Patent ID: 6519930
Filing Date: 2003-02-18
Classification: B01D,F01N,F02D,Y02A,Y02T

Abstract:
In a method for monitoring a regeneratable NOx-storage device in an exhaust gas line through which an NOx-containing gas flows, the improvement which comprises:measuring a temperature in the exhaust gas line; inferring at least a storage capacity of the NOx-storage device from the measured temperature; computing NOx stored in the NOx-storage device in dependence on the NOx-containing gas flow; triggering a regeneration when a predeterminable limit value for the NOx is exceeded; and inferring at least one of operability, operating condition and storage capacity of the NOx-storage device from the measured temperature during regeneration, by comparison with at least one of a predeterminable temperature value and a predeterminable temperature band width.