Patent ID: 9038370
Filing Date: 2015-05-26
Classification: F01N,Y02A,Y02T

Abstract:
1. A method for operating an exhaust gas emission control system of a motor vehicle internal combustion engine, in the exhaust gas line of which an oxidation-catalytically active exhaust gas emission control component is arranged upstream of a SCR-catalyst, the method comprising: adjusting different hydrocarbon fractions in the exhaust gas upstream of the oxidation-catalytically active exhaust gas emission control component; determining an ageing state of the oxidation-catalytically active exhaust gas emission control component by correlating a hydrocarbon fraction present in the exhaust gas emission upstream of the oxidation-catalytically active exhaust emission component with a simultaneous nitrogen oxide conversion of the SCR-catalyst, wherein a hydrocarbon fraction associated with an undercutting of a presettable nitrogen oxide conversion is used as the basis for determining the ageing state; and adjusting operation of the internal combustion engine or the exhaust gas emission control system based on the determined ageing of the oxidation-catalytically active exhaust gas emission control component.