To improve fuel consumption by eliminating a pump loss by stratified combustion under partial loading, and to increase output by premixed combustion at the time of the maximum output.
An ignition source 14 is provided near a fuel injection valve 13 at the time of partial loading. Mixture is ignited after injecting fuel, and a generated flame is diffused in a cylinder by spraying the fuel, thereby carrying out stratified combustion. On the other hand, when a load is increased and soot and the like is generated by the stratified combustion, fuel injection is carried out several times, and premixture is generated by the injection in the first half, and the premixture is burned in a short time by injecting a flame generated by the injection in the last half into the cylinder. Combustion time is shortened, and knocking can be prevented. Furthermore, a compression rate of an engine is increased to raise thermal efficiency, and fuel consumption is improved. The generation of unburned hydrocarbon can be prevented by stratified suction. By cylinder injection of the fuel, reponsiveness of the fuel is enhanced to improve operability.
NOGI TOSHIJI
OYAMA TAKASHIGE
OSUGA MINORU
SHIRAISHI TAKUYA
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