Fuel Injection System

Abstract--Clean air in atmosphere get polluted by industrialization around the world. The major cause of atmospheric air pollution are emissions from industries and automotive engines. Scientists all over the world are working on reducing the air pollution from these sources. One of the major contributor to the air pollution is emissions from diesel engines. There are many techniques available to reduce the diesel engine emissions and one of the techniques is using electronic fuel injection systems in diesel engines. In the current study, a water cooled diesel engine was usedwith common rail direct injection system to study the emissions from diesel engine. Experiments were conducted by varying the injection parameters such as fuel injection

This results in better fuel-air mixtures, improved combustion, and performance characteristics.Basic diesel mixture only produces so called basic experimental results which are not always the required result. Better blends helps brake thermal efficiency and reduces emissions of NOxand CO, CO2.The brake thermal efficiency is noted via experimentation using the test rig of Kirloskar single cylinder diesel engine, through this various parameters are seen during its run such as injection pressure, timing, efficiency, HRR etc [13-15] HRR and efficiency are directly related to injection timing at a given pressure. This article covers what are the merits and demerits of varying the injection pressure, timingand study the performance, combustion, emission of various

RESULTS AND DISCUSSION

A. Change in Injection Pressure

Injection pressure is changed from 300bar to 600bar initially.Increasing the injection pressure injects diesel quickly so that there will be more time for the fuel to mix with the compressed air, this will help the combustion through which emissions such as smoke, carbon monoxide will be decreased. Comparison of cylinder pressure-crank angle for various injection pressures are shown in Figure 2. From the graph its shown that when the injector pressure increases the cylinder pressure decreases this makes the injection of diesel complete. It gives to complete combustion.

Figure 2: Comparison of Cylinder Pressure and Crank Angle for Various Injection Pressure Figure 3:Comparison of HRR and Crank Angle for Various Injection Pressure

Comparison of HRR and crank angle for various injection pressure are shown in Figure 3. It shows that HRR decreases with increase in injection pressures. Figure4: Effect of Indicated Thermal Efficiency for Various Injection Pressure

ITE for various injection pressures are shown in Figure4. It is observed that ITE decreases after 400 bar. This states that fuel consumption at 400bar is less compared to other