F - Mech Eng,Light,Heat,Weapons – 01 – N
Patent
F - Mech Eng,Light,Heat,Weapons
01
N
F01N 3/02 (2006.01) F01N 3/021 (2006.01) F01N 3/023 (2006.01) F01N 3/035 (2006.01) F01N 3/08 (2006.01) F02D 41/02 (2006.01) F02B 37/00 (2006.01) F02M 25/07 (2006.01)
Patent
CA 2369661
A particulate filter (22) carrying an active oxygen release agent which takes in oxygen and holds oxygen when excess oxygen is present in the surroundings and releases the held oxygen in the form of active oxygen when the concentration of oxygen in the surroundings falls is arranged in an exhaust passage of an engine. The air-fuel ratio of the exhaust gas flowing into the particulate filter (22) is normally maintained lean and is occasionally switched to rich temporarily. When the air- fuel ratio of the exhaust gas is switched to rich, an oxidation reaction of the particulate on the particulate filter is promoted by the active oxygen released from the active oxygen release agent. Due to this, the particulate in the exhaust gas is continuously removed by oxidation on the particulate filter (22) without emitting a luminous flame.
Dans le passage d'échappement d'un moteur à combustion interne est installé un filtre à substances particulaires (22) comprenant un agent dégageant de l'oxygène actif, absorbant et retenant l'oxygène lorsque l'oxygène environnant est excédentaire et dégageant l'oxygène retenu, sous forme d'oxygène actif, lorsque la concentration d'oxygène environnant diminue. Le rapport air-carburant des gaz d'échappement circulant dans le filtre à substances particulaires (22) est normalement maintenu du coté pauvre et est parfois basculé du côté riche. Lorsque le rapport air-carburant des gaz d'échappement bascule du coté riche, l'oxygène actif dégagé par l'agent de dégagement d'oxygène actif accélère la réaction d'oxydation des substances particulaires sur le filtre à substances particulaires. Ainsi, les substances particulaires contenues dans les gaz d'échappement sont supprimées en continu par oxydation, sans que des flammes lumineuses soient produites sur le filtre à substances particulaires (22).
Hirota Shinya
Itoh Kazuhiro
Kimura Koichi
Nakatani Koichiro
Tanaka Toshiaki
Borden Ladner Gervais Llp
Toyota Jidosha Kabushiki Kaisha
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