Patent ID: 7073478

Claim:
An internal combustion engine with auto ignition having a cylinder, with a cylinder head and a piston having a piston trough with a trough edge area, and a combustion chamber defined by the cylinder head and the piston, and a fuel injection device for injecting fuel directly into the combustion chamber, so that at least some of the fuel enters the piston trough, and at least one recess formed in the cylinder head surface above the trough edge area remote from the center of the combustion chamber such that some of the fuel injected into the combustion chamber and the piston trough is deflected from the trough edge area toward the cylinder head and collected in the at least one recess formed in the cylinder head, whereby, in a squish, flow of compressed air forced at the end of the compression stroke of the piston from a circumferential combustion chamber area toward the center of the combustion chamber, turbulence is generated upon passing the at least one recess such that the compressed air in the squish flow is homogeneously mixed with the fuel collected in the at least one recess.