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The study of Diesel-HCCI combustion for blended alcohols in Diesel-like fuel was performed in this experimental work to quantify their impact on the net heat release rate. Ethanol and n-butanol were two representative alcohols and were blended with n-heptane; by varying mole percentage from 0, 18, 37 and 57 and varying dilutions with simulated Exhaust Gas Recirculation (EGR) from 0, 20 and 40 percent. The engine speed, intake temperature and equivalence ratio were set at 1500 rpm, 80 °C and 0.3 respectively. The impacts of alcohols were compared with the Primary Reference Fuels by blending n-heptane with iso-octane at the same molar percentage and were tested at same conditions. The results show that blended fuels and dilution with EGR can delay the combustion in different ways. Increasing the EGR rate retards combustion by increasing contained inert species.

Formerly, the Hydro-treated Vegetable Oil (HVO) blended fuels has been studied by running the New European Driving Cycle (NEDC) and found that the higher HVO blended fuel can suppress NOX, lowering the particulate matter (PM) while improving the vehicle fuel economy. The result also shown that the 20% HVO + 5%FAME blended with diesel fuel has been proven to compatible with the advance diesel engine technology via the severe engine durability tests and fuel injection system tests. Therefore, the effects of two paraffinic diesel fuels, which are Gas-to-Liquid (GTL) and Hydro-treated Vegetable Oil (HVO), on a common-rail DI diesel engine have been mainly focused in this work. The main objective of this work was to study the relationships between fuel properties and theirs combustion characteristics by analyzing cylinder pressure data and exhaust emissions intensively.

The effects of high quality biodiesel, namely, partially Hydrogenated Fatty Acid Methyl Ester or H-FAME, on 50,000km on-road durability test of unmodified common-rail vehicle have been investigated. Thailand popular brand new common-rail light duty vehicle, Isuzu D-Max Spacecab, equipped with 4JK1-STD engine (DOHC 4-cylinder 2.5L, M/T 4×2, Euro III emission) was chosen to undergo on-road test composed of well-mixed types of mountain, suburb and urban road conditions over the entire 50,000km. Jatropha-derived high quality biodiesel, H-FAME, conforming to WWFC (worldwide fuel charter) specification, was blended with normal diesel (Euro IV) at 10% (v/v) as tested fuel. Engine performance (torque and power), emission (CO, NOx, HC+NOx and PM), fuel consumption and dynamic response (0-100km acceleration time and maximum velocity) were analyzed at initial, middle and final distance; whereas, used lube oil analysis was conducted every 10,000km.