Autosoft Journal

Online Manuscript Access

Fuzzy Sliding Mode Controller for a PH Process in Stirred Tanks



The pH control is a difficult problem. This is due to the strong non-linearity and extreme sensitivity to disturbances in the neighborhood of the neutrality point. A Fuzzy Sliding Mode Controller (FSMC) which combines a Variable Structure Control with sliding modes (VSC) and the fuzzy logic theory to adjust the controller gains, for pH control (neutralization and regulation), is presented in this work. The FSMC was designed by considering the non-linearities and the uncertainties of the pH process. The controller uses the Smith predictor structure to deal with the effect of the time delay characteristic of this kind of process. It is shown how the FSMC can improve the response of the conventional VSC applied to pH process It will be possible to observe that the required times to reach the steady-state is significantly improved. Simulation results for the pH process are presented with comparisons between the VSC and FSMC.



Total Pages: 19
Pages: 349-367


Manuscript ViewPdf Subscription required to access this document

Obtain access this manuscript in one of the following ways

Already subscribed?

Need information on obtaining a subscription? Personal and institutional subscriptions are available.

Already an author? Have access via email address?


Volume: 18
Issue: 4
Year: 2012

Cite this document


S. Arulselvi, C. Ramesh Kumar, G. Uma and M. Chidambaram, “Design of fuzzy sliding mode control for DC-DC converter”. Proc. Int. Conf. on Intelligent Sensing and Information Processing, pp. 217–222, 2005.

H. Delavari and A.R. Noiey, “Genetic-based Fuzzy Sliding Mode Control of an Interconnected Twin-Tanks”. EUROCON, The Inte. Conf. on “Computer as a Tool”, 2007, pp. 714–719, 2007.

T. Heckenthaler and S. Engell, “Fuzzy-logic controller-design for pH-control in a CSTR”, Proc. of 4

C.C. Kung and S.C. Lin, “A fuzzy-sliding mode controller design”. IEEE Int. Conf. on Systems Engineering, pp. 608–611, 1992.

H.Ch. Lu and T.H. Hung, “Fuzzy sliding mode controller design with variable sliding surface”. IEEE 3rd Int. Conf. on Computational Cybernetics, ICCC, pp. 47–52, 2005.

M.A.A. Morsy, M.S.A. Moteleb and H.T. Dorrah, “Development of Robust Fuzzy Sliding Mode Control Technique for Nonlinear Drive Systems”. Int. Symposium on Micro-Nano Mechatronics and Human Science, pp. 1–6, 2006.

P. Resende and L.E. Zarate, “Control of a pH Process using Variable Structure Regulator and Smith Preditor”. 17


ISSN PRINT: 1079-8587
ISSN ONLINE: 2326-005X
DOI PREFIX: 10.31209
10.1080/10798587 with T&F
IMPACT FACTOR: 0.652 (2017/2018)

SJR: "The two years line is equivalent to journal impact factor ™ (Thomson Reuters) metric."

Journal: 1995-Present


TSI Press
18015 Bullis Hill
San Antonio, TX 78258 USA
PH: 210 479 1022
FAX: 210 479 1048