Publication
Actuator fault-tolerant control based on set separation
Journal Article (2010)
Journal
International Journal of Adaptive Control and Signal Processing
Pages
1070-1090
Volume
24
Number
12
Doc link
http://dx.doi.org/10.1002/acs.1181
File
Abstract
In this paper, an actuator fault-tolerant control (FTC) strategy based on set separation is presented. The proposed scheme employs a standard configuration consisting of a bank of observers which match the different fault situations that can occur in the plant. Each of these observers has an associated estimation error with a distinctive behaviour when a estimator matches the current fault situation of the plant. With this information from each observer, a fault diagnosis and isolation (FDI) module is able to reconfigure the control loop by selecting the appropriate stabilising controller from a bank of precomputed control laws, each of them related to one of the considered fault models. The control law consists of a reference feedforward term and a feedback gain multiplying the state estimate provided by the matching observer. A novel feature of the proposed scheme resides in the decision criteria of the FDI, which is based on the computation of sets towards which the output estimation errors related to each fault scenario and for each control configuration converge. Conditions for the design of the FDI module and for fault tolerant closed-loop stability are given, and the effectiveness of the approach is illustrated by
means of a numerical example.
Categories
control system synthesis, control theory, model reference adaptive control systems.
Author keywords
fault-tolerant control, actuator faults, fault diagnosis and isolation, invariant sets
Scientific reference
C. Ocampo-Martínez, J.A. De Doná and M. Seron. Actuator fault-tolerant control based on set separation. International Journal of Adaptive Control and Signal Processing, 24(12): 1070-1090, 2010.
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