Control system

Details Control system Control system

1975-03-21

1976-03-16

Cohan, Alan

Fluid handling

Systems

Programmer or timer

91414, 13759616, 340147MT, F15B 1306

Patent

active

039439739

ABSTRACT:
A control system for remote proportional positioning of hydraulic directional control valves includes pulse duration modulation control of electrohydraulic converters controlling hydraulic valve spool positioners. Pulse groups supplied to the converters have a repetition rate of the order of 50 Hz to cause mechanical vibrations in the hydraulic liquid and the valve positioners, thereby reducing frictional hysteresis.

REFERENCES:
patent: 3822723 (1974-07-01), Crowell

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