Method for determining the individual control voltage of a piezoelectric element
AssigneeRobert Bosch GmbH
InventorsKai Sutter, Andreas Rau
Life of this patent
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Abstract
In a method for ascertaining the control voltage of a piezoelectric element, the voltage drop at the piezoelectric element following a charge process is measured and the control voltage of the piezoelectric element is inferred from this voltage drop.
Claims12
A method for determining a control voltage of a piezoelectric element, comprising:
- sensing a voltage drop at the piezoelectric element after a charge process, the sensing of the voltage drop including:
- measuring a first voltage at the piezoelectric element immediately following the charge process;
- measuring a second voltage at the piezoelectric element immediately prior to a subsequent discharge process;
- and
- subtracting the first and second voltages from each other to provide a difference;
- and
- determining the control voltage of the piezoelectric element from the difference.
A method for ascertaining a control voltage of a piezoelectric element, the method comprising:
- measuring a first voltage applied at the piezoelectric element following a charge process;
- measuring a second voltage applied at the piezoelectric element prior to a subsequent discharge process;
- subtracting the first and second applied voltages from each other to provide a difference;
- inferring the control voltage of the piezoelectric element from the difference, wherein the control voltage is inferred from a characteristic representing a relation between the difference and the control voltage;
- and
- ascertaining the characteristic experimentally on the basis of a large number of measurements at different actuators.
A method for ascertaining an individual control voltage of a piezoelectric element, the method comprising:
- measuring a voltage drop at the piezoelectric element following a charge process;
- increasing the voltage applied at the piezoelectric element during the charge process iteratively until a voltage applied at the piezoelectric element immediately following the charge process does not deviate from a voltage applied at the piezoelectric element immediately prior to a subsequent discharge process;
- and
- rating the voltage as an individual voltage requirement, from which the individual control voltage of the piezoelectric element is inferred.
A method for ascertaining a control voltage of a piezoelectric element, the method comprising:
- measuring a voltage drop at the piezoelectric element following a charge process;
- inferring the control voltage of the piezoelectric element from the voltage drop;
- applying only one voltage to the piezoelectric element;
- and
- increasing a charge time iteratively until a voltage applied at the piezoelectric element immediately following the charge process does not deviate from a voltage applied at the piezoelectric element immediately prior to a subsequent discharge process.
A method for ascertaining a control voltage of a piezoelectric element, the method comprising:
- measuring a voltage drop at the piezoelectric element following a charge process;
- applying only one voltage to the piezoelectric element;
- and
- inferring the control voltage of the piezoelectric element by increasing a charge time iteratively until a voltage applied at the piezoelectric element immediately following the charge process does not deviate from a voltage applied at the piezoelectric element immediately prior to a subsequent discharge process.
Dependencies are inferred from the claim text.