Patent Number: 7,784,708

Title: Fuel injecting device and method for controlling said device

Abstract: A fuel injecting device and method of controlling the fuel injection device. The fuel injection device includes a cylindrical body, a needle whose end includes with a head forming a valve on a seat supported by the end of the cylindrical body, an actuator made of an electroactive material, including a rod and that displaces the head such that the valve is opened, and a prestressing device holding the needle and a counterweight such that they are pressed against the rod opposite end. The needle extends coaxially to the cylindrical body in a form of a rigid bar and axially resonates when exposed to axial pulses at a determined excitation frequency by the actuator.

Inventors: Guerbaoui; Samir (Paris, FR), Agneray; Andre (Boulogne, FR), Levin; Laurent (Paris, FR)

Assignee: RENAULT s.a.s.

International Classification: B05B 17/04 (20060101)

Expiration Date: 8/31/12018