioning as a condenser. After releasing the heat, the second refrigerant is depressurized by the second expansion valve and introduced into the second refrigerant/cooling water heat exchanger.

In the cooling water circuit in the vehicle interior cooling water cooling mode, the cooling water circulating in the circuit absorbs heat from the first refrigerant in the first refrigerant/cooling water heat exchanger, absorbs heat from the on-vehicle electrical components, and heats the radiator. , heat is released to the outside air, and heat is released to the second refrigerant at the second refrigerant/cooling water heat exchanger. In-vehicle electrical components can be appropriately cooled by the cooling water that has been cooled by radiating heat to the outside air in the radiator and radiating heat to the second refrigerant in the second refrigerant/cooling water heat exchanger.

In the first refrigerant circuit in the passenger compartment cooling water cooling mode, the first refrigerant absorbs heat from the indoor air in the inside air cooler that functions as an evaporator, thereby cooling the passenger compartment. After absorbing the heat, the first refrigerant is compressed by the first compressor to a high temperature, and radiates heat to the cooling water of the cooling water circuit in the first refrigerant/cooling water heat exchanger functioning as a condenser. After heat release, the first refrigerant is decompressed by the first expansion valve and introduced into the internal air cooler.

Thus, in the passenger compartment cooling water cooling mode, the cooling water in the cooling water circuit can be cooled by the second refrigerant circuit while the inside of the passenger compartment is cooled by the first refrigerant circuit. Therefore, it is possible to cool the cooling water in the cooling water circuit according to the cooling capacity of the second refrigerant circuit and lower the temperature of the cooling water, while cooling the vehicle interior even in hot summer weather. can be cooled to

On the other hand, in this vehicle heat management system, the second refrigerant circulating in the second refrigerant circuit can cool the on-board battery according to the cooling capacity of the second refrigerant circuit, so the on-board battery can be cooled appropriately. become.

Therefore, according to this vehicle heat management system, in a battery-equipped vehicle, it is possible to appropriately cool the on-board battery and air-condition the vehicle interior. It can be lowered to properly cool the on-vehicle electrical components.

The control unit may execute the vehicle interior cooling water cooling mode when the temperature of the cooling water exceeds a predetermined range, and may not execute the vehicle interior cooling water cooling mode when the temperature of the cooling water is within the predetermined range. preferable.

In this case, the power consumption of the second compressor can be omitted because the second compressor of the second refrigerant circuit does not operate if the temperature of the cooling water is within the predetermined range. In this case, cooling of the cooling water in the cooling water circuit may be performed only by the radiator.

The first refrigerant circuit preferably has a first refrigerant/inside air heat exchanger that exchanges heat between the first refrigerant and the indoor air, and a third expansion valve. It is preferable to have a battery heat exchanger for exchanging heat with a vehicle-mounted battery, and a fourth expansion valve.

The control unit includes a first normal mode in which heat is exchanged between the first refrigerant and room air in the first refrigerant/inside air heat exchanger and the first refrigerant is expanded in the third expansion valve; It is possible to switch between a first stop mode in which heat exchange between the first refrigerant and room air is stopped in the heat exchanger and the first refrigerant is circulated in a state where expansion in the third expansion valve is stopped. is preferred.

The control unit performs heat exchange between the first refrigerant and the room air in the inside air cooler, and expands the first refrigerant in the first expansion valve in a second normal mode. It is preferable to switch between a second stop mode in which heat exchange with air is stopped and the first refrigerant is circulated in a state in which expansion in the first expansion valve is stopped.

The control unit operates in a third normal mode in which heat is exchanged between the second refrigerant and the on-vehicle battery in the battery heat exchanger and the second refrigerant expands in the fourth expansion valve, and in which the second refrigerant in the battery heat exchanger. It is preferable to be able to switch between a third stop mode in which the second refrigerant is circulated in a state in which the heat exchange with the vehicle battery is stopped and the expansion in the fourth expansion valve is stopped.

The controller controls a fourth normal mode in which the second refrigerant/coolant heat exchanger heat-exchanges the second refrigerant and the cooling water and the second expansion valve expands the second refrigerant; It is possible to switch between a fourth stop mode in which the heat exchange between the second refrigerant and the cooling water is stopped in the cooling water heat exchanger and the second refrigerant is circulated while the expansion in the second expansion valve is stopped. is preferably

It is preferable that the control unit performs control to operate in the first stop mode, the second normal mode, the third stop mode, and the fourth normal mode in the passenger compartment cooling water cooling mode.

In a first refrigerant circuit having a first refrigerant/inside air heat exchanger and a third expansion valve, heat exchange between the first refrigerant and the inside air in the first refrigerant/inside air heat exchanger in a vehicle interior cooling water cooling mode. is stopped and the first refrigerant is circulated in a state in which expansion at the third expansion valve is stopped, and heat is exchanged between the first refrigerant and the room air in the inside air cooler The first refrigerant circulating in the first refrigerant circuit is operated in the second normal mode in which the first refrigerant is expanded by the first expansion valve together with the first refrigerant/cooling water heat exchanger functioning as a condenser. In addition to radiating heat to the cooling water, the internal air cooler functioning as an evaporator absorbs heat from the indoor air to cool the vehicle interior.

In a second refrigerant circuit having a battery heat exchanger and a fourth expansion valve, in a vehicle interior cooling water cooling mode, the battery heat exchanger stops heat exchange between the second refrigerant and the vehicle battery, and the fourth expansion valve is operated in a third stop mode in which the second refrigerant is circulated while the expansion is stopped, and heat is exchanged between the second refrigerant and the cooling water in the second refrigerant/cooling water heat exchanger, and the second By operating in the fourth normal mode in which the second refrigerant is expanded by the second expansion valve, the second refrigerant circulating in the second refrigerant circuit is transferred to the outside air by the second refrigerant/outside air heat exchanger functioning as a condenser. In addition, heat is absorbed from the cooling water by the second refrigerant/cooling water heat exchanger functioning as an evaporator to cool the cooling water.

Thus, the first refrigerant circuit is operated in the first stop mode and the second normal mode, and the second refrigerant circuit is operated in the third stop mode and the fourth normal mode, whereby the first refrigerant circuit, the cooling water The circuit and the second refrigerant circuit operate in the passenger compartment cooling water cooling mode, and the cooling water in the cooling water circuit can be effectively cooled while cooling the passenger compartment.

It is preferable that the second refrigerant circuit operates in a battery cooling mode for cooling the vehicle battery under the control of the controller.

It is preferable that the control unit performs control to operate in the battery cooling mode, the third normal mode, and the fourth stop mode.

In the second refrigerant circuit in the battery cooling mode, the second refrigerant compressed by the second compressor radiates heat to the outside air in the second refrigerant/outside air heat exchanger that functions as a condenser of the second refrigerant circuit. It is preferable that the second refrigerant decompressed by the four expansion valves absorbs heat from the onboard battery in the battery heat exchanger functioning as an evaporator of the second refrigerant circuit.

The second refrigerant circuit is operated in a third normal mode in which heat is exchanged between the second refrigerant and the onboard battery in the battery heat exchanger and the second refrigerant is expanded in the fourth expansion valve, and the second refrigerant/ Operation is performed in a fourth stop mode in which the second refrigerant is circulated while stopping the heat exchange between the second refrigerant and the cooling water in the cooling water heat exchanger and stopping the expansion in the second expansion valve. As a result, the second refrigerant circulating in the second refrigerant circuit releases heat to the outside air through the second refrigerant/outside air heat exchanger that functions as a condenser, and absorbs heat from the vehicle battery through the battery heat exchanger that functions as an evaporator. Then, the vehicle battery can be cooled.

It is preferable that the first refrigerant circuit and the cooling water circuit operate in a vehicle interior heating mode for heating the vehicle interior under the control of the controller.

It is preferable that the control unit performs control to operate in the first normal mode and the second stop mode in the passenger compartment heating mode.

In the first refrigerant circuit in the vehicle interior heating mode, the first refrigerant compressed by the first compressor releases heat to the indoor air in the first refrigerant/inside air heat exchanger that functions as a condenser of the first refrigerant circuit, and heats up. It is preferable that the first refrigerant depressurized later by the third expansion valve absorbs heat from the cooling water in the first refrigerant/cooling water heat exchanger functioning as an evaporator of the first refrigerant circuit.

In the cooling water circuit in the vehicle interior heating mode, it is preferable that the cooling water circulating in the circuit absorbs heat from the vehicle-mounted electrical components and radiates heat to the first refrigerant in the first refrigerant/cooling water heat exchanger. When the temperature of the outside air is higher than the temperature of the cooling water, heat may be absorbed from the outside air by the radiator while absorbing heat from the on-vehicle electric parts, or the heat may be absorbed from the outside air by the radiator instead of absorbing heat from the on-vehicle electric parts. .

In the vehicle interior heating mode, the first refrigerant circuit can effectively heat the first refrigerant using the waste heat of the vehicle-mounted electrical components that has absorbed heat from the vehicle-mounted electrical components in the cooling water circuit as a heat source. The interior of the vehicle can be effectively heated. Also, it is possible to prevent the cooling water from becoming excessively low temperature due to the air heat absorbed from the outside air by the radiator.

