Position sensing device and method for implementing failsafe control on position sensing system including the same
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United States of America Patent
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Jul 16, 2013
Grant Date -
Jun 14, 2012
app pub date -
Nov 18, 2011
filing date -
Dec 10, 2010
priority date (Note) -
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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.
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