Engine control and catalyst monitoring with downstream exhaust gas sensors
    8.
    发明授权
    Engine control and catalyst monitoring with downstream exhaust gas sensors 失效
    发动机控制和催化剂监测与下游废气传感器

    公开(公告)号:US06904751B2

    公开(公告)日:2005-06-14

    申请号:US10454329

    申请日:2003-06-04

    摘要: A system and method for controlling an internal combustion engine for low emissions include an inner feedback control loop to control the engine fuel/air ratio with feedback provided by a first exhaust gas sensor and an outer feedback control loop that modifies a reference fuel/air ratio provided to the inner feedback control loop based on feedback signals provided by a second exhaust gas sensor positioned downstream relative to a portion of the catalyst and a third exhaust gas sensor positioned downstream relative to the second exhaust gas sensor. Catalyst gains are determined by modeling the catalyst as an integrator with an unknown gain and estimating the catalyst gain based on the exhaust gas sensors with the gain used to monitor catalyst performance and/or modify the engine fuel/air ratio.

    摘要翻译: 用于控制用于低排放的内燃机的系统和方法包括内部反馈控制回路,以通过由第一废气传感器和外部反馈控制回路提供的反馈来控制发动机燃料/空气比,所述外部反馈控制回路修改参考燃料/空气比 基于由相对于催化剂的一部分位于下游的第二排气传感器提供的反馈信号和位于第二排气传感器下游的第三排气传感器提供给内部反馈控制回路。 催化剂增益通过将催化剂模拟为具有未知增益的积分器来确定,并且基于具有用于监测催化剂性能和/或改变发动机燃料/空气比的增益的废气传感器估计催化剂增益。