Fuel injection system for an internal combustion engine

US6810857B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Peter Boehland · Erbach, DE
• Godehard Nentwig · Stuttgart, DE

Key dates

• Filing date: May 14, 2003
• Grant date: Nov 2, 2004
• Expiry date: May 14, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/46
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The fuel injection system has one high-pressure fuel pump and one fuel injection valve, communicating with it, for each cylinder of the engine. The fuel pump piston is driven in by the engine and defines a pump work chamber communicating with a pressure chamber of the fuel injection valve. The fuel injection valve has a first hollow injection valve member movable in an opening direction counter to a closing force by the pressure prevailing in the pressure chamber to control at least one first injection opening. A second injection valve member is guided displaceably inside the first injection valve member and is movable counter to a closing force in an opening direction by the pressure prevailing in the pressure chamber member to control at least one second injection opening. One face is associated respectively with the first injection valve member and the second injection valve member and is acted upon by the pressure prevailing in a fuel-filled pressure chamber.