Importance

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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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First Claim