Fuel injection method and system for an internal combustion engine

US6536416B1 · kind B1 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Bernd Mahr · Plochingen, DE
• Martin Kropp · Ditzingen, DE
• Hans-Christoph Magel · Pfullingen, DE
• Wolfgang Otterbach · Stuttgart, DE

Key dates

• Filing date: Aug 21, 2000
• Grant date: Mar 25, 2003
• Expiry date: Jan 5, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method and system for injecting fuel in at least two different high fuel pressures via injectors into a combustion chamber of an internal combustion engine. The higher fuel pressure being stored in a central pressure reservoir, the lower fuel pressure is generated individually locally for each injector, at all times during the injection event by diversion of the higher fuel pressure. The diversion being activatable or deactivatable via a multi-way valve. To that end, a corresponding fuel injection system with a central pressure reservoir for storing the higher fuel pressure has a local diversion unit for each injector by means of which the lower fuel pressure can be generated dissipatively from the higher fuel pressure, and the local diversion unit has a multi-way valve for activating and deactivating the diversion, respectively. In this way, an improved metering of the lower fuel pressure can be achieved.