Combustion process for direct injected spark ignition combustion engine

The combustion stage in the Otto cycle of an internal combustion motor, with direct fuel injection, has the fuel injected into the cylinder (1) in a double-cone spray formation (2) from a multi-jet fuel injector (7). The fuel spray at the jet side is at an angle of 35-55 degrees in the upper partially-loaded part of the cylinder and then at a sharp angle into the piston head trough (3), when the motor (1') is in a lean running mode. The major portion of the fuel remains as a cloud within the piston head trough, with a piston setting of 90-35 degrees , and a portion is thrown back through the spray pulse. The fuel at the trough is moved towards the ignition (6) to prevent trough wall deposits, while a twisting stream of combustion air is directed at the piston head trough with a twist of ≤ 2.5.