Influence of Ethanol and MTBE Proportion in China ⅥB Gasoline on Vehicle Particulate Emissions
With the implementation of China Ⅵ gasoline standards, the use of ethanol is expanding in China. The addition of ethanol in China Ⅵ gasoline is to further reduce emissions of gaseous and particulate matter. However, due to the constrain of biomass ethanol production, MTBE (Methyl tert-Butyl Ether) is still being used in addition of ethanol to improve fuel octane and maintain oxygen content. The impact of mixed oxygenates in fuel to vehicle emissions are studied in this paper. The correlation of fuel characteristics to vehicle particulate emission has been investigated, in particularly to well known fuel indices. Those include Honda’s particulate matter index (PMI), General Motor’s Particulate evaluation Index (PEI), and Toyota’s simplified particulate index (sPMI), etc.. The results from this study suggest some alternatives to existing fuel indices due to oxygenates contribution. In this paper, three direct-injection turbocharged models were used as the test vehicles.