Method and device for control of a capacitive actuator
AssigneeSiemens Aktiengesellschaft
InventorChristian Augesky
Life of this patent
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Abstract
A piezoelectric actuator on an injection valve is controlled by application of a control curve, on which the maximum amplitudes for a current for controlling the actuator are given. A slowly rising or falling charge course at the beginning or end of a charging or discharging process and hence a linearly controllable charge level can thus be achieved over time. An overdriving of the actuator can thus be prevented.
Claims13
1-12. (canceled)
A method for controlling an actuator, including a piezoelectric actuator, which comprises the steps of:
- charging or discharging the actuator in at least three stages, each of the three stages having a predefined duration of a current further defined by the steps of:
- during a first duration, increasing a maximum amplitude of the current from a predefined minimum to a predefined first maximum;
- during a second duration, keeping the maximum amplitude of the current substantially constant;
- and
- during a third duration, lowering the maximum amplitude of the current from a further predefined maximum to a further predefined minimum.
A device for controlling an actuator, including piezoelectric actuators, the device comprising:
- a final stage having a control input;
- and
- a control unit providing a control voltage to operate said final stage, the control voltage rising during a first predefined period from a predefined minimum to a predefined maximum, remaining constant during a second predefined period and falling during a third predefined period from a further predefined maximum to a predefined final value.
Dependencies are inferred from the claim text.