| 摘要 |
PROBLEM TO BE SOLVED: To improve thermal efficiency by decreasing the amount of blow-by fuel gas. SOLUTION: A solenoid valve 4 of a gas feeding pipe 5 is opened during a period since an intake valve 2 starts to open until a crank angle becomes 360 degrees, and closed to stop feeding of fuel gas when the fuel gas amount determined by governing at that time is fed from a jet port 5a of the gas feeding pipe 5 into an inlet port 1. Since the jet port 5a is close to a combustion chamber, residual fuel gas in the inlet port 1 is decreased, so that the amount of blow-by fuel gas during overlapping period of a valve of this and the next cycle is decreased.
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