Sliding Mode Nonlinear Switching Functions for Control Input Transient Constraints Reduction

This paper introduces a new approach based on the use of nonlinear switching functions in sliding mode control. These nonlinear functions are used to eliminate transient constraints on the control input and therefore to increase the speed performance of the controller without having a negative effect on the control input. This approach is brought up in a general perspective to nth order single input systems. In order to validate the superiority of this novel approach over the conventional sliding mode control, simulation results of a current-controlled magnetic levitation system are compared for both the conventional and the new techniques