Control system for adjusting opening degree of electronic expansion valve

Abstract

The invention discloses a control system for adjusting the opening degree of an electronic expansion valve so that an effective implementation plan of controlling the opening degree of an electronic expansion valve can be searched. The control system comprises an input terminal IN, a first multiplier, an electronic expansion valve, and a feedback module, a Smith fuzzy PID controller for generatingcontrol information for controlling the opening of the electronic expansion valve, an evaporator, and an output terminal OUT. The input terminal IN, the first multiplier, the Smith fuzzy PID controller, the electronic expansion value, the evaporator, and output terminal OUT are connected in sequence. According to the invention, a fuzzy controller applied to a fuzzy control algorithm to set control information of the PID controller in real time and a Smith predictor compensator for reducing the control lag of the electronic expansion valve are fused based on the PID controller. Therefore, thecontrol system has advantages of strong fuzzy control adaptability, insensitivity to model accuracy, and strong robustness and the like.

Description

technical field [0001] The invention relates to the field of air-conditioning heat pumps, in particular, the invention relates to a control system for adjusting the opening degree of an electronic expansion valve of an air-conditioning heat pump system. Background technique [0002] Electronic expansion valves are applied to automotive air-conditioning heat pump systems, which can better meet the needs of rapid changes in refrigerant flow. In the heat pump air conditioning system, the medium-temperature and high-pressure liquid refrigerant coming out of the condenser is expanded and throttled by the electronic expansion valve, and then becomes a low-pressure gas-liquid two-phase mixed refrigerant, and then enters the evaporator to absorb heat and evaporate into a gaseous state. into the compressor to complete a cycle. In addition to throttling and decompression, the role of the electronic expansion valve is to assist the compressor in regulating the flow rate to ensure an a...

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Problems solved by technology

At the same time, the temperature control of the heat pump air-conditioning system has large time-lag and large inertia characteristics, so that the controlled parameters cannot timely affect the adjustment effect and the state of the reaction system, resulting in increased overshoot, long response time and poor stability during the adjustment process. And other issues

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