Control method and circuit for electronic expansion valve of air conditioner

Abstract

The invention is applicable to the field of air conditioner controlling and provides a control method and circuit for an electronic expansion valve of an air conditioner. The method includes: acquiring target exhaust temperature according to operation frequency of a compressor, detecting actual exhaust temperature of the compressor, and determining a corrected value of superheat degree of return gas according to the target exhaust temperature and the actual exhaust temperature; determining a target initial value of the superheat degree of the return gas; calculating a current deviation of the superheat degree of the return gas according to current superheat degree of the return gas and the corrected value of the superheat degree of the return gas, and determining correction and adjusting time of the electronic valve according to a deviation of the superheat degree of the return gas, obtained by previous calculation; adjusting opening of the electronic expansion valve according to the correction of the electronic expansion valve, and keeping the opening of the electronic expansion valve unchanged in an adjusting period of time. On the basis of superheat degree control, by integrating the double factors, namely the superheat degree of the return gas of the compressor and the exhaust temperature of the compressor, an optimal control scheme is provided; energy saving is achieved.

Description

technical field [0001] The invention belongs to the technical field of air conditioner control, in particular to an air conditioner electronic expansion valve control method and a control circuit. Background technique [0002] The operating frequency of the compressor of the inverter air-conditioning system can be automatically adjusted according to the change of the room temperature, so as to achieve the minimum temperature fluctuation, the best comfort and the best energy saving effect. When the operating frequency of the compressor is adjusted, the refrigerant flow rate of the circulation loop of the air conditioning system will also change. At this time, it is necessary to adjust the opening of the electronic expansion valve synchronously to achieve the best energy efficiency control. [0003] At present, the most commonly used control methods for electronic expansion valves in air-conditioning systems include compressor return air superheat control method and compressor...

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Problems solved by technology

[0005] In view of the above problems, the purpose of the present invention is to provide a control method and a control circuit for an electronic expansion valve of an air conditioner, aiming to solve the problem that the existing electronic expansion valve control method has a certain control blind spot, which cannot achieve good energy saving under all conditions. Technical issues with effects

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