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This paper proposes a second-order sliding mode observer for fault diagnosis (FD) of a class of uncertain dynamical systems. In the proposed FD scheme, a modified super-twisting second-order sliding mode algorithm is firstly established to observe the system state in the presence of uncertainties and disturbances, and then the observer input is designed by using a PID-type iterative learning algorithm...
In this paper, we develop a robust high gain observer for state and unknown input estimations for a special class of single-output nonlinear systems. The unknown input is characterized by a scalar disturbance that is distributed by a known nonlinear vector. Ensuring the observability of the disturbance with respect to the output, the disturbance can be estimated from the sliding surface. Under a Lipschitz...
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