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    Air-fuel ratio control system for internal combustion engines
    2.
    发明授权
    Air-fuel ratio control system for internal combustion engines 失效
    内燃机空燃比控制系统

    公开(公告)号：US5379591A

    公开(公告)日：1995-01-10

    申请号：US187724

    申请日：1994-01-28

    申请人： Yoichi Iwata ,  Naoki Iida ,  Tsuyoshi Takizawa ,  Yasunari Seki ,  Toshihiko Sato ,  Takayoshi Nakayama

    发明人： Yoichi Iwata ,  Naoki Iida ,  Tsuyoshi Takizawa ,  Yasunari Seki ,  Toshihiko Sato ,  Takayoshi Nakayama

    IPC分类号： F02D41/14 ,  F01N3/22

    CPC分类号： F02D41/1483 ,  F02D41/1441 ,  F02B2275/18 ,  F02D41/1456

    摘要： An air-fuel ratio control system for an internal combustion engine calculates an air-fuel ratio feedback control parameter by proportional-integral control using a proportional factor and an integral factor, based an output signal from a second air-fuel ratio sensor arranged in an exhaust passage at a location upstream of a catalytic converter. An air-fuel ratio correction amount is calculated based on the air-fuel ratio feedback control parameter and an output signal from a first air-fuel ratio sensor arranged in the exhaust passage at a location upstream of the catalytic converter. An inversion period of the output signal from the second air-fuel ratio sensor is measured, and the proportional factor is changed according to the inversion period measured.

    摘要翻译： 用于内燃机的空燃比控制系统基于来自布置在内燃机中的第二空燃比传感器的输出信号，使用比例因子和积分因子的比例积分控制来计算空燃比反馈控制参数 在催化转化器上游位置的排气通道。 基于空燃比反馈控制参数和布置在催化转化器上游的排气通道中的第一空燃比传感器的输出信号来计算空燃比校正量。 测量来自第二空燃比传感器的输出信号的反转周期，并且根据测量的反转周期改变比例因子。

    Abnormality-detecting device for internal combustion engines
    4.
    发明授权
    Abnormality-detecting device for internal combustion engines 失效
    内燃机异常检测装置

    公开(公告)号：US5396766A

    公开(公告)日：1995-03-14

    申请号：US98798

    申请日：1993-07-29

    申请人： Toshihiko Sato ,  Yoichi Iwata ,  Hiroshi Ito ,  Tsuyoshi Takizawa ,  Takayoshi Nakayama

    发明人： Toshihiko Sato ,  Yoichi Iwata ,  Hiroshi Ito ,  Tsuyoshi Takizawa ,  Takayoshi Nakayama

    IPC分类号： F02D41/14 ,  F01N11/00 ,  F02D41/22 ,  F01N3/20

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

    摘要： An abnormality-detecting device is provided for an internal combustion engine having first and second oxygen sensors arranged in the exhaust system at locations upstream and downstream of a catalytic converter. An ECU detects the degree of deterioration of the catalytic converter, based on an output from the second oxygen sensor, and sets a reference value for determining an abnormality in the engine, based on the detected degree of deterioration of the catalytic converter. The ECU compares between the set reference value and a value based on an output from the first oxygen sensor, and determines the abnormality in the engine, based on the result of the comparison. Upon detection of the abnormality, an LED is actuated to issue an alarm.

    摘要翻译： 在内燃机中设置异常检测装置，该内燃机具有在催化转化器的上游和下游位置排列在排气系统中的第一和第二氧传感器。 ECU根据第二氧传感器的输出，检测催化转化器的劣化程度，根据检测到的催化转化器的劣化，设定用于判定发动机异常的基准值。 ECU根据比较结果，比较设定基准值和基于第一氧传感器的输出的值，并确定发动机的异常。 一旦发现异常，LED被启动发出报警。

    Air-fuel ratio control system for internal combustion engines
    5.
    发明授权
    Air-fuel ratio control system for internal combustion engines 失效
    内燃机空燃比控制系统

    公开(公告)号：US5398501A

    公开(公告)日：1995-03-21

    申请号：US137433

    申请日：1993-10-15

    申请人： Hiroshi Ito ,  Yoichi Iwata ,  Takizawa Tsuyoshi ,  Toshihiko Sato ,  Naoki Iida ,  Takayoshi Nakayama

    发明人： Hiroshi Ito ,  Yoichi Iwata ,  Takizawa Tsuyoshi ,  Toshihiko Sato ,  Naoki Iida ,  Takayoshi Nakayama

    IPC分类号： F01N3/20 ,  F01N11/00 ,  F02D41/14 ,  F02D41/22

    CPC分类号： F02D41/1441 ,  F01N11/007 ,  F02D41/1475 ,  F01N2550/02 ,  F01N2900/0422 ,  Y02T10/47

    摘要： An air-fuel ratio control system for an internal combustion engine having a catalytic converter arranged in the exhaust system, a first air-fuel ratio sensor arranged upstream of the catalytic converter, and a second air-fuel ratio sensor arranged downstream of the catalytic converter, calculates an air-fuel ratio control variable, based on an output from the second air-fuel ratio sensor. An air-fuel ratio correction amount is calculated based on an output from the first air-fuel ratio sensor and the air-fuel ratio control variable. The air-fuel ratio of a mixture supplied to the engine is controlled based on the air-fuel ratio correction amount. The air-fuel ratio control variable is corrected in the rich direction such that the air-fuel ratio of the mixture supplied to the engine becomes richer, when deterioration of the catalytic converter is detected.

