NOx purge air/fuel ratio selection
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United States of America Patent
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Jun 10, 2003
Grant Date -
May 29, 2003
app pub date -
Nov 29, 2001
filing date -
Nov 29, 2001
priority date (Note) -
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Abstract
A method for improving a purge conversion efficiency of a Lean NOx Trap coupled downstream of a lean-burn internal combustion engine is presented. This method recognizes that during a purge of the LNT, its temperature increases due to the exothermic reactions in the LNT. Once the LNT temperature exceeds a certain threshold, further increases lead to a reduction in the NOx storage capacity, and therefore an increase in NOx emissions during the purge of the LNT. Therefore, it is proposed to cool the LNT temperature once the threshold is exceeded. This method improves emission control and fuel economy during purge.
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