CN113302440B - Air conditioner for vehicle - Google Patents

Air conditioner for vehicle Download PDF

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Publication number
CN113302440B
CN113302440B CN201980088846.6A CN201980088846A CN113302440B CN 113302440 B CN113302440 B CN 113302440B CN 201980088846 A CN201980088846 A CN 201980088846A CN 113302440 B CN113302440 B CN 113302440B
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China
Prior art keywords
air
refrigerant
expansion valve
opening degree
radiator
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CN201980088846.6A
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Chinese (zh)
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CN113302440A (en
Inventor
东宫武史
石関徹也
冈本佳之
松村尭之
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Sanden Corp
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Sanden Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/04—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in series
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
    • B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
    • B60H1/00899—Controlling the flow of liquid in a heat pump system
    • B60H1/00921—Controlling the flow of liquid in a heat pump system where the flow direction of the refrigerant does not change and there is an extra subcondenser, e.g. in an air duct
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H1/3204—Cooling devices using compression
    • B60H1/3205—Control means therefor
    • B60H1/3213—Control means therefor for increasing the efficiency in a vehicle heat pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
    • F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B6/00—Compression machines, plants or systems, with several condenser circuits
    • F25B6/04—Compression machines, plants or systems, with several condenser circuits arranged in series
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H2001/3236—Cooling devices information from a variable is obtained
    • B60H2001/3255—Cooling devices information from a variable is obtained related to temperature
    • B60H2001/3263—Cooling devices information from a variable is obtained related to temperature of the refrigerant at an evaporating unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H2001/3269—Cooling devices output of a control signal
    • B60H2001/3285—Cooling devices output of a control signal related to an expansion unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0403—Refrigeration circuit bypassing means for the condenser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0409—Refrigeration circuit bypassing means for the evaporator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/17—Speeds
    • F25B2700/171—Speeds of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

Provided is an air conditioner for a vehicle, which can improve the response of control by appropriately controlling the valve opening degree of each of a plurality of expansion valves. When the detected temperature of the heated air temperature sensor is lower than a target temperature, the controller adjusts the first expansion valve (23 a) in a direction to decrease the valve opening degree, and when the detected temperature of the heated air temperature sensor is lower than the target temperature in a state where the valve opening degree of the first expansion valve (23 a) is the minimum opening degree within a set range, the controller adjusts the second expansion valve (23 b) in a direction to increase the valve opening degree.

Description

Air conditioner for vehicle
Technical Field
The present invention relates to an air conditioner for a vehicle, which is applied to a vehicle such as an electric vehicle or a hybrid vehicle.
Background
Conventionally, in such a vehicle air conditioner, there is known an apparatus including: a compressor that compresses a refrigerant; a radiator that radiates heat of the refrigerant by exchanging heat with air supplied into the vehicle interior; a heat absorber that absorbs heat from the refrigerant by exchanging heat with air supplied into the vehicle interior; an outdoor heat exchanger that releases or absorbs heat from the refrigerant by exchanging heat with air outside the vehicle interior; a first expansion valve that decompresses refrigerant flowing into the outdoor heat exchanger; and a second expansion valve that depressurizes the refrigerant flowing into the heat absorber, wherein the apparatus performs dehumidification cooling in which the refrigerant discharged from the compressor is caused to flow through the radiator and the outdoor heat exchanger in order to release heat, and wherein the refrigerant that has released heat in the radiator and the outdoor heat exchanger is depressurized by the second expansion valve, and wherein the refrigerant depressurized by the second expansion valve absorbs heat in the heat absorber (see, for example, patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 5929372
Disclosure of Invention
Technical problem to be solved by the invention
In the vehicle air conditioner, the following control is performed: as the target outlet air temperature increases, the valve opening degree of the first expansion valve is increased, and the valve opening degree of the second expansion valve is decreased. In the vehicle air conditioning apparatus, since the first expansion valve and the second expansion valve are controlled simultaneously to make the state of the refrigerant flowing through the refrigerant circuit unstable, there is a possibility that the responsiveness of control for setting the temperature of the air supplied into the vehicle interior to the target outlet air temperature is lowered.
