JP7431637B2 - Vehicle air conditioner - Google Patents

Description

The present invention relates to a vehicle air conditioner.

In electric vehicles and hybrid vehicles, batteries are charged by regeneration during driving, but batteries deteriorate when overcharged. Therefore, when the remaining capacity of the battery is high, power is consumed using a resistance circuit, or as shown in Patent Document 1, an electric load is activated to consume power.

Japanese Patent Application Publication No. 6-105405

If a discharging means such as a resistive circuit or an electric load is used to prevent overcharging of the battery, new components will be added, so there is room for improvement.
An object of the present invention is to consume battery power with existing components and to suppress overcharging.

A vehicle air conditioner according to one aspect of the present invention is provided in a vehicle equipped with a battery that supplies power to an electric motor. A vehicular air conditioner includes a refrigeration cycle circuit that circulates a medium, and the heating circuit is configured to connect a heater that heats a heating medium and an air conditioning heat medium of the refrigeration cycle circuit. It is equipped with a heat exchanger that exchanges heat and a radiator that is installed in parallel with the heat exchanger and exchanges heat with the outside air, and switches the circuit according to the remaining capacity of the battery that is regeneratively charged while the vehicle is running. A circuit switching control unit is provided, and the circuit switching control unit operates the heater to supply the heated heating medium when the remaining capacity of the battery that is regeneratively charged while the vehicle is running is equal to or higher than a predetermined threshold. According to the operation of the refrigeration cycle circuit, it is circulated to either the heat exchanger or the radiator.

According to the present invention, when the remaining capacity of the battery is equal to or higher than a predetermined threshold, the heater of the heating circuit is activated to consume the power of the battery. It is becoming common for heaters in heating circuits to be mounted on vehicles. Therefore, battery power can be consumed by existing components and overcharging of the battery can be suppressed.

FIG. 1 is a diagram showing a vehicle air conditioner. It is a figure showing heating operation. It is a figure showing dehumidification heating operation. It is a figure showing dehumidification cooling operation. It is a figure showing air conditioning operation. FIG. 2 is a block diagram of a vehicle air conditioner. It is a flow chart which shows an example of discharge control processing. It is a figure showing heating operation + heater operation. It is a diagram showing cooling operation + heater operation. It is a figure showing heating operation + heater operation (radiator heat radiation). It is a figure showing battery heating operation. It is a figure showing battery cooling operation. It is a figure showing heating auxiliary operation by a heater (heater core). It is a figure showing motor cooling operation.

Embodiments of the present invention will be described below based on the drawings. Note that each drawing is schematic and may differ from the actual drawing. Furthermore, the following embodiments are intended to exemplify devices and methods for embodying the technical idea of the present invention, and the configuration is not limited to the following. That is, the technical idea of the present invention can be modified in various ways within the technical scope described in the claims.

《One embodiment》
"composition"
FIG. 1 is a diagram showing a vehicle air conditioner.
The vehicle is a vehicle, such as an electric vehicle or a plug-in hybrid vehicle, whose battery 45 can be charged by charging from an external power source, and which drives an electric motor 46 using the electric power charged in the battery 45 to travel. The vehicle air conditioner 11 is mounted on a vehicle and is driven by power from a battery 45. The vehicle air conditioner 11 includes a refrigeration cycle circuit 12 and an HVAC unit 13, and selectively performs each air conditioning operation of heating operation, dehumidifying heating operation, cooling operation, and dehumidifying cooling operation using a heat pump using an air conditioning heat medium. Execute and air condition the inside of the vehicle.

First, the basic components of the refrigeration cycle circuit 12 will be explained.
The refrigeration cycle circuit 12 includes a compressor 21 , a radiator 22 , an outdoor expansion valve 23 , an outdoor heat exchanger 24 , an indoor expansion valve 25 , a heat absorber 26 , and an accumulator 27 .
The compressor 21 compresses a low-pressure air-conditioning heat medium in a gas phase to increase the pressure of the air-conditioning heat medium into a high-pressure air-conditioning heat medium that is easily liquefied, and is, for example, a scroll compressor, a swash plate compressor, or the like. The drive source for the compressor 21 is, for example, an electric motor. The compressor 21 is an oil-supplied type in which lubrication is performed by oil that circulates together with the air conditioning heat medium, and the oil concentration relative to the air conditioning heat medium is about several percent.

The radiator 22 is provided in the HVAC unit 13 and performs heat exchange between the air passing around the radiating fins and the high-temperature, high-pressure air conditioning heat medium passing through the tube. That is, the air conditioning heat medium in the tube is condensed and liquefied by heat radiation, thereby warming the air around the heat radiation fins.
The outdoor expansion valve 23 reduces the pressure to a low-pressure air-conditioning heat medium that is easily vaporized by blowing out a high-pressure air-conditioning heat medium in the liquid phase in the form of a mist, and the degree of opening can be adjusted from fully closed to fully open. It is.

The outdoor heat exchanger 24 is provided inside the front grill of the vehicle body, and performs heat exchange between the outside air passing around the radiation fins and the air conditioning heat medium passing through the tubes. The outside air is mainly the running wind, but when sufficient running wind is not obtained, the blower 28 is driven to blow outside air against the heat radiation fins. During heating or dehumidifying/heating, the outdoor heat exchanger 24 functions as an evaporator, that is, a heat absorber, and the outdoor heat exchanger 24 functions as an evaporator, that is, a heat absorber, to exchange air between the outside air passing around the radiation fins and the low-temperature air conditioning heat medium (refrigerant) passing through the tubes. Perform heat exchange. That is, the air conditioning heat medium inside the tube absorbs heat and evaporates. On the other hand, during dehumidifying cooling or cooling, the outdoor heat exchanger 24 functions as a condenser, that is, a radiator, and the outdoor heat exchanger 24 functions as a condenser, that is, a radiator, and the outside air passing around the radiating fins and the high temperature air conditioning heat medium passing through the tubes are mixed. Heat exchange takes place between the two. That is, the heat medium for air conditioning inside the tube is made to radiate heat and condense and liquefy.

The indoor expansion valve 25 reduces the pressure to a low-pressure air-conditioning heat medium that is easily vaporized by blowing out a high-pressure air-conditioning heat medium in the liquid phase in the form of a mist, and the opening degree can be adjusted from fully closed to fully open. It is.
The heat absorber 26 is provided in the HVAC unit 13 and performs heat exchange between the air passing around the radiation fins and the low-temperature air conditioning heat medium (refrigerant) passing through the tube. That is, the air-conditioning heat medium in the tube evaporates due to heat absorption, thereby cooling the air around the radiation fins and dehumidifying the air by forming dew condensation on the surface of the radiation fins.
The accumulator 27 performs gas-liquid separation of the heat medium for air conditioning, and supplies only the heat medium for air conditioning in the gas phase to the compressor 21.

