Exhaust emission control system and method for removal and storage of vehicle exhaust gas nitrogen oxides during cold operation
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United States of America Patent
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-
Nov 15, 2005
Grant Date -
Oct 2, 2003
app pub date -
Mar 28, 2002
filing date -
Mar 28, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system and a method for removing NOx from an internal combustion engine exhaust stream at lower temperatures, and releasing the NOx back into the exhaust stream at higher temperatures, includes an occluder with an adsorbent able to selectively adsorb NOx at temperatures below a predetermined temperature and desorb NOx at temperatures above the predetermined temperature. The system includes an engine control module that operates the engine during cold operation so as to produce an increased ratio of NO2/NO.
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