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1.发明授权公开(公告)号：US07597091B2
公开(公告)日：2009-10-06
申请号：US12213064
申请日：2008-06-13
申请人： Yusuke Suzuki , Yasushi Iwazaki , Toru Kidokoro , Hiroshi Sawada , Fumihiko Nakamura , Keiichiro Aoki
发明人： Yusuke Suzuki , Yasushi Iwazaki , Toru Kidokoro , Hiroshi Sawada , Fumihiko Nakamura , Keiichiro Aoki
IPC分类号： F02D41/14
CPC分类号： F02D41/1495 , F02D41/008 , F02D41/1441 , F02D41/1454 , F02D41/1498 , F02D2041/147
摘要： When an internal combustion engine including a plurality of cylinders is operating steadily, an index value relating to an actual hydrogen content in exhaust gas downstream of a portion where exhaust passages from the cylinders merge, and upstream of a catalyst is detected. When an index value relating to the actual hydrogen content in the exhaust gas is larger than a determination index value relating to a hydrogen content corresponding to a permissible limit of air-fuel ratio variation, it is determined that there is abnormal air-fuel ratio variation between the cylinders.
摘要翻译： 当包括多个气缸的内燃机工作稳定时，检测与在气缸的排气通道合流的部分下游以及催化剂上游相关的排气中的实际氢含量的指标值。 当与废气中的实际氢含量相关的指标值大于与空燃比变化的允许极限相对应的氢含量的判定指标值时，判断为存在异常空燃比变动 在气缸之间。
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公开(公告)号：US20090037079A1
公开(公告)日：2009-02-05
申请号：US12213064
申请日：2008-06-13
申请人： Yusuke Suzuki , Yasushi Iwazaki , Toru Kidokoro , Hiroshi Sawada , Fumihiko Nakamura , Keiichiro Aoki
发明人： Yusuke Suzuki , Yasushi Iwazaki , Toru Kidokoro , Hiroshi Sawada , Fumihiko Nakamura , Keiichiro Aoki
IPC分类号： F02D41/00
CPC分类号： F02D41/1495 , F02D41/008 , F02D41/1441 , F02D41/1454 , F02D41/1498 , F02D2041/147
摘要： When an internal combustion engine including a plurality of cylinders is operating steadily, an index value relating to an actual hydrogen content in exhaust gas downstream of a portion where exhaust passages from the cylinders merge, and upstream of a catalyst is detected. When an index value relating to the actual hydrogen content in the exhaust gas is larger than a determination index value relating to a hydrogen content corresponding to a permissible limit of air-fuel ratio variation, it is determined that there is abnormal air-fuel ratio variation between the cylinders.
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3.发明授权公开(公告)号：US08401765B2
公开(公告)日：2013-03-19
申请号：US13516841
申请日：2009-12-18
CPC分类号： F02D41/0085 , F02D41/1454 , F02D41/1494 , F02D41/1498 , F02D2250/14
摘要： An inter-cylinder air-fuel ratio imbalance determination apparatus that obtains, based on an output value Vabyfs of an air-fuel ratio sensor, an air-fuel ratio fluctuation indicating amount (AFD) which becomes larger as an air-fuel ratio fluctuation of an exhaust gas passing through a position at which the air-fuel ratio sensor is disposed becomes larger, during a parameter obtaining period. The determination apparatus estimates an air-fuel ratio sensor element temperature (Temps) having a strong relation with responsiveness of the air-fuel ratio sensor during the parameter obtaining period, and obtains a corrected air-fuel ratio fluctuation indicating amount by correcting the AFD based on the estimated Temps. The determination apparatus adopts the corrected air-fuel ratio fluctuation indicating amount as the imbalance determination parameter X, and determines whether or not an inter-cylinder air-fuel-ratio imbalance state has been occurring based on a comparison between the imbalance determination parameter X and the imbalance determination threshold Xth.
