Autotuning positive feedback time delay controller for dead time processes

K. M. Tsang, A. Besharati Rad, Wai Lok Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)


Biased relay feedback tests are applied to dead time processes to obtain their ultimate gains and ultimate frequencies. First-order process with dead time models are then fitted to the estimated gains and frequencies. A time delay controller that incorporates a simple compensator with a delay element in positive feedback can be derived from the fitted model. The time delay controller gives better performance comparing with classical Ziegler and Nichols tuned PID controller. Experimental study is included to demonstrate the effectiveness of the proposed tuning scheme and the time delay control algorithm.
Original languageEnglish
Pages (from-to)51-56
Number of pages6
JournalISA Transactions
Issue number1
Publication statusPublished - 1 Jan 2002


  • Autotuner
  • Dead time
  • Relay test

ASJC Scopus subject areas

  • Instrumentation
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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