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    • 36. 发明公开
    • EXHAUST GAS PURIFIER FOR INTERNAL COMBUSTION ENGINE
    • ABGASREINIGERFÜREINE BRENNKRAFTMASCHINE
    • EP2487343A1
    • 2012-08-15
    • EP09850267.7
    • 2009-10-09
    • Toyota Jidosha Kabushiki Kaisha
    • ASANUMA, TakamitsuNISHIOKA, HiromasaTSUKAMOTO, YoshihisaMATSUO, JunichiUMEMOTO, Kazuhiro
    • F01N3/08F01N3/24F01N3/28
    • F01N13/02F01N3/0814F01N3/0842F01N3/0871F01N3/2066F01N3/2073F01N2900/1404Y02T10/24
    • An exhaust purification system of an internal combustion engine of the present invention is provided with a selective reduction type NO x catalyst device 1 which can hold ammonia and a storage reduction type NO x catalyst device 3 which is arranged at an upstream side of the selective reduction type NO x catalyst device, which makes an air-fuel ratio of exhaust gas which flows into the storage reduction type NO x catalyst device change from a lean air-fuel ratio to a rich air-fuel ratio for starting an ammonia generation period, and which makes an air-fuel ratio of exhaust gas which flows into the storage reduction type NO x catalyst device change from a rich air-fuel ratio to a lean air-fuel ratio for ending the ammonia generation period. An amount of NO x which is held at the storage reduction type NO x catalyst device for starting the ammonia generation period when a temperature of the storage reduction type NO x catalyst device is less than a set temperature is smaller than that when a temperature of the storage reduction type NO x catalyst device is the set temperature or more.
    • 本发明的内燃机的排气净化系统具备能够容纳氨的选择还原型NO x催化剂装置1和配置在选择还原反应的上游侧的储存还原型NO x催化剂装置3 NO x催化剂装置,其使流入储存还原型NO x催化剂装置的废气的空燃比从稀空燃比变为用于开始氨生成期的浓空燃比, 这使得流入储存还原型NO x催化剂装置的排气的空燃比从浓空燃比变为稀空燃比,以终止氨生成周期。 当存储还原型NO x催化剂装置的温度小于设定温度时,保持在用于开始氨生成周期的储存还原型NO x催化剂装置上的一定量的NO x小于 储存还原型NO x催化剂装置是设定温度以上。