Disturbance control method for outer ring electronic expansion valve of air conditioning system and air conditioner

By using the forced disturbance control method of the outer loop electronic expansion valve, the problem of lubricating oil and refrigerant blockage during defrosting or oil return in multi-split air conditioning systems is solved, achieving stable system operation and efficient defrosting, preventing compressor overheating, and improving user experience.

CN122281501APending Publication Date: 2026-06-26NINGBO AUX ELECTRIC CO LTD
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Patent Information

Application Number
CN202610664514.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-14
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

During the defrosting or oil return process of a multi-split air conditioning system, the outdoor unit's heating electronic expansion valve is prone to blockage of lubricating oil and refrigerant, causing the compressor to operate with liquid or suffer from oil shortage and wear, and the exhaust temperature to be too high, affecting the defrosting effect and system stability.

Method used

The forced disturbance control method using the outer loop electronic expansion valve includes acquiring the air conditioning system status parameters, determining whether a disturbance program is triggered, setting the disturbance period, reference opening degree, and duty cycle, alternating between forced valve closing and opening disturbances, and dynamically correcting the disturbance program in conjunction with the exhaust temperature, compressor return gas superheat, and oil separator return oil temperature to ensure effective execution of the disturbance program in defrosting or oil return modes.

Benefits of technology

It effectively eliminates oil blockage and refrigerant blockage, prevents the compressor from running with liquid or experiencing wear due to lack of oil, reduces exhaust temperature, improves defrosting and oil return efficiency, and ensures stable operation of the air conditioning system and user experience under multiple operating conditions.

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Abstract

The invention relates to the technical field of multi-split air conditioning systems, in particular to a disturbance control method for an outer ring electronic expansion valve of an air conditioning system, and solves the problems of how to actively eliminate oil blockage and refrigerant blockage and reduce exhaust temperature through forced disturbance control of an outer heating electronic expansion valve in the defrosting or oil return process. In order to solve the problem, the control method comprises the steps that operation state parameters of the air conditioning system are obtained, and whether the air conditioning system triggers a disturbance program or not is judged according to the state parameters; in the execution process of the disturbance mode, the reference setting is corrected according to the exhaust temperature, the compressor return air superheat degree and the oil separator return oil temperature; in the defrosting mode and the oil return mode, whether the disturbance program is quitted or not is judged according to the exhaust temperature and the execution duration of the disturbance program; and when the air conditioning system quits the defrosting mode or the oil return mode, the disturbance program automatically quits.
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