Active fault tolerant control of discrete event systems using online diagnostics

Paoli, Andrea, Sartini, Matteo and Lafortune, Stephane (2011) Active fault tolerant control of discrete event systems using online diagnostics. Automatica, 47 (4). pp. 639-649. ISSN 0005-1098

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The aim of this paper is to deal with the problem of fault tolerant control in the framework of discrete event systems modeled as automata. A fault tolerant controller is a controller able to satisfy control specifications both in nominal operation and after the occurrence of a fault. This task is solved by means of a parameterized controller that is suitably updated on the basis of the information provided by online diagnostics: the supervisor actively reacts to the detection of a malfunctioning component in order to eventually meet degraded control specifications. Starting from an appropriate model of the system, we recall the notion of safe diagnosability as a necessary step in order to achieve fault tolerant control. We then introduce two new notions: (i) "safe controllability", which represents the capability, after the occurrence of a fault, of steering the system away from forbidden zones and (ii) "active fault tolerant system", which is the property of safely continuing operation after faults. Finally, we show how the problem can be solved using a general control architecture based on the use of special kind of diagnoser, called "diagnosing controller", which is used to safely detect faults and to switch between the nominal control policy and a bank of reconfigured control policies. A simple example is used to illustrate the new notions and the control architecture introduced in the paper. © 2011 Elsevier Ltd. All rights reserved.

Keywords:Automata, Discrete event systems, Fault diagnosis, Fault tolerant control, Safety, Supervisory control theory, Automata theory, Control theory, Flow control, Network architecture, Online systems, Specifications, System theory, Controllers
Subjects:H Engineering > H100 General Engineering
Divisions:College of Science > School of Engineering
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ID Code:16225
Deposited On:28 May 2015 14:29

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