Abstract: A regeneration method (10) for regenerating an adsorber (19), connected downstream of an internal combustion engine (13), of a motor vehicle (11) with a hybrid drive train is described. The internal combustion engine (13) is operated in a phase of rich combustion for regeneration of the adsorber (19). According to the description, an engine load (30) and/or an engine rotational speed (31) of the internal combustion engine (13) for the rich combustion is influenced by means of an electric machine (14) which can be coupled mechanically to the internal combustion engine (13).

Abstract: A method, comprising purging a storage catalytic converter of stored NOx by diverting only a portion of incoming exhaust flow around the catalytic device while increasing injection of reductant to the storage catalytic converter; and responsive to the diverting, adjusting injection of an ammonia-containing fluid into recombined exhaust flow upstream of an SCR catalytic converter. Bypass of the storage catalytic converter reduces available oxygen and air flow through the storage catalytic converter, providing a more advantageous environment for reduction of NOx in the storage catalytic converter.

Abstract: An exhaust-gas aftertreatment system (1) for a motor vehicle having a turbocharged internal combustion engine (2) comprises a large-volume lean NOx trap (5) which is connected by means of a short connecting pipe (4) to an outlet of the turbocharger (3), wherein the lean NOx trap (5) has a first region (6) for the storage and/or reduction of NOx and oxidation of NO to form NO2 and/or reduction of hydrocarbon and/or carbon monoxide in the exhaust gas, and a downstream second region (7) for the storage and/or reduction of nitrogen oxides in the exhaust gas.

Abstract: A method for operating an exhaust-gas aftertreatment system arrangement is provided. The method includes in a first operating state, flowing a substantial majority of an exhaust-gas stream from the internal combustion engine through a first NOx storage catalytic converter positioned in a main exhaust branch of an exhaust aftertreatment system arrangement and in a second operating state, flowing a substantial majority of the exhaust-gas stream through a first bypass branch branching off from the main exhaust branch upstream of the first NOx storage catalytic converter and which opens into the main exhaust branch downstream of the first NOx storage catalytic converter and regenerating the first NOx storage catalytic converter.

Abstract: Embodiments for reducing ammonia slip are provided. In one example, a method for reduction of ammonia emissions from an engine exhaust gas aftertreatment device with an SCR catalyst comprises determining a concentration of NOx and/or ammonia in the exhaust gas aftertreatment device, comparing a determined value of NOx and/or ammonia concentration with a nominal value for NOx and ammonia, respectively, and if an actual or shortly forecasted ammonia concentration is above the respective nominal value, triggering engine conditions with higher exhaust NOx concentration. In this way, ammonia slip may be reduced without degrading fuel economy.

Abstract: A regeneration method (10) for regenerating an adsorber (19), connected downstream of an internal combustion engine (13), of a motor vehicle (11) with a hybrid drive train is described. The internal combustion engine (13) is operated in a phase of rich combustion for regeneration of the adsorber (19). According to the description, an engine load (30) and/or an engine rotational speed (31) of the internal combustion engine (13) for the rich combustion is influenced by means of an electric machine (14) which can be coupled mechanically to the internal combustion engine (13).

Abstract: A method for operating an internal combustion engine having a lean NOx trap connected downstream is provided. The method comprises in a normal operating mode, operating the internal combustion engine with a lean fuel/air mixture, and in a special operating mode, operating the internal combustion engine with a rich fuel/air mixture in order to bring about regeneration of the lean NOx trap, wherein a changeover from the normal operating mode to the special operating mode takes place when switching off of the internal combustion engine is expected.

Abstract: The present disclosure relates to a method for controlling an injection device for feeding an ammonia-releasing reducing agent into an exhaust-gas purification system of an internal combustion engine for the purpose of reducing the nitrogen oxide emissions, wherein the exhaust-gas purification system comprises at least one SCR catalytic converter with n cells which are arranged in series in the exhaust-gas throughflow direction and in which ammonia can be stored.

Abstract: An exhaust-gas aftertreatment system (1) for a motor vehicle having a turbocharged internal combustion engine (2) comprises a large-volume lean NOx trap (5) which is connected by means of a short connecting pipe (4) to an outlet of the turbocharger (3), wherein the lean NOx trap (5) has a first region (6) for the storage and/or reduction of NOx and oxidation of NO to form NO2 and/or reduction of hydrocarbon and/or carbon monoxide in the exhaust gas, and a downstream second region (7) for the storage and/or reduction of nitrogen oxides in the exhaust gas.

