Method for polarizing a piezo ceramics device e.g. for vehicle fuel injection system, involves using multiple DC consecutive pulses with pulse form corresponding to operation of piezo ceramics in motor vehicle.

摘要

A main body (1) is made from unpolarized ceramic material with two or more electrodes with flat surfaces facing each other. A number of voltage pulses (4) are applied to the electrodes, whose pulse levels follow an envelope curve (5) by depending on time. The curve grows in a first section during a build-up time (TA) from a minimum voltage (UMIN) to a maximum voltage (UMAX) and holds the maximum voltage in a second section during a holding time (TH).