Determination method and device for adjusting amplitude of electronic expansion valve, control method and device and air conditioner

The invention discloses an electronic expansion valve adjusting amplitude determination method and device, a control method and device and an air conditioner. The method for determining the adjusting amplitude of the electronic expansion valve comprises the steps that the difference value between the actual exhaust temperature and the target exhaust temperature of a compressor is determined; the deviation between the actual exhaust temperature and the target exhaust temperature of the compressor is determined according to the difference value, and the target adjusting amplitude of the electronic expansion valve is determined according to the PID algorithm based on the deviation; wherein adjusting parameters of the PID algorithm comprise fixed parameters and variable correction parameters, and the variable correction parameters are determined according to the deviation between the actual exhaust temperature of the compressor and the target exhaust temperature. According to the scheme, the variable correction parameters are introduced into the PID algorithm formula, and the adjustment amplitude of the electronic expansion valve can be corrected online, so that the problems of valve adjustment lag, overshoot, oscillation and the like are solved, and improvement of energy conservation and comfort of a variable-frequency space air conditioner product is facilitated.