CN119365354A - Car air conditioning unit - Google Patents
Car air conditioning unit Download PDFInfo
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- CN119365354A CN119365354A CN202380045910.9A CN202380045910A CN119365354A CN 119365354 A CN119365354 A CN 119365354A CN 202380045910 A CN202380045910 A CN 202380045910A CN 119365354 A CN119365354 A CN 119365354A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 53
- 239000003507 refrigerant Substances 0.000 claims abstract description 68
- 238000010521 absorption reaction Methods 0.000 claims abstract description 8
- 230000005855 radiation Effects 0.000 claims abstract description 8
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000005338 heat storage Methods 0.000 description 33
- 238000010438 heat treatment Methods 0.000 description 21
- 238000007791 dehumidification Methods 0.000 description 14
- 230000001276 controlling effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 101000686227 Homo sapiens Ras-related protein R-Ras2 Proteins 0.000 description 1
- 102100025003 Ras-related protein R-Ras2 Human genes 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
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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
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The stable state of the refrigerant circuit can be maintained in the operating state of the air conditioner in which the balance of the refrigerant circuit is maintained. Provided is an air conditioning device (1) for a vehicle, comprising a refrigerant circuit (R), a heat medium circuit (10) having a high-temperature heat medium channel (20) in which a high-temperature heat medium heated by heat radiation of the refrigerant circuit flows and a low-temperature heat medium cooled by heat absorption of the refrigerant circuit flows, and a heat exchanger (30) for an air conditioning unit (80) that arranges an air heat exchanger provided in the heat medium circuit in an air channel to be supplied into a vehicle interior, wherein the heat medium circuit comprises at least an external heat exchanger (45) that exchanges heat between the heat medium and the external air, and comprises a channel switching unit (V2) that separates the external heat exchanger from the high-temperature heat medium channel and the high-temperature heat medium channel.
Description
Technical Field
The present invention relates to an air conditioner for a vehicle.
Background
Conventionally, a vehicle air conditioner for an electric vehicle (including EV (ELECTRIC VEHICLES) and HV (Hybrid Vehicles) and PHV (Plug-in Hybrid Vehicles)) that cannot utilize engine waste heat or utilizes engine waste heat to be limited uses a refrigerant circuit that constitutes a heat pump as a heat source. In addition, in order to regulate the temperature of the air in the vehicle interior via a heat medium such as water instead of directly exchanging heat between the refrigerant in the refrigerant circuit and the air in the vehicle interior, a heat medium circuit is used in which a heat medium having a high temperature by heat radiation of the refrigerant circuit is caused to flow to a heater of the air conditioning apparatus during heating and a heat medium having a low temperature by heat absorption of the refrigerant circuit is caused to flow to a cooler of the air conditioning apparatus during cooling (see patent document 1 below).
Prior art literature
Patent literature
Patent document 1 Japanese patent application laid-open No. 2015-123829
Disclosure of Invention
Technical problem to be solved by the invention
In a conventional air conditioner for a vehicle, a heat medium circuit is configured to flow a heat medium to an air heat medium heat exchanger in an HVAC (Heating, ventilation, and air conditioning) unit for air conditioning in a vehicle room, to flow the heat medium to an external heat exchanger (radiator) for heat absorption by external air or the like, and to flow the heat medium to a heat exchanger for temperature adjustment of a vehicle-mounted heat generating device such as a battery or a motor for temperature adjustment of the vehicle-mounted heat generating device.
In an air conditioner for a vehicle including such a heat medium circuit, the heat medium flowing in the heat medium circuit exchanges heat in the various heat exchangers in addition to heat exchange in the refrigerant heat medium heat exchanger of the refrigerant circuit. However, when considering the balance of the refrigerant circuit, depending on the operation state of the air conditioner, the balance of the refrigerant circuit may be maintained only by the air heat medium heat exchange in the HVAC unit and the heat absorption and radiation in the refrigerant heat medium heat exchanger, and in this case, if the heat medium absorbs or radiates heat in the other heat exchangers in the heat medium circuit, the balance of the refrigerant circuit is unnecessarily broken, and the stable state of the refrigerant circuit cannot be maintained.
The present invention addresses the above-described situation. That is, the present invention has an object to maintain a stable state of a refrigerant circuit in an operating state of an air conditioner in which the balance of the refrigerant circuit is maintained.
Technical proposal adopted for solving the technical problems
In order to solve the above-described problems, one embodiment of the present invention has the following configuration.
