A Learning-based Active Fault-tolerant Control Framework of Discrete-event Systems
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چکیده
A fault-tolerant controller is a controller that drives the plant to satisfy control specifications under both nominal operation and after the occurrence of faults. This paper introduces a framework that ensures the fault-tolerance of a discrete-event system (DES) plant, which includes: (i) a nominal supervisor with respect to the nominal plant to ensure the control specification that is prior to the occurrence of a fault, and this supervisor is continued to be applied to enforce a safety specification even after a fault until its detection; (ii) a fault diagnoser such that a fault can always be detected within a bounded delay of its occurrence; (iii) a post-fault supervisor to eventually satisfy, possibly with an elegant degradation, an online generated post-fault control specification. Moreover, to deal with unmodeled plant dynamics and environment uncertainties, we adopt an L∗-learning based approach to the design of both the diagnoser and the supervisors. An illustrative example is provided to detail the control framework introduced in this paper.
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تاریخ انتشار 2015