Patent ID: 7596942

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 constant torque, 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, making it possible to obtain different thermal levels in the exhaust line, wherein said system comprises means for analyzing the loading state of the depollution means and means for comparing this loading state with predetermined threshold values, to implement the first regeneration strategy for loading states under the threshold values or the second strategy for loading states above the threshold values, wherein said level 2 strategies is calibrated using a maximal exhaust collector temperature of 800° C. and said over-calibrated level 2 strategies is calibrated using a maximal exhaust collector temperature of 830° C., and wherein said second regeneration strategy allows reaching a temperature at the particle filter inlet of 650° C. in 220 seconds in EUDC cycle whereas this temperature is never reached in EUDC cycle in the first regeneration strategy, and a temperature at the particle filter inlet of 600° C. in 150 seconds in City cycle whereas this temperatures is never reached in City cycle in the first regeneration strategy, so that regeneration with a higher temperature is performed, and the risk that the substrate may crack is reduced.