Adaptive Variable Structure Control Design Without a Priori Knowledge of Control Directions

In this paper, a new adaptive variable structure control (VSC) scheme is proposed for nonlinear systems without a prior knowledge of control directions. By incorporating a Nussbaum-type function, the new adaptive VSC law can ensure the asymptotic convergence of the tracking error in the existence of non-parametric uncertainties. Simulation results are shown to validate the effectiveness of the proposed control scheme.

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