Method for analysing the step-by-step injection rate...

F - Mech Eng,Light,Heat,Weapons – 02 – M

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F02M 65/00 (2006.01) G01F 9/00 (2006.01)

Patent

CA 2734993

The method of the invention includes the injection of fuel in a first constant-volume measuring chamber (3) in which the pressure (P) and the temperature (T) are measured, and the partial draining of said first chamber into a second variable-volume measuring chamber (8) based on the movement of a piston (11), said movement being measured, wherein the partial draining of the first chamber into the second chamber after an injection is carried out until the pressure (Po) existing in the first chamber before the injection is recovered. The draining of the first chamber into the second after each injection is carried out several times consecutively, and the second chamber itself is drained each time. The volumetric measures made by moving the piston (11) for each filling/draining of the second chamber are added in order to obtain a total volume. The method is useful for high injection rates.

Le procédé comprend l'injection de carburant dans une première chambre de mesure (3), de volume constant, où sont mesurées la pression (P) et la température (T), et la vidange partielle de cette première chambre vers une seconde chambre de mesure (8), de volume variable selon le déplacement d'un piston (11), déplacement qui est mesuré, la vidange partielle de 1 a première chambre dans la seconde chambre après une injection étant faite jusqu'à retrouver dans la première chambre la pression (Po) régnant avant l'injection. La vidange de la première chambre dans la seconde, après chaque injection, est effectuée en plusieurs fois successivement, et la seconde chambre est elle-même vidangée à chaque fois. Les mesures volumiques par déplacement du piston (11), pour chaque remplissage/vidange de la seconde chambre, sont additionnées de manière à obtenir un volume total. Ce procédé s'applique aux gros débits d'injection.

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