Displacement amount measuring device
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United States of America Patent
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Oct 17, 2006
Grant Date -
Dec 8, 2005
app pub date -
May 12, 2005
filing date -
May 14, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A disclosed device eliminates an error in a displacement amount measured value caused by changes over time in a characteristic of a displacement sensor, and can always maintain high accuracy of measurement. When a hydraulic valve, to which the displacement sensor is mounted, is positioned at predetermined positions, output signals from the displacement sensor are acquired as sample values. On the basis of the acquired sample values, a trend of changes over time in the characteristic of the displacement sensor is computed. Settings of a conversion table, which is used for displacement amount computation, are corrected in a direction along the computed trend of changes.
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