Propulsion unit for boat

Details Propulsion unit for boat Propulsion unit for boat

2007-01-30

2007-01-30

Avila, Stephen (Department: 3617)

Marine propulsion

Means to control the supply of energy responsive to a sensed...

Reexamination Certificate

active

11103402

ABSTRACT:
A propulsion unit can comprise a propeller and an internal combustion engine for driving the propeller. The propulsion unit can include a gear switching device for changing a drive mode of the propulsion unit between a forward drive mode, a reverse drive mode and a neutral mode. A throttle valve can be configured to control an opening of a first intake passage of the engine, and an idle speed control valve can be configured to control an opening of a second intake passage downstream of the first intake passage can also be provided. The propulsion unit can also comprise a control unit for controlling the idle speed control valve, wherein the control unit is configured to bring the engine to a first target rotational speed when the propeller is in the neutral mode, and to a second target rotational speed when the propeller is in the forward or reverse drive mode, wherein the first rotational speed is greater than the second rotational speed.

REFERENCES:
patent: 6102755 (2000-08-01), Hoshiba
patent: 2003/0013354 (2003-01-01), Yanagihara
patent: 2004/0121661 (2004-06-01), Okuyama
patent: 2001-152895 (2001-06-01), None

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