US 9,810,142 B2
Uniflow-scavenging-type two-cycle engine
Yutaka Masuda, Tokyo (JP); Takayuki Yamada, Tokyo (JP); Takayuki Hirose, Tokyo (JP); Takahiro Kuge, Tokyo (JP); and Takeshi Yamada, Tokyo (JP)
Assigned to IHI CORPORATION, Tokyo (JP)
Filed by IHI Corporation, Tokyo (JP)
Filed on Feb. 27, 2015, as Appl. No. 14/634,113.
Application 14/634,113 is a continuation of application No. PCT/JP2013/073188, filed on Aug. 29, 2013.
Claims priority of application No. 2012-191120 (JP), filed on Aug. 31, 2012.
Prior Publication US 2015/0176475 A1, Jun. 25, 2015
Int. Cl. F02B 25/00 (2006.01); F02B 25/02 (2006.01); F02D 41/30 (2006.01); F02B 25/04 (2006.01); F02M 21/02 (2006.01); F02B 7/08 (2006.01); F02D 41/32 (2006.01); F02D 41/34 (2006.01); F02D 41/00 (2006.01); F02D 19/10 (2006.01); F02D 41/38 (2006.01); F02B 75/02 (2006.01)
CPC F02B 25/02 (2013.01) [F02B 7/08 (2013.01); F02B 25/04 (2013.01); F02D 19/10 (2013.01); F02D 41/0027 (2013.01); F02D 41/3094 (2013.01); F02D 41/32 (2013.01); F02D 41/34 (2013.01); F02M 21/0275 (2013.01); F02M 21/0281 (2013.01); F02M 21/0284 (2013.01); F02B 2075/025 (2013.01); F02D 2041/389 (2013.01); F02D 2250/08 (2013.01); F02D 2400/04 (2013.01); Y02T 10/32 (2013.01); Y02T 10/36 (2013.01); Y02T 10/44 (2013.01)] 4 Claims
OG exemplary drawing
 
1. 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.