Apparatus for measuring the speed of an object with circuit for converting analog signals into logic signals and circuit for varying sensitivity
US4902970A · kind A · utility
33Cited by
6References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 17, 1988 |
| Grant date | Feb 20, 1990 |
| Priority date | — |
| Expiry date | Feb 17, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P21/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The circuit comprises a comparator 1 fed by a quasi-sinusoidal signal delivered by a source 2 for converting the positive alternations of the signal into pulses acceptable by digital computing means. According to the invention, the circuit comprises a current source 7 selectively connectible to the circuit in order to vary its sensitivity and to thus enable an evaluation of the amplitude of the signal delivered by the source 2. Application to the diagnosis of the operating state of a variable reluctance sensor delivering a quasi-sinusoidal signal representing the speed of rotation of a shaft fitted in a motor vehicle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.