Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Patent
1983-03-24
1985-10-15
Martin, Jr., William D.
Geometrical instruments
Indicator of direction of force traversing natural media
Magnetic field responsive
33361, 364559, G01C 1728
Patent
active
045465517
ABSTRACT:
The system of the present invention provides an electrical digital compass for use in a vehicle which includes a unique compensation and variation correction control which is readily set by the vehicle operator with the operation of push-button switches. The electrical display system and circuitry includes a microprocessor for comparing the information from a magnetic field sensor when the vehicle is aligned in a magnetically known direction and for providing a correction signal to assure the displayed output corresponds to the predetermined magnetic field alignment. In areas where magnetic variation is significant, the system generates, stores and processes a correction signal to assure the displayed output corresponds to the true heading of the vehicle. In one embodiment of the invention, a temperature sensor is provided to indicate the ambient temperature in which the vehicle is operating and which is digitally displayed to the operator.
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Magnetic Field Sensor and Its Application to Automobiles, by Hisatsugu Itoh, 1980 SAE paper, SAE/SP-80/458.
Martin, Jr. William D.
Prince Corporation
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