Fuzzy Self-adaptive PI-Smith Control for Long Time-delay System

The long time-delay is often existent in industrial processes.A Fuzzy-PI-Smith controller for a system with the long time-delay was proposed to solve the problem of big overshoot and regulating time during the long time-delay control.Combines the Smith predictive control with fuzzy self-adaptive PI in this paper.The traditional PID controller in Smith predictive control was replaced by fuzzy PI controller which utilizes the principle of fuzzy control to tune parameters of PI controller on-line.The results of simulation for electric oven shows,that the method have the advantages of short regulating time,no overshoot,excellent control accuracy,no stabilizing error and good adaptive ability to the changes of system model.