Patent ID: 7631490

Claim:
System for assisting the regeneration of depollution means integrated in an exhaust line of a motor vehicle diesel engine, in which the engine is associated with common rail supply means for the injection of fuel into the cylinders thereof, according to at least one post-injection, and adapted to implement, at isotorque, through modification of parameters for controlling the operation of the engine, at least two regeneration strategies, among which a first regeneration strategy comprising strategies called level 1 strategies and level 2 strategies, and a second regeneration strategy comprising level 1 strategies and a sequence alternating level 2 strategies and over-calibrated level 2 strategies, wherein the level 2 strategy is calibrated according to the following criteria: maximal exhaust collector temperature=800° C. maximal catalyst exotherm=150° C. maximal catalyst outlet temperature=710° C. maximal catalyst internal temperature=760° C. minimal oxygen content of the gases at catalyst outlet=3% and the over-calibrated level 2 strategy is calibrated according to the following criteria: maximal exhaust collector temperature=830° C. maximal catalyst exotherm=200° C. maximal catalyst outlet temperature=730° C. maximal catalyst internal temperature=no maximal value minimal oxygen content of the gases at catalyst outlet=2% making it possible to obtain different thermal levels in the exhaust line, wherein said system comprises means for analyzing the driving conditions of the vehicle and means for comparing these driving conditions with predetermined threshold values, to implement the first regeneration strategy for driving conditions above the threshold values or the second strategy for driving conditions under the threshold values, so as to improve the chances of success of the regeneration in critical driving conditions while increasing a security margin with respect to cracking or breakage of the depollution means.