Method of adjusting electronic expansion valve of air conditioner

Abstract

The invention discloses a method of adjusting an electronic expansion valve of an air conditioner. The method comprises the following steps: operating a compressor to acquire a real-time operational frequency, a real-time exhaust temperature and a real-time outdoor environmental temperature of the compressor; acquiring a target exhaust temperature corresponding to the real-time operational frequency according to a known corresponding relationship between the target exhaust temperature and the operating frequency of the compressor as a first target exhaust temperature; taking the sum of the first target exhaust temperature and a set compensation temperature as a second target exhaust temperature, wherein the set compensation temperature is determined according to the real-time outdoor environmental temperature; and by taking a difference value of the real-time exhaust temperature and the second target exhaust temperature as a deviation, performing PID control on the open degree of the electronic expansion valve based on the deviation. By adopting the method disclosed by the invention, precise and stable adjustment on the open degree of the electronic expansion valve is realized.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, specifically relates to the regulation of an air conditioner, and more specifically relates to a method for controlling an electronic expansion valve of the air conditioner. Background technique [0002] As a new type of control element, the electronic expansion valve is widely used in the air-conditioning refrigerant circulation system. By adjusting the opening of the electronic expansion valve, the refrigerant circulation volume in the system can be adjusted to meet the performance requirements of the air conditioner. Therefore, how to effectively control the electronic expansion valve is the key to measure the energy efficiency ratio of the air conditioning system. [0003] In the prior art, a PID algorithm may be used to control the opening of the electronic expansion valve. Specifically, the difference between the actual exhaust temperature of the compressor and the target exhaust...

AI Technical Summary

Problems solved by technology

[0004] In the existing PID valve control, the target discharge temperature is only determined according to the operating frequency of the compressor. When the outdoor ambient temperature changes, the target discharge temperature is not accurate enough, resulting in inaccurate adjustment of the opening of the electronic expansion valve, which affects the energy efficiency ratio of the system. promote

On the other hand, the PID parameter value in the PID valve control is fixed, so that the adjustment of the valve opening cannot adapt to the changes of different types of air conditioners and different operating conditions, and the adjustment of the valve opening is not accurate enough to achieve the ideal air conditioning refrigerant. Energy Efficiency Ratio of Circulation System

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