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公开(公告)号：US09790873B2
公开(公告)日：2017-10-17
申请号：US13700248
申请日：2010-05-28
Applicant: Makoto Tomimatsu , Ryota Onoe , Takahiko Fujiwara
Inventor： Makoto Tomimatsu , Ryota Onoe , Takahiko Fujiwara
CPC classification number: F02D41/00 , F02D41/1441 , F02D41/1456 , F02D41/1479 , F02D41/1482 , F02D41/1483 , F02D41/2454 , F02D41/30
Abstract: An air-fuel ratio control controls an air-fuel ratio (air-fuel ratio of an engine) of a mixture supplied to the engine, based on an output value of the downstream-side air-fuel ratio sensor disposed downstream of a catalyst. That is, the air-fuel ratio control apparatus sets the air-fuel ratio of the engine at a rich air-fuel ratio when the output Voxs is smaller than a reference value VREF (when a rich request is occurring). The air-fuel ratio control apparatus sets the air-fuel ratio of the engine at a lean air-fuel ratio when the output Voxs is larger than a reference value VREF (when a lean request is occurring). The air-fuel ratio control apparatus makes the target value VREF gradually come closer to a reference value VF (stoichiometric air-fuel ratio corresponding value) from a certain value, when the output value Voxs deviates greatly from the reference value Vf (points P1-P3).
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公开(公告)号：US09188072B2
公开(公告)日：2015-11-17
申请号：US13825705
申请日：2010-09-24
Applicant: Makoto Tomimatsu , Takahiko Fujiwara
Inventor： Makoto Tomimatsu , Takahiko Fujiwara
CPC classification number: F02D41/0235 , F01N13/008 , F01N13/0093 , F01N2560/025 , F02D17/02 , F02D41/0085 , F02D41/1441 , F02D41/1454 , F02D41/1458 , F02D41/1463 , F02D41/2454 , Y02T10/22
Abstract: An embodiment (control apparatus) of an air-fuel ratio control apparatus according to the present invention determines, based on an output value Voxs of a downstream air-fuel ratio sensor 56 disposed at a position downstream of a three-way catalyst 43, which air-fuel request is occurring, a rich request or a lean request. The control apparatus sets an air-fuel ratio of each cylinder (cylinder-by-cylinder air-fuel ratio) to a rich air-fuel ratio when the rich request is occurring, and sets the cylinder-by-cylinder air-fuel ratio to a lean air-fuel ratio when the lean request is occurring. The control apparatus has a cylinder-by-cylinder air-fuel ratio of a specific cylinder different from a cylinder-by-cylinder air-fuel ratio of the other cylinder so as to obtain a fluctuation period correlated value indicative of a fluctuation of the output value Voxs of the downstream air-fuel ratio sensor 56, and determines an influence/impact degree on the output value of the downstream air-fuel ratio sensor of an exhaust gas discharged from each of a plurality of cylinders, based on the fluctuation period correlated value. Further, the control apparatus controls the air-fuel ratio of each cylinder in accordance with the influence degree.
Abstract translation: 根据本发明的空燃比控制装置的一个实施例（控制装置）基于设置在三元催化剂43下游的下游空燃比传感器56的输出值Voxs， 空气燃料请求正在发生，丰富的请求或精益请求。 控制装置在发生丰满请求时将各气缸的空燃比（气缸/空气比）逐个设定为浓空燃比，并且将逐缸空燃比设定为 在发生精益请求时的贫空燃比。 所述控制装置具有与所述另一个气缸的与所述气缸的空燃比不同的特定气缸的逐缸空燃比，以获得表示所述输出的波动的波动周期相关值 下游空燃比传感器56的Vox值，并且基于波动周期相关地确定对从多个气缸中的每一个排出的排气的下游空燃比传感器的输出值的影响/冲击程度 值。 此外，控制装置根据影响程度来控制各气缸的空燃比。
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公开(公告)号：US08712667B2
公开(公告)日：2014-04-29
申请号：US13320666
申请日：2009-05-21
Applicant: Tomohiro Nakano , Takahiko Fujiwara
Inventor： Tomohiro Nakano , Takahiko Fujiwara
IPC: B60T7/12
CPC classification number: F02D41/0235 , F01N13/009 , F02D41/1441
Abstract: A air-fuel ratio control apparatus, applied to an internal combustion engine having a catalyst disposed in an exhaust passage of the engine, includes a downstream air-fuel ratio sensor (oxygen concentration cell type oxygen concentration sensor) disposed at a position downstream of the catalyst, and air-fuel ratio control means for controlling, based on an output value of the downstream air-fuel ratio sensor, an air-fuel ratio of a mixture supplied to the engine so as to change an air-fuel ratio of a catalyst inflow gas. Further, the air-fuel ratio control means controls the air-fuel ratio of the mixture supplied to the engine.
