| 摘要 |
PURPOSE: A method and an apparatus for controlling a system parameter are provided, which controls the system parameter with a low cost, especially for charging and discharging piezoelectric elements. CONSTITUTION: According to the method for controlling voltages applied to piezoelectric elements(10,20,30,40,50,60) in a circuit(A) to charge and discharge system parameter, especially the piezoelectric elements, at least one control parameter is varied to control a target voltage as to a voltage applied to the piezoelectric elements, by considering at least one system error generated during the first control process of the system parameter to obtain a corrected control parameter for the second and/or other control of the system parameter. The system parameter, especially the voltage over the piezoelectric elements is varied according to a target voltage, and a result of the system parameter is measured by measurement units(600,610;D,E). And the measured value is compared with a target value by comparator units(D,E). The target value for varying the system parameter is varied by considering a difference value detected between the measured value and the first target value.
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