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Emission characteristics (NOx and particulate matter) of a CI engine are influenced by fuel properties, engine operating conditions and the type of engine technology used. The current study is focused on analyzing the effect of fuels (blend of 50% hexadecane with 50% petro-diesel (HD50), hydro-processed renewal diesel (HRD) and petro-diesel) possessing different cetane number and operating parameters of the engine on NOx and particulate matter (PM). The design of experiment (DOE) technique was employed to identify the most dominant parameter among CN, speed and torque that affect NOx emissions significantly. An empirical correlation between NOx emissions and CN, engine speed, torque and in-cylinder peak pressure was developed using Rayleigh’s method. Combustion analysis (in-cylinder pressure, heat release, combustion temperature and mass fraction burn) of the engine fueled with these fuels was also undertaken to corroborate the emission results.

Ethanol is considered as a clean and sustainable alternative fuel for spark ignited engines due to its high octane number and lesser contribution towards vehicle exhaust emissions particularly CO and HC emissions. But it adversely affects the fuel economy of a vehicle. Also, it's a known fact that lower viscosity grade engine oil improves the fuel economy of a vehicle. In this paper, role of lower viscosity grade engine oil on fuel economy of vehicle running on different blends of ethanol/gasoline was explored. In light of it an experimental study was conducted initially on a High Frequency Reciprocating Rig (HFRR) to investigate the lubricity characteristics (friction coefficient and wear) of engine lubricant of different viscosity grade according to the ASTM G133/95 test method followed by a vehicle study on chassis dynamometer to study the emissions and fuel economy of a test vehicle run on gasoline and blends of ethanol/gasoline (E-5 and E-10).