Position sensing device, rotational actuator having the same, shift-by-wire system having the rotational actuator, and method for detecting position of movable member
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United States of America Patent
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Sep 16, 2014
Grant Date -
Mar 28, 2013
app pub date -
Aug 31, 2012
filing date -
Sep 28, 2011
priority date (Note) -
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Abstract
A pulse signal output unit sends three-phase pulse signals according to movement of the movable member. A counter unit adds a first predetermined value or a second predetermined value to a count value or subtracts the first predetermined value or the second predetermined value from the count value, according to a combination of the pulse signals appearing when all the pulse signals are normal and a combination of the pulse signals appearing when one of the pulse signals malfunctions. A position detection unit detects the position of the movable member according to the count value.
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