Method of and apparatus for nonobtrusively obtaining on-line...

G - Physics – 05 – B

Patent

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G05B 23/02 (2006.01)

Patent

CA 2304616

An apparatus for nonobtrusively determining one or more parameters, such as dead band, dead time, or response time of a process control device that is connected on-line in a process control loop includes a measurement unit and a processing unit (30). The measurement unit is coupled to the process control loop to detect stochastic changes in a control signal sent to the process control device and to detect an indication of the response of the process control device to the changes in the control signal while the process control device is operating on-line. The processing unit calculates the device parameters from one or more sets of the detected changes in the control signal and the detected response indication.

L'invention se rapporte à un appareil permettant de déterminer de manière non invasive un ou plusieurs paramètres, tels que bande neutre, temps mort ou temps de réponse d'un dispositif de commande de processus qui est connecté en ligne dans une boucle de commande de processus. Cet appareil comprend une unité de mesure qui est couplée à la boucle de commande de processus de façon à détecter les modifications stochastiques d'un signal de commande envoyé au dispositif de commande de processus et pour détecter une indication de la réponse du dispositif de commande de processus aux modifications du signal de commande lorsque le dispositif de commande de processus fonctionne en ligne. Cet appareil comprend également une unité de traitement qui calcule les paramètres du dispositif à partir d'un ou de plusieurs ensembles de modifications détectées du signal de commande et de l'indication de réponse détectée.

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