Patent ID: 6826504
Filing Date: 2004-11-30
Classification: F02D,H02N

Abstract:
Method for controlling a voltage applied to a piezoelectric element (10, 20, 30, 40, 50, 60) within a circuit (A) for charging and discharging the piezoelectric element (10, 20, 30, 40, 50, 60), comprising:modifying a target voltage for the voltage applied to the piezoelectric element (10, 20, 30, 40, 50, 60), in view of at least one systematic error occurring during a first control procedure of the voltage applied to the piezoelectric element to obtain a target voltage for a second and/or a further control of the voltage applied to the piezoelectric element; wherein: a) a system parameter, in particular the voltage across a piezoelectric element (10, 20, 30, 40, 50 or 60), is modified according to a predefined target value, in particular a target voltage (Utarget); b) the resulting value of the system parameter is measured by measuring means (600, 610; D, E); c) the measured value is compared to the predefined target value by comparison means (D, E); and d) a target value for a further modification of the system parameter is modified in consideration of detected differences between the measured value and the first predefined target value.