摘要翻译： 一种空转燃料比不平衡确定装置，其基于空燃比传感器的输出值Vabyfs，获得作为空燃比变动的空燃比变动指数（AFD）变大的空燃比变动指示量 在参数获取期间，通过设置有空燃比传感器的位置的排气变大。 确定装置估计在参数获取期间与空燃比传感器的响应性有很强关系的空燃比传感器元件温度（Temps），并且通过校正AFD来获得经校正的空燃比波动指示量 在估计的Temps。 确定装置采用校正的空燃比变动指示量作为不平衡判定参数X，并且基于不平衡确定参数X与不平衡确定参数X之间的比较来确定是否已经发生了缸间空燃比不平衡状态 不平衡判定阈值Xth。
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4.发明申请公开(公告)号：US20120277980A1
公开(公告)日：2012-11-01
申请号：US13516841
申请日：2009-12-18
CPC分类号： F02D41/0085 , F02D41/1454 , F02D41/1494 , F02D41/1498 , F02D2250/14
摘要： An inter-cylinder air-fuel ratio imbalance determination apparatus that obtains, based on an output value Vabyfs of an air-fuel ratio sensor, an air-fuel ratio fluctuation indicating amount (AFD) which becomes larger as an air-fuel ratio fluctuation of an exhaust gas passing through a position at which the air-fuel ratio sensor is disposed becomes larger, during a parameter obtaining period. The determination apparatus estimates an air-fuel ratio sensor element temperature (Temps) having a strong relation with responsiveness of the air-fuel ratio sensor during the parameter obtaining period, and obtains a corrected air-fuel ratio fluctuation indicating amount by correcting the AFD based on the estimated Temps. The determination apparatus adopts the corrected air-fuel ratio fluctuation indicating amount as the imbalance determination parameter X, and determines whether or not an inter-cylinder air-fuel-ratio imbalance state has been occurring based on a comparison between the imbalance determination parameter X and the imbalance determination threshold Xth.
摘要翻译： 一种空转燃料比不平衡确定装置，其基于空燃比传感器的输出值Vabyfs，获得作为空燃比变动的空燃比变动指数（AFD）变大的空燃比变动指示量 在参数获取期间，通过设置有空燃比传感器的位置的排气变大。 确定装置估计在参数获取期间与空燃比传感器的响应性有很强关系的空燃比传感器元件温度（Temps），并且通过校正AFD来获得经校正的空燃比波动指示量 在估计的Temps。 确定装置采用校正的空燃比变动指示量作为不平衡判定参数X，并且基于不平衡确定参数X与不平衡确定参数X之间的比较来确定是否已经发生了缸间空燃比不平衡状态 不平衡判定阈值Xth。
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5.发明授权公开(公告)号：US08401766B2
公开(公告)日：2013-03-19
申请号：US13514764
申请日：2009-12-09
IPC分类号： G06F19/00 , F02D41/14 , G01N27/407
CPC分类号： F02D41/0085 , F02D41/1454 , F02D41/1494 , F02D2250/14
摘要： An inter-cylinder air-fuel ratio imbalance determination apparatus (determination apparatus) according to the present invention obtains, based on the output value of the air-fuel ratio sensor, an imbalance determination parameter which becomes larger as an air-fuel ratio fluctuation of an exhaust gas passing through a position at which the air-fuel ratio sensor is disposed becomes larger, during a parameter obtaining period. The determination apparatus energizes the heater of the air-fuel ratio sensor in such a manner that a temperature of the air-fuel ratio element during the parameter obtaining period is higher than a temperature of the air-fuel ratio element during a period other than the parameter obtaining period. Accordingly, the imbalance determination parameter is obtained while the responsiveness of the air-fuel ratio sensor is high, and thus, the inter-cylinder air-fuel-ratio imbalance determination having a high accuracy can be made.
