Control method and device of electronic expansion valve

Abstract

The invention discloses a control method and device of an electronic expansion valve. The control method comprises the steps that the maximum value and the minimum value, corresponding to the maximumvalue and the minimum value of the operation frequency of a compressor, of the opening degree of the electronic expansion valve are confirmed; the indoor real-time temperature is acquired, and the real-time operation frequency of the compressor is controlled; the change tendency of the real-time operation frequency of the compressor is calculated; if the real-time operation frequency of the compressor becomes larger, the opening degree of the electronic expansion valve within unit time becomes larger within a fixed time quantum in future, and the variable quantity of the opening degree of theelectronic expansion valve within unit time is increased gradually; and if the real-time operation frequency of the compressor becomes smaller, the opening degree of the electronic expansion valve within unit time becomes smaller within a fixed time quantum in future, and the variable quantity of the opening degree of the electronic expansion valve within unit time is increased gradually. The indoor temperature change speed is effectively increased, meanwhile, it can be effectively guaranteed that temperature changes are gentle, the indoor temperature is prevented from severely changing, and discomfort of indoor users is avoided.

Description

technical field [0001] The invention relates to the technical field of intelligent control, and more specifically relates to a control method and device for an electronic expansion valve. Background technique [0002] The electronic expansion valve is a throttling element that can enter the refrigerant flow of the refrigeration device according to the preset program. The electronic expansion valve is mainly used in the air conditioning equipment to adjust the refrigerant flow by signal control and pass the medium temperature and high pressure liquid refrigerant through it. Throttling becomes low temperature and low pressure wet steam. In some occasions where the load changes drastically or the operating range is wide, traditional throttling elements (such as capillary tubes, thermal expansion valves, etc.) can no longer meet the requirements of comfort and energy saving. Electronic expansion valves combined with compressor variable capacity technology have been obtained. mo...

AI Technical Summary

Problems solved by technology

In some occasions where the load changes drastically or the operating range is wide, traditional throttling elements (such as capillary tubes, thermal expansion valves, etc.) can no longer meet the requirements of comfort and energy saving. Electronic expansion valves combined with compressor variable capacity technology have been obtained. more and more widely used

[0003] In the prior art, the control system of air-conditioning equipment has a fairly mature technology for adjusting the opening of the electronic expansion valve. The opening adjustment of the common electronic expansion valve is generally based on the operating power of the compressor and the temperature parameters of the refrigerant, but the specific The control algorithm is not good enough, which can easily affect the user experience

Images