公开(公告)号：US08381708B2

公开(公告)日：2013-02-26

申请号：US12999006

申请日：2009-06-18

申请人： Akihiro Katayama ,  Naoto Kato ,  Shuntaro Okazaki ,  Kenji Kimura ,  Masashi Hakariya ,  Hiroaki Tsuji

发明人： Akihiro Katayama ,  Naoto Kato ,  Shuntaro Okazaki ,  Kenji Kimura ,  Masashi Hakariya ,  Hiroaki Tsuji

IPC分类号： F02D41/00

CPC分类号： F02D41/1498 ,  F02D35/021 ,  F02D35/023 ,  F02D41/1401 ,  F02D41/1441 ,  F02D41/2454 ,  F02D2041/1418 ,  F02D2200/1015 ,  G01M15/11

摘要： An engine ECU calculates a rotational variation based on a required rotation time when a complete misfire occurs in a cylinder, a required rotation time when complete combustion occurs in the cylinder, and a required rotation time during the current combustion stroke, and integrates the calculated rotational variation. If it is determined that the number of times the rotational variation has been integrated has reached a predetermined number, the engine ECU calculates an amount of learning value deviation from the integrated rotational variation. If the amount of learning value deviation is equal to or greater than a certain amount, the engine ECU corrects a learning value of a sub-feedback control with respect to the air-fuel ratio.

摘要翻译： 发动机ECU基于在气缸中发生完全失火所需的旋转时间，在气缸中发生完全燃烧时所需的旋转时间以及当前燃烧行程期间所需的旋转时间，计算旋转变化，并且将计算出的旋转 变异。 如果确定旋转变化已经被积分的次数达到预定数量，则发动机ECU计算学习值偏离积分旋转变化量的量。 如果学习值偏差量等于或大于一定量，则发动机ECU相对于空燃比校正副反馈控制的学习值。

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：US20100132681A1

公开(公告)日：2010-06-03

申请号：US12531094

申请日：2008-06-20

申请人： Shuntaro Okazaki ,  Naoto Kato

发明人： Shuntaro Okazaki ,  Naoto Kato

IPC分类号： F02D41/00

CPC分类号： F02D41/1456 ,  F02D41/1441 ,  F02D2041/141 ,  F02D2041/2048 ,  F02D2200/0611

摘要： In an air-fuel ratio control apparatus for an internal combustion engine, a feedforward correction amount obtained in accordance with a deviation of a target air-fuel ratio from a stoichiometric air-fuel ratio and a feedback correction amount calculated on the basis of an output value of an air-fuel ratio sensor and subjected to a guard processing are added to a base fuel injection amount corresponding to the stoichiometric air-fuel ratio to decide a fuel injection amount. An upper limit (1) and a lower limit (1) of the feedback correction amount are set on the basis of an alcohol concentration and the feedforward correction amount.

摘要翻译： 在内燃机的空燃比控制装置中，根据目标空燃比与理论空燃比的偏差和基于输出的计算出的反馈修正量而求出的前馈修正量 将空燃比传感器的值进行保护处理加到与理论空燃比相对应的基本燃料喷射量中，以确定燃料喷射量。 基于酒精浓度和前馈修正量来设定反馈修正量的上限（1）和下限（1）。

公开(公告)号：US07654252B2

公开(公告)日：2010-02-02

申请号：US11869129

申请日：2007-10-09

申请人： Naoto Kato ,  Shuntaro Okazaki

发明人： Naoto Kato ,  Shuntaro Okazaki

IPC分类号： F02D41/14

CPC分类号： F02D41/1454 ,  F02D41/1441 ,  F02D41/1458 ,  F02D41/1482 ,  F02D41/2454 ,  F02D2041/1409 ,  F02D2041/1419 ,  F02D2041/1422 ,  F02D2041/1433

摘要： An air-fuel ratio control system includes: a catalyst; an A/F sensor provided upstream of the catalyst; an oxygen concentration sensor provided downstream of the catalyst; an output value estimation portion that estimates the output value of the oxygen concentration sensor using a model related to the catalyst and the oxygen concentration sensor; an integral value calculation portion that calculates an integral value of deviation being updated by integrating the difference between the actual oxygen concentration output value and the estimated output value; a correction value calculation portion that calculates a feedback correction value for the output value of the A/F sensor and a target air-fuel ratio at least based on the integral value of deviation; and an air-fuel ratio control portion that zeros a first deviation that is obtained by correcting the difference between the detected air-fuel ratio and the target air-fuel ratio, using the feedback correction value.

