| 摘要 |
PROBLEM TO BE SOLVED: To restrain the rate of increase in the pressure inside a cylinder and expanding of a compression autoignition combustion region toward the higher loaded side, by delaying the ignition time period at compression autoignition combustion time. SOLUTION: A first cavity 41 is formed at the center of the upper surface of a piston, a second annular shape cavity 42 is formed in the periphery of the first one, and a fuel injection valve 10 is so situated in the center of a cylinder head 5, that the cylinder axis coincides with the injection direction. With two fuel injections along with one one prior to the latter half of the compression travel to near the top dead center vicinity, and with the other is before it, an enriched gas 17 is located in the first cavity 41, and a lean mixture 18 is arranged in the second cavity 42. The enriched mixture 17 is made to ignite by spark ignition, after the top dead center, and by with the heat caused by the ignition the lean mixture 18 to is led to ignite automatically under compression.
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