Abstract
Exhaust gas recirculation (EGR) is more effective than selective catalytic reduction (SCR) or lean NOx trap (LNT) for the reduction of NOx emissions in diesel engines. A large amount of EGR gas is necessary to satisfy the stringent regulations on NOx emissions. Low pressure loop (LPL) EGR is almost independent of the variable geometry turbocharger (VGT) at a specific boost pressure, so LPL EGR is better than conventional high pressure loop (HPL) EGR in terms of EGR supply. We compare the influence of HPL EGR and LPL EGR on the combustion characteristics at a constant boost pressure in a diesel engine. The dilution ratio was employed as an independent parameter to analyze the effect of the dilution of the intake charge for each EGR loop. At the same level of NOx emissions, the fuel consumption and smoke opacity were slightly lower for LPL EGR than for HPL EGR.
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