Velocity sensing system

Details Velocity sensing system Velocity sensing system

G - Physics

01

P

73/69, 340/148.7

G01P 3/48 (2006.01)

Patent

CA 1170745

Velocity Sensing System Abstract of the Disclosure A gear speed measuring system which is capable of measuring speeds down to zero, which is capable of use in a rugged environment, and which is relatively insensitive to gear-sensor spacing. The system comprises an electromagnetic sensor connected into the tank circuit of an oscillator to produce an FM signal in which the frequency shifts occur in synchronism with the rotation of a gear or the like. A detector having a reference frequency input converts the FM signal to a digital signal. A microprocessor adjusts the reference frequency as necessary to keep it between the high and low limits of the sensor output. The speed measuring system is applied to the control of the drive unit for a heavy off road vehicle such as a tractor or earth mover.

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