Next, the basic circuit configuration of the refrigeration cycle circuit 12 will be explained.
In the figure, the flow path of the heat medium for air conditioning is shown by a solid line. The outlet of the compressor 21 communicates with the inlet of the radiator 22 via a pipe 31a. The outlet of the radiator 22 communicates with the inlet of the outdoor heat exchanger 24 via a pipe 31b, and the pipe 31b is provided with an outdoor expansion valve 23.
The outlet of the outdoor heat exchanger 24 communicates with the inlet of the compressor 21 via a pipe 31c, and the pipe 31c has an on-off valve 32 extending from the outdoor heat exchanger 24 side to the radiator 22 side. , a check valve 33, and an accumulator 27 are provided in this order. The on-off valve 32 opens or closes the pipe 31c. The check valve 33 allows passage from the on-off valve 32 side to the accumulator 27 side, and prevents passage in the opposite direction.

There is a branch point 34 between the heat radiator 22 and the outdoor expansion valve 23 in the pipe 31b, and this branch point 34 communicates with the inlet of the heat sink 26 via the pipe 31d. , an on-off valve 35 and an indoor expansion valve 25 are provided in this order from the branch point 34 side toward the heat absorber 26 side. The on-off valve 35 opens or closes the pipe 31d.
There is a branch point 36 between the outdoor heat exchanger 24 and the on-off valve 32 in the pipe 31c, and a branch point 37 between the on-off valve 35 and the indoor expansion valve 25 in the pipe 31d. The branch point 36 communicates with a branch point 37 via a pipe 31e, and a check valve 38 is provided in the pipe 31e. The check valve 38 allows passage from the branch point 36 side to the branch point 37 side, and prevents passage in the opposite direction.
There is a branch point 39 between the on-off valve 32 and the check valve 33 in the pipe 31c, and the outlet of the heat absorber 26 communicates with the branch point 39 via the pipe 31f.

Next, the basic configuration of the HVAC unit 13 will be explained.
The HVAC unit 13 (HVAC: Heating Ventilation and Air Conditioning) is located inside the dashboard, and is formed by a duct that introduces outside air or inside air from one end and supplies air into the passenger compartment from the other end. There is. Inside the HVAC unit 13, a blower fan 14, a heat absorber 26, a heat radiator 22, and an air mix damper 15 are provided. The blower fan 14 is provided at one end of the HVAC unit 13, and when driven, sucks outside air or inside air and discharges it to the other end. The heat absorber 26 is provided downstream of the blower fan 14. All the air blown out from the blower fan 14 passes through the heat absorber 26. A flow path 16 that passes through the heat radiator 22 and a flow path 17 that bypasses the heat radiator 22 are formed inside the HVAC unit 13 on the downstream side of the heat absorber 26 . The flow path 16 and the flow path 17 merge on the downstream side.

The air mix damper 15 is rotatable between a position where the flow path 16 is opened and the flow path 17 is closed, and a position where the flow path 16 is closed and the flow path 17 is opened. When the air mix damper 15 is in the position where the flow path 16 is opened and the flow path 17 is closed, all the air that has passed through the heat absorber 26 passes through the heat radiator 22. When the air mix damper 15 is in the position of closing the flow path 16 and opening the flow path 17, all the air that has passed through the heat absorber 26 bypasses the heat radiator 22. When the air mix damper 15 is in a position to open both the flow path 16 and the flow path 17, part of the air that has passed through the heat absorber 26 passes through the radiator 22, and the rest bypasses the radiator 22. , on the downstream side of the HVAC unit 13, the air that has passed through the radiator 22 and the air that has bypassed the radiator 22 are mixed.

Next, additional configurations will be explained.
The vehicle air conditioner 11 includes a temperature control circuit 41, and controls the temperature of the battery 45 by circulating a heat medium for temperature control. Temperature control means adjusting or regulating temperature. The heat medium for temperature adjustment is water, for example, but other fluids such as refrigerant and coolant may also be used.
First, the main components of the temperature control circuit 41 will be explained.
The temperature control circuit 41 includes a main pump 42, a heater 43, a heater core 44, a battery 45, an electric motor 46, a heat exchanger 47, a radiator 48, and a sub pump 49.

The main pump 42 circulates the temperature regulating heat medium by sucking the temperature regulating heat medium from the temperature regulating circuit 41 from one side and discharging it to the other side.
The heater 43 is, for example, a water heater (ECH: Electric Coolant Heater) that heats the heat medium for temperature adjustment.
The heater core 44 is provided on the downstream side of the radiator 22 in the flow path 16, and performs heat exchange between the air passing around the radiating fins and the temperature regulating heat medium passing through the tube. Let's do it. The heater core 44 heats the air around the radiation fins when the heated temperature control heat medium is supplied.

The battery 45 is a storage battery that supplies power to the electric motor 46, and is, for example, a lithium ion battery. The temperature of the battery 45 is controlled by flowing the temperature regulating heat medium through the water jacket formed in the battery 45. The battery 45 is one of the power devices that requires temperature control, but is not limited thereto. The present invention may also be applied to power supply systems, chargers, inverters, high voltage components, etc. as power equipment requiring temperature control.
The electric motor 46 is a motor for driving the vehicle. Heat storage in the electric motor 46 or cooling of the electric motor 46 is performed by the temperature regulating heat medium flowing through the water jacket formed in the electric motor 46 .

The heat exchanger 47 includes a temperature control heat medium flow path 47A through which a temperature control heat medium passes, and an air conditioning heat medium flow path 47B through which an air conditioning heat medium passes, and serves as an air conditioner for a part of the refrigeration cycle circuit 12. Heat exchange is performed between the heating medium for use in the heating medium and the heating medium for temperature adjustment in the temperature adjustment circuit 41.
The radiator 48 is disposed on the leeward side of the outdoor heat exchanger 24, and exchanges heat between the temperature regulating heat medium passing through it and the outside air passing around it, and causes the temperature regulating heat medium inside the tube to radiate heat. A blower 28 is provided on the windward side of the outdoor heat exchanger 24, and even when the vehicle is stopped or running at low speed, the blower 28 can be driven to keep the outdoor heat exchanger 24 and Air is supplied to the radiator 48.
The sub pump 49 circulates the temperature regulating heat medium by sucking the temperature regulating heat medium from the temperature regulating circuit 41 from one side and discharging it to the other side.

Next, the circuit configuration of the temperature control circuit 41 will be explained.
In the figure, the flow path of the heat medium for temperature adjustment is shown by a broken line. The outlet of the main pump 42 communicates with the inlet of the heater core 44 via a pipe 51a. The outlet of the heater core 44 communicates with the inlet of the main pump 42 via a pipe 51b. A heater 43 and a three-way valve 52 are provided in the piping 51a in this order from the main pump 42 side to the heater core 44 side. The piping 51b is provided with a branch point 53 and a branch point 54 in this order from the heater core 44 side toward the main pump 42 side.

