Heating of a storage trap
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United States of America Patent
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-
Jul 31, 2001
Grant Date -
N/A
app pub date -
Sep 17, 1999
filing date -
Apr 11, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A lean NOx trap in an exhaust system of a spark ignition internal combustion engine having a three-way catalyst upstream of the lean NOx trap, and the lean NOx trap connected in series along the exhaust system is heated by modulating the air to fuel ratio (AFR) of the engine cyclically at various frequencies such as 0.5 Hz, 1 Hz, 1.5 Hz, and 2 Hz, so that different portions of the lean NOx trap are heated at different times so as to completely remove sulfur from the lean NOx trap.
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