Method for operating a hydraulic drive
AssigneeRobert Bosch GmbH
InventorsMatthias Wahler, Henning Freigang, Thomas Sendelbach
Life of this patent
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Abstract
The disclosure relates to a method for operating a hydraulic drive which comprises a hydraulic consumer with a positionable piston in a cylinder which is connected to a tank at one connection via a pump of variable rotational speed and at another connection via a proportional valve, wherein a position of the piston is controlled using a model-based control in which a rotational speed of the pump is used as a manipulated variable and in which a position of the proportional valve is preset.
Claims12
A method for operating a hydraulic drive, the hydraulic drive including a hydraulic consumer having a positionable piston in a cylinder, the cylinder connected to a tank at a first connection via a pump of variable rotational speed and connected to the tank at a second connection via a proportional valve, the method comprising:
- controlling a position of the piston using a model-based control process in which a rotational speed of the pump is a manipulated pump variable and in which a position of the proportional valve is preset;
- and
- adjusting a setpoint value for the proportional valve by using an inverse system model of the hydraulic drive, wherein adjusting the setpoint value includes inferring, to achieve the setpoint value, a force on the positionable piston associated with the setpoint value using a setpoint profile of positions of the proportional valve from a planning of setpoint pressures in the hydraulic drive and from resultant positions of the proportional valve.
A computer for operating a hydraulic drive, the hydraulic drive including a hydraulic consumer having a positionable piston in a cylinder, the cylinder connected to a tank at a first connection via a pump of variable rotational speed and connected to the tank at a second connection via a proportional valve, the computer configured to:
- control a position of the piston using a model-based control process in which a rotational speed of the pump is a manipulated pump variable and in which a position of the proportional valve is preset;
- and
- adjust a setpoint value for the proportional valve by using an inverse system model of the hydraulic drive, wherein the adjusting the setpoint value includes inferring, to achieve the setpoint value, a force on the positionable piston associated with the setpoint value using a setpoint profile of the position of the proportional valve from a planning of setpoint pressures in the hydraulic drive and from resultant positions of the proportional valve.
Dependencies are inferred from the claim text.