Patent ID: 9181890
Filing Date: 2015-11-10
Classification: F02D,F02M

Abstract:
1. In an engine, a method of operating an intensifier type fuel injector having an intensifier piston responsive to actuation fluid pressure and at least one intensifier plunger in a plunger cylinder having a movement in a first direction to intensify the pressure of the fuel, and in a second direction when actuating fluid pressure is removed from the intensifier piston for refilling the plunger cylinder with fuel for intensification while the plunger moves in a second direction, the intensifier plunger having a limited stroke, comprising: a) closing a needle of the fuel injector b) intensifying fuel in a needle chamber surrounding the needle and in at least one intensified fuel storage volume within the injector to a desired pressure using the intensifier; c) isolating the intensified fuel in the needle chamber surrounding the needle and in the at least one intensified fuel storage volume from the intensifier plunger by removing the actuating fluid pressure from the intensifier piston before d); and, d) controllably opening and closing the needle for successive multiple fuel injection events while the intensified fuel is isolated from the intensifier plunger e) then repeating b) through d).