公开(公告)号：US4915080A

公开(公告)日：1990-04-10

申请号：US246746

申请日：1988-09-20

申请人： Shinpei Nakaniwa ,  Akira Uchikawa

发明人： Shinpei Nakaniwa ,  Akira Uchikawa

IPC分类号： F02D41/14

CPC分类号： F02D41/1475 ,  F02D41/146 ,  F02D41/1456

摘要： An electronic air-fuel ratio control apparatus in an internal combustion engine provided with an oxygen sensor emitting an output voltage in response to an oxygen concentration including the same in nitrogen oxides in an exhaust gas from the engine which controls an air-fuel ratio of an air-fuel mixture by a feedback correction-control based on a oxygen sensor having the nitrogen oxides-reducing catalytic layer, the detection of a theoretical air-fuel ratio is performed on a richer side comparing with the output on the detection of a theoretical air-fuel ratio by an oxygen sensor without the nitrogen oxides-reducing function and is not changed even though the nitrogen oxides concentration changes. Accordingly the feedback air-fuel ratio control operates to decrease the amount of nitrogen oxides and to stabilize the air-fuel ratio control. A first target air-fuel ratio for the air-fuel ratio feedback control is changed to a second target air-fuel ratio which is richer than the first target air-fuel ratio at least when the high nitrogen oxide concentration in the exhaust gas is detected thereby changing of the controlled air-fuel ratio to the too much lean side is avoided.

公开(公告)号：US4878473A

公开(公告)日：1989-11-07

申请号：US250261

申请日：1988-09-28

申请人： Shinpei Nakaniwa ,  Akira Uchikawa

发明人： Shinpei Nakaniwa ,  Akira Uchikawa

IPC分类号： F02D41/14

CPC分类号： F02D41/1475 ,  F02D41/146

摘要： An electronic air-fuel ratio control apparatus in an internal combustion engine provided with an oxygen sensor emitting an output voltage in response to an oxygen concentration including the oxygen in nitrogen oxides in an exhaust gas from the engine. The apparatus controls the air-fuel ratio of an air-fuel mixture by a feedback correction-control based on a fuel injection quantity in an on-off manner. By using an oxygen sensor having a nitrogen oxides-reducing catalytic layer, the detection of a theoretical air-fuel ratio is performed on a richer side compared to the output on the detection of a theoretical air-fuel ratio by an oxygen sensor without the nitrogen oxides-reducing function, and is not changed even through the nitrogen oxides concentration changes. Accordingly, the feedback air-fuel ratio control acts to decrease the amount of nitrogen oxides so as to stabilixe the air-fuel ratio control. A first target air-fuel ratio for the air-fuel ratio feedback control is changed to a second target air-fuel ratio, which is richer than the first target air-fuel ratio when a high nitrogen oxide conentration in the exhaust gas is detected, or which is leaner than the first target air-fuel ratio when a high imcompletely burnt component concentration in the exhaust gas is detected.

公开(公告)号：US20080116071A1

公开(公告)日：2008-05-22

申请号：US11795246

申请日：2006-01-11

申请人： Motonori Nakamura ,  Akira Uchikawa

发明人： Motonori Nakamura ,  Akira Uchikawa

IPC分类号： G01N27/26

CPC分类号： G01N27/4175

摘要： This device is a degradation judging device for an oxygen sensor having a reference electrode 23 and a measuring electrode 22, both of which hold a solid electrolyte layer therebetween, and measuring oxygen concentrations based on an electromotive force that occurs in accordance with a difference between an oxygen partial pressure of the reference electrode 23 and an oxygen partial pressure of the measuring electrode 22. A control unit 10, which controls operations of intake and exhaust valves, a spark plug and a fuel injection valve, has a degradation judging means that detects an internal resistance value “R1” of the solid electrolyte layer 21 by applying a high-frequency alternating current between the reference electrode 23 and the measuring electrode 22, and judges degradation of the solid electrolyte layer 21 by comparing an average value of the detected internal resistance value “R1” with a reference value. By this judgment, the degradation of the solid electrolyte layer 21 can accurately be judged, and an occurrence of the engine stall or emission failure can be prevented.

摘要翻译： 该装置是具有参考电极23和测量电极22的氧传感器的劣化判定装置，两者都在其间保持固体电解质层，并且基于根据电流的差异发生的电动势来测量氧浓度 参考电极23的氧分压和测量电极22的氧分压。 控制单元10，其控制进气门和排气门的操作，火花塞和燃料喷射阀，具有劣化判定装置，其通过施加高频来检测固体电解质层21的内部电阻值“R 1” 通过将检测出的内部电阻值“R 1”的平均值与参考值进行比较来判断固体电解质层21的劣化，从而判断参考电极23与测量电极22之间的交流电流。 通过这种判断，可以准确地判断固体电解质层21的劣化，能够防止发动机失速或发光故障的发生。

公开(公告)号：US6023964A

公开(公告)日：2000-02-15

申请号：US37026

申请日：1998-03-09

申请人： Yutaka Kanbara ,  Akira Uchikawa

发明人： Yutaka Kanbara ,  Akira Uchikawa

IPC分类号： G01M15/04 ,  F02D45/00 ,  G01M15/11 ,  G01L3/26

CPC分类号： G01M15/11

摘要： The present invention relates to an apparatus for diagnosing misfire of an internal combustion engine. With this invention, crank angle intervals for detecting angular velocity for each cylinder are variably set for each operation region. An average value of a predetermined number of misfire judgment values M1 set based on a plurality of angular velocities is compared with a reference value, to thereby carry out misfire diagnosis distinguishably of a misfire in a single cylinder or misfires in multiple cylinders.

