公开(公告)号：US08230846B2

公开(公告)日：2012-07-31

申请号：US12448346

申请日：2008-04-08

申请人： Takahiko Fujiwara ,  Hiroaki Mizoguchi ,  Norihisa Nakagawa ,  Taiga Hagimoto ,  Naoto Kato ,  Shuntaro Okazaki

发明人： Takahiko Fujiwara ,  Hiroaki Mizoguchi ,  Norihisa Nakagawa ,  Taiga Hagimoto ,  Naoto Kato ,  Shuntaro Okazaki

IPC分类号： F02D41/04 ,  F02D41/00

CPC分类号： F02D41/148 ,  F02D41/0295 ,  F02D41/126 ,  F02D41/1441

摘要： The present invention relates to an air-fuel ratio control device for an internal combustion engine, and makes it possible to maintain high purification performance by suppressing a decrease in the oxygen occlusion capability of a catalyst. When an O2 sensor output oxs is greater than a reference value oxsref, which corresponds to a stoichiometric air-fuel ratio, and smaller than an upper threshold value oxsrefR, a sub-FB reflection coefficient is fixed at a predetermined value vdox2 for providing a lean air-fuel ratio. When, on the other hand, the O2 sensor output oxs is smaller than the reference value oxsref and greater than a lower threshold value oxsrefL, the sub-FB reflection coefficient is fixed at a predetermined value vdox2 for providing a rich air-fuel ratio. The sub-FB reflection coefficient reflects the O2 sensor output oxs in the calculation of a fuel injection amount and increases or decreases to have a consequence on the air-fuel ratio of an exhaust gas.

摘要翻译： 本发明涉及一种用于内燃机的空燃比控制装置，并且通过抑制催化剂的吸氧能力的降低，可以保持高的净化性能。 当O2传感器输出ox大于对应于化学计量空燃比且小于上限阈值oxsrefR的参考值oxsref时，子FB反射系数固定在预定值vdox2以提供稀薄 空燃比。 另一方面，当O2传感器输出ox小于参考值oxsref并且大于下阈值oxsrefL时，子FB反射系数固定在预定值vdox2以提供浓空燃比。 在计算燃料喷射量时，子FB反射系数反映了O2传感器输出牛，并且增加或减少以对排气的空燃比产生影响。

公开(公告)号：US20090314268A1

公开(公告)日：2009-12-24

申请号：US12448346

申请日：2008-04-08

申请人： Takahiko Fujiwara ,  Hiroaki Mizoguchi ,  Norihisa Nakagawa ,  Taiga Hagimoto ,  Naoto Kato ,  Shuntaro Okazaki

发明人： Takahiko Fujiwara ,  Hiroaki Mizoguchi ,  Norihisa Nakagawa ,  Taiga Hagimoto ,  Naoto Kato ,  Shuntaro Okazaki

IPC分类号： F02D41/00

CPC分类号： F02D41/148 ,  F02D41/0295 ,  F02D41/126 ,  F02D41/1441

摘要： The present invention relates to an air-fuel ratio control device for an internal combustion engine, and makes it possible to maintain high purification performance by suppressing a decrease in the oxygen occlusion capability of a catalyst. When an O2 sensor output oxs is greater than a reference value oxsref, which corresponds to a stoichiometric air-fuel ratio, and smaller than an upper threshold value oxsrefR, a sub-FB reflection coefficient is fixed at a predetermined value vdox2 for providing a lean air-fuel ratio. When, on the other hand, the O2 sensor output oxs is smaller than the reference value oxsref and greater than a lower threshold value oxsrefL, the sub-FB reflection coefficient is fixed at a predetermined value vdox2 for providing a rich air-fuel ratio. The sub-FB reflection coefficient reflects the O2 sensor output oxs in the calculation of a fuel injection amount and increases or decreases to have a consequence on the air-fuel ratio of an exhaust gas.

