Daimler Ag

Cyrill Kammer

Berthold Keppeler

Markus Paule

Jochen Lahr

Anke Traebert

Nicole Werquet

Axel Zuschlag

In a method for reducing the emission of nitrogen dioxide in a motor vehicle having an exhaust gas purification system having an SCR catalytic converter with adsorption centers for nitrogen oxides, an exhaust gas enriched with ammonia is supplied to the SCR catalytic converter above an operating temperature. Below the operating temperature, the exhaust gas supplied to the SCR catalytic converter is enriched with a material such that an adsorption of nitrogen oxides is inhibited at corresponding adsorption centers of the SCR catalytic converter. In order to reduce the overall NOemissions below a first, predeterminable amount, an exhaust gas enriched with ammonia is supplied to the SCR catalytic converter and the NOportion of the total NOemissions is reduced below a second, predeterminable amount in that NOis converted with hydrocarbons stored in the SCR catalytic converter.

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Bad Urach, Germany

Cyrill Kammer