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Fuel Effects on Particulate Matter Emissions Variability from a Gasoline Direct Injection Engine
Technical Paper
2018-01-0355
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Particulate matter emissions from gasoline direct injection engines are a concern due to the health effects associated with ultrafine particles. This experimental study investigated sources of particulate matter emissions variability observed in previous tests and also examined the effect of ethanol content in gasoline on particle number (PN) concentrations and particle mass (PM) emissions. FTIR measurements of gas phase hydrocarbon emissions provided evidence that changes in fuel composition were responsible for the variability. Exhaust emissions of toluene and ethanol correlated positively with emitted PN concentrations, while emissions of isobutylene correlated negatively. Exhaust emissions of toluene and isobutylene were interpreted as markers of gasoline aromatic content and gasoline volatility respectively. Tests conducted with gasoline containing added toluene (10%) supported this hypothesis and led to the overall conclusion that the emissions variability observed in PN concentrations can be attributed to changes in the composition of the pump gasoline being used. Tests conducted with gasoline containing added ethanol (10% and 30%) found that increasing ethanol fuel content increased emitted PN concentrations at steady-state operation.
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Ramos, M. and Wallace, J., "Fuel Effects on Particulate Matter Emissions Variability from a Gasoline Direct Injection Engine," SAE Technical Paper 2018-01-0355, 2018, https://doi.org/10.4271/2018-01-0355.Data Sets - Support Documents
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