Reluctance sensor having variable threshold detection circuit
US5446375A · kind A · utility
19Cited by
16References
5Claims
0Family size
Assignees
Inventor
Key dates
| Filing date | Oct 16, 1992 |
| Grant date | Aug 29, 1995 |
| Priority date | — |
| Expiry date | Oct 16, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/1532
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A reluctance sensor produces reluctance signals in response to passing slots in a rotating wheel. When a given signal exceeds a threshold, a DIG.sub.-- OUT signal is produced. When the signal falls to zero, the DIG.sub.-- OUT signal is terminated. The invention adjusts the threshold, based on the magnitude of the reluctance signals. Since the magnitude of the reluctance signals depends on wheel speed, the invention, in effect, adjusts the threshold based on wheel speed, yet without independently measuring wheel speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.