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Vehicle Emission Solutions for China 6B and Euro 7
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 14, 2020 by SAE International in United States
Combinations of TWC (CC1) and coated gasoline particulate filters (CC2) were aged by 4 mode and fuel cut aging to simulate 160K kilometers of in-use aging China and Europe, respectively. The separate combinations of catalysts were then evaluated on two low emission engines using the WLTC driving cycle. Regarding the TWC CC1 catalysts both volume and PGM were varied. With respect to the gasoline particulate filters (GPF) OSC/washcoat amounts were varied at constant PGM loading. For European applications, after fuel cut aging, Euro6D emission target can be met with any combination of TWC + GPF catalysts. However, if the gaseous regulations for Euro 7 are similar to China 6B the TWC CC1 catalyst should be >1.0L in volume in order to meet CO and NOx emissions. For the Chinese applications, after the 4-mode aging again the TWC CC1 catalyst should be >1.0L in volume and high levels of OSC are needed in the GPF to meet CO and NOx emission targets. Results imply that TWC CC1 design is most critical and more washcoat (bigger volume) is more effective for emission reduction than increasing PGM. All PN measurement were well within the regulation. Further testing results suggest an additional underfloor TWC can effectively reduce CO and NOx emissions if a small <1.0L TWC CC1 catalyst has to be used.