Exhaust gas purification device
    6.
    发明授权
    Exhaust gas purification device 有权
    废气净化装置

    公开(公告)号:US06823664B2

    公开(公告)日:2004-11-30

    申请号:US10307311

    申请日:2002-12-02

    IPC分类号: F01N300

    摘要: An exhaust gas purification device having a NOx absorbent includes a by-pass passage for by-passing the NOx absorbent, an exhaust gas flow rate control portion for regulating both a flow rate of exhaust gas flowing to the NOx absorbent and the flow rate of the exhaust gas bypassing the NOx absorbent, and a reductant addition portion for adding reductant into an exhaust passage upstream of the NOx absorbent. In this device, when it is necessary to discharge sulfur components from the NOx absorbent, a temperature rise control is executed such that a temperature of the NOx absorbent becomes higher than a predetermined temperature. Next, a rich condition control is executed such that an air-fuel ratio of the exhaust gas flowing to the NOx absorbent becomes one of a substantially stoichiometric condition and a rich condition. The flow rate of the exhaust gas to the NOx absorbent during the temperature rise control is controlled so as to be higher than that during the rich condition control.

    摘要翻译: 具有NOx吸收剂的排气净化装置具有用于旁路NOx吸收剂的旁路通路,排气流量控制部,用于调节流向NOx吸收剂的废气的流量和 旁路NO x吸收剂的废气和用于将还原剂添加到NOx吸收剂上游的排气通道的还原剂添加部分。 在该装置中,当需要从NOx吸收剂排出硫成分时,执行升温控制,使得NOx吸收剂的温度变得高于预定温度。 接下来,执行丰富状态控制,使得流向NOx吸收剂的废气的空燃比成为基本上理论上的条件和浓度条件之一。 在升温控制期间,排气对NOx吸收剂的流量进行控制,使其高于浓缩条件控制时的流量。