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    CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
    1.
    发明公开
    CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 有权

    公开(公告)号：EP2952721A4

    公开(公告)日：2016-01-27

    申请号：EP13873938

    申请日：2013-01-29

    Applicant: TOYOTA MOTOR CO LTD

    Inventor： HAYASHITA GO ,  AOKI KEIICHIRO

    IPC: F02D45/00 ,  F02D41/14 ,  G01N27/41

    CPC classification number: F02D41/1455 ,  F02D41/0235 ,  F02D41/1401 ,  F02D41/1441 ,  F02D41/1456 ,  F02D41/1473 ,  G01N27/41

    Abstract: This control device for an internal combustion engine is equipped with: an air/fuel ratio sensor (41) provided to the exhaust passage of an internal combustion engine; and an engine control device that controls the internal combustion engine on the basis of the sensor output current of the air/fuel ratio sensor. The air/fuel ratio sensor is equipped with: a gas chamber (51) to be measured, into which exhaust gas flows; a reference cell (61) for which the reference cell output current varies according to the air/fuel ratio of the exhaust gas inside the gas chamber to be measured; and a pump cell (60) that, according to the pump current, pumps oxygen into or out of the exhaust gas in the gas chamber to be measured. The reference cell is configured so that the applied voltage, at which the reference cell output current reaches zero, varies according to the air/fuel ratio of the exhaust gas in the gas chamber to be measured. The applied voltage in the reference cell is fixed at a constant voltage, said constant voltage being set to a voltage different to the voltage at which the reference cell output current reaches zero when the air/fuel ratio of the exhaust gas in the gas chamber to be measured is the stoichiometric air/fuel ratio.

    CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
    2.
    发明公开
    CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 有权

    公开(公告)号：EP2952722A4

    公开(公告)日：2016-01-20

    申请号：EP13874005

    申请日：2013-01-29

    Applicant: TOYOTA MOTOR CO LTD

    Inventor： HAYASHITA GO ,  AOKI KEIICHIRO

    IPC: F02D45/00 ,  F02D41/14 ,  G01N27/406 ,  G01N27/41

    CPC classification number: F02D41/1454 ,  F02D41/1401 ,  F02D41/1441 ,  F02D41/1456 ,  G01N27/4065 ,  G01N27/419

    Abstract: This control device for an internal combustion engine is equipped with: an air/fuel ratio sensor provided to the exhaust passage of an internal combustion engine; and an engine control device that controls the internal combustion engine according to the output of the air/fuel ratio sensor. The air/fuel ratio sensor is equipped with: a gas chamber to be measured, into which exhaust gas flows; a pump cell that pumps oxygen into or out of the gas chamber to be measured according to the pump current; and a reference cell of which the reference cell output current detected varies according to the air/fuel ratio inside the gas chamber to be measured. The reference cell is equipped with: a first electrode that is exposed to the exhaust gas in the gas chamber to be measured; a second electrode exposed to a reference atmosphere; and a solid electrolyte layer arranged between the electrodes. The air/fuel ratio sensor is equipped with: a reference cell voltage applying device that applies a sensor applied voltage between the electrodes; and a reference cell output current detection device that detects, as the reference cell output current, the current flowing between the electrodes.

    CATALYST DEGRADATION DETERMINATION SYSTEM
    3.
    发明公开
    CATALYST DEGRADATION DETERMINATION SYSTEM 审中-公开
    催化剂劣化确定系统

    公开(公告)号：EP2857663A4

    公开(公告)日：2016-01-13

    申请号：EP12877849

    申请日：2012-05-28

    Applicant: TOYOTA MOTOR CO LTD

    Inventor： AOKI KEIICHIRO ,  KITAURA KOICHI ,  HAYASHITA GO

    IPC: F02D45/00

    CPC classification number: F01N11/007 ,  F01N2550/02 ,  F01N2560/025 ,  F02D41/0235 ,  F02D41/1441 ,  F02D41/1454 ,  F02D41/1456 ,  F02D2200/0816 ,  G01M15/104 ,  Y02T10/47

    Abstract: A catalyst deterioration determination system for determining deterioration of an exhaust gas purification catalyst having a capability of storing oxygen determines deterioration of the exhaust gas purification catalyst on the basis of its oxygen storage capacity. The system includes an oxygen concentration sensor provided downstream of the catalyst and having characteristics by which as rich gas components in exhaust gas increase, the oxygen concentration sensor outputs a measurement value of the oxygen concentration corresponding to a richer air-fuel ratio. When determining deterioration, the system performs a rich shift mode in which the exhaust gas air-fuel ratio is shifted from a lean air-fuel ratio to a rich air-fuel ratio and a lean shift mode in which the exhaust gas air-fuel ratio is shifted from a rich air-fuel ratio to a lean air-fuel ratio by exhaust gas air-fuel ratio control means, based on the measurement value of the oxygen concentration sensor. The rate of change of the exhaust gas air-fuel ratio in at least the lean shift mode among the rich shift mode and the lean shift mode is limited to a predetermined rate of change or lower, and the rate of change of the exhaust gas air-fuel ratio in the rich shift mode is set higher than the rate of change of the exhaust gas air furl ratio in the lean shift mode.

