Stabilization of chaotic systems via fuzzy time-delayed controller approac

In this paper, we investigate the stabilization of unstable periodic orbits of continuous time chaotic systems using fuzzy time-delayed controllers. For this aim, we present a control method that can achieve stabilization of an unstable periodic orbit (UPO) without any knowledge of the system model. Our proposal is attained progressively. First, we combine the input-to-state linearizing controller with the fuzzy method to obtain one that achieves UPO stabilization. Then, we use reduced order sliding observer to estimate the necessary state for the controller construction. Finally, the eciency of the proposed methods is demonstrated using numerical simulations applied to Chua's system.