Method and circuit for checking the width of the air gap in a speed sensor
US6181127A · kind A · utility
9Cited by
2References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 4, 1999 |
| Grant date | Jan 30, 2001 |
| Priority date | — |
| Expiry date | May 4, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P1/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In the case of a method for checking the width of the measuring air gap of a magnetic speed sensor, square-wave output signals are generated from the measurement signals of the sensor by means of at least one prescribable threshold value. The pulse duty factor of the output signals is held within a prescribed range in the case of an acceptable gap width. In the case of amplitudes of the measurement signal outside prescribed limits, the pulse duty factor deviates in a reliably measurable fashion from the prescribed range. A circuit has the means for carrying out this method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.