B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/94 (2006.01) F01N 3/08 (2006.01) F01N 11/00 (2006.01) F02D 41/02 (2006.01) F02D 41/14 (2006.01) F01N 13/02 (2010.01) F02B 37/00 (2006.01)
Patent
CA 2493529
Disclosed is a method according to which a first oxygen sensor (21) is disposed on the exhaust pipe upstream from a nitrogen oxide trap (18), and the development of a meaningful signal that is representative of the signal (3, 4) supplied by said sensor is monitored. A substantial increase (34, 44) of said meaningful signal, which is obtained following a variation (31, 41) resulting from the motor being switched from running on a lean mixture to running on a rich mixture, from a first plate (32, 42) having an essentially constant level is used as an indicator for controlling the end of the purge process. The invention applies to diesel engines.
Selon ce procédé, on dispose une première sonde à oxygène (21) sur le conduit d'échappement en aval du piège à oxydes d'azote (18), et on observe l'évolution d'un signal significatif représentatif du signal (3, 4) fourni par cette sonde, une augmentation sensible (34, 44) de ce signal significatif à partir d'un premier plateau (32, 42) de niveau sensiblement constant, obtenu suite à une variation (31, 41) consécutive à un passage du moteur d'un fonctionnement en mélange pauvre à un fonctionnement en mélange riche, étant utilisé comme indicateur pour commander la fin de la purge. Application aux moteurs diesels.
Cochet Stephane
Daneau Marc
Dionnet Bernard
Gauvin Fabrice
Guenounou Karim
Gowling Lafleur Henderson Llp
Renault S.a.s.
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