The three-way valve 52 has an inlet that communicates with the heater 43, one outlet that communicates with the inlet of the heater core 44, and the other outlet that communicates with the inlet of the temperature regulating heat medium flow path 47A in the heat exchanger 47 via piping 51c. are doing. The outlet of the temperature regulating heat medium flow path 47A in the heat exchanger 47 communicates with the branch point 54 via a pipe 51d. The piping 51c includes, from the three-way valve 52 side toward the heat exchanger 47 side, a three-way valve 61, a battery 45, a branch point 62, a three-way valve 63, a branch point 64, an electric motor 46, a three-way valve 65, and a branch point. 66 are provided in order. A three-way valve 68 is provided in the pipe 51d.

The three-way valve 61 has an inlet communicating with the three-way valve 52, one outlet communicating with the battery 45, and the other outlet communicating with the branch point 62 via a pipe 51e. The three-way valve 63 has an inlet communicating with the branch point 62, one outlet communicating with the branch point 64, and the other outlet communicating with the branch point 53 via the pipe 51f. A three-way valve 68 is provided in the pipe 51f. The three-way valve 68 has an inlet communicating with the three-way valve 63, one outlet communicating with the branch point 53, and the other outlet communicating with the branch point 66 via the pipe 51g.

The outlet of the sub-pump 49 communicates with the branch point 64 via a pipe 51h. The three-way valve 65 has an inlet communicating with the electric motor 46, one outlet communicating with the branch point 66, and the other outlet communicating with the inlet of the sub-pump 49 via the piping 51i. A radiator 48 and a branch point 69 are provided in the piping 51i in this order from the three-way valve 65 side to the sub-pump 49 side. The three-way valve 68 has one inlet communicating with the temperature control heat medium flow path 47A in the heat exchanger 47, the other inlet communicating with the branch point 69 via the piping 51j, and the outlet communicating with the branch point 54. There is.

Next, additional components of the refrigeration cycle circuit 12 will be explained.
The refrigeration cycle circuit 12 includes an expansion valve 55 and a heat exchanger 47.
The expansion valve 55 reduces the pressure to a low-pressure air-conditioning heat medium that is easily vaporized by blowing out a high-pressure air-conditioning heat medium in a liquid phase in the form of a mist, and its opening degree can be adjusted from fully closed to fully open. be.
Next, an additional circuit configuration of the refrigeration cycle circuit 12 will be explained.
A branch point 56 exists between the branch point 37 and the indoor expansion valve 25 in the pipe 31d, and a branch point 57 exists between the check valve 33 and the accumulator 27 in the pipe 31c. The branch point 56 communicates with the inlet of the air conditioning heat medium flow path 47B in the heat exchanger 47 via the pipe 31g, and the outlet of the air conditioning heat medium flow path 47B in the heat exchanger 47 branches through the pipe 31h. It communicates with point 57. An expansion valve 55 is provided in the pipe 31g.

Next, the basic operation of the vehicle air conditioner 11 will be explained.
The controller 71 is, for example, a microcomputer, and selectively executes each air conditioning operation of heating operation, dehumidification heating operation, cooling operation, and dehumidification cooling operation in response to an operation request from a user, and air-conditions the vehicle interior. Here, in order to explain the basic operation, the operation of the refrigeration cycle circuit 12 and the operation of the HVAC unit 13 will be explained. That is, the controller 71 drives and controls the compressor 21 , the outdoor expansion valve 23 , the on-off valve 32 , the on-off valve 35 , the indoor expansion valve 25 , the expansion valve 55 , the blower 28 , the blower fan 14 , and the air mix damper 15 .

[Heating operation]
FIG. 2 is a diagram showing heating operation.
In the figure, the flow path through which the low-pressure air-conditioning heat medium passes is shown by a thick dotted line, the flow path through which the high-pressure air-conditioning heat medium passes through is shown by a thick solid line, open on-off valves are shown in white, and closed valves are shown in white. The on-off valves are shown in black. When performing heating operation using the refrigeration cycle circuit 12, the outdoor expansion valve 23 is slightly opened, the on-off valve 32 is opened, the on-off valve 35 is closed, the indoor expansion valve 25 is closed, and the expansion valve 55 is closed. In this state, the compressor 21 is driven.

Thereby, the heat medium for air conditioning is compressor 21, radiator 22, branch point 34, outdoor expansion valve 23, outdoor heat exchanger 24, branch point 36, on-off valve 32, branch point 39, check valve 33, branch It circulates through point 57 and accumulator 27 in turn. In this circulation path, the air-conditioning heat medium in the gas phase is compressed by the compressor 21 to become high pressure, and is condensed and liquefied by dissipating heat by the radiator 22, and becomes low temperature. The air-conditioning heat medium in the liquid phase is expanded by the outdoor expansion valve 23 to have a low pressure, and absorbs heat by the outdoor heat exchanger 24 to evaporate and vaporize to a high temperature.
On the other hand, the HVAC unit 13 drives the blower fan 14 and adjusts the proportion of air passing through the radiator 22 while closing the flow path 17 with the air mix damper 15. As a result, the introduced air is heated by the radiator 22, and warm air is supplied into the vehicle interior.

In addition, during heating operation, the outdoor heat exchanger 24 functions as an evaporator, so as the area around the outdoor heat exchanger 24 is cooled, moisture in the air may sublimate, and frost may form on the radiation fins. . Moreover, when frost grows and the ventilation passages of the radiation fins are blocked, the heat exchange efficiency of the outdoor heat exchanger 24 is reduced. Therefore, when the occurrence of frost is detected from the temperature of the outdoor heat exchanger 24, a defrosting operation is performed. When defrosting operation is performed, the blowing fan 14 is stopped and the flow path 16 is closed with the air mix damper 15. It is the same as heating operation. As a result, heat radiation of the air-conditioning heat medium at the radiator 22 is suppressed, so that the air-conditioning heat medium is supplied to the outdoor heat exchanger 24 while remaining at a high temperature, and the frost is melted.

[Dehumidifying heating operation]
FIG. 3 is a diagram showing the dehumidifying heating operation.
In the figure, the flow path through which the low-pressure air-conditioning heat medium passes is shown by a thick dotted line, the flow path through which the high-pressure air-conditioning heat medium passes through is shown by a thick solid line, open on-off valves are shown in white, and closed valves are shown in white. The on-off valves are shown in black. When performing dehumidifying heating operation using the refrigeration cycle circuit 12, the outdoor expansion valve 23 is slightly opened, the on-off valve 32 is opened, the on-off valve 35 is opened, the indoor expansion valve 25 is slightly opened, and the expansion valve 55 is opened. The compressor 21 is driven in the closed state.

