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Electric vehicle heat pump air conditioning system and defrosting method thereof

A heat pump air conditioner, electric vehicle technology, applied in electric vehicles, vehicle components, vehicle energy storage, etc., can solve problems such as overheating loss, reduced cruising range of electric buses, and reduced system energy efficiency, and achieves improved efficiency, cruising range. The effect of system energy efficiency

Active Publication Date: 2021-05-11
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the compressor of the air-conditioning system is prone to overheating during operation, which will lead to overheating loss and reduce the energy efficiency of the system, which indirectly leads to the reduction of the cruising range of the electric bus

Method used

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  • Electric vehicle heat pump air conditioning system and defrosting method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0036]A heat pump air conditioning system for an electric vehicle, which is provided with a refrigerant circuit, the refrigerant circuit has an in-vehicle heat exchanger 9 serving as a condenser during heating operation, an outdoor heat exchanger 12 serving as an evaporator during heating operation, and a Flow device 8, compressor 4. Specifically, the connection relationship between these components is: the exhaust port of the compressor is connected to the indoor heat exchanger 9, the other end of the indoor heat exchanger is connected to the throttling device 8, and the other end of the throttling device is connected to the outdoor heat exchanger 12 , the other end of the outdoor heat exchanger is connected to the suction port of the compressor. The refrigeration system can realize the heating of the indoor heat exchanger 9 .

[0037] The electric vehicle is equipped with a power battery 5, and the air conditioning system also includes a heat accumulator 6 and a defrosting ...

Embodiment 1

[0053] Such as figure 1 As shown, the electric vehicle heat pump air conditioning system according to the embodiment of the first aspect of the present invention includes a refrigerant circuit, specifically including a compressor 4, a four-way reversing valve 2, an in-vehicle heat exchanger 9, an electronic expansion valve 8, The outdoor heat exchanger 12 and the gas-liquid separator 3, specifically, the connection relationship between these components is: the exhaust port of the compressor is connected to the fourth port of the four-way reversing valve 2, and the first port of the four-way reversing valve is connected to Indoor heat exchanger 9, the other end of the indoor heat exchanger is connected to the electronic expansion valve 8, the other end of the electronic expansion valve is connected to the outdoor heat exchanger 12, and the other end of the outdoor heat exchanger 12 is connected to the third port, the second port of the electronic expansion valve is connected to...

Embodiment 2

[0071] Based on the same inventive concept, combined with the above-mentioned scheme, such as figure 1 As shown, the present invention also provides a defrosting method according to the above electric vehicle heat pump air conditioning system.

[0072] When the defrost management system detects that defrosting is required, the defrost management system controls and dynamically adjusts the refrigerant flow into the bypass circuit and throttling device.

[0073] Optionally, the dynamic adjustment includes: when the defrosting management system detects that the outdoor temperature T1 ≥ the first preset value of the outdoor temperature, further judging the value of the low pressure saturation temperature T2: when T2 < the first preset value of the low pressure saturation temperature , control the regulating valve to start dynamic adjustment, rationally distribute the refrigerant flow into the phase change heat accumulator and the refrigerant flow into the throttling device; when T...

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Abstract

The invention provides an electric vehicle heat pump air conditioning system and a defrosting method thereof. The system is provided with a heat accumulator, which can exchange heat with the power battery and the compressor of the electric vehicle, and store the heat generated by the power battery and the compressor. By controlling the regulating valve, defrosting can be started before frosting endangers the normal operation of the system. The defrosting process will neither reduce the heating capacity nor reduce the comfort of the human body, and can also improve the heating operation time of the heat pump air conditioning system at the same time. system energy efficiency. The system recovers the heat generated during the operation of the power battery and the compressor, heats the bypass refrigerant and defrosts the outdoor heat exchanger, which not only does not affect the heating and thermal comfort of the personnel during defrosting, but also improves the performance of the power battery. And the operating efficiency of the compressor, and improve the cruising range of the electric vehicle.

Description

technical field [0001] The invention relates to the technical field of automobile air conditioning, in particular to an electric vehicle air conditioning system and a defrosting method thereof. Background technique [0002] As people's requirements for environmental protection are getting higher and higher, the development of electric bus technology is becoming more and more mature, and the development of electric bus air conditioners is also becoming more and more mature. At present, electric bus air conditioners mainly include electric heating air conditioners and air source heat pump air conditioners. Since electric heating air conditioners will greatly reduce the cruising range of electric bus air conditioners, air source heat pump air conditioners are more and more common in electric bus applications. Air source heat pump air conditioners mainly include cooling-only type, heat pump type and heat pump + PTC, but the heat pump type and heat pump + PTC will cause frost on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60H1/00B60L58/26
CPCB60H1/00278B60H1/00385B60L58/26Y02T10/70
Inventor 陈付齐李珂王瑞强
Owner GREE ELECTRIC APPLIANCES INC
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