A Noble Fuzzy Self-Tuning Scheme for Conventional PI Controller

  • Rajani K. Mudi
  • Ritu Rani De Maity
Conference paper
Part of the Advances in Intelligent Systems and Computing book series (AISC, volume 199)


In this study, we propose an improved auto-tuning PI controller. The widely practiced Ziegler-Nichols tuned PI controller (ZNPIC) exhibits poor performance for nonlinear and high-order systems. In order to have an overall improved transient response, the proportional constant of the proposed PI controller is parameterized by a real-time nonlinear updating factor ( depending on the process trend. The value of ( is determined through a fuzzy inference engine with 49 if-then rules defined on the process error and change of error. Performance of the proposed fuzzy self-tuning ZNPIC, termed as FST-ZNPIC, is tested for second-order linear and nonlinear dead time processes including a marginally stable system under both set point change and load disturbance. Simulation results reveal our FST-ZNPIC provides significantly improved transient responses compared to other conventional and fuzzy self-tuning controllers. Robustness of FST-ZNPIC is observed with a considerable change in process dead time.


Ziegler-Nichols tuning Auto-tuning Fuzzy self-tuning 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Shinsky, F.G.: Process control systems — application, design, and tuning. McGraw-Hill, New York (1998)Google Scholar
  2. 2.
    Astrom, K.J., Hang, C.C., Person, P., Ho, W.K.: Towards intelligent PID control. Automatica 28(1), 1–9 (1992)CrossRefGoogle Scholar
  3. 3.
    Panda, S.K., Lim, J.M.S., Dash, P.K., Lock, K.S.: Gain scheduled PI speed controller for PMSM Drive. In: Proc. IEEE Industrial Electronics Society International Conference, IECON 1997, vol. 2, pp. 925–930 (1997)Google Scholar
  4. 4.
    Seborg, D.E., Edgar, T.F.: Adaptive control strategies for process control: A survey. AICHE J. 32(6), 881–913 (1986)CrossRefGoogle Scholar
  5. 5.
    Kristiansson, B., Lennartson, B.: Robust and optimal tuning of PI and PID controllers. IEE Proc. Control Theory Appl. 149(1), 17–25 (2002)CrossRefGoogle Scholar
  6. 6.
    Tursini, M., Parasiliti, F., Zhang, D.: Real time gain tuning of PI controllers for high performance PMSM drives. IEEE Trans. Industry Appl. 38(4), 1018–1026 (2002)CrossRefGoogle Scholar
  7. 7.
    Mudi, R.K., Dey, C., Lee, T.T.: An improved auto-tuning scheme for PI controllers. ISA Trans. Actions 47(1), 45–52 (2008)CrossRefGoogle Scholar
  8. 8.
    Dey, C., Mudi, R.K.: An improved auto-tuning scheme for PID controllers. ISA Transactions 48(4), 396–409 (2009)CrossRefGoogle Scholar
  9. 9.
    Hang, C.C., Cao, L.: Improvement of transient response by means of variable set-point weighting. IEEE Trans. Industrial Electronics 43(4), 477–484 (1996)CrossRefGoogle Scholar
  10. 10.
    Dey, C., Mudi, R.K., Lee, T.T.: Dynamic set-point weighted PID controller. Control Intelligent Sys. 37(4), 212–219 (2010)Google Scholar
  11. 11.
    Mudi, R.K., Dey, C.: Performance improvement of PI controllers through dynamic set-point weighting. ISA Transactions 50(2), 220–230 (2011)CrossRefGoogle Scholar
  12. 12.
    Visioli, A.: Fuzzy logic based set-point weight tuning of PID controllers. IEEE Trans. Sys. Man Cyb. 29(6), 587–592 (1999)CrossRefGoogle Scholar
  13. 13.
    He, S.Z., Tan, S., Xu, F.L., Wang, P.Z.: Fuzzy Self-Tuning of PID Controller. Fuzzy Sets and Syst. 56(1), 37–46 (1993)CrossRefMathSciNetGoogle Scholar
  14. 14.
    Maeda, M., Murakami, S.: A Self-Tuning Fuzzy Controller. Fuzzy Sets and Syst. 51(1), 29–40 (1992)CrossRefMathSciNetGoogle Scholar
  15. 15.
    Ziegler, J.G., Nichols, N.B.: Optimum settings for automatic controllers. ASME Trans. 64, 759–768 (1942)Google Scholar
  16. 16.
    Mudi, R.K., Pal, N.R.: A robust self-tuning scheme for PI and PD type fuzzy controllers. IEEE Trans. Fuzzy Syst. 7(1), 2–16 (1999)CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Dept of I.E.E.Jadavpur UniversityKolkataIndia
  2. 2.Dept of E.I.EDr. B.C. Roy Engg CollegeDurgapurIndia

Personalised recommendations