Indirect adaptive nonlinear control of a pH process

S. S. Yoon, T. W. Yoon, D. R. Yang, T. S. Kang

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


This paper presents an indirect adaptive control scheme for a pH process, which is difficult to control due to its nonlinear dynamics with uncertainties. A nonlinear controller is designed using a backstepping technique, which can deal with a large class of nonlinear systems with parametric uncertainties. The nonlinear controller is combined with a parameter estimator to estimate the concentrations of the reaction invariants in the wastewater stream, and the stability of the proposed adaptive scheme is proved. Simulations show that uniform closed-loop performance is obtained despite the nonlinearitics and parametric uncertainties.

Original languageEnglish
Pages (from-to)1223-1230
Number of pages8
JournalComputers and Chemical Engineering
Issue number9
Publication statusPublished - 2002 Sept 15

Bibliographical note

Funding Information:
The authors are grateful to financial support by the Korea Science and Engineering Foundation (KOSEF), Korea.


  • Adaptive control
  • Internal dynamics
  • Nonlinear control
  • Parameter estimation
  • pH control

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Computer Science Applications


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