Fuel injection device for an internal combustion engine

US6540160B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

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

Key dates

• Filing date: May 17, 2002
• Grant date: Apr 1, 2003
• Expiry date: May 17, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/703
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection device having a fuel pump for each cylinder of an internal combustion engine, which fuel pump has a pump piston that is driven into a stroke motion by the engine and delimits a pump working chamber, which is supplied with fuel from a fuel tank and is connected to a fuel injection valve, which has an injection valve member that controls at least one injection opening and can be moved by the pressure generated in the pump working chamber in an opening direction counter to a closing force. A first electrically controlled control valve controls a connection of the pump working chamber to a discharge chamber, and a second electrically controlled control valve controls the pressure prevailing in a control pressure chamber of the fuel injection valve, which pressure acts on the injection valve member in the closing direction. A third electrically controlled control valve controls an additional connection of the pump working chamber to the discharge chamber; this connection contains a pressure control valve that opens toward the discharge chamber.