Optimum Setting for Automatic Controllers

Journal of Dynamic Systems Measurement and Control (Impact Factor: 0.98). 06/1993; DOI: 10.1115/1.2899060


In this paper, the three principal control effects found in present controllers are examined and practical names and units of measurement are proposed for each effect. Corresponding units are proposed for a classification of industrial processes in terms of the two principal characteristics affecting their controllability. Formulas are given which enable the controller settings to be determined from the experimental or calculated values of the lag and unit reaction rate of the process to be controlled. These units form the basis of a quick method for adjusting a controller on the job. The effect of varying each controller setting is shown in a series of chart records. It is believed that the conceptions of control presented in this paper will be of assistance in the adjustment of existing controller applications and in the design of new installations.

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    • "Here, a PI controller is used with the values K p and T n determined by the Ziegler-Nichols method, cf. Ziegler and Nichols (1942). "
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    • "Neste artigo utilizou-se o método Z-N proposto por (Ziegler and Nichols, 1942). Nesta regra, os parâmetros K p , T i e T d do controlador são computados a partir dos valores de ganho K u e período P u críticos utilizando-se de fórmulas previamente estabelecidas. "
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    • "In spite of considerable advances in the recent control theory, it is common knowledge that PI and PID controllers are most widely and successfully used in industrial applications [1]. A great attention of numerous researchers during the last few decades was devoted to tuning rules [2] [3] [4], identification and adaptation schemes [5] [6] in order to fetch out the best PI and PID controllers in accordance with the assigned design objectives. The most recent results have concern with the problem of PI and PID controller design for linear systems. "
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