公开(公告)号：US20130036808A1

公开(公告)日：2013-02-14

申请号：US13642820

申请日：2010-04-23

申请人： Koichi Kitaura ,  Takahiko Fujiwara ,  Yuuji Miyoshi ,  Ryota Onoe

发明人： Koichi Kitaura ,  Takahiko Fujiwara ,  Yuuji Miyoshi ,  Ryota Onoe

IPC分类号： G01M15/10

CPC分类号： F02D41/1441 ,  F01N3/101 ,  F01N11/007 ,  F01N2560/025 ,  F01N2560/14 ,  F01N2900/0416 ,  F01N2900/1402 ,  F01N2900/1624 ,  F02D41/1475 ,  Y02T10/22 ,  Y02T10/47

摘要： Active air-fuel ratio control is performed to alternately control an air-fuel ratio in an area located upstream of a catalyst between a lean side and a rich side. Switching is carried out between lean control and rich control at the same time when an output from a post-catalyst sensor reaches a threshold. Whether the catalyst is normal or abnormal is determined based on the rate of a change in the output from the post-catalyst sensor between a first point of time when a pre-catalyst air-fuel ratio reaches stoichiometry after the output from the post-catalyst sensor reaches the threshold and a second point of time when the output from the post-catalyst sensor reaches the threshold next time.

摘要翻译： 执行主动空燃比控制以交替地控制位于贫侧和富侧之间的催化剂上游的区域中的空燃比。 在后催化剂传感器的输出达到阈值的同时，在稀薄控制和浓控制之间进行切换。 基于催化剂后传感器的输出的变化率，在催化剂后催化剂的输出后催化剂前空燃比达到化学计量的第一时间点之后，确定催化剂是正常还是异常 传感器达到阈值，而后催化剂传感器的输出下一次达到阈值的第二时间点。

公开(公告)号：US08359827B2

公开(公告)日：2013-01-29

申请号：US12677277

申请日：2009-02-24

申请人： Daisuke Shibata ,  Koichi Kitaura ,  Hiroshi Sawada ,  Tatsuya Tsuji

发明人： Daisuke Shibata ,  Koichi Kitaura ,  Hiroshi Sawada ,  Tatsuya Tsuji

IPC分类号： F01N3/00

CPC分类号： F01N3/025 ,  F01N9/002 ,  F01N11/002 ,  F01N2550/04 ,  F01N2900/0601 ,  F01N2900/1606 ,  Y02T10/47

摘要： The invention intends to provide a technology which makes it possible to diagnose with higher accuracy whether or not abnormality occurs in a filter regeneration system causing excessive execution frequency of a regeneration process. The filter regeneration system initiates execution of the regeneration process, incase an estimated particulate matter (PM) accumulation amount at the filter reaches a pre-determined regeneration requiring accumulation amount; or in case the pressure upstream of the filter or the differential pressure across the filter reaches a pre-determined regeneration requiring value, the value being larger than the pressure or the differential pressure corresponding to the regeneration requiring accumulation amount. Then, the diagnosis is carried out based on a ratio of an estimated PM accumulation amount at the initiation of the execution of the regeneration process to the regeneration requiring accumulation amount.

摘要翻译： 本发明旨在提供一种能够以更高精度诊断导致再生处理的过度执行频率的过滤器再生系统中发生异常的技术。 过滤器再生系统启动再生处理的执行，使得在过滤器处的估计的颗粒物质（PM）累积量达到预定的再生需要累积量; 或者在过滤器上游的压力或过滤器上的压差达到预定的再生需求值的情况下，该值大于对应于再生需要累积量的压力或压差。 然后，基于再生处理开始时的估计PM积累量与再生需求累积量的比例进行诊断。

公开(公告)号：US20080173008A1

公开(公告)日：2008-07-24

申请号：US12007564

申请日：2008-01-11

申请人： Toru Kidokoro ,  Koichi Kimura ,  Koichi Kitaura

发明人： Toru Kidokoro ,  Koichi Kimura ,  Koichi Kitaura

IPC分类号： F01N3/00 ,  F01N3/18 ,  F01N3/08

CPC分类号： F01N11/007 ,  F01N11/002 ,  F01N2550/02 ,  Y02T10/47

摘要： A catalyst deterioration detecting system of an internal combustion engine includes a measuring unit that measures the oxygen storage capacity of a catalyst, a detector that detects or estimates the temperature of the catalyst, and a detector that detects poisoning of the catalyst based on the relationship between a change in the catalyst temperature and a change in the oxygen storage capacity corresponding to the change in the catalyst temperature. The change in the oxygen storage capacity corresponding to the change in the catalyst temperature varies depending on the presence or absence of poisoning of the catalyst. Thus, the catalyst deterioration detecting system is able to favorably detect poisoning of the catalyst by utilizing this relationship, and distinguish temporary deterioration due to catalyst poisoning from permanent deterioration. A method of detecting deterioration of the catalyst is also provided.

