Exhaust gas purification device

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

Patent

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Details

F01N 3/02 (2006.01) B01D 46/42 (2006.01)

Patent

CA 2632184

An exhaust gas purification device (101, 102, 103) having a DPF (33) provided in an exhaust system (30) of an internal combustion engine. The device has one or more sound pressure measurement means (8F, 8R) for measuring exhaust sound pressure and calculation means (10) for calculating the amount of PM accumulation based on the exhaust sound pressure measured. On the upstream side of the DPF (33) are arranged exhaust gas temperature measurement means (36) and exhaust gas temperature raising means (34). The exhaust gas temperature raising means (34) is activated when the amount of PM accumulation calculated by the calculation means (10) is higher than a preset default and at the same time when the exhaust gas temperature measured by the exhaust temperature measurement means (36) is lower than a lower limit of a temperature region in which the DPF (33) can be regenerated.

La présente invention concerne un dispositif d~épuration des gaz d~échappement (101, 102, 103) possédant un DPF (33) disposé dans un système d~échappement (30) d~un moteur à combustion interne. Le dispositif possède un ou plusieurs moyens de mesure de la pression acoustique (8F, 8R) servant à mesurer la pression acoustique d~échappement, ainsi qu~un moyen de calcul (10) servant à calculer la quantité d~accumulation de PM en fonction de la pression acoustique d~échappement mesurée. Du côté amont du DPF (33), un moyen de mesure de la température des gaz d~échappement (36) ainsi qu~un moyen d~augmentation de la température des gaz d~échappement (34) sont disposés. Le moyen d~augmentation de la température des gaz d~échappement (34) est activé lorsque la quantité d~accumulation de PM calculée par le moyen de calcul (10) est supérieure à une valeur prédéterminée et qu~au même moment la température des gaz d~échappement mesurée par le moyen de mesure de la température des gaz d~échappement (36) est inférieure à un seuil d~une région de température dans laquelle le DPF (33) peut être regénéré.

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