Output tracking controller design for MIMO nonlinear systems with higher-order and unmatched uncertainties

Based on the combination of the sliding mode control with fuzzy control and simple adaptation laws, the paper presents a new and feasible design algorithm to synthesize a robust fuzzy sliding mode controller which can easily tackle the output tracking control problem of MIMO nonlinear systems in the presence of higher-order and unmatched uncertainties without the knowledge of the upper bounds on the norm of the uncertainties. A series of computer simulations are included to verify the effectiveness of the proposed design algorithm.