It is preferable that the second refrigerant circuit has a direction switching portion that reverses the circulation direction of the second refrigerant.

It is preferable that the second refrigerant circuit operates in a battery warm-up mode in which the vehicle battery is warmed up under the control of the controller.

The control unit controls to operate in the third normal mode and the fourth stop mode in the battery warm-up mode, and in the second refrigerant circuit, the second refrigerant compressed by the second compressor heats the battery. It is preferable that the circulation direction of the second refrigerant is controlled by the direction switching unit so as to head toward the exchanger.

In the second refrigerant circuit in the battery warm-up mode, the second refrigerant compressed by the second compressor radiates heat to the on-vehicle battery in the battery heat exchanger that functions as a condenser of the second refrigerant circuit, and after the heat is released, the second refrigerant expands to the fourth expansion. It is preferable that the second refrigerant depressurized by the valve absorbs heat from outside air in the second refrigerant/outside air heat exchanger that functions as an evaporator of the second refrigerant circuit.

In the second refrigerant circuit, the direction switching unit controls the circulation direction of the second refrigerant so that the second refrigerant compressed by the second compressor is directed to the battery heat exchanger, and the second refrigerant is directed to the battery heat exchanger. It is operated in a third normal mode in which the refrigerant and the battery are heat-exchanged and the second refrigerant is expanded by the fourth expansion valve, and the second refrigerant and the cooling water are exchanged by the second refrigerant/cooling water heat exchanger. By operating in the fourth stop mode in which the second refrigerant is circulated in a state where heat exchange is stopped and expansion at the second expansion valve is stopped, the second refrigerant circulating in the second refrigerant circuit does not evaporate. The second refrigerant/outside air heat exchanger that functions as a condenser absorbs heat from the outside air, and the battery heat exchanger that functions as a condenser dissipates heat to the onboard battery to warm up the onboard battery.

The first refrigerant circuit includes a first refrigerant/internal air heat exchanger bypass that bypasses the first refrigerant/inside air heat exchanger and the third expansion valve, and a first refrigerant/inside air heat exchanger bypassing the first refrigerant/internal air heat exchanger and the third expansion valve. It is preferable to have a first refrigerant/inside air heat exchanger bypass switching unit for switching between flowing to the first refrigerant/internal air heat exchanger bypass side and flowing to the first refrigerant/inside air heat exchanger bypass side.

The control unit causes the first refrigerant/inside air heat exchanger bypass switching unit to flow the first refrigerant to the first refrigerant/inside air heat exchanger and the third expansion valve side in the first normal mode, and the first stop mode. , it is preferable to flow the first refrigerant to the first refrigerant/internal air heat exchanger bypass side by the first refrigerant/inside air heat exchanger bypass switching unit.

In the first refrigerant circuit having the first refrigerant/internal air heat exchanger bypass and the first refrigerant/inside air heat exchanger bypass switching unit, the first refrigerant is switched by the first refrigerant/inside air heat exchanger bypass switching unit in the first normal mode. to the first refrigerant/internal air heat exchanger and the third expansion valve side, the first refrigerant/inside air heat exchanger can function as a condenser in which the first refrigerant releases heat to the indoor air in the vehicle interior heating mode. and by causing the first refrigerant/internal air heat exchanger bypass switching unit to flow the first refrigerant to the first refrigerant/inside air heat exchanger bypass side in the first stop mode, the second 1, the refrigerant/air heat exchanger can be deactivated.

The first refrigerant circuit switches between the internal air cooler bypass that bypasses the internal air cooler and the first expansion valve, and whether the first refrigerant flows to the internal air cooler and the first expansion valve side or to the internal air cooler bypass side. It is preferable to have an inside air cooler bypass switching part.

The control unit causes the inside air cooler bypass switching unit to flow the first refrigerant to the inside air cooler and the first expansion valve side in the second normal mode, and causes the inside air cooler bypass switching unit to flow in the second stop mode. It is preferable to flow the first refrigerant to the internal air cooler bypass side.

In the first refrigerant circuit having the internal air cooler bypass and the internal air cooler bypass switching unit, in the second normal mode, the internal air cooler bypass switching unit causes the first refrigerant to flow toward the internal air cooler and the first expansion valve, In the vehicle interior cooling water cooling mode, the inside air cooler can be made to function as an evaporator in which the first refrigerant absorbs heat from the room air, and in the second stop mode, the inside air cooler bypass switching unit allows the first refrigerant to be transferred to the inside air. By flowing the air to the cooler bypass side, the function of the inside air cooler can be stopped in the passenger compartment heating mode.

The second refrigerant circuit includes a battery heat exchanger bypass that bypasses the battery heat exchanger and the fourth expansion valve, and a second refrigerant that flows to the battery heat exchanger and the fourth expansion valve side or to the battery heat exchanger bypass side. It is preferable to have a battery heat exchanger bypass switching unit for switching whether to flow or not.

The control unit causes the battery heat exchanger bypass switching unit to flow the second refrigerant to the battery heat exchanger and the fourth expansion valve side in the third normal mode, and the battery heat exchanger bypass in the third stop mode. It is preferable that the switching unit causes the second refrigerant to flow to the battery heat exchanger bypass side.

In the second refrigerant circuit having the battery heat exchanger bypass and the battery heat exchanger bypass switching unit, in the third normal mode, the second refrigerant is switched to the battery heat exchanger and the fourth expansion valve side by the battery heat exchanger bypass switching unit. In the battery cooling mode, the battery heat exchanger functions as an evaporator in which the second refrigerant absorbs heat from the vehicle battery, and in the battery warm-up mode, the battery heat exchanger is a condenser in which the second refrigerant releases heat to the vehicle battery. and the battery heat exchanger in the vehicle interior cooling water cooling mode by flowing the second refrigerant to the battery heat exchanger bypass side by the battery heat exchanger bypass switching unit in the third stop mode function can be stopped.

The second refrigerant circuit includes a second refrigerant/coolant heat exchanger bypass that bypasses the second refrigerant/coolant heat exchanger and the second expansion valve, and a second refrigerant/coolant heat exchanger that bypasses the second refrigerant/coolant heat exchanger and the second refrigerant/coolant heat exchanger. It is preferable to have a second refrigerant/cooling water heat exchanger bypass switching unit for switching between flowing to the second expansion valve side and flowing to the second refrigerant/cooling water heat exchanger bypass side.

In the fourth normal mode, the control unit causes the second refrigerant/cooling water heat exchanger bypass switching unit to flow the second refrigerant to the second refrigerant/cooling water heat exchanger and the second expansion valve side, and In the stop mode, it is preferable to flow the second refrigerant to the second refrigerant/cooling water heat exchanger bypass side by the front two refrigerant/cooling water heat exchanger bypass switching unit.

In the second refrigerant circuit having the second refrigerant/cooling water heat exchanger bypass and the second refrigerant/cooling water heat exchanger bypass switching unit, in the fourth normal mode, the second refrigerant/cooling water heat exchanger bypass switching unit By flowing the second refrigerant to the side of the second refrigerant/cooling water heat exchanger and the second expansion valve, the second refrigerant absorbs heat from the cooling water in the second refrigerant/cooling water heat exchanger in the vehicle interior cooling water cooling mode. In the fourth stop mode, the second refrigerant/cooling water heat exchanger bypass switching unit causes the second refrigerant to flow to the second refrigerant/cooling water heat exchanger bypass side. , the function of the second refrigerant/coolant heat exchanger can be deactivated in the battery cooling mode and the battery warming mode.

According to the vehicle heat management system of the present invention, it is possible to appropriately cool the on-board battery and air-condition the interior of the vehicle in a battery-equipped vehicle. It can be lowered to properly cool the on-vehicle electrical components.

FIG. 1 is a system configuration diagram schematically showing the overall configuration of a vehicle heat management system according to an embodiment. FIG. 2 is a system configuration diagram that relates to the vehicle heat management system of the embodiment and explains a vehicle interior cooling water cooling mode. FIG. 3 is a system configuration diagram for explaining a vehicle interior cooling mode, relating to the vehicle heat management system of the embodiment. FIG. 4 relates to the vehicle heat management system of the embodiment, and is a system configuration diagram for explaining the vehicle interior heating mode. FIG. 5 is a system configuration diagram for explaining a battery cooling mode, relating to the vehicle heat management system of the embodiment. FIG. 6 is a system configuration diagram for explaining a battery warm-up mode, relating to the vehicle heat management system of the embodiment. FIG. 7 relates to the vehicle heat management system of the embodiment, and is a system configuration diagram illustrating a vehicle interior cooling battery cooling mode. FIG. 8 relates to the vehicle heat management system of the embodiment, and is a system configuration diagram for explaining the vehicle interior heating battery cooling mode.

Hereinafter, embodiments embodying the present invention will be described with reference to the drawings. The vehicle thermal management system of the embodiment is mounted on a battery-equipped vehicle that obtains driving force for running from an electric motor. Examples of battery-equipped vehicles include electric vehicles and plug-in hybrid vehicles. The vehicle thermal management system of the embodiment performs air conditioning in the vehicle interior, temperature control of the vehicle battery, and cooling of the vehicle electrical components.

