Vehicular heat pump air-conditioning system and defrosting method for vehicular heat pump air-conditioning exterior unit

Abstract

The invention relates to a vehicular air-conditioning system and a defrosting control method for an air-conditioning exterior unit. The vehicular air-conditioning system solves the problems that an existing vehicular air-conditioner only has the single function of refrigeration, indoor heating is realized by using engine cooling water for heating air, heating and temperature rise cycle is long, and a defrosting effect is poor. The technical scheme includes that the vehicular air-conditioning system comprises an exterior unit assembly, a blower motor and a compressor, the flow direction of refrigerants among pipelines and the flow direction of air in an air duct are controlled by correspondingly opening and closing a plurality of electromagnetic valves and two air doors, and the working conditions of heating, refrigerating and defrosting of the vehicular air-conditioning system are realized. The vehicular air-conditioning system is simple in structure, high in heating efficiency, fine in performance, low in manufacturing cost, simple and convenient in control and capable of realizing the working conditions of heating, refrigerating and defrosting.

Description

technical field [0001] The invention relates to a vehicle-mounted air-conditioning system and a method for controlling defrosting of an air-conditioning external unit. Background technique [0002] At present, the air-conditioning system widely used in automobiles can only meet the requirements of cooling conditions in summer, while the heating conditions in winter use the engine cooling water with a higher temperature to heat the air to meet the comfort requirements in the car. With the advancement of science and the continuous development of the automobile industry, the efficiency of automobile engines is getting higher and higher, which makes the waste heat that the engine can use for heating in winter conditions less and less. For safety and comfort requirements, a longer The heating cycle and slow defrosting effect are unacceptable. At present, the auxiliary heating methods added in the automobile manufacturing industry, such as electric heating, damping heating, etc., ...

AI Technical Summary

Problems solved by technology

With the advancement of science and the continuous development of the automobile industry, the efficiency of automobile engines is getting higher and higher, which makes the waste heat that the engine can use for heating in winter conditions less and less. For safety and comfort requirements, a longer The heating cycle and slow defrosting effect are unacceptable. At present, the auxiliary heating methods added in the automobile manufacturing industry, such as electric heating, damping heating, etc., have high remanufacturing costs, poor performance, and insufficient heating efficiency.

[0003] Moreover, due to the complex driving environment of the vehicle, when the temperature is low in winter, when the surface temperature of the radiator of the outdoor unit is lower than the dew point temperature, condensed water is easily generated on the surface, and frost will occur when the condensed water temperature is lower than 0°C , when the frost is serious, the ventilation area between the cooling fins of the heat exchanger will be partially or completely occupied by frost, thereby increasing the thermal resistance and wind resistance, and directly affecting its heat exchange efficiency, so the heat dissipation in the external unit assembly can be quickly and effectively eliminated Frosting on device surfaces is a problem for researchers

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