Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...
Reexamination Certificate
2006-09-20
2008-12-30
Tran, Binh Q. (Department: 3748)
Power plants
Internal combustion engine with treatment or handling of...
By means producing a chemical reaction of a component of the...
C060S274000, C060S276000, C060S297000, C060S301000, C060S303000
Reexamination Certificate
active
07469531
ABSTRACT:
A method and apparatus to control injection of a reductant into the exhaust gas feedstream of an internal combustion engine adapted to operate in a lean air/fuel ratio region upstream of a catalytic reactor device is provided. A control module is operatively connected to the reductant metering device, and, adapted to effect flow of reductant into the exhaust gas feedstream. The method includes determining a preferred dosing ratio based upon parameters of the exhaust gas feedstream and the catalytic reactor device, and adjusting the preferred dosing ratio. A preferred reductant feed rate is determined, and the reductant is selectively dispensed at the preferred reductant feed rate.
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GM Global Technology Operations Inc.
Tran Binh Q.
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