What is the driving force of automobile air conditioning?

Working power comes from air-conditioning compressor, which is generally driven by engine.

Automobile air-conditioning compressor is the heart of automobile air-conditioning refrigeration system, which plays the role of compressing and conveying refrigerant vapor. According to the different working principles, air-conditioning compressors can be divided into fixed displacement compressors and variable displacement compressors.

The displacement of constant displacement compressor increases proportionally with the increase of engine speed. The power output cannot be changed automatically according to the refrigeration demand, which has a great influence on the engine fuel consumption. Generally, it is controlled by collecting the temperature signal at the outlet of evaporator. When the temperature reaches the set temperature, the electromagnetic clutch of the compressor is released and the compressor stops working. When the temperature rises, the electromagnetic clutch is engaged and the compressor starts to work. Constant displacement compressor is also controlled by the pressure of air conditioning system. When the pressure in the pipeline is too high, the compressor stops working.

The variable displacement compressor can automatically adjust the power output according to the set temperature. The air conditioning control system does not collect the temperature signal of the evaporator outlet, but controls the compression ratio of the compressor according to the pressure change signal in the air conditioning pipeline, and automatically adjusts the outlet temperature. In the whole refrigeration process, the compressor has been working, and the adjustment of refrigeration intensity depends entirely on the pressure regulating valve installed inside the compressor. When the pressure at the high pressure end of the air conditioning pipeline is too high, the pressure regulating valve will shorten the piston stroke in the compressor to reduce the compression ratio, which will reduce the refrigeration intensity. When the high-pressure end pressure drops to a certain extent and the low-pressure end pressure rises to a certain extent, the pressure regulating valve increases the piston stroke and improves the refrigeration intensity.