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公开(公告)号：US20160290269A1
公开(公告)日：2016-10-06
申请号：US15083449
申请日：2016-03-29
发明人： Shuntaro OKAZAKI , Kenji SUZUKI , Hiroshi MIYAMOTO , Yuji MIYOSHI
CPC分类号： F02D41/1495 , F01N3/101 , F01N11/007 , F01N13/008 , F01N2550/00 , F01N2560/025 , F01N2610/03 , F01N2900/0408 , F01N2900/0416 , F01N2900/0418 , F01N2900/1402 , F01N2900/1624 , F02D41/0235 , F02D41/1408 , F02D41/1439 , F02D41/1454 , F02D41/1456 , F02D41/1475 , F02D41/2454 , F02D2200/0814 , Y02T10/47
摘要： An exhaust purification system comprising an exhaust purification catalyst, a downstream side air-fuel ratio sensor, and a control device performing air-fuel ratio control for controlling an air-fuel ratio of exhaust gas and abnormality diagnosis control for diagnosing the downstream side air-fuel ratio sensor. In the air-fuel ratio control, the control device alternately and repeatedly switches the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst between a rich air-fuel ratio and a lean air-fuel ratio. In the abnormality diagnosis control, the control device judges that the downstream side air-fuel ratio sensor has become abnormal when the air-fuel ratio of the exhaust gas is made the rich air-fuel ratio by the air-fuel control and the output air-fuel ratio of the downstream side air-fuel ratio sensor changes from an air-fuel ratio richer than a predetermined lean judged air-fuel ratio to an lean air-fuel ratio.
摘要翻译： 一种排气净化系统，包括排气净化催化剂，下游侧空燃比传感器和执行用于控制排气的空燃比的空燃比控制的控制装置和用于诊断排气净化催化剂的下游侧空燃比传感器的异常诊断控制， 燃油比传感器 在空燃比控制中，控制装置在浓空燃比与稀空燃比之间交替重复切换流入排气净化催化剂的废气的空燃比。 在异常诊断控制中，当通过空燃比控制将废气的空燃比变为浓空燃比时，控制装置判断为下游侧空燃比传感器变得异常 下游侧空燃比传感器的燃料比从比预定的稀薄空燃比更浓的空燃比变为稀空燃比。
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公开(公告)号：US20180179979A1
公开(公告)日：2018-06-28
申请号：US15846569
申请日：2017-12-19
IPC分类号： F02D41/22 , G01N27/407 , G01N27/416 , G01N27/409
CPC分类号： F02D41/222 , G01N27/4073 , G01N27/4077 , G01N27/409 , G01N27/4163 , G01N27/4175 , G01N33/0037 , Y02A50/245
摘要： An object is to estimate the responsiveness of an exhaust gas sensor with as high accuracy as possible and to determine abnormality in the responsiveness of the exhaust gas sensor accurately. A diagnosis apparatus for the exhaust gas sensor comprises a controller configured to perform oxygen concentration control to change the oxygen concentration in the exhaust gas, calculate a responsiveness index correlating with the responsiveness of the exhaust gas sensor by diving the largest value of an absolute change rate defined as the absolute value of the change rate of the output signal of the exhaust gas sensor during a reference period by the difference between the value of the output signal at the time when the absolute change rate becomes largest and the converged value of the output signal with the reference period, and estimate the responsiveness of said exhaust gas sensor on the basis of said responsiveness index.
