Abstract
Automobile industries have been developed rapidly mainly as a key manufacture. On the other hands, atmosphere is getting worse noticeably than in any other times. In the diesel emission, PM (Particulate Matter) and Nox (Nitrogen Oxidation) have been exhausted with a great amount and the regulation is getting stringent. In order to develop low emission engine, it is necessary to research on better quality of fuel. Sulfur contained in fuel is transformed to sulfur compound by DOC (Diesel Oxidation Catalyst) and then it causes to increase of sulfate-laden PM on the surface of catalyst. Recently diesel automobile industries are focused on the development of reduction techniques on PM by modifying combustion of sulfur in fuel. In this research, ULSD (Ultra Low Sulfur Diesel) was used as a fuel and some experimental results were investigated. ULSD can reduce not only PM but also gas materials because cetane value, flash point, distillation 90%, pour point and viscosity are improved in the process of desulfurization. However, excessively reduced sulfur may cause to decrease lubricity of fuel and engine performance in fuel injection system. Therefore, it requires only the modest adjusted amount of sulfur can improve engine performance and DOC, as well as decrease of emission.