| 摘要 |
PROBLEM TO BE SOLVED: To provide a direct injection type spark-ignition internal combustion engine which can realize more favorable stratification combustion by surely changing fuel injected into a cylinder from a fuel injection valve into preferable combustible gas mixture while the fuel is flying and by igniting to burn the combustible gas mixture by an ignition plug. SOLUTION: The direct injection type spark-ignition internal combustion engine includes: the fuel injection valve 1 for directly injecting fuel into the cylinder; the ignition plug 2 having an ignition gap positioned in a flying path of the fuel F injected from the fuel injection valve; and a cavity 3 formed in a top surface of a piston. When performing the stratification combustion, the fuel injection valve injects substantially all the fuel in such a direction that the fuel flows into a tumble flow T longitudinally whirling along the cavity in the compression stroke along the whirling direction of the tumble flow, and the ignition plug ignites the fuel at the end stage of injection while it is passing through the ignition gap. COPYRIGHT: (C)2007,JPO&INPIT
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