Patent ID: 8511271

Claim:
An internal combustion engine comprising: at least one cylinder, in which a combustion chamber is delimited between a piston and a cylinder head, a fuel injector arranged in the cylinder head and having an injection nozzle with a plurality of injection bores, and a piston depression arranged in the piston and having a compression projection, with a projection cone angle, positioned in the piston depression opposite the injection nozzle, wherein the injection bores are formed such that, during fuel injection which takes place in a range from 20° CA before top dead center to 35° after top dead center, fuel jets emerging from the injection bores with a fuel cone angle impinge on the piston depression, wherein, to impede soot particle formation, the injection bores and the compression projection are formed such that a generated ratio β/α of fuel cone angle β to projection cone angle α is in a range of from 1.15 to 1.3, wherein said piston depression has a piston depression contour with a depression base radius RK between a depression base and a depression edge, wherein said depression base radius RK has a radius center disposed outside of the piston depression, and wherein a ratio RK/DM of the depression base radius RK to a maximum depression diameter DM of said piston depression is in a range of from 0.1 to 0.35 so as to further impede soot particle formation, the piston depression having a rounded-off transition to a flat piston head surface in an edge region of the piston depression.