Drive control method for electronic expansion valve

A drive control method for an electronic expansion valve, comprising the steps of:

• receiving a desired valve body opening signal of the electronic expansion valve, and determining a desired valve body opening pulse number according to the desired valve body opening signal;
• determining a rotary pulse number that rotates a motor of the electronic expansion valve according to the desired valve body opening pulse number and a current valve body opening pulse number, producing a drive pulse signal corresponding to the rotary pulse number based on the rotary pulse number, and applying the drive pulse signal to the motor of the electronic expansion valve after performing a power amplification thereon;
• applying a third holding current of a third predetermined duration time to the motor after performing a power amplification thereon to produce a torque that achieves positioning a relative position between stator and rotor magnetic fields of the motor;
• and
• applying an additional pulse signal of a second predetermined pulse number to the motor of the electronic expansion valve after performing a power amplification thereon, and then applying a fourth holding current of a fourth predetermined duration time to the motor after performing a power amplification thereon to produce a torque that achieves positioning a relative position between stator and rotor magnetic fields of the motor.