Patent ID: 7415965

Claim:
A method of injecting fuel into the combustion chamber of the cylinder of a direct-injection four-stroke internal-combustion engine, notably of diesel type, that can run according to a homogeneous combustion mode and according to a conventional combustion mode, wherein the combustion chamber of the cylinder is delimited on one side by the upper face of a piston comprising a concave bowl within which a generally teat of vertex angle (a 2 ) is arranged, comprising, for the conventional combustion mode of the engine, feeding into this chamber a first amount of fuel in the vicinity of the top dead centre of the piston at the beginning of the intake phase, wherein the first amount of fuel is fed for positions of the corresponding piston ranging from 0° to 50° crank angle, and another amount of fuel in the vicinity of the top dead centre of this piston at the end of the compression phase, wherein the fuel is fed from a fuel injection nozzle with a jet nappe angle (a 1 ) in degrees less than or equal to 2 ⁢ Arc ⁢ ⁢ tg ⁢ ⁢ CD 2 ⁢ F , where CD is the diameter of cylinder and F the distance between the point of origin of the fuel from the injection nozzle and the position of piston corresponding to a crank angle of 50° to the top dead centre.