An Asynchronized Observer Based Fault Detection Approach for Uncertain Switching Systems With Mode Estimation
Linlin Li, Steven X. Ding, Yuhong Na, Jianbin Qiu
Abstract
This brief addresses the design issues of real-time asynchronized observer based fault detection in uncertain switched systems combining with a mode estimation unit. To this end, the so-called <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mathcal {L}_{\infty }/\mathcal {L}_{2}$ </tex-math></inline-formula> type of residual generators is investigated in the asynchronized switching manner with the aid of average dwell time approach for the first time. A mode estimation unit is developed based on the measurements collected from the residual generators and the process, and further embedded in a multi-level detection logic. As a result, the conservative threshold setting caused by the model mismatch in the asynchronized residual generation, and the fault detectability can be improved.