发明名称 |
Device for detecting a malfunction of air fuel ratio sensor |
摘要 |
A device is provided for detecting a malfunction of an air fuel ratio sensor disposed downstream of a catalytic converter in an exhaust passage of an engine. The device calculates a differential value of a sensor output with respect to time. Then the device compare the differential value of said sensor output with a predetermined value and calculate a frequency of the differential value of the sensor output which exceeds the predetermined value. Then the device compares the frequency with a predetermined value and determine that the sensor is malfunctioning if the frequency does not exceed the predetermined value. |
申请公布号 |
US5819195(A) |
申请公布日期 |
1998.10.06 |
申请号 |
US19960659348 |
申请日期 |
1996.06.06 |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
IWATA, YOICHI |
分类号 |
F02D41/14;F02D41/22;G01N27/26;G01N27/409;(IPC1-7):F02D41/34;G01M15/00 |
主分类号 |
F02D41/14 |
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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