Relaxing signal delay constraints in distributed embedded controllers

D. Goswami, R. Schneider, S. Chakraborty

Research output: Contribution to journalArticleAcademicpeer-review

23 Citations (Scopus)
135 Downloads (Pure)

Abstract

Embedded systems often involve transmitting feedback signals between multiple control tasks that are implemented on different electronic control units communicating via a shared bus. For ensuring stability and control performance, such designs require all control signals to be delivered within a specified deadline, which is ensured through appropriate timing or schedulability analysis. In this brief, we study controller design that allows control feedback signals to occasionally miss their deadlines. In particular, we provide analytical bounds on deadline misses such that the control loop retains its stability and meets its control performance requirements. We argue that such relaxation allows us to 1) use lower quality communication resources (e.g., event-triggered instead of time-triggered communication) and 2) provide more flexibility-e.g., use simulation-in communication timing analysis since analytical worst-case delay bounds for real-life communication protocols are often pessimistic. We illustrate this approach using the FlexRay communication protocol for distributed automotive control systems.
Original languageEnglish
Pages (from-to)2337-2345
Number of pages9
JournalIEEE Transactions on Control Systems Technology
Volume22
Issue number6
DOIs
Publication statusPublished - 2014

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