Fuel injection system

US6655355B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Martin Kropp · Ditzingen, DE
• Hans-Christoph Magel · Pfullingen, DE

Key dates

• Filing date: Dec 28, 2001
• Grant date: Dec 2, 2003
• Expiry date: Jan 24, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M61/205
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a pressure-controlled fuel injection system, a nozzle needle is subjected to pressure in the closing direction by a nozzle spring. A nozzle chamber for opening the nozzle needle is connectable to a pressure reservoir via a pressure line. A hydraulic device is embodied to reinforce the closing performance of the nozzle needle. As a result, a faster closing performance of the nozzle needle is achieved.