公开(公告)号：USRE33980E

公开(公告)日：1992-06-30

申请号：US517749

申请日：1990-05-02

申请人： Toshitaka Matsuura ,  Teppei Okawa ,  Keizo Furusaki ,  Akio Takami

发明人： Toshitaka Matsuura ,  Teppei Okawa ,  Keizo Furusaki ,  Akio Takami

IPC分类号： G01N27/12

CPC分类号： G01N27/12

摘要： A laminar gas-sensitive thick film consisting of ceramic semiconductor and metallic catalyzer is formed across a pair of electrodes carried by a ceramic substrate, and the nature of metallic catalyzer on an outer surface layer of the thick film is different from that of metallic catalyzer in that portion of the thick film which is in the proximity of the electrodes.

公开(公告)号：US4857275A

公开(公告)日：1989-08-15

申请号：US27357

申请日：1987-03-18

申请人： Keizo Furusaki ,  Mineji Nasu ,  Toshitaka Matsuura ,  Akio Takami ,  Teppei Okawa

发明人： Keizo Furusaki ,  Mineji Nasu ,  Toshitaka Matsuura ,  Akio Takami ,  Teppei Okawa

IPC分类号： G01N27/12 ,  G01N27/22

CPC分类号： G01N27/12

摘要： A laminar gas-sensitive thick film consisting of ceramic semiconductor and metallic catalyzer is formed across a pair of electrodes carried by a ceramic substrate, and the nature of metallic catalyzer on an outer surface layer of the thick film is different from that of metallic catalyzer in that portion of the thick film which is in the proximity of the electrodes.

摘要翻译： 由陶瓷半导体和金属催化剂组成的层状气体敏感膜由穿过陶瓷基板的一对电极形成，并且厚膜外表面层上的金属催化剂的性质与金属催化剂的性质不同 位于电极附近的厚膜的那部分。

公开(公告)号：US06210552B1

公开(公告)日：2001-04-03

申请号：US09199319

申请日：1998-11-25

申请人： Akio Mizutani ,  Teppei Okawa ,  Hiroshi Isomura ,  Hiroshi Kubota ,  Seiichi Hosogai ,  Hiroyuki Fujita

发明人： Akio Mizutani ,  Teppei Okawa ,  Hiroshi Isomura ,  Hiroshi Kubota ,  Seiichi Hosogai ,  Hiroyuki Fujita

IPC分类号： G01N27407

CPC分类号： G01N27/4071

摘要： There is disclosed an oxygen sensor disposed before an exhaust gas purifying catalyst of an engine which uses a hydrocarbon containing fuel with a H/C ratio of three or more. An oxygen sensor 1 is provided with a solid electrolytic body 2 which can generate a difference in oxygen concentration with reference gas and measured gas, a reference electrode 3 and a detection electrode 4 formed on inner and outer surfaces of the solid electrolytic body 2, and a porous protective layer 5 for covering the detection electrode 4. The detection electrode 4 is formed only of a metal like Pt which promotes oxidizing reaction of methane to have a thickness of 1 to 2 &mgr;m. In the protective layer 5, only a second protective layer 5b carries Pt catalyst 6 which promotes oxidizing reaction of hydrogen, and the amount of carried catalyst is in the range of 0.5 to 7 mol % relative to the whole of the second protective layer 5b. According to the oxygen sensor 1, even if a large amount of hydrogen is exhausted, for example, from CNG engine, or even if a large amount of methane is exhausted, an excellent engine control can be realized.

摘要翻译： 公开了使用H / C比为3以上的烃类燃料的发动机的排气净化催化剂之前设置的氧传感器。 氧传感器1设置有固体电解体2，其可以产生与参考气体和测量气体的氧浓度差，形成在固体电解体2的内表面和外表面上的参考电极3和检测电极4，以及 用于覆盖检测电极4的多孔保护层5.检测电极4仅由促进甲烷的氧化反应的具有1〜2μm厚度的金属Pt形成。 在保护层5中，仅第二保护层5b携带促进氢的氧化反应的Pt催化剂6，并且所携带的催化剂的量相对于整个第二保护层5b为0.5〜7摩尔％。 根据氧传感器1，即使例如从CNG发动机排出大量的氢，即使大量的甲烷被排出，也能够实现良好的发动机控制。