Abstract translation: 应用于具有设置在发动机的排气通路中的催化剂的内燃机的空燃比控制装置包括下游空燃比传感器（氧浓度电池型氧浓度传感器），位于下游的位置 催化剂和空燃比控制装置，用于基于下游空燃比传感器的输出值控制供给发动机的混合物的空燃比，以改变催化剂的空燃比 流入气体。 此外，空燃比控制装置控制供给到发动机的混合物的空燃比。
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公开(公告)号：US20130231845A1
公开(公告)日：2013-09-05
申请号：US13821795
申请日：2010-09-09
Applicant: Ryota Onoe , Junichi Suzuki , Takahiko Fujiwara , Makoto Tomimatsu
Inventor： Ryota Onoe , Junichi Suzuki , Takahiko Fujiwara , Makoto Tomimatsu
IPC: F02D41/02
CPC classification number: F02D41/0235 , F02D41/1441 , F02D41/1454 , F02D41/1475 , F02D41/2441 , F02D41/2454
Abstract: An air-fuel ratio control apparatus of the present invention comprises an inverse direction spike introducing section and an inverse direction spike interval setting section. The inverse direction spike introducing section introduces, while an air-fuel ratio correction required by an output of a downstream air-fuel ratio sensor is being carried out, an inverse direction spike which is an air-fuel ratio spike to temporarily change an air-fuel ratio of an exhaust gas toward a direction opposite to a direction of the air-fuel ratio correction with respect to a target control air-fuel ratio. The inverse direction spike interval setting section sets, based on an operating state of an internal combustion engine system, an inverse direction spike interval which is an interval between two of the inverse direction spikes next to each other in time.
Abstract translation: 本发明的空燃比控制装置包括反方向尖峰引入部和逆方向尖峰间隔设定部。 逆向尖峰引入部引入在进行下游空燃比传感器的输出所要求的空燃比校正的同时进行作为空燃比尖峰的反方向尖峰， 相对于目标控制空燃比，排气朝与空燃比校正方向相反的方向的燃料比。 逆方向尖峰间隔设定部基于内燃机系统的运转状态，设定作为时间上相邻的两个逆方向前后的间隔的反方向时间间隔。
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5.发明授权Air-fuel ratio control device and air-fuel ratio control method for internal combustion engine 有权用于内燃机的空燃比控制装置和空燃比控制方法公开(公告)号：US08406980B2
公开(公告)日：2013-03-26
申请号：US12595767
申请日：2008-04-11
Applicant: Norihisa Nakagawa , Takahiko Fujiwara , Taiga Hagimoto , Junichi Kako , Naoto Kato , Shuntaro Okazaki
Inventor： Norihisa Nakagawa , Takahiko Fujiwara , Taiga Hagimoto , Junichi Kako , Naoto Kato , Shuntaro Okazaki
CPC classification number: F02D41/1455 , F02D41/1441 , F02D41/1456 , F02D41/2461
Abstract: 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.
Abstract translation: 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。
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Patent Agency Ranking
公开(公告)号：US08266898B2
公开(公告)日：2012-09-18
申请号：US12674833
申请日：2008-09-18
Applicant: Takahiko Fujiwara , Noriyasu Kobashi
Inventor： Takahiko Fujiwara , Noriyasu Kobashi
CPC classification number: F02D41/029 , F02D41/123 , F02D41/22 , F02D2200/0804 , F02D2200/0812
Abstract: An internal combustion engine is provided that performs stoichiometric burn operation under control for providing a stoichiometric air-fuel ratio as basic control for an air-fuel ratio. A particulate filter (PM filter) is provided in an exhaust passage of the engine to trap particulate matter PM contained in exhaust gas. If it is judged that the PM filter will have excessively elevated temperature, fuel cut is prohibited during deceleration. Otherwise, before the prohibition of the fuel cut, the air-fuel ratio of exhaust gas is controlled so that the atmosphere of the PM filter is brought into an atmosphere slightly leaner than the stoichiometric air-fuel ratio.
