Emission control system
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United States of America Patent
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Sep 17, 2002
Grant Date -
N/A
app pub date -
Apr 18, 2001
filing date -
Apr 18, 2001
priority date (Note) -
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Abstract
A method for improving NOx conversion efficiency of an exhaust gas after-treatment device is presented. The efficiency is improved by first maintaining the device at an operating temperature wherein improved storage of reductant is possible, and subsequently changing the temperature of the device to that where optimum NOx conversion efficiency is achieved, thereby obtaining and utilizing the conversion benefits of stored reductant.
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