Avl List Gmbh

Hartmut Carstensen

Christian Beidl

Frank Mundorff

The invention relates to a four-stroke internal combustion engine with spark ignition and direct injection of the fuel into the combustion chamber, with a reciprocating piston for each cylinder and a roof-shaped top of the combustion chamber with at least one exhaust valve and at least two intake valves, as well as intake ports generating a tumble flow in the combustion chamber, as well as a fuel injection device opening into the combustion chamber, and an ignition source located in the area of the cylinder axis in the roof of the combustion chamber. In order to obtain good internal flow conditions the surface of the piston facing the combustion chamber is provided with a substantially Y-shaped configuration of flow guiding ribs, of which an arc-shaped rib is positioned approximately in the center of the piston and encloses a trough-shaped recess, and a longitudinal rib is provided on the side of the arc-shaped rib opposite of the recess, and the ignition source is positioned above the recess, and the fuel injection device is positioned in the area of the cylinder wall between the intake valves.

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Graz, Austria

Hartmut Carstensen