Exhaust purification system of internal combustion engine

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

Patent

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F01N 3/08 (2006.01) B01D 53/94 (2006.01) F01N 3/28 (2006.01)

Patent

CA 2755977

Inside an engine exhaust passage, in order from the upstream side, a hydrocarbon feed valve (16), oxidation catalyst (13), and exhaust purification catalyst (14) are arranged. A first NO X purification method which lowers the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst (14) by a predetermined period while maintaining it lean so as to remove NO X without causing NO X to be stored in the form of nitrates and a second NO X purification method which switches the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst (14) from lean to rich by a period longer than the above period so as to remove NO X are selectively used in accordance with an operating state of the engine.

L'invention porte sur un dispositif d'épuration des gaz d'échappement. Ce dispositif comprend une soupape d'alimentation en hydrocarbure (16), un catalyseur d'oxydation (13) et un catalyseur d'épuration des gaz d'échappement (14) qui sont disposés dans cet ordre à partir du côté amont à l'intérieur d'un conduit d'échappement du moteur. En réponse aux conditions de fonctionnement du moteur, il est possible d'utiliser sélectivement un premier procédé d'épuration des NOx qui élimine les NOx sans accumulation de NOx sous la forme d'un nitrate par diminution, selon un cycle prédéterminé, du rapport air-carburant des gaz d'échappement qui parviennent au catalyseur d'épuration des gaz d'échappement (14) alors que le rapport air-carburant est maintenu bas, et un deuxième procédé d'épuration des NOx qui élimine les NOx par une commutation du rapport air-carburant des gaz d'échappement arrivant au catalyseur d'épuration des gaz d'échappement (14) de pauvre à riche selon un cycle qui est plus long que le cycle précité.

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