Systems and methods for limiting integral calculation...

G - Physics – 05 – B

Patent

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G05B 11/42 (2006.01) G05B 5/01 (2006.01)

Patent

CA 2396004

A control apparatus is disclosed that comprises a primary proportional, integral, differential (APID@) controller capable of receiving a first setpoint and a first process variable and generating therefrom a second setpoint; and a secondary controller capable of receiving the second setpoint and a second process variable and generating therefrom an output control signal, wherein the primary PID controller is capable of receiving from the secondary controller a feedback signal 1) that indicates that a previous value of the second setpoint exceeds a limit associated with an output control signal of the secondary controller, and 2) that transfers a value of a signal from the secondary controller. The primary PID controller is then capable of limiting the contribution of the integral calculation component in a PID calculation that generates a new current value of the second setpoint. The integral calculation component may be excluded, included, or partially included in the PID calculation in order to efficiently minimize the effect of undesirable erratic output signals.

L'invention concerne un appareil de commande comprenant un contrôleur proportionnel-intégral-différentiel primaire (APID@) capable de recevoir un premier point de consigne et une première variable de processus et de produire à partir de ce point de consigne et de cette variable de processus un second point de consigne; et un contrôleur secondaire capable de recevoir le second point de consigne et la seconde variable de processus et de produire à partir de ce second point de consigne et de cette seconde variable de processus un signal de commande de sortie. Le contrôleur PID primaire est capable de recevoir du contrôleur secondaire un signal de réaction: 1) qui indique qu'une valeur précédente du second point de consigne dépasse une limite associée à un signal de commande de sortie du contrôleur secondaire, et 2) qui transfère une valeur d'un signal du contrôleur secondaire. Le contrôleur PID primaire est ensuite capable de limiter la contribution du composant de calcul intégral dans un calcul PID qui génère une nouvelle valeur de courant du second point de consigne. Ce composant de calcul intégral peut être exclu, inclus ou partiellement inclus dans le calcul PID afin de minimiser efficacement l'effet de signaux erratiques de sortie indésirables.

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