Method of closed-loop controlling a piezoelectric valve device, controller device and fluidic system
AssigneeFesto AG & Co.
InventorMathias Wahl
Life of this patent
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Abstract
A method for closed-loop controlling, in particular closed-loop pressure controlling, a piezo valve device, including the steps: calculating a control error integral signal representing a time integral of a control error of the closed-loop control of the piezo valve device, adjusting, based on the control error integral signal, at least one control opening voltage value defining within the closed-loop control an opening voltage value of a piezo valve of the piezo valve device, and using the adjusted at least one control opening voltage value, providing at least one drive voltage for driving the piezo valve within the closed-loop control.
Claims19
A method for closed-loop controlling a piezo valve device having at least one piezo valve, wherein the piezo valve has a real opening voltage value which is the voltage value with which the piezo valve must at least be driven so that it begins to open, wherein, within the closed-loop control, a control opening voltage value is used to follow changes in the real opening voltage value, the method comprising the steps:
- calculating a control error of the closed-loop control of the piezo valve device based on difference between a setpoint value and an actual value;
- calculating a proportional signal multiplying the control error by a coefficient;
- calculating a control error integral signal representing a time integral of the control error;
- calculating a pressurized fluid supply signal based on the proportional signal and the control error integral signal;
- adjusting, based on the control error integral signal, the control opening voltage value;
- adding the adjusted control opening voltage value as an offset value to the pressurized fluid supply signal to obtain at least one drive voltage for driving the piezo valve device within the closed-loop control;
- and
- providing the at least one drive voltage to the piezo valve device to drive the piezo valve within the closed-loop control.
A controller device for closed-loop pressure controlling a piezo valve device having at least one piezo valve, wherein the piezo valve has a real opening voltage value which is the voltage value with which the piezo valve must at least be driven so that it begins to open, wherein, within the closed-loop control, a control opening voltage value is used to follow changes in the real opening voltage value, the controller device being configured to:
- calculate a control error of the closed-loop control of the piezo valve device based on difference between a setpoint value and an actual value,
- calculate a proportional signal multiplying the control error by a coefficient;
- calculate a control error integral signal which represents a time integral of the control error,
- calculate a pressurized fluid supply signal based on the proportional signal and the control error integral signal,
- adapt the control opening voltage value based on the control error integral signal,
- add the adapted control opening voltage value as an offset value to the pressurized fluid supply signal to obtain at least one drive voltage for driving the piezo valve device within the closed-loop control, and
- provide the at least one drive voltage to the piezo valve device to drive the piezo valve within the closed-loop control.
Dependencies are inferred from the claim text.