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

A technology for electric vehicles and heat exchangers, applied in lighting and heating equipment, damage protection, refrigeration safety arrangements, etc., can solve the problems of complex judgment and high cost, and achieve the maintenance of comfort and heating efficiency, low cost, and simple judgment method. accurate effect

Active Publication Date: 2020-10-16
SDAAC AUTOMOTIVE AIR CONDITIONING SYST CO LTD SHANGHAI
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  • 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 automobile
  • Frosting and defrosting system and method for external heat exchanger of electric automobile
  • Frosting and defrosting system and method for external heat exchanger of electric automobile

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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 external heat exchanger of an electric automobile. The frosting and defrosting system comprises a compressor, an internal condenser, an evaporator, the external heat exchanger, a throttling device, the evaporator and a refrigerant temperature sensor; when the frosting and defrosting system is in a heating mode, an exhaust refrigerant of the compressor enters the internal condenser for condensation and heat release, after being throttled by the throttling device, the refrigerant enters the external heat exchanger for evaporation and heat absorption, the refrigerant at the outlet of the external heat exchanger returns to the compressor, and the refrigerant temperature sensor is arranged at the outlet end of the external heat exchanger; and when the frosting and defrosting system is in a defrosting mode, an exhaust refrigerant of the compressor enters the external heat exchanger for condensation and heat release, the refrigerant temperature sensor detects the inlet temperature of the external heat exchanger, and outlet refrigerant of the external heat exchanger enters the evaporator after being throttled by thethrottling device and then returns to the compressor. According to the frosting and defrosting system and method for the external heat exchanger of the electric automobile, the judgment method is simple, accurate and low in cost; parameters can be adjusted in a self-adaptive mode along with use of a vehicle; and the situations that a refrigerant leaks, and a heat exchanger outside the vehicle getsdirty and blocked are considered.

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 Applications(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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