Mtu Motoren-und Turbinen-union Friedrichshafen Gmbh

Guenther Schmidt

Joerg Matthies

The invention relates to a fuel-injection system for an internal combustion engine. The fuel-injection system contains a number of fuel injectors which are supplied with fuel by a high-pressure pump via a common inlet pipe and high-pressure lines leading from said pump to the individual fuel injectors. High-pressure storage devices are provided in each of the high-pressure lines in each of the high-pressure lines, the fuel storage volumes of said high-pressure storage devices being between 80 and 300 times, preferably between 120 and 200 times the maximum injection quantity per injection action. The diameter D,of the high-pressure lines leading from the common inlet pipe to the high-pressure storage devices is measured to minimize the difference in the quantities of fuel injected by the fuel injectors.

Fuel-injection system for an internal combustion engine

An arrangement limits a fuel supply from a fuel pressure reservoir by way of a controllable injection valve into the combustion space of an internal-combustion engine. The fuel flow is interrupted as a function of the forces applied to a spring-prestressed valve separating piston in the event of an outlet-side pressure drop. A reliable limiting of the maximal injected fuel quantity is achieved by providing a flow-through opening penetrating the separating piston with a closing device. This flow-through opening can be closed as a function of the displacing direction of the separating piston. If the displacing device closes the flow-through opening in the starting position, during the injection phase and in the piston end position, the limiting valve will continuously interrupt the fuel flow in the case of an outlet-side pressure drop. Alternatively, the flow-through opening is such that a fuel filter cartridge can be inserted into the separating piston, through which fuel, which was apportioned between two respective injection phases, flows during the restoring stroke.

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Meckenbeuren, Germany

Guenther Schmidt