Effect of Hydrous Ethanol Combined with EGR on Performance of GDI Engine
In recent years, PM emission from GDI engines has been gradually paid attention to, while the hydrous ethanol has a high oxygen content and a fast burning rate, which can effectively improve the combustion environment. In addition, EGR can effectively reduce engine NOx emissions, and combining EGR technology with GDI engines is becoming a new research direction. In this paper, the effects of hydrous ethanol gasoline on the combustion and emission characteristics of direct injection engines are analyzed through direct injection engine bench test. The results show that the increase of the proportion of hydrous ethanol accelerates the combustion rate, shortens the combustion duration, and peaks the cylinder pressure and heat release rate. At the same time, the combustion efficiency is improved. The hydrous ethanol gasoline can effectively improve the gaseous and PM emissions of the direct injection engine.