Exhaust emission control apparatus of internal combustion engine and control method of the same
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United States of America Patent
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Feb 24, 2004
Grant Date -
May 15, 2003
app pub date -
Oct 31, 2002
filing date -
Nov 13, 2001
priority date (Note) -
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Abstract
The exhaust emission control apparatus is provided with a NOx catalyst for purifying exhaust gas flowing out of an internal combustion engine, and a NOx sensor for detecting a NOx concentration in exhaust gas flowing out of the NOx catalyst. The internal combustion engine and the exhaust emission control apparatus are mounted on a vehicle. The exhaust emission control apparatus calculates a total outflow amount of NOx flowing out of the NOx catalyst obtained while the vehicle runs for a predetermined distance based on a NOx concentration detected by the above-mentioned NOx sensor, calculates a NOx outflow amount per unit running distance based on the total NOx outflow amount, and supplies the NOx catalyst with exhaust gas with a rich air-fuel ratio when a NOx outflow amount per unit running distance exceeds a predetermined amount.
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