The controller of a car air conditioner should be able to control evaporation temperature, superheat, compressor speed, opening of an electronic expansion valve, evaporator fan speed, and vehicle interior temperature according to a certain performance index. Unlike household air conditioners, the speed of the car air-conditioning compressor changes as the engine speed of the car changes.
The refrigerating capacity of the passenger car air conditioning is greatly affected by the engine speed, so the car air-conditioning control system is a multi-variable control system, and the relationship between the control parameters affects the quality of the car air-conditioning control system. Therefore, it is very important to design a controller with a simple pre-compensator for solving the sedan system of the car air conditioner.
The air conditioning system is mainly composed of compressor accumulators, expansion valves and other equipment. In a conventional semi-mechanical control system, a fixed-capacity compressor controls the on/off of the compressor through an electromagnetic clutch according to the evaporation temperature, and the thermal expansion valve reduces the pressure of the high-pressure liquid refrigerant to the evaporation pressure so that it can vaporize in the evaporator. Heat, in addition it can also control the flow to the evaporator.
Conventional fixed-capacity compressors and expansion valves have not been able to meet the requirements of high-efficiency and energy-saving automatic control. Therefore, the control system of the car air-conditioning must be studied with a new implementing agency. A multi-variable control strategy is adopted, and a variable-speed compressor and an electronic expansion valve are used to comprehensively control the evaporation pressure and the degree of superheat.
In the experiment, a variable-capacity compressor was simulated using a constant-capacity compressor driven by an AC motor, and an electronic expansion valve driven by a stepper motor was used for experiments.
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