Jet-propulsive watercraft and cruising speed calculating device for watercraft
US6568968B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 2, 2001 |
| Grant date | May 27, 2003 |
| Priority date | — |
| Expiry date | Aug 2, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63H11/107
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
The present invention provides a lightweight and simply-configured watercraft of a jet-propulsion type, which can maintain steering capability according to a cruising speed of the watercraft even while a throttle-close operation is performed and the amount of water ejected from a water jet pump is thereby reduced, and a cruising speed calculating device suitable for the watercraft. During forward movement, when the throttle-close operation and steering operation of a steering handle are detected and a cruising speed is within a predetermined speed range, the engine speed is increased. 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. The cruising speed is calculated from the engine speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.