Reduced-order modeling for studying and controlling misfire in four-stroke HCCI engines

It is well-known that an HCCI-based engine has a high operating efficiency and low emissions. However, the HCCI process is sensitive to disturbances that can cause the engine to misfire, especially at low loads. In this paper, we propose an efficient, physics-based model for studying engine state evolution in the presence of misfires. The model relies on a simple recursive mass balance model, simplified thermodynamic mechanisms, and use of the ¿integrated Arrhenius rate¿ with a modified threshold to model combustion phasing, occurrence of misfire, and partial burn during misfire. Simulation results for our reduced-order model, compared to a high-resolution HCCI simulation proposed in a previous work, show good match.