Patent ID: 6705078
Filing Date: 2004-03-16
Classification: B01D,F01N,F02D

Abstract:
Method for controlling a NOx storage catalyst disposed in an exhaust gas channel of an internal combustion engine with a NOx-sensitive measuring device, which is arranged downstream of the NOx storage catalyst, wherein an analysis is performed of a signal form (SV) of the NOx sensitive measuring device after the internal combustion engine has been switched over into a lean operating mode with respect to at least one preset criterion, chosen from the group consisting of (A) a transition of a decreasing signal form (SV) to a non-negative slope of the signal form (SV) and (B) a drop of the signal below a predetermined threshold value, and wherein a time when at least one of the preset criteria is satisfied, is defined as a reference time (t0) for controlling one or both of the NOx regeneration and desulphurization processes of the NOx storage catalyst.