(Example)
As schematically shown in FIG. 1, the vehicle heat management system includes a first refrigerant circuit 1, a cooling water circuit 2, a second refrigerant circuit 3, and a first refrigerant/cooling water heat exchanger. 4 , a second refrigerant/cooling water heat exchanger 5 , and a control unit 6 .

The first refrigerant/cooling water heat exchanger 4 is incorporated in both the first refrigerant circuit 1 and the cooling water circuit 2 to connect the first refrigerant circuit 1 and the cooling water circuit 2 . The second refrigerant/cooling water heat exchanger 5 is incorporated in both the cooling water circuit 2 and the second refrigerant circuit 3 to connect the cooling water circuit 2 and the second refrigerant circuit 3 .

The first refrigerant circuit 1 air-conditions the interior of the vehicle by heat exchange between the first refrigerant R1 circulating in the circuit and the interior air sent into the interior of the vehicle. Further, the first refrigerant circuit 1 absorbs heat from the cooling water L by heat exchange between the first refrigerant R1 circulating in the circuit and the cooling water L of the cooling water circuit 2 to cool the cooling water L, or Heat is radiated to L to heat the cooling water L.

The first refrigerant circuit 1 includes a cooling water heating circuit that cools the vehicle interior by cooling the indoor air and heats the vehicle interior to the cooling water L, and a cooling water heating circuit that heats the vehicle interior by heating the indoor air and absorbs heat from the cooling water L. It is configured to be switchable to a vehicle interior heating cooling water cooling circuit. Cooling the vehicle interior by cooling the indoor air also includes dehumidifying the vehicle interior.

The first refrigerant circuit 1 includes a first refrigerant line 1a, a first refrigerant/internal air heat exchanger bypass line 1b as a first refrigerant/internal air heat exchanger bypass, and an internal air cooler bypass as an internal air cooler bypass. and a pipeline 1c.

The first refrigerant circuit 1 includes a first compressor 10, a first three-way valve 11, a first refrigerant/inside air heat exchanger 12, a third expansion valve 13, a second three-way valve 14, and a first expansion valve. 15 and an internal air cooler 16, which are arranged in this order in the first refrigerant pipe line 1a. A first refrigerant/cooling water heat exchanger 4 is incorporated between the third expansion valve 13 and the second three-way valve 14 .

The first compressor 10 and a second compressor 30 to be described later are electric compressors whose refrigerant discharge capacity is controlled by a control signal output from the control unit 6 . The first compressor 10 compresses the first refrigerant R<b>1 and circulates it through the first refrigerant circuit 1 . The circulation direction of the first refrigerant R1 in the first refrigerant circuit 1 is the counterclockwise direction in FIG. That is, the first refrigerant R<b>1 compressed by the first compressor 10 goes to the first three-way valve 11 .

One end of the first refrigerant/inside air heat exchanger bypass line 1b is connected to the first three-way valve 11, and the other end of the first refrigerant/internal air heat exchanger bypass line 1b is connected to the third expansion valve 13 and the first refrigerant/ It is connected to the first connecting portion 1d of the first refrigerant pipe line 1a located between the cooling water heat exchanger 4 and the cooling water heat exchanger 4 . The first refrigerant/inside air heat exchanger bypass line 1 b bypasses the first refrigerant/inside air heat exchanger 12 and the third expansion valve 13 . One end of the internal air cooler bypass line 1c is connected to the second three-way valve 14, and the other end of the internal air cooler bypass line 1c is the first refrigerant pipe located between the internal air cooler 16 and the first compressor 10. It is connected to the second connection portion 1e of the path 1a. The internal air cooler bypass line 1 c bypasses the internal air cooler 16 and the first expansion valve 15 .

The first three-way valve 11 and the second three-way valve 14, as well as a third three-way valve 33, a fourth three-way valve 35, a fifth three-way valve 36 and a sixth three-way valve 39, which will be described later, are operated according to control signals from the control unit 6. It is an electric three-way valve that switches the pipeline through which the refrigerant flows.

The first three-way valve 11 switches between flowing the first refrigerant R1 to the side of the first refrigerant/inside air heat exchanger 12 and the third expansion valve 13, or to the side of the first refrigerant/inside air heat exchanger bypass line 1b. This is the first refrigerant/inside air heat exchanger bypass switching section. The second three-way valve 14 is an inside air cooler bypass switching unit that switches between flowing the first refrigerant R1 to the inside air cooler 16 and first expansion valve 15 side or to the inside air cooler bypass line 1c side.

In the first refrigerant circuit 1, heat is exchanged between the first refrigerant R1 and indoor air sent into the vehicle compartment by a blower fan (not shown) in the first refrigerant/internal air heat exchanger 12 and the internal air cooler 16. When the first refrigerant/internal air heat exchanger 12 functions as the condenser of the first refrigerant circuit 1 , the first refrigerant R1 releases heat to the indoor air in the first refrigerant/internal air heat exchanger 12 . The indoor air heated by heat exchange with the first refrigerant R1 is sent into the passenger compartment by a blower fan (not shown) to heat the passenger compartment. When the first refrigerant R1 passes through the first refrigerant/internal air heat exchanger bypass line 1b, the function of the first refrigerant/inside air heat exchanger 12 is stopped. When the internal air cooler 16 functions as an evaporator of the first refrigerant circuit 1 , the internal air cooler 16 absorbs heat from the indoor air to the first refrigerant R1. The indoor air cooled by heat exchange with the first refrigerant R1 is sent into the passenger compartment by a blower fan (not shown) to cool the passenger compartment. When the first refrigerant R1 passes through the internal air cooler bypass line 1c, the function of the internal air cooler 16 is stopped.

The cooling water circuit 2 cools the vehicle-mounted electrical components by heat exchange between the cooling water L circulating in the circuit and the vehicle-mounted electrical components. The cooling water circuit 2 absorbs heat from the outside air to heat the cooling water or releases heat to the outside air to cool the cooling water by heat exchange between the cooling water L circulating in the circuit and the outside air. In the cooling water circuit 2, the heat exchange between the cooling water L circulating in the circuit and the outside air is controlled, so that the heat dissipation from the cooling water L to the outside air and the heat absorption from the outside air to the cooling water L are controlled. The cooling water circuit 2 is configured to be switchable between a heat radiation circuit in which the cooling water L releases heat to the outside air and a non-heat radiation circuit in which the cooling water L does not release heat to the outside air. It should be noted that the non-radiating circuit includes that the cooling water L does not radiate heat to the outside air, but absorbs heat from the outside air to the cooling water L.

The cooling water circuit 2 has a cooling water pipeline 2a. In the cooling water circuit 2, cooling water L circulates in the circuit to cool the vehicle-mounted electrical components. Examples of in-vehicle electrical components include a motor for driving a vehicle, a PCU, and the like.

The cooling water circuit 2 includes a water pump 20, an electric component 21, and a radiator 22, which are arranged in the cooling water pipe 2a in this order. The cooling water pipe 2a is connected to a cooling channel built in or adjacent to the on-vehicle electrical component, and the cooling water L flows through the cooling channel of the on-vehicle electrical component in the electrical component 21 to cool the on-vehicle electrical component. do.

In the cooling water circuit 2, the first refrigerant/coolant heat exchanger 4 is installed between the electrical component 21 and the radiator 22, and the second refrigerant/coolant heat exchanger 5 is installed between the radiator 22 and the water pump 20. embedded between. The circulation direction of the cooling water L in the cooling water circuit 2 is the counterclockwise direction in FIG. That is, the cooling water L pressure-fed by the water pump 20 is directed to the electrical component 21 and reaches the radiator 22 via the first refrigerant/cooling water heat exchanger 4 . Cooling water in this specification includes so-called coolant (LLC: Long Life Coolant).

A cooling fan 23 that blows outside air to the radiator 22 is provided near the radiator 22 . In the cooling water circuit 2 , heat is exchanged between the outside air sent by the cooling fan 23 and the cooling water L in the radiator 22 . If the cooling fan 23 is stopped, the cooling water L does not substantially exchange heat with the outside air. The cooling water circuit 2 serves as a heat dissipation circuit in which the cooling water L releases heat to the outside air when the cooling fan 23 is operating or when the vehicle is running. It becomes a non-heat-dissipating circuit that does not need to be replaced.

The second refrigerant circuit 3 controls the temperature of the vehicle battery by heat exchange between the second refrigerant R2 circulating in the circuit and the vehicle battery. The second refrigerant circuit 3 cools the cooling water L by absorbing heat from the cooling water L through heat exchange between the second refrigerant R2 circulating in the circuit and the cooling water L of the cooling water circuit 2 . The second refrigerant circuit 3 includes a cooling water cooling circuit that cools the cooling water L without adjusting the temperature of the vehicle-mounted battery, a battery warming circuit that absorbs heat from the outside air and warms up the vehicle-mounted battery, and a circuit that dissipates heat to the outside air. It is configured to be switchable to a battery cooling circuit that cools the on-vehicle battery.

The second refrigerant circuit 3 has a second refrigerant line 3a, a battery heat exchanger bypass line 3b, and a second refrigerant/cooling water heat exchanger bypass line 3c.

