WO2021020161A1 - Climatiseur de véhicule - Google Patents

Climatiseur de véhicule Download PDF

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Publication number
WO2021020161A1
WO2021020161A1 PCT/JP2020/027792 JP2020027792W WO2021020161A1 WO 2021020161 A1 WO2021020161 A1 WO 2021020161A1 JP 2020027792 W JP2020027792 W JP 2020027792W WO 2021020161 A1 WO2021020161 A1 WO 2021020161A1
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WO
WIPO (PCT)
Prior art keywords
heat medium
refrigerant
heat
air
flow passage
Prior art date
Application number
PCT/JP2020/027792
Other languages
English (en)
Japanese (ja)
Inventor
徹也 石関
大典 荒木
Original Assignee
サンデン・オートモーティブクライメイトシステム株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by サンデン・オートモーティブクライメイトシステム株式会社 filed Critical サンデン・オートモーティブクライメイトシステム株式会社
Priority to DE112020003640.5T priority Critical patent/DE112020003640T5/de
Priority to CN202080052352.5A priority patent/CN114126901B/zh
Publication of WO2021020161A1 publication Critical patent/WO2021020161A1/fr

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    • 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
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • 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
    • B60H1/00007—Combined heating, ventilating, or cooling devices
    • B60H1/00021—Air flow details of HVAC devices
    • B60H1/00035—Air flow details of HVAC devices for sending an air stream of uniform temperature into the passenger compartment
    • B60H1/0005—Air flow details of HVAC devices for sending an air stream of uniform temperature into the passenger compartment the air being firstly cooled and subsequently heated or vice versa
    • 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
    • B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
    • B60H1/00278—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit for the battery
    • 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
    • B60H1/00885—Controlling the flow of heating or cooling liquid, e.g. valves or pumps
    • 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
    • B60H1/3228—Cooling devices using compression characterised by refrigerant circuit configurations
    • B60H1/32281—Cooling devices using compression characterised by refrigerant circuit configurations comprising a single secondary circuit, e.g. at evaporator or condenser side
    • 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
    • B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
    • B60H2001/00307—Component temperature regulation using a liquid flow
    • 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
    • B60H2001/00928—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 comprising a secondary circuit
    • 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
    • B60H2001/3286—Constructional features
    • B60H2001/3288—Additional heat source

Definitions

  • the present invention relates to a vehicle air conditioner applied to a vehicle such as an electric vehicle or a hybrid vehicle.
  • a compressor that compresses and discharges a refrigerant and a heat radiating device that is provided on the vehicle interior side and functions as a condenser that dissipates the refrigerant.
  • a device a heat absorber provided on the vehicle interior side that functions as an endothermic that absorbs the refrigerant, and an outdoor heat exchange that is installed on the outside of the vehicle interior and functions as an evaporator that absorbs the refrigerant by the ventilated outside air or a condenser that dissipates heat. It has a refrigerant circuit to which the vessel is connected.
  • This air conditioner has a "heating mode” in which the refrigerant discharged from the compressor is dissipated in the radiator and the refrigerant dissipated in the radiator is absorbed in the outdoor heat exchanger, and the refrigerant discharged from the compressor is exposed to outdoor heat.
  • "Cooling mode” in which heat is dissipated in the exchanger and heat is absorbed in the heat exchanger
  • dehumidifying heating in which the refrigerant discharged from the compressor is dissipated in the radiator and the refrigerant dissipated in the radiator is absorbed in the heat absorber and the outdoor heat exchanger.
  • Each air conditioning mode can be switched, such as “mode” and “dehumidifying / cooling mode” in which the refrigerant discharged from the compressor is dissipated in the radiator and the outdoor heat exchanger and the heat is absorbed in the heat absorber.
  • the air conditioner of Patent Document 1 includes a circulation pump, a heat medium heating device (ECH), and a vehicle interior as means for realizing an auxiliary heating function when the outside temperature is low (for example, 0 ° C. or lower). It is provided with a heat medium circulation circuit including a heat medium provided in the air flow passage on the air upstream side of the radiator with respect to the air flow in the air flow passage through which the supplied air flows-an air heat exchanger. ..
  • a heat medium circulation circuit including a heat medium provided in the air flow passage on the air upstream side of the radiator with respect to the air flow in the air flow passage through which the supplied air flows-an air heat exchanger. ..
  • the heat medium circulated by the circulation pump is heated by the heat medium heating device, and the heat medium-air heat exchanger provided in the air flow passage serves as a heater core to assist the heating operation. ..
  • the heater output is the maximum output.
  • the drive is limited so that it is about 50%.
  • An object of the present invention is to provide an air conditioner for a vehicle capable of improving the heating performance while suppressing deterioration of the durability of the heat medium heating device as much as possible, for the purpose of solving the conventional problems.
  • the vehicle air conditioner according to the present invention includes an air flow passage through which air supplied to the vehicle interior flows, a compressor that compresses the refrigerant, a radiator that dissipates the refrigerant, and the like.
  • a refrigerant circuit including a heat absorber that absorbs heat from the refrigerant, an outdoor heat exchanger that is provided outside the vehicle interior to dissipate or absorb heat of the refrigerant, a heat medium heating device that heats the heat medium, and a heat medium heating device that is provided in the air flow passage.
  • An auxiliary heating unit that includes a heat exchanger in the air flow passage that dissipates heat from the heat medium and circulates the heat medium heated by the heat medium heating device, and is formed between the outdoor heat exchanger and the heat absorber.
  • a heat medium-refrigerant heat exchanger that absorbs heat from the refrigerant that is branched and circulated from the first refrigerant flow passage to exchange heat with the heat medium, and the control device are used for air conditioning operation using the refrigerant circuit.
  • the air conditioning operation execution judgment unit that determines whether or not to add the auxiliary heating function, the auxiliary heating execution judgment unit that determines whether or not to add the auxiliary heating function, and the air conditioning operation execution judgment unit can perform air conditioning operation using the refrigerant circuit.
  • the drive control unit that limits the output of the heat medium heating device to a predetermined output limit value or less and drives the drive control unit. I have.
  • the output limit value may be set to 50% or less of the maximum output of the heat medium heating device.
  • the vehicle air conditioner includes an outside temperature determination unit that determines whether or not the outside temperature is equal to or lower than a preset predetermined temperature threshold, and the refrigerant circuit comprises the radiator and the outdoor heat exchange.
