METHOD FOR CORRECTING A MODELIZED VALUE OF A CONCENTRATION OF NOX NITROGEN OXIDES

摘要

A method of correcting a modeled value of a mass NOx (mNOxUS, mod) upstream of an SCR catalyst (12) in the exhaust gas line (10) of a motor vehicle which comprises a NOx sensor ( 172) downstream of the SCR catalyst (12) and a fill level observer (161). According to the method, both the specific demand of dosing agent (DBS) of the fill level observer (161) and also the information provided by a quality sensor (162) which monitors the quality of the filling level monitor are monitored. metering agent (141) for correcting the NOx mass (mNOxUS, mod) upstream of the SCR catalyst (12).