Co-design based approach to improve robustness in networked control systems

Sumant Kowshik, Girish Baliga, Scott Graham, Lui Sha

Research output: Contribution to conferencePaperpeer-review

Abstract

Traditional control systems consist of sensors, controllers, and actuators operating with tight periodic dependencies, and communicating over dedicated real-time channels such as CAN or FDDI. However, best effort networks such as 802.11 are being increasingly used in such systems. The unpredictable delays and losses in such networks violate the periodicity assumptions of digital control design, and the consequent fail-safe actions incur significant performance penalties. In this paper, we propose a co-design based approach to address the periodicity requirements of digital control design, and improve robustness by extending deadlines through graceful degradation to the fail-safe action. In particular, we analytically demonstrate significant deadline extensions in the control loop of a traffic control testbed based on our approach. Such deadline extensions also facilitate fault tolerance techniques such as component restarts, and system management mechanisms such as online component upgrades. We validate the results by experiments in the testbed.

Original languageEnglish (US)
Pages454-463
Number of pages10
DOIs
StatePublished - Nov 9 2005
Event2005 International Conference on Dependable Systems and Networks - Yokohama, Japan
Duration: Jun 28 2005Jul 1 2005

Other

Other2005 International Conference on Dependable Systems and Networks
CountryJapan
CityYokohama
Period6/28/057/1/05

ASJC Scopus subject areas

  • Software
  • Hardware and Architecture
  • Computer Networks and Communications

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