Exhaust gas purifying apparatus and method for internal combustion engine
    91.
    发明授权
    Exhaust gas purifying apparatus and method for internal combustion engine 失效
    内燃机废气净化装置及方法

    公开(公告)号:US5517820A

    公开(公告)日:1996-05-21

    申请号:US214303

    申请日:1994-03-17

    摘要: An apparatus is provided for purifying an exhaust gas discharged from an internal combustion engine, which comprises a first exhaust gas passage including a nitrogen oxide removing catalyst and a three way catalyst, a second exhaust gas passage including the three way catalyst, a gas flow regulator for selectively directing the exhaust gas to the first and second exhaust gas passages, and a control unit which directs the exhaust gas to the first exhaust gas passage (thereby passing exhaust gas first through the nitrogen oxide removing catalyst and thereafter through the three way catalyst) when the temperature of the nitrogen oxide removing catalyst is within a hydrocarbon adsorbing range of temperature thereof while the engine is warming up, and to the second exhaust gas passage (thereby passing the exhaust gas only through the three way catalyst) when the temperature of the nitrogen oxide removing catalyst exceeds the hydrocarbon adsorbing range of temperature thereof.

    摘要翻译: 提供了一种用于净化从内燃机排出的废气的装置,其包括包括氮氧化物除去催化剂和三元催化剂的第一废气通道,包括三元催化剂的第二排气通道,气流调节器 用于将废气选择性地引导到第一和第二废气通道;以及控制单元,其将废气引导到第一废气通道(从而首先通过废气首先通过氮氧化物除去催化剂,然后通过三元催化剂) 当发动机升温时氮氧化物除去催化剂的温度在其烃吸附范围内,并且当第二排气通道(从而仅通过三元催化剂使排气通过时) 氮氧化物除去催化剂超过其烃吸附温度范围。