Specifically, an air conditioner for a vehicle according to one aspect of the present invention includes a refrigerant circuit, a heat medium circuit having a high-temperature heat medium flow path in which a high-temperature heat medium heated by heat radiation of the refrigerant circuit flows and a low-temperature heat medium cooled by heat absorption of the refrigerant circuit flows, and an air conditioning unit including an air heat exchanger provided in the heat medium circuit and disposed in an air flow path to be supplied into a vehicle interior, wherein the heat medium circuit includes at least an external heat exchanger that exchanges heat between the heat medium and external air, and includes a flow path switching unit that separates the external heat exchanger from the high-temperature heat medium flow path and the low-temperature heat medium flow path.
Effects of the invention
According to the air conditioning apparatus for a vehicle of the present invention including the above-described features, the stable state of the refrigerant circuit can be maintained in the operating state of the air conditioner in which the balance of the refrigerant circuit is maintained.
Drawings
Fig. 1 is an explanatory diagram showing a schematic configuration of an air conditioner for a vehicle according to an embodiment of the present invention.
Fig. 2 is a block diagram showing a schematic configuration of a control unit of an air conditioner for a vehicle according to an embodiment of the present invention.
Fig. 3 is an explanatory diagram showing the flow of the heat medium when the first mode related to dehumidification and heating is performed in the vehicle air conditioning apparatus according to the embodiment of the present invention.
Fig. 4 is an explanatory diagram showing the flow of the heat medium when the second mode related to dehumidification and heating is performed in the vehicle air conditioning apparatus according to the embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same symbols in different drawings denote the same functional parts, and repetitive description in the drawings is appropriately omitted.
As shown in fig. 1, the vehicle air conditioner 1 according to the embodiment of the present invention includes a refrigerant circuit R as a heat source, a heat medium circuit 10 for circulating a heat medium whose temperature is controlled by heat exchange with a refrigerant, and an air conditioner unit 80 and a separate air conditioner unit 90 for supplying air whose temperature is controlled by heat exchange with the heat medium circulating in the heat medium circuit 10 into a vehicle interior.
In the example shown in fig. 1, the refrigerant circuit R is a closed circuit in which a compressor 11, a condenser 12, an expansion valve 13, an evaporator 14, and a receiver 15 are connected in this order by refrigerant piping, and in which a refrigerant is circulated. The refrigerant circuit R may be a circuit including a receiver downstream of the condenser 12, for example.
The heat medium circuit 10 includes a high-temperature heat medium flow path 20, a low-temperature heat medium flow path 30, a heat storage flow path 40, an outdoor flow path 50, an air-conditioning flow path 70, a tank 55, and first, second, and third flow path switching portions V1, V2, and V3 as flow path switching portions.
The high-temperature heat medium flow path 20 includes a high-temperature heat exchanger 21 (heating unit), and the high-temperature heat exchanger 21 is integrated with the condenser 12 in the refrigerant circuit R, performs heat exchange between the heat medium and the refrigerant, and circulates the heat medium pumped by the first pump P1 while passing through the high-temperature heat exchanger 21 by radiating heat from the refrigerant in the condenser 12 in the refrigerant circuit R.
The low-temperature heat medium flow path 30 includes a low-temperature heat exchanger 31 (cooling unit), and the low-temperature heat exchanger 31 is integrated with the evaporator 14 in the refrigerant circuit R2, performs heat exchange between the heat medium and the refrigerant, and circulates the heat medium pumped by the second pump P2 while passing through the low-temperature heat exchanger 31 by absorbing heat from the refrigerant in the evaporator 14 in the refrigerant circuit R2.
The heat storage flow path 40 includes a plurality of heat storage portions that exchange heat with the heat medium and store heat of the heat medium. As the heat storage portion provided in the heat storage flow path 40, a heat exchanger provided in an in-vehicle device that generates heat in response to driving of the battery heat exchanger 41, the motor heat exchanger 42, the inverter heat exchanger 43, the PCU heat exchanger 44, and the like, may be used, the battery heat exchanger 41 performing temperature adjustment of a battery in an electric vehicle, the motor heat exchanger 42 performing temperature adjustment of a running motor, the inverter heat exchanger 43 performing temperature adjustment of an inverter, and the PCU heat exchanger 44 performing temperature adjustment of a power control unit. This makes it possible to use the heat of the heat medium after heat storage and the heat generated by each in-vehicle device in air conditioning. In the heat storage flow path 40, the heat medium is pumped by the third pump P3, and the heat exchanger 41 for a flow cell, the heat exchanger 42 for a motor, the heat exchanger 43 for an inverter, and the heat exchanger 44 for a PCU are provided.
In the heat storage flow path 40, a first heat storage flow path 401 including the battery heat exchanger 41 and a second heat storage flow path 402 including the motor heat exchanger 42, the inverter heat exchanger 43, and the PCU heat exchanger 44 are connected via a second flow path switching portion V2. Further, by controlling the second channel switching unit V2, the first heat storage channel 401 and the second heat storage channel 402 can be independent channels or connected channels.