摘要翻译： 空燃比控制系统包括：催化剂; 设置在催化剂上游的A / F传感器; 设置在催化剂下游的氧浓度传感器; 输出值估计部，其使用与所述催化剂和所述氧浓度传感器有关的模型来估计所述氧浓度传感器的输出值; 积分值计算部分，通过对实际氧浓度输出值和估计输出值之间的差进行积分来计算正在更新的偏差积分值; 校正值计算部分，至少基于偏差的积分值计算A / F传感器的输出值的反馈校正值和目标空燃比; 以及空燃比控制部，其使用所述反馈修正值，将通过校正所述检测出的空燃比与所述目标空燃比之间的差而获得的第一偏差置零。

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：US20090138172A1

公开(公告)日：2009-05-28

申请号：US11991951

申请日：2006-11-13

申请人： Shuntaro Okazaki ,  Naoto Kato

发明人： Shuntaro Okazaki ,  Naoto Kato

IPC分类号： F02D41/30

CPC分类号： F02D41/1456 ,  F01N3/101 ,  F01N13/009 ,  F01N13/0093 ,  F01N2560/025 ,  F02D41/1441 ,  F02D41/1483 ,  F02D41/1487 ,  F02D2041/1409 ,  Y02A50/2324 ,  Y02T10/22

摘要： The air-fuel-ratio control apparatus for an internal combustion engine obtains a composite air-fuel ratio abyfs from a downstream-side correction value Vafsfb(k) based upon an output value Voxs from a downstream air-fuel-ratio sensor 67 and an output value Vabyfs from an upstream air-fuel-ratio sensor 66, and obtains an upstream-side feedback correction value DFi on the basis of the composite air-fuel ratio abyfs. A fuel injection quantity Fi is determined to a value obtained by adding the upstream-side correction value DFi to a control-use base fuel injection quantity Fbasec (=base fuel injection quantity Fbase·coefficient Ksub). The coefficient Ksub is determined on the basis of the downstream-side feedback correction value Vafsfb(k) in such a manner that the control-use base fuel injection quantity Fbasec (accordingly, the fuel injection quantity Fi) is determined such that the output value Vabyfs from the upstream air-fuel-ratio sensor 66 changes in the direction of canceling the change in the downstream-side feedback correction value Vafsfb(k).

摘要翻译： 用于内燃机的空燃比控制装置根据来自下游空燃比传感器67的输出值Voxs和下游侧空燃比传感器67的输出值Voxs，从下游侧校正值Vafsfb（k）获得复合空燃比abyfs 从上游空燃比传感器66输出的输出值Vabyfs，基于复合空燃比abyfs求出上游侧反馈修正值DFi。 燃料喷射量Fi被确定为通过将上游侧校正值DFi加到控制用基础燃料喷射量Fbasec（=基础燃料喷射量Fbase系数Ksub）而获得的值。 基于下游侧反馈校正值Vafsfb（k）来确定系数Ksub，使得控制用基础燃料喷射量Fbasec（相应地，燃料喷射量Fi）被确定为使得输出值 来自上游空燃比传感器66的Vabyfs在抵消下游侧反馈校正值Vafsfb（k）的变化的方向上变化。

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：US07293555B2

公开(公告)日：2007-11-13

申请号：US11529428

申请日：2006-09-29

申请人： Naoto Kato ,  Shuntaro Okazaki

发明人： Naoto Kato ,  Shuntaro Okazaki

IPC分类号： F02D41/00 ,  B60T7/12

CPC分类号： F02D41/182 ,  F02D41/1441 ,  F02D41/1456 ,  F02D41/2412 ,  F02D41/2454 ,  F02D41/2467 ,  F02D41/2474 ,  F02D41/40 ,  Y02T10/44

摘要： A controller approximates an output characteristic of an air flow meter using at least one parameter, and approximates a characteristic of a fuel injection characteristic of an injector using at least one parameter. These parameters are determined and updated based on an exhaust air-fuel ratio acquired by an air-fuel ratio sensor disposed in an exhaust passage, so that the exhaust air-fuel ratio approaches a target air-fuel ratio.

