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    Emission control apparatus for internal combustion engine
    1.
    发明公开
    Emission control apparatus for internal combustion engine 有权
    AbgaskontrollvorrichtungfürBrennkraftmaschine

    公开(公告)号：EP1041254A2

    公开(公告)日：2000-10-04

    申请号：EP00105874.2

    申请日：2000-03-20

    申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA

    发明人： Suzuki, Naoto, c/o Toyota Jidosha K.K. ,  Katoh, Kenji, c/o Toyota Jidosha K.K.

    IPC分类号： F01N3/20 ,  F02D41/02 ,  F02D41/14

    CPC分类号： F01N3/0842 ,  B01D53/9431 ,  B01D53/9495 ,  F01N3/0814 ,  F01N13/009 ,  F01N13/011 ,  F01N13/107 ,  F01N2560/026 ,  F02D41/0275 ,  F02D41/1456 ,  F02D41/1463 ,  F02D41/2441 ,  F02D41/2474

    摘要： An NOx-absorbing and reducing catalyst device (7) is disposed in an exhaust passage of an engine (1). The NOx concentration in exhaust gas flowing out of the catalyst device is detected by an NOx sensor (33). Every time the NOx concentration detected by the NOx sensor increases to a predetermined value, an electronic control unit (ECU) (30) of the engine reactivates the NOx-absorbing and reducing catalyst device (7) by operating the engine (1) at a rich air fuel ratio for a short time. The ECU (30) also detects a deviation of the output of the NOx sensor (33) on the basis of a reference value (corresponding to zero NOx concentration) and an output of the NOx sensor (33) produced when the engine is being operated in a condition where the amount of NOx discharged from the engine is small, for example, a condition where the air-fuel ratio is on the lean side and the load is low (that is, in a condition where the NOx concentration in exhaust gas reaching the NOx sensor (33) becomes substantially zero). Based on the detected deviation, the ECU (30) corrects the output of the NOx sensor (33).

    摘要翻译： 在发动机（1）的排气通道中设置有吸收和还原的催化剂装置（7）。 由NOx传感器（33）检测从催化剂装置流出的废气中的NOx浓度。 每当由NOx传感器检测到的NOx浓度增加到预定值时，发动机的电子控制单元（ECU）（30）通过在发动机（1）处操作而使NOx吸收和还原催化剂装置（7）重新启动 丰富的空燃比在短时间内。 ECU（30）还基于参考值（对应于零的NOx浓度）和在发动机运转时产生的NOx传感器（33）的输出来检测NOx传感器（33）的输出的偏差 在从发动机排出的NOx的量小的情况下，例如，空燃比处于稀薄侧，负荷低的条件（即排气中的NOx浓度 到达NOx传感器（33）变得基本上为零）。 基于检测到的偏差，ECU（30）校正NOx传感器（33）的输出。