WO2015141210A1 - Air conditioning device for vehicle - Google Patents

Air conditioning device for vehicle Download PDF

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Publication number
WO2015141210A1
WO2015141210A1 PCT/JP2015/001438 JP2015001438W WO2015141210A1 WO 2015141210 A1 WO2015141210 A1 WO 2015141210A1 JP 2015001438 W JP2015001438 W JP 2015001438W WO 2015141210 A1 WO2015141210 A1 WO 2015141210A1
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WO
WIPO (PCT)
Prior art keywords
refrigerant
heat exchanger
coolant
water
flow path
Prior art date
Application number
PCT/JP2015/001438
Other languages
French (fr)
Japanese (ja)
Inventor
健太朗 黒田
圭俊 野田
勝志 谷口
雄士 小寺
一郎 舘野
Original Assignee
パナソニックIpマネジメント株式会社
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
Priority to JP2014055095A priority Critical patent/JP2015174645A/en
Priority to JP2014-055095 priority
Application filed by パナソニックIpマネジメント株式会社 filed Critical パナソニックIpマネジメント株式会社
Publication of WO2015141210A1 publication Critical patent/WO2015141210A1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60HARRANGEMENTS OR ADAPTATIONS OF HEATING, COOLING, VENTILATING, OR OTHER AIR-TREATING DEVICES SPECIALLY FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00Heating, cooling or ventilating [HVAC] devices
    • B60H1/32Cooling devices
    • B60H1/3204Cooling devices using compression
    • B60H1/323Cooling devices using compression characterised by comprising auxiliary or multiple systems, e.g. plurality of evaporators, or by involving auxiliary cooling devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60HARRANGEMENTS OR ADAPTATIONS OF HEATING, COOLING, VENTILATING, OR OTHER AIR-TREATING DEVICES SPECIALLY FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B60H1/00814Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
    • B60H1/00878Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
    • B60H1/00899Controlling the flow of liquid in a heat pump system
    • B60H1/00921Controlling 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60HARRANGEMENTS OR ADAPTATIONS OF HEATING, COOLING, VENTILATING, OR OTHER AIR-TREATING DEVICES SPECIALLY FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00Heating, cooling or ventilating [HVAC] devices
    • B60H1/02Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plant or systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B5/00Compression machines, plant, or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02Compression machines, plant, or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B6/00Compression machines, plant, or systems, with several condenser circuits
    • F25B6/04Compression machines, plant, or systems, with several condenser circuits arranged in series
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2339/00Details of evaporators; Details of condensers
    • F25B2339/04Details of condensers
    • F25B2339/047Water-cooled condensers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B25/00Machines, plant, or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • F25B25/005Machines, plant, or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00 using primary and secondary systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/25Control of valves
    • F25B2600/2519On-off valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19Pressures
    • F25B2700/193Pressures of the compressor
    • F25B2700/1931Discharge pressures
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21Temperatures
    • F25B2700/2116Temperatures of a condenser
    • F25B2700/21161Temperatures of a condenser the fluid cooled by the condenser

Abstract

This air conditioning device for a vehicle comprises a first water-refrigerant heat exchanger, a second water-refrigerant heat exchanger, a heater core, and a bypass flow path. The first water-refrigerant heat exchanger causes heat exchange between a low-temperature, low-pressure refrigerant and a coolant for heat transport and vaporizes the refrigerant. The second water-refrigerant heat exchanger causes heat exchange between the coolant and a high-temperature, high-pressure refrigerant that is discharged from a compressor that compresses the refrigerant, and condenses the refrigerant. The heater core uses the coolant that has been subjected to heat exchange by the second water-refrigerant heat exchanger to heat air that is blown into the vehicle interior. The bypass flow path branches from a coolant flow path and bypasses the second water-refrigerant heat exchanger, said coolant flow path leading from a cooling path for a heat-generating component of the vehicle to the second water-refrigerant heat exchanger.

Description

Air conditioner for vehicles

The present invention relates to a vehicle air conditioner.

