Low-cost means for estimating and controlling speed of...

Details Low-cost means for estimating and controlling speed of... Low-cost means for estimating and controlling speed of...

2006-01-17

2006-01-17

Wright, Andrew D. (Department: 3617)

Marine propulsion

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

C440S006000

Reexamination Certificate

active

06986688

ABSTRACT:
A speed estimation system for watercraft comprising a propulsion unit configured to provide thrust via rotation of a propeller and having an electric motor, a power supply configured to supply electric power to the propulsion unit, and an electronic circuit configured to sense at least one propulsion system parameter from which the propeller torque can be at least implicitly determined, and at least one propulsion system parameter sensed from which the propeller speed can be at least implicitly determined, the electronic circuit configured to determine the watercraft speed based on the sensed parameters.

REFERENCES:
patent: 4854902 (1989-08-01), Havins
patent: 6276975 (2001-08-01), Knight
patent: 6659815 (2003-12-01), Motsenbocker

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