Control circuit for proportional electro-hydraulic fluid control valves
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United States of America Patent
Stats
-
Feb 16, 1988
Grant Date -
N/A
app pub date -
Mar 18, 1987
filing date -
Mar 19, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control circuit for a proportional electro-hydraulic fluid control valve in which during a transient condition with a feedback control signal varying rapidly the control loop is changed to an open loop to change the transient characteristic of the valve to prevent the occurrence of an abnormal surge. The control circuit includes a control loop changeover circuit designed so that when the error signal is greater than a predetermined level, the control mode of the magnitude control of a control output signal is changed from a closed loop control in accordance with the feedback signal to an open loop control in accordance with an input signal.
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Cited Art Landscape
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