Control method for electronic expansion valve of heat pump dryer

The invention discloses a control method for an electronic expansion valve of a heat pump dryer. The control method comprises the following steps that S1, a control mode is determined; s2, whether a compressor is started or not is determined; if the compressor is started, the initial opening degree is maintained, waiting is carried out for 60 seconds, and S3 is carried out; if the compressor is not started, the initial opening degree is maintained, and the compressor is started again; s3, the exhaust temperature is collected, and the target exhaust temperature is obtained; s4, performing PID calculation to obtain an execution action step; s5, the electronic expansion valve executes the corresponding step number; s6, whether the compressor is started or not is determined; if so, waiting for a PID regulation period; if not, entering S2; s7, determining the minimum opening degree of the electronic expansion valve, wherein the minimum opening degree is determined by the minimum opening degree of the parameter mai