Premium
FDI Design for Uncertain Nonlinear Systems with Both Actuator and Sensor Faults
Author(s) -
Yang Junqi,
Zhu Fanglai
Publication year - 2015
Publication title -
asian journal of control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.769
H-Index - 53
eISSN - 1934-6093
pISSN - 1561-8625
DOI - 10.1002/asjc.867
Subject(s) - control theory (sociology) , actuator , fault detection and isolation , observer (physics) , nonlinear system , lipschitz continuity , control engineering , engineering , fault (geology) , computer science , mathematics , artificial intelligence , control (management) , mathematical analysis , physics , quantum mechanics , seismology , geology
This paper considers the problems of simultaneous actuator and sensor fault detection and isolation ( FDI ) for a class of uncertain Lipschitz nonlinear systems when the observer matching condition is not satisfied. An augmented vector is proposed to construct an augmented system that contains a fault vector consisting of both the actuator and sensor faults of the original system. An auxiliary output vector is constructed to satisfy the observer matching condition, and a high‐gain sliding mode observer is designed to approximately estimate the auxiliary output vector. An adaptive robust sliding mode observer is developed as a fault detector to detect the actuator and sensor faults simultaneously. Then, multi‐observers are designed to attain the actuator and sensor fault isolation purpose. Finally, a numerical simulation is given to show the effectiveness of the proposed methods.