Adjusting Fuel Injection Timing of Fishing Vessel’s Diesel Engines When using Diesel-Vegetable Oil Blends to Increase Power and Reduce Soot Emissions

Abstract

Biofuels used for diesel engines can be biodiesel or vegetable oil. Vegetable oil can be mixed directly into traditional diesel fuel as engine fuel to reduce toxic exhaust emissions into the environment and limit dependence on non-renewable petroleum fuels. However, vegetable oil's physical and chemical properties are different from traditional diesel fuel, so when used for engines, the engine fuel system needs to be adjusted to increase power and reduce exhaust emissions, especially soot. This study used the experimental method on the Yanmar 4CHE diesel engine, and the fuel applied to the engine was a mixture of 15% coconut oil and 85% diesel oil (B15). The results showed that when B15 fuel injection timing is adjusted to increase by about 1-2 degrees of crankshaft angle before the top dead center (19-200 bTDC) compared to traditional diesel oil (DO) injection timing (180 bTDC), soot emissions are low (decrease 4.57-6.14%), power is high (increase 2.05-2.69%), and specific fuel consumption is reduced 5.14-6.25% compared to when not adjusted.