Conventionally, as a heating device for a vehicle, a hot water heater that heats a vehicle interior by using a high-temperature engine coolant is often used. Patent Document 1 can improve the heating performance over the existing one by adding a configuration that heats the coolant of the hot water heater using a heat pump while using an existing hot water heater as a basis. An air conditioner for a vehicle is disclosed. The vehicle air conditioner of Patent Document 1 has a configuration in which a coolant for cooling the engine is introduced again into the engine through the condenser, the heater core, and the evaporator in this order in series. In the vehicle air conditioner disclosed in Patent Document 1, the heating performance is improved by further heating the engine coolant with the refrigerant discharged from the compressor in the condenser.

Japanese Patent Laid-Open No. 10-076837

The present invention provides a vehicle air conditioner that adjusts a water refrigerant condenser and a water refrigerant evaporator to an appropriate water flow rate and drives a coolant cycle with good performance.

The vehicle air conditioner according to an aspect of the present invention includes a first water refrigerant heat exchanger, a second water refrigerant heat exchanger, a heater core, and a bypass flow path. The first water refrigerant heat exchanger vaporizes the refrigerant by exchanging heat between the low-temperature and low-pressure refrigerant and the coolant for heat transport. The second water refrigerant heat exchanger condenses the refrigerant by exchanging heat between the high-temperature and high-pressure refrigerant discharged from the compressor that compresses the refrigerant and the coolant. The heater core heats the air blown into the vehicle interior using the coolant that has been heat-exchanged by the second water-refrigerant heat exchanger. The bypass flow path branches off from the coolant flow path from the cooling passage of the heat generating component of the vehicle to the second water refrigerant heat exchanger and bypasses the second water refrigerant heat exchanger.

In this configuration, the water refrigerant condenser and the water refrigerant evaporator can be adjusted to an appropriate water flow rate, and the coolant cycle can be driven with good performance.

The figure which shows the structure of the vehicle air conditioner which concerns on embodiment of this invention. The flowchart explaining operation | movement of the heat pump heating control part of embodiment. The flowchart explaining the modification of operation | movement of the heat pump heating control part of embodiment. The figure explaining the modification of a structure of the vehicle air conditioner of embodiment

Prior to the description of the embodiment of the present invention, problems in the conventional vehicle air conditioner will be described. In order to drive the coolant cycle with good performance, the proper water flow rate differs between the condenser and the evaporator. For example, at the time of heating operation when the engine temperature is low and the coolant temperature is low, if the water flow rate in the condenser is reduced, the coolant in the condenser can be sufficiently heated. Therefore, the water temperature of the coolant can be raised.

On the other hand, when the water flow rate in the evaporator is reduced, the evaporation of the refrigerant in the evaporator does not function normally, the refrigerant pressure balance is lowered, and the heating performance may be lowered.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a vehicle air conditioner according to an embodiment of the present invention.

The vehicle air conditioner 1 according to the embodiment of the present invention is mounted on a vehicle having an engine (an internal combustion engine) as a heat generating component, and performs air conditioning in the passenger compartment.

The vehicle air conditioner 1 includes a component unit 10, a compressor (compressor) 38, an engine cooling unit 40, a heater core 44, an evaporator 48, an expansion valve 37, an outdoor condenser 39, a check valve 15, and a connection therebetween. It has coolant piping, refrigerant piping, and the like. The heater core 44 and the evaporator 48 are disposed in an intake passage of an HVAC (Heating, Ventilation, and Air Conditioning) 70. The HVAC 70 is provided with a fan F1 through which intake air flows.

The compressor 38 is driven by engine power or electricity to compress the sucked refrigerant into a high temperature and high pressure and discharge it. The compressed refrigerant is sent to the constituent unit 10. The low-pressure refrigerant is drawn from the first water refrigerant heat exchanger 11 or the evaporator 48 of the constituent unit 10 into the compressor 38 via the junction pipe.

The engine cooling unit 40 includes a water jacket for flowing a coolant around the engine and a pump for flowing the coolant to the water jacket, and releases heat from the engine to the coolant flowing in the water jacket. The pump is rotated by the power of the engine, for example. The engine cooling unit 40 may be provided with a radiator that releases heat to the outside air when the amount of exhaust heat of the engine increases. The coolant passage of the engine cooling unit 40 communicates with the heater core 44 through the constituent unit 10.

The coolant is an antifreeze such as LLC (Long Life Coolant), and is used for transporting heat.

