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Cold Temperature Effects on Speciated VOC Emissions from Modern GDI Light-Duty Vehicles R2
Citation:
George, I., M. Hays, R. Snow, J. Faircloth, T. Long, AND R. Baldauf. Cold Temperature Effects on Speciated VOC Emissions from Modern GDI Light-Duty Vehicles R2. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-18/299, 2018.
Impact/Purpose:
EPA requires accurate and detailed speciated emissions characterization data from mobile sources to inform to emissions inventories. This information is needed by EPA’s air quality models, e.g., MOVES and CMAQ, to accurately assess the environmental and health impacts of the transportation sector. This summary highlights AEMD research using AEMDs dynamometer testing facility to study vehicle emissions from modern light-duty vehicles and the effects of cold temperature.
Description:
In this study, speciated VOC emissions were characterized from three modern GDI light-duty vehicles. The vehicles were tested on a chassis dynamometer housed in a climate-controlled chamber at two temperatures (20 and 72 °F) over the EPA Federal Test Procedure (FTP) and a portion of the Supplemental FTP (i.e. US06) that represents more aggressive driving conditions. The vehicles operated gasoline blended with 10% ethanol. VOC emissions from diluted vehicle exhaust were sampled with SUMMA canisters for EPA Method TO-15 analysis and with 2,4-Dinitrophenylhydrazine (DNPH) cartridges for carbonyl analysis by EPA Method TO-11A. This presentation will report the impact of ambient cold temperature, driving cycle, and GDI technology on speciated VOC emissions.