Patent ID: 6036120
Filing Date: 2000-03-14
Classification: F02B,F02M,F16K,Y02T

Abstract:
A fuel injector including:a housing defining a fuel flow passage having an inlet and an outlet;means for connecting the inlet to a source of fuel supply at a controlled elevated fuel pressure;an injection valve operable to selectively close and open said outlet for injecting fuel through the outlet into an engine combustion chamber, the fuel pressure acting to urge the valve in an opening direction;return means urging said valve in a closing direction with a force slightly in excess of the force exerted by fuel pressure on the valve;an armature connected to and movable with the valve;first and second solenoids spaced closely on opposite sides of said armature and operative when energized to magnetically attract said armature toward the respective solenoids;said first solenoid when energized generating a force sufficient to attract the armature and open the valve against the excess closing force of the return means; andsaid second solenoid when energized generating a force sufficient to close the valve with the assistance of the return means against the force of fuel pressure when the first solenoid is de-energized.