Exhaust Gas Aftertreatment Installation and Method

摘要

An exhaust gas aftertreatment installment and associated exhaust gas aftertreatment method utilizes a nitrogen oxide storage catalytic converter and an SCR catalytic converter. A particulate filter is provided upstream of the nitrogen oxide storage catalytic converter or between the latter and the SCR catalytic converter or downstream of the SCR catalytic converter. The time of regeneration operating phases of the nitrogen oxide storage catalytic converter can be determined as a function of the nitrogen oxide content of the exhaust gas downstream of the nitrogen oxide storage catalytic converter or of the SCR catalytic converter and/or as a function of the ammonia loading of the latter. Moreover, a desired ammonia generation quantity can be determined for a respective regeneration operating phase. The installation and method are adopted for use for motor vehicle internal combustion engines and other engines which are operated predominantly in lean-burn mode.

主权项

1. An installation for aftertreatment of exhaust gas generated by a combustion device of a motor vehicle, the installation comprising:
an NO2 producing catalytic converter arranged in an exhaust gas line of the motor vehicle so as to receive the exhaust gas generated by the combustion device; an SCR catalytic converter arranged in the exhaust gas line downstream of the NO2 producing catalytic converter, wherein the SCR catalytic converter is configured to store ammonia and to reduce nitrogen oxides in the exhaust gas with the stored ammonia; a particulate filter arranged in the exhaust gas line downstream of the NO2 producing catalytic converter and upstream of the SCR catalytic converter, wherein the particulate filter has a catalytic coating comprising an SCR catalyst.