Method of examining functionability of a wheel speed sensor
US5140260A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1991 |
| Grant date | Aug 18, 1992 |
| Priority date | — |
| Expiry date | Jan 14, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/44
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
For measuring the rotational speed of a wheel in an antilocking protected vehicle brake system a rotational speed sensor is provided in which in accordance with the rotational speed of the wheel signals are electromagnetically induced which have an amplitude and frequency which increase regularly with the rotational speed. When due to error sources the amplitude of the induced signal does not increase with the frequency of the signal a rotational speed measured value is determined by means of the measured amplitude, i.e. not on the basis of the measured frequency. To avoid erroneous measuring signals it may likewise be provided that when the amplitude of the signal does not increase with its frequency the last measured value of the frequency of the induced signal at which the amplitude still increased with the frequency is used to determine the speed of rotation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.