Ships – Steering mechanism – Remote control steering excluding manual operation
Patent
1975-06-23
1976-03-30
Blix, Trygve M.
Ships
Steering mechanism
Remote control steering excluding manual operation
2351502, 244 77E, 318588, 318647, B63H 2502
Patent
active
039466914
ABSTRACT:
An improved marine compass employs a Hall-effect device which provides an output signal related to the relative rotation of the compass card therein. When the Hall-effect device is mounted on a course dial whose position with respect to the compass' lubber line indicates a desired course, the output signal may be used as an input to an autopilot system. The system includes a DC constant current supply for the Hall-effect device, and an integrated circuit operational amplifier for amplifying said output signal to provide an angle signal having a usable level. A differentiator including a second IC operational amplifier provides a rate signal from the angle signal. A rudder signal is provided by a rudder position sensor employing a second Hall-effect device and a third IC operational amplifier. The angle and rate signals are combined and supplied with the rudder signal to a variable-threshold differential amplifier which in turn provides a control signal to a steering servomotor to modify the rudder position so as to return the vessel to its desired course. To allow high rates of rudder positioning without overshoot, a null damper circuit varies the threshold of the differential amplifier to pulse modulate the control signal at small values thereof. By replacing the marine compass with a manual control employing a Hall-effect device, the system operates as a remote steering system.
REFERENCES:
patent: 2870979 (1959-01-01), Tribken et al.
patent: 3140436 (1964-07-01), Hatch
patent: 3199630 (1965-08-01), Engel et al.
patent: 3280781 (1966-10-01), Koerner
patent: 3425648 (1969-02-01), Wipff et al.
patent: 3622898 (1971-11-01), Salmon
patent: 3657629 (1972-04-01), Lloyd
patent: 3696282 (1972-10-01), Hirokawa et al.
Blix Trygve M.
Kunin Stephen G.
Metal Marine Pilot, Inc.
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