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    System for diagnosing engine exhaust gas purifying device and system for diagnosing sensor
    4.
    发明授权
    System for diagnosing engine exhaust gas purifying device and system for diagnosing sensor 失效
    用于诊断发动机废气净化装置的系统和用于诊断传感器的系统

    公开(公告)号：US5341642A

    公开(公告)日：1994-08-30

    申请号：US994344

    申请日：1992-12-21

    申请人： Nobuo Kurihara ,  Toshio Ishii ,  Takashi Mukaihira ,  Kazuya Kawano ,  Yutaka Takaku

    发明人： Nobuo Kurihara ,  Toshio Ishii ,  Takashi Mukaihira ,  Kazuya Kawano ,  Yutaka Takaku

    IPC分类号： F01N3/20 ,  F01N11/00 ,  F02D41/14 ,  F02D45/00 ,  G01M15/10 ,  F01N3/28

    CPC分类号： G01M15/104 ,  F01N11/007 ,  F01N2550/02 ,  Y02T10/47

    摘要： A system which is capable of diagnosing the deterioration condition of an engine exhaust gas purifying device has front and rear air/fuel ratio sensors for detecting the air/fuel ratio of the exhaust gas upstream and downstream of the catalyst, an autocorrelation function calculation for calculating the autocorrelation function .phi.xx of an output signal from the front air/fuel ratio sensor to output the maximum values (.phi.xx)max of the autocorrelation function .phi.xx at predetermined intervals, each maximum value (.phi.xx)max being in each of the predetermined intervals. A cross-correlation function calculator calculates the cross-correlation function .phi.xy between the output signals from the front and rear air/fuel ratio sensors to output the maximum values (.phi.xy)max of the mutual correlation function .phi.xy at predetermined intervals, each maximum value (.phi.xy)max being in each of the predetermined intervals therefore. The ratios between the maximum values (.phi.xy)max and (.phi.xx)max (successive deterioration index .PHI..sub.i) are calculated to determine the deterioration condition of the catalyst by comparing the ratio with a predetermined reference value.

    摘要翻译： 能够诊断发动机废气净化装置的劣化状态的系统具有前后空气/燃料比传感器，用于检测催化剂上游和下游的排气的空燃比，计算自相关函数 输出来自前方空气/燃料比传感器的输出信号的自相关函数phi xx，以预定间隔输出自相关函数phi xx的最大值（phi xx）max，每个最大值（phi xx）max分别为 预定间隔。 互相关函数计算器计算来自前后空气/燃料比传感器的输出信号之间的互相关函数phi xy，以预定间隔输出相互关联函数phi xy的最大值（phi xy）max，每个 因此，在每个预定间隔中的最大值（phi xy）max。 计算最大值（phi xy）max和（phi xx）max（连续劣化指数PHI i）之间的比率，以通过将比率与预定参考值进行比较来确定催化剂的劣化条件。

    Malfunction diagnosis apparatus for internal combustion engine
    8.
    发明授权
    Malfunction diagnosis apparatus for internal combustion engine 失效
    内燃机故障诊断装置

    公开(公告)号：US5557933A

    公开(公告)日：1996-09-24

    申请号：US302409

    申请日：1994-09-08

    申请人： Akihito Numata ,  Takashi Mukaihira ,  Toshio Ishii ,  Yutaka Takaku ,  Kazuya Kawano

    发明人： Akihito Numata ,  Takashi Mukaihira ,  Toshio Ishii ,  Yutaka Takaku ,  Kazuya Kawano

    IPC分类号： F01N3/20 ,  F01N11/00 ,  F02B77/08 ,  F02D41/14 ,  F02D41/22 ,  G01M15/04 ,  G01N27/26

    CPC分类号： F02D41/1495 ,  F01N11/007 ,  F02D41/222 ,  F01N2550/02 ,  F02D2041/1432 ,  F02D41/0235 ,  F02D41/1441 ,  Y02T10/40 ,  Y02T10/47

    摘要： Provided is an internal combustion engine malfunction diagnosis apparatus capable of diagnosing the deterioration of an internal combustion engine with a high accuracy and capable of diagnosing deterioration of a fluctuation factor detection section of the engine with a high accuracy in irrespective of the engine speed.According to one embodiment of the present invention, there is provided a malfunction diagnosis apparatus for an internal combustion engine comprises: a crank angle detection sensor for detecting a crank angle of the internal combustion engine; a fluctuation factor measurement means for measuring a state of a fluctuation factor of the internal combustion engine; an angular-based data sampling section for sampling data of an output signal from the fluctuation factor measurement means at a predetermined rotation angle of a crank shaft in accordance with a crank angle signal from the crank angle detection sensor; a malfunction judgement section for judging a malfunction of the internal combustion engine on the basis of data sampled by the angular-based data sampling section; a time-based data sampling section for sampling an output signal from the fluctuation factor measurement means at every lapse of a predetermined constant time; and a fluctuation factor measurement means deterioration judgement section for judging deterioration of the fluctuation factor measurement means on the basis of data sampled by the time-based data sampling section.

    摘要翻译： 提供一种内燃机故障诊断装置，其能够高精度地诊断内燃机的劣化，并能够高精度地诊断发动机的波动因数检测部的劣化，而与发动机转速无关。 根据本发明的一个实施例，提供了一种用于内燃机的故障诊断装置，包括：用于检测内燃机的曲柄角的曲柄角检测传感器; 用于测量内燃机的波动因数的状态的波动因数测量装置; 基于角度的数据采样部分，根据来自曲柄角检测传感器的曲柄角信号，以曲轴的预定旋转角度对来自波动因数测量装置的输出信号的数据进行采样; 故障判断部，根据由基于角度的数据取样部取样的数据，判定内燃机的故障; 时间数据采样部分，用于在每个经过预定的恒定时间时对来自波动因数测量装置的输出信号进行采样; 以及波动因数测量单元，根据由基于时间的数据采样单元采样的数据，判断波动因数测量单元的劣化。