Daimler Chrysler Ag

Daimler Ag

Norbert Ruzicka

Thomas Liebscher

Michael Lenz

Holger Adler

Ulrich Merten

Stefan Kurze

Bernd Krutzsch

Markus Paule

Walter Boegner

Michel Weibel

Andreas Hertzberg

Arno Nolte

Nicholas Fekete

Hans-Hubert Hemberger

Anton Kerckhoff

Joachim Schommers

Dirk Voigtl&auml;nder

Klaus Allmendinger

G&uuml;nter Wenninger

Christof Sch&ouml;n

Dirk Becker

Oliver Erlenmayer

Andreas Hasert

Frank Duvinags

Andreas Roll

Sven Pfoertsch

Kirsten Hardenberg

Doris Schr&ouml;der

G&uuml;nter Karl

Renate Marx

In a method for operating an exhaust-gas cleaning unit of a diesel engine including a particle filter and a nitrogen oxide storage device arranged upstream of the particle filter, wherein sulfur regeneration of the nitrogen oxide storage device is performed periodically at raised exhaust gas temperatures and, in certain phases, with a rich exhaust gas composition, and also soot regeneration of the particle filter is performed at raised exhaust gas temperatures with a lean exhaust gas composition, at least some of the sulfur regeneration and the soot regeneration phases are performed in a combined soot and sulfur regeneration phase, and for the sulfur regeneration, at least temporarily, a rich exhaust-gas composition with a temperature higher than the temperature of the lean exhaust gas composition is provided for the soot regeneration of the particle filter.

Method of operating an exhaust gas cleaning unit with particle filter and nitrogen oxygen store

The invention relates to a method for operating a diesel engine in which an air ratio (&#x3bb;) of the fuel which is to be burnt and of the combustion air supplied is set by a control unit () according to predetermined values. When a value () which is predetermined as a switching criterion is recorded, the control unit () switches to a special operating mode for regeneration of a catalytic converter () and sets the fuel/air ratio according to predetermined values for this operating mode. To achieve more effective regeneration of the catalytic converter, according to the invention it is provided that at least one afterinjection, which is separated in time from a main injection, of fuel which is also to be burnt takes place in the special operating mode.

Method for operating a diesel engine

In a method for operating a diesel engine and a diesel engine, wherein engine emission control is provided by switching between a lean mode with superstoichiometric combustion air ratio &#x3bb;&#x3e;1 and a rich mode with substoichiometric combustion air ratio &#x3bb;&#x3c;1, the engine-torque fluctuations during the switching are determined and engine parameters which influence the engine torque, are adjusted so as to keep the engine torque constant during the switchover.

Method for operating a diesel engine, and diesel engine

A method for the desulfurization of a nitrogen oxide adsorber of an exhaust gas purification device for a combustion system employs desulfurization phases that are intermittently implemented by a desulfurization control unit. During each desulfurization phase, the carbon monoxide concentration and/or the lambda value of the exhaust gas stream exiting the nitrogen oxide adsorber is recorded. A localized maximum that appears in the recorded course of the carbon monoxide concentration over time, or a downward slope that appears in the established course of the lambda value over time, falling from a temporary plateau value, is employed as criterion for terminating the desulfurization phase. The method may be used, for example, in exhaust gas purification devices in primarily lean-burning vehicle combustion engines.

Method and apparatus for desulfurizing a nitrogen oxide adsorber

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Steinenbronn, Germany

Norbert Ruzicka