METHOD FOR CONTROLLING AT LEAST ONE PIEZOELECTRIC ACTUATOR OF A FUEL INJECTOR OF AN INTERNAL COMBUSTION ENGINE

摘要

The invention relates to a method for controlling a piezoelectric actuator of a fuel injector comprising the steps of: applying a first nominal electric charge (Qc) to the actuator so as to open the valve means of the injector for a fuel injection; ordering the closing of the injector in order to stop the fuel injection by the application of an electric discharge (Qd) to the actuator so as to close the valve means; and on top of the first nominal charge after the application of same and before the step consisting in ordering the closing of the injector applying at least one second electric charge (Qp) so called polarisation charge to the actuator so as to polarise the piezoelectric actuator during an opening phase of the injector and during the injection of the fuel into the combustion chamber.