摘要翻译： 本发明涉及一种用于诊断内燃机失火的装置。 利用本发明，用于检测每个气缸的角速度的曲柄角间隔是针对每个操作区域可变地设定的。 将基于多个角速度设定的预定数量的失火判定值M1的平均值与参考值进行比较，从而可以区分在单个气缸中的失火或多个气缸中的失火而进行失火诊断。

公开(公告)号：US5970967A

公开(公告)日：1999-10-26

申请号：US987098

申请日：1997-12-08

申请人： Akira Uchikawa

发明人： Akira Uchikawa

IPC分类号： F02D45/00 ,  F02D41/04 ,  F02D41/14 ,  F02D41/22

CPC分类号： F02D41/222 ,  Y02T10/40

摘要： An object is to carry out abnormality diagnosis of a wide range air-fuel ratio sensor to a high accuracy, with a relatively simple construction. Judgment is made as to whether abnormality diagnosis permit conditions have materialized, and if materialized, a detection value of an air-fuel ratio sensor is monitored. It is then judged if the responsiveness of a change in the detection value of the air-fuel ratio sensor subsequent to changing a target air-fuel ratio is within a predetermined range. If so, an OK judgment is given. If not, an NG judgment is given and a warning lamp is illuminated to advise the driver of the abnormality in the air-fuel ratio sensor so as to take action. With this arrangement, abnormality diagnosis of a wide range air-fuel ratio sensor can be carried out to a high accuracy with a relatively simple construction.

摘要翻译： 目的是以较为简单的结构高精度地进行宽范围的空燃比传感器的异常诊断。 判断异常诊断许可条件是否已经实现，如果实现，则监视空燃比传感器的检测值。 然后判断在改变目标空燃比之后空燃比传感器的检测值的变化的响应性是否在预定范围内。 如果是的话，给出一个OK的判断。 如果没有，则给出NG判断，并且点亮警告灯以向驾驶员通知空燃比传感器中的异常以便采取行动。 利用这种结构，能够以相对简单的结构高精度地进行宽范围的空燃比传感器的异常诊断。

公开(公告)号：US5728932A

公开(公告)日：1998-03-17

申请号：US761090

申请日：1996-12-05

申请人： Akira Uchikawa

发明人： Akira Uchikawa

IPC分类号： G01M15/04 ,  F02D41/04 ,  F02D41/14 ,  F02D45/00 ,  G01F25/00 ,  G01M15/00

CPC分类号： G01F25/0007 ,  F02D41/045 ,  F02D41/1498 ,  F02D2200/1015

摘要： Technology for diagnosing an intake air amount detection device of an internal combustion engine, wherein an operation region in which the engine is stably operating is determined, the opening degree of a throttle valve interposed in an intake system of the engine is detected, a change in the opening degree of the throttle valve is calculated when the opening degree of the throttle valve is changed in the determined stable operation region, and an intake air change amount detected by the intake air amount detection device is calculated when the opening degree of the throttle valve is changed in order to diagnose performance of the intake air amount detection device based on a relationship between the change in the opening degree of the throttle valve and the intake air change amount.

摘要翻译： 用于诊断内燃机的进气量检测装置的技术，其中确定发动机稳定运行的操作区域，检测插入在发动机的进气系统中的节气门的开度， 当在确定的稳定运行区域中改变节气门的开度时，计算节流阀的开度，并且当节流阀的开度计算由进气量检测装置检测到的进气量变化量时 改变以便基于节流阀的开度的变化与进气变化量之间的关系来诊断进气量检测装置的性能。

公开(公告)号：US5006221A

公开(公告)日：1991-04-09

申请号：US313890

申请日：1989-02-23

申请人： Akira Uchikawa ,  Satoshi Anbe ,  Masami Kawashima ,  Tatsumasa Yamada ,  Tadao Suwa

发明人： Akira Uchikawa ,  Satoshi Anbe ,  Masami Kawashima ,  Tatsumasa Yamada ,  Tadao Suwa

IPC分类号： G01N27/409 ,  G01N27/407 ,  G01N27/416 ,  G01N27/417

CPC分类号： G01N27/4075 ,  G01N27/4071

摘要： An oxygen gas concentration-detecting apparatus for use in an internal combustion engine comprising a plate-shaped substrate, a plate-shaped oxygen ion-conducting solid electrode for generating an electromotive force between a first surface contacted with air and a second surface contacted with an exhaust gas of the engine according to the difference between the concentrations of oxygen gases of the air and the exhaust gas, the solid electrode being laminated on the substrate, a pair of electrode members for taking out the electromotive force as a detection signal and a nitrogen oxide-reducing catalyst layer for promoting the reduction of nitrogen oxide arranged to cover the second surface of the oxygen ion-conducting solid electrode. By this apparatus, the concentration of oxygen gas inclusive of oxygen gas generated by reduction of nitrogen oxides can be precisely detected. The plate-shaped oxygen gas concentration-detecting apparatus enables to easily form a uniform catalyst reaction surface and to easily be heated so as to promote the stable reduction reaction of the nitrogen oxide-reducing catalyst layer.