摘要翻译： 本发明涉及一种用于内燃机的空燃比控制装置，并且通过抑制催化剂的吸氧能力的降低，可以保持高的净化性能。 当O2传感器输出ox大于对应于化学计量空燃比且小于上限阈值oxsrefR的参考值oxsref时，子FB反射系数固定在预定值vdox2以提供稀薄 空燃比。 另一方面，当O2传感器输出ox小于参考值oxsref并且大于下阈值oxsrefL时，子FB反射系数固定在预定值vdox2以提供浓空燃比。 在计算燃料喷射量时，子FB反射系数反映了O2传感器输出牛，并且增加或减少以对排气的空燃比产生影响。

公开(公告)号：US07474956B2

公开(公告)日：2009-01-06

申请号：US11885266

申请日：2006-09-13

申请人： Norihisa Nakagawa ,  Takahiko Fujiwara ,  Taiga Hagimoto ,  Junichi Kako ,  Naoto Kato ,  Shuntaro Okazaki

发明人： Norihisa Nakagawa ,  Takahiko Fujiwara ,  Taiga Hagimoto ,  Junichi Kako ,  Naoto Kato ,  Shuntaro Okazaki

IPC分类号： G06F19/00 ,  F02D41/14 ,  F01N3/10

CPC分类号： F02D41/1441 ,  F01N2560/025 ,  F01N2560/14 ,  F02D41/123 ,  F02D41/1454 ,  F02D41/1456 ,  F02D2041/1409 ,  F02D2041/1422 ,  F02D2200/0814

摘要： An air-fuel ratio control system maintaining constant an oxygen storage amount or oxygen release amount per unit time with respect to an exhaust purification catalyst having an oxygen storage capacity even if the intake air amount changes is provided.An air-fuel ratio control system of an internal combustion engine having an intake air amount detecting means, a linear air-fuel ratio sensor arranged at an upstream side of an exhaust purification catalyst, an O2 sensor arranged at a downstream side of said exhaust purification catalyst, a target air-fuel ratio controlling means for performing feedback control of a target air-fuel ratio of exhaust flowing into the exhaust purification catalyst based on output information from the intake air amount detecting means and the O2 sensor, and a fuel injection amount controlling means for performing feedback control of the fuel injection amount based on output information of the linear air-fuel ratio sensor so as to achieve the target air-fuel ratio, characterized in that the target air-fuel ratio controlling means performs feedback control of the target air-fuel ratio so that even when the intake air amount changes, a correction amount per unit time of an oxygen storage amount of the exhaust purification catalyst is made constant.

摘要翻译： 即使提供进气量变化，也能够提供相对于具有储氧能力的排气净化催化剂，每单位时间保持恒定氧气储存量或氧释放量的空燃比控制系统。 一种内燃机的空燃比控制系统，具有进气量检测装置，布置在排气净化催化剂的上游侧的线性空燃比传感器，配置在排气净化装置的下游侧的O2传感器 催化剂，目标空燃比控制装置，用于根据来自进气量检测装置和O2传感器的输出信息，对流入排气净化催化剂的排气的目标空燃比进行反馈控制;燃料喷射量 控制装置，用于基于线性空燃比传感器的输出信息进行燃料喷射量的反馈控制，以实现目标空燃比，其特征在于，所述目标空燃比控制装置执行所述目标空燃比控制装置的反馈控制， 目标空燃比，使得即使当进气量变化时，排气的氧气存储量的每单位时间的校正量 净化催化剂保持恒定。

公开(公告)号：US08122869B2

公开(公告)日：2012-02-28

申请号：US12443782

申请日：2007-08-13

申请人： Takahiko Fujiwara ,  Norihisa Nakagawa ,  Taiga Hagimoto ,  Junichi Kako ,  Naoto Kato ,  Shuntaro Okazaki ,  Koji Ide

发明人： Takahiko Fujiwara ,  Norihisa Nakagawa ,  Taiga Hagimoto ,  Junichi Kako ,  Naoto Kato ,  Shuntaro Okazaki ,  Koji Ide

IPC分类号： F02M1/00

CPC分类号： F02D41/2454 ,  F02D13/023 ,  F02D41/1454 ,  F02D41/2438 ,  F02D41/2474 ,  Y02T10/18

摘要： An air-fuel ratio control system of a multi-cylinder internal combustion engine provided with a throttle valve and opening characteristic control means, which system performs feedback control of an air-fuel ratio based on an output of a sensor detecting an air-fuel ratio of exhaust gas and is capable of performing more accurate air-fuel ratio control, is provided. In the feedback control, the relationship of the output of the sensor and a feedback value is corrected based on a feedback learning correction value learned and determined based on the output of the sensor during the feedback control, and, when newly learning the feedback learning correction value, the intake air amount is controlled by only the throttle valve.