The outdoor flow path 50 includes an outdoor heat exchanger 45 that exchanges heat with the outside air.
The air conditioning flow path 70 includes a first heat exchanger 81 and a second heat exchanger 82 which are provided in the air conditioning unit 80 and exchange heat between the heat medium and the air blown into the vehicle interior, and a first split heat exchanger 91 and a second split heat exchanger 92 which are provided in the split air conditioning unit 90 and exchange heat between the heat medium and the air blown into each seat.
In this way, in the vehicle air conditioning apparatus 1, the flow paths of the heat medium circuit 10, that is, the high-temperature heat medium flow path 20, the low-temperature heat medium flow path 30, the heat storage flow path 40, the outdoor flow path 50, and the air conditioning flow path 70 are connected via the first flow path switching portion V1, the second flow path switching portion V2, and the third flow path switching portion V3, which are flow path switching portions. The control unit 100 described later controls the first, second, and third flow path switching units V1, V2, and V3 to switch the connection state of the flow paths to be independent flow paths or partially connected flow paths.
The tank 55 is connected between the first flow path switching portion V1 and the third flow path switching portion V3 via the inflow port 52, between the third flow path switching portion V3 and the motor heat exchanger 42 via the inflow port 54, and between the second flow path switching portion V2 and the second pump P2 via the outflow port 53.
A connection portion 28 connected to the inflow port 52 is provided between the first flow path switching portion V1 and the third flow path switching portion V3. A connection portion 48 connected to the inflow port 54 is provided between the third flow path switching portion V3 and the motor heat exchanger 42. A connection portion 38 connected to the outflow port 53 is provided between the second flow path switching portion V2 and the second pump P2.
In addition, a relief valve 57 is provided in the vicinity of the inlet 52 in the path from the connection portion 28 to the inlet 52 of the tank 55. Similarly, a relief valve 58 is provided in the vicinity of the inlet 54 in the path from the connection portion 48 to the inlet 54 of the tank 55.
In this way, in the flow path through which the high-temperature heat medium circulates, the heat medium expands due to the temperature rise of the high-temperature heat medium, and when the amount of the heat medium increases relative to the circuit capacity of the flow path through which the high-temperature heat medium circulates, the relief valve 57 or the relief valve 58 is opened, and the heat medium flows from the flow path through which the high-temperature heat medium circulates into the tank 55 through the inflow port 52 or the inflow port 54.
On the other hand, in the low-temperature heat medium circulation flow path, when the temperature of the low-temperature heat medium decreases and the heat medium contracts, the capacity of the heat medium becomes smaller than the circuit capacity of the low-temperature heat medium circulation flow path, and therefore, the heat medium stored in the tank 55 flows out from the outflow port 53 and flows into the low-temperature heat medium circulation flow path via the connection portion 38.
On the other hand, when the temperature of the heat medium circulating in the low-temperature heat medium flow path 30 decreases and the heat medium contracts, the heat medium stored in the tank 55 flows out from the outflow port 53 and flows into the low-temperature heat medium flow path 30 via the connection portion 38.
As the heat medium to be circulated in the heat medium circuit 10, water to which no additive is added, water mixed with additives such as an antifreezing agent and a preservative, or a liquid heat medium such as oil may be used.
The air conditioning unit 80 includes a suction port 83 that sucks air (outside air or inside air) into the air conditioning unit 80, a blower 87 that blows the air sucked from the suction port 83 to an air flow path 84, a first heat exchanger 81 and a second heat exchanger 82 that are provided in the air flow path 84 and through which a heat medium circulating in the heat medium circuit 10 flows, and an air mixing damper 89 that adjusts a ratio of ventilation of the air in the air flow path 84 after the first heat exchanger 81 to the second heat exchanger 82.
In the air conditioning unit 80, the air introduced from the air inlet 83 into the air flow path 84 is ventilated only to the first heat exchanger 81 or to both the first heat exchanger 81 and the second heat exchanger 82, and the temperature-regulated air is blown into the vehicle interior by heat exchange with the heat medium in the first heat exchanger 81 and the second heat exchanger 82.
The split air conditioner 90 includes a first split heat exchanger 91 and a second split heat exchanger 92 for flowing a heat medium circulating in the heat medium circuit 10, and a three-way valve 95 (flow rate adjusting unit) that controls inflow of the heat medium into the first split heat exchanger 91 and the second split heat exchanger 92 and is capable of adjusting the flow rate, and the split air conditioner 90 blows air flowing through one or both of the first split heat exchanger 91 and the second split heat exchanger 92 into the vehicle interior.
The first split heat exchanger 91 and the second split heat exchanger 92 are provided in an air flow path, which is a path through which air introduced from an independent suction port and blown by a blower flows.
