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AssigneeInstitut Francais du Petrole
InventorsBertrand Gatellier, Bruno Walter
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A direct-injection internal-combustion engine comprising at least one cylinder (1) with a cylinder head (2), a piston (5) sliding in the at least one cylinder, a gas intake and exhaust (3, 4), a combustion chamber defined on one side by the upper face (SP) of the piston (5), the face comprising a projection (7) pointing towards cylinder head (2) and arranged at the center of a concave bowl (8). According to the invention, engine comprises at least one injection nozzle (6) for injecting fuel with a nappe angle (a1) less than or equal to 2Arctg2FCD, where CD is the diameter of cylinder (2) and F the distance between the point of origin of the fuel jets from injection nozzle (6) and the position of the piston corresponding to a crankshaft angle of 50° in relation to the top dead center (TDC).
A direct-injection internal-combustion engine comprising at least one cylinder (1) with a cylinder head (2), a piston (5) sliding in this cylinder, gas intake and exhaust means (3, 4), a combustion chamber delimited on one side by upper face (SP) of piston (5) comprising a teat (7) pointing towards cylinder head (2) and arranged at the center of a concave bowl (8), characterized in that it comprises at least one injection nozzle (6) for injecting fuel with a nappe angle (a1) less than or equal to
An engine as claimed in any one of the previous claims, characterized in that the height of teat (7) is greater than at least 40% of the depth of bowl (8).
An engine as claimed in any one of the previous claims, characterized in that the fuel jets from injection nozzle (6) form an intersection angle (a5) of the order of 5° with flank (11) of teat (7).
A process for improving the latitude of operation of a direct-injection internal-combustion engine comprising at least one cylinder (1), a piston (5) sliding in this cylinder, gas intake and exhaust means (3, 4), a combustion chamber delimited on one side by the upper face of piston (5) comprising a teat (7) pointing towards cylinder head (2), at the center of a cup or bowl (8), characterized in that it consists in injecting the fuel into each cylinder through an injection nozzle having a nappe angle (a1) less than or equal to
A process for improving the latitude of operation of a direct-injection internal-combustion engine comprising at least one cylinder (1), a piston (5) sliding in this cylinder, gas intake and exhaust means (3, 4), a combustion chamber delimited on one side by the upper face of piston (5) comprising a teat (7) pointing towards cylinder head (2), at the center of a cup or bowl (8), characterized in that it consists:
Dependencies are inferred from the claim text.