The second refrigerant circuit 3 includes a second compressor 30, a four-way valve 31, a second refrigerant/outside air heat exchanger 32, a third three-way valve 33, a second expansion valve 34, and a fourth three-way valve 35. , a fifth three-way valve 36, a fourth expansion valve 37, a battery heat exchanger 38, and a sixth three-way valve 39, which are arranged in this order in the second refrigerant line 3a. A second refrigerant/cooling water heat exchanger 5 is incorporated between the second expansion valve 34 and the fourth three-way valve 35 .

The second compressor 30 compresses the second refrigerant R2 and circulates it through the second refrigerant circuit 3 . The circulation direction of the second refrigerant R2 in the second refrigerant circuit 3 is reversed by the four-way valve 31, and the second refrigerant R2 circulates clockwise and counterclockwise in FIG.

The four-way valve 31 is an electric four-way valve that switches between a first state and a second state according to a control signal from the control unit 6, and reverses the direction in which the second refrigerant R2 circulates in the second refrigerant pipe 3. It is a direction switching part.

The four-way valve 31 in the first state connects the suction side of the second compressor 30 to the battery heat exchanger 38 side and connects the discharge side of the second compressor 30 to the second refrigerant/outside air heat exchanger 32 side. do. If the four-way valve 31 is in the first state, the direction of circulation of the second refrigerant R2 in the second refrigerant circuit 3 is clockwise in FIG. 2 toward the refrigerant/outside air heat exchanger 32 side. The four-way valve 31 in the second state connects the suction side of the second compressor 30 to the second refrigerant/outside air heat exchanger 32 side, and connects the discharge side of the second compressor 30 to the battery heat exchanger 38 side. do. When the four-way valve 31 is in the second state, the circulation direction of the second refrigerant R2 in the second refrigerant circuit 3 is counterclockwise in FIG. It goes to the battery heat exchanger 38 side.

One end of the battery heat exchanger bypass line 3 b is connected to the fifth three-way valve 36 , and the other end of the battery heat exchanger bypass line 3 b is connected to the sixth three-way valve 39 . The battery heat exchanger bypass line 3 b is a battery heat exchanger bypass that bypasses the battery heat exchanger 38 and the fourth expansion valve 37 . One end of the second refrigerant/cooling water heat exchanger bypass line 3c is connected to the third three-way valve 33, and the other end of the second refrigerant/cooling water heat exchanger bypass line 3c is connected to the fourth three-way valve 35. ing. The second refrigerant/coolant heat exchanger bypass line 3 c is a second refrigerant/coolant heat exchanger bypass that bypasses the second refrigerant/coolant heat exchanger 5 and the second expansion valve 34 .

The fifth three-way valve 36 and the sixth three-way valve 39 switch the flow of the second refrigerant R2 to the side of the battery heat exchanger 38 and the fourth expansion valve 37 or to the side of the battery heat exchanger bypass pipe 3b. Exchanger bypass. The third three-way valve 33 and the fourth three-way valve 35 flow the second refrigerant R2 to the side of the second refrigerant/cooling water heat exchanger 5 and the second expansion valve 34, or the second refrigerant/cooling water heat exchanger bypass pipe. It is a second refrigerant/cooling water heat exchanger bypass switching unit that switches whether to flow to the path 3c side.

In the second refrigerant circuit 3 , heat is exchanged between the second refrigerant R<b>2 and the vehicle-mounted battery in the battery heat exchanger 38 . When the battery heat exchanger 38 functions as an evaporator of the second refrigerant circuit 3, the second refrigerant R2 absorbs heat from the vehicle battery in the battery heat exchanger 38 to cool the vehicle battery. When the battery heat exchanger 38 functions as a condenser for the second refrigerant circuit 3, the second refrigerant R2 releases heat to the vehicle battery in the battery heat exchanger 38 to warm the vehicle battery. When the second refrigerant R2 passes through the battery heat exchanger bypass line 3b, the function of the battery heat exchanger 33 stops.

The second refrigerant pipe 3a is connected to a temperature control passage built in or adjacent to the vehicle battery. Adjust the temperature.

In the second refrigerant circuit 3, the second refrigerant/outside air heat exchanger 32 exchanges heat between the second refrigerant R2 and the outside air sent outside by a blower fan (not shown). When the second refrigerant/outside air heat exchanger 32 functions as an evaporator of the second refrigerant circuit 3 , the second refrigerant R2 absorbs heat from the outside air in the second refrigerant/outside air heat exchanger 32 . When the second refrigerant/outside air heat exchanger 32 functions as a condenser of the second refrigerant circuit 3 , the second refrigerant R2 releases heat to the outside air in the second refrigerant/outside air heat exchanger 32 .

In the first refrigerant/cooling water heat exchanger 4, the first refrigerant R1 circulating in the first refrigerant circuit 1 and the cooling water L circulating in the cooling water circuit 2 exchange heat. When the first refrigerant/cooling water heat exchanger 4 functions as a condenser of the first refrigerant circuit 1 , the first refrigerant R1 releases heat to the cooling water L in the first refrigerant/cooling water heat exchanger 4 . When the first refrigerant/cooling water heat exchanger 4 functions as an evaporator of the first refrigerant circuit 1 , the first refrigerant R1 absorbs heat from the cooling water L in the first refrigerant/cooling water heat exchanger 4 .

In the second refrigerant/cooling water heat exchanger 5, the second refrigerant R2 circulating in the second refrigerant circuit 3 and the cooling water L circulating in the cooling water circuit 2 exchange heat. When the second refrigerant/cooling water heat exchanger 5 functions as an evaporator of the second refrigerant circuit 3 , the second refrigerant R<b>2 absorbs heat from the cooling water L in the second refrigerant/cooling water heat exchanger 5 . When the second refrigerant R2 passes through the second refrigerant/cooling water heat exchanger bypass line 3c, the function of the second refrigerant/cooling water heat exchanger 5 is stopped.

The control unit 6 is composed of an electronic control device and controls the operations of the first refrigerant circuit 1 , the cooling water circuit 2 and the second refrigerant circuit 3 .

The control unit 6 controls the operations of the first compressor 10 , the first three-way valve 11 , the second three-way valve 14 and the blower fan (not shown) in the first refrigerant circuit 1 . The control unit 6 controls operations of the water pump 20 and the cooling fan 23 in the cooling water circuit 2 . In the second refrigerant circuit 3, the control unit 6 controls the second compressor 30, the four-way valve 31, the third three-way valve 33, the fourth three-way valve 35, the fifth three-way valve 36, the sixth three-way valve 39, and the blower fan (not shown). controls the operation of

The first refrigerant circuit 1 is switched between the first normal mode and the first stop mode under the control of the controller 6 . In the first normal mode, the first three-way valve 11 is controlled by the controller 6 so that the first refrigerant R1 flows through the first refrigerant/inside air heat exchanger 12 and the third expansion valve 13 side. In the first stop mode, the first three-way valve 11 is controlled by the controller 6 so that the first refrigerant R1 flows through the first refrigerant/inside air heat exchanger bypass pipe line 1b side.

The first refrigerant circuit 1 is switched between the second normal mode and the second stop mode under the control of the controller 6 . In the second normal mode, the control unit 6 controls the second three-way valve 14 so that the first refrigerant R1 flows through the inside air cooler 16 and the first expansion valve 15 side. In the second stop mode, the control unit 6 controls the second three-way valve 14 so that the first refrigerant R1 flows through the internal air cooler bypass pipe line 1c.

The second refrigerant circuit 3 is switched between the third normal mode and the third stop mode under the control of the controller 6 . In the third normal mode, the control unit 6 controls the fifth three-way valve 36 and the sixth three-way valve 39 so that the second refrigerant R2 flows through the battery heat exchanger 38 and the fourth expansion valve 37 side. In the third stop mode, the control unit 6 controls the fifth three-way valve 36 and the sixth three-way valve 39 so that the second refrigerant R2 flows through the battery heat exchanger bypass pipe 3b.

The second refrigerant circuit 3 is switched between the fourth normal mode and the fourth stop mode under the control of the controller 6 . In the fourth normal mode, the control unit 6 controls the third three-way valve 33 and the fourth three-way valve 35 so that the second refrigerant R2 flows through the second refrigerant/cooling water heat exchanger 5 and the second expansion valve 34 side. In the fourth stop mode, the control unit 6 controls the third three-way valve 33 and the fourth three-way valve 35 so that the second refrigerant R2 flows through the second refrigerant/cooling water heat exchanger bypass pipe 3c.

The operation of the vehicle heat management system of this embodiment having the above configuration will be described below.
(Vehicle interior cooling water cooling mode)
The first refrigerant circuit 1, the cooling water circuit 2, and the second refrigerant circuit 3 are controlled by the control unit 6 to operate in the vehicle interior cooling water cooling mode, the system configuration of which is shown in FIG. In the vehicle interior cooling water cooling mode, the first refrigerant circuit 1 for air-conditioning the interior of the vehicle operates to cool the interior of the vehicle, and the second refrigerant circuit 3 for adjusting the temperature of the vehicle battery cools the cooling water circuit 2. It operates to cool the water L.

In the vehicle interior cooling water cooling mode, operation is performed in a first stop mode, a second normal mode, a third stop mode, and a fourth normal mode.

