公开(公告)号：US11131254B2

公开(公告)日：2021-09-28

申请号：US16894749

申请日：2020-06-05

申请人： IHI CORPORATION

发明人： Yutaka Masuda ,  Yoshiyuki Umemoto ,  Toshihiko Shimizu ,  Takahiro Takimoto

IPC分类号： F02D15/00 ,  B63H21/21 ,  F02B61/04 ,  F02B75/04 ,  F02D41/00

摘要： Provided is a marine engine, including: a piston; and a compression ratio controller configured to execute lowering processing of moving a top dead center position of the piston toward a bottom dead center side when an engine rotation speed falls within a resonance occurrence range set in advance. A geometrical compression ratio is reduced, and a resonance stress caused by a torsional vibration in a rotary system can thus be suppressed while suppressing a decrease in thermal efficiency compared with a case in which retarding control is applied to a fuel injection timing or a closing timing of an exhaust valve.

公开(公告)号：US20200300183A1

公开(公告)日：2020-09-24

申请号：US16894749

申请日：2020-06-05

申请人： IHI CORPORATION

发明人： Yutaka MASUDA ,  Yoshiyuki Umemoto ,  Toshihiko Shimizu ,  Takahiro Takimoto

IPC分类号： F02D15/00 ,  B63H21/21 ,  F02B61/04 ,  F02B75/04 ,  F02D41/00

摘要： Provided is a marine engine, including: a piston; and a compression ratio controller configured to execute lowering processing of moving a top dead center position of the piston toward a bottom dead center side when an engine rotation speed falls within a resonance occurrence range set in advance. A geometrical compression ratio is reduced, and a resonance stress caused by a torsional vibration in a rotary system can thus be suppressed while suppressing a decrease in thermal efficiency compared with a case in which retarding control is applied to a fuel injection timing or a closing timing of an exhaust valve.

公开(公告)号：US11105281B2

公开(公告)日：2021-08-31

申请号：US17021357

申请日：2020-09-15

申请人： IHI CORPORATION

发明人： Yutaka Masuda ,  Yoshiyuki Umemoto ,  Toshihiko Shimizu

IPC分类号： F02D15/02 ,  F02D41/00 ,  B63H21/38 ,  F02D13/02 ,  F02D41/38

摘要： Provided is a marine engine, including: an air controller configured to supply compressed air to a combustion chamber in an upstroke of a piston after a crash astern signal is output; a fuel controller configured to stop supply of fuel to the combustion chamber when the crash astern signal is output, and to resume the supply of the fuel after a backward rotation of a crankshaft; and a compression ratio controller configured to move a top dead center position of the piston toward an opposite side of a bottom dead center position of the piston when the crash astern signal is output, and the top dead center position of the piston is on the bottom dead center position side with respect to a predetermined position set in advance.