Modeling and Analysis of Fuel Injection Split for Diesel Engine Active Fueling Control

Abstract

With the improvements in Diesel engine injection systems, the fuelingpath, which is more accurate, flexible, and faster than the airpath, can be actively utilized in conventional and advanced combustion mode controls, especially for enhancing the combustion transient performance. In this paper, fuel injection split models are proposed to describe the relationship between fuel split ratio and two combustion outputs, i.e., the crank angle at 50% heat released (CA50) and the indicated mean effective pressure (IMEP). The model parameters are related to the engine incylinder thermal boundary conditions, referred to as the incylinder conditions (ICCs). The models were verified by engine experimental data with identical and different ICCs under different engine operating conditions. Such models can be potentially utilized in active fueling control for Diesel engine combustion control, and therefore benefit engine fuel efficiency and reduce engineout emissions.