Fuel injection system and method for a combustion engine

摘要

Apparatus and methods for injecting gaseous fuel into a compression ignition engine are disclosed. A gaseous fuel injector includes a pintle valve and an intensifier. The pintle valve includes a pintle body defining a pintle bore therethrough, a first sealing surface disposed on a distal end of the pintle body, and a pintle disposed within the pintle bore. The pintle includes a shaft, a radially flared portion, and a second sealing surface disposed on a proximal face of the radially flared portion, such that the first sealing surface faces the second sealing surface. The intensifier includes an intensifier body defining a fuel pump chamber therein, the fuel pump chamber being fluidly coupled to a gaseous fuel supply and the pintle bore, a plunger having a distal end disposed in the fuel pump chamber, and an intensifier piston disposed on a proximal end of the plunger.

主权项

1. A gaseous fuel injector, comprising:
a pintle valve including:
a pintle body defining a pintle bore therethrough,a first sealing surface disposed on a distal end of the pintle body, anda pintle disposed within the pintle bore, the pintle including:
a shaft,a radially flared portion disposed at a distal end of the pintle,a second sealing surface disposed on a proximal face of the radially flared portion, such that the first sealing surface faces the second sealing surface, anda pintle piston disposed at a proximal end of the pintle, the pintle piston having a proximal face in fluid communication with a gaseous fuel supply via a check valve, the proximal end of the pintle being opposite the distal end of the pintle; an intensifier including:
an intensifier body defining a fuel pump chamber therein, the fuel pump chamber being fluidly coupled to a gaseous fuel supply and the pintle bore,a plunger having a distal end disposed in the fuel pump chamber, andan intensifier piston disposed on a proximal end of the plunger; and an extension tube disposed on the distal end of the pintle body, an internal surface of the extension tube defining an extension tube cavity therein, the extension tube cavity being in selective fluid communication with the pintle bore depending upon a position of the pintle relative to the pintle body.