摘要翻译： 具有节气门和开启特性控制装置的多缸内燃机的空燃比控制系统，其基于检测空燃比的传感器的输出进行空燃比的反馈控制 的排气，能够进行更精确的空燃比控制。 在反馈控制中，基于在反馈控制期间基于传感器的输出而学习和确定的反馈学习校正值来校正传感器的输出与反馈值的关系，并且当新学习反馈学习校正时 值，进气量仅由节流阀控制。

公开(公告)号：US20070169465A1

公开(公告)日：2007-07-26

申请号：US11647243

申请日：2006-12-29

申请人： Norihisa Nakagawa ,  Takahiko Fujiwara ,  Taiga Hagimoto ,  Junichi Kako ,  Naoto Kato ,  Shuntaro Okazaki

发明人： Norihisa Nakagawa ,  Takahiko Fujiwara ,  Taiga Hagimoto ,  Junichi Kako ,  Naoto Kato ,  Shuntaro Okazaki

IPC分类号： F01N3/00 ,  F02D41/14

CPC分类号： F02D41/123 ,  F01N2430/06 ,  F01N2560/02 ,  F02D41/1475 ,  Y02T10/22

摘要： The output from an air-fuel ratio sensor is corrected using an integral term that is calculated by integrating values of deviation of the output from an oxygen sensor with respect to a reference output that would be obtained when the combustion air-fuel ratio is stoichiometric, when an engine operates with a target combustion air-fuel ratio set to the stoichiometric air-fuel ratio. A fuel-cutoff prohibition period in which fuel supply cutoff is prohibited is set so that the engine continues to operate with the target combustion air-fuel ratio set to the stoichiometric air-fuel ratio, until the integral term is updated at least once. The integral term may be updated when a predetermined updating condition is satisfied.

摘要翻译： 使用通过将氧传感器的输出的偏差的值相对于在燃烧空燃比为化学计量时获得的基准输出而计算的积分项来校正来自空燃比传感器的输出， 当发动机以设定为理论空燃比的目标燃烧空燃比运行时。 设定禁止燃料供给切断的燃料切断禁止期间，使得发动机以设定为理论空燃比的目标燃耗空燃比继续运转，直到积分项更新至少一次。 当满足预定的更新条件时，可以更新积分项。

公开(公告)号：US20100108046A1

公开(公告)日：2010-05-06

申请号：US12595767

申请日：2008-04-11

申请人： Norihisa Nakagawa ,  Takahiko Fujiwara ,  Taiga Hagimoto ,  Junichi Kako ,  Naoto Kato ,  Shuntaro Okazaki

发明人： Norihisa Nakagawa ,  Takahiko Fujiwara ,  Taiga Hagimoto ,  Junichi Kako ,  Naoto Kato ,  Shuntaro Okazaki

IPC分类号： F02D41/00

CPC分类号： F02D41/1455 ,  F02D41/1441 ,  F02D41/1456 ,  F02D41/2461

摘要： An air-fuel ratio control device includes an air-fuel ratio sensor provided upstream from a three-way catalyst, and an oxygen sensor provided downstream from the three-way catalyst. The air-fuel ratio control device controls the fuel supply amount based on the output from the air-fuel ratio sensor, and compensates for errors in the air-fuel ratio sensor by correcting the fuel supply amount based on the output from the oxygen sensor. The fuel supply correction amount is calculated based on an integral term that integrates the deviation between the output from the downstream air-fuel ratio sensor and the target air-fuel ratio. When a fuel supply adjustment control is executed, the value of the integral term in the sub-feedback control is not updated for a predetermined period after the fuel supply adjustment control ends. The actual air-fuel ratio is thus brought to the target air-fuel ratio in an appropriate manner.

