Abstract—The liquid level control unit approximated by the first order plus time delay (FOPTD) model was considered and the proposed modified relay tuning method was applied to calculate the corrected ultimate gain (Ku). The proposed method includes the correction factor in equation for calculation of ultimate gain (Ku). The effect of ratio of time delay to time constant was observed and it was found that the error in calculation of ultimate gain by proposed method has been reduced than that of conventional method. The corrected Ku by proposed method was used to estimate PID parameters by Tyreus-Luyben method. The closed loop response was obtained using optimum values of PID parameters and compared with that of conventional method. It was found that the Integral Square Error (ISE) for conventional and proposed method is 18 and 11 respectively and hence the proposed method gives better performance.
Index Terms—Modified Relay Tuning, FOPTD, Simulink.
S. A. Misal, R. W. Gaikwad and Dr. Dhirendra are with the Department of Chemical Engineering, P.R.E.C. LONI (M.S.) India. (e-mail:misal_sunil@yahoo.co.in)
Dr. Vivek S. Sathe is with the Department of Chemical Engineering, Dr. Babasaheb Ambedkar Tech. University, Lonere. (M.S.). India.
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Cite: S. A. Misal, Vivek S. Sathe, R. W. Gaikwad and Dhirendra, "Modified Relay Tuning Method for Level Control Model," International Journal of Chemical Engineering and Applications vol. 2, no. 5, pp. 307-309, 2011.
