Mitsuo Hitomi

A study of the improvement effect of Miller-cycle on mean effective pressure limit for high-pressure supercharged gasoline engines

Abstract A theoretical adiabatic combustion cycle model of the Miller-cycle was made in order to study its effect on increasing mean effective pressure. The model can evaluate the maximum cylinder pressure, exhaust gas temperature and knocking tendency, which cause reliability problems in high-pressure supercharged gasoline engines. The theoretical calculations with this model and experiments with an actual engine show good coincidence and indicate the advantage of the Miller-cycle, such as higher mean effective pressure, than the Otto-cycle with lower nominal compression ratio while maintaining the same reliability conditions.