Some previous research results have shown that EGR (exhaust gas recirculation) rate, pilot fuel quantity, and main injection timing\nclosely associated with engine emissions and fuel consumption. In order to understand the combined effect of EGR rate, pilot fuel\nquantity, and main injection timing on the NO???? (oxides of nitrogen), soot, and ISFC (indicated specific fuel consumption), in this\nstudy, CFD (computational fluid dynamics) simulation together with the Taguchi method and the ANOVA (analysis of variance)\ntechnique was applied as an effective research tool. At first, simulation model on combustion and emissions of a light duty diesel\nengine at original baseline condition was developed and the model was validated by test. At last, a confirmation experiment with\nthe best combination of factors and levels was implemented. The study results indicated that EGR is the most influencing factor\non NO????. In case of soot emission and ISFC, the greatest influence parameter is main injection timing. For all objectives, pilot fuel\nquantity is an insignificant factor. Furthermore, the engine with optimized combination reduces by at least 70% for NO????, 20% in\nsoot formation, and 1% for ISFC, in contrast to original baseline engine.
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