Mechanical air fuel ratio regulating carburettor with fuel...

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

Patent

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F02M 7/22 (2006.01) F02M 17/12 (2006.01) F02M 19/00 (2006.01)

Patent

CA 2592045

Described is a carburettor (8), comprising an air (2) inlet with a mechanically adjustable air valve (3), an into the air inlet coming mechanically adjustable atomiser, and a mechanical metering device connected with the air valve and the atomiser, maintaining a stoichiometric ratio between amounts of air and fuel. Furthermore the carburettor has fuel pressure regulating means/devices (13) that are equipped to influence the fuel pressure, in dependence of one or more dynamic engine load parameters, under which the vacuum signal in the air inlet, which is obtained via a vacuum intake conduit (12) coming into the air inlet (2). By regulating the fuel pressure also in dependence of the measured vacuum signal, the emission of unburned fuel is reduced under certain dynamic conditions of the combustion engine.

L'invention concerne un carburateur (8) comprenant une admission d'air (2) à soupape d'air (3) mécaniquement réglable, un atomiseur réglable mécaniquement entrant dans l'admission d'air, et un dispositif de mesure mécanique relié à la soupape d'air et à l'atomiseur, maintenant un rapport stoechiométrique entre des quantités d'air et de carburant. En outre, le carburateur est doté de moyens/dispositifs (13) de régulation de la pression de carburant qui sont équipés de façon à influencer la pression de carburant, en fonction d'un ou de plusieurs paramètres de charge dynamique du moteur, parmi lesquels le signal de vide dans l'admission d'air, que l'on obtient par le biais d'un conduit d'aspiration de vide (12) entrant dans l'admission d'air (2). La régulation de la pression de carburant, également en fonction du signal de vide mesuré, permet de réduire l'émission de carburant non brûlé sous certaines conditions dynamiques du moteur à combustion.

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