Jing He,∗ Changfan Zhang,∗ Houguang Chu∗∗∗
Fault reconstruction, sliding mode variable structure, observers
This paper presents the design of a sliding mode variable structure observer, which is used for the fault detection and isolation of sensors and actuators in uncertain nonlinear systems. Firstly, the coordinate of a system output equation is transformed, and a sensor fault is equivalent to an actuator one by using a low-pass filter. Then using a coordinate transformation to transform the equivalent equation into three sub-systems, and the uncertainties only exist in the second one, while the first contains actuator faults and the third has equivalent actuator faults. The design of three observers, respectively, corresponding to the above sub-systems, the actuator faults, sensor faults as well as the unknown input disturbances are reconstructed separately as a result. Two simulation examples confirm the truth of effectiveness of the reconstruction plan.
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