Speed and direction sensing circuit
US4331917A · kind A · utility
19Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1979 |
| Grant date | May 25, 1982 |
| Priority date | — |
| Expiry date | Dec 13, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P13/045
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A speed and direction detector for rotating bodies such as gears (10) including a pair of spaced sensors (14) mounted adjacent the gear teeth (12) to develop phase-shifted alternating signal waveforms, and a decoder (20) to develop a sequence of output signal conditions (S0-S3) depending upon the relation between the alternating waveform values. Signal stage memories (26, 28, 30, 32, 34, 36) utilizing flip-flops and gates connect the decoder outputs to an up/down counter (42, 44) which is incremented or decremented according to gear rotation direction only if a complete signal condition sequence occurs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.