发明授权
- 专利标题: Air fuel ratio detection apparatus
- 专利标题(中): 空燃比检测装置
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申请号: US11604218申请日: 2006-11-27
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公开(公告)号: US07964073B2公开(公告)日: 2011-06-21
- 发明人: Masamichi Hiraiwa , Takeshi Kawai , Satoshi Teramoto , Shigeki Mori , Hiroshi Inagaki
- 申请人: Masamichi Hiraiwa , Takeshi Kawai , Satoshi Teramoto , Shigeki Mori , Hiroshi Inagaki
- 申请人地址: JP Aichi
- 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: JP Aichi
- 代理机构: Sughrue Mion, PLLC
- 优先权: JP2005-342937 20051128
- 主分类号: G01N27/419
- IPC分类号: G01N27/419
摘要:
Using a gas detection voltage Vs output from a terminal CU, a determination is made at to whether, after startup of an air-fuel ratio detection apparatus (1), a full-range air-fuel ratio sensor (10) has reached a semi-activated state in which a determination can be made as to whether the air-fuel ratio is on the rich or lean side based on a change in a gas detection signal Vic. After determining that the sensor has reached the semi-activated state, the signal Vic is compared with a threshold to determine whether the air-fuel ratio is on the rich or lean side. In the apparatus (1), the potential difference between an outer pump electrode of a pump cell (14) and a reference electrode of an oxygen concentration measurement cell (24) is obtained via a first differential amplification circuit (53) as the gas detection signal Vic, the signal Vic being highly responsive to a change in air-fuel ratio of exhaust gas.
公开/授权文献
- US20070119437A1 Air fuel ratio detection apparatus 公开/授权日:2007-05-31