Optimization of PID parameters of powder hydraulic electrohydraulic  servo system based on fuzzy DE algorithm
                                                                                         DAI Benyao
（Branch of Automobile and Mechanical Engineering，Zhejiang Industry and Trade Vocational College， Wenzhou 325000，China）

Abstract: Aiming at the problem that the timevarying, nonlinear and easily disturbed characteristics of electrohydraulic servo system of powder hydraulic system, it is difficult to achieve ideal results by using conventional PID control, based on the analysis of the electrohydraulic servo system, the mathematical model of the system was established, and a differential evolution algorithm based on the fuzzy reasoning technology was proposed, which was used to optimize the PID parameters of the electrohydraulic servo control system and improve the regulation control of the PID controller to the electrohydraulic servo system. Under the input of unit step signal, FDEPID control and conventional PID and DEPID control effects of CNC powder hydraulic electrohydraulic servo system were simulated and analyzed by Matlab respectively. The results show that the FDEPID controller performs better in control accuracy, antijamming ability and robustness than other control functions.

Key words: electrohydraulic servo control system; powder metallurgy hydraulic press; differential evolution(DE); fuzzy reasoning technology; PID control