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The authors have studied the influence of common rail system on the injection characteristics and engine performance for reducing exhaust emissions and noise at low load of high-speed diesel engine.The effects of the parameters of injection timing, common rail pressure, pre-injection timing, pre-injection quantity and its interval etc. on especially the engine performance and noise at low load have been examined.As it is able to increase the fuel injection pressure at low speed, Bosch smoke number at low speed with torque rich operation was reduced by optimizing the injection pressure. And fuel consumption was reduced. In addition, NOx and PM were decreased by optimizing the injection timing for the engine operation condition. The pre-injection at idle and low load operation is one of the effective methods for reducing the noise.In this paper, the above test and analyses results are presented.

Improvement of the Low Load Performance of High-speed Diesel Engine by Common Rail System