Digital speedometer

Details Digital speedometer Digital speedometer

1977-12-12

1979-07-24

Rolinec, Rudolph V.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324166, G01P 336, G01R 2500

Patent

active

041624459

ABSTRACT:
A digital speedometer is provided for use in an automotive vehicle and includes a transducer for connection to a conventional speedometer cable driver. The transducer is equipped with an optical encoder that produces electrical pulses in response to rotational motion of the speedometer cable driver. The electrical pulses are transmitted to a counting circuit which is reset by a variable reference oscillator. The frequency of the oscillator is much lower than the frequency of pulses from the transducer. Accordingly, a number of pulses from the transducer indicative of the speed of the vehicle are tabulated by the counting device during intervals between reset pulses from the reference oscillator. The period between reset pulses is determined by an adjustment to the oscillator to vary the output frequency thereof. The number of counts tabulated during each period is passed to a visual display.

REFERENCES:
patent: 3704445 (1972-11-01), Lanham
patent: 3729996 (1973-05-01), Metz
patent: 4031466 (1977-06-01), Krause et al.

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