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    Combustion state-detecting system for internal combustion engines
    1.
    发明授权
    Combustion state-detecting system for internal combustion engines 失效
    内燃机燃烧状态检测系统

    公开(公告)号：US5415035A

    公开(公告)日：1995-05-16

    申请号：US118679

    申请日：1993-09-10

    申请人： Yuichi Shimasaki ,  Kazutomo Sawamura ,  Kenichi Maeda ,  Shigetaka Kuroda

    发明人： Yuichi Shimasaki ,  Kazutomo Sawamura ,  Kenichi Maeda ,  Shigetaka Kuroda

    IPC分类号： F02D45/00 ,  F02B75/02 ,  G01M15/11 ,  G01M15/00

    CPC分类号： G01M15/11 ,  F02B2075/027

    摘要： A combustion state-detecting system, for internal combustion engines, has a crank angle sensor. The crank angle sensor generates a crank angle signal with a predetermined period shorter than a firing period of the engine whenever the crankshaft rotates through a predetermined angle. A value of the rotational speed of the engine is detected whenever the crank angle signal is generated. A first average value of the detected engine rotational speed is calculated over a period of one rotation of the crankshaft, followed by calculating a second average value of the first average value over every firing period, to thereby calculate a rate of variation in the second average value over every firing period. The rate of variation is compared with a predetermined value, to determine whether or not the engine is in a degraded state of combustion.

    摘要翻译： 用于内燃机的燃烧状态检测系统具有曲柄角传感器。 每当曲轴旋转预定角度时，曲轴转角传感器产生比发动机的燃起时间短的预定时间段的曲轴转角信号。 每当产生曲轴转角信号时，检测发动机转速的值。 在曲轴的一次旋转的周期内计算检测到的发动机转速的第一平均值，然后计算每个点火期间的第一平均值的第二平均值，从而计算第二平均值的变化率 每个发射期间的价值。 将变化率与预定值进行比较，以确定发动机是否处于劣化的燃烧状态。

    Combustion state-detecting system for internal combustion engines
    2.
    发明授权
    Combustion state-detecting system for internal combustion engines 失效
    内燃机燃烧状态检测系统

    公开(公告)号：US5373732A

    公开(公告)日：1994-12-20

    申请号：US149921

    申请日：1993-11-10

    申请人： Shigetaka Kuroda ,  Kazutomo Sawamura ,  Kenichi Maeda ,  Yuichi Shimasaki

    发明人： Shigetaka Kuroda ,  Kazutomo Sawamura ,  Kenichi Maeda ,  Yuichi Shimasaki

    IPC分类号： F02D45/00 ,  G01M15/11 ,  G01M15/00

    CPC分类号： G01M15/11

    摘要： A combustion state-detecting system for an internal combustion engine calculates a first average speed by averaging the rotational speed of the engine over a time period corresponding to duration of one stroke of a cylinder, and a second average speed by averaging the rotational speed of the engine over a time period corresponding to duration of one cycle of all strokes of the cylinder. The system calculates a difference between the first average speed and the second average speed, and determines based on the difference whether or not the combustion state of the engine is abnormal.

    摘要翻译： 用于内燃机的燃烧状态检测系统通过在对应于气缸的一个行程的持续时间的时间段内对发动机的转速进行平均来计算第一平均速度，并且通过对发动机的转速进行平均来平均第二平均速度 发动机在对应于气缸的所有冲程的一个循环的持续时间的时间段内。 系统计算第一平均速度和第二平均速度之差，并且基于发动机的燃烧状态是否异常的差来确定。

    Combustion state-detecting system for internal combustion engines
    3.
    发明授权
    Combustion state-detecting system for internal combustion engines 失效
    内燃机燃烧状态检测系统

    公开(公告)号：US5390537A

    公开(公告)日：1995-02-21

    申请号：US149913

    申请日：1993-11-10

    申请人： Shigetaka Kuroda ,  Kenichi Maeda ,  Kazutomo Sawamura ,  Hiroshi Maruyama

    发明人： Shigetaka Kuroda ,  Kenichi Maeda ,  Kazutomo Sawamura ,  Hiroshi Maruyama

    IPC分类号： F02D45/00 ,  G01M15/11 ,  G01M15/00

    CPC分类号： G01M15/11

    摘要： A combustion state-detecting system for internal combustion engines has a crank angle sensor which generates a crank angle signal with a predetermined period shorter than a firing period of the spark plug whenever the crankshaft rotates through a predetermined angle. A value of the rotational speed of the engine is detected whenever the crank angle signal is generated. A rate of variation in the detected value of the rotational speed of the engine is calculated over the firing period of the spark plug, and an average value thereof is then calculated. The calculated average value of the variation rate is compared with the calculated variation rate, and a cumulative value of a difference between the calculated variation rate average value and the calculated variation rate is calculated when the calculated variation rate is on the larger deceleration side of the engine rotational speed with respect to the calculated variation rate average value. The calculated difference cumulative value is compared with a predetermined value to determine whether or not the engine is in a degraded combustion state, based on the comparison result.

