System for triggering the purging of NOx trap depollution means

Details System for triggering the purging of NOx trap depollution means System for triggering the purging of NOx trap depollution means

2007-08-07

2007-08-07

Nguyen, Tu M. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S276000, C060S277000, C060S295000, C060S297000

Reexamination Certificate

active

11312284

ABSTRACT:
A system for triggering purging of depollution means including a NOx trap and integrated in a vehicle diesel exhaust line comprises respective elements for establishing: a first coefficient representing the extent to which the trap is full of NOx; a second coefficient representative of the capacity of the trap to reduce the NOx as a function of its temperature; a third coefficient representative of the capacity of the engine to purge the trap as a function of the engine operating point; and a fourth coefficient representative of the capacity of the engine to purge the trap as a function of the corresponding excess fuel consumption; together with a device for combining these various coefficients in order to obtain a fifth and final coefficient, and a comparator for comparing the fifth coefficient with a threshold so that in the event of the threshold being exceeded, a request is issued to trigger purging of the trap.

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