US 12,258,919 B2
Marine propulsion device and marine vessel
Ryutaro Iwaki, Shizuoka (JP); Junsei Suzuki, Shizuoka (JP); Taichiro Nannichi, Shizuoka (JP); and Tomoyuki Kashiwayama, Shizuoka (JP)
Assigned to YAMAHA HATSUDOKI KABUSHIKI KAISHA, Shizuoka (JP)
Filed by YAMAHA HATSUDOKI KABUSHIKI KAISHA, Iwata (JP)
Filed on Apr. 17, 2023, as Appl. No. 18/301,566.
Claims priority of application No. 2022-068763 (JP), filed on Apr. 19, 2022.
Prior Publication US 2023/0332554 A1, Oct. 19, 2023
Int. Cl. F02D 41/14 (2006.01); B63H 21/21 (2006.01); F02B 75/18 (2006.01)
CPC F02D 41/1498 (2013.01) [B63H 21/21 (2013.01); F02B 75/18 (2013.01); B63H 2021/216 (2013.01); F02B 2075/1816 (2013.01); F02D 2200/101 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A marine propulsion device comprising:
an engine;
a rev-up detector to detect a sudden increase in an engine rotation speed; and
a controller configured or programmed to perform a control to suppress the engine rotation speed; wherein
the controller is configured or programmed to:
perform an initial misfire control to determine whether or not a cylinder of the engine is to be misfired in order to suppress the engine rotation speed when it is determined that an initial sudden increase in the engine rotation speed that causes over-revving has occurred based on a detection result from the rev-up detector, and to misfire the cylinder in the initial misfire control when it is determined that the cylinder is to be misfired; and
perform a subsequent misfire control to determine whether or not the cylinder is to be misfired in order to suppress the engine rotation speed when it is determined that a subsequent sudden increase in the engine rotation speed that causes the over-revving has occurred following the initial sudden increase in the engine rotation speed based on the detection result from the rev-up detector, and to misfire the cylinder in the subsequent misfire control when it is determined that the cylinder is to be misfired.