发明名称 |
Method and apparatus for detecting exhaust gas sensor defect |
摘要 |
An air-fuel ratio sensor that outputs a sensor signal used for the feedback control of an air-fuel ratio is provided. It is determined whether an element crack is present by applying a reverse voltage to the air-fuel ratio sensor. The value of the sensor signal output from the air-fuel ratio sensor is corrected during a time period "A". The time period "A" consists of a reverse-voltage application time period in which the reverse voltage is applied, and a return time period "T" after application of the reverse voltage ends. The return time period "T" is set based on sensor impedance correlated with the internal resistance of the air-fuel ratio sensor. The return time period "T" decreases as the sensor impedance decreases.
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申请公布号 |
US2006277971(A1) |
申请公布日期 |
2006.12.14 |
申请号 |
US20060448794 |
申请日期 |
2006.06.08 |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
TASHIRO KENJI;IWAZAKI YASUSHI;KANAMARU MASANOBU;SAWADA HIROSHI;KAWAJI MASAYA;MATSUI TAKASHI |
分类号 |
G01N33/00 |
主分类号 |
G01N33/00 |
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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