B - Operations – Transporting – 63 – H
Patent
B - Operations, Transporting
63
H
341/97
B63H 25/42 (2006.01) G05D 1/02 (2006.01)
Patent
CA 1215445
ABSTRACT OF THE DISCLOSURE There is provided a system for controlling the rotation of a propeller unit of a Z-type propulsion apparatus in which the propeller unit does not rotate in the direction opposite to that of rotation of a steering handle even when the steering handle for commanding the propeller unit to rotate is angularly moved by more than +180°. A vector calculation circuit either produces a sinusoidal signal representative of a sine of the difference of angle between the steering angle of the steering handle and the follow-up angle of the propeller unit and a cosine signal representative of a cosine of the difference of angle or produces the sinusoidal and cosine signals and a second sinusoidal signal representative of an angle obtained by adding 45° to the difference of angle. And a signal processing circuit produces, in accordance with either the first and second sinusoidal signals and cosine signal or the first sinusoidal and cosine signals, a signal whose polarity is not reversed even when the steering angle exceeds +180°. The signal produced by the signal processing circuit is supplied to a drive unit for rotating the propeller unit to thereby control the rotation of the propeller unit. -37-
455079
Aizawa Yasuo
Ichijo Kohji
Kodera Masanori
Niigata Engineering Co. Ltd.
Ridout & Maybee Llp
LandOfFree
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