Feedback-Invariant Approach to Time-Delay Estimation for Performance Monitoring

Christopher A. HARRISON*, S. Joe QIN

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

2 Citations (Scopus)


A simple time-delay estimation approach that requires temporarily retuning the existing PID controller is presented. Closed-loop output data are fitted with autoregressive moving average models at two different controller tunings. The time delay is determined by using the feedback-invariance principle that the closed-loop impulse response coefficients do not change inside the time-delay window. This approach requires no intervention to plant operation and does not estimate the open-loop process model but the time delay only. The estimated time delay is particularly suitable for use in control performance monitoring. © 2012 American Chemical Society.
Original languageEnglish
Pages (from-to)9094-9100
Number of pages7
JournalIndustrial and Engineering Chemistry Research
Issue number26
Early online date25 Jun 2012
Publication statusPublished - 4 Jul 2012
Externally publishedYes


Dive into the research topics of 'Feedback-Invariant Approach to Time-Delay Estimation for Performance Monitoring'. Together they form a unique fingerprint.

Cite this