The invention aims to provide an air conditioner for a vehicle, which can improve the response of control by properly controlling the valve opening degree of a plurality of expansion valves.
Technical scheme for solving technical problem
In order to achieve the above object, an air conditioner for a vehicle according to the present invention includes: an air circulation path through which air supplied into the vehicle interior circulates; a compressor that compresses a refrigerant; a radiator that is provided in the air flow path and radiates heat of the refrigerant; a heat absorber that is provided in the air flow path and absorbs heat from the refrigerant; an outdoor heat exchanger disposed outside the vehicle compartment and configured to release or absorb heat from the refrigerant; a first expansion valve that decompresses refrigerant flowing into the outdoor heat exchanger; and a second expansion valve that reduces the pressure of the refrigerant flowing into the heat absorber, wherein the vehicle air-conditioning apparatus performs dehumidification cooling in which the refrigerant discharged from the compressor is caused to flow through the radiator and the outdoor heat exchanger in order to release heat, and the refrigerant that has released heat in the radiator and the outdoor heat exchanger is reduced in pressure by the second expansion valve, and the refrigerant that has been reduced in pressure by the second expansion valve absorbs heat in the heat absorber, the vehicle air-conditioning apparatus comprising: a radiator temperature acquisition unit that acquires a temperature of a radiator; and a control unit that adjusts the first expansion valve in a direction to decrease the valve opening degree when the temperature acquired by the radiator temperature acquisition unit is lower than a target temperature, and that adjusts the second expansion valve in a direction to increase the valve opening degree when the temperature acquired by the radiator temperature acquisition unit is lower than the target temperature when the valve opening degree of the first expansion valve is a minimum opening degree within a set range.
In this way, since the valve opening degree of the second expansion valve is adjusted after the valve opening degree of the first expansion valve is adjusted, the valve opening degrees of the first expansion valve and the second expansion valve are adjusted in a state where the state of the refrigerant flowing through the refrigerant circuit is stable.
Effects of the invention
According to the present invention, since the valve opening degrees of the first expansion valve and the second expansion valve can be adjusted in a state in which the state of the refrigerant flowing through the refrigerant circuit is stabilized, the responsiveness of control for setting the temperature of the air supplied into the vehicle interior to the target outlet air temperature can be improved.
Drawings
Fig. 1 is a schematic configuration diagram showing a vehicle air conditioner according to an embodiment of the present invention.
Fig. 2 is a block diagram showing a control system.
Fig. 3 is a schematic configuration diagram of a vehicle air conditioner showing a flow path of a refrigerant during heating operation.
Fig. 4 is a schematic configuration diagram of the vehicle air conditioner showing the flow path of the refrigerant during the second dehumidification and heating operation.
Fig. 5 is a flowchart showing the blowing temperature control process.
Detailed Description
Fig. 1 to 5 show an embodiment of the present invention.
The air conditioner 1 for a vehicle according to the present invention is applied to a vehicle that can travel by the driving force of an electric motor, such as an electric vehicle or a hybrid vehicle.
As shown in fig. 1, the air conditioner 1 for a vehicle includes: an air conditioning unit 10 provided in a vehicle cabin of a vehicle; and a refrigerant circuit 20 provided across the vehicle interior and the vehicle exterior.
The air conditioning unit 10 has an air flow path 11 for circulating air supplied into the vehicle interior. An outside air inlet 11a and an inside air inlet 11b are provided at one end of the air flow path 11, the outside air inlet 11a allowing air outside the vehicle compartment to flow into the air flow path 11, and the inside air inlet 11b allowing air inside the vehicle compartment to flow into the air flow path 11. On the other end side of the air flow path 11, a foot outlet, not shown, that blows air flowing through the air flow path 11 toward the feet of the passenger, a natural wind, not shown, that blows air flowing through the air flow path 11 toward the upper body of the passenger, and a defogging outlet, not shown, that blows air flowing through the air flow path 11 toward the surface of the front windshield of the vehicle on the vehicle interior side are provided.
