Fuzzy PD system in adaptive control systems having input saturation

Y. W. Huang, P. C. Tung

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


In a control system, modelling errors, norm-bounded uncertainties, and control input saturation are unavoidable. Control input saturation in the system can lead to severe transient oscillations and a large overshoot. This effect is caused by inappropriate plant states, and is therefore referred to as "plant windup." We propose an adaptive control system in which the gain of a proportional controller is dynamically tuned by a fuzzy PD system. The range of the output of universal discourse of the fuzzy PD system is designed based on the circle criterion to guarantee the stability of the having input saturation systems. The simulation results demonstrate the successful tracking performance and effectiveness of the proposed method.

Original languageEnglish
Pages (from-to)217-222
Number of pages6
JournalControl and Intelligent Systems
Issue number3
StatePublished - 2007


  • Anti-windup
  • Circle criterion
  • Fuzzy
  • Nyquist criterion
  • Saturation


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