G070034 A Study on Reduction of Emissions and Improvement in Fuel Economy for a Diesel Engine with a LPL-EGR System

Abstract

An experimental study was conducted to investigate the effect of LPL-EGR on combustion and exhaust emissions characteristics of a four cylinder DI diesel engine during steady state and transient operation. The engine is equipped with high-pressure loop (HPL) and low-pressure loop (LPL) EGR systems. The results show that the LPL-EGR system is more effective than the HPL-EGR system in terms of NOx and Soot reductions over a wide range of steady state lower load. However, fuel consumption tends to increase by using the HPL-EGR system at low load. It was found that although the boost change is stable, the EGR ratio response is slower at LPL-EGR.