发明名称 |
Gas concentration measurement apparatus |
摘要 |
A first cell having an electrolyte and a pair of electrodes on the surface of the electrolyte with one of the electrodes facing a gas chamber causes, upon receipt of an applied voltage, a current to flow in accordance with the amount of oxygen discharge while discharging oxygen from the chamber. An open-circuit-induced fault is detected in accordance with a current flow change that is caused by the first cell when the voltage applied to the first cell reverts to a reference level after a temporary deviation from the reference level. A second cell generates a signal in accordance with the oxygen concentration in the measurement target gas chamber. An open-circuit-induced fault is detected in accordance with a signal change that is generated from the second cell when the voltage applied to the first cell reverts to a reference level after a temporary deviation from the reference level.
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申请公布号 |
US7938944(B2) |
申请公布日期 |
2011.05.10 |
申请号 |
US20040932147 |
申请日期 |
2004.09.02 |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
SUZUKI YUSUKE |
分类号 |
F01N11/00;G01N27/41;G01N27/26;G01N27/407;G01N27/416;G01N27/419;G01N33/00 |
主分类号 |
F01N11/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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