Patent ID: 6604507
Filing Date: 2003-08-12
Classification: F02M

Abstract:
A fuel injector for generating a fuel injection event in the combustion chamber of an internal combustion engine, having a controller being shiftable from a first disposition toward a second disposition and returnably shiftable to the first disposition thereby defining initiation and termination of an injection event, such shifting acting to port an actuating fluid to stroke an intensifier plunger for compressing fuel in an intensifier pressure chamber, the intensifier pressure chamber having a fuel inlet port and being defined in part by a plunger head and further being in fluid communication with a needle valve, comprising;at least a first spill port being operably disposed in fluid communication with the intensifier pressure chamber and being spaced apart from the plunger head when the intensifier plunger is in a retracted disposition, the spill port spilling fuel from the pressure chamber for a select duration of time after initiation of the intensifier plunger compressive stroke motion such that no fuel injection occurs during the select duration of time, termination of the select duration of time occurring when the plunger head seals off the first spill port, the intensifier plunger being directly fluidly in communication with a needle valve surface, fuel pressure on the surface acting to open the needle valve, the motion of the compressive stroke motion of the intensifier plunger generating fuel pressure at an injectable level acting on the needle valve surface to provide substantially continuous injected fuel from the time that the plunger head seals off the first spill port until interruption of the compressive stroke motion.