Emission device temperature control system
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United States of America Patent
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Feb 20, 2001
Grant Date -
N/A
app pub date -
May 19, 1999
filing date -
May 19, 1999
priority date (Note) -
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Abstract
A nitrous oxide trap temperature control system for desulfating the trap uses and engine with some cylinders operating with lean combustion and some cylinders operating with rich combustion. The lean and rich combustion gases are combined to form an mixture which is fed to the trap to provide an exothermic reaction. The desired lean and rich air/fuel ratios of the respective lean and rich cylinders are limited depending on trap temperature and incremental heat addition to prevent inadvertently decreasing trap temperature.
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