Abstract

As the complexity of Cyber-Physical Systems (CPS) increases, it becomes increasingly challenging to ensure CPS reliability, especially in the presence of software and/or physical failures. The Simplex architecture is shown to be an efficient tool to address software failures in such systems. When physical failures exist, however, Simplex may not function correctly because physical failures could change system dynamics and the original Simplex design may not work for the new faulty system. To address concurrent software and physical failures, this article presents the RSimplex architecture, which integrates Robust Fault-Tolerant Control (RFTC) techniques into the Simplex architecture. It includes the uncertainty monitor, the High-Performance Controller (HPC), the Robust High-Assurance Controller (RHAC), and the decision logic that triggers the switch of the controllers. Based on the output of the uncertainty monitor, we introduce a monitor-based switching rule in the decision logic in addition to the traditional envelope-based rule. The RHAC is designed based on RFTCs. We show that RSimplex can efficiently handle a class of software and physical failures.

Original languageEnglish (US)
Article number27
JournalACM Transactions on Cyber-Physical Systems
Volume2
Issue number4
DOIs
StatePublished - Aug 2018

Keywords

  • Cyber
  • Fault-tolerant control
  • Physical failures
  • Simplex architecture

ASJC Scopus subject areas

  • Artificial Intelligence
  • Computer Networks and Communications
  • Hardware and Architecture
  • Human-Computer Interaction
  • Control and Optimization

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