| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently enhance the squish while ensuring an internal EGR to attain a higher compression ratio suppressed in knocking. SOLUTION: A valve recess 9 is eliminated in order to enhance the squish to zero the opening quantities of an intake valve 1 and an exhaust valve 3 in the top dead center, the intake valve 1 is opened after the top dead center, and the exhaust valve 3 and the intake valve 1 are opened before the top dead center. Otherwise, the valve recess 9 is eliminated in order to enhance the squish to zero the opening quantity of the intake valve 1 and exhaust valve 3 in the top dead center, the exhaust valve 3 is opened before the top dead center, and the intake valve 1 and the exhaust valve 3 are opened after the top dead center. Otherwise, the valve recess 9 is eliminated in order to enhance the squish to zero the opening quantity of the intake valve 1 and exhaust valve 3 in the top dead center, and the closing operation of the exhaust valve 3 is ended before a prescribed time from the top dead center.
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