A method for regenerating a nox adsorber catalyst

Details A method for regenerating a nox adsorber catalyst A method for regenerating a nox adsorber catalyst

F - Mech Eng,Light,Heat,Weapons

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F01N 3/00 (2006.01) F01N 3/08 (2006.01) F02D 13/02 (2006.01) F02D 41/00 (2006.01) F02D 41/02 (2006.01) F02B 3/06 (2006.01) F02B 23/06 (2006.01) F02B 37/00 (2006.01) F02D 41/14 (2006.01)

Patent

CA 2491453

A control (30) for controlling a variable valve actuation mechanism (26) of an internal combustion engine (10) to regenerate a NOx adsorber catalyst (35) in the exhaust system (22) of the engine. The control comprises an operating program (50) for regenerating the catalyst while the engine is running under its own power by causing the variable valve actuation mechanism to change the timing of operation of the intake valves (18) so as to transition the fuel-air ratio of mixture that is being combusted in the cylinders (16) from a relatively leaner mixture to a mixture that sufficiently richer than stoichiometric to effectively regenerate the catalyst.

L'invention concerne un dispositif (30) de commande destiné à commander un mécanisme (26) d'actionnement à programme variable d'un moteur (10) à combustion interne afin de régénérer un catalyseur (35) adsorbeur de NOx dans le système (22) d'échappement du moteur. Le dispositif de commande comprend un programme (50) d'exploitation permettant de régénérer le catalyseur tandis que le moteur tourne grâce à sa propre énergie, en fonction duquel le mécanisme d'actionnement à programme variable change la programmation de fonctionnement des soupapes (18) d'admission de manière à convertir le rapport carburant-air du mélange en combustion dans les cylindres (16) d'un mélange relativement appauvri à un mélange suffisamment plus riche que l'état stoechiométrique pour régénérer de manière efficace le catalyseur.

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