Fuzzy Split Range Control for Temperature Regulation of Continuously Stirred Tank Heater

Abstract

Fuzzy split range control structure is proposed for control of continuously stirred tank heater (CSTH) process with two split ranged valves for cooling and heating the process fluid. The proposed control scheme contains fuzzy like  proportional derivative PD  plus integral gain along with two saturation elements. The control activity is the aggregate of fuzzy like PD control action and the integral error term with scaling value. A split range is regularly utilized in circumstances wherein added control elements might be utilized, contingent upon the working situation. Fuzzy logic controller (FLC) is introduced in classical split range control method for enhancing the response of CSTH process. The initial phase in the control structure is to design PD type FLC with the used preferred  values of rise time, settling time and minimal error measures. The integral gain value decides how quickly the consistent state mistake decreases. The proposed controller has capability to give a correct positioning of two split ranged valves for regulating the temperature of process fluid. The closed loop control performance shows the adequacy and robustness of the recommended control technique. In addition, tracking and regulatory behaviors are comparatively better than traditional split range control configuration. The temperature control loop behavior of CSTH through conventional split range controller and fuzzy PD type split range control has been analyzed in connection with performance index as an integral square error (ISE).