发明授权
- 专利标题: Solid electrolyte gas sensor
- 专利标题(中): 固体电解质气体传感器
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申请号: US22485申请日: 1998-02-12
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公开(公告)号: US6068747A公开(公告)日: 2000-05-30
- 发明人: Senta Tojo , Makoto Saito , Keigo Mizutani , Hiroshi Mori , Yushi Fukuda
- 申请人: Senta Tojo , Makoto Saito , Keigo Mizutani , Hiroshi Mori , Yushi Fukuda
- 申请人地址: JPX JPX
- 专利权人: Denso Corporation,Nippon Soken, Inc.
- 当前专利权人: Denso Corporation,Nippon Soken, Inc.
- 当前专利权人地址: JPX JPX
- 优先权: JPX9-074481 19970310; JPX9-074482 19970310
- 主分类号: G01N27/417
- IPC分类号: G01N27/417 ; G01N33/00 ; G01N27/407
摘要:
A gas sensor using oxygen-ion-conductive solid electrolyte layers measures a concentration of a constituent gas such as NOx in a gas mixture such as an exhaust gas mixture of an internal combustion engine. The gas sensor includes a pair of oxygen pumping cells and a sensor cell. Before the constituent gas concentration is measured by the sensor cell, oxygen gas contained in the gas mixture has to be purged because the oxygen gas adversely affects the measurement of the constituent gas concentration. Two pumping cells disposed to face a chamber, into which the gas mixture is introduced, pump out the oxygen gas contained in the gas mixture so that the oxygen concentration is reduced substantially zero. Then, the gas mixture is diffused to the sensor cell where the constituent gas concentration is measured without the adverse influence of the oxygen gas. A marginal ion current which is proportional to the constituent gas concentration is measured by the sensor cell with a high accuracy and sensitivity.
公开/授权文献
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