Deteriorated state evaluation device for exhaust emission control equipment
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United States of America Patent
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-
Dec 27, 2005
Grant Date -
Sep 2, 2004
app pub date -
Aug 23, 2002
filing date -
Sep 5, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A humidity sensor 4 is disposed downstream of an exhaust gas purifier comprising a hydrocarbon adsorbing catalyst 2, and an air-fuel ratio sensor 5 is disposed at least downstream of the exhaust gas purifier. The hydrocarbon adsorbing ability of a hydrocarbon adsorbent of a hydrocarbon adsorbing catalyst 2 (the exhaust gas purifier) is evaluated using output data of the humidity sensor 4. The unburned gas purifying ability based on a catalytic action of the hydrocarbon adsorbing catalyst 2 is evaluated using output data of the air-fuel ratio sensor 5. Based on the evaluated results, the overall deteriorated state of the exhaust gas purifier is evaluated. The overall deteriorated state of the exhaust gas purifier which has the hydrocarbon adsorbing catalyst 2 can thus adequately be evaluated.
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