Apparatus for distinguishing liquid reducing agent and exhaust emission control apparatus of engine
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United States of America Patent
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Oct 23, 2012
Grant Date -
Jan 7, 2010
app pub date -
Sep 15, 2009
filing date -
Mar 29, 2007
priority date (Note) -
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Abstract
An apparatus for distinguishing a liquid reducing agent which judges empty with a higher precision than heretofore is provided. The apparatus for distinguishing a liquid reducing agent is provided with a concentration sensor and a liquid-level sensor in storage tank of liquid reducing agent, and is characterized in that empty is judged by utilizing the liquid-level based on the liquid-level sensor in addition to the concentration based on the concentration sensor (step 3 and step 5). Even if a bubble is adhering to the concentration sensor and an erroneous signal indicative of empty is output although the residual quantity of liquid reducing agent is sufficient, the liquid-level sensor does not output a signal indicative of empty. Consequently, erroneous judgment is prevented and accurate judgment can be made as compared to heretofore.
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