초록 ▼

A hydraulically actuated fuel injector has an electronically controlled actuator that moves an actuation valve member. The actuator can position the actuation valve member at one position to cause pressurization of fuel in a nozzle chamber for fuel injection, and at another position to hydraulically

A hydraulically actuated fuel injector has an electronically controlled actuator that moves an actuation valve member. The actuator can position the actuation valve member at one position to cause pressurization of fuel in a nozzle chamber for fuel injection, and at another position to hydraulically bias a check to halt fuel injection while maintaining full fuel pressure in the nozzle chamber indefinitely.

대표청구항 ▼

1. 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 noz

1. 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.