Research of fuzzy control in coagulation progress for tap water

Coagulation progress for tap water is a nonlinear, strong coupling and longtime delay system, so it is difficult to control. In this paper designed the cascade fuzzy self-tuning PID controller, makes the control of output water turbidity come true. This method does not need precise mathematical model of the object and has good applicability. Experiment results show that this method has fast response speed, little overshoot and high control precision.