Method and apparatus for limiting the capacity of a hydrostatic

Details Method and apparatus for limiting the capacity of a hydrostatic Method and apparatus for limiting the capacity of a hydrostatic

1992-04-02

1994-08-23

Black, Thomas G.

Boots, shoes, and leggings

60448, 60452, F04B 4906

Patent

active

053413113

ABSTRACT:
The present invention relates to a hydraulic secondary control system comprising a hydrostatic machine as a secondary unit which is connected to a pressure line in which an impressed pressure of approximately constant value is generated by a hydrostatic machine as a primary unit. The volume capacity of the secondary unit determines the torque delivered to a load and the torque needed by the load determines the speed of the secondary unit. When the desired speed and thus the volume capacity of the secondary unit is too high, the capacity exceeding the capacity of the primary unit supplying the pressure line, the pressure breaks down. To prevent this, the present invention provides to calculate a permissible capacity as defined by the rotary angle for the secondary unit in accordance with the nominal quantities of the primary and secondary unit. When the rotary angle of the secondary unit will be increased beyond the permissible value, the capacity is limited so that the volume of the secondary unit does not exceed the permissible value, thus maintaining the impressed pressure in the pressure line.

REFERENCES:
patent: 4474104 (1984-10-01), Creffield
patent: 4712376 (1987-12-01), Hadank et al.
patent: 4845950 (1989-07-01), Metzner
patent: 5070695 (1991-12-01), Metzner
patent: 5193342 (1993-03-01), Omberg et al.

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