System for controlling the urea supply to SCR catalysts
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United States of America Patent
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Feb 20, 2007
Grant Date -
Jun 22, 2006
app pub date -
Dec 20, 2004
filing date -
Dec 20, 2004
priority date (Note) -
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Abstract
A reductant dosing control system, for use in a Selective Catalytic Reduction (SCR) system of a motor vehicle includes an input receiving a NOx feedback signal from an NOx sensor provided to the SCR system. A base dosing module calculates a required quantity of reductant to inject in front of a SCR catalyst of the SCR system based on the NOx feedback signal. The SCR catalyst has ammonia storage properties. An output signals a reductant metering mechanism to periodically or continuously inject excess reductant based on the required quantity of reductant.
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