The configuration for transferring the coolant may be only the pump of the engine cooling unit 40. Thereby, the cost of the apparatus can be reduced and the installation space of the apparatus can be reduced. In order to increase the transfer capability of the coolant, a pump may be added to another portion of the coolant pipe.

The heater core 44 is a device that exchanges heat between the coolant and air, and is disposed in the intake passage of the HVAC 70 that supplies air into the passenger compartment. Heated coolant is supplied to the heater core 44 and releases heat to intake air (air blown into the vehicle compartment) that is sent into the vehicle compartment during heating operation. The heater core 44 can adjust the amount of air passing through the opening of the door 44a. The door 44a can be opened and closed by electrical control. The door 44a is also called an air mix door.

The evaporator 48 is a device that exchanges heat between the low-temperature and low-pressure refrigerant and the air, and is disposed in the intake passage of the HVAC 70. The evaporator 48 is supplied with low-temperature and low-pressure refrigerant during the cooling operation, the dehumidifying operation, or the temperature control operation, and cools the intake air (air blown into the vehicle interior) supplied to the vehicle interior.

The expansion valve 37 expands the high-pressure refrigerant to a low temperature and low pressure and discharges it to the evaporator 48. The expansion valve 37 is disposed in the vicinity of the evaporator 48. The expansion valve 37 may be a thermal expansion valve (TXV) having a function of automatically adjusting the amount of refrigerant discharged according to the temperature of the refrigerant sent from the evaporator 48.

The outdoor condenser 39 has a passage through which the refrigerant flows and a passage through which the air flows. For example, the outdoor condenser 39 is disposed near the top of the vehicle in the engine room and exchanges heat between the refrigerant and the outside air. A high-temperature and high-pressure refrigerant is passed through the outdoor condenser 39 in the cooling mode and the dehumidifying mode, and heat is discharged from the refrigerant to the outside air. Outside air is blown onto the outdoor condenser 39 by, for example, a fan. A reservoir tank 39 a may be provided on the refrigerant delivery side of the outdoor condenser 39.

The configuration unit 10 is an integrated configuration that is produced in a factory as a single unit, and is connected to another configuration of the vehicle air conditioner 1 by piping in the vehicle assembly process. The constituent unit 10 may be integrated by accommodating each constituent element in one housing, or may be integrated by joining the constituent elements.

The component unit 10 includes a first water refrigerant heat exchanger 11, a second water refrigerant heat exchanger 12, an on-off valve 13, and an expansion valve 14 with a solenoid valve.

The first water refrigerant heat exchanger 11 (evaporator) has a passage through which a low-temperature and low-pressure refrigerant flows and a passage through which a cooling liquid flows, and performs heat exchange between the refrigerant and the cooling liquid. In the first water refrigerant heat exchanger 11, a low-temperature and low-pressure refrigerant is introduced from the expansion valve with electromagnetic valve 14 in a predetermined operation mode, and heat is transferred from the coolant to the low-temperature and low-pressure refrigerant. Thereby, the 1st water refrigerant | coolant heat exchanger 11 vaporizes a low-temperature / low pressure refrigerant | coolant.

The coolant inlet of the first water-refrigerant heat exchanger 11 is connected to the heater core 44 via a pipe, and the coolant outlet is connected to the engine cooling unit 40 via the pipe. The refrigerant inlet of the first water-refrigerant heat exchanger 11 is connected to the expansion valve 14 with a solenoid valve via a pipe, and the refrigerant outlet is connected to a pipe that joins the inlet of the compressor 38.

The second water refrigerant heat exchanger 12 (condenser) has a passage through which a high-temperature and high-pressure refrigerant flows and a passage through which a cooling liquid flows, and performs heat exchange between the refrigerant and the cooling liquid. The second water refrigerant heat exchanger 12 is supplied with a high-temperature and high-pressure refrigerant from the compressor 38 in a predetermined operation mode, and releases heat from the high-temperature and high-pressure refrigerant to the coolant. Thereby, the 2nd water refrigerant | coolant heat exchanger 12 condenses a high temperature / high pressure refrigerant | coolant.

The coolant introduction port of the second water refrigerant heat exchanger 12 is communicated with the engine cooling unit 40 via a pipe, and the coolant outlet is communicated with the heater core 44 via the pipe. The refrigerant inlet of the second water refrigerant heat exchanger 12 is communicated with the outlet of the compressor 38 via a pipe, and the refrigerant outlet is connected to the on-off valve 13 and the expansion valve 14 with a solenoid valve via a branch pipe. It is communicated to.