An indoor air blower 12 such as a sirocco fan for circulating air from one end side to the other end side of the air flow path 11 is provided at one end side in the air flow path 11.
A suction port switching damper 13 is provided at one end of the air flow path 11, and the suction port switching damper 13 can open one of the outside air suction port 11a and the inside air suction port 11b and close the other. The suction port switching damper 13 can switch an external air supply mode in which the internal air suction port 11b is closed and the external air suction port 11a is opened, an internal air circulation mode in which the external air suction port 11a is closed and the internal air suction port 11b is opened, and an internal external air suction mode in which the external air suction port 11a and the internal air suction port 11b are opened by being positioned between the external air suction port 11a and the internal air suction port 11b, respectively.
A heat absorber 14 is provided on the downstream side of the air flow direction of the indoor fan 12 in the air flow path 11, and the heat absorber 14 cools and dehumidifies the air flowing through the air flow path 11. Further, a radiator 15 is provided on the downstream side of the heat absorber 14 in the air flow direction in the air flow path 11, and the radiator 15 heats the air flowing through the air flow path 11.
The radiator 15 is disposed on one side in the direction orthogonal to the air flow path 11, and a radiator bypass flow path 11c bypassing the radiator 15 is formed on the other side in the direction orthogonal to the air flow path 11. An air heater 16 is provided on the downstream side in the air flow direction of the radiator 15 in the air flow path 11, and the air heater 16 heats air supplied into the vehicle interior.
An air mixing damper 17 is provided between the heat absorber 14 and the radiator 15 in the air flow path 11, and the air mixing damper 17 adjusts the ratio of air heated by the radiator 15 in the air flowing through the heat absorber 14. The air mix damper 17 closes one of the radiator bypass flow path 11c and the radiator 15 to the upstream side in the air flow direction of the radiator 15 and the radiator bypass flow path 11c and opens the other, or opens both of the radiator bypass flow path 11c and the radiator 15, and adjusts the opening degree of the radiator 15 to the upstream side in the air flow direction. The air mix damper 17 has an opening degree of 0% in a state where the upstream side in the air flow direction of the radiator 15 in the air flow path 11 is closed and the radiator bypass flow path 11c is opened, and has an opening degree of 100% in a state where the upstream side in the air flow direction of the radiator 15 in the air flow path 11 is opened and the radiator bypass flow path 11c is closed.
The refrigerant circuit 20 includes: the heat sink 14; the heat spreader 15; a compressor 21 for compressing a refrigerant; an outdoor heat exchanger 22 for heat-exchanging refrigerant with air outside the vehicle interior; a first electronic expansion valve 23a and a second electronic expansion valve 23b that can adjust the valve opening between full-closed and full-open states; a first solenoid valve 24a and a second solenoid valve 24b for opening and closing a flow path of the refrigerant; a first check valve 25a and a second check valve 25b for restricting the direction of refrigerant flow in the refrigerant flow path; and an accumulator tank 26 for separating the gaseous refrigerant from the liquid refrigerant and sucking the gaseous refrigerant into the compressor 21, which are connected by, for example, aluminum pipes or copper pipes. As the refrigerant flowing through the refrigerant circuit 20, for example, R-134a or the like is used.
The outdoor heat exchanger 22 is disposed outside the vehicle such as an engine compartment so that the direction of air heat-exchanged with the refrigerant flows in the front-rear direction of the vehicle. An outdoor fan 22a is provided in the vicinity of the outdoor heat exchanger 22, and the outdoor fan 22a circulates air outside the vehicle in the front-rear direction when the vehicle is stopped.
