Daimler Ag

Robert Boschgmbh

Thomas Beckmann

Matthias Horn

Alexander Massner

Berthold Keppeler

Frank Duvinage

Siegfried Mueller

Tillmann Braun

Ortwin Balthes

Joachim Schommers

Antonio Pepe

Peter Raitschev

Bernhard Kobiela

Helmut Herwig

Peter Lueckert

Andreas Mueller

Siegfried MÜLLER

Peter LÜCKERT

An exhaust-gas purification system and method are provided for an internal combustion engine having an NOx storage catalytic converter and a downstream SCR catalytic converter. The NOx storage catalytic converter can be supplied in a first operating mode with an oxidizing exhaust gas and in a second operating mode with a reducing exhaust gas. A third operating mode is provided between the first operating mode and the second operating mode, in which an exhaust gas which has a lower content of oxidizing constituents than the first operating mode and a lower content of reducing constituents than the second operating mode can be supplied to the NOx storage catalytic converter to improve NHproduction at the start of converter regeneration.

Internal combustion engine with exhaust-gas purification system, and method for purifying the exhaust gas from an internal combustion engine

An exhaust gas system includes a reducing agent preparation section having a first cylindrical exhaust gas line pipe section opening approximately perpendicularly into a second exhaust gas line pipe section via an opening in a cylinder lateral surface of the second exhaust gas line pipe section. An injector unit for introducing the reducing agent into the exhaust gas is situated at the first exhaust gas line pipe section, upstream from the opening. The opening in the cylinder lateral surface of the second exhaust gas line pipe section has a larger extension in the direction of the longitudinal extent of the second exhaust gas line pipe section than transversely thereto. In a method using the reducing agent preparation section a rotating exhaust gas flow is formed within the second exhaust gas line pipe section.

Exhaust gas system of an internal combustion engine, and method for preparing a reducing agent which is introduced into the internal combustion engine exhaust gas

A method for operating a motor vehicle diesel engine having an exhaust emission control system is provided. The emission control system includes an oxidation catalytic converter, a particle filter, and an SCR catalytic converter, in which the exhaust gas that is discharged from the diesel engine is passed through the oxidation catalytic converter before passing through the particle filter and the SCR catalytic converter. A regeneration of the particle filter with thermal soot burn-off is occasionally carried out, during which the diesel engine is operated at an air-fuel ratio having a lambda value (&#x3bb;) of at least approximately 1.0, and air is added to the exhaust gas after it exits the oxidation catalytic converter and before it enters the particle filter air, so that soot deposited on the particle filter is burnt-off.

Method for operating a motor vehicle diesel engine

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Stuttgart, Germany

Thomas Beckmann