FUEL INJECTOR WITH CONTROLLED HIGH PRESSURE FUEL PASSAGE

摘要

A unit fuel injector (50), the injector (50) internally preparing fuel during an injection event at a pressure sufficient for injection by means of an intensifier (84) driven by a pressurized non−fuel actuating fluid selectively ported to the intensifier (84), includes a selectively actuatable controller (300) interposed in a fuel passage (74), the fuel passage (74) effecting fluid communication between an intensifier fuel chamber and a needle valve (78), the controller (300) being shiftable between an open and a closed disposition for selectively opening and closing the fuel passage (74) during the injection event.