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US 8,577,524 B2Granted
Watercraft propulsion device
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorTakuya Kado
Life of this patent
Estimating the term…
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.
Claims12
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;
- a rotational speed detector that detects an engine rotational speed;
- a controller programmed to execute a suppression control to suppress the engine rotational speed when the engine rotational speed is equal to or larger than a prescribed rotational speed;
- and
- a notifying device;
- wherein
- the notifying device issues a warning to an operator when a number of times the engine rotational speed has repeatedly exceeded the prescribed rotational speed is equal to or larger than a prescribed number of times.
6 more elements
Dependencies are inferred from the claim text.