Fuel injection pump for internal combustion engines, in particular diesel engines

US5072706A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ewald Eblen · Stuttgart, DE
• Karl Hofmann · Neckarrems, DE
• Alfred Schmitt · Ditzingen, DE
• Max Straubel · Stuttgart, DE
• Hung Truong-Canh · Stuttgart, DE

Key dates

• Filing date: Jun 22, 1990
• Grant date: Dec 17, 1991
• Expiry date: Jun 22, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection arrangement for internal combustion engines, particularly for diesel engines, is indicated, in which the fuel injection is divided into an advance injection and a main injection for the purpose of noise reduction. An advance injection unit (27) is provided for the purpose of proportioning the advance injection quantity and a fuel injection pump of a conventional construction is provided for proportioning the main injection quantity. For an optimal design of the advance injection quantity with respect to noise reduction without influencing the main injection quantity, the advance injection unit (27) comprises a high-pressure storage (28), which is compressed to injection pressure, and at least one solenoid valve (30), which is controlled with respect to time. The advance and main injections are preferably effected via separate nozzle cross sections (21, 22).