Position sensing device and method for implementing failsafe control on position sensing system including the same
US8487578B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 2011 |
| Grant date | Jul 16, 2013 |
| Priority date | — |
| Expiry date | Mar 16, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/145
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A movement detection unit detects a movement of a detected object and outputs a voltage signal to an electronic control unit. A buffer unit implements buffer amplification on the outputted voltage signal. A pull-up resistor element or a pull-down resistor element is connected with the buffer unit via a wiring portion. A current detection unit detects a direction of an electric current flowing through the wiring portion to output a safe specific voltage signal to the electronic control unit on disconnection of the wiring portion. A power-supply-voltage detection unit detects decrease in a power supply voltage applied to the movement detection unit. A voltage switching unit sets the voltage signal, which is outputted to the electronic control unit through the wiring portion, on a high-voltage side or a low-voltage side according to the detected direction of the electric current, on detection of decrease in the power supply voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.