摘要翻译： 根据本发明的气缸内空燃比不平衡判定装置（判定装置），基于空燃比传感器的输出值，获得作为空燃比变动的空气比变动变大的不平衡判定参数 在参数获取期间，通过设置有空燃比传感器的位置的排气变大。 确定装置使空燃比传感器的加热器通电，使得参数获取期间的空燃比元件的温度比空燃比元件的温度高于空燃比元件的温度 参数获取期。 因此，在空燃比传感器的响应性高的同时获得不平衡确定参数，因此，可以进行具有高精度的气缸间空燃比不平衡确定。
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6.发明申请公开(公告)号：US20120323466A1
公开(公告)日：2012-12-20
申请号：US13514764
申请日：2009-12-09
CPC分类号： F02D41/0085 , F02D41/1454 , F02D41/1494 , F02D2250/14
摘要： An inter-cylinder air-fuel ratio imbalance determination apparatus (determination apparatus) according to the present invention obtains, based on the output value of the air-fuel ratio sensor, an imbalance determination parameter which becomes larger as an air-fuel ratio fluctuation of an exhaust gas passing through a position at which the air-fuel ratio sensor is disposed becomes larger, during a parameter obtaining period. The determination apparatus energizes the heater of the air-fuel ratio sensor in such a manner that a temperature of the air-fuel ratio element during the parameter obtaining period is higher than a temperature of the air-fuel ratio element during a period other than the parameter obtaining period. Accordingly, the imbalance determination parameter is obtained while the responsiveness of the air-fuel ratio sensor is high, and thus, the inter-cylinder air-fuel-ratio imbalance determination having a high accuracy can be made.
摘要翻译： 根据本发明的气缸内空燃比不平衡判定装置（判定装置），基于空燃比传感器的输出值，获得作为空燃比变动的空气比变动变大的不平衡判定参数 在参数获取期间，通过设置有空燃比传感器的位置的排气变大。 确定装置使空燃比传感器的加热器通电，使得参数获取期间的空燃比元件的温度比空燃比元件的温度高于空燃比元件的温度 参数获取期。 因此，在空燃比传感器的响应性高的同时获得不平衡确定参数，因此能够进行高精度的气缸间空燃比不平衡判定。
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公开(公告)号：US09850840B2
公开(公告)日：2017-12-26
申请号：US14900792
申请日：2013-06-26
CPC分类号： F02D41/126 , F01N3/08 , F01N13/009 , F01N2560/025 , F01N2560/14 , F01N2900/0416 , F02D41/1439 , F02D41/1441 , F02D41/1456 , F02D41/1495
摘要： An electronic control unit (ECU) of an internal combustion engine, which includes an air-fuel ratio sensor arranged at a downstream side of an exhaust purification catalyst, is configured to judge if a state of the air-fuel ratio sensor is normal or abnormal based on the first characteristic of change of air-fuel ratio and, if a judgment cannot be made based on the first characteristic, the ECU is configured to judge if the state of the air-fuel ratio sensor is normal or abnormal based on a 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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8.发明申请公开(公告)号：US20120232773A1
公开(公告)日：2012-09-13
申请号：US13509372
申请日：2009-11-12
IPC分类号： F02D41/26
CPC分类号： F02D41/0085 , F02D41/1441 , F02D41/1455
摘要： An inter-cylinder air-fuel ratio imbalance determination apparatus (determination apparatus) according to the present invention obtains, based on the output value of the air-fuel ratio sensor 67, an air-fuel ratio fluctuation indicating amount whose absolute value becomes larger as a fluctuation of the air-fuel ratio of the exhaust gas passing through a position at which the air-fuel ratio sensor is disposed becomes larger, and further obtains an imbalance determination parameter which becomes larger as an absolute value of the air-fuel ratio fluctuation indicating amount becomes larger. In addition, the determination apparatus obtains an average value of the air-fuel ratio of the exhaust gas during a period in which the imbalance determination parameter is being obtained, and obtains an imbalance determination threshold which becomes smaller as the average value of the air-fuel ratio is closer to the stoichiometric air-fuel ratio. The determination apparatus determines that an inter-cylinder air-fuel ratio imbalance state has been occurring when the imbalance determination parameter is larger than the imbalance determination threshold.
