Method of adjusting electronic expansion valve of outdoor unit of air conditioner

Abstract

The invention discloses a method of adjusting an electronic expansion valve of an outdoor unit of an air conditioner. The method comprises the following steps: after a compressor is started to operate, acquiring a real-time operational frequency, a real-time exhaust temperature and a real-time outdoor environmental temperature of the compressor; determining a real-time frequency region where the real-time operational frequency is located and a real-time outdoor environmental temperature region where the real-time outdoor environmental temperature is located according to known frequency regions and outdoor environmental temperature regions; acquiring a real-time PID operational parameter value corresponding to the real-time frequency region and the real-time outer environmental temperature region according to a known corresponding relationship between PID operational parameter values and the frequency regions and the outdoor environmental temperature regions; and by taking a difference value of the real-time exhaust temperature and the set 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, in particular relates to the adjustment of the air conditioner, and more specifically relates to a method for adjusting the electronic expansion valve of the outdoor unit 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 a...

AI Technical Summary

Problems solved by technology

However, in the existing PID valve control, the PID parameter value 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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