Asynchronous Fault-Tolerant Control Against Infinite Cycle Faults With Application to a Space-Borne Digital System
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This article presents a fault-tolerant corrective control methodology for input/state asynchronous sequential machines (ASMs) in the state-burst feedback configuration. The controlled ASM is vulnerable to infinite cycle faults, causing the ASM to undergo indefinite oscillation along a finite state trajectory. The harshest fault situation is considered where an infinite cycle fault may occur in both fundamental and non-fundamental mode operations. In the context of corrective control theory, the existence condition and design procedure for a proper state-burst feedback control scheme are addressed to make the closed-loop system immune to the influence of any infinite cycle faults. To validate the practicality and efficacy of the proposed fault-tolerant control scheme, an application study for a practical space-borne digital system on field-programmable gate array (FPGA) circuitry is provided with convincing experimental results.
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