In this way, in the vehicle air conditioning apparatus 1, the flow paths of the heat medium circuit 10, that is, the high-temperature heat medium flow path 20, the low-temperature heat medium flow path 30, the heat storage flow path 40, the outdoor flow path 50, and the air conditioning flow path 70 are connected via the first flow path switching portion V1, the second flow path switching portion V2, and the third flow path switching portion V3, which are flow path switching portions. The control unit 100 described later controls the first, second, and third flow path switching units V1, V2, and V3 to switch the connection state of the flow paths to be independent flow paths or partially connected flow paths.
That is, the high-temperature heat medium flow path 20 and the low-temperature heat medium flow path 30 of the heat medium circuit 10 are connected to any one of the heat storage flow path 40, the outdoor flow path 50, and the air-conditioning flow path 70 according to the air-conditioning purpose and the target air-conditioning temperature, and the control unit 100 controls the first flow path switching unit V1, the second flow path switching unit V2, the third flow path switching unit V3, and the three-way valves 85 and 95 so that the heat medium flows in the connected flow paths.
As a result, the heat medium whose temperature has been adjusted in one or both of the high-temperature heat medium flow field 20 and the low-temperature heat medium flow field 30 flows into the connected heat exchanger among the first heat exchanger 81, the second heat exchanger 82, the first split heat exchanger 91, and the second split heat exchanger 92 through the first flow path switching unit V1, the second flow path switching unit V2, the third flow path switching unit V3, and the three-way valves 85 and 95, and air conditioning in the vehicle cabin is performed.
Fig. 2 shows a schematic configuration of a control unit 100 that is responsible for controlling the vehicle air conditioner 1. In fig. 2, the configuration that is not directly related to the operation of the vehicle air conditioner 1 according to the present embodiment is appropriately omitted from illustration and description.
The control unit 100 is connected to a vehicle controller (ECU) 200 via a vehicle communication bus, and transmits and receives information, and the vehicle controller 200 is responsible for controlling the entire vehicle including driving control of a running motor, an inverter, and a power control unit, and charge/discharge control of a battery. A microcomputer as an example of a computer including a processor can be applied to both the control unit 100 and the vehicle controller 200.
The following sensors and devices are connected to the control unit 100, and outputs of the sensors and the like are input. Specifically, the control unit 100 is connected to a temperature sensor TC21 that detects the temperature of the heat medium flowing into the high-temperature heat exchanger 21 and heated by the condenser 12, a temperature sensor TC31 that detects the temperature of the heat medium flowing into the low-temperature heat exchanger 31 and cooled by the evaporator 14, a temperature sensor TC80 that detects the temperature of the heat medium flowing into the first heat exchanger 81 and the second heat exchanger 82 of the air conditioning unit 80, a temperature sensor TC90 that detects the temperature of the heat medium flowing into the first split heat exchanger 91 and the second split heat exchanger 92 of the split air conditioning unit 90, a battery temperature sensor TC41 (either the temperature of the battery itself or the temperature of the heat medium flowing into the battery heat exchanger 41) and a temperature sensor TC42 (either the temperature of the motor itself, the temperature of the heat medium flowing into the motor heat exchanger 42 or the temperature of the heat medium flowing out of the motor heat exchanger 42), an inverter temperature sensor TC43 (either the temperature of the inverter itself, the temperature of the heat exchanger 43 flowing into the heat exchanger 43 or the heat medium flowing out of the heat exchanger 43 flowing out of the motor heat exchanger 42) and a temperature sensor PCU 44 (either the temperature sensor TC 44) that detects the temperature of the heat medium flowing into the battery heat exchanger 41 or the PCU.
On the other hand, the output of the control unit 100 is connected to the expansion valve 13, the first pump P1, the second pump P2, the third pump P3, the first flow path switching unit V1, the second flow path switching unit V2, the third flow path switching unit V3, the three-way valves 85, 95, the blower 87, and the air mixing damper 89. The control unit 100 controls the outputs of the sensors, the setting input from the air conditioning operation unit 300, and the information from the vehicle controller 200.
The operation of the air conditioner 1 for a vehicle configured as described above will be described below. In the vehicle air conditioner 1 of the present embodiment, various operation modes such as a heating mode, a cooling mode, a dehumidifying mode, and a temperature adjustment mode including cooling or warming up of the in-vehicle device using the air conditioner 80 or the separate air conditioner 90 can be executed, for example.
In executing the above-described various operation modes, the refrigerant circuit R of the vehicle air conditioner 1 appropriately controls the rotation number of the compressor 11 and the like by the control unit 100, and adjusts the air supplied into the vehicle interior to a target temperature or humidity by utilizing the heat radiation of the condenser 12 and the heat absorption of the evaporator 14, thereby performing air conditioning in the vehicle interior. In the refrigerant circuit R, the refrigerant circulates as follows.
