发明授权
- 专利标题: Oxygen sensor
- 专利标题(中): 氧传感器
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申请号: US09671591申请日: 2000-09-28
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公开(公告)号: US06679982B1公开(公告)日: 2004-01-20
- 发明人: Hiroshi Matsuzaki , Keiji Suzuki , Teppei Ookawa , Hiroshi Kubota , Seiichi Hosogai , Hiroyuki Fujita , Katsunori Nakamura
- 申请人: Hiroshi Matsuzaki , Keiji Suzuki , Teppei Ookawa , Hiroshi Kubota , Seiichi Hosogai , Hiroyuki Fujita , Katsunori Nakamura
- 优先权: JP9-213499 19970807; JP10-17270 19980129
- 主分类号: G01N27407
- IPC分类号: G01N27407
摘要:
An oxygen sensor is disposed downstream from a catalyst for purifying exhaust gas from an internal combustion engine and which can suppress an influence of unburnt hydrocarbon on an output voltage. After forming a platinum thin film on the outer periphery of a zirconia ceramic body, only a detection electrode of the ceramic body is dipped in a silver nitrate aqueous solution of 0.1 mol/l, and the silver nitrate is pyrolyzed through a heat treatment. Subsequently, a platinum reference electrode is formed on the inner periphery of the ceramic body. To protect the silver-doped detection electrode, a protective layer is formed on the surface of the detection electrode. By the exposure to combustion gas and through aging, a detection element is formed, and set into a metal case together with a cylindrical heater, to complete an oxygen sensor to be disposed downstream from a CNG engine catalyst.