Fault detection circuit for sensors
US6313741A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1994 |
| Grant date | Nov 6, 2001 |
| Priority date | — |
| Expiry date | Dec 22, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T2270/416
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The present invention provides a sensor-fault detection circuit for use with either an inductive or capacitive-type sensor. The sensor-fault detection circuit conducts a test signal into the sensor circuit for testing such sensor circuit. A time difference measuring device is provided to analyze for correct duration of the transit time of a test signal or test pulse, respectively, passing through the sensor. In the event that the transit time does not fall within a predetermined range tolerance, a fault indication can be activated. The circuit can be used, for example, to test an inductive bar-type sensor to determine the speed of a wheel on a vehicle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.