Specifically describing the configuration of the refrigerant circuit 20, the refrigerant flow path 20a is formed by connecting the refrigerant inflow side of the radiator 15 to the refrigerant discharge side of the compressor 21. The refrigerant flow path 20b is formed by connecting the refrigerant inflow side of the outdoor heat exchanger 22 to the refrigerant outflow side of the radiator 15. The refrigerant circulation path 20b is provided with a first expansion valve 23a. The refrigerant inflow side of heat absorber 14 is connected to the refrigerant outflow side of outdoor heat exchanger 22, thereby forming refrigerant flow path 20c. The refrigerant circulation path 20c is provided with a first check valve 25a and a second expansion valve 23b in this order from the outdoor heat exchanger 22 side. The refrigerant flow path 20d is formed by connecting the refrigerant suction side of the compressor 21 to the refrigerant outflow side of the heat absorber 14. In refrigerant flow path 20d, second check valve 25b and accumulator 26 are provided in this order from the heat absorber 14 side. The refrigerant flow path 20e is formed by bypassing the outdoor heat exchanger 22 and connecting the space between the first check valve 25a and the second expansion valve 23b of the refrigerant flow path 20c to the space between the radiator 15 and the first expansion valve 23a of the refrigerant flow path 20b. The refrigerant circulation path 20e is provided with a first solenoid valve 24a. Refrigerant flow path 20f is formed by connecting the portion between heat absorber 14 and second check valve 25b in refrigerant flow path 20d to the portion between outdoor heat exchanger 22 and first check valve 25a in refrigerant flow path 20c. The refrigerant circulation path 20f is provided with a second solenoid valve 24b.
The vehicle air conditioner 1 includes a controller 30 as a control unit, and the controller 30 controls the temperature and the humidity in the vehicle interior to be set temperatures and humidities.
The controller 30 has a CPU, ROM, and RAM. When the controller 30 receives an input signal from a device connected to the input side, the CPU reads a program stored in the ROM based on the input signal, and stores a state detected from the input signal in the RAM or transmits an output signal to a device connected to the output side.
As shown in fig. 2, to the input side of the controller 30 are connected: an outside air temperature sensor 31 for detecting a temperature Tam outside the vehicle compartment; an inside air temperature sensor 32 for detecting a temperature Tr inside the vehicle compartment; an intake air temperature sensor 33 for detecting a temperature Ti of the air flowing into the air circulation path 11; a cooling air temperature sensor 34 for detecting a temperature Te of air cooled by the heat absorber 14; a heated air temperature sensor 35 as a radiator temperature acquisition unit for detecting the temperature Tc of the air heated in the radiator 15; an internal air humidity sensor 36 for detecting humidity Rh in the vehicle interior; a refrigerant temperature sensor 37 for detecting a temperature Thex of the refrigerant heat-exchanged in the outdoor heat exchanger 22; a solar radiation sensor 38, for example, of a photosensor type, for detecting a solar radiation amount Ts; a speed sensor 39 for detecting a speed V of the vehicle; a pressure sensor 40 for detecting a pressure Pd on the high-pressure side of the refrigerant circuit 20; a setting operation unit 41 for setting a set temperature Tset in the vehicle interior operated by the passenger and setting related to switching of the operation contents of the air conditioner.
As shown in fig. 2, the air heater 16, the compressor 21, the first and second expansion valves 23a and 23b, and the first and second solenoid valves 24a and 24b are connected to the output side of the controller 30.
In the vehicle air conditioning apparatus 1 configured as described above, the temperature and humidity of the air in the vehicle interior are adjusted using the air conditioning unit 10 and the refrigerant circuit 20. Specifically, the vehicle air conditioner 1 performs: cooling operation for lowering the temperature in the vehicle interior; a dehumidification cooling operation for lowering the humidity and lowering the temperature in the vehicle interior; heating operation for raising the temperature in the vehicle interior; and a first dehumidification and heating operation and a second dehumidification and heating operation that lower the humidity and raise the temperature in the vehicle interior.
When the cooling operation is performed, the indoor fan 12 is driven and the air mix damper 17 is set to an opening degree of 0% in the air conditioning unit 10. In the refrigerant circuit 20, the compressor 21 is driven in a state in which the first expansion valve 23a is fully opened, the second expansion valve 23b is set to a predetermined valve opening degree, and the first solenoid valve 24a and the second solenoid valve 24b are closed.
As a result, in the refrigerant circuit 20, the refrigerant discharged from the compressor 21 flows through the radiator 15, the first expansion valve 23a having a fully opened valve opening degree, the outdoor heat exchanger 22, the second expansion valve 23b having a predetermined valve opening degree, and the heat absorber 14 in this order as shown in fig. 1, and is then sucked into the compressor 21.
