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Machine translation
1. (WO1980001826) A SIGNAL CONVERTING UNIT INTENDED TO BE INCORPORATED IN A PNEUMATIC CONTROL SYSTEM
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/001826    International Application No.:    PCT/SE1980/000057
Publication Date: 04.09.1980 International Filing Date: 29.02.1980
IPC:
F15B 5/00 (2006.01), G05D 16/20 (2006.01)
Applicants:
Inventors:
Priority Data:
7901841 01.03.1979 SE
Title (EN) A SIGNAL CONVERTING UNIT INTENDED TO BE INCORPORATED IN A PNEUMATIC CONTROL SYSTEM
(FR) DISPOSITIF DE CONVERSION DE SIGNAUX DESTINE A ETRE INCORPORE DANS UN SYSTEME DE COMMANDE PNEUMATIQUE
Abstract: front page image
(EN)The unit serves to convert an electrical control signal (I) received at the input of the unit into a pneumatic signal (P). This is emitted at the output of the unit and its value should be proportional to the value of the control signal (I). The unit comprises a tongue-shaped piezoelectric element (6) which is loaded with a voltage dependent on the control signal, so that the element (6) carries out a lateral bending movement which varies with the voltage. The unit also comprises a pneumatic line (1) with a chamber (1a) which is supplied with compressed air via a throttle (4) and from which the compressed air is conducted through a nozzle (3) located near to one side of the piezoelectric element (6) so that the air pressure in the chamber is regulated by the piezoelectric element (6) as a function of the said voltage; and an outlet line (5) leading from the chamber for transmitting the regulated air pressure to the control system as the said pneumatic signal (P). To make the pneumatic signal (P) to the control system accurately follow the electrical control signal (1), a pressure transducer (7) is connected to the outlet line (5), being designed to produce an electrical signal (T) which corresponds to the regulated air pressure, and which is fed back via a feed-back circuit to the input of the unit. Furthermore, the input has a circuit (9, 11) which receives both the electrical control signal (1) and the fed-back electrical signal (T). The circuit has a device (9) for forming a difference signal by comparing the two signals (I, T) and a device (11) for integrating the difference signal and thereafter producing from the integrated difference signal the voltage with which the piezoelectric element (6) is loaded.
(FR)Un dispositif de conversion de signaux est destine a etre incorpore dans un systeme de commande pneumatique. Le dispositif sert a convertir un signal de commande electrique (1) recu a l"entree du dispositif en un signal pneumatique (P). Celui-ci est emis a la sortie du dispositif et sa valeur devrait etre proportionnelle a la valeur du signal de commande (1). Le dispositif comprend un element piezo-electrique en forme de languette (6) qui est charge sous une tension dependant du signal de commande, de sorte que l"element (6) effectue un mouvement de courbure laterale qui varie avec la tension. Le dispositif comprend egalement une canalisation pneumatique (1) avec une chambre (1a) qui est alimente e en air comprime via une soupape (4) et d"ou l"air comprime est conduit au travers d"une buse (3) situee au voisinage d"un cote de l"element piezo-electrique (6) de facon telle que la pression d"air dans la chambre soit reglee par l"element piezo-electrique (6) comme une fonction de ladite tension, et une canalisation de sortie (5) provenant de la chambre pour transmettre la pression d"air ajustee au systeme de commande sous la forme dudit signal pneumatique (P). Pour que le signal pneumatique (P) envoye au systeme de commande suive de maniere precise le signal de commande electrique (1), un transducteur de pression (7) est connecte a la ligne de sortie (5), ce transducteur etant concu pour produire un signal electrique (P) qui correspond a la pression d"air ajustee et qui est renvoyee via un circuit de reaction a l"entree du dispositif. En outre, l"entree possede un circuit (9, 11) qui recoit a la fois le signal de commande electrique (1) et le signal electrique de reaction (T). Le circuit possede un dispositif (9) de formation d"un signal differentiel en comparant les deux signaux (E, T) et un dispositif (11) d"integration du signal differentiel et de production a partir du signal differentiel integre de la tension sous laquelle l"element piezo-electrique (6) est charge.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)