The on-off valve 13 switches the opening and closing of the refrigerant pipe by, for example, electrical control. The on-off valve 13 is composed of, for example, an electromagnetic valve.

The expansion valve 14 with a solenoid valve can be switched between opening and closing of the refrigerant pipe by, for example, electrical control, and functions as an expansion valve when opened. When the expansion valve 14 with a solenoid valve functions as an expansion valve, a temperature type expansion valve (TXV: Thermal Expansion) that automatically adjusts the refrigerant flow rate based on the refrigerant temperature at the refrigerant outlet of the first water refrigerant heat exchanger 11. (Valve).

The check valve 15 is provided in a refrigerant pipe between the compressor 38 and the evaporator 48, and prevents the refrigerant from flowing back in an operation mode in which the refrigerant does not flow through the outdoor condenser 39 and the evaporator 48. Here, an operation mode in which the on-off valve 13 is closed and the refrigerant flows through the refrigerant circuit passing through the first water refrigerant heat exchanger 11 and the second water refrigerant heat exchanger 12 will be considered. In this operation mode, since the on-off valve 13 is closed, the refrigerant circuit passing through the outdoor condenser 39 and the evaporator 48 is shut off. However, even in this case, when the outside air is low, the refrigerant pressure in the outdoor condenser 39 and the evaporator 48 may be low. When this pressure drop occurs, the refrigerant flowing in the refrigerant circuits of the first water refrigerant heat exchanger 11 and the second water refrigerant heat exchanger 12 flows back to the refrigerant circuit on the evaporator 48 side. As a result, the refrigerant amount of the refrigerant circuit passing through the first water refrigerant heat exchanger 11 and the second water refrigerant heat exchanger 12 deviates from the optimum range, and the efficiency of this heat pump cycle is lowered. However, the presence of the check valve 15 can avoid such inconvenience.

The temperature sensor 16 detects the temperature of the coolant (also called water temperature) and outputs a water temperature signal indicating the water temperature to the heat pump heating control unit 52. The temperature sensor 16 detects, for example, the inlet temperature of the coolant of the second water / refrigerant heat exchanger 12. The temperature sensor 16 may detect the temperature of other locations as long as the temperature of the coolant flowing in the second water refrigerant heat exchanger 12 such as the outlet temperature of the engine cooling unit 40 can be estimated.

The pressure sensor 17 detects the refrigerant discharge pressure of the compressor 38 and outputs a refrigerant pressure signal indicating the pressure to the heat pump heating control unit 52. The pressure sensor 17 may detect the pressure of the refrigerant at other locations as long as it can estimate the refrigerant discharge pressure.

The heat pump heating control unit 52 can be composed of a microcomputer or a sequencer. The heat pump heating control unit 52 performs open / close control between the open / close valve 13 and the expansion valve 14 with solenoid valve, and mainly performs switching control of the heat pump heating mode.

The bypass flow path 18 branches from a pipe communicating the engine cooling unit 40 and the second water refrigerant heat exchanger 12, and communicates with a pipe communicating the heater core 44 and the first water refrigerant heat exchanger 11. The second water refrigerant heat exchanger 12 and the heater core 44 are bypassed.

The bypass channel 18 is provided with an on-off valve 19 (corresponding to a flow rate adjusting unit). The on-off valve 19 opens and closes the coolant pipe by, for example, electrical control. The on-off valve 19 is composed of, for example, an electromagnetic valve.

The heat pump heating control unit 52 is accommodated in a control box integrated with the constituent unit 10. The control box may be separated from the configuration of the mechanical system of the configuration unit 10.

Information for determining whether or not the heat pump heating mode is necessary is input to the heat pump heating control unit 52. Specifically, this information is switch information (heat pump heating activation signal) indicating ON / OFF of a heat pump heating switch (not shown). The user can operate the heat pump heating switch. When the user turns on the heat pump heating switch and a heat pump heating activation signal is input, the heat pump heating control unit 52 can determine that the transition to the heat pump heating mode is necessary.

