Effects of Fuel Injection Parameters on the Morphological Characteristics of Soot Particulates and Exhaust Emissions from a Light-Duty Diesel Engine

Abstract

The aim of this paper is to investigate the effects of injection parameters and the exhaust gas recirculation (EGR) rate on the morphological characteristics of soot particulates and exhaust emissions in a common-rail direct-injection (DI) diesel engine with a piston displacement of 1.58 L. To investigate the influences of injection parameters and the EGR rate on the particulate morphology and exhaust emission characteristics, several different injection parameters and two EGR rates were investigated. The particulate morphology (including primary particles), the size of the soot agglomerates, the number of agglomerates, and the fractal dimension were also investigated under various injection strategies, pilot injection quantities, and percentage of EGR. The dependence of air pollution components in engine emissions, such as soot, nitrogen oxide (NOx), carbon monoxide (CO), and hydrocarbon (HC), upon pilot injection parameters and percentage of EGR at constant operating conditions was measured. A thermopho...