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Effects of Fuel Injection Timing on Performance Characteristics in Diesel Engine

A study on the combustion and exhaust emissions (Soot & NOx) of diesel engine with various fuel injection timing is performed experimentally. In this paper, fuel injection timing is changed from BTDC 20˚ to 14˚ at 2˚ intervals, the experiments are performed at engine speed 1800rpm and from load 25% to 100% at 25% intervals. and main measured parameters are cylinder pressure, rate of pressure rise, fuel consumption rate, Soot and NOx emissions etc. The obtained conclusions are as follows (1) Cylinder maximum pressure is increased with leading fuel injection timing. (2) Specific fuel consumption is indicated the least value at BTDC 18˚ of fuel injection timing. (3) Sact emission is decreased with leading fuel injection timing. (4) NOx emission is increased with leading fuel injection timing.