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Cost and Fuel Economy Driven Aftertreatment Solutions -for Lean GDI- Umicore AG and Co KG
- Format:
- Conference/Event
- Author/Creator:
- Pauly, Pauly, author.
- Conference Name:
- SAE 2010 World Congress & Exhibition (2010-04-13 : Detroit, Michigan, United States)
- Language:
- English
- Physical Description:
- 1 online resource
- Place of Publication:
- Warrendale, PA SAE International 2010
- Summary:
- New fuel economy standards intensify the power train developmentfor more fuel efficient vehicles worldwide. Different approachesare utilized to improve the fuel efficiency of gasoline engines. Ofall concepts, including downsizing plus turbocharging, stratifiedoperation of spray-guided gasoline direct injection (GDI) enginesshow the greatest fuel savings benefit. A significant challenge forstratified GDI aftertreatment systems is to develop both catalystsand systems that can reduce the high amount and cost of preciousmetals currently needed to meet performance standards under lowexhaust temperature operating conditions. Furthermore, tighteremission standards will exceedingly require high conversion ratesfor HC, CO and NOx. In this paper the most recently developedcatalyst and systems for lean GDI aftertreatment will be comparedwith serial production EURO 5 systems against future legislatedtargets. One development focus is on improvement of three-waycatalysts specifically for lean GDI applications needing advancedlight-off behavior with regard to different gas atmospheres (lean,rich and λ==1).An overview on the recent development improvements of NOxstorage catalyst systems is given with regard to cost, performanceand durability. New NOx storage catalyst systems show improvedperformance in the low temperature region which allows forenlarging the usable engine-map range of stratified gasolineinjection to the lower speed/load points without additional heatingmeasures used by calibrators to rapidly heat the exhaust catalysts.By further optimization of the aftertreatment system with regard tosystem integration (catalyst volume, precious metal distribution) aconsiderable reduction in precious metal is realized with improvedover-all performance when compared to the current seriesapplications. An outlook is given for the requirements of theaftertreatment for lean GDI in the US
- Notes:
- Vendor supplied data
- Publisher Number:
- 2010-01-0363
- Access Restriction:
- Restricted for use by site license
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