Sensor fault tolerant control using a robust LPV based sliding mode observer

Abstract

This paper presents a new sensor fault tolerant control (FTC) scheme inspired by a recently developed LPV based sliding mode observer. The robustly reconstructed sensor faults from the observer are used to ‘correct’ the corrupted measurements before they are used by the existing controller. The modular structure of the sensor FTC scheme allows it to be retrofitted to the existing closed loop system and the observer can be designed independently. The closed-loop system stability analysis with the observer as part of the feedback loop does not require extensive details of the existing controller and does not require a dedicated controller to achieve FTC. Parametric simulation results on the ADDSAFE nonlinear benchmark model, evaluated using an industrial functional engineering simulator shows good robust fault reconstruction and good sensor FTC performance.