  • the auxiliary heating unit includes a third refrigerant flow passage that branches from the second refrigerant flow passage formed between the vessel and the vessel, bypasses the outdoor heat exchanger, and is connected to the first refrigerant flow passage. The heat medium heated by the heat medium heating device is heated by the first heat medium circulation circuit and the heat medium heating device, which causes the heat medium to flow into the heat medium heating device again via the heat medium-refrigerator heat exchanger.
  • the heat medium is allowed to flow into the heat medium-refrigerator heat exchanger, and the heat medium that has flowed out of the heat medium-refrigerator heat exchanger is allowed to flow into the heat exchanger in the air flow passage.
  • the drive control unit includes a second heat medium circulation circuit that allows the heat medium flowing out of the internal heat exchanger to flow into the heat medium heating device again, and the drive control unit uses the outside temperature determination unit to change the outside temperature to the temperature.
  • the heat medium is circulated in the first heat medium circulation circuit, and the heat medium circulated in the first heat medium circulation circuit in the heat medium-refrigerator heat exchanger and the heat medium.
  • the heat medium may exchange heat with the refrigerant flowing into the refrigerant heat exchanger through the third refrigerant flow passage.
  • the drive control unit does not perform the air conditioning operation or uses the refrigerant circuit in the air conditioning operation execution determination unit, although the air conditioning operation using the refrigerant circuit is possible.
  • the output limitation by the output limit value of the heat medium heating device is released to heat the heat medium, and the heat medium is circulated by the second heat medium circulation circuit. , The air flowing through the air flow passage may be heated.
  • the present invention it is possible to improve the heating performance while suppressing the deterioration of the durability of the heat medium heating device as much as possible.
  • the vehicle air conditioner 1 of the present invention is applied to an electric vehicle capable of traveling by the driving force of an electric motor such as a hybrid vehicle, a plug-in hybrid vehicle, and an electric vehicle.
  • the "temperature control target device” is a “battery”, an “electric motor”, an “inverter”, and an “ECU (Electronic Control Unit)” which are mounted on an electric vehicle and used when traveling or driving the vehicle. ) ”, which can be an in-vehicle device (vehicle-mounted heat generating device) that can be a heat source that generates heat during driving, and the temperature is adjusted by cooling or heating so that the driving temperature becomes appropriate.
  • the "battery” will be cooled as the temperature control target device 100.
  • FIG. 1 is a diagram showing a configuration of a vehicle air conditioner 1 according to the present embodiment.
  • the vehicle air conditioner 1 is a device that performs air conditioning (heating, cooling, dehumidification, and ventilation) in the vehicle interior.
  • the vehicle air conditioner 1 includes an air conditioning unit 10 provided in the vehicle interior, a refrigerant circuit 20 provided in the vehicle interior and outside the vehicle interior, an auxiliary heating unit 30 for cooling the temperature control target device 100, and the like. It includes a control device 40 that comprehensively controls drive of each part constituting the vehicle air conditioner 1.
  • the air conditioning unit 10 has an air flow passage 11 for circulating air supplied to the vehicle interior.
  • One end side of the air flow passage 11 has an outside air intake port 12a for allowing air outside the vehicle interior to flow into the air flow passage 11, and an inside air intake port 12b for allowing air inside the vehicle interior to flow into the air flow passage 11.
  • a suction port 12 is provided.
  • a suction port switching damper 13 capable of opening one of the outside air suction port 12a or the inside air suction port 12b and closing the other is provided.
  • an indoor blower 14 such as a sirocco fan for flowing air from one end side to the other end side of the air flow passage 11 is provided.
  • an outlet is provided to blow out the air flowing through the air flow passage 11 to a predetermined location in the vehicle interior.
  • the air outlets are a foot air outlet (not shown) that blows out toward the feet of the passenger, a vent air outlet (not shown) that blows out toward the upper body of the passenger, and an air outlet that blows out toward the interior side surface of the windshield of the vehicle.
  • a differential outlet (not shown) is provided, and an outlet switching damper (not shown) for switching the blowing direction of air from each outlet is provided.
  • a heat absorber 15 for cooling and dehumidifying the air flowing through the air flow passage 11 is provided on the downstream side of the indoor blower 14 in the air flow passage 11 in the air flow direction. Further, a radiator 16 for heating the air flowing through the air flow passage 11 is provided on the downstream side of the heat absorber 15 in the air flow passage 11 in the air flow direction.
  • the radiator 16 is arranged on one side in the orthogonal direction of the air flow passage 11, and a bypass flow passage 11a that bypasses the radiator 16 is formed on the other side in the orthogonal direction of the air flow passage 11. Between the heat absorber 15 and the radiator 16 in the air flow passage 11, the air volume ratio between the air flowing into the radiator 16 and the air flowing through the bypass flow passage 11a among the air passing through the heat absorber 15 is adjusted. An air mix damper 17 is provided for this purpose.
  • the location where the radiator 16 is installed is not limited to the air flow passage 11, and may be outside the air conditioning unit 10.
  • the air mix damper 17 closes one of the bypass flow passage 11a and the radiator 16 on the upstream side in the air flow direction to open the other, or dissipates heat.
  • the opening degree on the upstream side in the air flow direction of the vessel 16 is adjusted to open both the bypass flow passage 11a and the radiator 16.
  • the temperature of the air conditioning air blown from the air conditioning unit 10 into the vehicle interior can be adjusted by adjusting the opening position of the air mix damper 17.
  • the refrigerant circuit 20 includes the above-mentioned heat absorber 15 and radiator 16, a compressor 21 for compressing the refrigerant, an outdoor heat exchanger 22 for heat exchange between the refrigerant and the air outside the vehicle interior, and fully closed and fully opened.
  • An electronic expansion valve 23 (first expansion valve 23a, second expansion valve 23b, and third expansion valve 23c) capable of adjusting the valve opening between the two and an electromagnetic valve for opening and closing the flow path of the refrigerant.
  • 24 first electromagnetic valve 24a, second electromagnetic valve 24b
  • a check valve 25 first check valve 25a, second check valve 25b
  • a heat medium-refrigerant heat exchanger 27 is provided.
  • Each part constituting the refrigerant circuit 20 is connected so that the refrigerant can be circulated by the refrigerant flow passages 20a to 20g including the refrigerant pipes such as aluminum pipes and copper pipes.
  • the refrigerant flowing through the refrigerant circuit 20 for example, R-134a or the like is used.
  • the outdoor heat exchanger 22 is arranged outside the vehicle interior such as an engine room so that the flow direction of the air that exchanges heat with the refrigerant is the front-rear direction of the vehicle.
