| 摘要 |
A fuel injection valve has a sac chamber filled with high-pressure gaseous fuel, an injection hole communicated with the sac chamber, and a nozzle needle that slidably moves to allow and interrupt a supply of the high-pressure gaseous fuel into the sac chamber. The fuel injection valve performs an injection of the high-pressure gaseous fuel directly into a combustion chamber of the internal combustion engine in accordance with a movement of the nozzle needle. The injection hole has an outlet portion with a divergently formed inner surface as coming toward an outlet end of the injection hole. The driving portion controls the movement of the nozzle needle to change a sac chamber pressure of the high-pressure gaseous fuel in the sac chamber so as to switch a jet flow speed of the high-pressure gaseous fuel injected through the injection hole between a subsonic speed and a supersonic speed. |