    摘要翻译： 一种用于内燃机的空燃比控制系统，其具有布置在排气系统中的催化转化器，布置在催化转化器上游的第一空燃比传感器和布置在催化转化器下游的第二空燃比传感器 根据来自第二空燃比传感器的输出，计算空燃比控制变量。 基于第一空燃比传感器的输出和空燃比控制变量来计算空燃比校正量。 基于空燃比校正量来控制供给到发动机的混合物的空燃比。 当检测到催化转化器的劣化时，空燃比控制变量在富方向上被校正，使得供给发动机的混合物的空燃比变得更加丰富。

    Catalyst deterioration-detecting system for internal combustion engines
    6.
    发明授权
    Catalyst deterioration-detecting system for internal combustion engines 失效
    内燃机用催化剂劣化检测系统

    公开(公告)号：US5381657A

    公开(公告)日：1995-01-17

    申请号：US183751

    申请日：1994-01-21

    申请人： Tsuyoshi Takizawa ,  Yasunari Seki ,  Yoichi Iwata ,  Toshihiko Sato ,  Takayoshi Nakayama

    发明人： Tsuyoshi Takizawa ,  Yasunari Seki ,  Yoichi Iwata ,  Toshihiko Sato ,  Takayoshi Nakayama

    IPC分类号： F02D41/14 ,  F01N3/20 ,  F01N11/00 ,  F02D41/22 ,  F02D45/00

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

    摘要： A catalyst deterioration-detecting system is provided for an internal combustion engine having an oxygen concentration sensor arranged in an exhaust system downstream of a catalyst provided therein. An electronic control unit (ECU) controls the air-fuel ratio of a mixture supplied to the engine in response to an output from the oxygen concentration sensor. The ECU detects a value of an inversion period with which the output from the oxygen concentration sensor is inverted with respect to a predetermined reference value. Operating parameter sensors detect a value of at least one operating parameter of the engine related to a flow rate of the exhaust gases in the exhaust system. The ECU determines whether the catalyst is deteriorated, based on the detected value of the inversion period and the detected value of the at least one operating parameter. The ECU corrects the value of the inversion period in dependence on the detected value of the at least one operating parameter.

    摘要翻译： 本发明提供一种催化剂劣化检测系统，该系统具有布置在设置在其中的催化剂下游的排气系统中的氧浓度传感器。 电子控制单元（ECU）响应于氧浓度传感器的输出控制供应到发动机的混合物的空燃比。 ECU检测氧浓度传感器的输出相对于规定的基准值反转的反转期间的值。 操作参数传感器检测与排气系统中废气的流量相关的发动机的至少一个操作参数的值。 ECU根据反转期间的检测值和至少一个运行参数的检测值，判定催化剂是否劣化。 ECU根据至少一个操作参数的检测值来校正反转周期的值。

    Air-fuel ratio sensor deterioration-detecting device for internal combustion engines
    7.
    发明授权
    Air-fuel ratio sensor deterioration-detecting device for internal combustion engines 失效
    用于内燃机的空燃比传感器劣化检测装置

    公开(公告)号：US5375416A

    公开(公告)日：1994-12-27

    申请号：US184048

    申请日：1994-01-21

    申请人： Yoichi Iwata ,  Toshihiko Sato ,  Yasunari Seki ,  Tsuyoshi Takizawa ,  Takayoshi Nakayama

    发明人： Yoichi Iwata ,  Toshihiko Sato ,  Yasunari Seki ,  Tsuyoshi Takizawa ,  Takayoshi Nakayama

    IPC分类号： F01N3/20 ,  F02D41/14 ,  F02D41/22 ,  F02D45/00 ,  F01N3/22

    CPC分类号： F02D41/1495

    摘要： An air-fuel ratio sensor deterioration-detecting device for an internal combustion engine having a catalytic converter arranged in the exhaust system, and first and second air-fuel ratio sensors arranged upstream and downstream of the catalytic converter respectively has an ECU which calculates an air-fuel ratio correction amount, based on outputs from the first air-fuel ratio sensors, and detects deterioration of the first air-fuel ratio sensor, based on the output from the first air-fuel ratio sensor. The ECU inhibits detection of deterioration of the first air-fuel ratio sensor when the air-fuel ratio correction amount falls outside a predetermined range.

    摘要翻译： 具有设置在排气系统中的催化转化器的内燃机的空燃比传感器劣化检测装置，分别位于催化转化器的上游和下游的第一和第二空燃比传感器分别具有计算空气的ECU - 燃料比校正量，基于来自第一空燃比传感器的输出，并且基于第一空燃比传感器的输出来检测第一空燃比传感器的劣化。 当空燃比校正量落在预定范围之外时，ECU禁止检测第一空燃比传感器的劣化。

    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。