摘要翻译： 空燃比控制装置包括设置在三元催化剂上游的空燃比传感器和设置在三元催化剂下游的氧传感器。 空燃比控制装置基于空燃比传感器的输出来控制燃料供给量，并且通过基于氧传感器的输出校正燃料供给量来补偿空燃比传感器的误差。 基于将来自下游空燃比传感器的输出与目标空燃比的偏差进行积分的积分项来计算燃料供给修正量。 当执行燃料供给调节控制时，在燃料供给调节控制结束之后的预定时间段内，子反馈控制中的积分项的值不被更新。 因此，实际的空燃比以适当的方式达到目标空燃比。

公开(公告)号：US20100024790A1

公开(公告)日：2010-02-04

申请号：US12443782

申请日：2007-08-13

申请人： Takahiko Fujiwara ,  Norihisa Nakagawa ,  Taiga Hagimoto ,  Junichi Kako ,  Naoto Kato ,  Shuntaro Okazaki ,  Koji Ide

发明人： Takahiko Fujiwara ,  Norihisa Nakagawa ,  Taiga Hagimoto ,  Junichi Kako ,  Naoto Kato ,  Shuntaro Okazaki ,  Koji Ide

IPC分类号： F02D41/00

CPC分类号： F02D41/2454 ,  F02D13/023 ,  F02D41/1454 ,  F02D41/2438 ,  F02D41/2474 ,  Y02T10/18

摘要： An air-fuel ratio control system of a multi-cylinder internal combustion engine provided with a throttle valve and opening characteristic control means, which system performs feedback control of an air-fuel ratio based on an output of a sensor detecting an air-fuel ratio of exhaust gas and is capable of performing more accurate air-fuel ratio control, is provided. In the feedback control, the relationship of the output of the sensor and a feedback value is corrected based on a feedback learning correction value learned and determined based on the output of the sensor during the feedback control, and, when newly learning the feedback learning correction value, the intake air amount is controlled by only the throttle valve.

摘要翻译： 具有节气门和开启特性控制装置的多缸内燃机的空燃比控制系统，其基于检测空燃比的传感器的输出进行空燃比的反馈控制 的排气，能够进行更精确的空燃比控制。 在反馈控制中，基于在反馈控制期间基于传感器的输出而学习和确定的反馈学习校正值来校正传感器的输出与反馈值的关系，并且当新学习反馈学习校正时 值，进气量仅由节流阀控制。

公开(公告)号：US08406980B2

公开(公告)日：2013-03-26

申请号：US12595767

申请日：2008-04-11

申请人： Norihisa Nakagawa ,  Takahiko Fujiwara ,  Taiga Hagimoto ,  Junichi Kako ,  Naoto Kato ,  Shuntaro Okazaki

发明人： Norihisa Nakagawa ,  Takahiko Fujiwara ,  Taiga Hagimoto ,  Junichi Kako ,  Naoto Kato ,  Shuntaro Okazaki

IPC分类号： B60T7/12 ,  G05D1/00 ,  G06F7/00 ,  G06F17/00 ,  F01N3/00 ,  F02D41/00

CPC分类号： F02D41/1455 ,  F02D41/1441 ,  F02D41/1456 ,  F02D41/2461

摘要： An air-fuel ratio control device includes an air-fuel ratio sensor provided upstream from a three-way catalyst, and an oxygen sensor provided downstream from the three-way catalyst. The air-fuel ratio control device controls the fuel supply amount based on the output from the air-fuel ratio sensor, and compensates for errors in the air-fuel ratio sensor by correcting the fuel supply amount based on the output from the oxygen sensor. The fuel supply correction amount is calculated based on an integral term that integrates the deviation between the output from the downstream air-fuel ratio sensor and the target air-fuel ratio. When a fuel supply adjustment control is executed, the value of the integral term in the sub-feedback control is not updated for a predetermined period after the fuel supply adjustment control ends. The actual air-fuel ratio is thus brought to the target air-fuel ratio in an appropriate manner.

摘要翻译： 空燃比控制装置包括设置在三元催化剂上游的空燃比传感器和设置在三元催化剂下游的氧传感器。 空燃比控制装置基于空燃比传感器的输出来控制燃料供给量，并且通过基于氧传感器的输出校正燃料供给量来补偿空燃比传感器的误差。 基于将来自下游空燃比传感器的输出与目标空燃比的偏差进行积分的积分项来计算燃料供给修正量。 当执行燃料供给调节控制时，在燃料供给调节控制结束之后的预定时间段内，子反馈控制中的积分项的值不被更新。 因此，实际的空燃比以适当的方式达到目标空燃比。