  • an outdoor blower 22a is provided to circulate the air outside the vehicle interior in the front-rear direction when the vehicle is stopped.
  • a refrigerant flow passage 20a connecting the refrigerant discharge side of the compressor 21 and the refrigerant inflow side of the radiator 16 is formed, and the refrigerant outflow side of the radiator 16 and the refrigerant of the outdoor heat exchanger 22 are formed.
  • a refrigerant flow passage 20b (corresponding to the “second refrigerant flow passage” in the scope of the patent claim) connecting to the inflow side is formed.
  • a first expansion valve 23a is provided in the refrigerant flow passage 20b.
  • the refrigerant circuit 20 is formed with a refrigerant flow passage 20c (corresponding to the "first refrigerant flow passage” in the claims) connecting the refrigerant outflow side of the outdoor heat exchanger 22 and the refrigerant inflow side of the heat absorber 15. Has been done.
  • the refrigerant flow passage 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 circuit 20 is formed with a refrigerant flow passage 20d that connects the refrigerant outflow side of the heat absorber 15 and the refrigerant intake side of the compressor 21.
  • the refrigerant flow passage 20d is provided with a second check valve 25b and an accumulator 26 in this order from the endothermic device 15 side.
  • the outdoor heat exchanger 22 is bypassed between the radiator 16 and the first expansion valve 23a in the refrigerant flow passage 20b, and the first check valve 25a and the second expansion valve in the refrigerant flow passage 20c.
  • a refrigerant flow passage 20e connecting to and 23b is formed.
  • a first solenoid valve 24a is provided in the refrigerant flow passage 20e.
  • the refrigerant connecting between the outdoor heat exchanger 22 in the refrigerant flow passage 20c and the first check valve 25a is connected between the heat absorber 15 and the first check valve 25b in the refrigerant flow passage 20d.
  • a flow passage 20f (corresponding to the “fifth refrigerant flow passage” in the scope of the patent claim) is formed.
  • a second solenoid valve 24b is provided in the refrigerant flow passage 20f.
  • the first check valve 25a and the second expansion valve 23b are connected to the refrigerant inflow side of the heat medium-refrigerant heat exchanger 27, and the refrigerant outflow of the heat medium-refrigerant heat exchanger 27.
  • a refrigerant flow passage 20g is formed from the side connecting between the second check valve 25b and the accumulator 26 in the refrigerant flow passage 20d.
  • a third expansion valve 23c is provided on the refrigerant inflow side of the heat medium-refrigerant heat exchanger 27 in the refrigerant flow passage 20g.
  • the refrigerant flow passage 20g is a flow path for flowing the refrigerant separated from the refrigerant flow passage 20c to the refrigerant flow passage 20d after passing through the heat medium-refrigerant heat exchanger 27.
  • the refrigerant flows into the refrigerant flow passage 20g, the refrigerant is depressurized by the third expansion valve 23c and flows into the heat medium-refrigerant heat exchanger 27.
  • the refrigerant flowing into the heat medium-refrigerant heat exchanger 27 evaporates in the heat medium-refrigerant heat exchanger 27 and exchanges heat with the heat medium flowing in the auxiliary heating unit 30.
  • the auxiliary heating unit 30 circulates a heat medium (for example, water, a refrigerant such as HFO-1234yf, a liquid such as coolant, or air) through the battery of the temperature control target device 100 to adjust the temperature of the temperature control target device 100.
  • a heat medium for example, water, a refrigerant such as HFO-1234yf, a liquid such as coolant, or air
  • the auxiliary heating unit 30 switches the flow direction of the circulation pump 31 as a circulation device for circulating the heat medium, the heat medium heating device (ECH) 32 for heating the heat medium, and the heat medium circulating in the auxiliary heating unit 30.
  • a direction switching valve 33 such as a three-way valve and a heat exchanger in an air flow passage provided between a heat absorber 15 and a radiator 16 in the air flow direction in the air conditioning unit 10 to exchange heat between a heat medium and air (a heat exchanger in an air flow passage).
  • a heater core) 34 is provided.
  • the circulation pump 31 the heat medium heating device 32, the heat medium-refrigerant heat exchanger 27, the temperature control target device 100, and the heat exchanger 34 in the air flow passage are connected in a ring shape by a heat medium pipe, and the direction is
  • the switching valve 33 forms a heat medium circulation circuit 30a in which the flow path of the heat medium can be switched.
  • the heat medium circulation circuit 30a is connected to the discharge side of the circulation pump 31 and the heat medium inflow side of the heat medium heating device 32 by a heat medium piping, and is connected to the heat medium outflow side of the heat medium heating device 32.
  • the heat medium-the heat medium inflow side of the refrigerant heat exchanger 27 are connected, and the heat medium-the heat medium outflow side of the refrigerant heat exchanger 27 and the heat medium inflow side of the temperature control target device 100 are connected via the direction switching valve 33.
  • the heat medium when the heat medium starts from the circulation pump 31, the heat medium is the “heat medium heating device 32” ⁇ “heat medium-refrigerant heat exchanger 27” ⁇ “direction switching valve” in order from the circulation pump 31. It circulates from “33” to "equipment subject to temperature control 100" and returns to the circulation pump 31 again.
  • the heat medium circulation circuit 30a is connected to the heat medium outflow side of the heat medium-refrigerant heat exchanger 27 and the heat medium of the air flow passage heat exchanger 34 via the direction switching valve 33 by the heat medium piping.
  • a "second heat medium circulation circuit 30c" is formed in which the inflow side is connected and the heat medium outflow side of the heat exchanger 34 in the air flow passage and the heat medium suction side of the circulation pump 31 are connected.
  • the heat medium when the heat medium starts from the circulation pump 31, the heat medium is the “heat medium heating device 32” ⁇ “heat medium-refrigerant heat exchanger 27” ⁇ “direction switching valve” in order from the circulation pump 31. It circulates from “33” to "heat exchanger in the air flow passage 34" to "circulation pump 31", and returns to the circulation pump 31 again.
  • the control device 40 includes an ECU (Electronic Control Unit) composed of a well-known microcomputer including a CPU, ROM, RAM, and peripheral circuits thereof.
  • the control device 40 performs various calculations and processes based on the control program stored in the ROM, and controls the operation of various control targets connected to the output side.
  • the control device 40 includes an outside air temperature sensor 41 for detecting the temperature outside the vehicle interior, an inside air temperature sensor 42 for detecting the temperature inside the vehicle interior, and the temperature of the heat absorber 15 (heat absorption).
