Patent ID: 7431012

Claim:
A combustion system for an internal combustion engine, comprising: a cylinder; a cylinder head; a fuel injector having a nozzle mounted within said cylinder head, with said fuel injection nozzle being configured to spray fuel at a predetermined spray angle; and a piston slidingly housed within said cylinder, with said piston having a bowl formed in a crown portion thereof and defining a combustion chamber with the cylinder head, with said bowl comprising: a floor with a depressed periphery and a raised center section, with said bowl floor having a midland portion which is impinged upon by fuel spraying from said nozzle, and with said bowl having a peripheral exit portion with an exit angle which is greater than 90°, such that burning fuel from said injector first impinges upon said midland portion of the bowl floor and then flows past the outer periphery of the bowl before recirculating to a middle region of the combustion chamber, defined by the bowl, for further burning, wherein substantially all of the fuel injected during a single combustion event burns during a single toroidal pass through the combustion chamber, beginning with the impingement of sprayed fuel upon the midland portion of the bowl floor and continuing during and after transport of partially burned fuel into the middle region of the combustion chamber.