Fuel injection valve having a mechanical positive-control valve gear

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 pre-injection and a main injection within a running injection cycle, wherein the main injection is divided into a first injection period during which the nozzle needle is opened at a first opening position and a second injection period following said first injection period during which the nozzle needle is opened at a second opening position, wherein the second opening position provides a greater opening than said first opening position.

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 the camshaft is driven by a drive system separate from the internal combustion engine, wherein the drive system is synchronized with the speed of the internal combustion engine to operate the fuel injection valve.

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 the 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 of the valve gear closes the needle nozzle between said pre-injection and said main injection.

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, wherein the 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 main injection respectively, wherein the profile of the valve gear closes the needle nozzle between the pre-injection and the main injection, wherein the fuel injection curve divides the main injection into a first injection period during which the nozzle needle is opened at a first opening position and a second injection period following said first injection period during which the nozzle needle is opened at a second opening position such that the second opening position provides a greater opening than the first opening position, wherein a fuel injection curve as a function of engine cycle depends upon the geometry of the mechanical positive-control valve gear;
• 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.