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Exhaust emission reduction system having an HC-trap and NOx-trap combination designed for operating under strategic lean conditions
Exhaust emission reduction system having an HC-trap and NOx-trap combination designed for operating under strategic lean conditions
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机译：具有HC捕集阱和NOx捕集阱组合的排气减排系统，旨在在战略性稀薄条件下运行
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摘要
Methods and systems are featured for reducing harmful exhaust gas components of combustion devices such as gasoline-powered combustion engines (e.g., predominately stoichiometric running engines). The methods and systems include an underbody combination of a hydrocarbon trap (HCT), suited for cold start hydrocarbon adsorption, as well as an associated NOx trap. The system is inclusive of a control unit for extending a lean exhaust condition reaching the desorbing HCT as to avoid a deficiency in oxygen during the time period of HCT desorption. The system is also inclusive of one or more TWCs as in one associated with the underbody HCT-NOx-trap combination and/or one positioned in a close coupled position. Platinum group metals as in Pd, Rh and Pt are also featured on one, two or all three of the HCT, NOx-trap, and TWC when present.
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