The car air conditioner controller should be able to control the evaporating temperature, superheat, compressor speed, electronic expansion valve opening, evaporator fan speed and car interior temperature at the same time according to certain performance indicators. Unlike household air conditioners, the speed of the car air conditioner compressor changes with the speed of the car engine.
The cooling capacity of the car air conditioner is greatly affected by the engine speed. Therefore, the car air conditioning control system is a multivariable control system. The coupling relationship of various control parameters affects the quality of the car air conditioning control system. Therefore, it is very important to design a controller with a simple precompensator to decouple the coupling system of the car air conditioner.
Air conditioning system is mainly composed of compressor accumulator, expansion valve and other equipment. In the traditional semi-mechanical control system, the constant-capacity compressor controls the start and stop of the compressor through the 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 be vaporized and absorbed in the evaporator. Heat, and it can also control the flow in the evaporator.
Traditional fixed-capacity compressors and expansion valves can no longer meet the requirements of high-efficiency and energy-saving automatic control. Therefore, it is necessary to study the control system of car air-conditioning with a new actuator. It adopts a multi-variable control strategy, and uses a variable speed compressor and an electronic expansion valve to comprehensively control the evaporation pressure and superheat.
In the experiment, a variable-speed compressor was simulated by a constant-capacity compressor driven by an AC motor, and an electronic expansion valve driven by a stepping motor was used for the experiment.
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