System and methods for improved emission control of internal...

F - Mech Eng,Light,Heat,Weapons – 01 – N

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F01N 3/20 (2006.01) B01D 53/94 (2006.01) C01B 3/34 (2006.01) F01N 3/08 (2006.01) F01N 3/28 (2006.01)

Patent

CA 2524518

The present invention provides systems and methods to improve the performance and emission control of internal combustion engines equipped with nitrogen oxides storage-reduction (~NSR~) emission control systems. The system comprises a NSR catalyst (206), a fuel processor (200) located upstream o the NSR catalyst, and at least one fuel injection port (208). The fuel processor (200) converts a fuel into a reducing gas mixture comprising CO and H2. The reducing gas mixture is then fed into the NSR catalyst (206), where it regenerates the NSR adsorbent, reduces the NOx to nitrogen, and optionally periodically desulfates the NSR catalyst. The fuel processor (200) comprises one or more catalysts (308), which facilitate reactions such as combustion, partial oxidation, and/or reforming and help consume excess oxygen present in an engine exhaust stream. The methods of the present invention provide for NSR catalyst adsorbent regeneration using pulsed fuel flow. Control strategies are also provided.

L'invention concerne des systèmes et des méthodes pour améliorer la performance et la commande d'émission de moteurs à combustion interne équipés de systèmes de commande d'émission de réduction/stockage d'oxydes d'azote (NSR). Ce système comprend un catalyseur NSR (206), un processeur de combustible (200) situé en amont du catalyseur NSR, et au moins un port d'injection de combustible (208). Le processeur de combustible (200) convertit en combustible en un mélange gazeux réducteur comprenant CO et H¿2.? Ce mélange gazeux réducteur est ensuite injecté dans le catalyseur NSR (206) où il régénère l'adsorbant NSR, il réduit le NOX en azote, et il désulfate éventuellement périodiquement le catalyseur NSR. Le processeur de combustible (200) comprend au moins un catalyseur (308) facilitant des réactions, notamment la combustion, l'oxydation partielle, et/ou la reformation et aide à consumer l'oxygène en excès présent dans un écoulement de sortie de moteur. Les méthodes de l'invention permettent une régénération d'adsorbant de catalyseur NSR, en faisant appel à un écoulement de combustible pulsé. L'invention concerne également des stratégies de commande.

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