Relay-tuned FSA control for unstable processes with deadtime

Q. G. Wang, T. H. Lee, K. K. Tan

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


In this paper, the control of open-loop unstable processes with deadtime is considered. Astrom's relay auto-tuning for PID regulators is extended to such processes. Some conditions for limit cycles under relay feedback are given. A first-order unstable rational function plus deadtime is employed to model a class of the processes with a single employed to model a class of the processes with a single unstable pole and deadtime. Its parameters are extracted from a relay feedback experiment. The modified finite spectrum assignment is used to control such a process and a simple method is then developed to obtain the closed-form control law for ease of real-time implementation. It is also shown that so auto-tuned MFSA system is practically stable in the face of perturbations in process dynamics. Simulation examples are included for illustration.

Original languageEnglish
Pages (from-to)311-315
Number of pages5
JournalProceedings of the American Control Conference
Publication statusPublished - 1995
Externally publishedYes
EventProceedings of the 1995 American Control Conference. Part 1 (of 6) - Seattle, WA, USA
Duration: 21 Jun 199523 Jun 1995

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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