The second refrigerant circuit 3 in the vehicle interior cooling water cooling mode forms a cooling water cooling circuit, and cools the cooling water L of the cooling water circuit 2 without adjusting the temperature of the onboard battery. In the second refrigerant circuit 3 in the vehicle interior cooling water cooling mode, the four-way valve 31 is controlled so that the circulation direction of the second refrigerant R2 is the clockwise direction in FIG. The refrigerant R2 goes toward the second refrigerant/outside air heat exchanger 32 side. In addition, the second refrigerant circuit 3 in the vehicle interior cooling water cooling mode operates in the third stop mode and the fourth normal mode.

In the second refrigerant circuit 3 that operates in the third stop mode and the fourth normal mode in the passenger compartment cooling water cooling mode, the second refrigerant R2 compressed by the second compressor 30 passes through the four-way valve 31 to the second refrigerant circuit 3. 2 into a refrigerant/outside air heat exchanger 32 . The second refrigerant/outside air heat exchanger 32 functions as a condenser of the second refrigerant circuit 3 , and the second refrigerant R2 releases heat to the outside air in the second refrigerant/outside air heat exchanger 32 . After heat release, the second refrigerant R2 is depressurized by the second expansion valve 34 and introduced into the second refrigerant/cooling water heat exchanger 5 . The second refrigerant/cooling water heat exchanger 5 functions as an evaporator of the second refrigerant circuit 3, and the second refrigerant R2 absorbs heat from the cooling water L of the cooling water circuit 2 in the second refrigerant/cooling water heat exchanger 5. Then, the cooling water L is cooled. After absorbing heat, the second refrigerant R2 passes through the battery heat exchanger bypass line 3b and is introduced into the second compressor 30 via the four-way valve 31. As shown in FIG.

The first refrigerant circuit 1 in the vehicle interior cooling water cooling mode forms a cooling water heating circuit, cools the interior air by cooling the vehicle interior, and radiates heat to the cooling water L of the cooling water circuit 2 . The first refrigerant circuit 1 in the passenger compartment cooling water cooling mode operates in the first stop mode and the second normal mode.

In the first refrigerant circuit 1 operated in the first stop mode and the second normal mode in the passenger compartment cooling water cooling mode, the first refrigerant R1 compressed by the first compressor 10 is transferred to the first refrigerant/inside air heat exchanger It is introduced into the first refrigerant/cooling water heat exchanger 4 through the bypass line 1b. The first refrigerant/cooling water heat exchanger 4 functions as a condenser of the first refrigerant circuit 1, and the first refrigerant R1 releases heat to the cooling water L of the cooling water circuit 2 in the first refrigerant/cooling water heat exchanger 4. do. After heat release, the first refrigerant R1 is decompressed by the first expansion valve 15 and introduced into the internal air cooler 16 . The inside air cooler 16 functions as an evaporator of the first refrigerant circuit 1, and the first refrigerant R1 absorbs heat from the indoor air in the inside air cooler 16 to cool the vehicle interior. The first refrigerant R1 after absorbing heat is introduced into the first compressor 10 .

The cooling water circuit 2 in the vehicle interior cooling water cooling mode forms a heat dissipation circuit in which the cooling fan 23 operates, and the cooling water L radiates heat to the outside air through the radiator 22 .

In the cooling water circuit 2 in the vehicle interior cooling water cooling mode, the cooling water L pressure-fed by the water pump 20 absorbs heat from the electrical components 21, and in the first refrigerant/cooling water heat exchanger 4, the first refrigerant circuit 1 absorbs heat from the first refrigerant R1. After absorbing heat, the cooling water L radiates heat to the outside air through the radiator 22 and radiates heat to the second refrigerant R2 of the second cooling circuit 3 through the second refrigerant/cooling water heat exchanger 5 . The electric component 21 can be appropriately cooled by the cooling water L that has been cooled by the radiator 22 radiating heat to the outside air and the second refrigerant/cooling water heat exchanger 5 radiating heat to the second refrigerant R2.

In the cooling water circuit 2 in the vehicle interior cooling water cooling mode, the first refrigerant/cooling water heat exchanger 4 absorbs heat from the first refrigerant R1, absorbs heat from the electrical component 21, and radiates heat to the outside air through the radiator 22. The cooling water L is cooled according to the cooling capacity of the second refrigerant circuit 3 by dissipating heat to the second refrigerant R2 in the second refrigerant/cooling water heat exchanger 5, so that the temperature of the cooling water L is appropriate. cooled to The temperature of the cooling water L in this vehicle interior cooling cooling water cooling mode is preferably in the range of 0 to 40.degree.

The control unit 6 executes the vehicle interior cooling water cooling mode when the temperature of the cooling water L in the cooling water circuit 2 exceeds a predetermined range (for example, the range of 0 to 40 ° C.), and the temperature of the cooling water L If it is within the predetermined range, it is preferable not to execute the vehicle interior cooling water cooling mode. By not operating the second compressor 30 of the second refrigerant circuit 3, power consumption of the second compressor 30 can be omitted. In this case, cooling of the cooling water L in the cooling water circuit 2 may be performed only by the radiator 22 .

Thus, in the passenger compartment cooling water cooling mode, the cooling water L in the cooling water circuit 2 can be cooled by the second refrigerant circuit 3 while the inside of the passenger compartment is cooled by the first refrigerant circuit 1 . Therefore, it is possible to cool the cooling water L of the cooling water circuit 2 in accordance with the cooling capacity of the second refrigerant circuit 3 while cooling the vehicle interior even in hot summer weather, thereby appropriately cooling the electric parts 21. can be done.

On the other hand, this vehicle heat management system can cool the onboard battery according to the cooling capacity of the second refrigerant circuit 3 by operating the second refrigerant circuit 3 in the battery cooling mode as will be described later. Appropriate cooling of the on-vehicle battery becomes possible.

Therefore, according to this vehicle heat management system, in a battery-equipped vehicle, it is possible to appropriately cool the on-board battery and air-condition the vehicle interior. It can be lowered to properly cool the electrical component 21 .

(Vehicle interior cooling mode)
Under the control of the controller 6, the first refrigerant circuit 1 and the cooling water circuit 2 operate in a vehicle interior cooling mode, the system configuration of which is shown in FIG. In the passenger compartment cooling mode, the engine is operated in the first stop mode and the second normal mode.

The first refrigerant circuit 1 in the vehicle interior cooling mode forms a cooling water heating circuit, and operates in the first stop mode and the second normal mode, as in the vehicle interior cooling water cooling mode. The first refrigerant R1 circulating in the first refrigerant circuit 1 releases heat to the cooling water L of the cooling water circuit 2 in the first refrigerant/cooling water heat exchanger 4, and absorbs heat from the room air in the inside air cooler 16. to cool the passenger compartment.

The cooling water circuit 2 in the vehicle interior cooling mode forms a heat radiation circuit in which the cooling fan 23 operates as in the vehicle interior cooling water cooling mode. The cooling water L circulating in the cooling water circuit 2 absorbs heat from the electric component 21 , absorbs heat from the first refrigerant R<b>1 in the first refrigerant/cooling water heat exchanger 4 , and radiates heat to the outside air in the radiator 22 . Excessive temperature rise of the cooling water L in the cooling water circuit 2 can be suppressed by heat radiation to the outside air in the radiator 22 .

The cooling water L passes through the second refrigerant/cooling water heat exchanger 5, but in the second refrigerant circuit 3, the second compressor 30 is not operating and the second refrigerant R2 is circulating through the second refrigerant circuit 3. or, even if the second compressor 30 is operating, the second refrigerant R2 passes through the second refrigerant/cooling water heat exchanger bypass pipe 3c and the function of the second refrigerant/cooling water heat exchanger 5 is disabled. If it is stopped, the cooling water L in the second refrigerant/cooling water heat exchanger 5 does not substantially release heat to or absorb heat from the second refrigerant R2 of the second refrigerant circuit 3 . This also applies to the vehicle interior heating mode, the vehicle interior cooling battery cooling mode, and the vehicle interior heating battery cooling mode, which will be described later.

Thus, in the passenger compartment cooling mode, the cooling water circuit 2 releases heat from the cooling water L to the outside air, while the first refrigerant circuit 1 effectively cools the passenger compartment in accordance with the cooling capacity of the first refrigerant circuit 1. can.

(Vehicle heating mode)
Under the control of the controller 6, the first refrigerant circuit 1 and the cooling water circuit 2 operate in the vehicle interior heating mode, the system configuration of which is shown in FIG. The first refrigerant circuit 1 in the vehicle interior heating mode constitutes a heating cooling water cooling circuit, and operates in the first normal mode and the second stop mode.

In the first refrigerant circuit 1 operated in the first normal mode and the second stop mode in the vehicle interior heating mode, the first refrigerant R1 compressed by the first compressor 10 is introduced into the first refrigerant/inside air heat exchanger 12. be done. The first refrigerant/internal air heat exchanger 12 functions as a condenser of the first refrigerant circuit 1, and the first refrigerant R1 releases heat to the indoor air in the first refrigerant/internal air heat exchanger 12 to heat the vehicle interior. . After heat release, the first refrigerant R1 is decompressed by the third expansion valve 13 and introduced into the first refrigerant/cooling water heat exchanger 4 . The first refrigerant/cooling water heat exchanger 4 functions as an evaporator of the first refrigerant circuit 1, and the first refrigerant R1 absorbs heat from the cooling water L of the cooling water circuit 2 in the first refrigerant/cooling water heat exchanger 4. do. After absorbing heat, the first refrigerant R1 is introduced into the first compressor 10 through the internal air cooler bypass line 1c.

