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Bayerische Motoren Werke Aktiengesellschaft

Dr. Ing. H.c. F. Porsche Aktiengesellschaft

Audi Ag

Volkswagen Ag

Daimler Chrysler Ag

Stefan Wessels

Christian Goerigk

Michael Illek

Jens Mueller

Paul Kueper

Stefan Peter

An exhaust-gas cleaning system includes a nitrogen oxide reduction catalytic converter for reducing nitrogen oxides which are contained in the exhaust gas. A reducing agent is introduced into the exhaust-gas flow and is in the form of a vapor. A reducing-agent metering device for the metered addition of the reducing agent or a reducing-agent precursor to the exhaust-gas flow includes a vaporizer, which is arranged in the exhaust system upstream of the nitrogen oxide reduction catalytic converter. As a heat source, the vaporizer has (1) a heatable deflector surface, onto which the reducing agent, which is supplied by a feed unit, is directed under pressure; or (2) a microwave generator.

Exhaust-gas cleaning system with nitrogen oxide reduction and with the addition of reducing agent

The present invention concerns a method and a system for feeding a reducing agent into a catalyst device. A first reservoir is provided and has a solid reducing agent, a second reservoir is provided and has a solvent for the solid reducing agent, and a reducing agent solutions is produced from the solid reducing agent and the solvent. The reducing agent solution is intermittently stored in a third reservoir, and the reducing agent solution is fed from the third reservoir into the catalyst device.

Method and system for feeding a reducing agent into a catalyst device

A process for monitoring the operation of a system for the aftertreatment of exhaust gas utilizes respective temperature sensors assigned to catalysts in the exhaust gas system. In addition, a sensor for detecting the NOx content in the exhaust gas is assigned to a reduction catalyst. The detected values, or functions thereof, are in each case compared with the definable reference values and when these definable limit values are exceeded, a corresponding defect information is triggered.

Process for monitoring operation of an exhaust gas treatment system

Growing community of inventors

Weissach-Flacht, Germany

Stefan Wessels