Fine adjustment control method and system of electronic expansion valve

Abstract

The invention provides a fine adjustment control method of an electronic expansion valve. The fine adjustment control method is suitable for the field of intelligent air conditioning equipment and comprises the following steps of opening the electronic expansion valve according to a preset opening; performing real-time adjustment on the opening of the electronic expansion valve according to system running parameters; recording the number of fluctuations if the real-time adjustment fluctuates between opening increase and opening reduction; reducing the adjustment range of the real-time adjustment until the recorded number of the fluctuations is smaller than the preset number if the number of the fluctuations is larger or equal to the preset number; continuing to perform the real-time adjustment on the opening of the electronic expansion valve according to the system running parameters if the number of the fluctuations is smaller than the preset number. According to the fine adjustment control method of the electronic expansion valve, the opening allowance of the electronic expansion valve is reduced through the real-time adjustment on the opening range of the fluctuations between the opening increase and the opening reduction of the electronic expansion valve and accordingly the number of the fluctuations between the opening increase and the opening reduction of the electronic expansion valve can be smaller than the preset number, a system can be run according to the most suitable opening which is suitable for the current working condition parameters, and the stable running of the air conditioning system is achieved.

Description

technical field [0001] The invention belongs to the field of intelligent air-conditioning equipment, and in particular relates to a fine adjustment control method and system for an electronic expansion valve. Background technique [0002] In the air conditioning system, especially the frequency conversion air conditioning system, the refrigerant flow rate of the system varies widely according to the load during operation, while traditional throttling components such as capillary tubes, thermal expansion valves, etc. cannot guarantee the system due to their narrow adjustment range or inaccuracy. Stable operation, and the electronic expansion valve has become a throttling component commonly used in inverter air conditioning systems due to its large flow adjustment range, mature drive technology, and flexible control. [0003] The current variable frequency air conditioning system mostly uses the compressor discharge temperature or return air superheat to determine the opening ...

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Problems solved by technology

[0006] The purpose of the embodiments of the present invention is to provide a fine-tuning control method for an electronic expansion valve, aiming to solve the problem that the target opening of the electronic expansion valve is not strictly suitable, and fluctuates back and forth between two openings, resulting in unstable operation of the air conditioning system The problem

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