Jet propulsion boat
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsMamoru Uraki, Takao Kochi, Tomoya Kono, Hajime Shogase
Life of this patent
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Abstract
A controller that executes engine output control that a throttle is closed when a boat is navigated at a predetermined speed or higher and the output of an engine is gradually increased up to predetermined output when a steering system is steered right or left at a predetermined angle or more is provided. Thus, an overshoot phenomenon that the engine speed is held at a predetermined engine speed after the engine speed once increases up to the predetermined engine speed or higher when the engine speed is increased in deceleration can be avoided. As a result, the body of the boat can be prevented from sliding laterally to a great extent at the beginning of turning and the turning performance of the body can be enhanced.
Claims20
A jet propulsion boat wherein an impeller is turned by an engine as a driving source, a jet stream is generated by the impeller, the boat is advanced by jetting the jet stream via a nozzle and the direction of the nozzle is changed by a steering system when the boat is turned right or left, comprising:
- a controller for executing engine output control when a throttle is closed in navigation at a predetermined speed or higher for gradually increasing the output of the engine up to a predetermined output when a steering handlebar is steered right or left at a predetermined angle or more,
- wherein the controller for executing the engine output control incrementally increases a crank angle of an ignition timing at a first rate during a first time period, and then incrementally increases the crank angle of the ignition timing at a second rate at for at least second time period, the second rate of increase of the crank angle being greater than the first rate of increase of the crank angle.
A propulsion control system for use with a jet propulsion boat having an impeller for generating a jet stream wherein the boat is advanced by jetting the jet stream via a nozzle and the direction of the nozzle is changed by a steering system when the boat is turned right or left, comprising:
- a controller for executing engine output control when a throttle is closed during navigation at a predetermined speed or higher for gradually increasing the output of an engine up to a predetermined output when a steering handlebar is steered right or left at a predetermined angle or more,
- wherein the controller for executing the engine output control incrementally increases a crank angle of an ignition timing at a first rate during a first time period, and then incrementally increases the crank angle of the ignition timing at a second rate at for at least second time period, the second rate of increase of the crank angle being greater than the first rate of increase of the crank angle.
Dependencies are inferred from the claim text.