| 摘要 |
PROBLEM TO BE SOLVED: To stably generate spontaneous ignition near the top dead center in an internal combustion engine using compression spontaneous ignition combustion of a combustible mixture. SOLUTION: At least in an initial stage of a compression stroke, the air and combusted gas in the cylinder constitute a state having a concentration distribution, and a strong turbulence is generated in the cylinder inside near the compression top dead center so that the agitation of the gas is accelerated to reduce the concentration distribution between the air and combusted gas in the cylinder. A squish part, which has an effect of the gas jetting in a part of a small interval toward the part of a wide interval in a compression stroke where the interval between a piston and the cylinder head is uneven in the top dead center, and the air flowing in a part of the wide interval into the part of the narrow interval in the expansion stroke, is arranged for generating the strong turbulence. The area of the squish part is set to not less than 25% and not more than 75% of the cylinder bore area and the interval of the squish in the top dead center is set to 3 mm or less.
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