Control of a NOX reductant delivery system
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United States of America Patent
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-
Oct 29, 2002
Grant Date -
N/A
app pub date -
Feb 22, 2000
filing date -
Feb 22, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method is disclosed for controlling the delivery of compressed air and a reductant for oxides of nitrogen to a mixer from which the air/reductant mixture flows through a nozzle and into an exhaust gas created by a combustion engine. A control signal provided to an air compressor is varied as the exhaust gas pressure changes to maintain a predetermined differential pressure across the nozzle. The desired flow rate of reductant into the exhaust gas is calculated based upon the engine speed, engine load, catalyst temperature, and gas space velocity flowing through the catalyst. A reductant control signal, based upon the calculated reductant flow rate, is provided to a metering pump that delivers the reductant into the mixer. Calculations of the reductant control signal take into account the air pressure that the reductant pump sees inside the mixer.
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