|UIO-based Fault Estimation and Accommodation for Nonlinear Switched Systems
Haoshuang Chen, Dongsheng Du*, Dewen Zhu, and Yan Yang
International Journal of Control, Automation, and Systems, vol. 17, no. 2, pp.435-444, 2019
Abstract : "This paper investigates the problems of fault estimation and fault accommodation for a class of nonlinear
switched systems. First, an augmented switched system is constructed by forming an augmented state vector
composed of the state vector and the fault vectors. Then, an unknown input observer (UIO) is designed for the
augmented switched system to estimate the augmented state vector. With the assist of the average dwell-time
(ADT) method and the switched Lyapunov function technique, sufficient conditions are obtained to guarantee that
the error system is globally uniformly asymptotically stable (GUAS) with a prescribed H∞ performance index. An
algorithm is provided to show the procedures on how to design the UIO. Moreover, the results are extended to the
measurement disturbances case. Based on signal compensation principle, a dynamic output feedback controller is
designed to ensure the asymptotical stability of the closed-loop system. Finally, simulation results are presented to
demonstrate the proposed technique."
Dynamic output feedback controller, fault estimation, nonlinear switched systems, UIO.