Device and method for cylinder-torque equalization of an internal combustion engine, computer program, computer program product

US8505367B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Guido Porten · Wiernsheim, DE
• Lu Chen · Bietigheim-Bissingen, DE
• Marc Schott · Heubach, DE

Key dates

• Filing date: Dec 17, 2009
• Grant date: Aug 13, 2013
• Expiry date: Feb 17, 2030

Classification

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

Abstract

A device, a method, a computer program and a computer program product for diagnosing an internal combustion engine (100), in which a first cylinder (102) includes a combustion chamber (101), a fuel quantity and a fresh air quantity being supplied to the combustion chamber (101) for combustion; a torque contribution (D), generated by the combustion, of the first cylinder (102) in a first operating mode (B1) of the internal combustion engine (100) being a function of the fresh air quantity supplied, and in a second operating mode (B2) of the internal combustion engine (100) being essentially a function of the fuel quantity, wherein a first variable (L1) characterizing a smooth running of the internal combustion engine (100) in the first operating mode (B1) is ascertained, a second variable (L2) characterizing the smooth running of the internal combustion engine (100) in the second operating mode is ascertained, the first variable (L1) is compared to the second variable (L2), a diagnosis of the internal combustion engine (100) is made as a function of the result of the comparison.