Patent ID: 6966760

Claim:
A fuel injection system for an internal combustion engine, comprising: a fuel reservoir; and at least one reciprocating fuel pump assembly in fluid communication with the fuel reservoir, each of the at least one reciprocating fuel pump assemblies comprising: a housing assembly including a drive section and an adjacent pump section; a drive assembly disposed in the drive section, the drive assembly including a permanent magnet having a first magnetic field and a coil assembly having a winding; one of the magnet and the coil assembly being capable of reciprocal movement along an axis between a first position and a second position with respect to the other, the one forming, at least in part, a movable member; a controller capable of generating a first and a second signal; application to the winding of the first signal having a first polarity and a first amplitude generating a second magnetic field interacting with the first magnetic field to control movement of the movable member between the first position and the second position; application to the winding of the second signal having a second polarity and a second amplitude generating a third magnetic field interacting with the first magnetic field to control movement of the movable member between the second position and the first position; the first polarity being opposite to the second polarity, the first and second signals being independently alterable as a function of engine demand; a resilient member biasing the movable member in the first position; and a pump assembly disposed in the pump section, the pump assembly including a pump member capable of reciprocal movement, the pump member operatively connected to the movable member, movement of the movable member causing movement of the pump member.