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公开(公告)号：US10746077B2
公开(公告)日：2020-08-18
申请号：US16116256
申请日：2018-08-29
发明人： Koji Hagiwara , Yasushi Iwazaki , Toru Kidokoro , Hirotaka Saito
摘要： An exhaust gas sensor is diagnosed with high accuracy as much as possible while maintaining the function of an exhaust system of an internal combustion engine. In a diagnostic apparatus for an exhaust gas sensor which is applied to an internal combustion engine including an exhaust gas sensor, a fuel supplier, a controller configured to carry out predetermined fuel supply processing and predetermined oxygen concentration processing, and which diagnoses the exhaust gas sensor based on an output value thereof, provision is made for the controller that sets as a diagnostic output value a first output value, which is an output value at the side of the highest oxygen concentration in the output value of the exhaust gas sensor in a measurement period, and performs the diagnosis of the exhaust gas sensor based on the diagnostic output value, when predetermined fuel supply processing is carried out in the measurement period.
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公开(公告)号：US10066534B2
公开(公告)日：2018-09-04
申请号：US15248680
申请日：2016-08-26
摘要： The internal combustion engine comprises an exhaust purification catalyst 20, a downstream side sensor 41, an air-fuel ratio control unit, and an oxygen storage amount calculating unit for calculating the oxygen excess/deficiency of the inflowing exhaust gas in an air-fuel ratio maintenance time period and cumulatively adding the calculated oxygen excess/deficiency to calculate a maximum oxygen storage amount of the exhaust purification catalyst. The oxygen storage amount calculating unit uses a point of time that an absolute value of an output slope of the downstream side sensor finally becomes less than a threshold value in the air-fuel ratio maintenance time period as an end point of cumulative addition of the oxygen excess/deficiency. The threshold value is made larger when a maximum value of the absolute value of the output slope in the air-fuel ratio maintenance time period is relatively large compared to when the maximum value is relatively small.
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公开(公告)号：US09611776B2
公开(公告)日：2017-04-04
申请号：US14977916
申请日：2015-12-22
CPC分类号： F01N11/007 , F01N3/208 , F01N2550/02 , F01N2610/02 , F02D41/00 , F02D41/0235 , F02D41/0295 , F02D41/1441 , F02D41/1456 , F02D2200/0816 , Y02T10/24 , Y02T10/47
摘要： In an deterioration diagnosis device for the exhaust gas purification apparatus in which in a period of time in which inducement processing is carried out which is to induce a water-gas-shift-reaction in a catalyst disposed at the upstream side of the SCR catalyst, by changing an air fuel ratio of exhaust gas discharged from an internal combustion engine from a lean air fuel ratio into a predetermined rich air fuel ratio, an air fuel ratio of exhaust gas flowing into the SCR catalyst and an air fuel ratio of exhaust gas flowing out from the SCR catalyst are measured by the air fuel ratio sensors, respectively, so that deterioration of the SCR catalyst is diagnosed based on a difference between the measured values of these sensors, wherein an end time of the execution of the inducement processing is adjusted in such a manner that an amount of hydrogen oxidized in the SCR catalyst during the period of the execution of the inducement processing becomes constant.
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公开(公告)号：US10920704B2
公开(公告)日：2021-02-16
申请号：US15537194
申请日：2015-11-09
发明人： Hiroshi Miyamoto , Toru Kidokoro , Yasushi Iwazaki , Kenji Suzuki
摘要： An abnormality diagnosis system of an air-fuel ratio sensor acquires a blowby gas flow ratio showing a ratio of the flow of blowby gas to the flow of gas to a combustion chamber and an output current of an air-fuel ratio sensor during fuel cut control in which an internal combustion engine stops the feed of fuel to the combustion chamber and at a plurality of points of time of different flows of blowby gas passing through a blowby gas passage and flowing to the downstream side of a throttle valve in the intake passage, calculate an output current of the air-fuel ratio sensor corresponding to a blowby gas flow ratio smaller than the blowby gas flow ratios acquired at the plurality of points of time, based on the acquired blowby gas flow ratio and output current, and judge the air-fuel ratio sensor for abnormality based on the calculated output current.
