Fuel injection apparatus for internal combustion engines

US6651626B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Nestor Rodriguez-Amaya · Stuttgart, DE
• Roger Potschin · Brackenheim, DE
• Juergen Gruen · Walldürn, DE
• Ulrich Projahn · Graus, ES

Key dates

• Filing date: Mar 15, 2002
• Grant date: Nov 25, 2003
• Expiry date: Apr 30, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The fuel injection apparatus for internal combustion engines has one fuel pump for each cylinder of the engine, which pump has a pump piston, driven by the engine in a reciprocating motion, that defines a pump work chamber to which fuel is delivered from a fuel tank and which communicates with a fuel injection valve that has an injection valve member by which at least one injection opening is controlled and which is movable in an opening direction counter to a closing force by the pressure generated in the pump work chamber, by means of a first electrically controlled control valve, a communication of the pump work chamber with a diversion chamber is controlled, and by means of a second electrically controlled control valve, the pressure prevailing in a control pressure chamber of the fuel injection valve is controlled, by which the injection valve member is urged at least indirectly in the closing direction. The diversion chamber is a pressure reservoir, in which an elevated pressure, compared to the pressure prevailing in the fuel tank, is maintained.