公开(公告)号：US07370545B2

公开(公告)日：2008-05-13

申请号：US11582412

申请日：2006-10-18

申请人： Akira Uchikawa ,  Futoshi Ichiyanagi ,  Masao Tsukada

发明人： Akira Uchikawa ,  Futoshi Ichiyanagi ,  Masao Tsukada

IPC分类号： G01D21/00

CPC分类号： G01N27/4077

摘要： An oxygen sensor includes a sensing element detecting an oxygen concentration in a measurement gas that flows in a pipe, a cylindrical protector which covers an outside of the sensing element and whose top end portion projects toward an inside of the pipe. An outside diameter D of the protector and a projection amount L of the protector inside the pipe are set so that a ratio of the product of the outside diameter D and the projection amount L (D×L) to a cross-sectional area S of a flow passage of the pipe becomes substantially smaller than or equal to 2.5%.

摘要翻译： 氧传感器包括检测在管中流动的测量气体中的氧浓度的感测元件，覆盖感测元件的外部并且其顶端部朝向管内部突出的圆柱形保护器。 保护器的外径D和管内的保护器的突出量L被设定为使得外径D与突出量L（DxL）的乘积与流量的横截面积S的比率 管的通过变得基本上小于或等于2.5％。

公开(公告)号：US07302828B2

公开(公告)日：2007-12-04

申请号：US11227063

申请日：2005-09-16

申请人： Akira Uchikawa ,  Masao Tsukada ,  Shoichi Sakai ,  Masami Kawashima ,  Keiji Mori

发明人： Akira Uchikawa ,  Masao Tsukada ,  Shoichi Sakai ,  Masami Kawashima ,  Keiji Mori

IPC分类号： G01N7/00

CPC分类号： G01N27/4077 ,  G01N27/4062

摘要： An oxygen sensor includes a tubular casing; an oxygen detecting element installed in a leading end of the tubular casing; lead wires each extending from the oxygen detecting element to the outside of the tubular casing through an open base end of the tubular casing, each lead wire including a core wire of metal; a rubber bush plugged in the open base end of the tubular casing, the rubber bush having the lead wires passed therethrough; and a heat resisting structure for protecting the rubber bush from a high temperature. The heat resisting structure is constructed to satisfy the following inequality: 10%≦Al/Ar≦50%, wherein: Al: The sectional area in total of the lead wires; and Ar: The sectional area of the rubber bush.

摘要翻译： 氧传感器包括管状壳体; 氧检测元件，其安装在所述管状壳体的前端部; 每个引线通过管状壳体的开放的基端从氧检测元件延伸到管状外壳的外部，每个引线包括金属芯线; 插入管状壳体的开口基端的橡胶衬套，具有穿过其中的引线的橡胶衬套; 以及用于保护橡胶衬套免受高温的耐热结构。 耐热结构被构造成满足以下不等式

公开(公告)号：US06276447B1

公开(公告)日：2001-08-21

申请号：US09306344

申请日：1999-05-06

申请人： Takeshi Iguchi ,  Homare Kotate ,  Akira Uchikawa ,  Kouji Hirakami

发明人： Takeshi Iguchi ,  Homare Kotate ,  Akira Uchikawa ,  Kouji Hirakami

IPC分类号： F28F1318

CPC分类号： F28D9/0043 ,  B23K1/0008 ,  B23K1/0012 ,  F28F9/0234 ,  F28F9/0246 ,  Y10T29/49393

摘要： A tube is formed by brazing first and second plates, and is connected to a pipe through a connection block being brazed to a contacting surface of the first plate. A brazing material is clad on an inner surface of the first plate opposite to the contacting surface, and a hole penetrating through the first plate is formed in the first plate at a position corresponding to the connection block. Thus, during brazing, the brazing material clad on the inner surface of the first plate is supplied to the contacting surface through the hole by capillary phenomenon, so that the connection block is brazed to the first plate. As a result, an apparatus formed by brazing plural metal members, such as the tube of an oil cooler, is produced in low cost.

摘要翻译： 通过钎焊第一和第二板形成管，并且通过钎焊到第一板的接触表面的连接块连接到管。 钎焊材料包覆在与接触面相反的第一板的内表面上，并且穿过第一板的孔形成在与连接块对应的位置处的第一板中。 因此，在钎焊期间，通过毛细管现象将覆盖在第一板的内表面上的钎焊材料通过孔提供给接触表面，使得连接块钎焊到第一板。 结果，以低成本制造了通过钎焊多个金属构件（例如油冷却器的管）形成的装置。