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    • 4. 发明申请
    • Control and Diagnostic Approach for Emission Control Device
    • 排放控制装置的控制和诊断方法
    • US20070256406A1
    • 2007-11-08
    • US11742806
    • 2007-05-01
    • Imad Hassan MakkiJames Michael KernsMichael James UhrichMichael Igor Kluzner
    • Imad Hassan MakkiJames Michael KernsMichael James UhrichMichael Igor Kluzner
    • F01N3/00F01N7/00
    • F01N11/007Y02T10/47
    • A system and method for engine control and diagnostics are described. The engine system may include an engine having a catalyst in the exhaust system, the exhaust system further having an exhaust gas oxygen sensor upstream of the catalyst and downstream of the catalyst. In one example, the method may include during a first operating mode in which catalyst diagnostics are not carried out, adjusting air-fuel ratio based on both the upstream and downstream exhaust gas oxygen sensors, where air-fuel ratio adjustment responsiveness to the downstream sensor is reduced as the catalyst performance degrades; and during a second operating mode that includes catalyst diagnostics, adjusting air-fuel ratio based on at least the downstream exhaust gas oxygen sensor, where said air-fuel ratio adjustment responsiveness to the downstream sensor is temporarily increased from said reduction generated during the first operating mode.
    • 描述了用于发动机控制和诊断的系统和方法。 发动机系统可以包括在排气系统中具有催化剂的发动机,排气系统还在催化剂的上游和催化剂的下游还具有排气氧传感器。 在一个示例中,该方法可以包括在不执行催化剂诊断的第一操作模式中,基于上游和下游排气氧传感器调节空燃比,其中空燃比调节对下游传感器的响应性 随着催化剂性能的降低而降低; 并且在包括催化剂诊断的第二操作模式期间,至少基于下游废气氧传感器调节空燃比,其中所述下游传感器的空燃比调整响应性暂时从第一操作期间产生的所述减小暂时增加 模式。
    • 10. 发明申请
    • Air/Fuel Imbalance Monitor Using an Oxygen Sensor
    • 使用氧传感器的空气/燃料不平衡监测器
    • US20090241925A1
    • 2009-10-01
    • US12055111
    • 2008-03-25
    • Ken John BehrHas R. PatelMichael Igor KluznerBob Roy Jentz
    • Ken John BehrHas R. PatelMichael Igor KluznerBob Roy Jentz
    • F02D41/00
    • F02D41/0082F02D41/0085F02D41/1443F02D41/1456F02D41/187
    • Air/fuel imbalance monitoring systems and methods for monitoring air/fuel ratio imbalance of an internal combustion engine having a plurality of engine cylinders are provided herein. An example of the method may include routing exhaust gas from a first group of cylinders to an exhaust gas oxygen sensor, and during selected operating conditions, indicating that air/fuel of at least one cylinder in the first group is imbalanced based on a response of the exhaust gas oxygen sensor at frequencies at or above firing frequency of the cylinders in the first group. An example of the system may include an exhaust gas oxygen sensor positioned in such a way that exhaust gas from the group of engine cylinders are routed to the exhaust gas oxygen sensor, and a controller configured to during selected operating conditions, indicate that air/fuel of at least one cylinder in the group is imbalanced based on a response of the exhaust gas oxygen sensor at frequencies at or above firing frequency of the cylinders in the group.
    • 本文提供了用于监测具有多个发动机气缸的内燃机的空气/燃料不平衡监测系统和用于监测空/燃比不平衡的方法。 该方法的示例可以包括将废气从第一组气缸排向排气氧传感器,并且在选定的操作条件期间,指示第一组中的至少一个气缸的空气/燃料基于 排气氧传感器在第一组中的气缸的点火频率以上的频率。 系统的示例可以包括排气氧传感器,其被定位成使得来自一组发动机气缸的排气被引导到排气氧传感器,并且配置成在选择的操作条件期间的控制器指示空气/燃料 该组中的至少一个气缸基于排气氧传感器在组中的气缸的点火频率以上的频率的响应而不平衡。