Emission control system
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United States of America Patent
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Feb 6, 2001
Grant Date -
N/A
app pub date -
Jun 7, 1999
filing date -
Jun 7, 1999
priority date (Note) -
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Abstract
A reductant injection control strategy for controlling an amount of nitrogen oxide reducing agent injected upstream of a first and second serially placed nitrogen oxide catalyst, calculates the reductant injection For the first catalyst and second catalyst. The reductant injection for the first catalyst is based on engine operating conditions. The reductant injection for the second catalyst is based on the reductant injection for the first catalyst and a conversion efficiency of the first catalyst.
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