Method for adjusting electronic expansion valve of outdoor air conditioner

Abstract

The invention discloses a method for adjusting an electronic expansion valve of an outdoor air conditioner. The method comprises the following steps: acquiring a real-time running frequency, a real-time exhaust temperature and a real-time outdoor ambient temperature of a compressor, and comparing the real-time running frequency with a first set frequency; if the real-time running frequency is not lower than the first set frequency, acquiring integral coefficients of a PID algorithm according to a first set rule; if the real-time running frequency is lower than the first set frequency, acquiring the integral coefficients of the PID algorithm according to the relationship between the real-time outdoor ambient temperature and a first set outdoor ambient temperature and a second set rule, or acquiring the integral coefficients of the PID algorithm according to the relationship between the real-time outdoor ambient temperature and the first set outdoor ambient temperature and a third set rule, wherein whether to adopt the second set rule or the third set rule depends on different working conditions of refrigeration or heating; and conducting PID control on the opening degree of the electronic expansion valve according to the deviation, namely the difference value between the real-time exhaust temperature and a set target exhaust temperature. According to the method, the opening degree of the electronic expansion valve can be adjusted accurately and stably.

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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