  • the temperature of the heat absorber temperature sensor 43 for detecting the temperature of the air that has passed through the device 15, the temperature of the heat absorber 15 itself, or the temperature of the refrigerant immediately after leaving the heat absorber 15, and the temperature of the radiator 16 (radiator 16).
  • the radiator temperature sensor 44 for detecting the temperature of the air passing through the radiator, the temperature of the radiator 16 itself, or the temperature of the refrigerant immediately after leaving the radiator 16, and the inside air humidity for detecting the humidity in the vehicle interior.
  • the suction pressure sensor 51 for detecting the suction refrigerant pressure of 21 and the temperature of the outdoor heat exchanger 22 are detected.
  • the outdoor heat for detecting the refrigerant pressure of the outdoor heat exchanger 22 and the outdoor heat exchanger 22 (the pressure of the refrigerant inside the outdoor heat exchanger 22 or immediately after exiting from the outdoor heat exchanger 22).
  • the temperature of the exchanger pressure sensor 53 and the heat exchanger 34 in the air flow passage (the temperature of the heat exchanger 34 in the air flow passage, the temperature of the heat medium exiting the heat exchanger 34 in the air flow passage, or the air flow passage).
  • the speed sensor 56 for detection and the temperature of the temperature control target device 100 (the temperature of the temperature control target device 100 itself, the temperature of the heat medium exiting the temperature control target device 100, or the heat medium entering the temperature control target device 100).
  • the device temperature sensor 57 for detecting the temperature) and the setting operation unit 58 for setting the set temperature in the vehicle interior by the passenger and switching the operation content of the air conditioner are connected.
  • Each of the above-mentioned sensors is installed at a position in the vehicle interior (or outside the vehicle interior) where the information to be detected can be detected.
  • the control device 40 includes an indoor blower 14, an air mix damper 17, a compressor 21, an outdoor blower 22a, and an expansion valve 23 (first expansion valve 23a to third expansion valve). 23c), the solenoid valve 24 (first solenoid valve 24a, second solenoid valve 24b), the heat medium heating device 32, and the direction switching valve 33 are connected.
  • the control device 40 performs drive control of each connected unit based on the information detected by each sensor and the operation signal from the setting operation unit 58. Further, when the operation mode setting instruction is input from the setting operation unit 58, the control device 40 drives the air conditioning unit 10 and the refrigerant circuit 20 to manage the air conditioning in the vehicle interior as the operation mode, and the air conditioning mode. Drive control of each part is performed so that the "auxiliary heating mode" in which the auxiliary heating function is added to the heating mode set as the mode is executed.
  • the control device 40 determines that the air conditioning operation using the refrigerant circuit 20 is possible when executing the auxiliary heating mode, the control device 40 of the heat medium heating device 32 so as to be equal to or less than a preset output limit value.
  • the output limit value is set to a maximum output of 50% or less, although it depends on the equipment performance of the heat medium heating device 32, in order to prevent deterioration of durability caused by driving the heat medium heating device 32 at the maximum output. You can.
  • control device 40 executes the auxiliary heating mode, only when it is determined that the air conditioning operation using the refrigerant circuit 20 is possible but the air conditioning operation is not performed or the air conditioning operation using the refrigerant circuit 20 is not possible.
  • the output of the heat medium heating device 32 according to the output limit value is released so that the maximum output can be driven.
  • the determination of whether or not the air conditioning operation using the refrigerant circuit 20 by the control device 40 is possible is comprehensively determined in consideration of the outside air temperature, the temperature of the refrigerant sucked into the compressor 21, the discharge pressure of the compressor 21, and the like. ..
  • the control device 40 is used to prevent the compressor 21 from failing not only when the compressor 21 itself fails and does not drive, but also when, for example, the refrigerant temperature is too low and the capacity of the compressor 21 is extremely lowered. It is determined that "the air conditioning operation using the refrigerant circuit 20 is not performed (or cannot be performed)".
  • the air-conditioning mode is a mode for controlling air-conditioning such as temperature / humidity adjustment in the vehicle interior, and is a “cooling mode” in which a cooling operation is performed to lower the temperature in the vehicle interior and a “cooling mode” in which the humidity in the vehicle interior is reduced and the temperature is lowered.
  • “Dehumidifying / cooling mode” that performs dehumidifying / cooling operation
  • “heating mode” that performs heating operation that raises the temperature inside the vehicle
  • dehumidifying / heating that performs dehumidifying / heating operation that lowers the humidity inside the vehicle and raises the temperature
  • the air conditioning unit 10 drives the indoor blower 14 and sets the opening degree of the air mix damper 17 so that air does not flow into the radiator 16 side. Further, in the refrigerant circuit 20, the compressor 21 is operated with the first expansion valve 23a fully open, the second expansion valve 23b having a predetermined valve opening degree, and the first solenoid valve 24a and the second solenoid valve 24b closed. Drive.
  • the refrigerant flowing through the refrigerant circuit 20 is discharged from the compressor 21, passes through the radiator 16 and the first expansion valve 23a, and flows into the outdoor heat exchanger 22.
  • the refrigerant flowing into the outdoor heat exchanger 22 is air-cooled by the outside air ventilated by the outdoor blower 22a and condensed.
  • the refrigerant flowing out of the outdoor heat exchanger 22 passes through the first check valve 25a and reaches the second expansion valve 23b, it is depressurized and then flows into the heat absorber 15 and evaporates. After that, the refrigerant flowing out of the heat absorber 15 passes through the second check valve 25b, flows into the accumulator 26, is gas-liquid separated, and is then sucked into the compressor 21. The refrigerant circulates in the refrigerant circuit 20 following the above path.
  • the air flowing through the air flow passage 11 is cooled to the target blowing temperature by exchanging heat with the refrigerant that absorbs heat in the heat absorber 15, and is blown into the vehicle interior.
  • the opening degree of the air conditioning unit 10 is set so as to ventilate both the bypass flow passage 11a and the air mix damper 17. Further, in the refrigerant circuit 20, the compressor 21 is operated with the first expansion valve 23a fully open, the second expansion valve 23b having a predetermined valve opening degree, and the first solenoid valve 24a and the second solenoid valve 24b closed. Drive.
  • the refrigerant flowing through the refrigerant circuit 20 is discharged from the compressor 21 and then flows into the radiator 16 and exchanges heat with the air in the air flow passage 11 to take heat away, cool it, and condense it. ..
