Automatic tuning of gain-scheduled control for asymmetrical processes

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

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


This paper presents an automatic tuning procedure for gain-scheduled control of asymmetrical processes. A modified relay feedback is employed to obtain a frequency response estimation for the dual dynamics of the asymmetrical process, where a novel gain-matching and frequency-matching method is developed to correct an asymmetry phenomenon associated with the oscillations induced from a direct application of basic relay feedback. Based on the frequency response estimation and a closed-loop identification of the process gain, two first-order transfer function models are fitted to the process. Subsequently, a gain-scheduled PI control can be tuned according to the process models, so that the compensated system satisfies user-specified gain and phase margin requirements. Simulation examples are provided for illustration.

Original languageEnglish
Pages (from-to)1353-1363
Number of pages11
JournalControl Engineering Practice
Issue number11
Publication statusPublished - Nov 1998
Externally publishedYes


  • Asymmetrical processes
  • Gain scheduling
  • Process identification
  • Relay auto-tuning

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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