That is, the high-pressure gas refrigerant discharged from the compressor 11 exchanges heat with the heat medium flowing through the high-temperature heat exchanger 21 in the condenser 12, and is condensed by heat radiation and liquefaction, thereby becoming a high-pressure liquid refrigerant. The high-pressure liquid refrigerant flowing out of the condenser 12 is depressurized and expanded by the expansion valve 13, becomes low-pressure refrigerant, and flows into the evaporator 14. The low-pressure refrigerant flowing into the evaporator 14 is evaporated by heat exchange with the heat medium flowing through the low-temperature heat exchanger 31 in the evaporator 14, flows out of the evaporator 14 as a gas refrigerant, and returns to the compressor 11 via the accumulator 15.
In the vehicle air conditioner according to the present embodiment, when the interior of the vehicle is dehumidified and heated, a plurality of types of dehumidification and heating modes in which the connection states of the flow paths in the heat medium circuit 10 are different from each other can be executed. The plurality of dehumidification and heating modes are executed by the control unit 100 controlling the first flow path switching unit V1, the second flow path switching unit V2, the third flow path switching unit V3, and the three-way valves 85 and 95 in accordance with the operation state of the vehicle air conditioner and the traveling state of the vehicle, thereby switching the connection states of the flow paths of the heat medium circuit 10.
The first mode and the second mode among the plurality of dehumidification and heating modes will be described below with reference to fig. 3 and 4, respectively. In each figure, a black solid line indicates a high-temperature heat medium circulation pipe, a dash-dot line indicates a low-temperature heat medium circulation pipe, and a gray solid line indicates a medium-temperature heat medium circulation pipe between a high temperature and a low temperature.
(1) First mode
The first mode is a dehumidification and heating mode in which the heat medium heated in the high-temperature heat exchanger 21 is circulated between the high-temperature heat medium flow path 20 and the air-conditioning flow path 70, heating in the vehicle interior is performed by the second heat exchanger 82, heating in each seat is performed by the first split heat exchanger 91 and the second split heat exchanger 92, and dehumidification in the vehicle interior is performed by flowing the low-temperature heat medium in the low-temperature heat medium flow path 30 to the first heat exchanger 81. The heat medium is circulated between the heat storage flow path 40 and the outdoor flow path 50, and waste heat of the battery heat exchanger 41, the motor heat exchanger 42, the inverter heat exchanger 43, and the PCU heat exchanger 44 is dissipated in the outdoor heat exchanger 45.
In the first mode, the control unit 100 controls the first flow path switching unit V1 and the three-way valves 85 and 95 such that the high-temperature heat medium flowing in the high-temperature heat medium flow path 20 flows to the second heat exchanger 82, the first split heat exchanger 91, and the second split heat exchanger 92 of the air-conditioning flow path 70, and the low-temperature heat medium flowing in the low-temperature heat medium flow path 30 flows to the first heat exchanger 81 of the air-conditioning flow path 70.
The control unit 100 controls the second flow path switching unit V2 so that the low-temperature heat medium flowing in the low-temperature heat medium flow path 30 bypasses the heat storage flow path 40 and the outdoor flow path 50 and returns to the second pump P2. The control unit 100 further controls the second channel switching unit V2 to circulate the heat medium between the heat storage channel 40 and the outdoor channel 50.
Fig. 3 shows the flow of the heat medium in the first mode.
As shown in fig. 3, when the first mode is performed, the heat medium circulates as follows.
The heat medium heated by heat exchange with the refrigerant flowing through the condenser 12 in the high-temperature heat exchanger 21 of the high-temperature heat medium flow field 20 flows into the three-way valve 85 through the first flow field switching unit V1. A part of the heat medium flowing into the three-way valve 85 flows into the second heat exchanger 82, and the remaining part flows into the three-way valve 95.
The heat medium flowing into the second heat exchanger 82 exchanges heat with the air flowing through the air flow path 84, and then flows into the merging portion 72. The heat medium flowing into the three-way valve 95 is split so as to flow into the first split heat exchanger 91 and the second split heat exchanger 92, exchanges heat with air flowing through an air flow path (not shown) in each of the first split heat exchanger 91 and the second split heat exchanger 92, merges at the merging portion 71, and flows into the merging portion 72.
The heat medium merged at the merging portion 72 passes through the first flow path switching portion V1 and the third flow path switching portion V3, returns to the high-temperature heat medium flow path 20, is pressure-fed to the high-temperature heat exchanger 21 by the first pump P1, and repeats the above cycle.
