Method for controlling electronic expansion valve of variable-frequency air conditioner

The invention discloses a method for controlling an electronic expansion valve of an air conditioner, which comprises initial aperture control and refrigerant target exhaust temperature control. When the air conditioner starts to operate, the electronic expansion valve is in an aperture after initialization, thereby being beneficial to the flow of a refrigerant, effectively reducing the exhaust pressure of the refrigerant, realizing the movement from the aperture after initialization to a target aperture value, shortening the stroke from the minimum aperture to the target aperture value, and effectively shortening the operating time. After the air conditioner operates, the aperture of the electronic expansion valve can be adjusted according to the outdoor air temperature which is measuredby a machine, the exhaust temperature of the refrigerant and the operating efficiency of a compressor, thus the aperture of the electronic expansion valve is controlled to be the optimum aperture value, the exhaust temperature of the refrigerant is effectively reduced, and the exhaust pressure of the refrigerant and the load of the air conditioner are reduced.