Thereby, the heat medium for air conditioning is compressor 21, radiator 22, branch point 34, outdoor expansion valve 23, outdoor heat exchanger 24, branch point 36, on-off valve 32, branch point 39, check valve 33, branch It circulates through point 57 and accumulator 27 in turn. A part of the air conditioning heat medium that has passed through the radiator 22 is branched from the branch point 34 and branched via the on-off valve 35, the branch point 37, the branch point 56, the indoor expansion valve 25, and the heat absorber 26. Joins point 39. In these circulation paths, the air-conditioning heat medium in the gas phase is compressed by the compressor 21 to become high pressure, and is condensed and liquefied by dissipating heat by the radiator 22, and becomes low temperature. The air-conditioning heat medium in the liquid phase is expanded by the outdoor expansion valve 23 to have a low pressure, and absorbs heat by the outdoor heat exchanger 24 to evaporate and vaporize to a high temperature. Further, a part of the liquid-phase air conditioning heat medium is expanded by the indoor expansion valve 25 to have a low pressure, and is evaporated by absorbing heat by the heat absorber 26, resulting in a high temperature.
On the other hand, the HVAC unit 13 drives the blower fan 14 and adjusts the proportion of air passing through the radiator 22 while closing the flow path 17 with the air mix damper 15. Thereby, the introduced air is dehumidified by the heat absorber 26, then heated by the radiator 22, and the dehumidified warm air is supplied into the vehicle interior.

[Dehumidifying cooling operation]
FIG. 4 is a diagram showing the dehumidifying cooling operation.
In the figure, the flow path through which the low-pressure air-conditioning heat medium passes is shown by a thick dotted line, the flow path through which the medium-pressure air-conditioning heat medium passes through is shown by a thick broken line, and the flow path through which the high-pressure air-conditioning heat medium passes through is shown by a thick dotted line. The open on-off valves are shown in white, and the closed on-off valves are shown in black. When performing dehumidification cooling operation using the refrigeration cycle circuit 12, the outdoor expansion valve 23 is slightly opened, the on-off valve 32 is closed, the on-off valve 35 is closed, the indoor expansion valve 25 is slightly opened, and the expansion valve 55 is closed. The compressor 21 is driven in the closed state.

Thereby, the heat medium for air conditioning is compressor 21, radiator 22, branch point 34, outdoor expansion valve 23, outdoor heat exchanger 24, branch point 36, check valve 38, branch point 37, branch point 56, indoor It circulates through the expansion valve 25, the heat absorber 26, the branch point 39, the check valve 33, the branch point 57, and the accumulator 27 in this order. In this circulation path, the air-conditioning heat medium in the gas phase is compressed by the compressor 21 to become high pressure, expanded by the outdoor expansion valve 23 to become medium pressure, and condensed and liquefied by dissipating heat in the outdoor heat exchanger 24, and then reduced to a low temperature. Become. The air conditioning heat medium in the liquid phase is expanded by the indoor expansion valve 25 to have a low pressure, and is evaporated by absorbing heat by the heat absorber 26 to become high temperature.
On the other hand, in the HVAC unit 13, while driving the blower fan 14, the flow path 16 is slightly closed by the air mix damper 15, and the ratio of bypassing the radiator 22 is adjusted. As a result, the introduced air is dehumidified and cooled by the heat absorber 26, and cool air is supplied into the vehicle interior.

[Cooling operation]
FIG. 5 is a diagram showing the cooling operation.
In the figure, the flow path through which the low-pressure air-conditioning heat medium passes is shown by a thick dotted line, the flow path through which the high-pressure air-conditioning heat medium passes through is shown by a thick solid line, open on-off valves are shown in white, and closed valves are shown in white. The on-off valves are shown in black. When performing cooling operation using the refrigeration cycle circuit 12, the outdoor expansion valve 23 is fully opened, the on-off valve 32 is closed, the on-off valve 35 is closed, the indoor expansion valve 25 is slightly opened, and the expansion valve 55 is closed. In this state, the compressor 21 is driven.

Thereby, the heat medium for air conditioning is compressor 21, radiator 22, branch point 34, outdoor expansion valve 23, outdoor heat exchanger 24, branch point 36, check valve 38, branch point 37, branch point 56, indoor It circulates through the expansion valve 25, the heat absorber 26, the branch point 39, the check valve 33, the branch point 57, and the accumulator 27 in this order. In this circulation path, the air-conditioning heat medium in the gas phase is compressed by the compressor 21 to become high pressure, and is condensed and liquefied by dissipating heat in the outdoor heat exchanger 24, and becomes low temperature. The air conditioning heat medium in the liquid phase is expanded by the indoor expansion valve 25 to have a low pressure, and is evaporated by absorbing heat by the heat absorber 26 to become high temperature.
On the other hand, in the HVAC unit 13, while driving the blower fan 14, the flow path 16 is slightly closed by the air mix damper 15, and the ratio of bypassing the radiator 22 is adjusted. As a result, the introduced air is cooled by the heat absorber 26, and cool air is supplied into the vehicle interior.

Next, the main control processing of the vehicle air conditioner 11 will be explained.
FIG. 6 is a block diagram of the vehicle air conditioner.
The vehicle air conditioner 11 includes a controller 71, an SOC acquisition section 72, and a temperature sensor 73.
The SOC acquisition unit 72 acquires the state of charge (SOC) corresponding to the remaining capacity of the battery 45. For example, the charging state of the battery 45 is acquired by measuring the charging/discharging current and cell voltage within the battery 45. The temperature sensor 73 detects the temperature Tc of the temperature regulating heat medium on the exit side of the temperature regulating heat medium flow path 47A of the heat exchanger 47. Each signal is input to the controller 71.

The controller 71 executes discharge control processing and drives and controls the refrigeration cycle circuit 12, the HVAC unit 13, and the temperature control circuit 41. That is, the controller 71 drives and controls the compressor 21, the outdoor expansion valve 23, the on-off valve 32, the on-off valve 35, the indoor expansion valve 25, the expansion valve 55, and the blower 28 of the refrigeration cycle circuit 12. Further, the controller 71 drives and controls the blower fan 14 and air mix damper 15 of the HVAC unit 13. Further, the controller 71 drives and controls the main pump 42, heater 43, sub pump 49, three-way valve 52, three-way valve 61, three-way valve 63, three-way valve 65, three-way valve 68, and three-way valve 68 of the temperature control circuit 41.

FIG. 7 is a flowchart illustrating an example of discharge control processing.
The discharge control process is executed as a timer interrupt process at predetermined time intervals.
In step S101, it is determined whether the remaining capacity of the battery 45 is greater than or equal to a predetermined threshold th. The threshold value th is a value slightly lower than full charge, for example, about 90%. Here, when the remaining capacity of the battery 45 is less than the threshold value th, it is determined that regenerative charging can still be performed, and the process returns to the predetermined main program. On the other hand, when the remaining capacity of the battery 45 is equal to or greater than the threshold value th, it is determined that regenerative charging cannot be performed any longer, and the process moves to step S102.

