Abstract: This paper proposes a new approach to intelligent Fuzzy-PID dual module control for improving dynamic performance of an NC servo feed system. This new controller uses auto-adaptive full domain control by self-adjusting factors with fuzzy regulation and fuzzy scaling. Simulations suggest that this method can achieve online automatic adjustment of the control parameters and algorithms according to the requirements for dynamic performance at different response phases under various working conditions. The unfavorable disturbance, large overshoot and long adjustment time in the old control algorithm can be effectively avoided. A Matlab simulation demonstrates that compared with a general PID fuzzy controller, the proposed controller can offer a rapid response, small overshoot, strong robustness and self-optimization.

Key words: servo feed, autoadaptive control, fuzzy control, PID control, dual module control