Fuel system, especially of the common rail type, for an internal combustion engine

US7644699B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Jens Wolber · Gerlingen, DE
• Matthias Schumacher · Asperg, DE
• Oliver Albrecht · Bietigheim-Bissingen, DE
• Christian Koehler · Dresden, DE
• Christian Wiedmann · Redwood City, US
• Laurent Nack · Stuttgart, DE

Key dates

• Filing date: Nov 5, 2007
• Grant date: Jan 12, 2010
• Expiry date: Nov 5, 2027

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M37/10
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel system for an internal combustion engine includes at least one first fuel pump and a pressure region into which the fuel pump pumps and which communicates with an elastic volume reservoir. The elastic volume reservoir has a characteristic pressure/volume curve, which is defined by at least two points. It is proposed that a first point is defined by a first volume at a first pressure that is somewhat greater than a vapor pressure of the fuel at ambient temperature, and that a second point is defined by a second volume and a second pressure in the pressure region that corresponds to a maximum pressure; the difference between the first and second volumes corresponds at least approximately and at least to a value by which the volume of the fuel in the pressure region decreases upon cooling down from a maximum temperature to ambient temperature.