Fuel injection system

US3946714A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Konrad Eckert · Stuttgart, DE
• Gerhard Stumpp · Stuttgart, DE

Key dates

• Filing date: Mar 13, 1975
• Grant date: Mar 30, 1976
• Expiry date: Mar 13, 1995

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M69/22
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection system for externally ignited internal combustion engines including fuel injection nozzles, a fuel distributor unit, a fuel supply circuit, and a control pressure circuit. The distributor unit includes metering valves, pressure valves and a first throttle which separates the fuel supply circuit from the control pressure circuit. At least one of the pressure valves is embodied as a differential pressure control valve which has one chamber connected to the first throttle and the control pressure circuit. The control pressure circuit includes the above-mentioned chamber of the differential pressure control valve, a magnetic valve, a storage element and a second throttle. With the system noted, the pressure difference across the metering valves may be varied by varying the pressure difference across the first throttle by means of the magnetic valve via the storage element and the second throttle.