Method and system for preconditioning an emission control device for operation about stoichiometry
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United States of America Patent
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Apr 1, 2003
Grant Date -
Dec 19, 2002
app pub date -
Jun 19, 2001
filing date -
Jun 19, 2001
priority date (Note) -
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Abstract
An exhaust gas treatment system for an internal combustion engine includes a three-way catalyst and a NO.sub.x device located downstream of the three-way catalyst. The device is preconditioned for emissions reduction at engine operating conditions about stoichiometry by substantially filling the device with oxygen and NO.sub.x ; and purging stored oxygen and stored NO.sub.x from only an upstream portion of the device, whereupon the upstream portion of the device operates to store oxygen and NO.sub.x during subsequent lean transients while the downstream portion of the device operates to reduce excess HC and CO during subsequent rich transients.
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