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    Misfire-detecting system for internal combustion engines
    3.
    发明授权
    Misfire-detecting system for internal combustion engines 失效
    内燃机失火检测系统

    公开(公告)号：US5327867A

    公开(公告)日：1994-07-12

    申请号：US026055

    申请日：1993-03-03

    申请人： Takashi Hisaki ,  Yuichi Shimasaki ,  Shigeki Baba ,  Masaki Kanehiro ,  Takuji Ishioka ,  Shigeru Maruyama ,  Kazuhito Kakimoto ,  Masataka Chikamatsu ,  Shukoh Terata ,  Kenichi Maeda

    发明人： Takashi Hisaki ,  Yuichi Shimasaki ,  Shigeki Baba ,  Masaki Kanehiro ,  Takuji Ishioka ,  Shigeru Maruyama ,  Kazuhito Kakimoto ,  Masataka Chikamatsu ,  Shukoh Terata ,  Kenichi Maeda

    IPC分类号： F02P11/00 ,  F02P17/00 ,  F02P17/12 ,  F02P5/00

    CPC分类号： F02P17/12 ,  F02P11/00 ,  F02P2017/006 ,  F02P2017/125

    摘要： A misfire-detecting system for an internal combustion engine carries out self-diagnosis of the system. In the system, sparking voltage generated across a spark plug of a cylinder of the engine is detected, and the detected sparking voltage is compared with a first predetermined reference voltage value, and a time period is measured over which the detected sparking voltage exceeds the first predetermined reference voltage value. It is determined that a misfire occurred in the engine when the measured time period exceeds a predetermined time period value. It is determined whether the engine is in self-sustaining operation. When it is determined that the engine is in self-sustaining operation, it is determined whether the misfire-detecting system is abnormal. It is determined that the misfire-detecting system is abnormal when the detected sparking voltage is lower than a second reference voltage value. Alternatively or in combination, it is determined that the misfire-detecting system is abnormal when the detected sparking voltage has continued to be higher than a third predetermined reference voltage value over a predetermined time period.

    摘要翻译： 用于内燃机的失火检测系统执行系统的自我诊断。 在该系统中，检测在发动机气缸的火花塞之间产生的火花电压，并将检测到的火花电压与第一预定参考电压值进行比较，并且测量检测到的火花电压超过第一 预定参考电压值。 当测量的时间段超过预定时间段值时，确定发动机发生失火。 确定发动机是否处于自维持运行状态。 当确定发动机处于自维持操作时，确定失火检测系统是否异常。 当检测到的火花电压低于第二参考电压值时，确定失火检测系统异常。 或者或组合地，当在预定时间段内检测到的火花电压继续高于第三预定参考电压值时，确定失火检测系统异常。

    System for determining deterioration of catalysts of internal combustion engines
    10.
    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。