Abstract translation: 提供一种内燃机，其在控制下进行化学计量燃烧操作，以提供理论空燃比作为空燃比的基本控制。 在发动机的排气通道中设置有微粒过滤器（PM过滤器），以捕集废气中所含的颗粒物质PM。 如果判断为PM过滤器的温度过高，减速时禁止燃油切断。 否则，在禁止燃料切断之前，控制废气的空燃比，使得PM过滤器的气氛进入比理论空燃比略微稀释的气氛中。
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公开(公告)号：US08230846B2
公开(公告)日：2012-07-31
申请号：US12448346
申请日：2008-04-08
Applicant: Takahiko Fujiwara , Hiroaki Mizoguchi , Norihisa Nakagawa , Taiga Hagimoto , Naoto Kato , Shuntaro Okazaki
Inventor： Takahiko Fujiwara , Hiroaki Mizoguchi , Norihisa Nakagawa , Taiga Hagimoto , Naoto Kato , Shuntaro Okazaki
CPC classification number: F02D41/148 , F02D41/0295 , F02D41/126 , F02D41/1441
Abstract: 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.
Abstract translation: 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。
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公开(公告)号：US08074441B2
公开(公告)日：2011-12-13
申请号：US11432404
申请日：2006-05-12
Applicant: Takahiko Fujiwara
Inventor： Takahiko Fujiwara
IPC: F01N3/00
CPC classification number: F02D41/1454 , F01N11/007 , F01N2550/02 , F02D41/1475 , F02D41/1495 , F02D2041/228 , F02D2200/0816 , Y02T10/47
Abstract: A target air-fuel ratio of exhaust gas is changed back and forth between rich and lean in short periods, and it is determined that the catalyst is degraded when the air-fuel ratio of exhaust gas is lean by the time a predetermined period of time has passed from the time the target air-fuel ratio started to be changed.
Abstract translation: 废气的目标空燃比在短时间内在浓缩和稀薄之间变化地变化，并且确定当排气的空燃比在预定时间段内变稀时催化剂劣化 从目标空燃比开始变为通过。
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公开(公告)号：US07861514B2
公开(公告)日：2011-01-04
申请号：US11583726
申请日：2006-10-20
Applicant: Takahiko Fujiwara , Yasuyuki Takama
Inventor： Takahiko Fujiwara , Yasuyuki Takama
CPC classification number: F01N11/007 , F01N2900/0421 , F01N2900/0422 , Y02T10/47
Abstract: During deterioration detection of a catalyst, exhaust gas of a lean air/fuel ratio and exhaust gas of a rich air/fuel ratio are alternately supplied to the catalyst, and decrease of the O2 storage function is detected by obtaining the oxygen occlusion amount in the catalyst, based upon the timing at which, after changeover of the air/fuel ratio of the exhaust gas flowing into the catalyst, the air/fuel ratio of the exhaust gas passed through the catalyst changes to track that air/fuel ratio of the exhaust gas flowing into the catalyst. At this time, the rich air/fuel ratio of the exhaust gas and the lean air/fuel ratio of the exhaust gas supplied to the catalyst are set closer to the stoichiometric air/fuel ratio, the larger is the exhaust flow amount.
Abstract translation: 在催化剂的劣化检测中，将稀空燃比的废气和浓空燃比的废气交替地供给到催化剂中，通过获得氧吸留量来检测O2储存功能的降低 催化剂，基于流过催化剂的废气的空燃比转换后通过催化剂的废气的空燃比发生变化，跟踪排气的空气/燃料比 气体流入催化剂。 此时，供给到催化剂的废气的浓空气/燃料比和稀空气/燃料比被设定为接近理论空燃比，废气流量越大。
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公开(公告)号：US20100205942A1
公开(公告)日：2010-08-19
申请号：US12674833
申请日：2008-09-18
Applicant: Takahiko Fujiwara , Noriyasu Kobashi
Inventor： Takahiko Fujiwara , Noriyasu Kobashi
CPC classification number: F02D41/029 , F02D41/123 , F02D41/22 , F02D2200/0804 , F02D2200/0812
Abstract: An internal combustion engine is provided that performs stoichiometric burn operation under control for providing a stoichiometric air-fuel ratio as basic control for an air-fuel ratio. A particulate filter (PM filter) is provided in an exhaust passage of the engine to trap particulate matter PM contained in exhaust gas. If it is judged that the PM filter will have excessively elevated temperature, fuel cut is prohibited during deceleration. Otherwise, before the prohibition of the fuel cut, the air-fuel ratio of exhaust gas is controlled so that the atmosphere of the PM filter is brought into an atmosphere slightly leaner than the stoichiometric air-fuel ratio.
Abstract translation: 提供一种内燃机，其在控制下进行化学计量燃烧操作，以提供理论空燃比作为空燃比的基本控制。 在发动机的排气通道中设置有微粒过滤器（PM过滤器），以捕集废气中所含的颗粒物质PM。 如果判断为PM过滤器的温度过高，减速时禁止燃油切断。 否则，在禁止燃料切断之前，控制废气的空燃比，使得PM过滤器的气氛进入比理论空燃比略微稀释的气氛中。
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