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Feedback Scheduling of Control Tasks

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Author

Summary, in English

The paper presents a feedback scheduling mechanism in the context of co-design of the scheduler and the control tasks. We are particularly interested in controllers where the execution time may change abruptly between different modes, such as in hybrid controllers. The proposed solution attempts to keep the CPU utilization at a high level, avoid overload, and distribute the computing resources evenly among the tasks. The feedback scheduler is implemented as a periodic or sporadic task that assigns sampling periods to the controllers based on execution-time measurements. The controllers may also communicate feedforward mode-change information to the scheduler. As an example, we consider hybrid control of a set of double-tank processes. The system is evaluated, from both scheduling and control performance perspectives, by co-simulation of controllers, scheduler, and tanks.

Publishing year

2000

Language

English

Pages

4871-4876

Publication/Series

Proceedings of the 39th IEEE Conference on Decision and Control, 2000.

Volume

5

Document type

Conference paper

Publisher

IEEE - Institute of Electrical and Electronics Engineers Inc.

Topic

  • Control Engineering

Keywords

  • scheduling
  • feedback feedforward
  • computerised control
  • control system synthesis

Status

Published

ISBN/ISSN/Other

  • ISBN: 0-7803-6638-7