Fuzzy PID control for direct drive electro-hydraulic position servo system

In considering the saturation and dead zone nonlinearity as well as the time-variability and the time lag existed in direct drive volume control system, the traditional PID controller has the problems of parameter tuning difficulty and poor adaptability. This paper sets up a fuzzy PID control algorithm by pulling in fuzzy control theory, which realizes self-tuning PID parameters and effectively weaken the system saturation, dead zone, the time delay and other disadvantages, the accuracy and stability of hydraulic position servo system are improved. The unit step, square wave and cosine input signals are simulated with PID control and fuzzy PID control. The results show that: compared with the traditional PID control, fuzzy PID control that uses the strategy of adaptive PID control parameters, which effectively reduced the impact of dead zone serious nonlinear and time delay. Response speed, control accuracy and robust capability of the system have been greatly improved.