Patent ID: 7251930
Filing Date: 2007-08-07
Classification: F02D

Abstract:
1. A system for triggering purging of depollution means comprising a NOx trap and integrated in a motor vehicle diesel exhaust line, the system comprising: means for establishing a first coefficient representing the degree to which the NOx trap is full of NOx; means for establishing a second coefficient representing the capacity of the NOx trap to reduce the stored NOx as a function of the NOx trap's temperature; means for establishing a third coefficient representative of the capacity of the engine to purge the NOx trap as a function of the engine operating point; means for establishing a fourth coefficient representative of the capacity of the engine to purge the NOx trap as a function of the corresponding excess fuel consumption and as a function of current fuel consumption; means for combining said coefficients to obtain a fifth and final coefficient; and comparator means for comparing the fifth and final coefficient with a threshold so that in the event of the threshold being crossed, a request is issued to trigger purging of the NOx trap.