发明名称 |
Apparatus for determining a failure of an oxygen concentration sensor |
摘要 |
An apparatus for accurately and promptly determining a failure of an oxygen concentration sensor. The oxygen concentration sensor is arranged at a location downstream of a catalyst in an exhaust system of an internal combustion engine. The apparatus measures a time period elapsed after termination of a fuel cut-off operation, and calculates an integrated amount SUMSVS of exhaust gases exhausted after the termination of the fuel cut-off operation. A failure of the oxygen concentration sensor is determined depending on whether or not a signal value SVO2 of a signal from the oxygen concentration sensor has crossed a predetermined threshold value #SVO2CHK. Further, when a predetermined time period #TMFCCKD has elapsed, if the signal value SVO2 has not crossed the predetermined threshold value #SVO2CHK, and at the same time when the integrated amount SUMSVS of the exhaust gases has not reached a predetermined value #SUMSVAFC the failure determination is suspended.
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申请公布号 |
US6374818(B2) |
申请公布日期 |
2002.04.23 |
申请号 |
US20010769242 |
申请日期 |
2001.01.26 |
申请人 |
HONDA GIKEN KOGYO KABUSHIKI KAISHA |
发明人 |
SHINJYO AKIHIRO;KITAGAWA HIROSHI;MIBE TOSHIHIRO |
分类号 |
F02D41/14;F02D41/22;(IPC1-7):F02D41/22 |
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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