公开(公告)号：US4772376A

公开(公告)日：1988-09-20

申请号：US23809

申请日：1987-03-09

申请人： Fumio Yukawa ,  Masayuki Touda ,  Shinji Kimura ,  Fumio Munakata ,  Satoru Ichikawa

发明人： Fumio Yukawa ,  Masayuki Touda ,  Shinji Kimura ,  Fumio Munakata ,  Satoru Ichikawa

IPC分类号： F02D41/14 ,  G01N27/406 ,  G01N27/409 ,  G01N27/413 ,  G01N27/416 ,  G01N27/417 ,  G01N27/58

CPC分类号： G01N27/417 ,  G01N27/4065

摘要： An air/fuel ratio sensor has an oxygen sensor cell including a primary measuring element in direct contact with a gas such as exhaust gases of an automotive engine, and an oxygen pump cell formed by inner and outer electrodes and a cover of an oxygen ion conductive solid electrolyte which confines the primary measuring element within a gas diffusion control space, and which has a small gas diffusion hole. The primary measuring element is formed with a central opening whose center lies right below the gas diffusion hole, in order to reduce a burden imposed on the oxygen pump cell and prevent overshoot in a sensor response characteristic. The oxygen sensor cell may be composed of the primary measuring element of a transition metal oxide connected with a pair of electrodes for measurement of an electrical resistance of the primary element, or may be composed of an oxygen ion conductive solid electrolyte substrate sandwiched between a reference electrode and the primary measuring element which serves as a measuring electrode.

摘要翻译： 空气/燃料比传感器具有氧气传感器单元，该氧传感器单元包括与诸如汽车发动机的废气的气体直接接触的主要测量元件和由内部和外部电极形成的氧气泵单元以及氧离子导电 固体电解质将主要测量元件限制在气体扩散控制空间内，并具有小的气体扩散孔。 主要测量元件形成有中心位于气体扩散孔正下方的中心开口，以便减少施加在氧气泵室上的负担并防止传感器响应特性中的过冲。 氧传感器单元可以由与用于测量主要元件的电阻的一对电极连接的过渡金属氧化物的主要测量元件组成，或者可以由夹在参考的氧离子导电固体电解质基底 电极和用作测量电极的初级测量元件。

公开(公告)号：US4786476A

公开(公告)日：1988-11-22

申请号：US886080

申请日：1986-07-16

申请人： Fumio Munakata ,  Masayuki Touda ,  Masaaki Uchida ,  Fumio Yukawa

发明人： Fumio Munakata ,  Masayuki Touda ,  Masaaki Uchida ,  Fumio Yukawa

IPC分类号： G01N27/12 ,  G01N27/46

CPC分类号： G01N27/12

摘要： The invention relates to a gas sensor element which utilizes a change in the electric resistance of a porously fired TiO.sub.2 layer. To improve the speed of response of the gas sensor element, and also to strengthen the adhesion of the fired TiO.sub.2 layer to a ceramic substrate, at least one kind of metal oxide which hardly undergoes solid phase reaction with TiO.sub.2 and serves as a sintering suppressing agent, such as Er.sub.2 O.sub.3, Sm.sub.2 O.sub.3 and/or In.sub.2 O.sub.3, is added to TiO.sub.2 in advance of firing. The speed of response is further enhanced by the addition of at least one kind of noble metal such as Pt and/or Rh to TiO.sub.2 together with the sintering suppressing oxide(s).