In step S102, the heater 43 is activated.
In the following step S103, it is determined whether or not the refrigeration cycle circuit 12 is performing heating operation. Here, when the refrigeration cycle circuit 12 is performing heating operation, the process moves to step S103. On the other hand, when the refrigeration cycle circuit 12 is not performing the heating operation, that is, is performing the cooling operation, or has stopped the air conditioning operation, the process moves to step S106. Here, to simplify the explanation, it is simply determined whether or not heating operation is being performed, but since heating operation and dehumidifying heating operation are equivalent in terms of warming the vehicle interior, heating operation and dehumidifying operation This also includes determining whether any heating operation is being performed.

In step S104, it is determined whether the temperature Tc of the temperature regulating heat medium at the outlet side of the temperature regulating heat medium flow path 47A of the heat exchanger 47 is less than a predetermined threshold T1. The threshold value T1 is, for example, about 40 to 50°C. Here, when the temperature Tc of the heat medium for temperature adjustment is less than the threshold value T1, it is determined that sufficient heat is radiated by the heat exchanger 47, and the process moves to step S105. On the other hand, when the temperature Tc of the heat medium for temperature adjustment is equal to or higher than the threshold value T1, it is determined that the heat exchanger 47 is not dissipating sufficient heat, and the process proceeds to step S106.

In step S105, heating operation is performed by the refrigeration cycle circuit 12, and heat is radiated from the heat medium for temperature control heated by the heater 43 through the heat medium flow path 47A for temperature control of the heat exchanger 47, and the process returns to the predetermined main program. . Specifically, in the refrigeration cycle circuit 12, the outdoor expansion valve 23 was slightly opened, the on-off valve 32 was opened, the on-off valve 35 was opened, the indoor expansion valve 25 was closed, and the expansion valve 55 was slightly opened. In this state, the compressor 21 is driven. On the other hand, in the temperature control circuit 41, the main pump 42 is driven while the heater 43 is operated, the sub-pump 49 is stopped, and the heat medium for temperature control is circulated. In addition, the heat medium for temperature regulation is the heat for temperature regulation of the main pump 42, the heater 43, the three-way valve 52, the three-way valve 61, the piping 51e, the branch point 62, the three-way valve 63, the three-way valve 68, the branch point 66, and the heat exchanger 47. Each three-way valve is controlled so that the medium circulates through the medium flow path 47A, the three-way valve 67, and the branch point 54 in this order.

In step S106, irrespective of the operation of the refrigeration cycle circuit 12, the heat medium for temperature adjustment heated by the heater 43 is radiated by the radiator 48, and the program returns to the predetermined main program. Specifically, in the temperature control circuit 41, the main pump 42 is driven, the sub-pump 49 is stopped, and the temperature control heat medium is circulated. In addition, the heat medium for temperature control includes the main pump 42, heater 43, three-way valve 52, three-way valve 61, piping 51e, branch point 62, three-way valve 63, three-way valve 68, branch point 66, three-way valve 65, radiator 48, branch Each three-way valve is controlled so that the circulation passes through point 69, three-way valve 67, and branch point 54 in this order.

Next, main operation modes of one embodiment will be explained.
[Heating operation + heater operation]
FIG. 8 is a diagram showing heating operation + heater operation.
In the figure, the flow path through which the low-pressure air-conditioning heat medium passes is shown by a thick dotted line, the flow path through which the high-pressure air-conditioning heat medium passes through is shown by a thick solid line, open on-off valves are shown in white, and closed valves are shown in white. The on-off valves are shown in black. Further, the flow path through which the temperature regulating heat medium passes is shown by a thick broken line.
Here, an explanation will be given of an operation in which heating operation is performed and the heater 43 is activated. When performing heating operation using the refrigeration cycle circuit 12, the outdoor expansion valve 23 is slightly opened, the on-off valve 32 is opened, the on-off valve 35 is closed, the indoor expansion valve 25 is closed, and the expansion valve 55 is closed. In this state, the compressor 21 is driven. On the other hand, in the temperature control circuit 41, the heater 43 is operated, the main pump 42 is driven, the sub-pump 49 is stopped, and the temperature control heat medium is circulated. In addition, the heat medium for temperature regulation is the heat for temperature regulation of the main pump 42, the heater 43, the three-way valve 52, the three-way valve 61, the piping 51e, the branch point 62, the three-way valve 63, the three-way valve 68, the branch point 66, and the heat exchanger 47. Each three-way valve is controlled so that the medium circulates through the medium flow path 47A, the three-way valve 67, and the branch point 54 in this order.

Thereby, the heat medium for air conditioning is compressor 21, radiator 22, branch point 34, outdoor expansion valve 23, outdoor heat exchanger 24, branch point 36, on-off valve 32, branch point 39, check valve 33, branch It circulates through point 57 and accumulator 27 in turn. Further, a part of the air conditioning heat medium that has passed through the radiator 22 is diverted from the branch point 34 to the air conditioning heat medium of the on-off valve 35, the branch point 37, the branch point 56, the expansion valve 55, and the heat exchanger 47. It joins the branch point 57 via the flow path 47B. In these circulation paths, the air-conditioning heat medium in the gas phase is compressed by the compressor 21 to become high pressure, and is condensed and liquefied by dissipating heat by the radiator 22, and becomes low temperature. The air-conditioning heat medium in the liquid phase is expanded by the outdoor expansion valve 23 to have a low pressure, and absorbs heat by the outdoor heat exchanger 24 to evaporate and vaporize to a high temperature. In addition, a part of the liquid phase air conditioning heat medium is expanded by the expansion valve 55 and has a low pressure, and absorbs heat in the air conditioning heat medium flow path 47B of the heat exchanger 47 to evaporate and become high temperature.

In addition, the heat medium for temperature control includes the heat for temperature control of the main pump 42, heater 43, three-way valve 52, three-way valve 61, piping 51e, branch point 62, three-way valve 63, three-way valve 68, branch point 66, and heat exchanger 47. The medium circulates through the medium flow path 47A, the three-way valve 67, and the branch point 54 in this order. In this circulation path, the heat medium for temperature adjustment becomes high temperature by absorbing heat by the heater 43, and becomes low temperature by dissipating heat in the heat medium flow path 47A for temperature adjustment of the heat exchanger 47.
On the other hand, the HVAC unit 13 drives the blower fan 14 and adjusts the proportion of air passing through the radiator 22 while closing the flow path 17 with the air mix damper 15. As a result, the introduced air is heated by the radiator 22, and warm air is supplied into the vehicle interior.

