Fuel injection system for an internal combustion engine

US6796290B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

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

Key dates

• Filing date: Dec 2, 2002
• Grant date: Sep 28, 2004
• Expiry date: Mar 4, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M63/0007
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection system having a high-pressure fuel pump and a fuel injection valve for each engine cylinder. A pump work chamber can be made to communicate with a pressure chamber of the injection valve having a valve member movable by pressure in the pressure chamber to control opening of at least one injection opening. A connection of the pump with a relief chamber is controlled by a first electrically actuated control valve, and a second control valve controls the pressure in a control pressure chamber, which pressure urges the injection valve in the closing direction. A blocking valve is disposed in the connection of the pump with the pressure chamber, and the connection of the pump with the relief chamber, in which the first control valve is disposed, leads away between the pump and the blocking valve.