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    Oxygen sensor
    2.
    发明公开
    Oxygen sensor 有权
    氧传感器

    公开(公告)号：EP0933630A1

    公开(公告)日：1999-08-04

    申请号：EP99101267.5

    申请日：1999-01-23

    申请人： NGK SPARK PLUG CO., LTD ,  HONDA MOTOR COMPANY LTD.

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

    IPC分类号： G01N27/407

    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 ΔP(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 ΔP/Q 2 is 3.2×10 -5 (atm·min 2 ·1 -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： 氧传感器配置在内燃机的废气净化催化剂的后方，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，在陶瓷体2的内表面上的参考电极3和在检测电极4的外表面上的尖晶石保护层5 传感器元件1的前端被设置有具有通孔11a的外部分隔壁11和具有通孔12a的内部分隔壁12的保护盖10覆盖。 当体积流量Q（l / min）的大气从外部流入保护罩10时，在保护罩10的内外的压力差为ΔP（atm）的情况下， ΔP/ Q2为3.2×10-5（atm·min2·1-2）。 当传感器元件1的表面温度在传感器活性温度的范围内变化时，反转时间基本恒定。 因此，氧传感器能够高精度地检测催化剂劣化。

    Oxygen Sensor
    3.
    发明公开
    Oxygen Sensor 审中-公开
    氧传感器

    公开(公告)号：EP0919807A1

    公开(公告)日：1999-06-02

    申请号：EP98122361.3

    申请日：1998-11-25

    申请人： NGK Spark Plug Co. Ltd. ,  HONDA MOTOR COMPANY LTD.

    发明人： Mizutani, Akio ,  Okawa, Teppei ,  Isomura, Hiroshi ,  Kubota, Hiroshi, c/o Honda Motor Co., Ltd. ,  Hosogai,Seiichi, c/o Honda Motor Co., Ltd. ,  Fujita, Hiroyuki, c/o Honda Motor Co., Ltd.

    IPC分类号： G01N27/407

    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 µm. 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： 公开了一种配置在使用H / C比为3以上的含烃燃料的发动机的废气净化催化剂之前的氧传感器。 氧气传感器1具有能够产生与参考气体和测量气体的氧浓度差的固体电解质体2，形成在固体电解质体2的内表面和外表面上的参比电极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仅由像Pt那样的促进甲烷氧化反应的金属形成以具有1至2μm的厚度。 在保护层5中，仅第二保护层5b承载促进氢的氧化反应的Pt催化剂6，并且承载催化剂的量相对于整个第二保护层5b在0.5至7mol％的范围内。 根据氧传感器1，即使例如来自CNG发动机的大量氢被耗尽，或者即使大量甲烷耗尽，也可以实现优异的发动机控制。

    Gas sensor
    7.
    发明公开
    Gas sensor 有权
    气体传感器

    公开(公告)号：EP0978721A1

    公开(公告)日：2000-02-09

    申请号：EP99306212.4

    申请日：1999-08-05

    申请人： NGK SPARK PLUG CO., LTD

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

    IPC分类号： G01N27/407

    CPC分类号： G01N27/4077

    摘要： There is disclosed a gas sensor having a multiple protector structure and providing uniform response or output characteristic irrespective of the direction of the gas stream relative to the protector. This protector has a first cylindrical portion (6b), and a second cylindrical portion (6a) having a sidewall. The front end of the second cylindrical portion protrudes beyond the front end ofthe first cylindrical portion. Second side gas inlets are formed in the sidewall to introduce gas under measurement. The first cylindrical portion (6b) has a tapering portion (62) having a base end and a front end. The introduced gas flows along the outer surface of the tapering portion of the first cylindrical portion from the base end toward the front end and flows out from a second side gas outlet (64). A first side gas outlet (62) is formed at the front end of the tapering portion. The stream of the gas flowing in this way produces a negative pressure in the first side gas outlet, evacuating the inside of the first cylindrical portion. As a result, the gas is drawn into the first cylindrical portion almost isotropically from the circumferentially spaced first side gas inlets. The gas is supplied to a detection portion inside the protector almost isotropically irrespective of the angle at which the gas stream strikes the surface of the detection portion. Accordingly, uniform response or output characteristic is obtained regardless of the direction of the gas stream.

    摘要翻译： 公开了一种气体传感器，其具有多重保护结构并提供均匀的响应或输出特性，而与气流相对于保护器的方向无关。 该保护器具有第一圆柱形部分（6b）和具有侧壁的第二圆柱形部分（6a）。 第二圆柱形部分的前端突出超过第一圆柱形部分的前端。 在侧壁中形成第二侧气体入口以引入被测量的气体。 第一圆柱形部分（6b）具有锥形部分（62），该锥形部分具有基端和前端。 引入的气体沿着第一圆柱形部分的锥形部分的外表面从基端朝向前端流动并且从第二侧出气口（64）流出。 第一侧面气体出口（62）形成在锥形部分的前端。 以这种方式流动的气体流在第一侧气体出口中产生负压，从而排空第一圆柱形部分的内部。 结果，气体从周向隔开的第一侧气体入口几乎各向同性地被吸入第一圆柱形部分。 无论气流撞击检测部分的表面的角度如何，气体都几乎各向同性地供给到保护器内部的检测部分。 因此，无论气流的方向如何，均可获得均匀的响应或输出特性。