Revolution speed detecting apparatus for extracting signal corresponding to revolution speed
US6384594B1 · kind B1 · utility
4Cited by
9References
4Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jul 26, 2000 |
| Grant date | May 7, 2002 |
| Priority date | — |
| Expiry date | Jul 26, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/49
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Through differentiation of input signal Vw from a sensor the angular frequency &ohgr; becomes included in the amplitude component. Through a plurality of differential operations the amplitude including the angular frequency &ohgr; varies, but the time-dependent term becomes equal. Since the amplitude of the signal Vw outputted from the revolution speed sensor 10 is approximately constant, the angular frequency &ohgr; proportional to the revolution speed can be extracted by determining a ratio thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.