METHOD AND DEVICE FOR REPOLARIZING A PIEZOELECTRIC ACTUATOR OF AN INJECTOR OF AN INTERNAL COMBUSTION ENGINE OF A VEHICLE HAVING BEEN USED

摘要

The present invention relates to a method of repolarizing a piezoelectric actuator of an injector of an internal combustion engine of a vehicle that has been used, the piezoelectric actuator having undergone an initial polarization before putting the vehicle into service. , the method comprising the following steps, the piezoelectric actuator being associated with the injector, the latter being mounted on the motor, the motor being stopped: • applying a first voltage (V1) electrical bias across the piezoelectric actuator for a first time (T1) determined by ten minutes minimum, • stop the application of the first bias voltage during a second time (T2), successive to the first time, at least equal to the latter, • apply a second voltage ( V2) electrical polarization at the terminals of the piezoelectric actuator during a third time (T3) determined, successive second time, terminating the application of the second voltage bias across the piezoelectric actuator after the third time, the first, second and third successive time defining a sequence of repolarization of the piezoelectric actuator.