Abstract

Fuzzy logic controllers are useful in chemical processes where non-linearity is very high. Fuzzy logic controllers are based on approximate values called linguistic variables. These linguistic variables are not sharp and precise. Fuzzy logic uses the concepts of fuzzy sets whose value varies from 0 to 1. The main advantages of using Fuzzy logic are reduction in rise time, settling time, overshoot etc and improved robustness and efficiency in noisy environment. Membership functions are used for inputs and outputs. Fuzzy logic controllers are capable of eliminating errors in modeling of the process. Fuzzy based PI Controllers are used to obtain better response in terms of settling time, rise time and overshoot than PI Controllers. Fuzzy based PI Controllers are using fuzzy logic concept for getting Proportional gain and integral gain for PI Controller. This process consists of two streams are mixed in three series tanks, and the output concentration is controlled by manipulating the flow of stream

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