Ethanol-gasoline blended fuels have been widely implemented in Indian markets followed by the GOIs road map as ethanol reduces life-cycle greenhouse gas emissions and improves anti-knock performance. However, its effects on engine out emissions including particulate matter (PM) from gasoline direct injection (GDI) engines still need further investigation.
In this study, the effect of ethanol blended gasoline fuels with various blended rates (0%, 10%, 20%) on emissions and catalyst conversion efficiencies on a 1.2-liter 3-cylinder turbo GDI miller cycle engine is investigated. The addition of ethanol to gasoline fuel enhances the RON of the blended fuels, and oxygen content and changes the distillation temperature. Advancing Ignition timing, lambda biasing, Mode based SOI has been tested.
Test bench results indicated that with the E10 blend all pollutant conversion is at 98% in all operating points. With E20 blend the NOx emission conversion efficiency is dropped to ~60%. However, this can be improved to 98% through rich fuel biasing.
ethanol-gasoline has positive effects on PM emissions control, as the soot oxidation activity is improved, and the particle number concentrations are reduced at part and high engine loads
NEDC Results indicated a significant PN reduction with E20 compared to E0.
Keywords: Gasoline direct injection, Miller Cycle, Emission, Sweeps, Injection mode, Combustion stability, Mixture formation, CO2, Fuel consumption