Control apparatus for an outboard marine engine

Details Control apparatus for an outboard marine engine Control apparatus for an outboard marine engine

1992-04-21

1993-03-02

Basinger, Sherman

Marine propulsion

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

416 25, B63H 118

Patent

active

051904870

ABSTRACT:
An outboard marine engine capable of preventing the generation of cavitation around a propulsion screw due to an abrupt increase in the rotational speed thereof for improved acceleration performance. To this end, a rotational speed sensor senses the number of revolutions per minute of the engine, and a bubble sensor senses the amount of bubbles generated around the propulsion screw and generates a corresponding bubble signal. A controller generates, based on the output signals of the sensors, a drive signal for controlling engine operating parameters. The controller includes a speed limiter for determining, based on the bubble signal from the bubble sensor, whether the amount of bubbles generated around the screw is equal to or greater than a predetermined value. An actuator is driven by the drive signal to control the engine operating parameters in a manner to limit the number of revolutions per minute of the engine when the speed limiter determines that the amount of bubbles is equal to or greater than the predetermined value.

REFERENCES:
patent: 3314391 (1967-04-01), Duport
patent: 4861291 (1989-08-01), Koike

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