A study of DI diesel combustion under uniform higher-dispersed mixture formation

A new concept of combustion system is proposed for the simultaneous reduction of NOx and soot. The injection system is constructed with a new injector driven by a piezo-actuator and mechanical feed pump. The image of combustion was taken by shadow graph method, and an image intensifier was used to detect very weak photic signals in combustion. The level of NOx is about 1/100 that of a conventional Dl diesel engine or lean burn gasoline engine. The mechanism of extremely low NOx and the ignition mechanism are discussed. This system is named the uniform bulky combustion system (UNIBUS). Presently, UNIBUS is only effective under lower load.