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Design of unknown input observers and robust fault detection filters. (English) Zbl 0844.93020
A new strategy is proposed to design robust fault detection filters whose residuals have both disturbance decoupling and unidirectional properties. This filter is constructed by combining the unknown input observer principle with the Beard fault detection filter principle. Furthermore, a robust fault isolation scheme using robust directional residual vectors is presented. The given methods are illustrated by the isolated of faulty sensors in a nonlinear jet engine system. The linearization errors are treated as an unknown input term and its distribution is estimated using a least-square procedure. Simulation results are given which show that the faults are correctly isolated.

MSC:
93B07Observability
93B35Sensitivity (robustness) of control systems
93C73Perturbations in control systems
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