Method of pressure controlling a hydrostatic machine having an a

Details Method of pressure controlling a hydrostatic machine having an a Method of pressure controlling a hydrostatic machine having an a

1994-08-12

1996-02-13

Look, Edward K.

Power plants

Pressure fluid source and motor

Methods of operation

60452, 60443, 91361, F16D 3100, F16D 3102, F15B 1316

Patent

active

054903831

ABSTRACT:
The present invention provides a method for pressure control of an adjustable pump for a hydraulic system including at least a load. Depending on the size of the system, i.e. the servo cylinder, hydrostatic machine and the line tubing, the fluid volume contained in the system between the adjustable pump and the low pressure side of the load is largely different. In controlling the load pressure in such a system, for example a press or a molding machine for plastic material, a pressure controller adaptively and automatically adjusts the damping factor of the controller and thus the controlling quality independent of the fluid volume of the system to a constant value. It is a benefit of the invention that all adjusting operations of the pressure controller are eliminated which have been necessary heretofore to obtain an appropriate control of the fluid system.

REFERENCES:
patent: 4375747 (1983-03-01), Friedrich
patent: 4537364 (1985-08-01), Pollman et al.
patent: 4689956 (1987-09-01), Hein
patent: 4741159 (1988-05-01), Gunda et al.
patent: 5070695 (1991-12-01), Metzner
Hummel, E.: u.a.: Digitale Hydraulische Sensortechnik am Beispiel einer Spritzgiebmaschine in: O+P Olhydraulik und Pneumatic, 36, 1992, Nr. 11, S. 730-737.
Backg, W.: Neue Moglichkeiten der Verdrangerregelungen, Mar. 1988 S. 25-35.

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