Method and apparatus for dual fuel injection into an...

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

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F02D 19/08 (2006.01) F02B 1/12 (2006.01) F02B 7/00 (2006.01) F02B 7/08 (2006.01) F02B 23/06 (2006.01) F02B 43/00 (2006.01) F02B 69/04 (2006.01) F02D 19/02 (2006.01) F02D 19/10 (2006.01) F02D 41/00 (2006.01) F02D 41/30 (2006.01) F02D 41/40 (2006.01) F02M 21/02 (2006.01) F02B 3/06 (2006.01) F02B 75/02 (2006.01)

Patent

CA 2398149

Two different fuels are injected into the combustion chamber of an internal combustion engine. A main fuel is ignited by a pilot fuel that is more readily auto-ignitable than the main fuel. According to the method, load conditions on the engine are monitored and sets of conditions are defined to constitute low load conditions and high load conditions. Distinct operating modes are defined for each set of load conditions. Under low load conditions, a homogeneous mixture of main fuel and air is too lean to ensure stable combustion; consequently, the main fuel is injected at high pressure immediately following injection of the pilot fuel. Under high load conditions, fuel is injected in three stages. In the first stage, the main fuel is mixed with intake air prior to introduction into the combustion chamber or the main fuel is injected during the intake stroke or early in the compression stroke.

Selon l'invention, deux carburants différents sont injectés dans la chambre de combustion d'un moteur à combustion interne. Un carburant principal est allumé par un carburant pilote ayant un pouvoir d'auto-allumage supérieur au carburant principal. Selon ce procédé, des conditions de charge sur le moteur sont contrôlées et des ensembles de conditions sont définies afin de constituer des conditions de charge faible et des conditions de charge élevée. Des modes de fonctionnement distincts sont définis pour chaque ensemble de conditions de charge. Sous des conditions de charge faible, un mélange homogène d'air et de carburant principal est trop pauvre pour assurer une combustion stable, par conséquent, le carburant principal est injecté sous haute pression immédiatement après injection du carburant pilote. Sous des conditions de charge élevée, le carburant est injecté en trois étapes. Dans la première étape, le carburant principal est mélangé à de l'air d'admission avant introduction dans la chambre de combustion, ou le carburant principal est injecté durant l'admission ou au début de l'admission.

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