Device for purifying exhaust of internal combustion engine

Details Device for purifying exhaust of internal combustion engine Device for purifying exhaust of internal combustion engine

F - Mech Eng,Light,Heat,Weapons

01

N

F01N 3/18 (2006.01) B01D 53/04 (2006.01) F01N 3/08 (2006.01) F01N 3/20 (2006.01) F01N 3/24 (2006.01) F01N 9/00 (2006.01) F02D 41/02 (2006.01) F01N 13/02 (2010.01) F02B 1/04 (2006.01)

Patent

CA 2097609

An NO x absorbent (18) is disposed in an exhaust passage of an internal combustion engine and the exhaust gas is constantly made to circulate through the NO x absorbent (18) during the operation of the engine. The NO x absorbent (18) absorbs the NO x when the air-fuel ratio of the exhaust gas flowing into the NO x absorbent (18) is lean and releases the absorbed NO x when the air-fuel ratio of the exhaust gas flowing into the NO x absorbent (18) becomes the stoichiometric air-fuel ratio or rich. In the majority of the engine operation region, the lean air-fuel mixture is burned in the combustion chamber (3), and the NO x generated at this time is absorbed into the NO x absorbent (18). The air-fuel ratio of the exhaust gas flowing into the NO x absorbent (18) is periodically made the stoichiometric air-fuel ratio or rich, and the NO x absorbed in the NO x absorbent (18) is released, and simultaneously reduced.

Un absorbant de NOx (18) est disposé dans le trajet des gaz d'échappement dans le moteur à combustion interne, et les gaz d'échappement sont adaptés pour s'écouler constamment à travers ledit absorbant (18) lors du fonctionnement du moteur. L'absorbant de NOx absorbe le NOx lorsqu'un rapport air-carburant de gaz d'échappemetn circulant dans ledit absorbant (18) est pauvre et, lorsqu'un rapport air-carburant de gaz d'échappement devient égal au rapport air-carburant théorique ou riche, il évacue le NOx qu'il a absorbé. Sur pratiquement la totalité de la plage de fonctionnement du moteur, un mélange gazeux pauvre est brûlé dans la chambre de combustion (3) et le NOx produit à ce moment-là est absorbé par ledit absorbant (18). Un rapport air-carburant de gaz d'échappement circulant dans l'absorbant de NOx (18) est périodiquement égalisé avec le rapport théorique ou riche, et le NOx ayant été absorbé par l'absorbant (18) est évacué et réduit en même temps.

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