Jet-propulsive watercraft
US6551152B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2001 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | Jun 8, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/501
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The present invention provides a lightweight and simply-configured watercraft of a jet-propulsive type that can maintain steering capability in a way adapted to forward movement and rearward movement of the watercraft even when throttle-close operation is performed and the amount of water ejected from a water jet pump is thereby reduced. During forward movement, when the throttle-close operation and steering operation of a steering handle are detected and an engine speed is between an idling speed and a predetermined engine speed, the engine speed is temporarily increased. During rearward movement, when the engine speed is the idling speed, the engine speed is temporarily increased in the same way. The engine speed is increased by changing a fuel injection timing of a fuel injection system, a fuel injection amount, and/or an ignition timing of an ignition system of the engine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.