Capillary fuel injector with metering valve for an internal...

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

Patent

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Details

F02M 53/06 (2006.01) F02D 41/00 (2006.01) F02M 51/06 (2006.01)

Patent

CA 2513381

A fuel injector (10) for vaporizing a liquid fuel for use in an internal combustion engine (2110). The fuel injector includes at least one capillary flow passage (12), a heat source (20) arranged along the at least one capillary flow passage (12), the heat source (20) operable to heat the liquid fuel in the at least one capillary flow passage (12) to a level sufficient to change at least a portion thereof from the liquid state to a vapor state and deliver a stream of substantially vaporized fuel from the outlet end of the at least one capillary flow passage (12); and a valve for metering fuel to the internal combustion engine, the valve located proximate to the outlet end (16) of the at least one capillary flow passage (12), the valve including a low mass member (18) for substantially occluding the stream of fuel to the internal combustion engine; wherein the low mass member (18) for substantially occluding the stream of fuel to the internal combustion engine (2110) is formed of a material having low mass and or a low coefficient of thermal conductivity. The fuel injector (10) is effective in reducing cold-start and warm-up emissions of an internal combustion engine (2110).

L'invention concerne un injecteur (10) de carburant servant à vaporiser un carburant liquide utilisé dans un moteur (2110) à combustion interne. Cet injecteur comprend au moins un passage (12) capillaire, une source (20) de chaleur placée le long de ce passage (12), ladite source (20) permettant de chauffer le carburant liquide dans le(s) passage(s) (12) à un niveau suffisant pour vaporiser au moins une partie du carburant liquide et produire un flux de carburant sensiblement vaporisé à l'extrémité de sortie du ou des passage(s) (12) capillaire(s) ; et une soupape pour doser le carburant en direction du moteur à combustion interne. La soupape se situe à proximité de l'extrémité de sortie (16) du ou des passage(s) (12) et comprend un élément (18) de faible masse servant à obstruer sensiblement le flux de carburant en direction du moteur. L'élément (18) servant à obstruer sensiblement le flux de carburant en direction du moteur (2110) est constitué d'une matière présentant une faible masse et un faible coefficient de conductivité thermique. L'injecteur (10) de carburant permet de réduire efficacement les émissions d'un moteur (2110) à combustion interne pendant la mise en action de celui-ci et le démarrage à froid.

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