FUEL INJECTING DEVICE AND METHOD FOR CONTROLLING SAID DEVICE

摘要

The inventive fuel injecting device comprises a cylindrical body (11, 12), a needle (2) whose end is provided with a head (20) forming a valve on a seat (14) supported by the end of the cylindrical body, an actuator (3) which is made of an electroactive material, is provided with a rod and displaces the head (20) in such a way that the valve is opened and a prestressing device holding the needle and a counterweight in such a way that they are pressed against the rod opposite end. The needle (2) extends coaxially to the cylindrical body (11, 12) in the form of a rigid bar and axially resonates when it is exposed to axial pulses at a determined excitation frequency by the actuator (3). A method for controlling said device is also disclosed.