Title: Hydraulic control system

Abstract: A hydraulic control system for use in machine tools, construction machines, hoists and the like, with a driven unit the hydraulic circuit of which is controlled by one or more electromagnetically positioned slide valves, and with an arrangement for automatically regulating the velocity of the hydraulic drive unit regardless of fluctuations in the pressure of the oil supply and similar disturbances. The regulating arrangement includes a potentiometer mechanically controlled by a flow meter interposed in the hydraulic circuit; and an electric comparator the inputs of which are connected to the potentiometer and to a desired-flow-value selector, respectively, and the output of which controls the valve electromagnet(s). In this manner the difference signal developed by the comparator is used to change the setting of the valve in a correcting sense. Several implementations for this regulating circuit and for the design of the flow meter and the valves are disclosed.

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Inventors: Haussler, Hubert (Zug, CH)

Application Number: 864652
Filing Date: 1977-12-27
Publication_date: 1980-06-03
Assignee: Beringer-Hydraulik GmbH (Zug, CH)
Primary Class(es): 91/449 91/433, 91/459, 137/486
Other Classes:
US Patent Ref:

3141386	Jul, 1964	Loughridge	91/449.
3732887	May, 1973	Hayner	137/486.
3763746	Oct, 1973	Walters	91/433.
4004607	Jan, 1977	Freese	137/486.
4031813	Jun, 1977	Walters et al.	91/433.

Other Refs:
Primary Examiner: Cohen, Irwin C.
Assistant Examiner:
Attorney: Shurtleff; John H.