Digital speedometer with index counter control of display

Details Digital speedometer with index counter control of display Digital speedometer with index counter control of display

1977-12-05

1979-04-24

Rolinec, Rudolph V.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324160, 235 92FQ, 324175, G01P 354

Patent

active

041514661

ABSTRACT:
A digital speedometer for indicating angular or linear velocity has an index counter to control update of the displayed velocity. The purpose of the index counter is to prevent undesirable fluctuation of the displayed velocity where minor variations in velocity being measured have occurred. The digital speedometer uses a pulsating input signal having a frequency proportional to the velocity to be indicated. An oscillator circuit provides a clock frequency that is utilized in generating a counting period electrical signal. During the counting period, the input pulses proportional to velocity are gated into a counter. After each counting period, a comparison is made between the count currently being displayed and the count stored in the counter. If a difference occurs, the index counter is incremented. Only after the index counter has been incremented a plurality of consecutive times is the display permitted to be updated.

REFERENCES:
patent: 3735387 (1973-05-01), Miller
patent: 3796583 (1973-10-01), Spencer et al.
patent: 3835382 (1974-09-01), Weisbart
patent: 3909716 (1975-09-01), Diekers

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