Method for monitoring exhaust gas aftertreatment devices
    12.
    发明授权
    Method for monitoring exhaust gas aftertreatment devices 有权
    废气后处理装置的监测方法

    公开(公告)号:US08387448B2

    公开(公告)日:2013-03-05

    申请号:US13008937

    申请日:2011-01-19

    IPC分类号: G01M15/10

    CPC分类号: G01M15/102

    摘要: A method for monitoring performance of a passive selective catalytic reduction system includes operating the internal combustion engine in a preconditioning mode. Subsequent to the preconditioning, an air/fuel excursion is introduced into the exhaust gas feedstream and a signal output from a sensor monitoring the exhaust gas feedstream in the selective catalytic reduction system during the air/fuel excursion is monitored. An operating effectiveness is determined for the selective catalytic reduction system correlated to the signal output from the sensor monitoring the exhaust gas feedstream.

    摘要翻译: 一种用于监测被动选择性催化还原系统的性能的方法包括以预处理模式操作内燃机。 在预处理之后,空气/燃料偏移被引入废气进料流中,并且监测在空气/燃料偏移期间在监测选择性催化还原系统中的废气进料流的传感器输出的信号。 确定与选择性催化还原系统相关的操作有效性,该系统与从监测废气进料流的传感器输出的信号相关。