Modeling Cycleto-Cycle Coupling in HCCI Engines Utilizing Variable Valve Actuation

Abstract: In order to capture the effect of cycle-to-cycle coupling that is inherent in residual-affected homogeneous charge compression ignition (HCCI) engines, a simple, control-oriented, single-zone model of HCCI combustion is presented. The inclusion of an exhaust manifold model ties the exhausted gas from one cycle to that re-inducted on the next cycle. Multi-cycle simulations are completed and shown to have the same general steady state and transient characteristics as an experimental system. Predicted combustion phasing and in-cylinder pressure values agree very well with experiment. Copyright c 2004 IFA