Process control system with asymptotic auto-tuning

G - Physics – 05 – B

Patent

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G05B 13/04 (2006.01)

Patent

CA 2231733

A process control system (100) controls a non-self regulating process through a control output signal (u(t)) based on a set point YSET and a measured process variable (y(t)). The process control system includes a control circuit (102, 104, 106, 108) having a set point input, a process variable input and a control output. The control circuit generates the control output signal (u(t)) on the control output as a function of the set point YSET received on the set point input and the measured process variable (y(t)) received on the process variable input. An auto-tuning circuit (106) excites the process, estimates a process model based on an intersection between rising and falling asymptotes of the measured process variable (y(t)), and then tunes the control function to the process (110) based on the process model. The auto-tuning circuit obtains robust results, but is computationally simple such that the circuit can be implemented with hardware or software in low-power and low-memory applications, such as in field-mounted controllers.

Un système de commande de processus (100) commande un processus sans autorégulation par l'intermédiaire d'un signal de sortie de commande (u(t)) basé sur un point de consigne Y¿SET? et une variable de processus mesurée (y(t)). Le système de commande de processus comporte un circuit de commande (102, 104, 106, 108) ayant une entrée de point de consigne, une entrée de variable de processus et une sortie de commande. Le circuit de commande génère le signal de sortie de commande (u(t)) sur la sortie de commande en fonction du point de consigne Y¿SET? reçu sur l'entrée de point de consigne et la variable de processus mesurée (y(t)) reçue sur l'entrée de variable de processus. Un circuit d'auto-syntonisation (106) excite le processus, évalue un modèle de processus basé sur une intersection entre des asymptotes croissantes et décroissantes de la variable de processus mesurée (y(t)) et syntonise ensuite la fonction de commande par rapport au processus (11) basé sur le modèle de processus. Le circuit d'auto-syntonisation bien que simple sur la plant computationnel, permet d'obtenir des résultats robustes de sorte que le circuit peut être mis en place conjointement avec un matériel ou un logiciel dans des applications de faible puissance et à mémoire basse telles que dans des contrôleurs montés sur place.

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