G - Physics – 05 – D
Patent
G - Physics
05
D
G05D 7/06 (2006.01)
Patent
CA 2574234
A control loop (40) such as an electro-pneumatic control loop or other logical process, having a lead~lag filter (20) connected to the input thereof in particular, a reference control signal (10), such as a 4-2OmA set point signal or control signal generated by a process controller or user interface, is applied to the input of the lead-lag input filter (20) which operates on the reference signal (which can be a set point or other control signal to provide a filtered output 50 (also called a travel set point signal) to a summer (30) associated with the electro-pneumatic control loop (40), the summer (30) compares the valve travel with the travel set point signal (50) to generate an error signal, which is provided to an amplifier or gain unit (90) (called a forward path gain unit) which applies a gain K. The output of the forward path gain unit 90 is provided to a further summer (94) which sums (in this case, subtracts) a velocity feedback gain developed by a gain unit (95) and a minor loop feedback gain developed by a gain unit (105) from the output of the forward path gain unit (90).
L'invention porte sur un filtre d'entrée avance-retard reliée en amont d'une boucle de régulation de positionneur possédant un ou plusieurs accessoires de soupapes, par exemple un amplificateur de volume ou une soupape d'échappement rapide, afin de surmonter les forces dynamiques lentes expérimentées par les accessoires lors de la réception d'une commande de changement d'amplitude faible ou de signaux de valeur de réglage. Une interface utilisateur est reliée au filtre d'entrée avance-retard et permet à un opérateur ou une autre personne chargée du contrôle d'examiner et de changer les caractéristiques de fonctionnement du filtre d'entrée avance-retard afin de fournir une boucle de régulation avec n'importe quel nombre de caractéristiques de réponse désirées.
Junk Kenneth W.
Latwesen Annette L.
Fisher Controls International Llc
Ridout & Maybee Llp
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