Method for determining the charge state of a particle filter...

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

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F01N 9/00 (2006.01)

Patent

CA 2715125

A method for determining the charge state of a particle filter installed in the exhaust gas line of an internal combustion engine comprises the following steps: determining the exhaust gas volumetric flow in the flow direction of the exhaust gas downstream of the particle filter (2), detecting the pressure present in the exhaust gas line (1) in the direction of flow of the exhaust gas prior to the particle filter (2), comparing the exhaust gas volumetric flow determined hinter the particle filter (2) with the detected pressure present upstream of the particle filter (2) and evaluating the results of the comparison with consideration to the exhaust gas back pressure of the uncharged particle filter (2) and the exhaust gas back pressure caused by the particle filter charge, said pressure being higher than the uncharged filter. Further described is a corresponding device for reducing the particle emissions of an internal combustion engine.

L'invention concerne un procédé destiné à déterminer l'état de charge d'un filtre à particules monté dans le tuyau de gaz d'échappement d'un moteur à combustion interne et comprenant les étapes suivantes : détermination du débit volumique des gaz d'échappement dans la direction de circulation des gaz d'échappement derrière le filtre à particules (2) ; détection de la pression dans le tuyau de gaz d'échappement (1), dans la direction de circulation des gaz d'échappement, devant le filtre à particules (2) ; comparaison du débit volumique des gaz d'échappement déterminé dans la direction de circulation derrière le filtre à particules (2) et la pression détectée devant le filtre à particules (2) ; et évaluation du résultat de la comparaison en tenant compte de la contre-pression des gaz d'échappement du filtre à particules non chargé (2) et de la contre-pression des gaz d'échappement générée par la charge du filtre à particules, laquelle est supérieure à celle d'un filtre non chargé. On décrit également un dispositif correspondant pour réduire l'émission de particules d'un moteur à combustion interne.

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