Hydrocarbon adsorbent state monitoring device
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United States of America Patent
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-
Aug 16, 2005
Grant Date -
Dec 2, 2004
app pub date -
Oct 21, 2002
filing date -
Oct 19, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A characteristic change of a humidity sensor 19 is detected based on the transitional characteristics of output data of the humidity sensor 19 with respect to integrated moisture quantity data representative of an integrated amount of moisture that is supplied to an HG adsorbent 7 by an exhaust gas after an engine 1 has started to operate. A parameter for grasping a state of the HC adsorbent 7 is corrected. The state, such as a deteriorated state or the like, of a hydrocarbon adsorbent (HC adsorbent) is properly monitored while compensating for the effect of the characteristic change of the humidity sensor and the effect of variations of the characteristics of individual units of the humidity sensor.
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