[Cooling operation + heater operation]
FIG. 9 is a diagram showing cooling operation + heater operation.
In the figure, the flow path through which the low-pressure air-conditioning heat medium passes is shown by a thick dotted line, the flow path through which the high-pressure air-conditioning heat medium passes through is shown by a thick solid line, open on-off valves are shown in white, and closed valves are shown in white. The on-off valves are shown in black. Further, the flow path through which the temperature regulating heat medium passes is indicated by a thick broken line.
Here, a description will be given of an operation other than heating, such as cooling operation, in which power is consumed by the heater 43 and heat is radiated by the radiator 48. When performing cooling operation using the refrigeration cycle circuit 12, the outdoor expansion valve 23 is fully opened, the on-off valve 32 is closed, the on-off valve 35 is closed, the indoor expansion valve 25 is slightly opened, and the expansion valve 55 is closed. In this state, the compressor 21 is driven. On the other hand, in the temperature control circuit 41, the heater 43 is operated, the main pump 42 is driven, the sub-pump 49 is stopped, and the temperature control heat medium is circulated. In addition, the heat medium for temperature control includes the main pump 42, heater 43, three-way valve 52, three-way valve 61, piping 51e, branch point 62, three-way valve 63, three-way valve 68, branch point 66, three-way valve 65, radiator 48, branch Each three-way valve is controlled so that the circulation passes through point 69, three-way valve 67, and branch point 54 in this order. Here, it has been explained that cooling operation is performed as an operation other than heating, but operations other than heating include stopping air conditioning operation.

Thereby, the heat medium for air conditioning is compressor 21, radiator 22, branch point 34, outdoor expansion valve 23, outdoor heat exchanger 24, branch point 36, check valve 38, branch point 37, branch point 56, indoor It circulates through the expansion valve 25, the heat absorber 26, the branch point 39, the check valve 33, the branch point 57, and the accumulator 27 in this order. In this circulation path, the air-conditioning heat medium in the gas phase is compressed by the compressor 21 to become high pressure, and is condensed and liquefied by dissipating heat in the outdoor heat exchanger 24, and becomes low temperature. The air conditioning heat medium in the liquid phase is expanded by the indoor expansion valve 25 to have a low pressure, and is evaporated by absorbing heat by the heat absorber 26 to become high temperature.
In addition, the heat medium for temperature control includes the main pump 42, heater 43, three-way valve 52, three-way valve 61, piping 51e, branch point 62, three-way valve 63, three-way valve 68, branch point 66, three-way valve 65, radiator 48, branch It circulates through the point 69, the three-way valve 67, and the branch point 54 in this order. In this circulation path, the heat medium for temperature adjustment becomes high temperature by absorbing heat by the heater 43, and becomes low temperature by dissipating heat by the radiator 48.
On the other hand, in the HVAC unit 13, while driving the blower fan 14, the flow path 16 is slightly closed by the air mix damper 15, and the ratio of bypassing the radiator 22 is adjusted. As a result, the introduced air is cooled by the heat absorber 26, and cool air is supplied into the vehicle interior.

[Heating operation + heater operation (radiator heat radiation)]
FIG. 10 is a diagram showing heating operation + heater operation (radiator heat radiation).
In the figure, the flow path through which the low-pressure air-conditioning heat medium passes is shown by a thick dotted line, the flow path through which the high-pressure air-conditioning heat medium passes through is shown by a thick solid line, open on-off valves are shown in white, and closed valves are shown in white. The on-off valves are shown in black. Further, the flow path through which the temperature regulating heat medium passes is shown by a thick broken line.
Here, an explanation will be given of an operation in which heating operation is performed, power is consumed by the heater 43, and heat is radiated by the radiator 48. When performing heating operation using the refrigeration cycle circuit 12, the outdoor expansion valve 23 is slightly opened, the on-off valve 32 is opened, the on-off valve 35 is closed, the indoor expansion valve 25 is closed, and the expansion valve 55 is closed. In this state, the compressor 21 is driven. On the other hand, in the temperature control circuit 41, the heater 43 is operated, the main pump 42 is driven, the sub-pump 49 is stopped, and the temperature control heat medium is circulated. In addition, the heat medium for temperature control includes the main pump 42, heater 43, three-way valve 52, three-way valve 61, piping 51e, branch point 62, three-way valve 63, three-way valve 68, branch point 66, three-way valve 65, radiator 48, branch Each three-way valve is controlled so that the circulation passes through point 69, three-way valve 67, and branch point 54 in this order.

Thereby, the heat medium for air conditioning is compressor 21, radiator 22, branch point 34, outdoor expansion valve 23, outdoor heat exchanger 24, branch point 36, on-off valve 32, branch point 39, check valve 33, branch It circulates through point 57 and accumulator 27 in turn. In this circulation path, the air-conditioning heat medium in the gas phase is compressed by the compressor 21 to become high pressure, and is condensed and liquefied by dissipating heat by the radiator 22, and becomes low temperature. The air-conditioning heat medium in the liquid phase is expanded by the outdoor expansion valve 23 to have a low pressure, and absorbs heat by the outdoor heat exchanger 24 to evaporate and vaporize to a high temperature.
In addition, the heat medium for temperature control includes the main pump 42, heater 43, three-way valve 52, three-way valve 61, piping 51e, branch point 62, three-way valve 63, three-way valve 68, branch point 66, three-way valve 65, radiator 48, branch It circulates through the point 69, the three-way valve 67, and the branch point 54 in this order. In this circulation path, the heat medium for temperature adjustment becomes high temperature by absorbing heat by the heater 43, and becomes low temperature by dissipating heat by the radiator 48.
On the other hand, the HVAC unit 13 drives the blower fan 14 and adjusts the proportion of air passing through the radiator 22 while closing the flow path 17 with the air mix damper 15. As a result, the introduced air is heated by the radiator 22, and warm air is supplied into the vehicle interior.

Next, supplementary explanations will be given regarding other operations.
[Battery heating operation]
FIG. 11 is a diagram showing the battery heating operation.
In the figure, the flow path through which the heat medium for temperature regulation passes is indicated by a thick broken line. Here, a battery warming operation that is performed when the temperature of the battery 45 is lower than a predetermined threshold will be described. The description of the refrigeration cycle circuit 12 will be omitted since it functions independently. In the temperature control circuit 41, the heater 43 is operated, the main pump 42 is driven, the sub pump 49 is stopped, and the temperature control heat medium is circulated. Further, the heat medium for temperature control passes through the main pump 42, heater 43, three-way valve 52, three-way valve 61, battery 45, branch point 62, three-way valve 63, three-way valve 68, branch point 53, and branch point 54 in order. Each three-way valve is controlled to circulate. In this circulation path, the heat medium for temperature adjustment becomes high temperature by absorbing heat by the heater 43, and becomes low temperature by dissipating heat by the battery 45. Thereby, the battery 45 is heated by the temperature controlling heat medium.