公开(公告)号：US06346179B1

公开(公告)日：2002-02-12

申请号：US09368953

申请日：1999-08-05

申请人： Keisuke Makino ,  Shinya Awano ,  Mitsunori Oi ,  Takashi Nakao ,  Teppei Okawa

发明人： Keisuke Makino ,  Shinya Awano ,  Mitsunori Oi ,  Takashi Nakao ,  Teppei Okawa

IPC分类号： G01N27407

CPC分类号： G01N27/4077

摘要： A gas sensor including a detection element having a front-end portion, a detection portion formed at the front-end portion of the detection element, and a protector that covers the detection portion. The protector includes a first portion having a first sidewall and a second portion having a second sidewall disposed outside the first portion. The first sidewall has an axial front end and a tapering portion. The tapering portion is formed from the axial front end of the first sidewall. The side portion has a front-end surface provided with a first gas outlet, and the second portion has a front-end surface provided with a second gas outlet. Furthermore, at least one gas inlet is formed to the sidewall of the second portion opposite the tapering portion, and plural gas inlets are formed on the sidewall of the first portion.

摘要翻译： 一种气体传感器，包括具有前端部分的检测元件，形成在检测元件的前端部分的检测部分和覆盖检测部分的保护器。 保护器包括具有第一侧壁的第一部分和具有设置在第一部分外侧的第二侧壁的第二部分。 第一侧壁具有轴向前端和锥形部分。 锥形部分由第一侧壁的轴向前端形成。 侧部具有设置有第一气体出口的前端表面，并且第二部分具有设置有第二气体出口的前端表面。 此外，至少一个气体入口形成在与锥形部分相对的第二部分的侧壁上，并且多个气体入口形成在第一部分的侧壁上。

公开(公告)号：US06182498B2

公开(公告)日：2001-02-06

申请号：US09236336

申请日：1999-01-25

申请人： Akio Mizutani ,  Teppei Okawa ,  Hiroshi Kubota ,  Seiichi Hosogai ,  Hiroyuki Fujita

发明人： Akio Mizutani ,  Teppei Okawa ,  Hiroshi Kubota ,  Seiichi Hosogai ,  Hiroyuki Fujita

IPC分类号： G01N1910

CPC分类号： G01N27/4077

摘要： An oxygen sensor is disposed behind an exhaust gas purifying catalyst for an internal combustion engine and which suppresses the influence of unburnt hydrocarbon on the output voltage. A sensor element 1 is provided with a detection electrode 4 on the outer face of a zirconia ceramic body 2, a reference electrode 3 on the inner face of the ceramic body 2 and a spinel protective layer 5 on the outer surface of the detection electrode 4. The tip end of the sensor element 1 is covered with a protective cover 10 which is provided with an outer partition wall 11 having through holes 11a and an inner partition wall 12 having through holes 12a. In a case where the pressure difference between the inside and outside of the protective cover 10 is &Dgr;P(atm) when the atmospheric air with a volume flow rate Q(L/min) is passed into the protective cover 10 from the outside, the ratio &Dgr;P/Q2 is 3.2×10−5 (atm·min2·L−2). When the surface temperature of the sensor element 1 is changed in a range of sensor active temperature, the reversing time is substantially constant. Therefore, the catalyst deterioration can be detected by the oxygen sensor with high accuracy.

摘要翻译： 氧传感器设置在用于内燃机的废气净化催化剂的后面，并且抑制未燃烧的碳氢化合物对输出电压的影响。 传感器元件1在氧化锆陶瓷体2的外表面上设置有检测电极4，陶瓷体2的内表面上的参考电极3和检测电极4的外表面上的尖晶石保护层5 传感器元件1的前端用保护盖10覆盖，保护盖10设有具有通孔11a的外分隔壁11和具有通孔12a的内分隔壁12。 在体积流量Q（L / min）从外部进入保护罩10的大气中，保护罩10的内外压差为DELTAP（atm）的情况下， DELTAP / Q2为3.2×10-5（atm.min2.L-2）。 当传感器元件1的表面温度在传感器有效温度的范围内变化时，反转时间基本上是恒定的。 因此，可以通过氧传感器高精度地检测催化剂劣化。