Method and apparatus for desulfating a NOx trap
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United States of America Patent
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Mar 13, 2001
Grant Date -
N/A
app pub date -
Sep 14, 1999
filing date -
Aug 29, 1997
priority date (Note) -
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Abstract
A method and apparatus for desulfating a NO.sub.x trap is proposed wherein the SO.sub.x purge temperature is achieved by modulating the amplitude of the A/F of the mixture supplied to the engine thereby storing oxygen in the trap during lean engine cylinder events and generating the required exotherm during rich engine cylinder events.
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