An Augmented Self-tuning Fuzzy Logic Controller with Its Real-Time Implementation

Part of the Advances in Intelligent Systems and Computing book series (AISC, volume 199)


A self-tuning fuzzy PI controller (STFPIC1) is reported elsewhere whose output scaling factor (SF) is continuously adjusted by a fuzzy gain modifying factor(, which is further multiplied by an empirically chosen constant, irrespective of the type of process. Instead of such a fixed value, here, we propose to augment the gain modifier ( based on the process dynamics, which is closely related to its critical point, i.e., ultimate gain and ultimate period. The critical point is obtained by conducting relay-feedback experiment. Thus, the overall output SF of the proposed augmented self-tuning fuzzy PI controller (STFPIC2) will be more rational, as its design considers the dynamics of the process. Performance of the proposed controller is studied for a number of high-order dead-time processes under both set-point change and load disturbance. Performance comparisons with other FLCs are provided in terms of various performance indices. Effectiveness of the proposed STFPIC2 is tested through real-time implementation on a practical temperature control system.


Self-tuning fuzzy control Critical point Relay-feedback 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Sugeno, M.: Industrial Applications of Fuzzy Control. Elsevier Sc, Amsterdam (1985)Google Scholar
  2. 2.
    Harris, C.J., Moore, C.G., Brown, M.: Intelligent Control - Aspects of Fuzzy Logic and Neural Nets. World Scientific, Singapore (1993)MATHGoogle Scholar
  3. 3.
    Ying, H., Siler, W., Buckley, J.J.: Fuzzy Control Theory: A Nonlinear Case. Automatica 26, 513–520 (1990)CrossRefMATHMathSciNetGoogle Scholar
  4. 4.
    Boverie, S.: Fuzzy Logic Control for High-order Systems. In: Proc. 2nd IEEE Int. Conf. on Fuzzy Systems, pp. 117–121 (1993)Google Scholar
  5. 5.
    Lee, J.: On Methods for Improving Performance of PI-Type Fuzzy Logic Controllers. IEEE Trans. on Fuzzy Syst. 1, 298–301 (1993)CrossRefGoogle Scholar
  6. 6.
    Nomura, H., Hayashi, I., Wakami, N.: A Self-Tuning Method of Fuzzy Control by Decent Method. In: Proc. IFSA 1991, pp. 155–158 (1991)Google Scholar
  7. 7.
    Chung, H.Y., Chen, B.C., Lin, J.J.: A PI-type Fuzzy Controller with Self-tuning Scaling Factors. Fuzzy Sets and Syst. 93, 23–28 (1998)CrossRefGoogle Scholar
  8. 8.
    Mudi, R.K., Pal, N.R.: A Robust Self-Tuning Scheme for PI and PD Type Fuzzy Controllers. IEEE Trans. on Fuzzy Systems 7, 2–16 (1999)CrossRefGoogle Scholar
  9. 9.
    Palm, R.: Scaling of Fuzzy Controller Using the Cross-Correlation. IEEE Trans. on Fuzzy Syst. 3, 116–123 (1995)CrossRefGoogle Scholar
  10. 10.
    Mudi, R.K., Pal, N.R.: A Self-Tuning Fuzzy PI Controller. Fuzzy Sets and Systems 115, 327–338 (2000)CrossRefMATHGoogle Scholar
  11. 11.
    Li, H.X., Gatland, H.B.: Conventional Fuzzy Control and Its Enhancement. IEEE Trans. on Syst., Man, Cybern. 26, 791–797 (1996)CrossRefGoogle Scholar
  12. 12.
    Mudi, R.K., Pal, N.R.: A Self-Tuning Fuzzy PD Controller. IETE Journal of Research 44, 177–189 (1998)Google Scholar
  13. 13.
    Pal, A.K., Mudi, R.K.: Self-Tuning Fuzzy PI controller and its application to HVAC system. Int. Journal of Computational Cognition 6, 25–30 (2008)Google Scholar
  14. 14.
    Mudi, R.K., Dey, C., Lee, T.T.: An improved auto-tuning scheme for PI controllers. ISA Transactions 47, 45–52 (2008)CrossRefGoogle Scholar
  15. 15.
    Dey, C., Mudi, R.K.: An improved auto-tuning scheme for PID controllers. ISA Tranactions 48, 396–409 (2009)CrossRefGoogle Scholar
  16. 16.
    Mudi, R.K., Dey, C.: Performance improvement of PI controllers through dynamic set-point weighting. ISA Transactions 50, 220–230 (2011)CrossRefGoogle Scholar
  17. 17.
    Palm, R.: Sliding Mode Fuzzy Control. In: Proc. 1st IEEE Int. Conf. on Fuzzy Systems, pp. 519–526 (1992)Google Scholar
  18. 18.
    Dirankov, D., Hellendoorn, H., Reinfrank, M.: An Introduction to Fuzzy Control. Springer, NY (1993)CrossRefGoogle Scholar
  19. 19.
    Åström, K.J., Hägglund, T.: Automatic Tuning of Simple Regulators with Specifications on Phase and Amplitude Margins. Automatica 20, 645–651 (1984)CrossRefMATHGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Rajani K. Mudi
    • 1
  • D. Simhachalam
    • 1
  • Arindam Mondal
    • 1
  1. 1.Dept. of Inst. & Electronics EnggJadavpur UniversityKolkataIndia

Personalised recommendations