The cooling water circuit 2 in the vehicle interior heating mode forms a non-radiating circuit in which the cooling fan 23 is stopped, and the radiator 22 does not radiate heat from the cooling water L to the outside air.

In the cooling water circuit 2 in the vehicle interior heating mode, the cooling water L pumped by the water pump 20 passes through the electric component 21 and the first refrigerant/cooling water heat exchanger 4, passes through the radiator 22, and heats the second refrigerant/cooling water. It is introduced into the water pump 20 via the exchanger 5 . The cooling water L circulating in the cooling water circuit 2 absorbs heat from the electrical components 21 to cool the electrical components 21, and the first coolant R1 of the first coolant circuit 1 in the first coolant/cooling water heat exchanger 4. to dissipate heat. By dissipating heat to the first refrigerant R1 in the first refrigerant/cooling water heat exchanger 4, it is possible to prevent the cooling water L in the cooling water circuit 2 from becoming excessively hot. When the temperature of the outside air is higher than the temperature of the cooling water L in the vehicle interior heating mode, the cooling water circuit 2 forms a non-radiating circuit, and the radiator 22 absorbs heat from the outside air to the cooling water L. good. The cooling water L circulating in the cooling water circuit 2 absorbs heat from the electrical components 21 to cool the electrical components 21, absorbs heat from the outside air at the radiator 22, and further flows through the first refrigerant/cooling water heat exchanger 4 into the first heat exchanger. Heat is radiated to the refrigerant R1. As a result, the cooling water L in the cooling water circuit 2 can be prevented from becoming excessively low temperature.

In the cooling water circuit 2 in the vehicle interior heating mode, the cooling fan 23 is operated as necessary, such as when it is desired to prioritize the cooling of the electrical parts 21, and the cooling water L is transferred from the cooling water L to the outside air by the radiator 22. heat dissipation may be performed. This also applies to the vehicle interior heating battery cooling mode, which will be described later.

In this manner, in the passenger compartment heating mode, the first refrigerant R1 in the first refrigerant circuit 1 is effectively heated by using the exhaust heat of the electrical parts 21 that has absorbed heat from the electrical parts 21 in the cooling water circuit 2 as a heat source, thereby effectively heating the passenger compartment. can be heated to

(battery cooling mode)
The second refrigerant circuit 3 is controlled by the control unit 6 to operate in a battery cooling mode, the system configuration of which is shown in FIG. The second refrigerant circuit 3 in the battery cooling mode forms a battery cooling circuit, radiates heat to the outside air, and cools the onboard battery.

In the second refrigerant circuit 3 in the battery cooling mode, the second refrigerant R2 compressed by the second compressor 30 is directed toward the second refrigerant/outside air heat exchanger 32 by controlling the four-way valve 31. The circulation direction of R2 is controlled, and the second refrigerant R2 circulates in the clockwise direction in FIG. In the battery cooling mode, the second refrigerant circuit 3 operates in the third normal mode and the fourth stop mode.

In the battery cooling mode, the second refrigerant R2 circulates in the clockwise direction in FIG. The second refrigerant R2 is introduced into the second refrigerant/outside air heat exchanger 32 via the four-way valve 31 . The second refrigerant/outside air heat exchanger 32 functions as a condenser of the second refrigerant circuit 3 , and the second refrigerant R2 releases heat to the outside air in the second refrigerant/outside air heat exchanger 32 . After the heat is released, the second refrigerant R2 is introduced into the fourth expansion valve 37 through the second refrigerant/cooling water heat exchanger bypass pipe 3c. The second refrigerant R<b>2 decompressed by the fourth expansion valve 37 is introduced into the battery heat exchanger 38 . The battery heat exchanger 38 functions as an evaporator of the second refrigerant circuit 3, and the second refrigerant R2 absorbs heat from the vehicle battery in the battery heat exchanger 38 to cool the vehicle battery. The second refrigerant R<b>2 after absorbing heat is introduced into the second compressor 30 via the four-way valve 31 .

In this way, the second refrigerant circuit 3 that operates independently can effectively cool the vehicle-mounted battery in accordance with the cooling capacity of the second refrigerant circuit 3 .

(battery warm-up mode)
The second refrigerant circuit 3 is controlled by the control unit 6 to operate in a battery warm-up mode, the system configuration of which is shown in FIG. The second refrigerant circuit 3 in the battery warm-up mode forms a battery warm-up circuit, absorbs heat from the outside air, and warms up the vehicle battery.

In the second refrigerant circuit 3 in the battery warm-up mode, the four-way valve 31 is controlled to circulate the second refrigerant R2 so that the second refrigerant R2 compressed by the second compressor 30 is directed toward the battery heat exchanger 38 side. The direction is controlled, and the second refrigerant R2 circulates in the counterclockwise direction in FIG. 6 through the second refrigerant circuit 3 . In the battery warm-up mode, the second refrigerant circuit 3 operates in the third normal mode and the fourth stop mode.

In the battery warm-up mode, the second refrigerant R2 circulates in the counterclockwise direction of FIG. The second refrigerant R2 thus obtained is introduced into the battery heat exchanger 38 via the four-way valve 31 . The battery heat exchanger 38 functions as a condenser of the second refrigerant circuit 3. In the battery heat exchanger 38, the second refrigerant R2 dissipates heat to the onboard battery to warm up the onboard battery. After the heat is released, the second refrigerant R2 is decompressed by the fourth expansion valve 37 and introduced into the second refrigerant/outside air heat exchanger 32 through the second refrigerant/cooling water heat exchanger bypass line 3c. The second refrigerant/outside air heat exchanger 32 functions as an evaporator of the second refrigerant circuit 3, and the second refrigerant R2 absorbs heat from the outside air in the second refrigerant/outside air heat exchanger 32. The second refrigerant R<b>2 after absorbing heat is introduced into the second compressor 30 via the four-way valve 31 .

With the second refrigerant circuit 3 operating independently in this manner, the on-vehicle battery can be effectively warmed up according to the heating capacity of the second refrigerant circuit 3 .

(In-vehicle cooling battery cooling mode)
The first refrigerant circuit 1, the cooling water circuit 2, and the second refrigerant circuit 3 are controlled by the control unit 6 to operate in the vehicle interior cooling battery cooling mode, the system configuration of which is shown in FIG. In the passenger compartment cooling battery cooling mode, the vehicle is operated in the first stop mode, the second normal mode, the third normal mode, and the fourth stop mode.

The first refrigerant circuit 1 in the vehicle interior cooling battery cooling mode forms a cooling water heating circuit in the same manner as in the vehicle interior cooling water cooling mode and vehicle interior cooling mode, and operates in the first stop mode and the second normal mode. . The first refrigerant R1 circulating in the first refrigerant circuit 1 radiates heat to the cooling water L in the first refrigerant/cooling water heat exchanger 4, and absorbs heat from the indoor air in the inside air cooler 16 to flow in the vehicle interior. Cool down.

The cooling water circuit 2 in the vehicle interior cooling battery cooling mode forms a heat radiation circuit in which the cooling fan 23 operates, as in the vehicle interior cooling water cooling mode and the vehicle interior cooling mode. The cooling water L circulating in the cooling water circuit 2 absorbs heat from the electrical components 21 to cool the electrical components 21, absorbs heat from the first coolant R1 in the first coolant/cooling water heat exchanger 4, and heats the radiator. At 22, the heat is radiated to the outside air.

As in the battery cooling mode, the second refrigerant circuit 3 in the vehicle interior cooling battery cooling mode forms a battery cooling circuit, and the second refrigerant R2 circulates through the second refrigerant circuit 3 in the clockwise direction in FIG. 3 Operate in the normal mode and the fourth stop mode. The second refrigerant R2 circulating in the second refrigerant circuit 3 releases heat to the outside air in the second refrigerant/outside air heat exchanger 32, and absorbs heat from the vehicle battery in the battery heat exchanger 38 to cool the vehicle battery. .

Thus, in the vehicle interior cooling battery cooling mode, the cooling water circuit 2 radiates heat from the cooling water L to the outside air, while the first refrigerant circuit 1 effectively cools the vehicle interior according to the cooling capacity of the first refrigerant circuit 1. be able to. In addition, the vehicle-mounted battery can be effectively cooled by the second refrigerant circuit 3 according to the cooling capacity of the second refrigerant circuit 3 .

(In-vehicle heating battery cooling mode)
The first refrigerant circuit 1, the cooling water circuit 2, and the second refrigerant circuit 3 are controlled by the controller 6 to operate in the vehicle interior heating battery cooling mode, the system configuration of which is shown in FIG. In the vehicle interior heating battery cooling mode, operation is performed in a first normal mode, a second stop mode, a third normal mode, and a fourth stop mode.

