Publication record · 18.cifr/1942.ziegler.zn-pid-tuning
18.cifr/1942.ziegler.zn-pid-tuningIn 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.
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The formulas target quarter-decay-ratio response, which may not be optimal for all processes; future work could derive rules for ITAE or ISE criteria. The method assumes linear time-invariant dynamics and extensions to nonlinear processes remain important. Modern auto-tuning relay feedback methods (Astrom-Hagglund) directly address the original method's tendency to produce aggressive, oscillatory tuning.