Method and apparatus for enabling lean engine operation upon engine start-up
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United States of America Patent
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Mar 26, 2002
Grant Date -
N/A
app pub date -
Mar 17, 2000
filing date -
Mar 17, 2000
priority date (Note) -
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Abstract
A method and system for controlling the operation of 'lean-burn' internal combustion engines, wherein initial values for measures representing current levels of NO.sub.x and SO.sub.x stored in an emissions control device, such as a lean NO.sub.x trap, upon vehicle start-up are determined based at least in part upon values for the measures immediately preceding engine shut-off. Such initial values obviate the need for performing a purge event immediately upon engine start-up in appropriate circumstances, such as a brief engine shut-down, whereby the fuel economy penalty associated with such an initial purge event is avoided.
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