Sliding Mode Control with Predictive PID Sliding Surface for Improved Performance

Abstract

In this paper, a sliding mode control system with a predic-tive proportional-integral-derivative (PPID-SMC) sliding surface is proposed. A robust sliding mode controller is suggested to track the desired trajectory despite uncertainty, set point variations , and external disturbances. The proposed sliding mode controller is chosen to ensure the stability of overall dynamics during the reaching phase and sliding phase. The chattering problem is overcome using a hyperbolic tangent function for the sliding surface. Simulation example is given to illustrate the use of the proposed structure for better performance in terms of time domain specifications over some existing design methods.