Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1978-03-14
1980-10-21
Rolinec, Rudolph V.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
368118, G01P 348, G04F 1004
Patent
active
042296951
ABSTRACT:
A digital transducer for rotary shaft speed has a resolution which varies automatically with shaft speed. A wheel, keyed to the shaft, is partitioned into plural sectors by angularly spaced notches, the angular spacing between successive notches increasing in a fixed ratio to define respective preselected speed zone within a range of such zones. A first counter is arranged to count fixed frequency clock pulses and to be reset after each shaft revolution. A variable frequency pulse train is generated by a sensor arranged to sense the passage of each notch. Upon receipt of each pulse in the variable frequency pulse train, a comparator compares the count in the first counter with stored reference numbers which are related to the clock pulse frequency and to the ratio of successive angles between the notches. A second counter, also reset once during each shaft revolution, counts pulses in the variable frequency pulse train. When the comparator finds the first counter contents equal to a reference number, the contents of both counters are displayed as a function of shaft speed.
REFERENCES:
patent: 4093916 (1978-06-01), Summer
Alfa Romeo S.p.A.
Rolinec Rudolph V.
Snow Walter E.
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