Method and device for monitoring a fuel injection device for an internal combustion engine

US7779678B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Jens Wolber · Gerlingen, DE
• Oliver Wiemers · Stuttgart, DE
• Winfried Langer · Schützingen, DE
• Andreas Baumann · Münsingen, CH
• Christian Koehler · Dresden, DE
• Norbert Mueller · Ostseebad Nienhagen, DE
• Hans-Juergen Baehr · Großenhain, DE
• Matthias Walz · Lambach, DE

Key dates

• Filing date: Feb 16, 2006
• Grant date: Aug 24, 2010
• Expiry date: Sep 17, 2026

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2200/1015
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a method and a device for operating an injection device (5) for an internal combustion engine, the injection device (5) includes injection valves (40), via which fuel is injected directly into combustion chambers (100) of the internal combustion engine. Mechanisms are provided for detecting misfirings (310), and for determining a fuel pressure (320). A mechanical fault of an injection valve (40) is detected when a misfire occurs in a cylinder (110) and the fuel pressure simultaneously drops below a threshold value (SW). An electrical fault in an injection device (5) is detected when misfirings of cylinders (110) assigned to an output stage bank of the injection device (5) are observed, and the fuel pressure has dropped below a threshold value (SW). The responses to the faults that are implemented differ depending on the faults that were detected.