Predictive Modeling of a Homogeneous Charge Compression Ignition (HCCI) Engine with EGR Fueled with Diesel

摘要

In this article, a predictive model of an engine running in homogeneous charge compression ignition (HCCI) combustion mode with diesel fuel is presented and validated with experimental results. The predictive model behaves as a transfer function with four independent input variables; engine speed, air mass flow, fuel consumption, and constant pressure specific heat. Combustion pressure and NO_x emissions are given as results. The model is based on several submodels that include intake flow characterization, the start of combustion from chemical kinetics, and a new heat release law applied in a unique volume. This new heat release rate for HCCI combustion mode allows reproducing combustion chamber pressure for any load condition, including EGR. The predictive model has been developed in a Matlab environment from 269 observations that cover the full operation range of the engine in HCCI combustion mode. Research is underway to estimate other relevant engine performance parameters, such as brake mean effective pressure, fuel consumption, or engine torque.