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公开(公告)号：US20160377008A1
公开(公告)日：2016-12-29
申请号：US15110597
申请日：2015-01-08
发明人： Shuntaro OKAZAKI , Norihisa NAKAGAWA , Yuji YAMAGUCHI , Kenji SUZUKI , Hiroshi MIYAMOTO , Yasushi IWAZAKI
CPC分类号： F02D41/2454 , F01N3/0864 , F01N3/20 , F01N9/00 , F01N11/007 , F01N13/008 , F01N2570/16 , F01N2900/1624 , F02D41/0295 , F02D41/1441 , F02D41/1454 , F02D41/1474 , F02D41/2441 , F02D41/2477 , F02D41/26 , F02D2200/0814 , Y02T10/20 , Y02T10/47
摘要： The internal combustion engine comprises an exhaust purification catalyst able to store oxygen, and a downstream side air-fuel ratio sensor arranged at a downstream side of the exhaust purification catalyst in a direction of exhaust flow. The control system performs feedback control of an amount of fuel fed to a combustion chamber of the internal combustion engine so that an air-fuel ratio of exhaust gas flowing into the exhaust purification catalyst becomes a target air-fuel ratio and performs learning control to correct a parameter relating to the feedback control based on an air-fuel ratio of exhaust gas detected by the downstream side air-fuel ratio sensor. The target air-fuel ratio is alternately switched between a rich set air-fuel ratio and a lean set air-fuel ratio leaner. When a condition for learning acceleration, which is satisfied when it is necessary to accelerate correction of the parameter by the learning control, is satisfied, a rich degree of the rich set air-fuel ratio is increased. Therefore, there is provided an internal combustion engine able to suitably change the speed of updating the learning value.
摘要翻译： 内燃机包括能够存储氧的排气净化催化剂和排气净化催化剂的排气流的下游侧配置的下游侧空燃比传感器。 控制系统对进入内燃机的燃烧室的燃料量进行反馈控制，使得流入排气净化催化剂的排气的空燃比成为目标空燃比，并进行学习控制以校正 与基于由下游侧空燃比传感器检测出的废气的空燃比的反馈控制有关的参数。 目标空燃比在富空燃比和稀空燃比之间交替切换。 当需要通过学习控制来加速参数的校正时满足学习加速度的条件时，丰富的设定空燃比的浓度增加。 因此，提供能够适当地改变更新学习值的速度的内燃机。
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公开(公告)号：US20180142639A1
公开(公告)日：2018-05-24
申请号：US15864312
申请日：2018-01-08
CPC分类号： F02D41/1495 , F01N3/10 , F01N3/106 , F02D41/126 , F02D41/1439 , F02D41/1456 , F02D41/222 , G01N27/41
摘要： An internal combustion engine comprises an exhaust purification catalyst and an air-fuel ratio sensor 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. The diagnosis system calculates a first characteristic of change of air-fuel ratio at the time when the output air-fuel ratio first passes a first air-fuel ratio region leaner than a stoichiometric air-fuel ratio 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 including a stoichiometric air-fuel ratio. The diagnosis system diagnoses the abnormality of the air-fuel ratio sensor based on the first characteristic of change of air-fuel ratio and 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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公开(公告)号：US20160281622A1
公开(公告)日：2016-09-29
申请号：US15026015
申请日：2014-09-30
发明人： Hiroshi MIYAMOTO , Toru KIDOKORO , Yasushi IWAZAKI , Kenji SUZUKI
CPC分类号： F02D41/1475 , F01N3/2066 , F02D41/1441 , F02D41/1454 , F02D41/1495 , F02D41/222 , Y02T10/40
摘要： An abnormality diagnosis system which can judge a downstream side air-fuel ratio sensor to be normal accurately is provided. The abnormality diagnosis system of an air-fuel ratio sensor is provided with an exhaust purification catalyst, an upstream side air-fuel ratio sensor which is provided at an upstream side of the exhaust purification catalyst, a downstream side air-fuel ratio sensor which is provided at a downstream side of the exhaust purification catalyst, and a diagnosis device which uses the outputs of these air-fuel ratio sensors as the basis to diagnose abnormality of the downstream side air-fuel ratio sensor. The diagnosis device judges that the downstream side air-fuel ratio sensor is normal when a time counter which counts the time when the output air-fuel ratio of the upstream side air-fuel ratio sensor becomes a rich air-fuel ratio which is richer than the stoichiometric air-fuel ratio and the output air-fuel ratio of the downstream side air-fuel ratio sensor becomes a rich judgment reference air-fuel ratio which is richer than the stoichiometric air-fuel ratio or less becomes a predetermined judgment value which is larger than zero or more.
