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    • 10. 发明授权
    • Method and system for monitoring a catalytic converter
    • 用于监测催化转化器的方法和系统
    • US06550237B1
    • 2003-04-22
    • US10065190
    • 2002-09-25
    • Andrew A. AdamczykChristian Thomas Goralski, Jr.Eva Thanasiu
    • Andrew A. AdamczykChristian Thomas Goralski, Jr.Eva Thanasiu
    • F01N300
    • F02D41/1458F01N11/007F01N2550/02F02D41/1441F02D41/1456F02D41/1474F02D41/1481F02D41/187F02D2200/0404Y02T10/47
    • A method and system are provided for monitoring exhaust gas conversion efficiency of a catalytic converter during operation of an internal combustion engine coupled to the catalytic converter. The system includes an upstream exhaust gas sensor interposed the engine and the catalytic converter for generating a first signal based on the exhaust gas upstream of the converter. A downstream exhaust gas sensor is interposed the catalytic converter and atmosphere for generating a second signal based on the exhaust gas downstream of the converter. A phase shift detector is provided for estimating a phase shift between the first and second signals. A processor is provided for aligning the first and second signals such that the resulting phase shift between the first and second signals is substantially an integer multiple of &pgr; radians and for determining conversion efficiency of the catalytic converter based such phase aligned first and second signals. With such method and system, average error of the calculated index ratio using such system and method and the theoretical average error in index ration (IR) is minimized when the phase shift between the upstream and downstream sensor signals is substantially an integer multiple of &pgr; radians.
    • 提供了一种方法和系统,用于监测催化转化器在与催化转化器耦合的内燃机操作期间的排气转化效率。 该系统包括插入发动机和催化转化器的上游废气传感器,用于基于转炉上游的排气产生第一信号。 下游废气传感器插入催化转化器和气氛,用于基于转炉下游的废气产生第二信号。 提供了一种用于估计第一和第二信号之间的相移的相移检测器。 提供了一种用于对准第一和第二信号的处理器,使得在第一和第二信号之间产生的相移基本上是π弧度的整数倍,并且用于确定基于这种相位对准的第一和第二信号的催化转换器的转换效率。 使用这种方法和系统,当上游和下游传感器信号之间的相移基本上是pi弧度的整数倍时,使用这种系统和方法的计算指数比率的平均误差和指数比(IR)的理论平均误差被最小化 。