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In this study, it made to run conventional single direct injection(DI) diesel engine, which adapted bulk combustion system not following spark ignition system without any ignition apparatus. It was heated and controlled inlet-air into conventional single DI diesel engine. The maximum value of brake thermal efficiency was at 35 region of air-fuel ratio. On the contrary, when the region of air-fuel ratio leaner than 35, brake thermal efficiency was decreased suddenly. And brake thermal efficiency was increased as much as inlet-air heating temperature increased. So, when air-fuel ratio was decreased and inlet-air heating temperature was higher, the engine was in optimal operation condition.Key Words : Diesel Engine, Gasoline Fuel, Compression Ignition *  : (jslee1@kyonggi.ac.kr) 10 10 25  (1 10 12 02, 2 10 12 16)  11 01 13 1.                        .                      [1-3].  CO2               .           [4].            bulk combustion       [5-11].Bulk combustion           -              "HCCI (Homogeneous Charge Compression Ignition)[5]", "PCCI(Premixed Charge Combustion Ignition) [6]", "ATAC(Active Thermo Atmosphere Combustion) [8]", "AIC(Auto-Ignition Compression)[9]"     .

Improvement of Compression Ignition for Gasoline Fuel Injected in the Diesel Engine