Simplified IMC-PID tuning rules

Paul S. Fruehauf*, I. Lung Chien, Mark D. Lauritsen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

5 Scopus citations


We have significantly simplified the IMC-PID tuning rules. These new rules cover the vast majority of control loops encountered in the chemical industry. This work is the result of a great deal of experience in successfully applying IMC-PID tuning rules and an effort to prepare a training course on controller tuning. The simplified rules are very similar in form to the classic open loop Ziegler-Nichols rules and use the process reaction curve method for process testing. The two differences are that these rules are based on a less aggressive performance criteria and that we adapt the rules for some commonly encountered special cases. This paper presents the relationship between the simplified IMC-PID rules, the general IMC-PID rules, the Ziegler-Nichols rules and the Cohen-Coon rules. We show that the simplified rules are less sensitive to parameter mis-estimation than other more aggressive tuning rules. We also proposed rules for a fourth action; filtering. Filtering is available in digital controllers and smart field transmitters. We report that filtering and derivative action cancel each other and therefore should not be used together. We briefly outline the contents of the tuning course and finish the paper with an industrial example where the simplified rules have been successfully applied.

Original languageEnglish
Title of host publicationAdvances in Instrumentation and Control
Subtitle of host publicationInternational Conference and Exhibition
Editors Anon
PublisherPubl by Instrument Society of America
Number of pages22
Editionpt 3
ISBN (Print)1556174632
StatePublished - 1993
Externally publishedYes
EventISA/93 International Conference, Exhibition & Training Program. Part 3 (of 3) - Chicago, IL, USA
Duration: 19 09 199324 09 1993

Publication series

NameAdvances in Instrumentation and Control : International Conference and Exhibition
Numberpt 3
ISSN (Print)1054-0032


ConferenceISA/93 International Conference, Exhibition & Training Program. Part 3 (of 3)
CityChicago, IL, USA


Dive into the research topics of 'Simplified IMC-PID tuning rules'. Together they form a unique fingerprint.

Cite this