[Battery cooling operation]
FIG. 12 is a diagram showing the battery cooling operation.
In the figure, the flow path through which the heat medium for temperature regulation passes is indicated by a thick broken line. Here, a battery cooling operation performed when the temperature of the battery 45 is higher than a predetermined threshold will be described. The description of the refrigeration cycle circuit 12 will be omitted since it functions independently. In the temperature control circuit 41, the heater 43 is stopped, the main pump 42 is driven, the sub pump 49 is stopped, and the heat medium for temperature control is circulated. In addition, the heat medium for temperature control includes the main pump 42, heater 43, three-way valve 52, three-way valve 61, battery 45, branch point 62, three-way valve 63, three-way valve 68, branch point 66, three-way valve 65, radiator 48, branch Each three-way valve is controlled so that the circulation passes through point 69, three-way valve 67, and branch point 54 in this order. In this circulation path, the heat medium for temperature adjustment becomes high temperature by absorbing heat by the battery 45, and becomes low temperature by dissipating heat by the radiator 48. Thereby, the battery 45 is cooled by the temperature controlling heat medium.

[Auxiliary heating operation using heater]
FIG. 13 is a diagram showing heating auxiliary operation using the heater.
In the figure, the flow path through which the low-pressure air-conditioning heat medium passes is shown by a thick dotted line, the flow path through which the high-pressure air-conditioning heat medium passes through is shown by a thick solid line, open on-off valves are shown in white, and closed valves are shown in white. The on-off valves are shown in black. Further, the flow path through which the temperature regulating heat medium passes is shown by a thick broken line.
Here, the heating auxiliary operation using the heater 43 will be explained. When performing heating operation using the refrigeration cycle circuit 12, the outdoor expansion valve 23 is slightly opened, the on-off valve 32 is opened, the on-off valve 35 is closed, the indoor expansion valve 25 is closed, and the expansion valve 55 is closed. In this state, the compressor 21 is driven. On the other hand, in the temperature control circuit 41, the heater 43 is operated, the main pump 42 is driven, the sub-pump 49 is stopped, and the temperature control heat medium is circulated. Moreover, each three-way valve is controlled so that the heat medium for temperature adjustment circulates through the main pump 42, the heater 43, the three-way valve 52, the heater core 44, the branch point 53, and the branch point 54 in this order.

Thereby, the heat medium for air conditioning is compressor 21, radiator 22, branch point 34, outdoor expansion valve 23, outdoor heat exchanger 24, branch point 36, on-off valve 32, branch point 39, check valve 33, branch It circulates through point 57 and accumulator 27 in turn. In these circulation paths, the air-conditioning heat medium in the gas phase is compressed by the compressor 21 to become high pressure, and is condensed and liquefied by dissipating heat by the radiator 22, and becomes low temperature. The air-conditioning heat medium in the liquid phase is expanded by the outdoor expansion valve 23 to have a low pressure, and absorbs heat by the outdoor heat exchanger 24 to evaporate and vaporize to a high temperature.
Further, the temperature regulating heat medium circulates through the main pump 42, the heater 43, the three-way valve 52, the heater core 44, the branch point 53, and the branch point 54 in this order. In this circulation path, the heat medium for temperature adjustment becomes high temperature by absorbing heat by the heater 43, and becomes low temperature by dissipating heat by the heater core 44.
On the other hand, the HVAC unit 13 drives the blower fan 14 and adjusts the proportion of air passing through the radiator 22 while closing the flow path 17 with the air mix damper 15. As a result, the introduced air is heated by the radiator 22 and heated by the heater core 44, and even warmer air is supplied into the vehicle interior.

[Motor cooling operation]
FIG. 14 is a diagram showing the motor cooling operation.
In the figure, the flow path through which the heat medium for temperature regulation passes is indicated by a thick broken line. Here, a description will be given of a motor cooling operation that is executed when the temperature of the electric motor 46 is higher than a predetermined threshold. The description of the refrigeration cycle circuit 12 will be omitted since it functions independently. In the temperature control circuit 41, the heater 43 is stopped, the main pump 42 is stopped, and the sub pump 49 is driven to circulate the temperature control heat medium. Moreover, each three-way valve is controlled so that the heat medium for temperature regulation circulates through the sub-pump 49, the branch point 64, the electric motor 46, the three-way valve 65, the radiator 48, and the branch point 69 in this order. In this circulation path, the heat medium for temperature adjustment becomes high temperature by absorbing heat by the electric motor 46, and becomes low temperature by dissipating heat by the radiator 48. Thereby, the electric motor 46 is cooled by the temperature controlling heat medium.

From the above, the temperature control circuit 41 corresponds to a "warming circuit," the refrigeration cycle circuit 12 corresponds to a "refrigeration cycle circuit," the heater 43 corresponds to a "heater," and the heat exchanger 47 corresponds to a "heat exchanger circuit." ”, and the radiator 48 corresponds to “radiator”. The processing of steps S101 to S106 corresponds to the "circuit switching control section". The battery 45 corresponds to "power equipment" and "battery". The temperature control heat medium corresponds to the "warming heat medium".

《Effect》
Next, the main effects of one embodiment will be explained.
The battery 45 is charged by regeneration during driving, but since the battery 45 deteriorates when overcharged, regeneration cannot be performed when the battery 45 is fully charged. In order to prevent overcharging of the battery 45, it is common to use a discharging means such as a resistor circuit or an electric load, but this requires adding new components, so there is room for improvement.

Therefore, the heater 43 of the temperature control circuit 41 that controls the temperature of the battery 45 is used. That is, when the remaining capacity of the battery 45 is equal to or greater than the threshold value th (determination in step S101 is "Yes"), the heater 43 is activated (step S102). In this manner, when the remaining capacity of the battery 45 is equal to or greater than the threshold value th, the heater 43 of the temperature control circuit 41 is activated to consume the power of the battery 45. It is becoming common for the heater 43 of the temperature control circuit 41 to be installed in electric vehicles and hybrid vehicles. Therefore, the power of the battery 45 can be consumed by the existing components, and overcharging of the battery 45 can be suppressed. Further, the heat medium for temperature adjustment heated by the heater 43 is radiated by a heat exchanger 47 or a radiator 48 . Since both the heat exchanger 47 and the radiator 48 are generally attached to the temperature control circuit 41, heat can be reliably radiated using existing components.

