Perceived jack position drift compensation method and apparatus
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United States of America Patent
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Jul 10, 2012
Grant Date -
Jul 30, 2009
app pub date -
Jan 28, 2008
filing date -
Jan 28, 2008
priority date (Note) -
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Abstract
A controller commands a jack drive to extend and retract a jack leg relative to a jack base along a stroke having retraction and extension limits. The controller updates a perceived present leg position value in response to position change signals from a position change sensor. The controller occasionally applies compensation factors to the perceived present leg position value in the extension direction. The controller resets the perceived present leg position value whenever the jack leg reaches the retraction limit.
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