Patent ID: 11939739
Assignee: DANFOSS POWER SOLUTIONS INC.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A method of operating a hydraulic arrangement comprising a mounting base, a boom that is pivotably arranged on the mounting base, and a Z-kinematics that is arranged on the boom, the Z-kinematics being designed and arranged to tilt a tool attachment device, the tool attachment device being pivotably arranged on the boom,
wherein the boom is moved by at least a lifting hydraulic piston that is connected to the boom and to the mounting base,
and wherein the Z-kinematics is moved by at least a tilting hydraulic piston that is connected to a lever of the Z-kinematics and to the mounting base,
wherein on application of an input control command for changing the position of the lifting hydraulic piston, an initial compensation command is automatically generated and applied to the tilting hydraulic piston, to essentially maintain the attitude of the tool attachment device, where the initial compensation command is generated based on the input control command for the lifting hydraulic piston, using a mathematical model of the hydraulic arrangement and without using input from an angle sensor associated with the tool attachment device.