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Homogeneous charge compression ignition (HCCI) combustion enables higher thermal efficiency and lower NOx emission to be achieved in internal combustion engines compared with conventional combustion systems. Adjusting the proportion oftwo fuels with different ignition properties is an effective technique for controlling ignition timing in HCCI combustion. The authors have proposed a new HCCI combustion engine system fueled with dimethyl ether (DME) with a high cetane number and methanol-reformed gas (MRG) with a low cetane number in previous research. In the system, both DME and MRG are to be produced from methanol by onboard reformers utilizing exhaust heat from the engine. The research has shown high thermal efficiency of the system over a wide operable range of equivalence ratio. MRG effectively controls the timing of the second stage heat release by the high temperature reactions in HCCI of DME to expand operable range of equivalence ratio and engine load.

Homogeneous charge compression ignition (HCCI) combustion enables higher thermal efficiency and lower NOx emission to be achieved in internal combustion engines compared with conventional combustion systems. Adjusting the proportion of high cetane number fuel and high octane number fuel is an effective technique for controlling ignition timing in HCCI combustion. The authors have proposed a new homogeneous charge compression ignition combustion engine system fueled with dimethyl ether (DME) with high cetane number and methanol-reformed gas (MRG) with high octane number in previous research. In the system, both DME and MRG are to be produced from methanol by onboard reformers utilizing exhaust heat from the engine. The research has shown high thermal efficiency of the system over a wide operable range of equivalence ratio.