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公开(公告)号：US10302002B2
公开(公告)日：2019-05-28
申请号：US15319450
申请日：2015-06-15
发明人： Koji Hagiwara , Toru Kidokoro , Yasushi Iwazaki , Taisuke Yoshida
IPC分类号： A61L9/00 , B62D25/10 , G01N33/497 , F02B43/08 , B03C3/68 , C01G56/00 , F01N11/00 , F01N3/08 , F01N3/20 , F01N9/00 , F02D41/02 , F02D41/14 , F01N13/00 , B01D53/94 , F02D41/40
摘要： The present invention provides a deterioration diagnosis apparatus for an exhaust gas purification apparatus, including a first sensor that measures the oxygen concentration of the exhaust gas flowing into the exhaust gas purification apparatus, a second sensor that measures the oxygen concentration of the exhaust gas flowing out of the exhaust gas purification apparatus, and diagnosing means for diagnosing deterioration of the exhaust gas purification apparatus on the basis of a difference that appears between a measurement value of the first sensor and a measurement value of the second sensor when the air-fuel ratio of the exhaust gas flowing into the exhaust pas purification apparatus is switched from a lean air-fuel ratio to a rich air-fuel ratio, wherein, when the air-fuel ratio of the exhaust gas is switched from a lean air-fuel ratio to a rich air-fuel ratio, a water-gas shift reaction is generated upstream of the first sensor.
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公开(公告)号：US10119446B2
公开(公告)日：2018-11-06
申请号：US15200327
申请日：2016-07-01
发明人： Koji Hagiwara , Toru Kidokoro , Yasushi Iwazaki , Hirotaka Saitoh , Yuji Miyoshi
摘要： A deterioration diagnosis apparatus for an exhaust gas purification apparatus according to the invention performs an induction process when an internal combustion engine is operating at a lean air-fuel ratio, measures the air-fuel ratio of the exhaust gas flowing into the SCR catalyst and the air-fuel ratio of the exhaust gas flowing out of the SCR catalyst by the air-fuel ratio sensor during the period through which the induction process is performed, and diagnoses deterioration of the SCR catalyst based on the difference between the air-fuel ratios thus measured. The diagnosis apparatus adjusts the quantity of reducing agent supplied to a hydrogen production catalyst during the period through which the induction process is performed, taking account of the degree of deterioration of the hydrogen production catalyst.
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公开(公告)号：US20170058749A1
公开(公告)日：2017-03-02
申请号：US15248680
申请日：2016-08-26
CPC分类号： F01N11/007 , F01N3/0864 , F01N3/101 , F01N3/20 , F01N11/005 , F01N13/08 , F01N2390/02 , F01N2550/02 , F01N2900/1402 , F01N2900/1602 , F01N2900/1624 , Y02T10/22 , Y02T10/47
摘要： The internal combustion engine comprises an exhaust purification catalyst 20, a downstream side sensor 41, an air-fuel ratio control unit, and an oxygen storage amount calculating unit for calculating the oxygen excess/deficiency of the inflowing exhaust gas in an air-fuel ratio maintenance time period and cumulatively adding the calculated oxygen excess/deficiency to calculate a maximum oxygen storage amount of the exhaust purification catalyst. The oxygen storage amount calculating unit uses a point of time that an absolute value of an output slope of the downstream side sensor finally becomes less than a threshold value in the air-fuel ratio maintenance time period as an end point of cumulative addition of the oxygen excess/deficiency. The threshold value is made larger when a maximum value of the absolute value of the output slope in the air-fuel ratio maintenance time period is relatively large compared to when the maximum value is relatively small.
摘要翻译： 内燃机包括排气净化催化剂20，下游侧传感器41，空燃比控制单元和氧气存储量计算单元，用于计算空燃比中的流入废气的氧过量/不足 维持时间段，并累计加入计算出的氧过剩/缺乏量，计算排气净化催化剂的最大氧气储存量。 氧气存储量计算单元使用下游侧传感器的输出斜率的绝对值最终变得小于空燃比维持时间段中的阈值的时间点作为氧的累积添加的终点 多余/不足 当空燃比维持时间段的输出斜率的绝对值的最大值相对于最大值相对较小时，阈值变大。
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公开(公告)号：US09512795B2
公开(公告)日：2016-12-06
申请号：US14510703
申请日：2014-10-09
发明人： Kenji Suzuki , Yasushi Iwazaki , Hiroshi Miyamoto
CPC分类号： F02D41/009 , F02D41/0085 , F02D41/1456 , G01M15/104
摘要： An apparatus includes an air-fuel ratio sensor installed in an exhaust passage common to a plurality of cylinders in a multicylinder internal combustion engine, and a control apparatus configured to detect an inter-cylinder air-fuel ratio variation abnormality based on a parameter correlated with a degree of variation in output from the air-fuel ratio sensor. The control apparatus is configured to calculate a division crank angle that bisects an area of a region present in at least one of a rich and a lean sides with respect to a mean value of an output waveform from the air-fuel ratio sensor during one cycle of the internal combustion engine or such a predetermined constant value as corresponds to a center of fluctuation in the output waveform and to identify an abnormal cylinder with a deviation of the air-fuel ratio based on the division crank angle.
