Method of detecting failure of humidity sensor
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United States of America Patent
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-
Aug 10, 2004
Grant Date -
Jun 12, 2003
app pub date -
Dec 6, 2002
filing date -
Dec 6, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A humidity sensor is disposed near an HC adsorbent in an exhaust system of an internal combustion engine. After the internal combustion engine is shut off, it is detected whether or not the humidity sensor has failed based on the value of the humidity detected by the humidity sensor when the detected value of the humidity is substantially constant, by determining whether or not the detected value of the humidity falls in a range between upper and lower limit thresholds that are set depending on the temperature near the HC adsorbent. It is stably and easily detected whether or not the humidity sensor disposed near the HC adsorbent in the exhaust system of the internal combustion engine has failed.
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