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US 2013/0096743 A1Published application
Watercraft propulsion device
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorTakuya KADO
Life of this patent
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Abstract
A watercraft propulsion device includes an engine, a drive shaft, a propeller shaft, a rotational speed detector, and a controller. The drive shaft transmits power from the engine. The propeller shaft is rotationally driven by power transmitted from the drive shaft. The rotational speed detector detects an engine rotational speed. The controller executes a suppression control to suppress the engine rotational speed when a change rate of the engine rotational speed is equal to or larger than a prescribed value.
Claims18
A watercraft propulsion device comprising:
- an engine;
- a drive shaft that transmits power from the engine;
- a propeller shaft rotationally driven by power transmitted from the drive shaft;
- a rotational speed detector that detects an engine rotational speed;
- and
- a controller programmed to execute a suppression control to suppress the engine rotational speed when a change rate of the engine rotational speed is equal to or larger than a prescribed value.
3 more elements
A watercraft propulsion device comprising:
- an engine;
- a drive shaft that transmits power from the engine;
- a propeller shaft rotationally driven by power transmitted from the drive shaft;
- and
- a controller programmed to compute a first computed rotational speed of the engine based on a rotation time per prescribed first rotational angle and a second computed rotational speed of the engine based on a rotation time per second rotational angle that is smaller than the first rotational angle, and to execute a suppression control to suppress an engine rotational speed when the first computed rotational speed is equal to or larger than a prescribed first threshold value and execute the suppression control when the second computed rotational speed is equal to or larger than a prescribed second threshold value.
2 more elements
Dependencies are inferred from the claim text.