Method and device for controlling electronic expansion valve

Abstract

The invention discloses a method and device for controlling an electronic expansion valve. The method for controlling the electronic expansion valve includes the steps of a, periodically obtaining the current outdoor environment temperature and the current frequency of a compressor, obtaining a first adjusting range of the electronic expansion valve according to the adjustment range, corresponding to the preset outdoor environment temperature, of the electronic expansion valve, obtaining a second adjusting range of the electronic expansion valve according to the adjustment range, corresponding to the preset frequency of the compressor, of the electronic expansion valve, b, obtaining the intersection of the first adjusting range of the electronic expansion valve and the second adjusting range of the electronic expansion valve, taking the intersection as a final adjusting range of the electronic expansion valve, c, obtaining the variation trend of exhaust gas temperature, and correspondingly adjusting the electronic expansion valve within the final adjusting range of the electronic expansion valve according to the variation trend of exhaust gas temperature. According to the method and device for controlling the electronic expansion valve, the electronic expansion valve is adjusted fast and reasonably under the control of the outdoor environment temperature factor adjusting range and the compressor frequency factor adjusting range and on the basis that the electronic expansion valve is controlled by the exhaust gas temperature.

Description

technical field [0001] The invention relates to the field of electronic expansion valves, in particular to a control method and device for the electronic expansion valve. Background technique [0002] At present, the electronic expansion valve control method in the air conditioner is relatively simple, and superheat control or exhaust temperature control is generally used. Superheat temperature control refers to adjusting the opening degree of the electronic expansion valve through the difference between the return air temperature and the outlet temperature of the evaporator, that is, the opening degree of the electronic expansion valve, so that the temperature difference can be maintained within a reasonable range. If the difference is greater than the set temperature difference, it means that the superheat is too large, and the valve needs to be opened according to the set procedure, that is, the opening of the electronic expansion valve should be increased; otherwise, the...

AI Technical Summary

Problems solved by technology

That is, when the ambient temperature or the operating frequency of the compressor changes sharply, the electronic expansion valve has the risk of overshooting, which affects the efficiency of the air conditioner and reduces the service life of the electronic expansion valve.

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