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Relay autotuning: a use of old ideas in a new setting
journal contribution
posted on 2023-06-07, 21:46 authored by Derek P AthertonThe paper discusses the relatively new approach of relay autotuning and shows how a sound understanding of the approach requires knowledge of two approaches introduced early in the search for methods to study nonlinear control systems. The two approaches - the describing function method and procedures for evaluating limit cycles exactly in relay systems - are first reviewed. After a short section on techniques for choosing parameters of fixed controllers it is shown how relay autotuning can be used for PID controllers based on either plant critical point information or the estimation of a plant model. Finally some examples are given which illustrate the controller design techniques presented.
History
Publication status
- Published
Journal
Transactions of the Institute of Measurement and ControlISSN
0142-3312Publisher
SAGE PublicationsExternal DOI
Issue
1Volume
22Page range
103-122ISBN
0142-3312Department affiliated with
- Engineering and Design Publications
Notes
The paper was invited for a special edition on relay autotuning of PID controllers. The paper first reviews the loop cycling method and exact methods for finding limit cycles in relay feedback systems, on which the author is an acknowledged world leader (see his 1975 book). One disadvantage of the autotuning method, suggested by Astrom, is that the loop must be opened to convert the controller to a relay. The paper then presents a new contribution showing how this can be avoided by obtaining results for a limit cycle when the relay is placed in parallel with the controller.Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-06Usage metrics
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