Further, when heating is being performed in the refrigeration cycle circuit 12 (determination in step S103 is "Yes"), the heat medium for temperature adjustment heated by the heater 43 is radiated through the heat medium flow path 47A for temperature adjustment of the heat exchanger 47. (Step S105). On the other hand, when the refrigeration cycle circuit 12 is stopped or the cooling operation is performed (the determination in step S103 is "No"), the heat medium for temperature adjustment heated by the heater 43 is radiated by the radiator 48 (step S106). ). In this way, the circulation path of the temperature regulating heat medium is switched depending on the operation of the refrigeration cycle circuit 12, so that the heat of the temperature regulating heat medium can be appropriately radiated.
Furthermore, in normal heating operation, the outdoor heat exchanger 24 absorbs heat, and the greater the amount of heat absorbed by the outdoor heat exchanger 24, the more likely frost formation occurs. However, if the heater 43 is used to assist the heating operation, the amount of heat absorbed by the outdoor heat exchanger 24 can be reduced accordingly. Therefore, there is an effect of delaying frost formation on the outdoor heat exchanger 24.

Furthermore, even when the refrigeration cycle circuit 12 is performing heating operation (determination in step S103 is "Yes"), the temperature Tc of the temperature regulating heat medium at the outlet side of the temperature regulating heat medium flow path 47A of the heat exchanger 47 is the threshold value. When it is T1 or more (determination in step S104 is "No"), the heat medium for temperature adjustment heated by the heater 43 is caused to radiate heat by the radiator 48 (step S106). If the temperature Tc of the temperature regulating heat medium on the exit side of the temperature regulating heat medium flow path 47A of the heat exchanger 47 is high, it means that heat cannot be radiated sufficiently. In such a case, the temperature of the temperature regulating heat medium can be reliably lowered by causing the temperature regulating heat medium to radiate heat with the radiator 48.

Further, the temperature control circuit 41 is a circuit that circulates a temperature control heat medium in order to assist the heating of the refrigeration cycle circuit 12. It is becoming common for such a temperature control circuit 41 to be installed in electric vehicles and hybrid vehicles. Therefore, the power of the battery 45 can be consumed by the existing components, and overcharging of the battery 45 can be suppressed.
Further, the temperature control circuit 41 is also a circuit that circulates a heat medium for temperature control in order to heat the battery 45. It is becoming common for such a temperature control circuit 41 to be installed in electric vehicles and hybrid vehicles. Therefore, the power of the battery 45 can be consumed by the existing components, and overcharging of the battery 45 can be suppressed.

《Modified example》
In this embodiment, a configuration for heating and cooling the battery 45 has been described, but the configuration is not limited to this. That is, in this embodiment, since it is sufficient that the battery 45 can be at least heated, the configuration for cooling the battery 45 may be omitted.
In this embodiment, in the temperature control circuit 41, the flow of the heat medium for temperature control is switched by a three-way valve, but the present invention is not limited to this. For example, instead of providing a three-way valve, a two-way valve that can be opened and closed may be provided for each flow path, so that when one is opened, the other is closed, and when one is closed, the other is opened.
In this embodiment, a configuration has been described in which the outdoor expansion valve 23 is fully opened during cooling, but the configuration is not limited to this. For example, a bypass flow path that bypasses the outdoor expansion valve 23 may be provided, and this bypass flow path may be configured to be openable and closable. Thereby, pressure loss can be reduced by closing the outdoor expansion valve 23 and opening the bypass flow path during cooling.

Although the embodiments have been described above with reference to a limited number of embodiments, the scope of rights is not limited thereto, and modifications of the embodiments based on the above disclosure will be obvious to those skilled in the art.

DESCRIPTION OF SYMBOLS 11...Vehicle air conditioner, 12...Refrigerating cycle circuit, 13...HVAC unit, 14...Blower fan, 15...Air mix damper, 16...Flow path, 17...Flow path, 21...Compressor, 22...Radiator, 23... Outdoor expansion valve, 24... Outdoor heat exchanger, 25... Indoor expansion valve, 26... Heat absorber, 27... Accumulator, 28... Air blower, 31a... Piping, 31b... Piping, 31c... Piping, 31d... Piping, 31e... Piping, 31f... Piping, 31g... Piping, 31h... Piping, 32... On-off valve, 33... Check valve, 34... Branch point, 35... On-off valve, 36... Branch point, 37... Branch point, 38... Check valve , 39... Branch point, 41... Temperature control circuit, 42... Main pump, 43... Heater, 44... Heater core, 45... Battery, 46... Electric motor, 47... Heat exchanger, 47A... Heat medium flow path for temperature control, 47B ...Air conditioning heat medium flow path, 48...Radiator, 49...Sub pump, 51a...Piping, 51b...Piping, 51c...Piping, 51d...Piping, 51e...Piping, 51f...Piping, 51g...Piping, 51h...Piping, 51i... Piping, 51j... Piping, 52... Three-way valve, 53... Branch point, 54... Branch point, 55... Expansion valve, 56... Branch point, 57... Branch point, 61... Three-way valve, 62... Branch point, 63... Three-way valve , 64... Branch point, 65... Three-way valve, 66... Branch point, 67... Three-way valve, 68... Three-way valve, 69... Branch point, 71... Controller, 72... SOC acquisition unit, 73... Temperature sensor

Claims (5)

In a vehicle equipped with a battery that supplies power to an electric motor,
a heating circuit that circulates a heating medium;
A vehicular air conditioner comprising: a refrigeration cycle circuit that circulates an air conditioning heat medium to air condition a vehicle interior;
The heating circuit includes:
a heater that heats the heating medium;
a heat exchanger that exchanges heat with the air conditioning heat medium of the refrigeration cycle circuit;
a radiator that is provided in parallel with the heat exchanger and performs heat exchange with outside air,
comprising a circuit switching control unit that switches a circuit according to the remaining capacity of the battery that is regeneratively charged while the vehicle is running;
The circuit switching control section includes:
When the remaining capacity of the battery that is regeneratively charged while the vehicle is running is greater than or equal to a predetermined threshold, the heater is activated and the heated heating medium is heated in accordance with the operation of the refrigeration cycle circuit. An air conditioner for a vehicle, characterized in that air is circulated through either the heat exchanger or the radiator. The circuit switching control section includes:
When heating is performed in the refrigeration cycle circuit, the heated heating medium is circulated through the heat exchanger, and when cooling is performed in the refrigeration cycle circuit, the heated heating medium is circulated through the heat exchanger. 2. The vehicle air conditioner according to claim 1, wherein a heating medium is circulated through the radiator. The circuit switching control section includes:
When the operation of the refrigeration cycle circuit is heating and the temperature of the heating heat medium that has passed through the heat exchanger is equal to or higher than a predetermined threshold, the heated heat medium is transferred to the radiator. The vehicle air conditioner according to claim 2, wherein the air conditioner circulates the air. The heating circuit includes:
The vehicle air conditioner according to any one of claims 1 to 3, characterized in that the circuit circulates the heating heat medium to assist heating of the refrigeration cycle circuit. Equipped with electric power equipment that is installed in the vehicle and requires heating,
The heating circuit includes:
The vehicle air conditioner according to any one of claims 1 to 4, characterized in that the circuit circulates the heating heat medium in order to heat the electric power equipment.

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