A New Fuzzy PID Controller for Time Delay Systems

This paper presents a practical method to design and implement a fuzzy PID controller for time delay systems.A new fuzzy PID control strategy is proposed to improve the control performances. The proposed strategy utilizes an innovative idea based on sectionalizing the error signal of the step response into three different functional zones. The supporting philosophy behind these three functional zones is to decompose the desired control objectives in terms of rising time, settling time and steady state error measures maintained by an appropriate PID type controller in each zone. Then, fuzzy membership factors are defined to configure the control signal on the basis of the fuzzy weighted PID outputs of all three zones. The obtained results illustrate the effectiveness of the proposed fuzzy PID control scheme in improving the performances of the implemented control systems for time delay.