Back to results
US 2003/0196433 A1Published application
Method for controlling a hydraulic activation unit
AssigneeKomatsu Mining Germany GmbH
InventorsMartin Baer, Klaus Graner
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeKomatsu Mining Germany GmbH
InventorsMartin Baer, Klaus Graner
Estimating the term…
A method of controlling an hydraulic activation unit includes the steps of using a characteristic diagram of a first hydraulic transformer as an input variable in the control unit; using a characteristic diagram of a second hydraulic transformer as an input variable in the control unit; and activating the hydraulic actuator responsive to the input variables. The hydraulic activation unit includes the hydraulic power unit, such as a hydraulic actuator or a hydraulic motor, for producing a force. The first hydraulic transformer is operably connected to a first side of the actuator for supplying a pressure. The second hydraulic transformer is operably connected to a second side of the actuator for supplying a pressure. The control unit for assessing the first and second hydraulic transformer operably activates the hydraulic actuator.
A method of controlling an hydraulic activation unit,
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
Backward citations are indexed for grants only.
Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass:…
Servomotor systems without provision for follow-up action ; Circuits therefor: systems essentially incorporating special features for controlling…
Servomotor systems without provision for follow-up action ; Circuits therefor: with only one servomotor
Variable capacity: with pilot circuit, e.g. for controlling a swash plate
Term end not estimated
This application claims priority to application DE 102 14 225.4 filed on Mar. 22, 2002 in Germany.
The invention relates to a method for controlling a hydraulic activation unit. In particular the invention relates to controlling the use of two hydraulic transformers per hydraulic cylinder, as used in construction machinery.
A controller for hydraulic transformers was proposed at the “Sixth Scandinavian International Conference of Fluid Power” (1999, Tampere, Finland) by P. Achten and Dr. J. O. Palmberg. Instead of the customary controller with control valves, a hydraulic transformer was proposed.
In the drawings:
FIG. 1 is a schematic of a hydraulic circuit, which includes an hydraulic cylinder and an activation unit, in accordance with one embodiment of the present invention.
FIG. 2 is a schematic of a hydraulic circuit, which includes an hydraulic motor and an activation unit, in accordance with one embodiment of the present invention.
In FIG. 1, pump 1 generates a volume flow from a reserve tank at a pressure in a common pressure line 2. Hydraulic transformers 3, 4 are connected to pressure links.
Pressure measuring devices 8, 9, 10 are connected to the pressure lines between hydraulic transformers 3, 4 and a hydraulic power unit for consuming hydraulic pressure as generating a force. In an embodiment shown in FIG. 1, the hydraulic power unit is a hydraulic cylinder 5. In an embodiment shown in FIG. 2, the hydraulic power unit is a hydraulic motor 5a.
With reference to FIG. 1, the controller 6, referred to in the drawing as “electronic motion control” is connected via the line 7 to the pump 1, the hydraulic transformers 3, 4, the pressure measuring devices 8, 9, 10. Controller 6 is also connected to control lever 11 and to other measuring devices (not shown).