Volkswagen Ag

Emitec Gesellschaft Fuer Emissionstechnologie Mbh

Continental Automotive Gmbh

Emitec Gesellschaft Fur Emissionstechnologie Mbh

Thorsten Düsterdiek

Jan Hodgson

Sven Schepers

Carsten Kruse

Thomas Nagel

Giampaolo Nigro

Martina Kösters

Gerhard Kahmann

Richard Dorenkamp

The invention relates to an SCR catalytic convertor system and a method for operating a reductant metering process of an SCR catalytic converter system () of an internal combustion engine (), wherein the SCR catalytic converter system () has a first SCR exhaust emission control device (), an SCR catalytic converter () arranged downstream of the SCR exhaust emission control device, and a reductant metering device () for metering a reductant into the exhaust gas flow upstream of the first SCR exhaust emission control device (), wherein the reductant metering process is controlled at least depending on a temperature of the first SCR exhaust emission control device () and of the SCR catalytic converter () arranged downstream, wherein (I) if the temperature of the first SCR exhaust emission control device () is greater than or equal to a predetermined minimum temperature (T_SPF min) and the SCR catalytic converter () arranged downstream is less than a predetermined minimum temperature (T_SCR min), the reductant metering process occurs in a first operating mode in such a way that a reductant filling level (NH3_SPF) of the first SCR exhaust emission control device () is less than the maximum reductant filling level (NH3_SPF_max) of the first SCR exhaust emission control device, and (II) if the temperature of the SCR catalytic converter () arranged downstream is greater than or equal to the minimum temperature (T_SCR min) of the SCR catalytic converter arranged downstream, the reductant metering process occurs at least at times in a second operating mode in such a way that the reductant filling level (NH3_SPF) of the first SCR exhaust emission control device () is greater than the maximum reductant filling level (NH3_SPF_max) of the first SCR exhaust emission control device, such that a reductant penetration passing through the first SCR exhaust emission control device () hits the SCR catalytic converter () arranged downstream.

Method for operating a reductant metering process of an SCR catalytic converter system, and corresponding SCR catalytic converter system

A method for operating a device for the purification of exhaust gas of an internal combustion engine which is operated with an excess of air includes heating at least one heating apparatus of the device above a predetermined first setpoint temperature. The at least one heating apparatus is at least partially in contact with the exhaust gas, can be activated by electrical energy and is formed at least partially with an oxidation coating. At least the temperature of the at least one heating apparatus or of the exhaust gas is subsequently monitored. An increase in the hydrocarbon fraction of the exhaust gas is initiated if at least the temperature of the heating apparatus or of the exhaust gas has reached a threshold temperature or a low-load phase of the internal combustion engine is present. A motor vehicle having the device is also provided.

Method for operating an exhaust gas purification device having a heating apparatus and motor vehicle having the device

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Hannover, Germany

Thorsten Düsterdiek