Observer‐based active fault‐tolerant control for a class of pure‐feedback switched nonlinear systems

摘要

Summary An active fault‐tolerant control (FTC) strategy for a class of switched nonlinear systems in pure‐feedback form by using average dwell time method is investigated in this article. The unknown functions in the system are approximated directly by fuzzy logic systems. A fuzzy state observer is designed to estimate the unavailable states, based on which, a fault detection project is designed. In fault‐free case, all the signals in the closed‐loop system are proved to be bounded under the control of the designed input. The fault estimation and FTC projects will be activated after a fault has been detected. In addition, the active FTC is constructed in the framework of backstepping design technique. The proposed controller guarantee that all the closed‐loop signals remain bounded under a class of switching signals with average dwell time. The simulation results show the effectiveness of the proposed method.