Boat propulsion unit

Details Boat propulsion unit Boat propulsion unit

2008-09-03

2009-10-06

Avila, Stephen (Department: 3617)

Marine propulsion

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

C440S006000, C440S084000

Reexamination Certificate

active

07597597

ABSTRACT:
A boat propulsion unit includes an electric motor, a potentiometer arranged to detect the rotating angle of a throttle grip, a first stop mode sensor, a second stop mode sensor, and a controller including a CPU, and a disconnection and short detecting circuit. If the voltage signal fed by the disconnection and short detecting circuit is out of the specified range, the CPU detects the operation mode designated by the throttle grip based on the switching of the outputs from the first stop mode sensor and the second stop mode sensor. Then, the electric motor is driven in the forward operation mode and with the specified output power when the forward operation mode is designated, whereas, the electric motor is driven in the reverse operation mode and with the specified output power when the reverse operation mode is designated. Using this arrangement, the boat propulsion unit can obtain a minimum required boat operation as intended by the boat operator even when an abnormality has occurred in the controls.

REFERENCES:
patent: 5429092 (1995-07-01), Kamei
patent: 5899191 (1999-05-01), Rabbit et al.
patent: 6322405 (2001-11-01), Griffith et al.
patent: 3525478 (2004-05-01), None

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