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Article | REF: R7416 V1

Analog and digital PID controllers

Authors: Alina BESANÇON-VODA, Sylviane GENTIL

Publication date: March 10, 1999 | Lire en français

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    1. Notations and structure of the PID controller

    1.1 Notations and definitions

    The structure of the control system is shown in figure 1 : the transfer function of the controller is denoted C (s ) and that of the process G (s ), where s is the Laplace variable. The transfer function of the compensated open loop is therefore :

    H BO (s ) = C (s ) G (s )

    and that of the closed loop :

    HBF(s)=HBO​(s)1+HBO​(s)

    ...

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