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US 11,378,109 B2Granted
Adaptive friction minimization for electrohydraulic actuators
AssigneeZF Friedrichshafen AG
InventorSebastian Steidle
Life of this patent
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Abstract
A method of controlling an electro-hydraulic actuator (101). An electric voltage applied to the actuator (101) is established by superimposing a control variable with an oscillatory signal. A hydraulic pressure, influenced by the actuator (101), is measured. The oscillatory signal is adapted as a function of the measured hydraulic pressure.
Claims9
A method of controlling an electro-hydraulic actuator, the method comprising:
- establishing an electric voltage applied to the actuator by superimposing an oscillatory signal on a control variable, and the superimposed oscillatory signal causing the actuator to oscillate mechanically and thereby reducing mechanical friction occurring in the actuator;
- measuring a hydraulic pressure influenced by the actuator;
- and
- adapting the oscillatory signal as a function of the measured hydraulic pressure.
1 more element
A method of controlling an electro-hydraulic actuator, the method comprising:
- establishing an electric voltage applied to the actuator by superimposing an oscillatory signal on a control variable, and the superimposed oscillatory signal being designed to reduce mechanical friction, occurring in the actuator, without any interference occurring between the control variable and the oscillatory signal so that the electric voltage, established by the superimposition, fluctuates with time;
- measuring a hydraulic pressure influenced by the actuator;
- and
- adapting the oscillatory signal as a function of the measured hydraulic pressure.
1 more element
A method of controlling an electro-hydraulic actuator, the method comprising:
- establishing an electric voltage applied to the actuator by superimposing an oscillatory signal on a control variable, and the superimposed oscillatory signal being designed to reduce mechanical friction, occurring in the actuator, without any interference occurring between the control variable and the oscillatory signal so that the electric voltage, established by the superimposition, fluctuates with time, and the oscillating electric voltage causing the actuator to oscillate mechanically so as to reduce mechanical friction of the actuator as well as excite the actuator into oscillation;
- measuring a hydraulic pressure influenced by the actuator;
- and
- adapting the oscillatory signal as a function of the measured hydraulic pressure.
1 more element
Dependencies are inferred from the claim text.