| 摘要 |
PURPOSE:To improve combustion performance by installing a fuel injection valve into one among three intake passages and opening the suction valve in each intake passage at a specific timing and permitting stratification by properly controlling the fuel injection completion timing of the fuel injection valve. CONSTITUTION:The first and the second intake passages 12 and 13 having a relatively large sectional area and the third intake passage 4 which has a relatively small sectional area and is positioned between the both passages 12 and 13 are formed into a cylinder head 4, and the first-third suction valves 7-9 are installed into the passages 12-14, respectively. An intake control valve 19 which is opened in high load operation is installed into the second intake passage 13, and a fuel injection valve 21 is arranged onto the upper wall surface in the third intake passage 14. The first and the second suction valves 7 and 8 are opened from the vicinity of the top dead center in suction cycle to the beginning of compression cycle, and the third suction valve 9 is opened from the vicinity of the center in suction cycle to the beginning of compression cycle, and the injection completion time of the fuel injection valve 21 is controlled so as to gradually advance toward the beginning of suction cycle from the end of suction cycle, as the engine revolution speed increases.
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