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    • 9. 发明授权
    • Exhaust purification apparatus for internal combustion engine
    • 内燃机排气净化装置
    • US08555623B2
    • 2013-10-15
    • US12936706
    • 2008-04-18
    • Yuji YasuiIkue KawasumiMichael Fischer
    • Yuji YasuiIkue KawasumiMichael Fischer
    • F01N3/10
    • F01N3/208F01N13/0093F01N13/0097F01N2560/021F01N2570/18F01N2610/02F01N2610/146F01N2900/0408F01N2900/0411F01N2900/1402F01N2900/1622Y02T10/24
    • An exhaust purification apparatus for internal combustion engine having a selective reduction catalyst that while maintaining a high NOx reduction ratio, inhibits any ammonia discharge downstream of the selective reduction catalyst. In the exhaust purification apparatus (2), a urea selective reduction catalyst (23) comprises a first selective reduction catalyst (231) and, provided downstream of the first selective reduction catalyst (231) in an exhaust passageway (11), a second selective reduction catalyst (232). Further, the exhaust purification apparatus (2) includes a urea injection unit (25) for feeding of a reducing agent upstream of the urea selective reduction catalyst (23) in the exhaust passageway (11) and an ammonia sensor (26) for detection of the ammonia concentration at a site between the first selective reduction catalyst (231) and the second selective reduction catalyst (232) in the exhaust passageway (11). The rate of urea injection, GUREA, by the urea injection unit (25) is determined so that the value of ammonia concentration, NH3CONS, detected by the ammonia sensor (26) is greater than “0.”
    • 具有选择还原催化剂的内燃机的排气净化装置,其在保持高NOx还原率的同时,抑制选择还原催化剂下游的氨排放。 在排气净化装置(2)中,尿素选择还原催化剂(23)包括第一选择还原催化剂(231),并且设置在排气通路(11)中的第一选择还原催化剂(231)的下游,第二选择还原催化剂 还原催化剂(232)。 此外,排气净化装置(2)具备:尿素喷射单元(25),用于在排气通路(11)中的尿素选择还原催化剂(23)的上游侧供给还原剂,以及氨传感器(26) 在排气通道(11)中的第一选择还原催化剂(231)和第二选择还原催化剂(232)之间的位置处的氨浓度。 确定尿素注入单元(25)的尿素注入速率GUREA,使得氨传感器(26)检测到的氨浓度NH3CONS值大于“0”。