Sliding Surface Slope Adjustment in Fuzzy Sliding Mode Controllers

Combining fuzzy logic controller and sliding mode controller to exploit the superior sides of these two controllers is an active area in control theory. The dynamic behaviour of the hybrid system named as fuzzy sliding mode controller depends quite heavily on the sliding surface on which the control structure is switched. In this study, the slope of the sliding surface is continuously updated by a new time-varying coefficient. The effectiveness of the proposed method over the classical fuzzy sliding mode control is illustrated by simulations performed on a second order system with uncertain parameters.