Programmable diesel fuel injector

Abstract

An apparatus for injecting fuel into a combustion chamber of an internal combustion engine. The apparatus includes a solid magnetostrictive material with a favored direction of magnetostrictive response formed into a shape with ends that are substantially parallel to each other and substantially perpendicular to the favored direction of magnetostrictive response. A fuel control valve element is located coaxial to the favored direction of magnetoelastic response of the magnetostrictive material, the element opening inwardly. A solenoid coil is located concentric with the magnetostrictive material and coaxial to the favored direction of magnetoelastic response, the solenoid coil adapted to excite the magnetostrictive material into mechanical motion. An excitation signal is provided within the solenoid coil consisting of a signal, before a main current signal, sufficient to cause magnetic domain alignment but not rotation, and finally a magnetic return path circuit is provided in magnetic communication with the solid magnetostrictive material.

Dependencies are inferred from the claim text.