Double-command fuzzy control of a nonlinear CSTR

Morteza Mohammadzaheri*, Lei Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


In this research, double-command control of a nonlinear chemical system is addressed. The system is a stirred tank reactor; two flows of liquid with different concentrations enter the system through two valves and another flow exits the tank with a concentration between the two input concentrations. Fuzzy logic was employed to design a model-free double-command controller for this system in the simulation environment. In order to avoid output chattering and frequent change of control command (leading to frequent closing-opening of control valves, in practice) a damper rule is added to the fuzzy control system. A feedforward (steady state) control law is also derived from the nonlinear mathematical model of the system to be added to feedback (fuzzy) controller generating transient control command. The hybrid control system leads to a very smooth change of control input, which suits real applications. The proposed control system offers much lower error integral, control command change and processing time in comparison with neuro-predictive controllers.

Original languageEnglish
Pages (from-to)19-31
Number of pages13
JournalKorean Journal of Chemical Engineering
Issue number1
Publication statusPublished - Jan 2010
Externally publishedYes


  • CSTR
  • Fuzzy Control
  • Hybrid Control
  • Nonlinear System
  • Steady State Control

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering


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