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In resent years,lower noise has been in high demand in small diesel engines for agricultural and industrial uses as well as automotive engines. Furthermore,emission regulations becomes more severer due to environmental concerns. In order to satisfy these objects,diesel engine combustion needs to be improved. Especially fuel injection system is the key element to control engine combustion and should be improved dramatically. This research is to pursue the ideal fuel injection system to realize optimized diesel engine combustion which creates low combustion noise and clean exhaust emission. Recent progress will be reported in fuel injection technology including injection pressure pattern, injection rate pattern, injection timing and spray pattern, etc.

A large number of problems for which solutions must be found have come to the surface recently in regards to heavy duty diesel engines. These begin with the strict emission regulations, and also include the questions of improved fuel econoray, better engine output and lower noise levels. One indispensable element in the solution to these problems is an improvement in engine combustion, a factor which must include modifications in the fuel injection system. Another critical question is that of improving engine and vehicle control technology. The improvement of fuel injection performance-which must include control performance as well-is hence extremely important to the purification of diesel engine emissions, and research in this area roust progress at ever increasing rates.