Control method of electronic expansion valve of air conditioner

Abstract

The invention discloses a control method of an electronic expansion valve of an air conditioner. The maximum opening of the electronic expansion valve is 480 pulses. The control method comprises the steps that after a starting instruction is received, a control system of the air conditioner opens the electronic expansion valve to the maximum opening or to more than 70% of the maximum opening, and then a compressor is started; after the compressor is started and operates for a period of time till operating stably, the opening of the electronic expansion valve is adjusted to the target operating opening; an air conditioner system operates normally; when a shutting-down instruction is received, the control system of the air conditioner opens the electronic expansion valve completely. According to the technical scheme, due to the fact that the electronic expansion valve is completely opened in the starting process, the coolant pressure difference between the two ends of a system throttling device can be reduced, the starting resistance of the compressor can be reduced, and the starting current can be reduced. The service life of system elements can be prolonged. A small-capacitance capacitor can be used, and therefore the system cost can be lowered, and impact on a power grid and other household appliances can be reduced.

Description

technical field [0001] The invention belongs to the technical field of air conditioners, in particular, the invention relates to a method for controlling an electronic expansion valve of an air conditioner. Especially suitable for air conditioning technology with fixed frequency compressors. Background technique [0002] In the prior art, when the fixed-frequency air conditioner is turned on, it needs to generate a relatively large torque to drive the compressor through the capacitor of the compressor. [0003] When the compressor of the fixed-frequency air-conditioning system is started, it needs to provide a large current value after the capacitor is stored to generate a large torque to drive the compressor rotor to overcome the starting torque (or called the starting system resistance). Electrical appliances have a greater impact, and it will also shorten the service life of capacitors and increase the probability of air conditioner maintenance. Contents of the inventi...

AI Technical Summary

Problems solved by technology

[0003] When the compressor of the fixed-frequency air-conditioning system is started, it needs to provide a large current value after the capacitor is stored to generate a large torque to drive the compressor rotor to overcome the starting torque (or called the starting system resistance). Electrical appliances have a greater impact, and at the same time shorten the service life of capacitors and increase the probability of air conditioner maintenance

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