Method for determining fuel pressure in an injection ramp of a vehicles IC engine in transitory regime

The engine(16) is fed with fuel by a fuel feed pipe(15) which is regulated at constant pressure by a regulator(14) and supplied from a constant flow electric fuel pump(12). The engine is also supplied with air at a measured or evaluated admission pressure. The method has the following stages: - veri...

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Bibliographic Details
Main Authors ATANASYAN ALAIN ANTRANIK, BOUILLON JEROME
Format Patent
LanguageEnglish
French
Published 31.10.1997
Edition6
Subjects
BLASTING
COMBUSTION ENGINES
CONTROLLING COMBUSTION ENGINES
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
LIGHTING
MECHANICAL ENGINEERING
WEAPONS
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Summary:The engine(16) is fed with fuel by a fuel feed pipe(15) which is regulated at constant pressure by a regulator(14) and supplied from a constant flow electric fuel pump(12). The engine is also supplied with air at a measured or evaluated admission pressure. The method has the following stages: - verify that the admission variation pressure ( PI a) exceeds a step value so as to establish that the engine is in a transitory regime; - measure the intensity(I) of the control current of the pump(12) when the engine is in the transitory regime and; - deduce the value of the pressure(P) of the fuel in the injection ramp(16). The fuel regulator(14) is placed in proximity to a fuel reservoir(11) of the pump(12). To determine the fuel pressure(P) as a function of current(I) the following method is used: - read from a cartograph giving for each current value(I) a given flow(Q) for the pump(12), the value of the fuel pressure(P) in the injection ramp(16) La présente invention concerne un procédé de détermination de la pression de carburant régnant dans une rampe d'injection d'un moteur à combustion interne en régime transitoire, ledit moteur étant alimenté en carburant par une canalisation d'amenée en carburant régulée à une pression constante par un régulateur de pression (14) et alimentée par une pompe électrique à carburant (12) à débit constant, ledit moteur étant également alimenté en air à une pression d'admission mesurée ou évaluée, ledit procédé selon l'invention étant caractérisé en ce qu'il consiste à:- vérifier que la variation de la pression d'admission DELTAPa dépasse une valeur seuil afin d'établir que le moteur entre dans un régime transitoire,- mesurer l'intensité (1) du courant de commande de la pompe, lorsque le moteur est en régime transitoire, et- en déduire la valeur de la pression (P) de carburant dans la rampe d'injection.
Bibliography:Application Number: FR19960005388