The first refrigerant circuit 1 in the vehicle interior heating battery cooling mode forms a heating cooling water cooling circuit as in the vehicle interior heating mode, and operates in the first normal mode and the second stop mode. The first refrigerant R1 circulating in the first refrigerant circuit 1 heats the vehicle interior by radiating heat to the indoor air in the first refrigerant/inside air heat exchanger 12, and the first refrigerant/cooling water heat exchanger 4 absorbs heat from the cooling water L.

The cooling water circuit 2 in the vehicle interior heating battery cooling mode forms a non-radiating circuit in which the cooling fan 23 is stopped, as in the vehicle interior heating mode. The cooling water L circulating in the cooling water circuit 2 absorbs heat from the electrical components 21 to cool the electrical components 21 , and radiates heat to the first coolant R<b>1 in the first coolant/cooling water heat exchanger 4 . When the temperature of the outside air is higher than the temperature of the cooling water L in the vehicle interior heating battery cooling mode, the cooling water circuit 2 forms a non-radiating circuit, and the radiator 22 absorbs heat from the outside air to the cooling water L. can be The cooling water L circulating in the cooling water circuit 2 absorbs heat from the electrical components 21 to cool the electrical components 21, absorbs heat from outside air at the radiator 22, and further flows through the first refrigerant/cooling water heat exchanger 4 into the first heat exchanger. Heat is radiated to the refrigerant R1. As a result, it is possible to prevent the cooling water L in the cooling water circuit 2 from becoming excessively low temperature.

The second refrigerant circuit 3 in the vehicle interior heating battery cooling mode forms a battery cooling circuit as in the battery cooling mode, the second refrigerant R2 circulates through the second refrigerant circuit 3 in the clockwise direction in FIG. 3 Operate in the normal mode and the fourth stop mode. The second refrigerant R2 circulating in the second refrigerant circuit 3 radiates heat to the outside air in the second refrigerant/outside air heat exchanger 32, and absorbs heat from the vehicle battery in the battery heat exchanger 38 to cool the vehicle battery. .

Thus, in the vehicle interior heating battery cooling mode, the first refrigerant R1 in the first refrigerant circuit 1 is effectively heated by using the exhaust heat of the electrical components 21 that has absorbed heat from the electrical components 21 in the cooling water circuit 2 as a heat source, and the vehicle interior is heated. can be effectively heated. In addition, the second refrigerant circuit 3 can effectively cool the vehicle-mounted battery according to the cooling capacity of the second refrigerant circuit 3 .

Although the present invention has been described above with reference to the embodiments, it goes without saying that the present invention is not limited to the above embodiments, and can be modified and applied without departing from the scope of the invention.

For example, in the above-described embodiment, in the first refrigerant circuit 1, the first stop mode is set by flowing the first refrigerant R1 to the first refrigerant/inside air heat exchanger bypass pipe line 1b side. is not limited to For example, the first refrigerant R1 is flowed not to the first refrigerant/inside air heat exchanger bypass pipe 1b side but to the first refrigerant pipe 1a side where the first refrigerant/inside air heat exchanger 12 is located, and the third expansion valve 13 The first stop mode may be achieved by stopping the expansion and bypassing the indoor air side so that the indoor air does not pass through the first refrigerant/inside air heat exchanger 12 .

In the above embodiment, in the first refrigerant circuit 1, the second stop mode is set by causing the first refrigerant R1 to flow to the inside air cooler bypass pipe line 1c side, but the second stop mode is not limited to this. For example, the first refrigerant R1 is flowed not to the internal air cooler bypass 1c side but to the first refrigerant pipe line 1a side where the internal air cooler 16 is located, and the expansion at the first expansion valve 15 is stopped, and the internal air side is bypassed. The second stop mode may be set by preventing the internal air from passing through the internal air cooler 16 by turning the internal temperature on.

In order to bypass the indoor air side, for example, an HVAC (Heating, Ventilating and Air Conditioning) air damper as an air conditioning unit for the vehicle interior may be switched or the blower fan may be stopped.

In order to stop the expansion at the third expansion valve 13 and the first expansion valve 15, for example, the throttle opening of the third expansion valve 13 and the first expansion valve 15 is fully opened, or the third expansion valve 13 and the first expansion valve The first refrigerant R1 may be prevented from passing through the third expansion valve 13 and the first expansion valve 15 by bypassing the valve 15 .

In the above embodiment, the cooling water circuit 2 is configured as a non-radiating circuit by stopping the cooling fan 23, but the non-radiating circuit is not limited to this. For example, while the cooling fan 23 is operating, a grille shutter attached to the front grille of the vehicle is closed to prevent outside air from passing through the radiator 22. The cooling water circuit 2 may be provided with a three-way valve that switches between flowing the cooling water to the road side and flowing to the cooling water pipe line 2a side, so that the radiator 22 does not release heat from the cooling water L to the outside air.

In the above embodiment, in the second refrigerant circuit 3, the fourth stop mode is set by flowing the second refrigerant R2 to the second refrigerant/cooling water heat exchanger bypass pipe 3c side. Not exclusively. For example, the second refrigerant R2 is flowed not to the second refrigerant/cooling water heat exchanger bypass pipe 3c side but to the second refrigerant pipe 3a side where the second refrigerant/cooling water heat exchanger 5 is present, and the second expansion valve 34 , and by bypassing the cooling water L side so that the cooling water L does not pass through the second refrigerant/cooling water heat exchanger 5, the fourth stop mode may be set.

In order to bypass the cooling water L side, for example, a bypass pipe that bypasses the second refrigerant/cooling water heat exchanger 5 and a three-way valve that switches the flow path to the bypass pipe or the cooling water pipe 2a are connected to the cooling water. It may be provided in the circuit 2.

In order to stop the expansion in the second expansion valve 34, for example, the throttle opening of the second expansion valve 34 is fully opened, or the second expansion valve 34 is bypassed so that the second refrigerant R2 passes through the second expansion valve 34. You can try not to do it.

In the above embodiment, in the circulation direction of the cooling water L in the cooling water circuit 2, the water pump 20, the second refrigerant/cooling water heat exchanger 5, the radiator 22, the first refrigerant/cooling water heat exchanger 4, and the electrical component 21 However, the circulation direction of the cooling water L in the cooling water circuit 2 and the arrangement order of the components are not limited to this. However, from the viewpoint of the cooling effect of the cooling water L on the electrical component 21, in the circulation direction of the cooling water L, the electrical component 21, the first refrigerant/cooling water heat exchanger 4, the radiator 22, and the second refrigerant/cooling water heat exchange 5, or the electrical component 21, the first refrigerant/coolant heat exchanger 4, the second refrigerant/coolant heat exchanger 5 and the radiator 22 are preferred.

The vehicle thermal management system of the present invention can be used in a battery-equipped vehicle.

REFERENCE SIGNS LIST 1 first refrigerant circuit 2 cooling water circuit 3 second refrigerant circuit 4 first refrigerant/cooling water heat exchanger 5 second refrigerant/cooling water heat exchanger 6 control unit 10 first compressor 11 … 1st three-way valve (first refrigerant/inside air heat exchanger bypass switching unit)
DESCRIPTION OF SYMBOLS 12... 1st refrigerant|coolant/internal air heat exchanger 13... 1st expansion valve 14... 2nd three-way valve (1st refrigerant/internal air heat exchanger bypass switching part)
DESCRIPTION OF SYMBOLS 15... 3rd expansion valve 16... Inside air cooler 1b... First refrigerant/inside air heat exchanger bypass line 1c... Inside air cooler bypass line 20... Water pump 21... Electric part 22... Radiator 30... Second compressor 31 …Four-way valve (direction switching part)
32... Second refrigerant/external air heat exchanger 33... Third three-way valve (second refrigerant/cooling water heat exchanger bypass switching unit)
35... Fourth three-way valve (second refrigerant/cooling water heat exchanger bypass switching unit)
34... Second expansion valve 36... Fifth three-way valve (battery heat exchanger bypass switching unit)
39... Sixth three-way valve (battery heat exchanger bypass switching unit)
37... Fourth expansion valve 38... Battery heat exchanger 3b... Battery heat exchanger bypass line 3c... Second refrigerant/cooling water heat exchanger bypass line

Claims (10)

