Lie bracket approximation-based extremum seeking with vanishing input oscillations

Abstract

In recent years, an approach to extremum seeking control made it possible to design control vector fields that lead to asymptotic stability of the minimum point provided that the minimum value of the function is known a priori. In this work we aim to relax that assumption. We propose an extremum seeking control law that converges to the minimum point with vanishing control oscillations, without access to the minimum value of the cost function. We provide a numerical example to support our results.