Since the opening degree of the air mixing damper 17 is 0%, the refrigerant flowing through the refrigerant circuit 20 does not release heat in the radiator 15, but releases heat in the outdoor heat exchanger 22, is reduced in pressure in the second expansion valve 23b, and absorbs heat in the heat absorber 14.
The air flowing through the air flow path 11 is cooled to the target outlet air temperature TAO by heat exchange with the refrigerant that has absorbed heat in the heat absorber 14, and is blown out into the vehicle interior.
In addition, when the dehumidification cooling operation is performed, the opening degree of the air mixing damper 17 of the air conditioning unit 10 is set to an opening degree greater than 0% in the refrigerant flow path of the refrigerant circuit 20 during the cooling operation.
Thus, the refrigerant flowing through the refrigerant circuit 20 releases heat in the radiator 15 and the outdoor heat exchanger 22, is reduced in pressure in the second expansion valve 23b, and absorbs heat in the heat absorber 14.
The air flowing through the air flow path 11 is dehumidified and cooled by heat exchange with the refrigerant that has absorbed heat in the heat absorber 14, heated by the heat exchanger with the refrigerant that has dissipated heat in the radiator 15, adjusted to the target outlet air temperature TAO, and then blown out into the vehicle interior.
In the case of performing the heating operation, the indoor fan 12 is driven and the opening degree of the air mix damper 17 is set to an opening degree greater than 0% in the air conditioning unit 10. In the refrigerant circuit 20, the compressor 21 is driven in a state in which the first expansion valve 23a is opened to a predetermined valve opening degree smaller than the full opening, the second expansion valve 23b is closed, the first solenoid valve 24a is closed, and the second solenoid valve 24b is opened.
As a result, in the refrigerant circuit 20, the refrigerant discharged from the compressor 21 flows through the radiator 15, the first expansion valve 23a having a predetermined valve opening degree, and the outdoor heat exchanger 22 in this order as shown in fig. 3, and is then sucked into the compressor 21.
The refrigerant flowing through the refrigerant circuit 20 releases heat in the radiator 15, is reduced in pressure in the first expansion valve 23a, and absorbs heat in the outdoor heat exchanger 22.
The air flowing through the air flow path 11 is heated by heat exchange with the refrigerant that has dissipated heat in the heat absorber 15, is adjusted to the target outlet air temperature TAO, and is then blown out into the vehicle interior.
In the case where the first dehumidification and heating operation is performed, the indoor blower 12 is driven and the opening degree of the air mix damper 17 is set to an opening degree greater than 0% in the air conditioning unit 10. In the refrigerant circuit 20, the compressor 21 is driven in a state in which the first expansion valve 23a and the second expansion valve 23b are set to a predetermined valve opening degree smaller than the full opening, and the first solenoid valve 24a and the second solenoid valve 24b are closed.
As a result, in the refrigerant circuit 20, the refrigerant discharged from the compressor 21 flows through the radiator 15, the first expansion valve 23a having a predetermined valve opening degree, the outdoor heat exchanger 22, the second expansion valve 23b having a predetermined valve opening degree, and the heat absorber 14 in this order as shown in fig. 1, and is then sucked into the compressor 21.
The refrigerant flowing through the refrigerant circuit 20 releases heat in the radiator 15, is reduced in pressure in the first expansion valve 23a, absorbs heat in the outdoor heat exchanger 22, is reduced in pressure in the second expansion valve 23b, and absorbs heat in the heat absorber 14.
The air flowing through the air flow path 11 of the air conditioning unit 10 is dehumidified and cooled by heat exchange with the refrigerant that absorbs heat in the heat absorber 14, heated by heat exchange with the refrigerant that radiates heat in the radiator 15, and then blown out into the vehicle interior after being adjusted to the target blow-out temperature TAO.
In the case where the second dehumidification and heating operation is performed, the indoor fan 12 is driven and the air mix damper 17 is set to an opening degree greater than 0% in the air conditioning unit 10. In the refrigerant circuit 20, the compressor 21 is driven in a state where the first expansion valve 23a is closed, the second expansion valve 23b is set to a predetermined valve opening degree, the first solenoid valve 24a is opened, and the second solenoid valve 24b is closed.