  • the refrigerant flowing out of the radiator 16 reaches the first expansion valve 23a, it is depressurized and then flows into the outdoor heat exchanger 22.
  • the refrigerant flowing into the outdoor heat exchanger 22 is cooled by the outside air ventilated by the outdoor blower 22a and condensed.
  • the refrigerant flowing out of the outdoor heat exchanger 22 passes through the first check valve 25a and reaches the second expansion valve 23b, it is depressurized and then flows into the heat absorber 15 and evaporates. After that, the refrigerant flowing out of the heat absorber 15 passes through the second check valve 25b, flows into the accumulator 26, is gas-liquid separated, and is then sucked into the compressor 21. The refrigerant circulates in the refrigerant circuit 20 following the above path.
  • the air flowing through the air flow passage 11 is cooled and dehumidified by exchanging heat with the refrigerant that absorbs heat in the heat absorber 15, and is reheated by exchanging heat with the refrigerant that dissipates heat in the radiator 16 to reach the target blowout temperature. It is adjusted to and blown into the passenger compartment.
  • the air conditioning unit 10 drives the indoor blower 14 and sets the opening degree of the air mix damper 17 so that air is ventilated to the radiator 16. Further, in the refrigerant circuit 20, the first expansion valve 23a is set to a predetermined valve opening smaller than the fully open valve, the second expansion valve 23b and the first solenoid valve 24a are closed, and the second solenoid valve 24b is fully opened. The compressor 21 is driven in this state.
  • the refrigerant flowing through the refrigerant circuit 20 is discharged from the compressor 21 and then flows into the radiator 16 and exchanges heat with the air in the air flow passage 11 to take heat away, cool it, and condense it. ..
  • the refrigerant flowing out of the radiator 16 reaches the first expansion valve 23a, it is depressurized and then flows into the outdoor heat exchanger 22.
  • the refrigerant that has flowed into the outdoor heat exchanger 22 evaporates and absorbs heat from the outside air that is ventilated by the outdoor blower 22a.
  • the refrigerant flowing out of the outdoor heat exchanger 22 passes through the second solenoid valve 24b and the second check valve 25b, flows into the accumulator 26, is separated into gas and liquid, and is then sucked into the compressor 21.
  • the refrigerant circulates in the refrigerant circuit 20 following the above path.
  • the air flowing through the air flow passage 11 is heated by exchanging heat with the refrigerant dissipated in the radiator 16, adjusted to the target blowing temperature, and blown into the vehicle interior.
  • the dehumidifying / heating mode includes a first dehumidifying / heating mode and a second dehumidifying / heating mode.
  • the opening degree of the air conditioning unit 10 is set so as to drive the indoor blower 14 and to ventilate both the bypass flow passage 11a and the air mix damper 17. Further, in the refrigerant circuit 20, the first expansion valve 23a and the second expansion valve 23b are each set to a predetermined valve opening smaller than the fully open valve, and the first solenoid valve 24a and the second solenoid valve 24b are compressed in a closed state. Drive the machine 21.
  • the refrigerant flowing through the refrigerant circuit 20 is discharged from the compressor 21 and then flows into the radiator 16 and exchanges heat with the air in the air flow passage 11 to take heat away, cool it, and condense it. ..
  • the refrigerant flowing out of the radiator 16 reaches the first expansion valve 23a, it is depressurized and then flows into the outdoor heat exchanger 22.
  • the refrigerant that has flowed into the outdoor heat exchanger 22 evaporates and absorbs heat from the outside air that is ventilated by the outdoor blower 22a.
  • the refrigerant flowing out of the outdoor heat exchanger 22 passes through the first check valve 25a and reaches the second expansion valve 23b, it is depressurized and then flows into the heat absorber 15 and evaporates. After that, the refrigerant flowing out of the heat absorber 15 passes through the second check valve 25b, flows into the accumulator 26, is gas-liquid separated, and is then sucked into the compressor 21. The refrigerant circulates in the refrigerant circuit 20 following the above path.
  • the air flowing through the air flow passage 11 is dehumidified and cooled by exchanging heat with the refrigerant that absorbs heat in the heat absorber 15, and is heated by exchanging heat with the refrigerant that dissipates heat in the radiator 16 to blow out the target. It is adjusted to the temperature and blown into the passenger compartment.
  • the opening degree is set so that the indoor blower 14 is driven in the air conditioning unit 10 and the air is ventilated to both the bypass flow passage 11a and the air mix damper 17. Further, in the refrigerant circuit 20, 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 for compression. Drive the machine 21.
  • the refrigerant flowing through the refrigerant circuit 20 is discharged from the compressor 21 and then flows into the radiator 16 and exchanges heat with the air in the air flow passage 11 to take heat away, cool it, and condense it. ..
  • the refrigerant flowing out of the radiator 16 passes through the first solenoid valve 24a and reaches the second expansion valve 23b, it is depressurized and then flows into the heat absorber 15 and evaporates.
  • the refrigerant flowing out of the heat absorber 15 passes through the second check valve 25b, flows into the accumulator 26, is gas-liquid separated, and is then sucked into the compressor 21.
  • the refrigerant circulates in the refrigerant circuit 20 following the above path.
  • the air flowing through the air flow passage 11 is cooled by exchanging heat with the refrigerant that absorbs heat in the heat absorber 15, is heated by exchanging heat with the refrigerant that dissipates heat in the radiator 16, and is adjusted to the target blowing temperature. It is blown into the passenger compartment.
  • auxiliary heating mode executed by the vehicle air conditioner 1 according to the present embodiment will be described with reference to FIGS. 3 to 6.
  • the arrows shown in each figure indicate the flow of the refrigerant or heat medium when the corresponding mode is executed.
  • the "auxiliary heating mode” is a mode that is switched when the control device 40 determines that the auxiliary heating function is necessary when the "heating mode” is set as the air conditioning mode. That is, when the user sets the heating mode, the control device 40 determines that the "heating mode” is set as the heating operation when the auxiliary heating function is not required, and the "auxiliary heating” is set when the auxiliary heating function is required. Mode "is executed.
  • auxiliary heating mode air conditioning operation using the refrigerant circuit 20 is possible, and the "normal auxiliary heating mode” and “at low temperature” are set to combine the operation in the heating mode with the auxiliary heating function as the air conditioning operation.
  • auxiliary heating mode and, for example, when the outside temperature is extremely low below -15 ° C or when the compressor 21 itself fails, air conditioning operation using the refrigerant circuit is possible, but air conditioning operation is not performed.
