Method and device for operating an internal combustion engine

US7886712B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Dirk Hartmann · Aßling, DE
• Georg Mallebrein · Stuttgart, DE
• Werner Mezger · Weinsberg, DE
• Andreas Roth · Karlsruhe, DE
• Henri Barbier · Schwieberdingen, DE
• Nikolas Poertner · Stuttgart, DE
• Juergen Rappold · Beilstein, DE
• Ingo Fecht · Ludwigsburg, DE

Key dates

• Filing date: Feb 8, 2008
• Grant date: Feb 15, 2011
• Expiry date: Feb 8, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method and a device for operating an internal combustion engine make it possible to shift the combustion limit. In this context, a predefined output variable of the internal combustion engine such as the torque, for example, is realized in at least one operating state of the internal combustion engine by at least a retardation of an ignition angle. It is checked whether, due to the retardation of the ignition angle, a variable like, for example, a misfiring, characteristic for the combustibility of the air/fuel mixture in a combustion chamber of the internal combustion engine, exceeds a predefined limiting value in terms of a deterioration of the combustibility, and in this case, at least one actuator of the internal combustion engine, different from an actuator for setting the ignition angle, such as the exhaust-gas recirculation valve or EGR valve, for instance, is controlled along the lines of improving the combustibility of the air/fuel mixture.