On the other hand, the heat medium cooled by heat exchange with the refrigerant flowing through the evaporator 14 in the low-temperature heat exchanger 31 of the low-temperature heat medium flow path 30 flows into the first heat exchanger 81 of the air conditioning flow path 70 through the first flow path switching unit V1, and exchanges heat with the air flowing through the air flow path 84. The heat medium flowing out of the first heat exchanger 81 returns to the low-temperature heat medium flow path 30 through the first flow path switching unit V1 and the second flow path switching unit V2, is pumped by the second pump P2 to the low-temperature heat exchanger 31, and the cycle is repeated.
The heat medium that does not exchange heat with the high-temperature heat exchanger 21 or the low-temperature heat exchanger 31 circulates between the heat storage flow path 40 and the outdoor flow path 50. That is, the heat medium flows through the flow cell heat exchanger 41 by the third pump P3, flows to the outdoor flow path 50 via the second flow path switching unit V2, and exchanges heat with the outside air in the outdoor heat exchanger 45 to dissipate heat. The heat medium flowing out of the outdoor heat exchanger 45 flows through the PCU heat exchanger 44, the inverter heat exchanger 43, and the motor heat exchanger 42 in this order through the second flow path switching unit V2, returns to the third pump P3 through the third flow path switching unit V3 and the second flow path switching unit V2, and repeats the above cycle.
As described above, in the vehicle air conditioner 1, the second heat exchanger 82, the first split heat exchanger 91, and the second split heat exchanger 92 can heat the air supplied into the vehicle interior for heating, and the first heat exchanger 81 can dehumidify the air supplied into the vehicle interior. Further, waste heat of each in-vehicle device can be radiated in parallel with dehumidification and heating of the vehicle interior.
The first mode is mainly a mode executed when the operation condition of the vehicle air conditioner 1 is stable, that is, when the balance of the refrigerant circuit R is maintained by only heat absorption and radiation in the first heat exchanger 81, the second heat exchanger 82, the first split heat exchanger 91 and the second split heat exchanger 92, and the high-temperature heat exchanger 21 and the low-temperature heat exchanger 31.
In this case, when the heat medium absorbs or radiates heat in the other heat exchangers in the heat medium circuit 10, the balance of the refrigerant circuit R is unnecessarily broken, and the stable state of the refrigerant circuit R cannot be maintained, so that the first flow path switching unit V1, the second flow path switching unit V2, and the third flow path switching unit V3 are controlled so that the heat storage flow path 40 and the outdoor flow path 50 are separated from the high-temperature heat medium flow path 20, the low-temperature heat medium flow path 30, and the air-conditioning flow path 70 to form independent flow paths.
As a result, the heat medium circulating in the high-temperature heat medium flow path 20, the low-temperature heat medium flow path 30, and the air-conditioning flow path 70 does not flow to the battery heat exchanger 41, the motor heat exchanger 42, the inverter heat exchanger 43, the PCU heat exchanger 44, and the outdoor heat exchanger 45 of the outdoor flow path 50, and therefore, the stable state of the refrigerant circuit R can be maintained in the operating state of the air-conditioner in which the balance of the refrigerant circuit R is maintained.
(2) Second mode
The first mode is a dehumidification and heating mode in which the heat stored in the motor heat exchanger 42, the inverter heat exchanger 43, and the PCU heat exchanger 44 of the heat storage flow path 40 is used to heat the vehicle interior by the second heat exchanger 82, the first split heat exchanger 91 and the second split heat exchanger 92 are used to heat each seat, and the low-temperature heat medium cooled in the low-temperature heat medium flow path 30 is caused to flow to the first heat exchanger 81 to dehumidify the vehicle interior.
In the second mode, the control unit 100 controls the first flow path switching unit V1 and the three-way valves 85 and 95 such that the high-temperature heat medium flowing in the high-temperature heat medium flow path 20 flows to the second heat exchanger 82, the first split heat exchanger 91, and the second split heat exchanger 92 of the air-conditioning flow path 70, and the low-temperature heat medium flowing in the low-temperature heat medium flow path 30 flows to the first heat exchanger 81 of the air-conditioning flow path 70.
The control unit 100 controls the second flow path switching unit V2 such that the high-temperature heat medium flowing in the high-temperature heat medium flow path 20 flows to the motor heat exchanger 42, the inverter heat exchanger 43, the PCU heat exchanger 44, and the outdoor heat exchanger 45 of the outdoor flow path 50 in the first heat storage flow path 401, and the low-temperature heat medium flowing in the low-temperature heat medium flow path 30 bypasses the heat storage flow path 40 and the outdoor flow path 50 and returns to the second pump P2. The control unit 100 further controls the second channel switching unit V2 so as to circulate the heat medium in the first heat storage channel 401.
Fig. 4 shows the flow of the heat medium in the second mode.
As shown in fig. 4, when the second mode is performed, the heat medium circulates as follows.