In the heat pump heating control unit 52, as information for determining whether or not the heat pump heating mode is necessary, environmental information such as outside air temperature information, vehicle interior temperature information, and coolant temperature information, and vehicle interior temperature setting are set. Information or the like may be input. Further, as information for determining whether or not the heat pump heating mode is necessary, state information of the vehicle air conditioner 1 such as opening information of the door 44a may be included. All of the information need not be input, and only some information may be input. Based on these pieces of information, the heat pump heating control unit 52 may detect that heat such as engine exhaust heat is insufficient for heating and determine that the transition to the heat pump heating mode is necessary. it can.

The heat pump heating control unit 52 inputs the water temperature signal of the temperature sensor 16 and the refrigerant pressure signal of the pressure sensor 17. The heat pump heating control unit 52 outputs a water channel switching control signal for switching the water circuit by opening and closing the on-off valve 19. The heat pump heating control unit 52 may control the flow rate of the bypass passage 18 as well as the on-off valve 19 being fully closed and fully opened. In this case, the opening degree of the on-off valve 19 may be controlled stepwise or steplessly by open / close duty control or throttling control, or the number of rotations of the pump that transfers the coolant may be controlled.

[Water channel switching control in heat pump heating mode]
FIG. 2 is a flowchart for explaining the operation of the heat pump heating control unit of the embodiment. The heat pump heating control unit 52 executes the control of FIG. 2 in the heat pump heating mode.

When the heat pump heating mode is entered, the heat pump heating control unit 52 first controls the on-off valve 19 to close the coolant path, the engine cooling unit 40, the second water refrigerant heat exchanger 12 and the heater core 44. The route is switched to a route (referred to as a normal route) (step ST1). If the route is originally a normal route, it is left as it is.

Next, the heat pump heating control unit 52 repeatedly executes the loop process of steps ST2 to ST6.

In step ST2, the heat pump heating control unit 52 takes in the output of the temperature sensor 16 and acquires water temperature information.

In steps ST3 and ST5, the heat pump heating control unit 52 determines whether the water temperature exceeds the threshold value T1 or whether the water temperature is lower than the threshold value T2.

Here, the threshold T1 is equal to or greater than the threshold T2. The threshold value T1 is set to such a temperature that the temperature of the coolant in the second water refrigerant heat exchanger 12 is high and the amount of heat given from the coolant to the coolant is reduced. The threshold value T2 is set to such a temperature that the temperature of the coolant in the second water / refrigerant heat exchanger 12 is low and the amount of heat given to the air sent from the heater core 44 to the passenger compartment is reduced.

As a result of the comparison, if the water temperature exceeds the threshold value T1, the heat pump heating control unit 52 controls the on-off valve 19 to be closed and switches the coolant path to the normal path (step ST4). If the route is originally a normal route, it is left as it is.

On the other hand, if the water temperature is below the threshold value T2, the heat pump heating control unit 52 controls the opening of the on-off valve 19 to switch the coolant path to the bypass path using the bypass flow path 18 (step ST6). If it is originally a bypass route, it is left as it is.

If the water temperature is between the threshold value T1 and the threshold value T2, “NO” is determined in steps ST3 and ST5, and the loop process is continued with the current water circuit.

Even when the threshold value T1 and the threshold value T2 are set to the same value, the heat pump heating control unit 52 performs the same process as in FIG. In this case, when the water temperature is higher than the threshold value T1 (= threshold value T2), the heat pump heating control unit 52 controls to close the on-off valve 19 and switches the coolant path to the normal path (step ST4). Further, when the water temperature is lower than the threshold value T1 (= threshold value T2), the heat pump heating control unit 52 opens the on-off valve 19 to switch the coolant path to the bypass path using the bypass channel 18 (step) ST6). When the water temperature is the same as the threshold value T1 (= threshold value T2), the heat pump heating control unit 52 keeps the normal route when it is originally a normal route, and when it is a bypass route, Keep bypass path.

By such control, when heat release from the engine to the coolant cannot be expected in the engine cooling unit 40, such as when the engine is cold started, the coolant introduced from the engine cooling unit 40 to the second water refrigerant heat exchanger 12 Is switched to a bypass route using the bypass channel 18. As a result, the flow rate of the coolant introduced into the second water refrigerant heat exchanger 12 can be reduced, and the coolant can be rapidly heated by the second water refrigerant heat exchanger 12, so that the quick warming can be improved. it can.