A first compressor that compresses a first refrigerant and circulates the first refrigerant in a circuit, a first expansion valve, and an internal air cooler that exchanges heat between the first refrigerant and indoor air supplied to the vehicle interior. and a first refrigerant circuit that air-conditions the interior of the vehicle;
a cooling water circuit for cooling vehicle-mounted electrical components, comprising a water pump for circulating cooling water in the circuit and a radiator for exchanging heat between the cooling water and outside air;
a second compressor that compresses a second refrigerant and circulates the second refrigerant in a circuit; a second refrigerant/outside air heat exchanger that exchanges heat between the second refrigerant and the outside air; and a second expansion valve. and a second refrigerant circuit that adjusts the temperature of the vehicle battery;
a first refrigerant/cooling water heat exchanger connected to the first refrigerant circuit and the cooling water circuit for exchanging heat between the first refrigerant and the cooling water;
a second refrigerant/cooling water heat exchanger connected to the second refrigerant circuit and the cooling water circuit to exchange heat between the second refrigerant and the cooling water;
a control unit that controls operations of the first refrigerant circuit, the cooling water circuit, and the second refrigerant circuit;
The first refrigerant circuit, the cooling water circuit, and the second refrigerant circuit operate in a vehicle interior cooling water cooling mode for cooling the vehicle interior and cooling the cooling water under the control of the control unit,
In the first refrigerant circuit in the vehicle interior cooling water cooling mode, the first refrigerant compressed by the first compressor functions as a condenser of the first refrigerant circuit for heat exchange between the first refrigerant and the cooling water. the first refrigerant decompressed by the first expansion valve after heat dissipation absorbs heat from the room air in the inside air cooler functioning as an evaporator of the first refrigerant circuit;
In the cooling water circuit in the vehicle interior cooling cooling water cooling mode, the cooling water circulating in the circuit absorbs heat from the first refrigerant in the first refrigerant/cooling water heat exchanger, and is transferred to the radiator. radiating heat to the outside air and radiating heat to the second refrigerant at the second refrigerant/cooling water heat exchanger;
In the second refrigerant circuit in the vehicle interior cooling water cooling mode, the second refrigerant/outside air heat exchanger in which the second refrigerant compressed by the second compressor functions as a condenser of the second refrigerant circuit. and the second refrigerant decompressed by the second expansion valve after the heat is released into the cooling water by the second refrigerant/cooling water heat exchanger that functions as an evaporator of the second refrigerant circuit. A heat management system for a vehicle characterized by absorbing heat from. The control unit executes the vehicle interior cooling water cooling mode when the temperature of the cooling water exceeds a predetermined range, and executes the vehicle interior cooling water cooling mode when the temperature of the cooling water is within the predetermined range. 2. The vehicle thermal management system of claim 1, wherein no mode is executed. The first refrigerant circuit has a first refrigerant/inside air heat exchanger that exchanges heat between the first refrigerant and the indoor air, and a third expansion valve,
The second refrigerant circuit has a battery heat exchanger that exchanges heat between the second refrigerant and the vehicle battery, and a fourth expansion valve,
The control unit
a first normal mode in which heat is exchanged between the first refrigerant and the indoor air in the first refrigerant/inside air heat exchanger and the first refrigerant is expanded in the third expansion valve; and the first refrigerant / A first stop mode in which the heat exchange between the first refrigerant and the room air is stopped in the inside air heat exchanger, and the first refrigerant is circulated in a state where the expansion in the third expansion valve is stopped. and can be switched between, and
A second normal mode in which heat is exchanged between the first refrigerant and the indoor air in the inside air cooler and the first refrigerant is expanded in the first expansion valve, and the first refrigerant in the inside air cooler It is possible to switch between a second stop mode in which heat exchange between the refrigerant and the indoor air is stopped and the first refrigerant is circulated in a state in which the first expansion valve is stopped from expanding, and
A third normal mode in which heat is exchanged between the second refrigerant and the on-vehicle battery in the battery heat exchanger and the second refrigerant is expanded in the fourth expansion valve; It is possible to switch between a third stop mode in which heat exchange between the second refrigerant and the on-vehicle battery is stopped and the second refrigerant is circulated while expansion in the fourth expansion valve is stopped, and ,
a fourth normal mode in which heat is exchanged between the second refrigerant and the cooling water in the second refrigerant/cooling water heat exchanger and the second refrigerant is expanded in the second expansion valve; A fourth refrigerant/cooling water heat exchanger stops heat exchange between the second refrigerant and the cooling water, and the second refrigerant is circulated while stopping the expansion of the second expansion valve. It is possible to switch between stop mode and
2. The controller controls to operate in the first stop mode, the second normal mode, the third stop mode, and the fourth normal mode in the vehicle interior cooling water cooling mode. 3. The vehicle thermal management system according to claim 2. The second refrigerant circuit operates in a battery cooling mode for cooling the vehicle battery under the control of the control unit,
The control unit controls to operate in the third normal mode and the fourth stop mode in the battery cooling mode,
In the second refrigerant circuit in the battery cooling mode, the second refrigerant compressed by the second compressor is cooled to the outside air by the second refrigerant/outside air heat exchanger that functions as a condenser of the second refrigerant circuit. 4. The vehicle according to claim 3, wherein the second refrigerant depressurized by the fourth expansion valve after heat dissipation absorbs heat from the onboard battery in the battery heat exchanger functioning as an evaporator of the second refrigerant circuit. thermal management system. The first refrigerant circuit and the cooling water circuit operate in a vehicle interior heating mode for heating the vehicle interior under the control of the control unit,
The control unit controls to operate in the first normal mode and the second stop mode in the vehicle interior heating mode,
In the first refrigerant circuit in the vehicle interior heating mode, the first refrigerant compressed by the first compressor is passed through the first refrigerant/inside air heat exchanger that functions as a condenser of the first refrigerant circuit. The first refrigerant, which is decompressed by the third expansion valve after radiating heat, absorbs heat from the cooling water in the first refrigerant/cooling water heat exchanger functioning as an evaporator of the first refrigerant circuit. death,
In the cooling water circuit in the vehicle interior heating mode, the cooling water circulating in the circuit absorbs heat from the in-vehicle electrical component and/or absorbs heat from the outside air in the radiator, and the first refrigerant 5. The vehicle heat management system according to claim 3 or 4, wherein heat is radiated to the first refrigerant in a /cooling water heat exchanger. The second refrigerant circuit has a direction switching unit that reverses the circulation direction of the second refrigerant,
The second refrigerant circuit operates in a battery warm-up mode for warming up the in-vehicle battery under the control of the control unit,
The control unit controls to operate in the third normal mode and the fourth stop mode in the battery warm-up mode, and in the second refrigerant circuit, the refrigerant compressed by the second compressor controlling the circulation direction of the second refrigerant by the direction switching unit so that the second refrigerant is directed to the battery heat exchanger;
In the second refrigerant circuit in the battery warm-up mode, the second refrigerant compressed by the second compressor dissipates heat to the onboard battery in the battery heat exchanger that functions as a condenser of the second refrigerant circuit. and the second refrigerant decompressed by the fourth expansion valve after heat dissipation absorbs heat from the outside air in the second refrigerant/outside air heat exchanger functioning as an evaporator of the second refrigerant circuit. A thermal management system for a vehicle according to any one of Claims 1 to 3. The first refrigerant circuit includes a first refrigerant/internal air heat exchanger bypass that bypasses the first refrigerant/internal air heat exchanger and the third expansion valve, and a first refrigerant/internal air heat exchanger bypass that bypasses the first refrigerant/internal air heat exchanger. and a first refrigerant/inside air heat exchanger bypass switching unit that switches between flowing to the third expansion valve side and flowing to the first refrigerant/inside air heat exchanger bypass side,
The control unit
In the first normal mode, the first refrigerant is caused to flow toward the first refrigerant/inside air heat exchanger and the third expansion valve by the first refrigerant/inside air heat exchanger bypass switching unit, and
7. The first refrigerant/inside air heat exchanger bypass switching unit causes the first refrigerant to flow to the first refrigerant/inside air heat exchanger bypass side in the first stop mode. of thermal management systems for vehicles. The first refrigerant circuit includes an inside air cooler bypass that bypasses the inside air cooler and the first expansion valve, and a flow of the first refrigerant to the inside air cooler and the first expansion valve side, or the inside air cooler an internal air cooler bypass switching unit that switches whether to flow to the bypass side,
The control unit
In the second normal mode, the inside air cooler bypass switching unit causes the first refrigerant to flow toward the inside air cooler and the first expansion valve, and
8. The vehicle heat management system according to any one of claims 3 to 7, wherein in the second stop mode, the inside air cooler bypass switching unit causes the first refrigerant to flow to the inside air cooler bypass side. The second refrigerant circuit includes a battery heat exchanger bypass that bypasses the battery heat exchanger and the fourth expansion valve, and a second refrigerant that flows to the battery heat exchanger and the fourth expansion valve side, or the a battery heat exchanger bypass switching unit that switches whether to flow to the battery heat exchanger bypass side,
The control unit
In the third normal mode, the second refrigerant is caused to flow toward the battery heat exchanger and the fourth expansion valve by the battery heat exchanger bypass switching unit, and
9. The vehicle heat management system according to any one of claims 3 to 8, wherein in the third stop mode, the second refrigerant is caused to flow to the battery heat exchanger bypass side by the battery heat exchanger bypass switching unit. The second refrigerant circuit includes a second refrigerant/coolant heat exchanger bypass that bypasses the second refrigerant/coolant heat exchanger and the second expansion valve, and a second refrigerant/coolant heat exchanger that bypasses the second refrigerant/coolant heat exchanger. a heat exchanger and a second refrigerant/cooling water heat exchanger bypass switching unit that switches between flowing to the second expansion valve side and flowing to the second refrigerant/cooling water heat exchanger bypass side;
The control unit
In the fourth normal mode, the second refrigerant/cooling water heat exchanger bypass switching unit causes the second refrigerant to flow toward the second refrigerant/cooling water heat exchanger and the second expansion valve, and
10. Any one of claims 3 to 9, wherein in the fourth stop mode, the second refrigerant/cooling water heat exchanger bypass switching unit causes the second refrigerant to flow to the second refrigerant/cooling water heat exchanger bypass side. A vehicle thermal management system as described in paragraph 1.

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