Exhaust gas purification system and exhaust gas purification...

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

Patent

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F01N 3/08 (2006.01) B01D 53/94 (2006.01) F01N 3/02 (2006.01) F01N 3/28 (2006.01) F02D 41/04 (2006.01)

Patent

CA 2700270

An exhaust gas purification system which, in a wider temperature range, can reduce and remove nitrogen oxides in an exhaust gas by a reduction catalyst with the use of hydrogen as a reducing agent is provided. The exhaust gas purification system has an electronic control device (41) which controls an EGR valve (4) and an EGR pipe (5) so that the concentration of oxygen in the exhaust gas obtained from a data map based on the state of an engine (10) becomes less than a predetermined value, and which controls a microreactor (19) so that hydrogen is added to the exhaust gas when the concentration of oxygen in the exhaust gas is less than the predetermined value.

L'invention porte sur un système de purification d'échappement qui peut, dans une plage de températures plus large, réduire et retirer un oxyde d'azote dans un gaz d'échappement à l'aide d'un catalyseur de réduction en utilisant de l'hydrogène comme agent réducteur. Le système de purification d'échappement comporte un dispositif de commande électronique (41). Le dispositif de commande électronique (41) commande une vanne de recirculation de gaz d'échappement (4) et un tuyau de recirculation de gaz d'échappement (5), de telle sorte que la concentration en oxygène dans le gaz d'échappement, cette concentration étant obtenue à partir d'une carte de données basée sur les conditions du moteur (6), devient inférieure à une valeur prédéterminée, le dispositif de commande électronique (41) commandant également un microréacteur (19) de telle sorte que de l'hydrogène est ajouté au gaz d'échappement lorsque la concentration en oxygène dans le gaz d'échappement est inférieure à la valeur prédéterminée.

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