Direct reading digital speedometer

Details Direct reading digital speedometer Direct reading digital speedometer

1975-01-09

1976-11-09

Segal, Robert

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

235 92FQ, 235 92TF, G01P 348, G01P 354

Patent

active

039913686

ABSTRACT:
A disk rotatably connected to an associated vehicle's speedometer cable has a plurality of holes evenly spaced around its circumference. The number of holes is a function of the number of revolutions the speedometer cable makes in a given distance traveled by the vehicle. The holes allow a beam of light to fall on a phototransistor. The phototransistor generates electrical pulses per unit time numerically proportional to the angular velocity of the disk and thus to the speed of the vehicle. The function relating the number of holes on the disk to the number of revolutions made by the speedometer cable per a given distance is chosen to make the number of pulses generated per a given time equal to or an integral multiple of the speed of the vehicle expressed in some standard system of speed measurement. Logic circuits divide the output pulses by said multiple and store the resulting number. This stored number is then directly displayed and is equal to the speed of the vehicle in terms of the standard system.

REFERENCES:
patent: 3578960 (1971-05-01), Georgi et al.
patent: 3614617 (1971-10-01), Blake, Jr.
patent: 3639753 (1972-02-01), Reich
patent: 3704445 (1972-11-01), Lanham
patent: 3786336 (1974-01-01), Lohr
patent: 3824385 (1974-07-01), Kiencke

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