Self Tuning Fuzzy Logic controller with Smith structure for controlling glycerin bleaching temperature

Controlling process with lag is not an easy task. The lag can easily cause oscillation that lead to instability of the controller response. The conventional method of controlling this kind of system is not capable of giving satisfactory result. Many delay compensator and predictor methods are introduced to handle system with lag and one of the popular methods is a Smith Predictor. The problem with model base control structure is the mismatch or inaccurate model used as a predictor. This work introduced a Self Tuning Fuzzy Logic controller as an alternative method to solve a process with mismatch delays problem. With advantages of Smith Predictor and Self Tuning Fuzzy Logic Controller the purpose control structure is found giving better performance compare with conventional Fuzzy Logic controller with Smith Predictor Structure.