发明授权
US5976350A Method of and apparatus for detecting an activated condition of a wide
range air-fuel ratio sensor
失效
用于检测大范围空燃比传感器的激活状态的方法和装置
- 专利标题: Method of and apparatus for detecting an activated condition of a wide range air-fuel ratio sensor
- 专利标题(中): 用于检测大范围空燃比传感器的激活状态的方法和装置
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申请号: US920722申请日: 1997-08-29
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公开(公告)号: US5976350A公开(公告)日: 1999-11-02
- 发明人: Tessho Yamada , Takeshi Kawai , Yuji Oi , Shigeki Mori , Satoshi Teramoto , Toshiya Matsuoka
- 申请人: Tessho Yamada , Takeshi Kawai , Yuji Oi , Shigeki Mori , Satoshi Teramoto , Toshiya Matsuoka
- 申请人地址: JPX Nagoya
- 专利权人: NGK Spark Plug Co., Ltd.
- 当前专利权人: NGK Spark Plug Co., Ltd.
- 当前专利权人地址: JPX Nagoya
- 优先权: JPX8-247074 19960829
- 主分类号: G01N27/419
- IPC分类号: G01N27/419 ; F02D41/14 ; G01N27/406 ; G01N27/407
摘要:
A method of detecting an activated condition of a wide range air-fuel ratio sensor is provided. With this method, application of a current to a heater is started idiately after an engine is started (S00). Then, a current Icp for pumping is passed through an electromotive force cell (S10). A lapse of a predetermined time Tin is waited for (S18). After a lapse of time Tin, a voltage Vs across both electrodes of the electromotive force cell is detected (S20) and labeled as Vs0 (S22). Then, application of Icp is suspended (S30) and a routine is held on standby until a time of 25 ms elapses (S35). At the point of time when the time of 25 ms has elapsed, the voltage across the electrodes on the opposite sides of the electromotive force cell is detected (S40) and labeled as Vs1 (S45). A resistance value Rs1 is calculated from Vs0, Vs1 and Icp (S50). The resistance value Rs1 is compared with a value Rss which has been prepared previously (S55) and it is judged, when Rs1 is smaller than Rss, that the electromotive force cell has been put into an activated condition. An apparatus for detecting an activated condition of a wide range air-fuel ratio sensor is also provided.
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