Robert Boschgmbh

Marc Schott

Guido Porten

Markus Amler

Jens Wolber

Joerg Koenig

Matthias Walz

Pierre-Yves Crepin

Jan-Mathias Meng

Lu Chen

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

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

The aim of the invention is to optimize the running smoothness of an internal combustion engine. To achieve this aim, the individual cylinders are synchronized with respect to their torque contribution. According to the method, fuel is injected into the combustion chamber of a cylinder in at least one injection step, the at least one injection contributing to the torque of the internal combustion engine. Fuel is injected into the combustion chamber of the cylinder in a torque neutral manner by way of a secondary injection during a working stroke of the cylinder and the amount of fuel of the secondary injection us calculated in such a manner that the exhaust gas substantially corresponds to a stoichiometric air/fuel mixture.

Method for cylinder synchronization of an internal combustion engine

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Moeglingen, Germany

Marc Schott