    摘要翻译： 用于内燃机的燃烧状态检测系统具有曲柄角传感器，每当曲轴旋转预定角度时，其产生比火花塞的燃烧时间短的预定时段的曲柄角信号。 每当产生曲轴转角信号时，检测发动机转速的值。 在火花塞的点火期间计算发动机的转速的检测值的变化率，然后计算其平均值。 将所计算的变化率的平均值与计算出的变化率进行比较，计算出的变化率平均值与计算出的变化率之差的累计值，在计算出的变化率在 发动机转速相对于计算的变化率平均值。 将计算的差分累计值与预定值进行比较，以基于比较结果来确定发动机是否处于劣化燃烧状态。

    System for determining deterioration of catalysts of internal combustion engines
    7.
    发明授权
    System for determining deterioration of catalysts of internal combustion engines 失效
    用于确定内燃机催化剂劣化的系统

    公开(公告)号：US5325664A

    公开(公告)日：1994-07-05

    申请号：US961794

    申请日：1992-10-16

    申请人： Yasunari Seki ,  Toshihiko Sato ,  Katuhiro Kumagai ,  Hiroshi Maruyama ,  Yoichi Iwata ,  Tsuyoshi Takizawa ,  Kenichi Maeda ,  Shigetaka Kuroda ,  Masataka Chikamatsu ,  Shukoh Terata ,  Kazutomo Sawamura ,  Hajime Uto ,  Takuya Aoki ,  Makoto Kobayashi

    发明人： Yasunari Seki ,  Toshihiko Sato ,  Katuhiro Kumagai ,  Hiroshi Maruyama ,  Yoichi Iwata ,  Tsuyoshi Takizawa ,  Kenichi Maeda ,  Shigetaka Kuroda ,  Masataka Chikamatsu ,  Shukoh Terata ,  Kazutomo Sawamura ,  Hajime Uto ,  Takuya Aoki ,  Makoto Kobayashi

    IPC分类号： F01N11/00 ,  F01N13/02 ,  F02F3/26

    CPC分类号： F01N11/002 ,  F01N11/007 ,  F01N13/009 ,  F01N2550/02 ,  F01N2900/0422 ,  Y02T10/47

    摘要： A catalyst deterioration-determining system determines deterioration of a catalyst arranged in the exhaust passage of an internal combustion engine. An ECU is responsive to an output from an O.sub.2 sensor arranged upstream of the catalyst or outputs from O.sub.2 sensors arranged upstream and downstream of the catalyst for controlling the air-fuel ratio of a mixture supplied to the engine by means of an air-fuel ratio correction value (first air-fuel ratio control). When the engine is in a predetermined operating condition, the system effects changeover from the first air-fuel ratio control to a second air-fuel ratio control which is responsive to the output from the downstream O.sub.2 sensor for controlling the air-fuel ratio of the mixture by means of the air-fuel ratio correction value. After the changeover has been effected, a time period is measured which elapses from the time the second air-fuel ratio control causes a change in the air-fuel ratio correction value from a richer side to a leaner side or vice versa with respect to a stoichiometric air-fuel ratio to the time the output from the downstream O.sub.2 sensor is inverted from the richer side to the leaner side or vice versa with respect to the stoichiometric air-fuel ratio. It is determined that the catalyst is deteriorated, when the measured time period is shorter than the predetermined time period.

    摘要翻译： 催化剂劣化确定系统确定布置在内燃机的排气通道中的催化剂的劣化。 ECU响应于设置在催化剂上游的O 2传感器的输出或者从设置在催化剂上游和下游的O2传感器输出，用于通过空燃比控制供给发动机的混合物的空燃比 校正值（第一空燃比控制）。 当发动机处于预定的运行状态时，该系统实现从第一空燃比控制切换到第二空燃比控制，第二空燃比控制响应于来自下游O2传感器的输出，用于控制发动机的空燃比 通过空燃比校正值进行混合。 在切换已经实现之后，测量从第二空燃比控制引起空燃比校正值从更丰富侧到更瘦侧的变化时间经过的时间段，反之亦然 化学计量空燃比与下游O2传感器的输出相对于化学计量空燃比从更丰富的一侧反转到更稀的侧，反之亦然。 当测量的时间段短于预定时间段时，确定催化剂劣化。