AAAR 34th Annual Conference
October 12 - October 16, 2015
Hyatt Regency
Minneapolis, Minnesota, USA
Abstract View
Characterizing Aerosol Emissions from Light Duty Gasoline Vehicles
ROYA BAHREINI, Jian Xue, Kent C. Johnson, Thomas D. Durbin, David Quiros, Shaohua Hu, Tao Huai, Alberto Ayala, Heejung S. Jung, University of California, Riverside
Abstract Number: 130 Working Group: Urban Aerosols
Abstract In an effort to characterize aerosol emissions from light duty gasoline vehicles, three vehicles equipped with traditional port-fuel injection engine (PFI) or the more modern direct injection engines (wall-guided, WG-GDI, or spray-guided, SG-GDI) were tested on the FTP (Federal Test Procedure) and US06 (Supplemental FTP Test Procedure) driving cycles. Tests were carried out at UC- Riverside’s College of Engineering- Center for Environmental Research and Technology’s light-duty chassis dynamometer facility. We used measurements of black carbon (BC) mass and aerosol optical extinction coefficient (at 632 nm) to determine emission factors of BC (EF_BC) and extinction coefficient (EF_ext) as well as single scattering albedo (SSA) of the emitted particles during different phases of the driving cycles. Highest EFs were observed for the WG-GDI engine, regardless of the driving cycle. During the FTP cycle, cold-start EF_BC and EF_ext of GDI vehicles were at least an order of magnitude higher than hot-transient phase values while for the PFI vehicle, the ratios of the cold-start to hot-transient EFs were at most a factor of 4. The lowest SSA value was observed for the WG-GDI during the cold-start phase of the FTP cycle. We present further analysis on the observed EFs and SSA in different phases of the driving cycles to understand the impact of different engine technologies on emissions.