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

Content Provider	IEEE Xplore Digital Library
Author	Kowshik, Sumant Baliga, Girish Graham, S. Sha, L.
Copyright Year	2005
Description	Author affiliation: Illinois Univ., Urbana, IL, USA (Sumant Kowshik; Girish Baliga)
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.
Starting Page	454
Ending Page	463
File Size	449992
Page Count	10
File Format	PDF
ISBN	0769522823
DOI	10.1109/DSN.2005.26
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-28
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Robust control Networked control systems Control systems Digital control Testing Sensor systems Actuators Real time systems FDDI Delay systems
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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