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Frosting and defrosting system and method for external heat exchanger of electric vehicle

A technology of electric vehicles and heat exchangers, applied in lighting and heating equipment, refrigeration safety arrangements, refrigerators, etc., can solve the problems of complex judgment and high cost, achieve comfort and heating efficiency, low cost, and avoid frequent cleaning frost effect

Active Publication Date: 2021-11-30
SDAAC AUTOMOTIVE AIR CONDITIONING SYST CO LTD SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judgment is complex and costly

Method used

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  • Frosting and defrosting system and method for external heat exchanger of electric vehicle
  • Frosting and defrosting system and method for external heat exchanger of electric vehicle
  • Frosting and defrosting system and method for external heat exchanger of electric vehicle

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Embodiment Construction

[0057] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0058] When the electric vehicle heat pump system is in heating operation, the external heat exchanger of the vehicle is easy to frost when the ambient temperature is 0-5°C and the humidity is above 60%, which will affect the heating performance of the heat pump system. When the external heat exchanger is used as the evaporator without frost, the heat transfer temperature difference between the evaporation temperature of the external heat exchanger and the ambient temperature is normally about 5-10°C. T...

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Abstract

The invention provides a frosting and defrosting system and method for an electric vehicle's external heat exchanger, including a compressor, an internal condenser, an evaporator, an external heat exchanger, a throttling device, an evaporator, and a refrigerant Temperature sensor, where: when it is in the heating mode, the refrigerant exhausted by the compressor enters the condenser inside the car to condense and release heat, and after being throttled by the throttling device, it enters the heat exchanger outside the car to evaporate and absorb heat, and the outlet of the heat exchanger outside the car The refrigerant returns to the compressor, and the refrigerant temperature sensor is set at the outlet of the heat exchanger outside the vehicle; when it is in the defrosting mode, the refrigerant exhausted by the compressor enters the heat exchanger outside the vehicle to condense and release heat, and the refrigerant temperature sensor detects the temperature outside the vehicle. The inlet temperature of the heat exchanger, the outlet refrigerant of the external heat exchanger is throttled by the throttling device, enters the evaporator and then returns to the compressor. The judging method of the invention is simple and accurate, and the cost is low; the parameters can be adjusted adaptively along with the use of the vehicle, taking into account the leakage of the refrigerant, the dirty and blocked heat exchanger outside the vehicle, and the like.

Description

technical field [0001] The invention relates to the field of heat pumps for electric vehicles, in particular to a frosting and defrosting system and method for an external heat exchanger of an electric vehicle. Background technique [0002] With the development of automobile technology, the share of electric vehicles in vehicles is getting higher and higher, and the heat pump air-conditioning technology of electric vehicles has been researched and applied more and more. Many models of electric vehicles at home and abroad have been equipped with heat pump air-conditioning systems. The external heat exchanger not only acts as a condenser but also as an evaporator in the heat pump air conditioning system, and is an important component in the heat pump air conditioning system. When the external heat exchanger is used as an evaporator, there is a problem of frosting. After frosting, the heat transfer effect is greatly reduced, which directly affects the heating effect of the heat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B47/02F25B49/02
CPCF25B47/025F25B49/02
Inventor 周国梁王明玉吴靖任亚超
Owner SDAAC AUTOMOTIVE AIR CONDITIONING SYST CO LTD SHANGHAI
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