Method for controlling electronic expansion valve of air conditioner

Abstract

The invention discloses a control method for controlling the electronic expansion valve of an air conditioner. The first set frequency is to obtain the integral coefficient of the PID algorithm according to the first set rule, and take the temperature higher than the reference target exhaust temperature obtained according to the first positive correlation between the target exhaust temperature and the operating frequency of the compressor as the first Set the target exhaust temperature; if the real-time operating frequency is greater than the first set frequency, obtain the integral coefficient of the PID algorithm according to the second set rule, and obtain the second set target exhaust temperature according to the first positive correlation; The difference between the gas temperature and the first or second set target exhaust gas temperature is used as a deviation, and the opening degree of the electronic expansion valve is controlled by PID. By adopting the invention, the precise and stable regulation of the opening 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 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 ...

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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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