Electrohydraulic valve control circuit with velocity fault detection and rectification
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United States of America Patent
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Sep 14, 2010
Grant Date -
Feb 14, 2008
app pub date -
Jul 31, 2007
filing date -
Aug 9, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Motion of a hydraulically driven machine component is controlled in response to a velocity command that indicates a desired velocity for the machine component. A method for detecting a velocity fault involves determining an actual velocity at which the machine component is moving, and producing a velocity error value based on a difference between the velocity command and the actual velocity. The velocity error value is integrated, such as by a low pass, biquadratic filter function, to produce an integrated value. The integrated value is compared to one or more thresholds to determine whether a velocity fault has occurred.
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