公开(公告)号：US20080147297A1

公开(公告)日：2008-06-19

申请号：US11885266

申请日：2006-09-13

申请人： Norihisa Nakagawa ,  Takahiko Fujiwara ,  Taiga Hagimoto ,  Junichi Kako ,  Naoto Kato ,  Shuntaro Okazaki

发明人： Norihisa Nakagawa ,  Takahiko Fujiwara ,  Taiga Hagimoto ,  Junichi Kako ,  Naoto Kato ,  Shuntaro Okazaki

IPC分类号： F02D41/00 ,  F02D41/06 ,  F02D45/00 ,  F01N3/18

CPC分类号： F02D41/1441 ,  F01N2560/025 ,  F01N2560/14 ,  F02D41/123 ,  F02D41/1454 ,  F02D41/1456 ,  F02D2041/1409 ,  F02D2041/1422 ,  F02D2200/0814

摘要： An air-fuel ratio control system maintaining constant an oxygen storage amount or oxygen release amount per unit time with respect to an exhaust purification catalyst having an oxygen storage capacity even if the intake air amount changes is provided.An air-fuel ratio control system of an internal combustion engine having an intake air amount detecting means, a linear air-fuel ratio sensor arranged at an upstream side of an exhaust purification catalyst, an O2 sensor arranged at a downstream side of said exhaust purification catalyst, a target air-fuel ratio controlling means for performing feedback control of a target air-fuel ratio of exhaust flowing into the exhaust purification catalyst based on output information from the intake air amount detecting means and the O2 sensor, and a fuel injection amount controlling means for performing feedback control of the fuel injection amount based on output information of the linear air-fuel ratio sensor so as to achieve the target air-fuel ratio, characterized in that the target air-fuel ratio controlling means performs feedback control of the target air-fuel ratio so that even when the intake air amount changes, a correction amount per unit time of an oxygen storage amount of the exhaust purification catalyst is made constant.

摘要翻译： 即使提供进气量变化，也能够提供相对于具有储氧能力的排气净化催化剂，每单位时间保持恒定氧气储存量或氧释放量的空燃比控制系统。 一种内燃机的空燃比控制系统，具有进气量检测装置，布置在排气净化催化剂的上游侧的线性空燃比传感器，配置有O 2传感器 在所述排气净化催化剂的下游侧，基于来自所述进气量检测单元的输出信息，对所述排气净化催化剂的排气进行目标空燃比的反馈控制的目标空燃比控制单元， O 2传感器，以及燃料喷射量控制装置，用于基于线性空燃比传感器的输出信息执行燃料喷射量的反馈控制，以实现目标空燃比， 其特征在于，所述目标空燃比控制单元对所述目标空燃比进行反馈控制，使得即使在所述进气量变化时，每单位时间的氧气存储量的修正量 使排气净化催化剂的量保持恒定。

公开(公告)号：US08146353B2

公开(公告)日：2012-04-03

申请号：US12153522

申请日：2008-05-20

申请人： Taiga Hagimoto ,  Norihisa Nakagawa

发明人： Taiga Hagimoto ,  Norihisa Nakagawa

IPC分类号： F01N3/24

CPC分类号： F01N3/2053 ,  F01N3/101 ,  F01N3/2093 ,  F01N9/00 ,  F01N13/009 ,  F01N13/0093 ,  F01N13/011 ,  F01N13/1816 ,  F01N2240/36 ,  F01N2410/00 ,  F01N2560/025 ,  Y02A50/2324 ,  Y02T10/22

摘要： An exhaust purification device includes a front catalyst arranged in an exhaust system of the internal combustion engine that is longitudinally mounted in a vehicle, a rear catalyst arranged in the exhaust system downstream of the front catalyst, and a bypass pipe that communicates with the exhaust passage of the exhaust system upstream of the front catalyst, communicates with the exhaust passage between the front catalyst and the rear catalyst, and is arranged at a position that is spaced apart in a direction perpendicular to the vibration direction of the exhaust system.

摘要翻译： 排气净化装置具备：内燃机的纵向安装在车辆的排气系统中的前部催化剂，配置在前部催化剂下游侧的排气系统中的后部催化剂和与排气通路连通的旁通管 在前催化剂上游的排气系统与前催化剂和后催化剂之间的排气通道连通，并且布置在与排气系统的振动方向垂直的方向上间隔开的位置。