A method of controlling an expansion valve opening degree

By controlling the expansion valve opening using a correction mode and adjusting the expansion valve opening using a prediction function and correction coefficient, the problem of suction superheat deviation in air conditioners after compressor frequency changes is solved, achieving rapid and stable temperature regulation and compressor protection.

CN122191760APending Publication Date: 2026-06-12NINGBO AUX ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-24
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

Existing air conditioners experience a transitional phase where the suction superheat deviates from the target value after the compressor frequency changes, affecting temperature regulation capabilities and posing a risk of compressor damage.

Method used

The expansion valve opening is controlled by a correction mode. The expansion valve opening is adjusted by using a prediction function and a correction coefficient to shorten the transition phase and reduce the deviation of the intake superheat. This includes determining the prediction function and the calculation method of the correction coefficient for the change in expansion valve opening.

Benefits of technology

This improves the air conditioner's temperature regulation capability during transition periods, shortens the time affected by temperature regulation, and reduces the risk of damage to the compressor.

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    Figure CN122191760A_ABST
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Abstract

The application provides a control method for an expansion valve opening degree, and relates to the technical field of air conditioners. The method comprises a correction mode: determining a prediction function of an opening degree variation of an expansion valve about an environmental variable and a frequency variation of a compressor in a stable operation state of an air conditioner; obtaining a correction coefficient, a time length and a maximum absolute difference between an exhaust temperature in a transition stage and an exhaust temperature in a subsequent stable stage in a current period; determining a correction coefficient of a subsequent transition stage according to the correction coefficient, the maximum absolute difference and the time length in the transition stage in the current period; and determining an opening degree of the expansion valve in the transition stage of the subsequent period according to the determined correction coefficient of the transition stage of the subsequent period, the frequency variation of the compressor in the subsequent period and the prediction function. The method can reduce the deviation degree of suction superheat in the transition stage after the frequency variation of the compressor of the air conditioner, thereby improving the temperature regulation capacity of the air conditioner on the indoor environment and reducing the damage risk of the compressor.
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