摘要翻译： 一种装置，包括安装在多缸内燃机中与多个气缸共用的排气通道中的空燃比传感器，以及控制装置，其被配置为基于与气缸内空燃比变化异常相关的参数来检测气缸间空燃比变化异常 来自空燃比传感器的输出的变化程度。 控制装置被配置为计算分割曲柄角，该分割曲柄角相对于来自空燃比传感器的输出波形的平均值，在一个周期内将存在于丰富侧和偏侧中的至少一个中的区域的区域相等 或与输出波形的波动中心对应的预定常数值，并且基于分割曲柄角度来识别具有空燃比偏差的异常气缸。
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公开(公告)号：US20150226105A1
公开(公告)日：2015-08-13
申请号：US14613816
申请日：2015-02-04
发明人： Koji Hagiwara , Toru Kidokoro , Yasushi Iwazaki
IPC分类号： F01N11/00
CPC分类号： F01N11/007 , F01N3/0814 , F01N3/0842 , F01N3/0871 , F01N3/2066 , F01N13/009 , F01N2550/02 , Y02T10/20 , Y02T10/47
摘要： An object of the present invention is to detect an abnormality in an exhaust gas purification apparatus having an NSR catalyst and an SCR catalyst disposed on a downstream side of the NSR catalyst more favorably. Air-fuel ratio reduction control is executed to reduce NOx occluded to the NSR catalyst when an integrated value of an amount of NOx flowing into the NSR catalyst reaches an upper limit value of an amount of NOx that can be occluded to the NSR catalyst in a normal condition. It is determined whether or not the exhaust gas purification apparatus is in an abnormal state on the basis of a NOx purification ratio of the exhaust gas purification apparatus calculated at this time.
摘要翻译： 本发明的目的是更有利地检测具有NSR催化剂和设置在NSR催化剂的下游侧的SCR催化剂的废气净化装置的异常。 执行空燃比降低控制，以当流入NSR催化剂的NOx的量的积分值达到可以阻塞在NSR催化剂中的NOx的量的上限值时，可以减少吸入NSR催化剂的NOx 正常状况 基于此时计算出的废气净化装置的NOx净化率，判定废气净化装置是否处于异常状态。
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10.发明授权公开(公告)号：US08725387B2
公开(公告)日：2014-05-13
申请号：US13871249
申请日：2013-04-26
IPC分类号： B60T7/12
CPC分类号： F02D41/00 , F02D41/0042 , F02D41/0085 , F02D41/1454 , F02D41/2441 , F02D41/2454
摘要： An apparatus for determining an air-fuel ratio imbalance among cylinders based on an output value of an air-fuel ratio sensor, an imbalance determination parameter which becomes larger or smaller as a difference among air-fuel ratios becomes larger, and performs determining an air-fuel ratio imbalance among cylinders based on a result of a comparison between the imbalance determination parameter and a imbalance determination threshold. The determining apparatus calculates a purge correction coefficient which compensates for a change in the air-fuel ratio due to an evaporated fuel gas which is generated in a fuel tank, while the evaporated fuel gas is being introduced into an intake passage, and corrects a fuel injection amount with the purge correction coefficient FPG.
摘要翻译： 一种用于基于空燃比传感器的输出值来确定气缸之间的空燃比不平衡的装置，作为空燃比之差变大或变小的不平衡确定参数变大，并且执行空气 - 基于不平衡确定参数和不平衡确定阈值之间的比较的结果，气缸之间的燃料比不平衡。 确定装置计算净化校正系数，其补偿由于在燃料箱中产生的蒸发燃料气体而引起的空燃比的变化，同时蒸发的燃料气体被引入进气通道中，并且校正燃料 喷射量与净化校正系数FPG。
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