Vehicle road speed signal source

Details Vehicle road speed signal source Vehicle road speed signal source

G - Physics

01

P

340/148.5

G01P 3/42 (2006.01) B60K 31/04 (2006.01) G01P 3/48 (2006.01) G01P 3/487 (2006.01)

Patent

CA 1089554

TITLE OF THE INVENTION VEHICLE ROAD SPEED SIGNAL SOURCE ABSTRACT OF THE DISCLOSURE A vehicle road speed signal source including a speed sensor and a frequency to voltage converter for generating a pulsed output signal having an average magnitude proportional to the road speed of an associated vehicle. The speed sensor has a high energy product magnet attached to the drive shaft of the vehicle which induces current pulses in a proximately spaced pick-up coil. The pick-up coil is connected to a preamplifier having a low input impedance to reduce the effect of spurious signals such as ignition noise. The preamplifier output signal may be shaped into a square wave pulse train or may be applied directly to the frequency to voltage converter which generates a pulsed output signal having a duty cycle and therefore an average magnitude proportional to the vehicle road speed.

256074

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