Thus, in the refrigerant circuit, the refrigerant discharged from the compressor 21 flows through the radiator 15, the second expansion valve 23b having a predetermined valve opening degree, and the heat absorber 14 in this order as shown in fig. 4, and is then sucked into the compressor 21.
The refrigerant flowing through the refrigerant circuit 20 releases heat in the radiator 15, is reduced in pressure in the second expansion valve 23b, and absorbs heat in the heat absorber 14.
The air flowing through the air flow path 11 of the air conditioning unit 10 is cooled by heat exchange with the refrigerant that absorbs heat in the heat absorber 14, heated by heat exchange with the refrigerant that releases heat in the radiator 15, adjusted to the target outlet air temperature TAO, and then blown out into the vehicle interior.
Further, the controller 30 performs an outlet air temperature control process so that the temperature of the air supplied into the vehicle interior becomes the target outlet air temperature TAO during the dehumidification cooling operation. The operation of the controller 30 at this time will be described with reference to the flowchart of fig. 5.
(step S1)
In step S1, the CPU determines whether or not the dehumidification cooling operation is being performed. When it is determined that the dehumidification cooling operation is being performed, the process proceeds to step S2, and when it is not determined that the dehumidification cooling operation is being performed, the outlet air temperature control process is ended.
(step S2)
When it is determined in step S1 that the dehumidification cooling operation is being performed, the CPU determines in step S2 whether or not the detected temperature T of the heated air temperature sensor 35 is less than the target heated air temperature TCO. If it is determined that the detected temperature T of the heated air temperature sensor 35 is less than the target heated air temperature TCO, the process proceeds to step S3, and if it is not determined that the detected temperature T of the heated air temperature sensor 35 is less than the target heated air temperature TCO, the outlet air temperature control process is ended.
Here, the target heated air temperature TCO is the heating temperature of the air in the radiator 15 required to set the temperature of the air supplied into the vehicle interior to the target blowing temperature TAO.
(step S3)
When it is determined in step S2 that the detected temperature T of the heated air temperature sensor 35 is less than the target heated air temperature TCO, the CPU decreases the opening degree of the first expansion valve 23a by a predetermined opening degree in step S3, and the process proceeds to step S4.
Here, in the refrigerant circuit 20, the opening degree of the first expansion valve 23a is decreased to increase the pressure on the high-pressure side including the radiator 15, thereby increasing the temperature of the refrigerant in the radiator 15.
(step S4)
In step S4, the CPU determines whether the detected temperature T of the heated air temperature sensor 35 is less than the target heated air temperature TCO. If it is determined that the detected temperature T of the heated air temperature sensor 35 is less than the target heated air temperature TCO, the process proceeds to step S5, and if it is not determined that the detected temperature T of the heated air temperature sensor 35 is less than the target heated air temperature TCO, the outlet air temperature control process is ended.
(step S5)
When it is determined in step S4 that the detected temperature T of the heating air temperature sensor 35 is less than the target heating air temperature TCO, the CPU determines in step S5 whether or not the opening degree of the first expansion valve 23a is the minimum opening degree within the set range. The process proceeds to step S6 when it is determined that the opening degree of the first expansion valve 23a is the minimum opening degree within the set range, and the process proceeds to step S3 when it is not determined that the opening degree of the first expansion valve 23a is the minimum opening degree within the set range.
(step S6)
When it is determined in step S5 that the opening degree of the first expansion valve 23a is the minimum opening degree within the settable range, the CPU increases the opening degree of the second expansion valve 23b by a predetermined opening degree in step S6, and the process proceeds to step S7.
Here, in the refrigerant circuit 20, the valve opening degree of the second expansion valve 23b is increased, so that the refrigerant between the first expansion valve 23a and the second expansion valve 23b in the refrigerant circuit 20 flows on the refrigerant suction side of the compressor 21.