摘要翻译： 本发明涉及一种气体传感器元件，其利用烧结TiO 2层的电阻的变化。 为了提高气体传感器元件的响应速度，并且还增强了烧结的TiO 2层与陶瓷基板的粘附性，至少一种与TiO 2几乎不发生固相反应并用作烧结抑制剂的金属氧化物 ，例如Er 2 O 3，Sm 2 O 3和/或In 2 O 3。 与烧结抑制氧化物一起添加至少一种贵金属如Pt和/或Rh至TiO 2，进一步提高了响应速度。

公开(公告)号：US5050083A

公开(公告)日：1991-09-17

申请号：US414002

申请日：1989-09-29

申请人： Masaaki Uchida ,  Hideki Uema ,  Fumio Yukawa ,  Kunifumi Sawamoto ,  Toyaki Nakagawa ,  Naoki Nakada

发明人： Masaaki Uchida ,  Hideki Uema ,  Fumio Yukawa ,  Kunifumi Sawamoto ,  Toyaki Nakagawa ,  Naoki Nakada

IPC分类号： F02D41/14

CPC分类号： F02D41/1406 ,  F02D41/1473 ,  F02D2041/1426 ,  F02D2041/1433 ,  F02D41/1404 ,  Y10S706/90

摘要： A system and method for controlling an air/fuel mixture for an internal combustion engine are disclosed in which an integration constant used for a calculation of an integration portion included in a feedback correction coefficient (.alpha.) of the air/fuel mixture ratio after a relationship between an actual air/fuel mixture raito and target (stoichiometric) air/fuel mixture ratio has been inverted is set and varied according to an engine driving condition, so that the integration constant meets requirements of a stability during an engine steady driving condition and a favorable responsive characteristic during an engine transient condition. In a preferred embodiement, a fuzzy control is applicable to the calculation of the integration constant.

摘要翻译： 公开了一种用于控制用于内燃机的空气/燃料混合物的系统和方法，其中用于计算包括在关系之后的空气/燃料混合比的反馈校正系数（α）中的积分部分的积分常数 实际的空气/燃料混合物和目标（化学计量）空气/燃料混合比已经被反转，根据发动机的运行条件而变化，使得积分常数满足在发动机稳定行驶状态下的稳定性要求， 在发动机瞬态状态下具有良好的响应特性。 在优选的实施例中，模糊控制适用于积分常数的计算。

公开(公告)号：US5623824A

公开(公告)日：1997-04-29

申请号：US198395

申请日：1994-02-18

申请人： Fumio Yukawa ,  Tsutomu Kikuchi

发明人： Fumio Yukawa ,  Tsutomu Kikuchi

IPC分类号： F02D41/14 ,  F02D41/34 ,  F01N3/28

CPC分类号： F02D41/1408 ,  Y02T10/22

摘要： An air-fuel ratio control system for an automotive internal combustion engine provided with a three-way catalytic converter disposed in an exhaust gas passageway of the engine. The air-fuel ratio control system is comprised of an oxygen sensor disposed in the exhaust gas passageway downstream of the catalytic converter. The air-fuel ratio of air-fuel mixture to be supplied to the engine is controlled toward a stoichiometric value to cause the three-way catalytic converter to efficiently work under the action of a control unit including a microcomputer. In the control unit, a control constant is set in accordance with the output voltage of the oxygen sensor, and a cycle signal (pulse signal) is cyclically generated. The control constant is compulsorily minutely vibrated under the action of the cycle signal, thereby obtaining an air-fuel ratio correction coefficient. The amount of fuel to be supplied to the engine is calculated in accordance with the air-fuel ratio correction coefficient and injected from a fuel injector valve.

摘要翻译： 一种用于汽车内燃机的空燃比控制系统，其设置有设置在发动机的废气通道中的三元催化转化器。 空燃比控制系统由设置在催化转化器下游的废气通道中的氧传感器构成。 向发动机供给的空气燃料混合物的空燃比被控制为化学计量值，使得三元催化转化器在包括微型计算机的控制单元的作用下有效地工作。 在控制单元中，根据氧传感器的输出电压来设定控制常数，并循环地产生周期信号（脉冲信号）。 控制常数在循环信号的作用下强制微小地振动，从而获得空燃比校正系数。 根据空燃比校正系数计算供给发动机的燃料量，并从燃料喷射阀喷射。