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US 6,063,350 AGranted
Reducing no.sub.x emissions from an engine by temperature-controlled urea injection for selective catalytic reduction
AssigneeClean Diesel Technologies, Inc.
InventorsTheodore J. Tarabulski, Curtis J. Knapper, Jeremy D. Peter-Hoblyn, James M. Valentine
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Abstract
A safe, reliable SCR system for reducing NO.sub.x emissions from a lean-burn internal combustion engine utilizes urea in aqueous solution. A modular assembly is provided for mounting inside a urea reagent tank enables controlled feeding an aqueous urea solution to an injector. The assembly includes a reagent quality sensor, a reagent temperature sensor, a reagent level sensor and a pump.
Claims11
A method for reducing the emissions of NO.sub.x in an exhaust gas from a lean-burn engine, comprising:
- monitoring the quality, temperature and level of urea solution in a storage vessel;
- generating sensor signals representative of the quality, temperature and level of urea in the storage vessel;
- comparing the sensor signals to reference values;
- generating control signals representative of the results of the comparison;
- responsive to the control signals, controlling the flow of urea solution to the exhaust gas;
- and
- passing the exhaust gas through an SCR reactor.
4 more elements
Dependencies are inferred from the claim text.