The robust previous step adaptive fuzzy controller for nonlinear systems

The robust previous step adaptive fuzzy controller for nonlinear systems is proposed in this paper. First, the robust previous step control system is proposed, which can achieve a certain goal without concern for instability of the controlled system in the presence of significant plant uncertainties if the nominal parameter is roughly estimated. Secondly, the adaptive fuzzy controller is proposed to adaptively adjust the nominal parameter for improving the robust previous step control performance. Finally, simulation results demonstrate that the proposed control schemes have the excellent capability of for improving the output performance.