  • the "emergency auxiliary heating mode” that is set when it is determined that the air conditioning operation using the refrigerant circuit 20 cannot be performed is included.
  • the "normal auxiliary heating mode” and the “low temperature auxiliary heating mode” are selected and set based on the determination result that the control device 40 compares the outside air temperature with the preset mode selection temperature threshold value.
  • the mode selection temperature threshold is set to, for example, "-10 ° C” at which the capacity of the compressor 21 begins to decline, and the control device 40 sets the "normal auxiliary heating mode” when the outside air temperature is higher than -10 ° C.
  • the “low temperature auxiliary heating mode” may be set.
  • the auxiliary heating mode will be described as a mode that is set on the premise that the heating mode is set, but the auxiliary heating mode is set independently in the dehumidifying heating mode or without setting the heating mode. It is also possible to do.
  • the normal auxiliary heating mode is set when the outside temperature is a temperature that requires an auxiliary heating function such as "0 ° C. to -9 ° C.”, and the air circulating in the air flow passage 11 is blown by the above-mentioned heating mode. In this mode, the air is heated and the air flowing in the air flow passage 11 is auxiliary heated by using the heat medium heated by the heat medium heating device 32.
  • the normal auxiliary heating mode includes a "first normal auxiliary heating mode" and a "second normal auxiliary heating mode”. Normally, in the auxiliary heating mode, the heat medium circulates in the second heat medium circulation circuit 30c so as to be distributed to the heat exchanger 34 in the air flow passage serving as the heater core. In the first normal auxiliary heating mode and the second normal auxiliary heating mode, the output of the heat medium heating device 32 is limited so as to be equal to or less than a preset output limit value.
  • FIG. 3 shows the flow of the refrigerant and the heat medium in the first normal auxiliary heating mode. Since the flow of the refrigerant in the heating mode executed in the first normal auxiliary heating mode is the same as the flow of the refrigerant in the refrigerant circuit 20 in the heating mode described above, the description thereof will be omitted.
  • the heat medium in the auxiliary heating unit 30 in the first normal auxiliary heating mode flows into the heat medium heating device 32 when discharged from the circulation pump 31.
  • the heat medium that has flowed into the heat medium heating device 32 is heated to a predetermined temperature, then passes through the heat medium-refrigerant heat exchanger 27 and flows into the heat exchanger 34 in the air flow passage.
  • the heat medium flowing into the heat exchanger 34 in the air flow passage exchanges heat with the air flowing in the air flow passage 11. Then, the heat medium flowing out from the heat exchanger 34 in the air flow passage is sucked into the circulation pump 31.
  • the air flowing in the air flow passage 11 is auxiliary heated by the heat exchanger 34 in the air flow passage, and this air is further heated in the radiator 16.
  • FIG. 4 shows the flow of the refrigerant and the heat medium in the second normal auxiliary heating mode.
  • the refrigerant in the refrigerant circuit 20 in the heating mode in the second normal auxiliary heating mode is discharged from the compressor 21 and then flows into the radiator 16 to be combined with the air in the air flow passage 11. By exchanging heat, heat is taken away, it is cooled, and it condenses.
  • the refrigerant flowing out of the radiator 16 reaches the first expansion valve 23a, it is depressurized and then flows into the outdoor heat exchanger 22.
  • the refrigerant that has flowed into the outdoor heat exchanger 22 evaporates and absorbs the outside air that is ventilated by the outdoor blower 22a.
  • the refrigerant flowing out of the outdoor heat exchanger 22 passes through the second solenoid valve 24b and the second check valve 25b, flows into the accumulator 26, is separated into gas and liquid, and is then sucked into the compressor 21.
  • the refrigerant circulates in the refrigerant circuit 20 following the above path.
  • a part of the refrigerant flowing out from the radiator 16 passes through the first solenoid valve 24a, bypasses the refrigerant flow passage 20e, and reaches the third expansion valve 23c through the refrigerant flow passage 20c.
  • the refrigerant that has reached the third expansion valve 23c flows into the heat medium-refrigerant heat exchanger 27 and evaporates after being depressurized, and absorbs the heat of the heat medium. After that, the refrigerant flowing out of the heat medium-refrigerant heat exchanger 27 flows into the accumulator 26, is gas-liquid separated, and then is sucked into the compressor 21.
  • the heat medium in the auxiliary heating unit 30 in the second normal auxiliary heating mode When the heat medium in the auxiliary heating unit 30 in the second normal auxiliary heating mode is discharged from the circulation pump 31, it flows into the heat medium heating device 32.
  • the heat medium that has flowed into the heat medium heating device 32 flows into the heat medium-refrigerant heat exchanger 27 after being heated to a predetermined temperature.
  • the heat medium flowing into the heat medium-refrigerant heat exchanger 27 is heat-exchanged with the refrigerant flowing into the heat medium-refrigerant heat exchanger 27, and then flows into the heat exchanger 34 in the air flow passage.
  • the heat medium flowing into the heat exchanger 34 in the air flow passage exchanges heat with the air flowing in the air flow passage 11. Then, the heat medium flowing out from the heat exchanger 34 in the air flow passage is sucked into the circulation pump 31.
  • the air flowing through the air flow passage 11 is auxiliary heated by the heat exchanger 34 in the air flow passage, and this air flows into the radiator 16. Is further heated.
  • the heat medium and the compressor heated by the heat medium heating device 32 in the heat medium-refrigerant heat exchanger 27.
  • the temperature of the refrigerant is raised by exchanging heat with the refrigerant before being sucked into the 21.
  • the low temperature auxiliary heating mode is set when the outside temperature is lower than the temperature at which the normal auxiliary heating mode is set, such as "-10 ° C to -15 ° C", and the air flow passage is set by the above-mentioned heating mode.
  • the heat medium-refrigerant heat exchanger 27 exchanges heat between the heat medium heated by the heat medium heating device 32 and the refrigerant before being sucked into the compressor 21 to obtain the refrigerant. This mode raises the temperature.
  • the heat medium is not circulated to the heat exchanger 34 in the air flow passage serving as the heater core, but circulates in the first heat medium circulation circuit 30b.
  • the output of the heat medium heating device 32 is limited so as to be equal to or less than a preset output limit value, as in the normal auxiliary heating mode.
  • FIG. 5 shows the flow of the refrigerant and the heat medium in the auxiliary heating mode at low temperature. Since the refrigerant in the refrigerant circuit 20 in the heating mode in the low temperature auxiliary heating mode is the same as the flow of the refrigerant in the second normal auxiliary heating mode, the description thereof will be omitted.
