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    • 31. 发明授权
    • System and method for monitoring catalyst efficiency and post-catalyst oxygen sensor performance
    • 用于监测催化剂效率和催化后氧传感器性能的系统和方法
    • US08516796B2
    • 2013-08-27
    • US12623013
    • 2009-11-20
    • Wesley W. WaldRobert J. GenslakEdward StutevilleIgor Anilovich
    • Wesley W. WaldRobert J. GenslakEdward StutevilleIgor Anilovich
    • F01N11/00
    • F01N11/00F01N3/10F01N2430/06F01N2560/025F01N2900/1621Y02T10/47
    • A diagnostic system for an exhaust system of an engine includes a fuel control module and a diagnostic module. The fuel control module, in response to a request for a fuel inhibiting event, operates the engine in a first rich condition for a first period until a catalytic converter of the exhaust system is in a predetermined first rich state and subsequently operates the engine in a lean condition for a second period contiguous with the first period. The diagnostic module determines a catalyst efficiency of the catalytic converter based on an output of an oxygen sensor located downstream of said catalytic converter during the second period, and selectively adjusts a diagnostic status of the catalytic converter based on a comparison of the catalyst efficiency and a predetermined catalyst efficiency. The fuel inhibiting event may be a deceleration fuel-cutoff event. A related diagnostic method is also provided.
    • 用于发动机排气系统的诊断系统包括燃料控制模块和诊断模块。 燃料控制模块响应于燃料抑制事件的请求,在第一浓缩状态下操作发动机持续第一时间段,直到排气系统的催化转化器处于预定的第一富集状态,并随后将发动机运行在 贫困状况与第一个周期相邻的第二个时期。 诊断模块基于在第二时段期间位于所述催化转化器下游的氧传感器的输出来确定催化转化器的催化剂效率,并且基于催化剂效率和催化剂效率的比较来选择性地调节催化转化器的诊断状态 预定的催化剂效率。 燃料抑制事件可以是减速燃料切断事件。 还提供了相关的诊断方法。