[Modified example of waterway switching control]
FIG. 3 is a flowchart illustrating a modification of the operation of the heat pump heating control unit of the embodiment. The heat pump heating control unit 52 may execute the control of FIG. 3 in the heat pump heating mode.

In this control, the heat pump heating control unit 52 first controls the on-off valve 19 to be closed and switches the coolant path to the normal path (step ST11). If the route is originally a normal route, it is left as it is.

Next, the heat pump heating control unit 52 repeatedly executes the loop process of steps ST12 to ST20.

In step ST12, the heat pump heating control unit 52 takes in the output of the pressure sensor 17 and acquires information on the pressure of the refrigerant (for example, the discharge pressure of the compressor 38).

In steps ST13, ST15, and ST18, it is determined whether the refrigerant pressure exceeds the threshold value P1, is between the threshold value P2 and the threshold value P3, or is lower than the threshold value P4.

Here, the threshold value P1, the threshold value P2, the threshold value P3, and the threshold value P4 are set to values that gradually decrease in this order. Further, the threshold value P1 and the threshold value P2 may be the same value. Further, the threshold value P3 and the threshold value P4 may be the same value. That is, the relationship of threshold value P1 ≧ threshold value P2> threshold value P3 ≧ threshold value P4 may be satisfied.

The threshold value P1 is near the upper limit of the refrigerant pressure, and is set to a value that stops the compressor 38. The threshold value P2 is set to a value that can re-drive the stopped compressor 38. The threshold value P3 is set to a value at which the amount of heat given from the refrigerant to the coolant in the second water refrigerant heat exchanger 12 is small and the pressure level of the refrigerant in the heat pump cycle is high. The threshold P4 is set to a value at which the refrigerant is excessively cooled by the coolant in the second water refrigerant heat exchanger 12 and the pressure level of the refrigerant in the heat pump cycle is lowered.

As a result of the comparison, if the refrigerant pressure exceeds the threshold value P1 (step ST13), the heat pump heating control unit 52 outputs a command to stop the compressor 38 (step ST14). If the compressor 38 is originally stopped, it is left as it is.

On the other hand, if the refrigerant pressure is between the threshold value P1 and the threshold value P2, “NO” is determined in steps S13, ST15, and ST18, and this loop process is continued as it is.

If the refrigerant pressure is between the threshold value P2 and the threshold value P3, the heat pump heating control unit 52 outputs a command to drive the compressor 38 (step ST16). If the compressor 38 is originally driven, it is left as it is. Furthermore, the heat pump heating control unit 52 controls the closing of the on-off valve 19 to switch the coolant path to the normal path (step ST17). If the route is originally a normal route, it is left as it is.

Further, if the refrigerant pressure is between the threshold value P3 and the threshold value P4, the determination of “NO” is made in steps S13, ST15, and ST18, and this loop processing is continued as it is.

If the refrigerant pressure is below the threshold value P4, the heat pump heating control unit 52 outputs a command to drive the compressor 38 (step ST19). If the compressor 38 is originally driven, it is left as it is. Further, the opening / closing valve 19 is controlled to open, and the coolant path is switched to the bypass path (step ST20). If it is originally a bypass route, it is left as it is.

Even when the threshold value P1 and the threshold value P2 are set to the same value, and the threshold value P3 and the threshold value P4 are set to the same value, the heat pump heating control unit 52 performs the process of FIG. Switching can be performed. In this case, when the refrigerant pressure is higher than threshold value P1 (= threshold value P2) (YES in step ST13), heat pump heating control unit 52 outputs a command to stop compressor 38 (step ST14).

Further, the heat pump heating control unit 52 outputs a command to drive the compressor 38 when the refrigerant pressure is lower than the threshold value P2 (= threshold value P1) and higher than the threshold value P3 (= threshold value P4) (YES in step ST15) ( After step ST16), the coolant path is switched to the normal path (step ST17).

