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In a port fuel injection engine, Optimized kinetic process (OKP) technology   is implemented to realize HCCI combustion with dual-fuel injection. The   effects of intake air temperature on HCCI combustion and emissions are   investigated. The results show that dual-fuel control prolongs HCCI   combustion duration and improves combustion stability. Dual-fuel HCCI   combustion needs lower intake air temperature than gasoline HCCI combustion,   which reduces the requirements on heat management system. As intake air   temperature decreases, air charge increases and maximum pressure rising rate   decreases. When intake air temperature is about 55ºC, HCCI combustion becomes   worse and misfire happens. In fixed dual fuel content condition, HC and CO   emission decreases as intake air temperature increases. The combination of   dual-fuel injection and intake air temperature control can expand operation   range of HCCI combustion

Effects of intake air temperature on homogenous charge compression ignition combustion and emissions with gasoline and n-heptane