Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1997-04-04
1999-07-20
Denion, Thomas E.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60278, 60286, 60301, F01N 300
Patent
active
059242809
ABSTRACT:
Exhaust gas recirculation and selective catalytic reduction with urea or other NO.sub.x - reducing reagent are employed to enable good fuel economy and low emissions from diesel and lean-burn gasoline engines. EGR is operated at low-load, as well as when problems are experienced with reagent supply or the SCR unit. The SCR is run at its optimum operating conditions of normal to high load, supplanting the need for EGR. The net effect is a circumvention of the known tradeoff between NO.sub.x and poor fuel economy. The novel application of SCR and EGR in combination will provide engines that meet low emissions requirements with existing technology.
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Heimrich, Martin J., "Demonstration of Lean NOx Catalytic Converter Technology on a Heavy-Duty Diesel Engine"; SAE Paper No. 970755, International Congress & Exposition; Detroit, MI; Feb. 24-27, 1997.
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Clean Diesel Technologies, Inc.
Denion Thomas E.
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