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US 2010/0300073 A1Published application
PASSIVE NOx AND PM AFTERTREATMENT FOR DIESEL ENGINE
AssigneeSouthwest Research Institute
InventorsMagdi K. Khair, Stefan Simescu, Gary D. Neely, Vlad L. C. Ulmet
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Abstract
A method of reducing emissions by operating a diesel engine in a stoichiometric air-fuel ratio mode. To achieve an optimal stoichiometric mode, intake throttling, boost air intake control, fuel injection adjustments, and exhaust gas recirculation (EGR) are used. This mode of operation permits an aftertreatment system that has only an oxidation catalyst and a particulate filter.
Claims9
A method for reducing the particulate matter and NOx content of the exhaust gas of a diesel engine, comprising:
- operating the diesel engine in an oxygen-depleted stoichiometric mode;
- wherein the stoichiometric mode is achieved by using one or more of the following:
- intake air throttling and decreased intake air boosting;
- directing the exhaust gas from the engine to a diesel oxidation catalyst;
- and
- directing the exhaust gas from the diesel oxidation catalyst to a catalyzed diesel particulate filter.
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Dependencies are inferred from the claim text.