Uniflow-scavenging-type two-cycle engine

A uniflow-scavenging-type two-cycle engine, comprising:

• a cylinder in which a combustion chamber is formed;
• a piston that slides in the cylinder;
• an exhaust port that is provided at a first end of the cylinder in a stroke direction of the piston;
• an exhaust valve that opens and closes the exhaust port;
• a scavenging port that is provided in an inner circumferential surface of a second end of the cylinder in the stroke direction of the piston and inhales an active gas into the combustion chamber in accordance with a sliding movement of the piston;
• a plurality of fuel injection valves, wherein each fuel injection valve includes an injection outlet provided between a top dead center and a bottom dead center of the piston in the cylinder, and the plurality of fuel injection valves inject a fuel gas to the active gas, which has been drawn in from the scavenging port to the combustion chamber, via the injection outlets, to thereby generate a premixed gas;
• a fuel injection control unit that varies injection directions of fuel gas injected from a part or all of the fuel injection valves;
• and
• a load determination unit that determines whether the uniflow-scavenging-type two-cycle engine is in a high-load state or in a low-load state,
• wherein if a load state detected by the load determination unit is the high-load state, then the fuel injection control unit turns the injection directions of the fuel gas to first directions, which are directions along a swirl flow of the active gas drawn in into the cylinder;
• and if a load state detected by the load determination unit is the low-load state, then the fuel injection control unit turns the injection directions of the fuel gas to second directions, which are directions closer to a central axis of the cylinder than the first directions.