Application of a Fault-Tolerant Control strategy to a nonlinear plant using a robust fault diagnosis approach



A fault-tolerant control strategy based on a robust model-based fault diagnosis approach is addressed. The approach considers the application of a robust control technique to integrate the control design and the fault diagnosis in the same framework. A model-based approach is used to estimate the nonlinear system's outputs and to synthesise the robust controller. The design objectives and the system's uncertainties are formulated in terms of H∞ specifications and the problem is solved using the structured singular value (mu). The main purpose is to obtain a robust fault-tolerant controller and a fault diagnosis system in a supervisory control framework. Residual signals are considered for fault diagnosis and fault accommodation purposes. This approach was applied to a nonlinear system: the Three-Tank benchmark plant.


fault-tolerant systems, fault diagnosis, fault accommodation, robust control, structured singular value, uncertainty, control system synthesis, order reduction


Fault-Tolerance in Control Systems


7th Portuguese Conference on Automatic Control - CONTROLO 2006, September 2006

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