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Diesel engines continue to offer outstanding benefits in fuel consumption and durability over other engine types. Recently however, the environmental impact of diesel engines has become an increasingly critical factor and has a significant influence on diesel engine development trends. The fuel injection system is one of the most important keys to fulfill the stringent exhaust emissions standards while still maintaining the fuel economy and related CO2 emission benefits of the diesel engine. Research has shown that, to a significant extent, by using the technique of fuel preinjection, DI diesel engines can simultaneously reduce NOx levels and particulate emissions while also improving the level of combustion noise. In addition, the technique has demonstrated the possibility to address these environmentally-focused goals while maintaining low fuel consumption, a characteristic strength of diesel engines, which is directly related to the reductions in CO2 emissions.