(step S7)
In step S7, the CPU increases the rotation speed of the compressor 21 by a predetermined rotation speed, and the process proceeds to step S8.
Here, in the refrigerant circuit 20, since the discharge amount of the refrigerant of the compressor 21 increases, the pressure on the high-pressure side including the radiator 15 becomes high, and the temperature of the refrigerant in the radiator 15 becomes high.
(step S8)
In step S8, the CPU determines whether the detected temperature T of the heated air temperature sensor 35 is less than the target heated air temperature TCO. If it is determined that the detected temperature T of the heated air temperature sensor 35 is less than the target heated air temperature TCO, the process proceeds to step S9, and if it is not determined that the detected temperature T of the heated air temperature sensor 35 is less than the target heated air temperature TCO, the outlet air temperature control process is ended.
(step S9)
When it is determined in step S8 that the detected temperature T of the heating air temperature sensor 35 is less than the target heating air temperature TCO, the CPU determines in step S9 whether or not the opening degree of the second expansion valve 23b is the maximum opening degree within the set range. When it is determined that the opening degree of the second expansion valve 23b is the maximum opening degree within the set range, the process proceeds to step S10, and when it is not determined that the opening degree of the second expansion valve 23b is the minimum opening degree within the set range, the process proceeds to step S6.
Here, the maximum opening degree of the second expansion valve 23b within the set range is an opening degree larger than the opening degree of the second expansion valve 23b in the first dehumidification and heating and the second dehumidification and heating.
(step S10)
When it is determined in step S9 that the opening degree of the second expansion valve 23b is the maximum opening degree within the settable range, the CPU switches the operation state from the dehumidification cooling operation to the dehumidification heating operation in step S10, and ends the outlet air temperature control process.
As described above, according to the air conditioner for a vehicle of the present embodiment, the controller 30 adjusts the first expansion valve 23a in the direction of decreasing the valve opening degree when the detected temperature T of the heated air temperature sensor 35 is lower than the target temperature, and the controller 30 adjusts the second expansion valve 23b in the direction of increasing the valve opening degree when the detected temperature T of the heated air temperature sensor 35 is lower than the target temperature in the state where the valve opening degree of the first expansion valve 23a is the minimum opening degree within the set range.
Accordingly, since the valve opening degrees of the first expansion valve 23a and the second expansion valve 23b can be adjusted in a state in which the state of the refrigerant flowing through the refrigerant circuit 20 is stabilized, the responsiveness of control for setting the temperature of the air supplied into the vehicle interior to the target blowout temperature TAO can be improved.
Further, the controller 30 adjusts the second expansion valve 23b in a direction of increasing the valve opening degree, and adjusts the compressor 21 in a direction of increasing the rotation speed.
Thus, by increasing the discharge amount of the refrigerant from the compressor 21, the refrigerant between the first expansion valve 23a and the second expansion valve 23b can be pressure-fed to the refrigerant discharge side of the compressor 21, and the pressure in the radiator 15 can be increased.
Further, when the detected temperature T of the heating air temperature sensor 35 is lower than the target temperature in a state where the valve opening degree of the second expansion valve 23b is the maximum opening degree of the set range, the controller 30 executes the first dehumidification heating or the second dehumidification heating.
Accordingly, when the amount of heat released in the heat radiator 15 during dehumidification cooling is insufficient, the air heater 16 does not need to be driven by executing the first dehumidification and heating operation or the second dehumidification and heating operation, and thus, the amount of power consumption can be reduced.
The maximum opening degree of the set range of the second expansion valve 23b is larger than the opening degree of the second expansion valve 23b during dehumidification and heating.
This enables the pressure in the radiator 15 to be increased to the maximum during the dehumidification cooling operation, thereby reducing the frequency of use of the air heater 16.
In addition, the above embodiment has the following configuration: the temperature Tc of the air heated in the radiator 15 is acquired as the temperature of the radiator 15, and the operations of the compressor 21, the first expansion valve 23a, and the second expansion valve 23b are controlled based on the acquired temperature of the radiator 15. The temperature of the radiator 15 can be obtained based on the temperature Tc of the air heated in the radiator 15, and can also be obtained based on, for example, the surface temperature of the radiator 15, the temperature and pressure of the refrigerant in the radiator 15, the drive voltage of the electric motor that drives the indoor air-sending device 12, the flow rate of the air flowing through the air flow path 11, and the like.
