The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 21, 1980
Filed:
Mar. 14, 1978
Aldo Bassi, Milan, IT;
Alfa Romeo S.p.A., Milan, IT;
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.