Patent ID: 6766788
Filing Date: 2004-07-27
Classification: F02D,F02M

Abstract:
A fuel injector drive system for use in an internal combustion engine of a vehicle comprising:a solenoid; a armature mounted adjacent to said solenoid for controlling the amount of fuel entering said internal combustion engine; a spring operatively connected to said armature which holds said armature in a closed position when a magnetic force generated by said solenoid is not sufficient to overcome a biasing force of said spring; a circuit electrically connected to said solenoid which selectively provides a pre-charging current with an amperage nominally below an amperage necessary to move said armature for a period sufficient to plateau the pre-charging current level, a valve-opening current with an amperage much above an amperage necessary to move the armature but less than the maximum possible current level of the coil, for a period sufficient to ensure full opening, and a holding current with an amperage nominally above an, amperage necessary for said armature to return to said closed position for a period sufficient to provide said engine with fuel; a controller in electrical communication with said circuit for controlling time and duration of the application of said currents by said circuit; and a voltage source in electric communication with said circuitry for providing said circuit various voltages to obtain the said various current levels within the solenoid coil.