Abstract
ABSTRACTAn output-feedback sliding-mode-based extremum-seeking controller was recently introduced for linear uncertain systems by using periodic switching functions. Nonlinear systems were also considered but restricted to relative degree one plants as well as the former linear case. Here, generalisation is achieved to include more general dynamics with arbitrary relative degree, thanks to the introduction of a high-gain adaptive observer with updated gain. Global stability properties of the closed-loop system with convergence to a controlled neighbourhood of the desired maximum point are also rigorously proved. Simulation and experimental results illustrate the performance of the proposed extremum-seeking control algorithm.
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