Hydraulic cylinder piston position sensing with compensation for piston velocity
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United States of America Patent
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Jan 20, 1998
Grant Date -
N/A
app pub date -
May 9, 1995
filing date -
May 9, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A piston position sensing system in which tabulated resonance width related information is stored in a form correlated with piston travel so that measured resonance width information can be compared with the stored information in determining piston position and compensation for the velocity of the piston is provided by correction for a time difference in serial sensing between the initial and the following extremes of a resonance signal as the piston moves. the compensation is developed from velocity information identified through previous and current processing cycles which assures reliability in detection of the subsequently sensed portion of the resonance signal envelope and enhanced sensitivity and accuracy through automatic application incrementally in a dynamic gain adjustment of the sensing system.
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