Arrangement for exhaust-gas aftertreatment system for an internal combustion engine and method for operating the exhaust-gas aftertreatment system arrangement

摘要

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.

主权项

1. An exhaust-gas aftertreatment system arrangement for an internal combustion engine, comprising:
an exhaust tract receiving an exhaust-gas stream from the internal combustion engine including:
a main exhaust branch with a first NOx storage catalytic converter positioned therein;a first bypass branch branching off from the main exhaust branch at a branching point 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 through which at least a part of the exhaust-gas stream can flow;a second NOx storage catalytic converter arranged in the main exhaust branch downstream of an opening-in point of the first bypass branch into the main exhaust branch;a second bypass branch branching off from the main exhaust branch at a branching point downstream of the opening-in point of the first bypass branch into the main exhaust branch and upstream of the second NOx storage catalytic converter and through which at least a part of the exhaust-gas stream can flow; anda coated diesel particle filter arranged between the first and second NOx storage catalytic converters.