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：US20070089398A1

公开(公告)日：2007-04-26

申请号：US11583726

申请日：2006-10-20

申请人： Takahiko Fujiwara ,  Yasuyuki Takama

发明人： Takahiko Fujiwara ,  Yasuyuki Takama

IPC分类号： F01N3/00 ,  F01N7/00

CPC分类号： F01N11/007 ,  F01N2900/0421 ,  F01N2900/0422 ,  Y02T10/47

摘要： 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.

摘要翻译： 在催化剂的劣化检测期间，将稀空气/燃料比的废气和浓空气/燃料比的废气交替地供给到催化剂中，并且检测到O 2存储功能的降低 通过在催化剂中获得氧气吸留量，基于流过催化剂的废气的空气/燃料比的切换之后，通过催化剂的排气的空气/燃料比变化为轨迹 流入催化剂的废气的空气/燃料比。 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。

公开(公告)号：US07159388B2

公开(公告)日：2007-01-09

申请号：US10881177

申请日：2004-07-01

申请人： Norihisa Nakagawa ,  Takahiko Fujiwara

发明人： Norihisa Nakagawa ,  Takahiko Fujiwara

IPC分类号： F01N3/00 ,  F01N3/10

CPC分类号： F01N3/101 ,  F01N3/28 ,  F01N13/009 ,  F01N13/0093 ,  F01N2570/10 ,  F01N2570/12 ,  F01N2570/14 ,  F02D41/1441 ,  F02D41/1456 ,  F02D41/2461 ,  Y02T10/22

摘要： A catalyst is positioned in an exhaust path of an internal-combustion engine. A main air-fuel ratio sensor and sub-oxygen sensor are respectively positioned upstream and downstream of the catalyst. A main feedback operation is performed so that the output of the main air-fuel ratio sensor is fed back and reflected in the fuel injection quantity until the control A/F prevailing upstream of the catalyst coincides with the target A/F. A sub-feedback operation is performed so that the output of the sub-oxygen sensor is fed back and reflected in the fuel injection quantity until the air-fuel ratio of an exhaust gas flowing out of the catalyst agrees with a theoretical air-fuel ratio. Since a catalyst window varies in accordance with the intake air quantity, the fuel injection quantity is corrected so that the larger the intake air quantity becomes, the richer the control A/F is.

摘要翻译： 催化剂位于内燃机的排气路径中。 主要的空燃比传感器和次氧传感器分别位于催化剂的上游和下游。 执行主反馈操作，使得主空燃比传感器的输出被反馈并反映在燃料喷射量中，直到催化剂上游的控制A / F与目标A / F一致。 执行副反馈操作，使得副氧传感器的输出反馈并以燃料喷射量反映，直到从催化剂流出的排气的空燃比与理论空燃比一致 。 由于催化剂窗口根据进气量而变化，因此校正燃料喷射量，使得进气量越大，控制装置A / F越浓。

公开(公告)号：US5337090A

公开(公告)日：1994-08-09

申请号：US986033

申请日：1992-12-04

申请人： Masanori Ogino ,  Takeo Yamada ,  Miyuki Ikeda ,  Tsuneo Fujikura ,  Takahiko Fujiwara

发明人： Masanori Ogino ,  Takeo Yamada ,  Miyuki Ikeda ,  Tsuneo Fujikura ,  Takahiko Fujiwara

IPC分类号： H03H7/07 ,  G09G1/00 ,  H03F3/191 ,  H03F3/45 ,  H03H7/06 ,  H04N5/14 ,  H04N5/208 ,  H04N5/21

CPC分类号： H03H7/06 ,  H03F3/191 ,  H03F3/45071 ,  H04N5/148 ,  H04N5/208

摘要： A video output circuit of a wide bandwidth comprises a bridged-T-type circuit, a first inductor connected in series to the bridged-T-type circuit, and a shunt circuit connected in series to the bridged-T-type circuit and including a second inductor and a first resistor connected in parallel with each other. The bridged-T-type circuit, the first inductor and the shunt circuit cooperate to constitute together with a plurality of stray capacitors a low-pass filter whose order is at least 4 and whose merit index is at least 3.

摘要翻译： 宽带宽的视频输出电路包括桥接T型电路，与桥接T型电路串联连接的第一电感器，以及与桥接T型电路串联连接的并联电路，包括： 第二电感器和第一电阻器彼此并联连接。 桥接T型电路，第一电感器和分流电路配合与多个杂散电容器一起构成低阶滤波器，其阶数至少为4，其优点指数至少为3。

公开(公告)号：US08712667B2

公开(公告)日：2014-04-29

申请号：US13320666

申请日：2009-05-21

申请人： Tomohiro Nakano ,  Takahiko Fujiwara

发明人： Tomohiro Nakano ,  Takahiko Fujiwara

IPC分类号： B60T7/12

CPC分类号： F02D41/0235 ,  F01N13/009 ,  F02D41/1441

摘要： 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.

摘要翻译： 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。

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：US08266898B2

公开(公告)日：2012-09-18

申请号：US12674833

申请日：2008-09-18

申请人： Takahiko Fujiwara ,  Noriyasu Kobashi

发明人： Takahiko Fujiwara ,  Noriyasu Kobashi

IPC分类号： F01N3/02 ,  F01N3/35 ,  F02D41/14

CPC分类号： F02D41/029 ,  F02D41/123 ,  F02D41/22 ,  F02D2200/0804 ,  F02D2200/0812

摘要： 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.

摘要翻译： 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。

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：US08074441B2

公开(公告)日：2011-12-13

申请号：US11432404

申请日：2006-05-12

申请人： Takahiko Fujiwara

发明人： Takahiko Fujiwara

IPC分类号： F01N3/00

CPC分类号： F02D41/1454 ,  F01N11/007 ,  F01N2550/02 ,  F02D41/1475 ,  F02D41/1495 ,  F02D2041/228 ,  F02D2200/0816 ,  Y02T10/47

摘要： 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.

摘要翻译： 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。