Parameter tuning method of unknown PID controller

A parameter tuning device, configured for tuning parameter of an unknown proportional-integral-derivative (PID) controller which has an unknown manufacturer which provides a control algorithm to support the PID controller, wherein the unknown PID controller correspondingly generates a control signal according to a difference between an output signal outputted by a target system and an input signal in order to control the target system and the target system is controlled by the control signal to correspondingly generate the output signal, the parameter tuning device comprising:

• a central processing unit (CPU);
• and
• a memory, coupled to the CPU, configured to store a plurality of programming codes, wherein the CPU execute the programming codes for receiving a system model of the target system, receiving a performance specification, performing an optimal parameter tuning by a control algorithm of a generic controller to obtain a target parameter of the generic controller according to the system model and the performance specification, setting the unknown PID controller with a first parameter group in order to measure the input signal, the control signal and the output signal, performing a parameter identification procedure on the generic controller to calculate a second parameter group of the generic controller according to the input signal, the control signal and the output signal, and when the second parameter group of the generic controller is not within a specification range of the target parameter of the generic controller, modifying the first parameter group for setting the unknown PID controller again, and then measuring the input signal, the control signal and the output signal again, wherein the specification range is determined by the performance specification.