Patent ID: 9097160
Filing Date: 2015-08-04
Classification: F01N,Y02T

Abstract:
1. A method for operating an SCR catalytic converter provided for the reduction of NOx in exhaust gases of an internal combustion engine, which SCR catalytic converter is operated with a reagent which can be stored in the SCR catalytic converter such that there is a certain reagent fill level in the SCR catalytic converter, the method comprising: monitoring an actual NOx concentration downstream of the SCR catalytic converter on the basis of a signal of a sensor, which is arranged downstream of the SCR catalytic converter and which is sensitive at least with respect to NOx, comparing the actual NOx concentration to a calculated NOx concentration downstream of the SCR catalytic converter, and correcting a previously calculated reagent fill level to a new calculated reagent fill level when comparison indicates a deficit between the measured actual NOx concentration and the calculated NOx concentration and immediately dosing reagent; further comprising in dosings carried out during the course of the operation of the catalytic converter, a summed dose amount additional dosing (mDOS