Patent ID: 6360721
Filing Date: 2002-03-26
Classification: F02M

Abstract:
A hydraulically actuated fuel injector comprising:a nozzle having a nozzle orifice and a nozzle chamber; a check movable between an open position that allows fluid communication between the nozzle chamber and the nozzle orifice, and a closed position that stops fluid communication between the nozzle chamber and the nozzle orifice; a check control chamber disposed such that fluid pressure in the check control chamber will exert a closing bias on the check; an actuation valve member fluidly connected with a high-pressure supply line, a low-pressure drain line, a check control line fluidly connected with the check control chamber, and a pressure control line, the actuation valve member being positionable at: a first position that fluidly connects the pressure control line to a first line of the high-pressure supply line and the low-pressure drain line; a second position different from the first position that fluidly connects the check control line to the high-pressure supply line and fluidly connects the pressure control line to a second line of the high-pressure supply line and the low-pressure drain line, the second line being different from the first line; and third position, different from the first and second positions, that fluidly connects the check control line with the low-pressure drain line and fluidly connects the pressure control line to the second line.