Daimler Chrysler Ag

Gerhard K&ouml;nig

Alois Raab

Gregor Renner

Rainer Werner Jorach

Eckart Schloz

Heinz &Ouml;ing

Petra Stapf

In a method for the injection of Diesel fuel into a combustion chamber of a Diesel engine by way of a fuel injection valve with a plurality of pilot and main fuel injection ports, the fuel is injected during partial load operation only by way of the pilot injection ports such that a homogeneous mixture is formed and, under full load operation, fuel is additionally injected&mdash;after a pause&mdash;through the main fuel injection ports in such a way that a fuel jet bundle is formed in combination with the fuel jets formed by the pilot ports which is extends over the whole periphery of the combustion chamber. The fuel injection valve has the main fuel ports arranged in a piezo-actuated tappet in series in the direction of the opening movement of the tappet behind the associated pilot ports. With the piezo drive the opening stroke of the tappet can be controlled so as to provide fuel injection pauses between the pilot fuel injection and the main fuel injection.

Method for the injection of fuel

A method for operating a reciprocating-piston internal combustion engine with direct fuel injection. Injecting fuel in a lower part-load range, for the formation of a heterogeneous mixture, with a higher injection pressure centrally into a working space or a piston recess shortly before top dead center, or, optionally, in the case of very early injection (crank angle of 180&deg; to 20&deg; before top dead center), forming locally an ignitable homogeneous mixture with homogeneous combustion by defined charge stratification, controlled air movement in the cylinder and injection pressure combined with timed injection; injecting fuel in a middle part-load range, for a formation of a homogeneous mixture, with a lower injection pressure in a phase with a crank angle of 180&deg; to 20&deg; before top dead center; and injecting part of the fuel, in an upper part-load range ( ) and/or full-load range, first, for the formation of a homogeneous mixture, with a lower injection pressure into the working space or the piston recess in a phase with a crank angle of 180&deg; to 20&deg; before top dead center and, injecting the rest of the fuel, for the formation of a heterogeneous mixture, with a higher injection pressure into the working space or the piston recess in a phase around top dead center.

Method for operating a reciprocating-piston internal combustion engine

Growing community of inventors

Lauterstein, Germany

Gerhard König

Growing community of inventors

Lauterstein, Germany

Gerhard K&ouml;nig

Gerhard König