摘要翻译： 根据本发明的气缸内空燃比不平衡判定装置（判定装置），基于空燃比传感器67的输出值，求出绝对值变大的空燃比变动指示量 通过设置空燃比传感器的位置的废气的空燃比的波动变大，进而获得作为空燃比变动的绝对值变大的不平衡判定参数 指示量变大。 此外，确定装置获得在获得不平衡确定参数的时段期间的排气的空燃比的平均值，并且获得作为空气 - 燃料的平均值变小的不平衡确定阈值， 燃料比接近化学计量空燃比。 当不平衡确定参数大于不平衡确定阈值时，确定装置确定已经发生了缸间空燃比不平衡状态。
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9.发明申请公开(公告)号：US20110271665A1
公开(公告)日：2011-11-10
申请号：US13144194
申请日：2009-11-26
CPC分类号： F02D41/0085 , F02D41/1441 , F02D41/1454 , F02D41/1475 , G01N27/419
摘要： An air-fuel ratio imbalance among cylinders determining apparatus (a determining apparatus) according to an aspect of the present invention, obtains a parameter X for imbalance determination which becomes larger as a variation of an air-fuel ratio of an exhaust gas passing through a position at which the air-fuel ratio sensor is disposed becomes larger, based on an output value Vabyfs of an air-fuel ratio sensor 67. At the same time, the determining apparatus changes a target air-fuel ratio which is a target value of an air-fuel ratio of a mixture supplied to an engine to “an air-fuel ratio (a target rich air-fuel ratio AFrich or a target lean air-fuel ratio AFlean) other than a stoichiometric air-fuel ratio” from the stoichiometric air-fuel ratio. Accordingly, the determining apparatus can obtain the parameter X for imbalance determination in a state in which a responsivity of the air-fuel ratio sensor 67 is not low. As a result, it can make a determination on the air-fuel ratio imbalance among cylinders with high accuracy.
摘要翻译： 根据本发明的一个方面的气缸确定装置（确定装置）之间的空燃比不平衡获得作为不平衡确定的参数X随着通过的排气的空燃比的变化而变大 基于空燃比传感器67的输出值Vabyfs，设置空燃比传感器的位置变大。同时，确定装置将作为目标值的目标空燃比 向发动机供给的混合物的空燃比为“理论空燃比以外的理论空燃比以外的空燃比（目标浓空燃比AFrich或目标稀空燃比AFlean）” 空燃比。 因此，在空燃比传感器67的响应度不低的状态下，确定装置可以获得用于不平衡确定的参数X. 因此，可以高精度地确定气缸之间的空燃比不平衡。
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10.发明授权Air-fuel ratio imbalance among cylinders determining apparatus for an internal combustion engine 有权用于内燃机的气缸确定装置之间的空燃比不平衡公开(公告)号：US09194315B2
公开(公告)日：2015-11-24
申请号：US13144194
申请日：2009-11-26
IPC分类号： F01N3/10 , G01N7/00 , F02D41/00 , G01N27/419 , F02D41/14
CPC分类号： F02D41/0085 , F02D41/1441 , F02D41/1454 , F02D41/1475 , G01N27/419
摘要： An air-fuel ratio imbalance among cylinders determining apparatus (a determining apparatus) according to an aspect of the present invention, obtains a parameter X for imbalance determination which becomes larger as a variation of an air-fuel ratio of an exhaust gas passing through a position at which the air-fuel ratio sensor is disposed becomes larger, based on an output value Vabyfs of an air-fuel ratio sensor 67. At the same time, the determining apparatus changes a target air-fuel ratio which is a target value of an air-fuel ratio of a mixture supplied to an engine to “an air-fuel ratio (a target rich air-fuel ratio AFrich or a target lean air-fuel ratio AFlean) other than a stoichiometric air-fuel ratio” from the stoichiometric air-fuel ratio. Accordingly, the determining apparatus can obtain the parameter X for imbalance determination in a state in which a responsivity of the air-fuel ratio sensor 67 is not low. As a result, it can make a determination on the air-fuel ratio imbalance among cylinders with high accuracy.
摘要翻译： 根据本发明的一个方面的气缸确定装置（确定装置）之间的空燃比不平衡获得作为不平衡确定的参数X随着通过的排气的空燃比的变化而变大 基于空燃比传感器67的输出值Vabyfs，设置空燃比传感器的位置变大。同时，确定装置将作为目标值的目标空燃比 向发动机供给的混合物的空燃比为“理论空燃比以外的理论空燃比以外的空燃比（目标浓空燃比AFrich或目标稀空燃比AFlean）” 空燃比。 因此，在空燃比传感器67的响应度不低的状态下，确定装置可以获得用于不平衡确定的参数X. 因此，可以高精度地确定气缸之间的空燃比不平衡。
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