摘要翻译： 可以提供能够正确地判断下游侧空燃比传感器的异常诊断系统。 空燃比传感器的异常诊断系统设置有排气净化催化剂，设置在排气净化催化剂的上游侧的上游侧空燃比传感器，下游侧空燃比传感器， 设置在排气净化催化剂的下游侧，以及诊断装置，其使用这些空燃比传感器的输出作为诊断下游侧空燃比传感器的异常的基础。 当计时上游侧空燃比传感器的输出空燃比成为浓空燃比时的时间计数器，诊断装置判定下游侧空燃比传感器正常 下游侧空燃比传感器的化学计量空燃比和输出空燃比成为比理论空燃比更浓的判定基准空燃比，或更小成为规定的判定值， 大于零以上。
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公开(公告)号：US20160115893A1
公开(公告)日：2016-04-28
申请号：US14921198
申请日：2015-10-23
发明人： Hiroshi MIYAMOTO , Toru KIDOKORO , Yasushi IWAZAKI , Kenji SUZUKI , Koji IDE
IPC分类号： F02D41/14
CPC分类号： F02D41/1495 , F02D41/1441 , F02D41/1454 , F02D41/1494 , F02D41/222 , Y02T10/40
摘要： An abnormality diagnosis system of limit current type air-fuel ratio sensors comprises a current detecting part and a sensor temperature control device. The abnormality diagnosis system uses the current detecting part to detect the output current of the air-fuel ratio sensor when the air-fuel ratio is made the rich air-fuel ratio in the state where temperature of the air-fuel ratio is made the first temperature and when the air-fuel ratio is made the rich air-fuel ratio in the state where the temperature of the air-fuel ratio is made a second temperature higher than the first temperature. It is judged that the air-fuel ratio sensor is abnormal if the output current when the temperature of the air-fuel ratio sensor is the first temperature is larger than the output current when it is the second temperature by a predetermined value or more.
摘要翻译： 限流型空燃比传感器的异常诊断系统包括电流检测部和传感器温度控制装置。 异常诊断系统使用电流检测部来检测空燃比传感器的输出电流，在空燃比为空燃比的状态下，使空燃比成为浓空燃比 在使空燃比的温度比第一温度高的状态下使空燃比为浓空燃比。 如果当空燃比传感器的温度为第一温度时的输出电流大于其第二温度的预定值以上时的输出电流，则判断空燃比传感器异常。
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公开(公告)号：US20170342927A1
公开(公告)日：2017-11-30
申请号：US15537194
申请日：2015-11-09
发明人： Hiroshi MIYAMOTO , Toru KIDOKORO , Yasushi IWAZAKI , Kenji SUZUKI
CPC分类号： F02D41/1495 , F01M13/00 , F02D41/123 , F02D41/222 , F02D41/2416 , F02D2041/224 , F02D2250/08 , G01N33/007
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：US20160290266A1
公开(公告)日：2016-10-06
申请号：US15038133
申请日：2014-11-20
发明人： Hiroshi MIYAMOTO , Yasushi IWAZAKI , Toru KIDOKORO , Yuji MIYOSHI
IPC分类号： F02D41/14
CPC分类号： F02D41/1454 , F02D41/123 , F02D41/1441 , F02D41/1456 , F02D41/1495 , F02D41/222
摘要： An internal combustion engine comprises an exhaust purification catalyst arranged in an exhaust passage of the internal combustion engine; an upstream side air-fuel ratio sensor for detecting an air-fuel ratio of exhaust gas flowing into the exhaust purification catalyst; and a downstream side air-fuel ratio sensor for detecting an air-fuel ratio of exhaust gas flowing out from the exhaust purification catalyst. An abnormality diagnosis system of air-fuel ratio sensors judges that at least one of the air-fuel ratio sensors has become abnormal when a difference or ratio between an output value of said upstream side air-fuel ratio sensor and an output value of said downstream side air-fuel ratio sensor becomes outside a predetermined range of normal difference or predetermined range of normal ratio during atmospheric gas introduction control where the exhaust gas flowing into the exhaust purification catalyst becomes atmospheric gas.
