EXHAUST GAS PURIFYING DEVICE FOR INTERNAL COMBUSTION ENGINE
    73.
    发明公开
    EXHAUST GAS PURIFYING DEVICE FOR INTERNAL COMBUSTION ENGINE 审中-公开
    内燃机排气净化装置

    公开(公告)号:EP1882093A1

    公开(公告)日:2008-01-30

    申请号:EP06746243.2

    申请日:2006-05-01

    IPC分类号: F02D41/02 F02D41/14 F01N3/08

    摘要: An NOX occluding and reducing catalyst 7 is arranged in an exhaust gas passage 2 of an engine 1 so as to occlude, reduce and purify NOX contained in an exhaust gas. An H2 sensor 33 is arranged in the exhaust gas passage on a downstream side of the NOX occluding and reducing catalyst 7 and a hydrogen component concentration of the exhaust gas is detected. When an amount of NOX occluded in the NOX occluding and reducing catalyst is increased to a predetermined value, an electronic control unit (ECU) 30 of the engine operates the engine at a rich air-fuel ratio, and a regenerating operation, by which a rich air-fuel ratio exhaust gas is supplied to the NOX occluding and reducing catalyst, is executed so as to reduce and purify NOX which is occluded in the NOX occluding and reducing catalyst. At the time of executing the regenerating operation, when the H2 sensor 33 detects hydrogen components in the exhaust gas, ECU 30 finishes the regenerating operation. Due to the foregoing, it is possible to accurately judge the time for terminating the regenerating operation of the NOX occluding and reducing catalyst.

    摘要翻译: 在发动机1的排气通路2中配置有NOX吸留还原催化剂7,以吸留,还原净化废气中含有的NOX。 H 2传感器33布置在NO X吸留还原催化剂7的下游侧的排气通道中,并且检测排气的氢成分浓度。 当在NOx吸留还原催化剂中吸留的NOX量增加到预定值时,发动机的电子控制单元(ECU)30以浓空燃比操作发动机,并且执行再生操作,通过该再生操作, 向NOx吸留还原催化剂供给浓空燃比排气,以便还原和净化吸留在NOx吸留还原催化剂中的NOx。 在执行再生操作时,当H2传感器33检测到排气中的氢成分时,ECU30结束再生操作。 由此,能够准确地判断NOX吸留还原催化剂的再生动作结束时刻。