Adaptive bias controller

Details Adaptive bias controller Adaptive bias controller

G - Physics

05

B

G05B 11/42 (2006.01) G05B 13/02 (2006.01) G05B 13/04 (2006.01)

Patent

CA 2229937

A process controller (100) controls an integrating type process (112) based on a measured process variable (y(t)) and a set point (Y SET). The process controller (100) includes an error generating circuit (102), a non-integrating control circuit (104) and an adaptive bias circuit (108). The error generating circuit (102) generates an error signal (e(t)) based on a difference between the set point (Y SET) and the measured process variable (y(t)). The control circuit (104) generates a control signal (u(t)) as a function of the error signal (e(t)). The adaptive bias circuit (108) adds a bias value to the control signal (u(t)), the measured process variable (y(t)) or the set point (Y SET). The bias value is selectively updated as a function of the error signal (e(t)) to force the error signal (e(t)) toward zero.

Un contrôleur de processus (100) commande un processus du type à intégration (112) basé sur une variable de processus mesurée (y(t)) et un point de consigne (Y>consigne<). Le contrôleur de processus (100) comporte un circuit de génération d'erreurs (102), un circuit de commande de non intégration (104) et un circuit de polarisation adaptatif (108). Le circuit de génération d'erreurs (102) génère un signal d'erreur (e(t)) basé sur la différence entre le point de consigne (Y>consigne<) et la variable de processus mesurée (y(t)). Le circuit de commande (104) génère un signal de commande (u(t)) en fonction du signal d'erreur (e(t)). Le circuit de polarisation adaptatif (108) ajoute une valeur de polarisation au signal de commande (u(t)), à la variable de processus mesurée (y(t)) ou au point de consigne (Y>consigne<). La valeur de polarisation est mise à jour sélectivement en fonction du signal d'erreur (e(t)) pour forcer vers zéro le signal d'erreur (e(t)).

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