摘要翻译： 内燃机包括布置在内燃机的排气通道中的排气净化催化剂; 用于检测流入排气净化催化剂的废气的空燃比的上游侧空燃比传感器; 以及下游侧空燃比传感器，用于检测从排气净化催化剂流出的废气的空燃比。 当空燃比传感器的异常诊断系统判断当上游侧空燃比传感器的输出值与所述下游侧空气比传感器的输出值的差或比时，空燃比传感器中的至少一个变得异常 在流入排气净化催化剂的排气变成气氛气体的气体导入控制中，侧面空燃比传感器成为正常差异的预定范围或正常比例的预定范围之外。
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公开(公告)号：US20160138506A1
公开(公告)日：2016-05-19
申请号：US14900645
申请日：2013-06-26
CPC分类号： F02D41/1495 , F01N3/10 , F01N11/007 , F01N13/009 , F01N2550/02 , F01N2900/0416 , F01N2900/1624 , F02D41/0295 , F02D41/123 , F02D41/1441 , F02D41/1454 , F02D2041/228 , F02D2200/0814 , F02D2200/0816 , Y02T10/47
摘要： An internal combustion engine comprises an exhaust purification catalyst arranged in an exhaust passage of the internal combustion engine and being able to store oxygen in inflowing exhaust gas and an air-fuel ratio sensor arranged at a downstream side of the exhaust purification catalyst in a direction of exhaust flow and detecting an air-fuel ratio of exhaust gas flowing out from the exhaust purification catalyst and stops or decreases a feed of fuel to a combustion chamber as fuel cut control. The abnormality diagnosis system calculates a characteristic of change of an air-fuel ratio based on an output air-fuel ratio output from the air-fuel ratio sensor at the time when the output air-fuel ratio first passes a part of an air-fuel ratio region of a stoichiometric air-fuel ratio or more after an end of the fuel cut control, and diagnoses abnormality of the air-fuel ratio sensor based on the characteristic of change of the air-fuel ratio. As a result, the diagnosis system can diagnose the abnormality of deterioration of response of the downstream side air-fuel ratio sensor when necessary without fail when performing fuel cut control.
摘要翻译： 一种内燃机，其特征在于，具备排气净化催化剂，该排气净化催化剂配置在内燃机的排气通路内，能够在流入排气中存储氧气，以及配置在排气净化催化剂的下游侧的空燃比传感器， 并且检测从排气净化催化剂流出的废气的空燃比，并且将作为燃料切断控制的燃料供给停止或减少到燃烧室。 异常诊断系统基于在输出空燃比首先通过空燃比的一部分时从空燃比传感器输出的输出空燃比来计算空燃比变化的特性 燃料切断控制结束后的化学计量空燃比以上的比率区域，并且基于空燃比变化的特性来诊断空燃比传感器的异常。 因此，当进行燃料切断控制时，诊断系统可以在需要时诊断下游侧空燃比传感器的响应恶化的异常。
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公开(公告)号：US20190093583A1
公开(公告)日：2019-03-28
申请号：US15536938
申请日：2015-11-10
发明人： Hiroshi MIYAMOTO , Toru KIDOKORO , Yasushi IWAZAKI , Kenji SUZUKI
摘要： An oil dilution rate calculation system of an internal combustion engine acquires a blowby gas flow ratio showing the ratio of the flow of blowby gas to the flow of gas to the combustion chamber and an output current of the air-fuel ratio sensor during fuel cut control in which the 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 the blowby gas passage and flowing to the downstream side of the throttle valve in the intake passage, and calculate an oil dilution rate based on the acquired blowby gas flow ratio and output current.
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