Exhaust gas purification device of internal combustion engine

Details Exhaust gas purification device of internal combustion engine Exhaust gas purification device of internal combustion engine

F - Mech Eng,Light,Heat,Weapons

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F02M 25/00 (2006.01) F01N 13/08 (2010.01) F01N 13/10 (2010.01) F01N 13/14 (2010.01) F01N 3/08 (2006.01) F01N 3/36 (2006.01) F01N 9/00 (2006.01) F02B 23/10 (2006.01) F02D 9/04 (2006.01) F02D 21/08 (2006.01) F02D 41/02 (2006.01) F02D 41/06 (2006.01) F02D 41/40 (2006.01) F01N 13/02 (2010.01) F01N 13/04 (2010.01) F02B 75/12 (2006.01) F02F 3/26 (2006.01) F02M 25/07 (2006.01)

Patent

CA 2375813

An exhaust control valve (24) is arranged in an exhaust pipe (22) of an internal combustion engine. At the time of engine startup and warmup operation, the exhaust control valve (24) is substantially fully closed, the amount of injection of main fuel is increased from the optimum amount of injection at the time when the exhaust control valve is fully opened, auxiliary fuel is additionally injected during the expansion stroke, and thereby the unburned hydrocarbons exhausted into the atmosphere is greatly reduced at the time of engine startup and warmup operation.

Ce dispositif de régulation de l'émission des gaz d'échappement d'un moteur à combustion interne présente une soupape de régulation (24) de l'émission des gaz d'échappement, montée dans un tuyau d'échappement (22) du moteur à combustion interne, et pratiquement complètement fermée au moment du démarrage du moteur et pendant la période de chauffe de celui-ci. La quantité de carburant principal injectée est augmentée jusqu'à atteindre la quantité d'injection optimale correspondant à l'état totalement ouvert de la soupape de régulation de l'émission des gaz d'échappement, un carburant auxiliaire étant injecté de manière additionnelle lors d'une course d'expansion, de façon à réduire ainsi notablement les hydrocarbures non brûlés qui s'échappent dans l'atmosphère, au moment du démarrage et de la période de chauffe du moteur.

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