Further, when the refrigerant pressure is lower than the threshold value P4 (= threshold value P3) (YES in step ST18), the heat pump heating control unit 52 outputs a command for driving the compressor 38 (step ST19), and then controls the opening / closing valve 19 to open. Then, the coolant path is switched to the bypass path (step ST20). When the refrigerant pressure is the same as the threshold value P4 (= threshold value P3), the heat pump heating control unit 52 originally keeps the normal route when it is a normal route, and when it is a bypass route. Leave the bypass path.

By such control, when the coolant delivered from the engine cooling unit 40 becomes extremely high and the refrigerant pressure in the heat pump cycle approaches the upper limit, the compressor 38 stops. On the other hand, in a situation where the temperature of the coolant delivered from the engine cooling unit 40 is high and the refrigerant pressure in the heat pump cycle becomes a high value, switching to the normal path is performed, the refrigerant pressure is reduced, and the heat pump operation is performed. Will continue. In a situation where the temperature of the coolant delivered from the engine cooling unit 40 is low and the refrigerant pressure in the heat pump cycle is low, the refrigerant pressure is increased by switching to the bypass path, and the heat pump operation is performed. Will continue. By such switching, the heat pump operation can be continued and high heating performance can be exhibited regardless of the temperature of the cooling water delivered from the engine cooling unit 40.

[Variation of bypass route]
Drawing 4 is a figure explaining the modification of the composition of the air-conditioner for vehicles of an embodiment. FIG. 4 is different from FIG. 1 in that the bypass channel 18 is changed to a bypass channel 20.

The bypass channel 20 branches from a pipe that communicates the engine cooling unit 40 and the second water refrigerant heat exchanger 12, communicates with a pipe that communicates the second water refrigerant heat exchanger 12 and the heater core 44, This is a flow path that bypasses the two-water refrigerant heat exchanger 12. An open / close valve 19 is provided in the bypass channel 20.

The embodiment of the present invention has been described above. In the present embodiment, the condition based on the inlet water temperature of the second water refrigerant heat exchanger 12 or the condition based on the discharge pressure of the compressor 38 is exemplified as the condition for switching the water circuit. In addition to this, the location of the detected water temperature and the location of the detected refrigerant pressure may be other locations. Moreover, what is necessary is just to select an appropriate value by the experiment etc. for the threshold value of the water temperature for switching the water circuit or the threshold value of the refrigerant pressure.

In the present embodiment, the engine is described as an example of the heating part of the vehicle. However, various heating components such as an electric motor for traveling in an electric vehicle and a secondary battery that supplies electric power for traveling may be adopted as the heating component of the vehicle.

In the present embodiment, the on-off valve 13 provided in the refrigerant pipe is controlled to open and close, whereby the compressor 38, the second water refrigerant heat exchanger 12, the expansion valve 14 with the electromagnetic valve, and the first water refrigerant heat exchanger. 11, and the second refrigerant circuit that circulates in the order of the compressor 38, the second water refrigerant heat exchanger 12, the outdoor condenser 39, and the evaporator 48. However, the refrigerant path is not limited to this. For example, the second water refrigerant heat exchanger 12 is included in the second refrigerant circuit, but the second water refrigerant heat exchanger 12 may be excluded from the second refrigerant circuit. That is, the second refrigerant circuit may be a refrigerant circuit that circulates in the order of the compressor 38, the outdoor condenser 39, and the evaporator 48.

The present invention can be used for a vehicle air conditioner mounted on various vehicles such as an engine vehicle, an electric vehicle, or a hybrid vehicle (HEV).

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 10 Configuration unit 11 1st water-refrigerant heat exchanger 12 2nd water-refrigerant heat exchanger 13, 19 On-off valve 14 Expansion valve 15 with solenoid valve Check valve 16 Temperature sensor 17 Pressure sensor 18, 20 Bypass flow Path 37 Expansion valve 38 Compressor 39 Outdoor condenser 40 Engine cooling part 44 Heater core 44a Door 48 Evaporator 52 Heat pump heating control part 70 HVAC

Claims (8)

