Drive control device and 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;
• applying a first holding current of a first predetermined duration time to a motor to produce a torque that achieves positioning a relative position between stator and rotor magnetic fields of the motor when the desired valve body opening pulse number is different from a current valve body opening pulse number;
• applying a first additional pulse signal of a first predetermined pulse number to the motor of the electronic expansion valve after performing a power amplification thereon, and then applying a second holding current of a second predetermined duration time to the motor to produce a torque that achieves positioning a relative position between stator and rotor magnetic fields of the motor;
• and
• determining a rotary pulse number that the motor to be rotated according to the desired valve body opening pulse number and the 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.