Method for controlling electronic expansion valve of air conditioner

Abstract

The invention discloses a method for controlling an electronic expansion valve of an air conditioner. The method includes the steps that the real-time operation frequency and the real-time exhaust temperature of a compressor are obtained, and the real-time operation frequency is compared with the first set frequency; if the real-time operation frequency is not larger than the first set frequency, the integral coefficients of the PID algorithm are obtained according to a first set rule, the temperature which is larger than the reference target exhaust temperature obtained according to the first positive correlation between the target exhaust temperature and the compressor operation frequency is used as the first set target exhaust temperature; if the real-time operation frequency is larger than the first set frequency, the integral coefficients of the PID algorithm are obtained according to a second set rule, and the second set target exhaust temperature is obtained according to the first positive correlation; and the difference value between the real-time exhaust temperature and the first or second set target exhaust temperature serves as the deviation for conducting PID control over the opening degree of the electronic expansion valve. By the adoption of the method, the opening degree of the electronic expansion valve is accurately and stably adjusted.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, specifically relates to the control of the air conditioner, and more specifically relates to a method for controlling the 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

Since the slope m in the linear relationship is fixed, the target exhaust temperature obtained according to the linear relationship of the fixed slope is not accurate enough, which may easily cause fluctuations in the exhaust temperature, which in turn leads to inaccurate adjustment of the opening of the electronic expansion valve

[0004] In addition, in the existing PID valve control, the PID parameter value is fixed, so that the adjustment of the valve opening cannot adapt to the change of the working conditions, the adjustment of the valve opening is not accurate enough, and it is difficult to achieve the ideal energy efficiency ratio of the air conditioning refrigerant circulation system

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