Exhaust gas purification device
    85.
    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。

    Emission control apparatus
    86.
    发明授权
    Emission control apparatus 失效
    排放控制装置

    公开(公告)号:US06679052B2

    公开(公告)日:2004-01-20

    申请号:US10201719

    申请日:2002-07-24

    IPC分类号: F01N300

    摘要: An emission control unit includes a trunk passage, a loop passage connected to the trunk passage, and a path change portion that is provided in a connecting portion between the trunk passage and the loop passage and that includes a switching valve for changing the path of exhaust gas. The loop passage is provided with a first emission control portion for purifying NOx and carbon-containing particles present in exhaust gas. A second emission control portion for purifying NOx present in exhaust gas is provided in a downstream-side partial trunk passage. The emission control unit is equipped with a reducer injection nozzle for injecting into a first partial loop passage a reducing agent for recovering the emission control functions of the two emission control portions.

    摘要翻译: 排气控制单元包括主干通道,连接到主干通道的回路通道和设置在主干通道和回路通道之间的连接部分中并且包括用于改变排气路径的切换阀的路径改变部分 加油站。 环路通道设置有用于净化废气中存在的NOx和含碳颗粒的第一排放控制部分。 用于净化废气中存在的NOx的第二排放控制部分设置在下游侧部分干道中。 排放控制单元配备有还原剂注入喷嘴,用于将用于回收两个排放控制部分的排放控制功能的还原剂注入到第一部分回路通道中。

    Exhaust gas purification device for an engine
    90.
    发明授权
    Exhaust gas purification device for an engine 失效
    发动机废气净化装置

    公开(公告)号:US5941067A

    公开(公告)日:1999-08-24

    申请号:US951783

    申请日:1997-10-16

    摘要: An exhaust gas purification device, for an engine having an exhaust passage, said device comprising a catalyst arranged in the exhaust passage for purifying NO.sub.x with a reducing agent. A purification ratio of the NO.sub.x by said catalyst becomes more than a predetermined ratio when a temperature of said catalyst is within a predetermined temperature range. A predetermined amount of a reducing agent is fed to said catalyst. An amount of the reducing agent to be fed is increased with respect to the predetermined amount when a temperature of an upstream end of the catalyst is lower than a lowest value of the predetermined temperature range and a temperature of a downstream end of the catalyst is higher than the lowest value.

    摘要翻译: 一种用于具有排气通道的发动机的废气净化装置,所述装置包括布置在用于通过还原剂净化NOx的排气通道中的催化剂。 当所述催化剂的温度在预定的温度范围内时,所述催化剂的NOx的净化比率大于预定的比例。 将预定量的还原剂加入到所述催化剂中。 当催化剂的上游端的温度低于预定温度范围的最低值并且催化剂的下游端的温度较高时,待进料的还原剂的量相对于预定量增加 比最低值。