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    Air-fuel ratio control system for internal combustion engines
    1.
    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。

    Air-fuel ratio control system for internal combustion engines
    3.
    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
    5.
    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。

    Catalyst deterioration-detecting system for internal combustion engines
    7.
    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
    8.
    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。

    Air-fuel ratio control system for internal combustion engines
    10.
    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：US5605041A

    公开(公告)日：1997-02-25

    申请号：US326391

    申请日：1994-10-20

    申请人： Yoichi Iwata ,  Yoshiharu Ave ,  Takayoshi Nakayama

    发明人： Yoichi Iwata ,  Yoshiharu Ave ,  Takayoshi Nakayama

    IPC分类号： F02D45/00 ,  F02D41/14 ,  F01N3/28

    CPC分类号： F02D41/1441 ,  F02D41/1456

    摘要： An air-fuel ratio control system for an internal combustion engine comprises upstream and downstream O2 sensors arranged in the exhaust system of the engine at respective locations upstream and downstream of a catalytic converter, for detecting concentration of oxygen in exhaust gases from the engine. An ECU sets a control variable having a value proportional to the difference between an output from the downstream O2 sensor and a first predetermined reference value, and compares between an output from the upstream O2 sensor and a second predetermined reference value, to thereby calculate an air-fuel ratio correction coefficient, based on results of comparison and the set control variable. The air-fuel ratio of an air-fuel mixture supplied to the engine is controlled based on the calculated air-fuel ratio correction coefficient.

    摘要翻译： 用于内燃机的空燃比控制系统包括在催化转化器的上游和下游的相应位置处布置在发动机的排气系统中的上游和下游O2传感器，用于检测来自发动机的废气中的氧气浓度。 ECU设置具有与下游O2传感器的输出与第一预定参考值之间的差成比例的值的控制变量，并且比较来自上游O 2传感器的输出和第二预定参考值，从而计算空气 - 燃料比率校正系数，基于比较结果和设定控制变量。 基于计算出的空燃比校正系数来控制供给发动机的空燃混合气的空燃比。