Abstract: A method for regenerating a particulate filter is disclosed. In one example, oxygen is pumped from the intake system of a direct injection turobocharged gasoline engine through a cylinder and into the exhaust system by a compressor. In this way, regeneration of a particulate filter may be accomplished without an auxiliary air supply.

Abstract: A system for regenerating a particulate filter is disclosed. In one example, oxygen is pumped from the intake system of a direct injection turbocharged gasoline engine to the exhaust system by a compressor. Simultaneously, exhaust gases may be pumped from the exhaust system to the intake system for the purpose of reducing NOx while regenerating a particulate filter.

Abstract: A method for regenerating a particulate filter is disclosed. In one example, oxygen is pumped from the intake system of a direct injection turbocharged gasoline engine to the exhaust system by a compressor. The oxygen is introduced to a particulate filter at a location upstream from the particulate filter and downstream of a three-way catalyst. The oxygen may be regulated in part by adjusting compressor boost pressure in response to a state of particulate filter regeneration. Further, in one embodiment, engine NOx can be controlled by EGR.

Abstract: A method for regenerating a particulate filter is disclosed. In one example, oxygen is pumped from the intake system of a direct injection turobocharged gasoline engine to the exhaust system by a compressor. The oxygen is introduced to a particulate filter at a location upstream from the particulate filter. In this way, regeneration of a particulate filter may be accomplished without disturbing the chemistry of a three-way catalyst located in the exhaust system upstream of the particulate filter.

Abstract: Embodiments for reducing ammonia slip are provided. In one example, a method for reduction of ammonia emissions from an engine exhaust gas aftertreatment device with an SCR catalyst comprises determining a concentration of NOx and/or ammonia in the exhaust gas aftertreatment device, comparing a determined value of NOx and/or ammonia concentration with a nominal value for ammonia and NOx, respectively, and if an actual or shortly forecasted ammonia concentration is above the respective nominal value, triggering engine conditions with higher exhaust NOx concentration. In this way, ammonia slip may be reduced without degrading fuel economy.

Abstract: An exhaust-gas aftertreatment system for exhaust gases of an internal combustion engine. In one example, a portion of the engine exhaust gases goes to the particulate filter and the other portion of engine exhaust gases goes to the catalyst element. The outlet of the filter element is directed to the inlet of the catalyst element and the outlet of the catalyst element is directed to the inlet of the filter element. Thus, the engine exhaust gases are filtered and processed by a catalyst.

Abstract: The description relates to an exhaust gas purification system for exhaust gases that are emitted from an internal combustion engine, in particular a diesel engine. In one embodiment, exhaust gases from the engine are separated into two streams. The two exhaust streams are processed differently so as to take advantage of different attributes of different aftertreatment devices.

Abstract: The present application relates to a method of controlling urea dosing in an exhaust system of a vehicle. The method includes adjusting the urea dosing based on the severity of urea deposition on an SCR catalyst, where the urea dosing is reduced as the severity increases.

Abstract: A method for regenerating a particulate filter is disclosed. In one example, oxygen is pumped from the intake system of a direct injection turobocharged gasoline engine to the exhaust system by a compressor. The oxygen is introduced to a particulate filter at a location upstream from the particulate filter. In this way, regeneration of a particulate filter may be accomplished without disturbing the chemistry of a three-way catalyst located in the exhaust system upstream of the particulate filter.

Abstract: A method for regenerating a particulate filter is disclosed. In one example, oxygen is pumped from the intake system of a direct injection turobocharged gasoline engine through a cylinder and into the exhaust system by a compressor. In this way, regeneration of a particulate filter may be accomplished without an auxiliary air supply.

Abstract: A method for regenerating a particulate filter is disclosed. In one example, oxygen is pumped from the intake system of a direct injection turbocharged gasoline engine to the exhaust system by a compressor. The oxygen is introduced to a particulate filter at a location upstream from the particulate filter and downstream of a three-way catalyst. The oxygen may be regulated in part by adjusting compressor boost pressure in response to a state of particulate filter regeneration. Further, in one embodiment, engine NOx can be controlled by EGR.