Abstract: Abstract: An engine cycle simulation model of 16V280ZJ diesel engine with an electronic injection system was established using the software GT-Power. The engine is the power unit of Chinese main railway diesel locomotives. A series of combustion cases of the heavy-duty direct injection (DI) diesel engine were calculated based on typical split injection modes. Simulation parameters are modified based on the comparison with given experimental results. Calculation results effectively demonstrated the effects of different injection velocity, fuel distribution and pulse interval on heat release rate. The injection optimization under multi-injection mode was proposed to lower the emissions and the pressure rise gradient. 

Key words: diesel engine, multi-injection, simulation, optimization