Engine speed control system for outboard motor

Details Engine speed control system for outboard motor Engine speed control system for outboard motor

2007-07-31

2007-07-31

Sotelo, Jesus (Department: 3617)

Marine propulsion

Engine, motor, or transmission control means

For engine speed

C440S084000

Reexamination Certificate

active

11218452

ABSTRACT:
In an engine speed control system for an outboard motor, overrev prevention control is implemented which determines whether the engine overrevs by comparing the detected engine speed and a desired speed and responds to a determination that the engine overrevs (in which case the cause of the engine speed increase is probably reduced load caused by sucking in of air and/or exhaust gas by the propeller) by driving an electric throttle motor in the direction of reducing the throttle opening, thereby lowering the engine speed to the desired speed. Owing to this configuration, the problem of decline in thrust owing to intake of air and/or exhaust gas by the propeller can be quickly overcome irrespective of operator skill, thereby improving power performance and steerability.

REFERENCES:
patent: 4594916 (1986-06-01), Ito et al.
patent: 4817466 (1989-04-01), Kawamura et al.
patent: 6364726 (2002-04-01), Motose et al.
patent: 2000-328996 (2000-11-01), None

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