Dynamic characteristic compensating device for electrical hydrau

Details Dynamic characteristic compensating device for electrical hydrau Dynamic characteristic compensating device for electrical hydrau

1987-12-07

1989-04-04

Garrett, Robert E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

91364, 91367, F15B 1316

Patent

active

048174980

ABSTRACT:
In a dynamic characteristic compensating device for an electrical hydraulic servo actuator, a differential pressure detecting piston is displaced in proportion to the difference in pressure between two hydraulic operating chambers provided on opposite sides of the main piston in the actuator, and a speed detector converts the displacement of the differential pressure detecting piston into an electrical signal. The electrical signal is fed back to the control signal input circuit side of an electrical hydraulic servo valve, to control the valve in such a manner that differential pressure variations due to disturbances applied to the actuator are canceled out by the feedback signal.

REFERENCES:
patent: 3738609 (1973-06-01), Divigard
patent: 4164167 (1979-08-01), Imai et al.
patent: 4328449 (1982-05-01), Calligaris
patent: 4445421 (1984-05-01), Walker et al.

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