Title :
A fuzzy logic and variable structure based controller for pH control
Author :
Zárate, Luis E. ; Resende, Peterson ; Menezes, Benjamin
Author_Institution :
Pontifical Catholic Univ. of Minas Gerais, Brazil
Abstract :
The pH control is a difficult problem to solve. This is due strong nonlinearities and extreme sensitivity to disturbances in the process. The possible combination of the variable structure system with fuzzy logic theory for the pH problem is treated. This paper shows how this theory can improve the variable structure controller applied to this process. A Smith predictor is utilized to account for the pH process time delay. This paper proposes the controller gains adjustment by means of fuzzy logic. The simulation results obtained are presented
Keywords :
chemical industry; delays; fuzzy control; pH control; predictive control; process control; variable structure systems; Smith predictor; continuous stirred tank reactors; control nonlinearities; fuzzy control; fuzzy logic; pH control; predictive control; process control; sliding modes; time delay; variable structure system; Chemical industry; Continuous-stirred tank reactor; Delay effects; Fuzzy logic; Fuzzy sets; Performance gain; Sliding mode control; Uncertain systems; Variable structure systems; Wastewater treatment;
Conference_Titel :
Industrial Electronics Society, 2001. IECON '01. The 27th Annual Conference of the IEEE
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-7108-9
DOI :
10.1109/IECON.2001.976450
