Comparing to the air-path loop control, the fuel injection on Diesel engines is a fast control actuator in the realization of advanced combustion modes and the smooth transitions during combustion mode switchings. In this paper, given the estimated in-cylinder conditions (ICCs) at the crank angle of intake valve closing (IVC), models describing the relationship between the fuel injection split ratio and the combustion performance indices, such as CA50 and IMEP, are proposed and validated through experimental data obtained on a medium-duty Diesel engine. Such models can be potentially instrumental in systematic and cooperative control of air-path and fuel-path in the Diesel engine advanced combustion modes and the transient operations during combustion mode switching processes.

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