  • the heat medium in the auxiliary heating unit 30 in the low temperature auxiliary heating mode flows into the heat medium heating device 32 when discharged from the circulation pump 31.
  • the heat medium that has flowed into the heat medium heating device 32 flows into the heat medium-refrigerant heat exchanger 27 after being heated to a predetermined temperature.
  • the heat medium that has flowed into the heat medium-refrigerant heat exchanger 27 is heat-exchanged with the refrigerant that flows into the heat medium-refrigerant heat exchanger 27, and then flows into the temperature control target device 100.
  • the heat medium that has flowed into the temperature control target device 100 is sucked into the circulation pump 31 after adjusting the temperature of the temperature control target device 100.
  • the outside temperature is as low as -10 ° C to -15 ° C, and the heat exchange between the refrigerant and the outside air by the outdoor heat exchanger 22 may be insufficient, but the heat heated by the heat medium heating device 32.
  • the heat medium-refrigerant heat exchanger 27 By exchanging heat between the medium and the refrigerant with the heat medium-refrigerant heat exchanger 27 to raise the temperature of the refrigerant, it is possible to exchange heat with the refrigerant while adjusting the temperature of the device 100 subject to temperature control.
  • the suction pressure of the compressor 21 is higher than in the normal heating mode by not circulating the heat medium to the heat exchanger 34 in the air flow passage, and as a result, the output of the compressor 21 is output. Since it can be raised, the output of the heat medium heating device 32 can be suppressed.
  • the temperature of the heat medium is adjusted so that the drive temperature falls within the range of, for example, 10 ° C. to 40 ° C. in order to prevent the life / performance deterioration of the battery of the device 100 subject to temperature control.
  • the emergency auxiliary heating mode is used, for example, when the outside temperature becomes extremely low, less than -15 ° C, and the temperature of the refrigerant is too low, which may cause the compressor 21 to fail, or when the compressor 21 itself fails.
  • This is an emergency mode set when the control device 40 determines that the air conditioning operation using the refrigerant circuit 20 is possible but the air conditioning operation is not performed or the air conditioning operation using the refrigerant circuit 20 is not possible.
  • the air flowing in the air flow passage 11 is heated by using only the heat medium heated by the heat medium heating device 32 without operating in the heating mode. It circulates in the second heat medium circulation circuit 30c so as to be distributed to the in-pass heat exchanger 34.
  • FIG. 6 shows the flow of the heat medium in the emergency auxiliary heating mode.
  • the heat medium in the auxiliary heating unit 30 in the emergency auxiliary heating mode flows into the heat medium heating device 32 when discharged from the circulation pump 31.
  • the heat medium that has flowed into the heat medium heating device 32 is heated to a predetermined temperature, then passes through the heat medium-refrigerant heat exchanger 27 and flows into the heat exchanger 34 in the air flow passage.
  • the heat medium flowing into the heat exchanger 34 in the air flow passage exchanges heat with the air flowing in the air flow passage 11. Then, the heat medium flowing out from the heat exchanger 34 in the air flow passage is sucked into the circulation pump 31.
  • the heating operation in the heating mode cannot be performed. Therefore, the heat exchanger 34 in the air flow passage exchanges heat between the heat medium and the air in the air flow passage 11, and the air heated by the heat exchange is heated. Used as. Therefore, only in the emergency auxiliary heating mode, the output limitation of the heat medium heating device 32 is released so that the maximum output can be driven.
  • auxiliary heating modes three types of modes, which are roughly classified as auxiliary heating modes, are set.
  • the control device 40 determines whether or not the air-conditioning operation using the refrigerant circuit 20 is possible, and when it is determined that the air-conditioning operation using the refrigerant circuit 20 is possible, the "normal auxiliary heating mode" or "at low temperature” is determined according to the outside temperature. If the "auxiliary heating mode” is set and it is determined that the air conditioning operation using the refrigerant circuit 20 is possible but the air conditioning operation is not performed or the air conditioning operation using the refrigerant circuit 20 is not possible, the output of the heat medium heating device 32 is limited. Set the "emergency auxiliary heating mode" to release and drive.
  • the heating mode when the heating mode is set, it is determined whether or not the air conditioning operation using the refrigerant circuit 20 is possible based on the state of the compressor 21 and the outside temperature, and an appropriate auxiliary heating mode is used. Can be set, so that the environment inside the vehicle interior can be kept good while suppressing deterioration of the durability of the heat medium heating device 32 as much as possible.
  • control device 40 when the control device 40 executes the heating mode as the air conditioning mode (ST1), it functions as an auxiliary heating execution determination unit and determines whether or not it is necessary to switch to the auxiliary heating mode as the operation mode. (ST2).
  • control device 40 determines that it is necessary to switch to the auxiliary heating mode as the operation mode (ST2-Yes)
  • the control device 40 then functions as an air conditioning operation execution determination unit, and the air conditioning operation using the refrigerant circuit 20 is performed. It is determined whether or not it is possible (that is, whether or not the air conditioning operation is executed) (ST3).
  • the control device 40 determines that it is not necessary to switch to the auxiliary heating mode as the operation mode (ST2-No)
  • the control device 40 functions as a drive control unit so that the operation in the set heating mode is continued. Each unit is driven and controlled (ST4), and the process ends.
  • control device 40 determines that the air-conditioning operation using the refrigerant circuit 20 is possible (ST3-Yes), it then functions as an outside air temperature determination unit to select a mode in which the outside air temperature is preset. It is determined whether or not it is below the temperature threshold (ST5). On the other hand, in ST3, when it is determined that the air conditioning operation using the refrigerant circuit 20 is not possible or not (ST3-No), the control device 40 functions as a drive control unit so that the processing in the emergency auxiliary heating mode is executed. Each part is driven and controlled (ST6), and the process is completed.
  • the control device 40 In ST5, when it is determined that the outside air temperature is equal to or lower than the mode selection temperature threshold value (ST5-Yes), the control device 40 functions as a drive control unit so that the process in the low temperature auxiliary heating mode is executed. Is driven and controlled (ST7), and the process is terminated. On the other hand, in ST5, when the control device 40 determines that the outside air temperature exceeds the mode selection temperature threshold value (ST5-No), each unit functions as a drive control unit so that processing in the normal auxiliary heating mode is executed. Is driven and controlled (ST8), and the process is terminated.
