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The problem of observation of some classes of quasilinear uncertain systems is studied in the framework of unknown input observer theory. High-order sliding-mode observers are designed for the considered classes of systems. Necessary conditions for the convergence of the proposed observers are given in terms of restrictions on the system matrices. A new observation scheme, based on the error injection...
This paper presents an approach to the finite time detection and isolation of actuator faults in a class of nonlinear uncertain systems. After a suitable preliminary state transformation, devoted to put the system dynamics in an appropriate normal form, a reduced-order observer is designed which has an output injection term based on a second-order sliding mode control algorithm featuring global convergence...
This paper presents an approach to the simultaneous faults detection, isolation and reconstruction in the hydraulic vertical three-tank system. An observer is designed which contains a corrective term based on a second-order sliding mode control algorithm featuring global convergence properties. Thanks to the proposed global observer, the reconstruction of certain faults and/or disturbances can be...
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