Fuel injection device for an internal combustion engine

US6889658B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Joachim Winter · Ditzingen, DE
• Gerhard Mack · Bad Rodach, DE
• Christoph Buehler · Gerlingen, DE
• Friedrich Moser · Magstadt, DE
• Thomas Kuegler · Ditzingen, DE
• Philippe Allio · Miribel, FR
• Peter Boehland · Erbach, DE
• Detlev Potz · Stuttgart, DE

Key dates

• Filing date: Aug 23, 2002
• Grant date: May 10, 2005
• Expiry date: Sep 1, 2022

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 (10) with a pump work chamber (22) and one fuel injection valve (12), communicating with the pump work chamber, for each cylinder of the engine. The fuel injection valve (12) has a first injection valve member (28), by which at least a first injection opening (32) is controlled, and which is movable in an opening direction (29) counter to a closing force by the pressure generated in the pump work chamber (22). Inside the hollow first injection valve member (28), a second injection valve member (128) is guided displaceably, by which at least a second injection opening (132) is controlled, and which is movable by the pressure prevailing in the pressure chamber (40) in an opening direction (29) counter to a closing force; the second injection valve member (128) is acted upon at least indirectly by the pressure prevailing in a fuel-filled control chamber (50), which pressure is generated, as a function of operating parameters of the engine, by a feed pump (52) such that the second injection valve member (128) either remains in its closed position, or can open.