Nox trap efficiency
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United States of America Patent
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Dec 14, 2004
Grant Date -
May 22, 2003
app pub date -
Nov 19, 2001
filing date -
Nov 19, 2001
priority date (Note) -
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Abstract
A more accurate method for determining a NOx storage efficiency of an exhaust gas aftertreatment device is presented. The method teaches determining NOx storage efficiency as a function of available LNT NOx storage capacity, which is calculated based on a ratio of an instantaneous value of an amount of NOx stored in the device and total device storage capacity at present operating conditions. Using this method prevents overfilling of the device and inefficient purging, thus improving emission control and fuel economy.
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