    ABNORMALITY DIAGNOSIS SYSTEM FOR AIR-FUEL RATIO SENSOR
    7.
    发明公开
    ABNORMALITY DIAGNOSIS SYSTEM FOR AIR-FUEL RATIO SENSOR 审中-公开
    异位分析系统FÜREINEN LUFT-KRAFTSTOFF-VERHÄLTNIS-SENSOR

    公开(公告)号：EP3054135A4

    公开(公告)日：2016-10-19

    申请号：EP13895060

    申请日：2013-10-01

    Applicant: TOYOTA MOTOR CO LTD

    Inventor： MIYAMOTO HIROSHI ,  IWAZAKI YASUSHI ,  AOKI KEIICHIRO ,  KIDOKORO TORU

    IPC: F02D45/00 ,  F02D41/14 ,  F02D41/22 ,  G01N27/26

    CPC classification number: G01M15/104 ,  F02D41/1441 ,  F02D41/1445 ,  F02D41/1454 ,  F02D41/1456 ,  F02D41/1495

    Abstract: The abnormality diagnosis system of an air-fuel ratio sensor comprising an exhaust purification catalyst, an upstream side air-fuel ratio sensor provided at an upstream side of the exhaust purification catalyst, a downstream air-fuel ratio sensor provided at a downstream side of the exhaust purification catalyst, and a diagnosis device diagnosing the downstream air-fuel ratio sensor for abnormality based on outputs of these air-fuel ratio sensors. The diagnosis device judges that the downstream air-fuel ratio sensor suffers from an abnormality if the output air-fuel ratio of the upstream side air-fuel ratio sensor has become a rich air-fuel ratio richer than a stoichiometric air-fuel ratio, and the output air-fuel ratio of the downstream air-fuel ratio sensor air-fuel ratio has changed from an air-fuel ratio richer than a lean judged reference air-fuel ratio to an air-fuel ratio leaner than the lead judged reference air-fuel ratio. As a result, it is possible to accurately diagnose an abnormality of a downstream air-fuel ratio sensor when using an air-fuel ratio sensor as a downstream side sensor.

    Abstract translation: 一种空燃比传感器的异常诊断系统，包括排气净化催化剂，设置在排气净化催化剂的上游侧的上游侧空燃比传感器，设置在排气净化催化剂的下游侧的下游空燃比传感器 排气净化催化剂和基于这些空燃比传感器的输出诊断用于异常的下游空燃比传感器的诊断装置。 如果上游侧空燃比传感器的输出空燃比变成比理论空燃比更浓的浓空燃比，则诊断装置判断下游空燃比传感器发生异常， 下游空燃比传感器空燃比的输出空燃比从比稀薄判定基准空燃比更浓的空燃比变更为比导向判定基准空燃比简单的空燃比， 燃油比。 结果，当使用空燃比传感器作为下游侧传感器时，可以精确地诊断下游空燃比传感器的异常。

    INTERNAL-COMBUSTION-ENGINE DIAGNOSTIC DEVICE
    8.
    发明公开
    INTERNAL-COMBUSTION-ENGINE DIAGNOSTIC DEVICE 审中-公开
    诊断设备用于内燃机

    公开(公告)号：EP3015690A4

    公开(公告)日：2016-07-13

    申请号：EP13887651

    申请日：2013-06-26

    Applicant: TOYOTA MOTOR CO LTD

    Inventor： MIYAMOTO HIROSHI ,  MIYOSHI YUJI ,  IWAZAKI YASUSHI ,  KIDOKORO TORU ,  AOKI KEIICHIRO

    IPC: F02D41/22 ,  F02D41/12 ,  F02D41/14 ,  F02D45/00

    CPC classification number: F02D41/126 ,  F01N3/08 ,  F01N13/009 ,  F01N2560/025 ,  F01N2560/14 ,  F01N2900/0416 ,  F02D41/1439 ,  F02D41/1441 ,  F02D41/1456 ,  F02D41/1495

    Abstract: An internal combustion engine comprises an exhaust purification catalyst (20) and an air-fuel ratio sensor (41) arranged at a downstream side of the exhaust purification catalyst, stops or decreases a feed of fuel as fuel cut control, and controls an air-fuel ratio of exhaust gas to a rich air-fuel ratio after the end of the fuel cut control as post reset rich control. A first characteristic of change of air-fuel ratio at the time the output air-fuel ratio first passes a first air-fuel ratio region X and a second characteristic of change of air-fuel ratio at the time when the output air-fuel ratio first passes a second air-fuel ratio region Y different from the first air-fuel ratio region X are calculated. The diagnosis system judges any one of normality, abnormality, and whether a hold should be put on judgment for the state of the air-fuel ratio sensor, based on the first characteristic of change of air-fuel ratio and, if it is judged that a hold should be put on judgment, judges if the state of the air-fuel ratio sensor is normal or abnormal based on the second characteristic of change of air-fuel ratio. As a result, it is possible to suppress the effects of the change of state of the exhaust purification catalyst while accurately diagnosing the abnormality of deterioration of response of a downstream side air-fuel ratio sensor.

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