Fuel injection device for an internal combustion engine

US6953157B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Peter Boehland · Erbach, DE
• Michael Kurrle · Wissen, DE
• Joerg Fischer · Munich, DE

Key dates

• Filing date: Nov 12, 2002
• Grant date: Oct 11, 2005
• Expiry date: Dec 28, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/28
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The fuel injection system having one high-pressure fuel pump and one fuel injection valve for each engine cylinder in which the pump piston defines a work chamber, which communicates with a pressure chamber of the fuel injection valve. A control valve controls connection of the pump work chamber with a relief chamber and having a second control valve controls a connection of a control pressure chamber, which communicates with the pump work chamber defined by a control piston with a relief chamber is controlled, and in which connection a throttle restriction is provided. A flow cross section of the connection of the control pressure chamber with the relief chamber is controlled as a function of the stroke of the control piston, such that with an increasing opening stroke of the injection valve member, a smaller flow cross section is uncovered by the control piston and at the maximum opening stroke of the injection valve member, the uncovered flow cross section is smaller than the flow cross section of the second throttle restriction.