Motors: expansible chamber type – Working member position feedback to motive fluid control – Electrical input and feedback signal means
Patent
1985-10-04
1987-06-09
Yeung, James C.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Electrical input and feedback signal means
91521, 244233, F15B 1316
Patent
active
046711660
ABSTRACT:
An electrohydraulic actuator system has a first pair of actuators and a control circuit and a control valve for each actuator. The control circuits generate actuator position error signals and are also responsive to divergence of the operating position of the respective valves from a mean valve operating position thereby tending to maintain the valve operating positions, and hence the forces on the actuators, identical. The magnitudes of the position error signals are limited to limit overdrive of the valves in the event of minor malfunctions thereof and to permit a malfunction indication to be provided. The system also includes a further pair of actuators having an associated control circuit which is responsive to a selected differential position of the further actuators, for causing one of these actuators to be driven away from a limiting position of the other actuator until the required position differential is obtained.
REFERENCES:
patent: 2769603 (1956-11-01), McDonnell
patent: 3128968 (1964-04-01), Kaufman et al.
patent: 3422327 (1969-01-01), McBrayer et al.
patent: 3543641 (1970-12-01), Deplante
patent: 4294162 (1981-10-01), Fowler et al.
patent: 4370706 (1983-01-01), Doniger et al.
patent: 4437385 (1984-03-01), Kramer et al.
Burrage Robert G.
Glaze Stanley G.
Lucas Industries Public Limited Company
Yeung James C.
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