Relay autotuning: a use of old ideas in a new setting

Atherton, Derek P (2000) Relay autotuning: a use of old ideas in a new setting. Transactions of the Institute of Measurement and Control, 22 (1). pp. 103-122. ISSN 0142-3312

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The 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.

Item Type: Article
Additional Information: 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.
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Depositing User: Derek Atherton
Date Deposited: 06 Feb 2012 18:55
Last Modified: 02 Jul 2012 10:45
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