摘要翻译： 内燃机的催化剂劣化检测系统包括测量催化剂的储氧能力的测量单元，检测或估计催化剂温度的检测器，以及检测催化剂中毒的检测器， 催化剂温度的变化和对应于催化剂温度变化的储氧能力的变化。 对应于催化剂温度变化的储氧容量的变化取决于催化剂是否存在中毒。 因此，催化剂劣化检测系统能够通过利用这种关系有利地检测催化剂的中毒，并且将由于催化剂中毒引起的暂时劣化区分为永久性劣化。 还提供了一种检测催化剂劣化的方法。

公开(公告)号：US09670819B2

公开(公告)日：2017-06-06

申请号：US14404340

申请日：2012-05-28

申请人： Keiichiro Aoki ,  Koichi Kitaura ,  Go Hayashita

发明人： Keiichiro Aoki ,  Koichi Kitaura ,  Go Hayashita

IPC分类号： F01N3/00 ,  F01N11/00 ,  F02D41/02 ,  G01M15/10 ,  F02D41/14

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

摘要： A catalyst deterioration determination system determines deterioration of an exhaust gas purification catalyst on the basis of its oxygen storage capacity. The system includes a downstream oxygen concentration sensor 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. The system performs a rich shift mode and a lean shift mode 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 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 fuel ratio in the lean shift mode.

公开(公告)号：US08683856B2

公开(公告)日：2014-04-01

申请号：US13642398

申请日：2010-04-23

申请人： Koichi Kitaura

发明人： Koichi Kitaura

IPC分类号： F01N11/00

CPC分类号： F01N11/007 ,  F01N3/101 ,  F01N2550/02 ,  F01N2560/025 ,  F01N2900/0412 ,  F01N2900/0416 ,  F01N2900/0422 ,  F01N2900/1402 ,  F01N2900/1624 ,  F02D41/0295 ,  F02D41/1441 ,  F02D41/1456 ,  F02D41/1475 ,  F02D2200/0814 ,  Y02T10/22 ,  Y02T10/47

摘要： Active air-fuel ratio control is performed to alternately control an air-fuel ratio in an area located upstream of a catalyst between a lean side and a rich side. The amount of oxygen absorbed and released by the catalyst during lean control and rich control of the air-fuel ratio is measured. When an output from the post-catalyst sensor reaches a predetermined threshold, switching is carried out between the lean control and the rich control, and the measurement of the amount of oxygen is ended. The threshold is set to be reached before the output from the post-catalyst sensor reaches a predetermined reference value. Whether the catalyst is normal or abnormal is determined based on the amount of oxygen measured until the output from the post-catalyst sensor reaches the threshold and behavior of the output from the post-catalyst sensor observed after the output from the post-catalyst sensor reaches the threshold.

摘要翻译： 执行主动空燃比控制以交替地控制位于贫侧和富侧之间的催化剂上游的区域中的空燃比。 测量在稀薄控制期间由催化剂吸收和释放的氧的量和空燃比的丰富控制。 当来自催化后传感器的输出达到预定阈值时，在稀薄控制和浓控制之间进行切换，并且氧量的测量结束。 在催化剂前传感器的输出达到预定参考值之前，设定阈值达到。 催化剂是正常还是异常都是基于在催化剂后传感器的输出达到阈值之后测量的氧气量确定的，并且在催化剂后传感器输出后观察到的后催化剂传感器的输出行为达到 门槛。

公开(公告)号：US20110314792A1

公开(公告)日：2011-12-29

申请号：US12677277

申请日：2009-02-24

申请人： Daisuke Shibata ,  Koichi Kitaura ,  Hiroshi Sawada ,  Tatsuya Tsuji

发明人： Daisuke Shibata ,  Koichi Kitaura ,  Hiroshi Sawada ,  Tatsuya Tsuji

IPC分类号： F01N11/00

CPC分类号： F01N3/025 ,  F01N9/002 ,  F01N11/002 ,  F01N2550/04 ,  F01N2900/0601 ,  F01N2900/1606 ,  Y02T10/47

摘要： The invention intends to provide a technology which makes it possible to diagnose with higher accuracy whether or not abnormality occurs in a filter regeneration system causing excessive execution frequency of a regeneration process. The filter regeneration system initiates execution of the regeneration process, incase an estimated particulate matter (PM) accumulation amount at the filter reaches a pre-determined regeneration requiring accumulation amount; or in case the pressure upstream of the filter or the differential pressure across the filter reaches a pre-determined regeneration requiring value, the value being larger than the pressure or the differential pressure corresponding to the regeneration requiring accumulation amount. Then, the diagnosis is carried out based on a ratio of an estimated PM accumulation amount at the initiation of the execution of the regeneration process to the regeneration requiring accumulation amount.

摘要翻译： 本发明旨在提供一种能够以更高精度诊断导致再生处理的过度执行频率的过滤器再生系统中发生异常的技术。 过滤器再生系统启动再生处理的执行，使得在过滤器处的估计的颗粒物质（PM）累积量达到预定的再生需要累积量; 或者在过滤器上游的压力或过滤器上的压差达到预定的再生需求值的情况下，该值大于对应于再生需要累积量的压力或压差。 然后，基于再生处理开始时的估计PM积累量与再生需求累积量的比例进行诊断。