Method of burning applied-ignition fuels in an air-compressing direct-injection internal combustion engine

Claim 1

A method of burning fuels ignited by applied-ignition in an air compressing direct injection internal combustion engine having a piston having a stroke volume with an upper dead center position and having a combustion chamber formed in said piston shaped in the form of a body of revolution including a wall and an edge as well as an upper end and a depth, which includes the steps of: starting a fuel injection cycle and spraying a free fuel current in a stream length directly onto a portion of the wall of said combustion chamber from a point substantially diametrically opposite thereof with the major portion of the fuel deposited on the combustion chamber wall in the form of a film, admitting air into said combustion chamber while imparting thereto a rotary movement to cause the air gradually to detach said film in the form of vapor from the combustion chamber wall and to intermix said air with said vapor, beginning the ignition near the combustion chamber edge at a location downstream in the direction of the rotary movement of said air where the free fuel current begins to traverse the combustion chamber and upstream in the direction of the rotary movement of said air where the fuel current impinges against the combustion chamber wall, selecting a fuel pressure level of the fuel current injection so that the rate of fuel injection into the cylinder lies between 0.7 and 1.3 cubic millimeters per degree angle times liter stroke volume and the fuel impingement point at the starting of the fuel injection cycle is substantially even with the upper end of the combustion chamber wall, and in the upper dead center position of the piston the fuel impingement point lies near the lower end of the combustion chamber wall near the combustion chamber bottom with the fuel impingement point traversing nearly the entire depth of the combustion chamber on the combustion chamber wall.

Claim 2

A method of burning fuels ignited by applied-ignition in an air compressing direct injection internal combustion engine having a piston having a stroke volume with an upper dead center position and having a combustion chamber formed in said piston shaped in the form of a body of revolution including a wall and an edge as well as an upper end and a depth, which includes the steps of: starting a fuel injection cycle and spraying a free fuel current in a stream length directly onto a portion of the wall of said combustion chamber from a point substantially diametrically opposite thereof with the major portion of the fuel deposited on the combustion chamber wall in the form of a film, admitting air into said combustion chamber while imparting thereto a rotary movement to cause the air gradually to detach said film in the form of vapor from the combustion chamber wall and to intermix said air with said vapor, beginning the ignition near the combustion chamber edge at a location downstream in the direction of the rotary movement of said air where the free fuel current begins to traverse the combustion chamber and upstream in the direction of the rotary movement of said air where the fuel current impinges against the combustion chamber wall, selecting a fuel pressure level of the fuel current injection so that the rate of fuel injection into the cylinder lies between 0.7 and 1.3 cubic millimeters per degree angle times liter stroke volume and the fuel impingement point at the starting of the fuel injection cycle is substantially even with the upper end of the combustion chamber wall, and in the upper dead center position of the piston the fuel impingement point lies near the lower end of the combustion chamber wall near the combustion chamber bottom with the fuel impingement point traversing nearly the entire depth of the combustion chamber on the combustion chamber wall.