| 摘要 |
PURPOSE:To improve combustion performance by achieving stratification by installing a fuel injection valve into one among two intake passages and opening a suction valve in the intake passage from the vicinity of the center of suction cycle to the beginning of compression cycle and properly controlling the fuel injection completion timing. CONSTITUTION:The first and the second intake passages 10 and 11 are formed into a cylinder head 4, and converged inside an intake branched pipe 14. The first intake passage 10 has the sectional area larger than that of the second intake passage 11, and is formed into helical form, and the second intake passage 11 is formed as straight port, and a fuel injection valve 5 is arranged onto the upper wall surface. The first intake valve 7 in the first intake passage 10 opened from the vicinity of the top dead center in suction cycle to the beginning of compression cycle, and the second suction valve 8 in the second intake passage 11 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 15 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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