Method for controlling a hydraulic system
AssigneeSchaeffler Technologies AG & Co. KG
InventorsMarc Rambert, Nicolas Leriche
Life of this patent
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Abstract
A method for controlling a hydraulic system for actuating a drive train device of a drive train of a motor vehicle includes a first volumetric flow of a pressure medium being provided by an electrically operated pump, and a slave cylinder piston of a slave cylinder being actuated along an actuation path, in a manner controlled by a switch valve, via a second volumetric flow generated from the first volumetric flow. A leakage in the hydraulic system is determined from a comparison of the first and second volumetric flows.
Claims20
A method for controlling a hydraulic system for actuating a drive train device of a drive train of a motor vehicle, comprising:
- providing a first volumetric flow of a pressure medium via an electrically operated pump;
- actuating, via a second volumetric flow generated from the first volumetric flow, a slave cylinder piston of a slave cylinder along an actuation path, in a manner controlled by a switch valve;
- during actuation of the slave cylinder, determining the first volumetric flow from rotational parameters and an electric current of an electric motor driving the pump, and mechanical constants of the hydraulic system;
- and
- determining a leakage in the hydraulic system from a comparison of the first and second volumetric flows.
A method for controlling a hydraulic system for actuating a drive train device of a drive train of a motor vehicle, the method comprising:
- providing, via a pump, a first volumetric flow of a pressure medium to a switch valve;
- controlling the switch valve to provide a second volumetric flow of the pressure medium to actuate a piston of a cylinder, wherein the second volumetric flow is generated from the first volumetric flow;
- determining a pump leakage based on the first volumetric flow and the second volumetric flow;
- and
- detecting wear in the pump by comparing the determined leakage to an initial pump leakage determined in an initial state of the pump.
A method for controlling a hydraulic system for actuating a drive train device of a drive train of a motor vehicle, comprising:
- providing a first volumetric flow of a pressure medium via an electrically operated pump;
- actuating, via a second volumetric flow generated from the first volumetric flow, a slave cylinder piston of a slave cylinder along an actuation path, in a manner controlled by a switch valve;
- determining a leakage in the hydraulic system from a comparison of the first and second volumetric flows;
- determining, in an initial state, a first leakage;
- continuously comparing the first leakage with the leakage;
- and
- determining a measure of the leakage from the comparison.
Dependencies are inferred from the claim text.