Patent ID: 7406953

Claim:
A fuel injection system for an internal combustion engine, said system comprising: a fuel reservoir comprising fuel pressurized at a fluid pressure; a fuel injection valve, said valve comprising a nozzle needle, wherein the nozzle needle is opened and closed independent of the fuel fluid pressure; a lever selected from a tipping lever, a swing lever, a drag lever, and a key rod, wherein the lever is directly mechanically coupled to the nozzle needle; a mechanical positive-control valve gear selected from a three dimensional camshaft, a cam plate and a curve template, wherein the mechanical positive-control valve gear positively controls the nozzle needle by direct mechanical contact with the lever; and a camshaft coupled to the mechanical positive-control valve gear, wherein an axial shift of the camshaft provides for different opening characteristics of the nozzle needle, wherein a fuel injection curve as a function of engine cycle depends upon the geometry of the mechanical positive-control valve gear, wherein said mechanical positive-control valve gear comprises a profile that provides a plurality of distinct opening positions at different times to provide for a pre-injection and a main injection within a running injection cycle, wherein the profile comprises at least two recesses corresponding to the pre-injection and the main injection respectively.