The heat medium heated by heat exchange with the refrigerant flowing through the condenser 12 in the high-temperature heat exchanger 21 of the high-temperature heat medium flow field 20 flows into the three-way valve 85 through the first flow field switching unit V1. A part of the heat medium flowing into the three-way valve 85 flows into the second heat exchanger 82, and the remaining part flows into the three-way valve 95.
The heat medium flowing into the second heat exchanger 82 exchanges heat with the air flowing through the air flow path 84, and then flows into the merging portion 72. The heat medium flowing into the three-way valve 95 is split so as to flow into the first split heat exchanger 91 and the second split heat exchanger 92, exchanges heat with air flowing through an air flow path (not shown) in each of the first split heat exchanger 91 and the second split heat exchanger 92, merges at the merging portion 71, and flows into the merging portion 72.
The heat medium that merges at the merging portion 72 flows into the outdoor flow path 50 through the first flow path switching portion V1, the third flow path switching portion V3, and the second flow path switching portion V2, exchanges heat with the outside air in the outdoor heat exchanger 45, and flows into the heat storage flow path 40 through the second flow path switching portion V2. The heat medium flowing into the second heat storage flow path 402 of the heat storage flow path 40 flows into the PCU heat exchanger 44, the inverter heat exchanger 43, and the motor heat exchanger 42 in this order, passes through the third flow path switching portion V3, returns to the high-temperature heat medium flow path 20, is pressure-fed to the high-temperature heat exchanger 21 by the first pump P1, and the cycle described above is repeated.
On the other hand, the heat medium cooled by heat exchange with the refrigerant flowing through the evaporator 14 in the low-temperature heat exchanger 31 of the low-temperature heat medium flow path 30 flows into the first heat exchanger 81 of the air conditioning flow path 70 through the first flow path switching unit V1, and exchanges heat with the air flowing through the air flow path 84. The heat medium flowing out of the first heat exchanger 81 returns to the low-temperature heat medium flow path 30 through the first flow path switching unit V1 and the second flow path switching unit V2, is pumped by the second pump P2 to the low-temperature heat exchanger 31, and the cycle is repeated.
In the first heat storage flow path 401, the heat medium is pumped by the third pump P3 to flow through the battery heat exchanger 41, and the heat medium is returned to the third pump P3 again through the second flow path switching unit V2, whereby the cycle is repeated.
As described above, in the vehicle air conditioner 1, the second heat exchanger 82, the first split heat exchanger 91, and the second split heat exchanger 92 can heat the air supplied into the vehicle interior for heating, and the first heat exchanger 81 can dehumidify the air supplied into the vehicle interior. Further, the variation in temperature of each cell in the battery can be reduced.
The second mode is mainly executed when the air conditioning in the vehicle air conditioner 1 is in a stable state after a predetermined time elapses from the start. By circulating the high-temperature heat medium flowing in the high-temperature heat medium flow path 20 also in the second heat storage flow path 402 of the heat storage flow path 40, dehumidification and heating in the vehicle interior can be continued by utilizing heat generated in each device or heat stored by sequentially flowing the PCU heat exchanger 44, the inverter heat exchanger 43, and the motor heat exchanger 42 included in the second heat storage flow path 402.
Therefore, the output of the compressor 11 (for example, intermittent operation, rotation speed reduction, suspension operation, etc.) can be reduced to suppress the power consumption of the vehicle air conditioner 1. That is, in the vehicle air conditioner that adjusts the temperature of the air in the vehicle interior using the refrigerant circuit R as a heat source and the heat medium flowing through the heat medium circuit, efficient dehumidification and heating can be performed with less power consumption.
As described above, in the vehicle air conditioner according to the present embodiment, the dehumidification and heating modes include a plurality of modes in which the circulation paths of the heat medium are different from each other, and therefore, the dehumidification and heating can be appropriately switched according to the operation state of the vehicle air conditioner and the traveling state of the vehicle. In a situation where the air conditioning in the vehicle interior is stable and the temperature is not required to be so high, the output of the compressor 11 is reduced using the second mode, and dehumidification and heating are performed with less power consumption.
On the other hand, when the operation state of the vehicle air conditioner 1 is stable, that is, when the stable state of the refrigerant circuit R is maintained, the first mode is executed, whereby the heat storage flow path 40 and the outdoor flow path 50 are separated from the high-temperature heat medium flow path 20, the low-temperature heat medium flow path 30, and the air conditioner flow path 70, and thus independent flow paths are formed. The other in-vehicle heat exchanger and the other outdoor heat exchanger are separated from the high-temperature heat exchanger 21 and the low-temperature heat exchanger 31 that exchange heat between the refrigerant and the heat medium, and the first heat exchanger 81, the second heat exchanger 82, the first split heat exchanger 91, and the second split heat exchanger 92 that exchange heat between the refrigerant and the air supplied into the vehicle interior. Thus, the heat medium circulating in the high-temperature heat medium flow field 20, the low-temperature heat medium flow field 30, and the air-conditioning flow field 70 does not flow to each of the in-vehicle heat exchanger and the outdoor heat exchanger 45.
