Integrated 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 an integrated control method and circuit for an electronic expansion valve of an air conditioner. The method includes: calculating a first openness adjustment of the electronic expansion valve according to exhaust temperature; calculating a second opening adjustment and adjusting time of the electronic expansion valve according to superheat degree of return gas of a compressor; selecting one of the first opening adjustment and the second opening adjustment as a final opening adjustment of the electronic expansion valve according to size relationship between the first and second opening adjustments, correspondingly adjusting opening of the electronic expansion valve according to the final opening adjustment, and keeping the opening of the electronic expansion valve unchanged in an adjusting period of time. An effective control scheme is provided by combining a control method for superheat degree of the return gas of the compressor and a control method for target temperature of exhaust of the compressor; the defects of the existing two control methods can be overcome; quick response of the electronic expansion valve is achieved; control with optimal energy efficiency is achieved.

Description

technical field [0001] The invention belongs to the technical field of air conditioner control, and in particular relates to a comprehensive control method and circuit for an electronic expansion valve of an air conditioner. 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 c...

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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 comprehensive control method and circuit for the electronic expansion valve of an air conditioner, aiming to solve the problem that both the existing compressor return air superheat control method and the compressor discharge target temperature control method have certain control problems. Blind spots, technical problems that cannot achieve good energy-saving effects in all states

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