Cross-coupled ratio control structure

Engin Yesil*, Mujde Guzelkaya, Ibrahim Eksin, O. Aydin Tekin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


In this paper, a cross-coupled ratio control structure with two blend stations has been proposed. The main feature of the proposed structure is to give a good ratio performance for both set-point changes and load disturbances that might occur in any one of the two loops. A simple tuning procedure for the inner controllers of the two loops and an easy design methodology for the blend stations have been proposed in order to avoid any significant tuning and design effort for the implementer. The proposed structure is realized on a microcontroller based system. This cross-coupled ratio control structure that has been embedded into the microcontroller is then used to maintain the prescribed ratio "a" of the two processes, namely heat transfer process trainer (PT 326-Feedback) and process control simulator (PCS 327-Feedback). The same two processes are run under another alternative ratio control structure and the results are compared with each other.

Original languageEnglish
Pages (from-to)523-536
Number of pages14
JournalInstrumentation Science and Technology
Issue number5
Publication statusPublished - Sept 2007


This work is partially supported by a project given to the Scientific Research Project (SPR-BAP 31689) of Institute of Science and Technology of Istanbul Technical University.

FundersFunder number
Istanbul Teknik Üniversitesi


    • Blend station
    • Disturbance rejection
    • Micro-controller based application
    • Process control
    • Ratio control


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