In the above embodiment, the opening degree of the second expansion valve 23b is increased by the predetermined opening degree in step S6, and the rotation speed of the compressor 21 is increased by the predetermined rotation speed in step S7, but the opening degree of the second expansion valve 23b may be increased by the predetermined opening degree after the rotation speed of the compressor 21 is increased by the predetermined rotation speed.
(description of symbols)
1. An air conditioning device for a vehicle;
11. an air flow path;
14. a heat sink;
15. a heat releasing device;
20. a refrigerant circuit;
21. a compressor;
22. an outdoor heat exchanger;
23a first expansion valve;
23b a second expansion valve;
30. a controller;
35. a heated air temperature sensor.

Claims (4)

1. An air conditioning device for a vehicle, comprising:
an air circulation path through which air supplied into the vehicle interior circulates;
a compressor that compresses a refrigerant;
a radiator that is provided in the air flow path and radiates heat of the refrigerant;
a heat absorber that is provided in the air flow path and absorbs heat from the refrigerant;
an outdoor heat exchanger disposed outside the vehicle compartment and adapted to release or absorb heat from the refrigerant;
a first expansion valve that decompresses refrigerant flowing into the outdoor heat exchanger; and
a second expansion valve that reduces the pressure of the refrigerant flowing into the heat absorber,
the vehicle air conditioner performs dehumidification cooling in which a refrigerant discharged from a compressor is circulated in sequence through a radiator and an outdoor heat exchanger to radiate heat, the refrigerant that has radiated heat in the radiator and the outdoor heat exchanger is decompressed by a second expansion valve, the refrigerant decompressed by the second expansion valve absorbs heat in a heat absorber,
it is characterized in that the preparation method is characterized in that,
the air conditioning device for a vehicle includes:
a radiator temperature acquisition unit that acquires a temperature of a radiator; and
and a control unit that adjusts the first expansion valve in a direction to decrease the valve opening degree when the temperature acquired by the radiator temperature acquisition unit is lower than a target temperature, and adjusts the second expansion valve in a direction to increase the valve opening degree when the temperature acquired by the radiator temperature acquisition unit is lower than the target temperature when the valve opening degree of the first expansion valve is a minimum opening degree within a set range.
2. The air conditioner for vehicles according to claim 1,
the control unit adjusts the second expansion valve in a direction of increasing the valve opening degree, and adjusts the compressor in a direction of increasing the rotation speed.
3. The air conditioning device for vehicles according to claim 1 or 2,
when the temperature acquired by the radiator temperature acquisition unit is lower than a target temperature in a state where the valve opening degree of the second expansion valve is the maximum opening degree of the set range, the control unit executes dehumidification heating in which the refrigerant discharged from the compressor is made to radiate heat in the radiator and absorb heat only in the heat absorber or in the heat absorber and the outdoor heat exchanger.
4. A vehicular air-conditioning apparatus according to claim 3,
the maximum opening degree of the set range of the second expansion valve is larger than the opening degree of the second expansion valve during dehumidification and heating.
CN201980088846.6A 2019-01-17 2019-12-12 Air conditioner for vehicle Active CN113302440B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2019006016A JP2020115049A (en) 2019-01-17 2019-01-17 Vehicular air conditioner
JP2019-006016 2019-01-17
PCT/JP2019/048670 WO2020149064A1 (en) 2019-01-17 2019-12-12 Vehicular air conditioner

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CN113302440A CN113302440A (en) 2021-08-24
CN113302440B true CN113302440B (en) 2022-12-23

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JP (1) JP2020115049A (en)
CN (1) CN113302440B (en)
DE (1) DE112019006675T5 (en)
WO (1) WO2020149064A1 (en)

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JP2020115049A (en) 2020-07-30
CN113302440A (en) 2021-08-24
DE112019006675T5 (en) 2021-10-07

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