Exhaust emission purifying apparatus for engine
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United States of America Patent
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app pub date -
Jun 22, 2007
filing date -
Dec 24, 2004
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Abandoned
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Abstract
A technology for purifying an exhaust emission from an engine is provided, in which a misjudgment caused by a time lag between the abnormality detection and an abnormality judgment is avoided, in the case where a plurality of abnormalities is judged on the aqueous solution of a reducing agent or the like. After a first abnormality judgment (Femp=1: the time t2) is made, when a second abnormality is detected as a result that the concentration Dn as a state parameter is directly shifted from a first region A to a second region C (the time t3), the first abnormality judgment is maintained for a predetermined period of time PRD after the second abnormality detection.
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