Next generation relay autotuners—analysis and implementation

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In order to produce models for automatic controller tuning, this paper proposes a method that combines a short experiment with a novel scheme for approximating processes using low-order time-delayed models. The method produces models aimed to tune PI and PID controllers, but they could also be used for other model-dependent controllers like MPC. The proposed method has been evaluated in simulations on benchmark processes. It has also been implemented in an industrial controller and tested experimentally on a water-tank process. It is shown that our method is successful in estimating models for a variety of processes such as lag-dominated, delay-dominated, balanced, and integrating processes. We also demonstrate that the experiment time is both shorter and more predictable than currently used autotuners.
Original languageEnglish
Title of host publicationProceedings of the 5th IEEE Conference on Control Technologies and Applications (CCTA) 2021
Publication statusAccepted/In press - 2021
EventIEEE Conference on Control Technologies and Applications - Online, San Diego, United States
Duration: 2021 Aug 82021 Aug 11


ConferenceIEEE Conference on Control Technologies and Applications
Abbreviated titleCCTA
Country/TerritoryUnited States
CitySan Diego
Internet address

Subject classification (UKÄ)

  • Control Engineering


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