METHOD AND MODEL FOR MODELING AN ELIMINATION PHASE OF A NITROGEN OXIDE ACCUMULATING CATALYTIC CONVERTER

摘要

The invention further relates to a method and a model for modeling a discharge phase of a nitrogen oxide (NOx)-storage catalytic converter ( 12 ') of an internal combustion engine ( 1 ). The NOx-storage catalytic converter ( 12 ') is subdivision into an oxygen (O2)-store and a nitrogen oxide (NOx)-store and a reducing agent mass flow (msrg) is determined which charges the O2-store and the NOx-store. To model a discharge phase of the NOx-storage catalytic converter ( 12 '), the O2-store is modeled via a first integrator for oxygen (O2) and the NOx-store via a second integrator for nitrogen oxide (NOx) and the first integrator and the second integrator are charge proportionally with the reducing agent mass flow (msrg) in accordance with an apportioning factor determined in dependence upon the O2-store content (mo2sp) and the NOx-store content (mnosp) of the NOx-storage catalytic converter ( 12 ').