Control circuit for proportional electro-hydraulic fluid control

Details Control circuit for proportional electro-hydraulic fluid control Control circuit for proportional electro-hydraulic fluid control

1987-03-18

1988-02-16

Cohan, Alan

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

1374875, G05D 1600

Patent

active

047248653

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.

REFERENCES:
patent: 2747595 (1956-05-01), Dickey
patent: 3056417 (1962-10-01), Greaves
patent: 3077552 (1963-02-01), Koppel
patent: 3552428 (1971-01-01), Pemberton
patent: 3757808 (1973-09-01), Peterson
patent: 4285639 (1981-08-01), Woodring et al.
patent: 4630631 (1986-12-01), Barnes

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