公开(公告)号：US20070131208A1

公开(公告)日：2007-06-14

申请号：US11637116

申请日：2006-12-12

申请人： Shuntaro Okazaki ,  Naoto Kato

发明人： Shuntaro Okazaki ,  Naoto Kato

IPC分类号： F02D41/14 ,  G06F17/00

CPC分类号： F02D41/1439 ,  F02D41/1441 ,  F02D41/1454 ,  F02D41/2454 ,  F02D2041/1432

摘要： The air-fuel-ratio control apparatus for an internal combustion engine obtains an upstream-side feedback correction value DFi for feedback-controlling an air-fuel ratio on the basis of a value (Fcrlow(k−N)) that is obtained by performing a low-pass filter process with a time constant τ to a value corresponding to an upstream-side target air-fuel ratio abyfr at the time point a dead time, which corresponds to the period from a time when the instruction for injecting fuel to the time when exhaust gas generated based up on a combustion of the fuel reaches an upstream air-fuel-ratio sensor 66, before the present point in time, and a value (Fc(k−N)) corresponding to an output value Vabyfs from the upstream air-fuel-ratio sensor 66 at the present time. The time constant τ of the low-pass filter process is set to a value equal to the time constant of the response delay of the upstream air-fuel-ratio sensor 66.

摘要翻译： 用于内燃机的空燃比控制装置基于通过执行低的空燃比获得的值（Fcrlow（kN））来获得用于反馈控制空燃比的上游侧反馈校正值DFi - 通过过滤处理，其具有时间常数τto对应于上游侧目标空燃比abyfr的值，在停止时间的时间点，其对应于从燃料喷射指令到时间 基于燃料燃烧产生的废气在当前时间点之前到达上游空燃比传感器66，并且与上游空气燃料的输出值Vabyfs对应的值（Fc（kN）） - 传感器66。 将低通滤波处理的时间常数τ设定为与上游空燃比传感器66的响应延迟的时间常数相等的值。

公开(公告)号：US07117665B2

公开(公告)日：2006-10-10

申请号：US11133215

申请日：2005-05-20

申请人： Akira Kamoto ,  Toshinari Nagai ,  Yasuhiro Oi ,  Noriyasu Adachi ,  Koji Ide ,  Daisuke Kobayashi ,  Shuntaro Okazaki ,  Naoto Kato ,  Takahiro Uchida

发明人： Akira Kamoto ,  Toshinari Nagai ,  Yasuhiro Oi ,  Noriyasu Adachi ,  Koji Ide ,  Daisuke Kobayashi ,  Shuntaro Okazaki ,  Naoto Kato ,  Takahiro Uchida

IPC分类号： F01N3/00

CPC分类号： F01N3/101 ,  F01N11/00 ,  F01N11/007 ,  F01N13/009 ,  F01N13/0093 ,  F01N2550/02 ,  F02D2200/0816 ,  Y02T10/22 ,  Y02T10/47

摘要： A catalyst degradation determining method includes the steps of: controlling an upstream-of-catalyst air-fuel ratio occurring upstream of a first catalyst to an air-fuel ratio that is rich of a stoichiometric air-fuel ratio so that first and second catalysts store oxygen up to a maximum storage amount of oxygen. The method then includes the steps of controlling the upstream-of-catalyst air-fuel ratio to a first lean air-fuel ratio until an output of a downstream-of-first-catalyst sensor indicates a lean air-fuel ratio, and then to a second lean air-fuel ratio and that has a value that is determined in accordance with an oxidizing-reducing capability index value, until a time point when an output of a downstream-of-second-catalyst air-fuel ratio sensor indicates an air-fuel ratio that is lean.

摘要翻译： 一种催化剂降解测定方法，包括以下步骤：将发生在第一催化剂上游的催化剂上游空燃比控制为具有理论空燃比的空燃比，使第一催化剂和第二催化剂储存 氧气达到最大储存量的氧气。 该方法包括以下步骤：将催化剂上游空燃比控制到第一稀空燃比，直到第一催化剂下游传感器的输出表示稀空燃比，然后至 第二稀空燃比，其具有根据氧化还原能力指标值确定的值，直到下游二催化剂空燃比传感器的输出表示空气 - 精益比。