Motors: expansible chamber type – Working member position feedback to motive fluid control – Electrical input and feedback signal means
Patent
1976-11-22
1979-08-14
Maslousky, Paul E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Electrical input and feedback signal means
91364, 91433, F15B 903, F15B 909, F15B 1316
Patent
active
041641671
ABSTRACT:
Disclosed is a hydraulic servomechanism including a control loop consisting of an input device, an adder-amplifier, a servovalve, a cylinder or actuator and a load operatively connected in the order named for controlling the position of the load, a position feedback loop and an acceleration feedback loop. In one embodiment of the invention, the hydraulic servomechanism further includes a feedback loop wherein an output from an accelerometer or pressure sensor for detecting a differential pressure across a piston in the cylinder and an error signal from the adder-amplifier are arithmetically processed and fed back to the adder-amplifier. In another embodiment, the hydraulic servomechanism further includes an additional feedback loop wherein an output from a two-input adder to which are applied a signal representative of a supply pressure of working oil to be delivered from the servovalve to the cylinder and a signal representative of a pressure difference across a piston of the cylinder is arithmetically processed and fed back to a divider inserted between the adder-amplifier and the servovalve. In both embodiments, shocks are substantially eliminated in a hydraulic system.
REFERENCES:
patent: 3390612 (1968-07-01), Wills
patent: 3410177 (1968-11-01), Roess et al.
Imai Isao
Muto Mitsuru
Ishikawajima-Harima Jukogyo Kabushiki Kaisha
Maslousky Paul E.
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