  • the vehicle air conditioner 1 includes an air flow passage 11 through which air supplied to the vehicle interior flows, a compressor 21 that compresses the refrigerant, and a radiator 16 that dissipates the refrigerant.
  • a refrigerant circuit 20 including a heat absorber 15 for absorbing the refrigerant, an outdoor heat exchanger 22 provided outside the vehicle interior for radiating or absorbing the refrigerant, a heat medium heating device 32 for heating the heat medium, and an air flow passage.
  • An auxiliary heating unit 30 that includes a heat exchanger 34 in the air flow passage that dissipates heat from the heat medium provided in 11 and that circulates the heat medium heated by the heat medium heating device 32 is connected in parallel with the heat absorber 15 and is outdoors.
  • the refrigerant branched and circulated from the first refrigerant flow passage (refrigerant flow passage 20c) formed between the heat exchanger 22 and the heat absorber 15 is depressurized by the third expansion valve 23c, and is depressurized by the third expansion valve 23c.
  • a control device 40 that drives the heat medium heating device 32 based on an output limit value set to 50% or less of the maximum output of the heat medium heating device 32.
  • an appropriate auxiliary heating mode can be selected based on the driving state of the compressor 21 and the outside air temperature, and the environment inside the vehicle interior can be kept good. Further, since the output of the heat medium heating device 32 is driven to be equal to or lower than the output limit value set to the extent that the durability does not deteriorate, the environment inside the vehicle interior can be kept while suppressing the deterioration of the durability of the heat medium heating device 32 as much as possible. Can be kept good.
  • the refrigerant circuit 20 branches from the second refrigerant flow passage (fuel flow passage 20b) formed between the radiator 16 and the outdoor heat exchanger 22.
  • a third refrigerant flow passage (fuel flow passage 20e) connected to the first refrigerant flow passage by bypassing the outdoor heat exchanger 22 is provided, and the auxiliary heating unit 30 is a heat medium heated by the heat medium heating device 32.
  • the first heat medium circulation circuit 30b and the heat medium heated by the heat medium heating device 32 are exchanged with each other through the heat medium-refrigerator heat exchanger 27.
  • the control device 40 includes a second heat medium circulation circuit 30c that flows into the medium heating device 32, and the control device 40 in the heat medium-refrigerator heat exchanger 27 when the outside temperature is equal to or lower than a preset mode selection temperature threshold.
  • the heat medium circulated in the first heat medium circulation circuit 30b and the refrigerant flowing into the heat medium-refrigerator heat exchanger 27 through the third refrigerant flow passage are exchanged for heat.
  • the heat medium circulates in the first heat medium circulation circuit 30b without flowing through the heat exchanger 34 in the air flow passage, and the refrigerant circulating in the refrigerant circuit 20 is the first heat in the heat medium-refrigerant heat exchanger 27. Since heat is exchanged with the heat medium circulating in the medium circulation circuit 30b, it is possible to operate in the heating mode with the output of the compressor 21 increased. Therefore, for example, even if the outside air temperature becomes as low as ⁇ 10 ° C. or lower, the environment inside the vehicle interior can be kept good.
  • the control device 40 can perform the air conditioning operation using the refrigerant circuit 20, but does not perform the air conditioning operation or cannot perform the air conditioning operation using the refrigerant circuit 20.
  • the output limit by the output limit value of the heat medium heating device 32 is released to heat the heat medium, and only the heat medium is circulated by the second heat medium circulation circuit 30c to allow the air flowing through the air flow passage 11 to flow. Let it heat.
  • the refrigerant circuit 20 it is possible to perform air conditioning operation using the refrigerant circuit 20 when the outside temperature is extremely low such as below -15 ° C, or when the compressor 21 itself fails, but the air conditioning operation is not performed or the refrigerant circuit 20 is used.
  • the environment inside the vehicle interior can be improved while suppressing the deterioration of the durability of the heat medium heating device 32 as much as possible. Can be kept good.
  • Air conditioner for vehicles 10 Air conditioning unit 11 Air flow passage (11a Bypass flow passage) 12 Inhalation port (12a outside air intake port, 12b inside air intake port) 13 Intake port switching damper 14 Indoor blower 15 Heat absorber 16 Heat radiator 17 Air mix damper 20 Refrigerant circuit (20a to 20g Refrigerant flow path) 21 Compressor 22 Outdoor heat exchanger 23 Expansion valve (23a 1st expansion valve, 23b 2nd expansion valve, 23c 3rd expansion valve) 24 Solenoid valve (24a first solenoid valve, 24b second solenoid valve) 25 Check valve (25a first check valve, 25b second check valve) 26 Accumulator 27 Heat medium-Refrigerant heat exchanger 28 Control valve 30 Auxiliary heating section (30a heat medium circulation circuit, 30b first heat medium circulation circuit, 30c second heat medium circulation circuit) 31 Circulation pump 32 Heat medium heating device 33 Direction switching valve 34 Heat exchanger in air flow passage 40 Control device

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

Abstract

La présente invention améliore les performances de chauffage tout en supprimant autant que possible une dégradation de la durabilité d'un dispositif de chauffage de véhicule thermique. Un climatiseur de véhicule comporte : un canal d'écoulement d'air (11) ; un circuit de refroidissement (20) comprenant un compresseur (21), un radiateur (16), un dissipateur thermique (15) et un échangeur de chaleur extérieure (22) ; une section de chauffage auxiliaire (30) dans laquelle un véhicule thermique chauffé par un dispositif de chauffage de véhicule thermique (32) est mis en circulation ; un échangeur de chaleur véhicule thermique-liquide de refroidissement (27) qui est relié en parallèle avec le dissipateur thermique (15) et qui effectue un échange de chaleur avec le véhicule thermique en amenant un liquide de refroidissement qui a été ramifié et s'est écoulé à partir d'un canal d'écoulement de liquide de refroidissement (20c) pour absorber la chaleur ; et un dispositif de commande (40) apte à des opérations de climatisation à l'aide du circuit de refroidissement (20), le dispositif de commande (40) entraînant le dispositif de chauffage de véhicule thermique (32) à une sortie limitée qui n'est pas supérieure à une valeur limite de sortie prédéterminée lorsqu'il est déterminé qu'il est nécessaire d'ajouter une fonction de chauffage auxiliaire.
PCT/JP2020/027792 2019-07-29 2020-07-17 Climatiseur de véhicule WO2021020161A1 (fr)

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CN114126901A (zh) 2022-03-01
DE112020003640T5 (de) 2022-05-05

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