Efficient and energy-saving control algorithm for variable frequency air conditioner

The invention discloses an efficient and energy-saving control algorithm for a variable frequency air conditioner. The efficient and energy-saving control algorithm comprises the following steps: detecting a difference value between a target condensation temperature and a current condensation temperature and a difference value between a target evaporation temperature and a current evaporation temperature; determining control logics of an electronic expansion valve and a compressor, an indoor draught fan and a draught fan of an outdoor unit; and controlling the operation of the air conditioner by taking the highest energy efficiency ratio as a target and taking the maximum energy efficiency ratio in unit time as a control target so as to realize the energy-saving aim, weaken the comfort level of a user and increase the energy efficiency ratio of the air conditioner.