  1. A first water refrigerant heat exchanger that exchanges heat between a low-temperature and low-pressure refrigerant and a coolant for heat transport to vaporize the refrigerant;
    A second water refrigerant heat exchanger that causes heat exchange between the high-temperature and high-pressure refrigerant discharged from the compressor that compresses the refrigerant and the coolant, and condenses the refrigerant;
    A heater core that heats air blown into the vehicle interior using the coolant that has been heat-exchanged by the second water-refrigerant heat exchanger;
    A bypass flow path that branches from the coolant flow path from the cooling passage of the heat generating component of the vehicle to the second water refrigerant heat exchanger and bypasses the second water refrigerant heat exchanger;
    Vehicle air conditioner.
  2. The coolant circulates in the order of the cooling passage, the second water refrigerant heat exchanger, the heater core, and the first water refrigerant heat exchanger.
    The vehicle air conditioner according to claim 1.
  3. The bypass flow path branches from the coolant flow path from the cooling passage to the second water refrigerant heat exchanger, and flows the coolant from the heater core to the first water refrigerant heat exchanger. Communicating with the flow path,
    The vehicle air conditioner according to claim 1 or 2.
  4. The bypass flow path branches from the cooling liquid flow path from the cooling passage to the second water refrigerant heat exchanger, and flows the cooling liquid from the second water refrigerant heat exchanger to the heater core. Communicating with the flow path,
    The vehicle air conditioner according to claim 1 or 2.
  5. A flow rate adjusting unit for adjusting the flow rate of the bypass flow path;
    The vehicle air conditioner according to any one of claims 1 to 4.
  6. A heat pump heating control unit for controlling the flow rate adjustment unit based on the temperature of the coolant or the pressure of the refrigerant;
    The vehicle air conditioner according to claim 5.
  7. The heat pump heating control unit controls the flow rate adjusting unit to flow the cooling liquid to the bypass channel when the temperature of the cooling liquid is lower than a predetermined temperature.
    The vehicle air conditioner according to claim 6.
  8. The heat pump heating control unit controls the flow rate adjusting unit to flow the cooling liquid to the bypass flow path when the pressure of the refrigerant is lower than a predetermined pressure.
    The vehicle air conditioner according to claim 6.
PCT/JP2015/001438 2014-03-18 2015-03-16 Air conditioning device for vehicle WO2015141210A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2014055095A JP2015174645A (en) 2014-03-18 2014-03-18 Vehicular air conditioner
JP2014-055095 2014-03-18

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WO2015141210A1 true WO2015141210A1 (en) 2015-09-24

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WO (1) WO2015141210A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN106482263A (en) * 2016-11-16 2017-03-08 东莞市瑞社冷热设备有限公司 Evaporating air conditioner

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US5289698A (en) * 1992-09-14 1994-03-01 General Motors Corporation Modular nested vapor compression heat pump for automotive applications
JP2001304660A (en) * 2000-04-25 2001-10-31 Ntt Data Corp Air conditioner and its control method
JP2002096630A (en) * 2000-09-22 2002-04-02 Sanden Corp Vehicle air conditioner
JP2006515241A (en) * 2002-12-20 2006-05-25 ダイムラークライスラー・アクチェンゲゼルシャフト Automobile air conditioning method
JP2007069733A (en) * 2005-09-07 2007-03-22 Valeo Thermal Systems Japan Corp Heating element cooling system using air conditioner for vehicle
JP2013126844A (en) * 2011-12-19 2013-06-27 Valeo Japan Co Ltd Electric heating type hot water heating apparatus, vehicle air-conditioning apparatus provided therewith, and vehicle

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Publication number Priority date Publication date Assignee Title
US5289698A (en) * 1992-09-14 1994-03-01 General Motors Corporation Modular nested vapor compression heat pump for automotive applications
JP2001304660A (en) * 2000-04-25 2001-10-31 Ntt Data Corp Air conditioner and its control method
JP2002096630A (en) * 2000-09-22 2002-04-02 Sanden Corp Vehicle air conditioner
JP2006515241A (en) * 2002-12-20 2006-05-25 ダイムラークライスラー・アクチェンゲゼルシャフト Automobile air conditioning method
JP2007069733A (en) * 2005-09-07 2007-03-22 Valeo Thermal Systems Japan Corp Heating element cooling system using air conditioner for vehicle
JP2013126844A (en) * 2011-12-19 2013-06-27 Valeo Japan Co Ltd Electric heating type hot water heating apparatus, vehicle air-conditioning apparatus provided therewith, and vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106482263A (en) * 2016-11-16 2017-03-08 东莞市瑞社冷热设备有限公司 Evaporating air conditioner

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