Therefore, according to the vehicle air conditioning apparatus of the present embodiment, in the vehicle air conditioning apparatus that adjusts the temperature of the air in the vehicle interior using the refrigerant circuit as the heat source through the heat medium flowing in the heat medium circuit, the stable state of the refrigerant circuit can be maintained while maintaining the balanced air conditioning operation state of the refrigerant circuit. Further, by maintaining the stable state of the refrigerant circuit, the comfort of the air conditioner can be improved, and the power consumption can be reduced.
Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configurations are not limited to these embodiments, and the present invention is also included in the present invention even if the design changes and the like do not depart from the spirit and scope of the present invention. The above embodiments can be combined by using mutual techniques as long as there is no particular contradiction or problem in the purpose, structure, and the like.
Symbol description
1 Air conditioner for vehicle
10, A heat medium loop, 11, a compressor, 12, a condenser, 13, an expansion valve, 14, an evaporator and 15, a storage tank
20: High-temperature heat medium flow path, 21:high-temperature heat exchanger, 30:low-temperature heat medium flow path, 31:low-temperature heat exchanger
40 Heat storage flow path
41 Battery heat exchanger, 42 motor heat exchanger, 43 inverter heat exchanger, 44 PCU heat exchanger, 45 outdoor heat exchanger, 50 outdoor flow path
55:Tank, 70:air-conditioning flow path
80 Air conditioning unit, 81 first heat exchanger, 82 second heat exchanger
85. 95 Three-way valve
90 Split air conditioning unit, 91 first split heat exchanger, 92 second split heat exchanger
R refrigerant circuit
V1:first flow path switching part, v2:second flow path switching part, v3:third flow path switching part
Claims (3)
1. An air conditioning apparatus for a vehicle, comprising:
a refrigerant circuit;
A heat medium circuit having a high-temperature heat medium flow path in which a high-temperature heat medium heated by heat radiation of the refrigerant circuit flows and a low-temperature heat medium flow path in which a low-temperature heat medium cooled by heat absorption of the refrigerant circuit flows, and
An air conditioning unit in which an air heat medium heat exchanger provided in the heat medium circuit is disposed in an air flow path for supplying air into a vehicle interior,
The heat medium circuit
At least an exterior heat exchanger that exchanges heat between a heat medium and an exterior gas, and a flow path switching unit that separates the exterior heat exchanger from the high-temperature heat medium flow path and the low-temperature heat medium flow path.
2. The vehicular air-conditioning apparatus according to claim 1, wherein,
The flow path switching means connects the flow path of the heat medium flowing in the exterior heat exchanger and the flow path of the heat medium flowing in the battery temperature adjustment heat exchanger to form an independent flow path.
3. The vehicular air-conditioning apparatus according to claim 2, wherein,
An in-vehicle heat generating device temperature adjustment heat exchanger is provided in the independent flow path, the in-vehicle heat generating device temperature adjustment heat exchanger being provided on a downstream side of the exterior heat exchanger and on an upstream side of the battery temperature adjustment heat exchanger.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022-100455 | 2022-06-22 | ||
| JP2022100455A JP2024001656A (en) | 2022-06-22 | 2022-06-22 | Vehicular air conditioner |
| PCT/JP2023/019687 WO2023248714A1 (en) | 2022-06-22 | 2023-05-26 | Vehicle air-conditioning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN119365354A true CN119365354A (en) | 2025-01-24 |
Family
ID=89379797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202380045910.9A Pending CN119365354A (en) | 2022-06-22 | 2023-05-26 | Car air conditioning unit |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2024001656A (en) |
| CN (1) | CN119365354A (en) |
| WO (1) | WO2023248714A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5581886B2 (en) * | 2010-08-11 | 2014-09-03 | 株式会社日立製作所 | Vehicle air conditioning system |
| JP6064753B2 (en) * | 2013-04-05 | 2017-01-25 | 株式会社デンソー | Thermal management system for vehicles |
| JP7173064B2 (en) * | 2019-02-28 | 2022-11-16 | 株式会社デンソー | thermal management system |
-
2022
- 2022-06-22 JP JP2022100455A patent/JP2024001656A/en active Pending
-
2023
- 2023-05-26 WO PCT/JP2023/019687 patent/WO2023248714A1/en active Application Filing
- 2023-05-26 CN CN202380045910.9A patent/CN119365354A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023248714A1 (en) | 2023-12-28 |
| JP2024001656A (en) | 2024-01-10 |
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