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    • 69. 发明授权
    • Exhaust emission control device of internal combustion engine
    • 内燃机废气排放控制装置
    • US06502391B1
    • 2003-01-07
    • US09890216
    • 2001-07-24
    • Shinya HirotaShunsuke ToshiokaToshiaki Tanaka
    • Shinya HirotaShunsuke ToshiokaToshiaki Tanaka
    • F01N300
    • F01N3/2053F01N3/0814F01N3/0835F01N3/0842F01N3/085F01N3/0878F01N3/0885F01N3/2066F01N13/009F01N13/0093F01N13/011F01N2430/085F01N2570/04F01N2570/14Y02A50/2325Y02A50/2344Y02T10/24
    • An object of the present invention is to improve reliability of exhaust emission purification in an exhaust emission purifying device having an NOx catalyst and an bypass path bypassing the NOx catalyst. The present invention provides an exhaust emission purifying device including an SOx absorbing material 17 provided in an exhaust passage of an internal combustion engine, a main NOx catalyst 20 provided in the exhaust passage on the downstream side of the SOx absorbing material, a bypass pipe 26 branching off from the exhaust passage at a position between the SOx absorbing material 17 and the main NOx catalyst 20, and an exhaust switching valve 28 provided at the start end of the bypass pipe 26 and adapted to switch the exhaust flow between the main NOx catalyst 20 and the bypass pipe 26, wherein a sub NOx catalyst 24 is provided in the bypass pipe 26 and wherein when the exhaust switching valve 28 is controlled so as to lead the exhaust to the main NOx catalyst 20 and as to prevent the exhaust from flowing through the bypass pipe 26, any exhaust leaking from the exhaust switching valve 28 to the bypass pipe 26 is purified by the sub NOx catalyst 24.
    • 本发明的目的在于提高具有NOx催化剂和绕过NOx催化剂的旁路的排气净化装置的排气净化装置的可靠性。 本发明提供了一种排气净化装置,其包括设置在内燃机的排气通路中的SOx吸收材料17,设置在SO x吸收材料的下游侧的排气通路中的主NOx催化剂20,旁通管26 在SO x吸收材料17和主NOx催化剂20之间的位置处从排气通道分支;以及排气切换阀28,其设置在旁通管26的起始端,并且适于切换主NOx催化剂 20和旁通管26,其中副NOx催化剂24设置在旁通管26中,并且其中当排气切换阀28被控制以将排气引导到主NOx催化剂20并且为了防止排气流动 通过旁通管26,通过副NOx催化剂24净化从排气切换阀28向旁通管26泄漏的任何废气。