초록 ▼

A fuel injector for an internal combustion engine. The injector body contains a variable volume control chamber to and from which control fluid is supplied and drained to operate an intensifier piston which repetitively injects fuel from an injection chamber within the body. An electric-operated sup

A fuel injector for an internal combustion engine. The injector body contains a variable volume control chamber to and from which control fluid is supplied and drained to operate an intensifier piston which repetitively injects fuel from an injection chamber within the body. An electric-operated supply valve selectively controls flow of control fluid through a supply passage to the control chamber, and an electric-operated drain valve selectively controls flow of control fluid through a drain passage from the control chamber. Each valve is selectively operable independent of the other, and flow through the supply passage is independent of flow through the drain passage, and vice versa.

대표청구항 ▼

[ What is claimed is:] [1.] A fuel injector for an internal combustion engine, the fuel injector comprising a body, a variable volume injection chamber within the body, a fuel port at which fuel enters the body, a fuel passage for conveying fuel from the fuel port to the injection chamber, a fuel in

[ What is claimed is:] [1.] A fuel injector for an internal combustion engine, the fuel injector comprising a body, a variable volume injection chamber within the body, a fuel port at which fuel enters the body, a fuel passage for conveying fuel from the fuel port to the injection chamber, a fuel injection port at which fuel from the injection chamber is injected from the body, a variable volume control chamber, a control fluid supply port at which control fluid enters the body, a control fluid drain port at which control fluid drains from the body, a piston operatively relating the injection chamber and the control chamber such that the volume of the injection chamber varies inversely with the volume of the control chamber, a supply passage for conveying control fluid from the supply port to the control chamber, an electric-operated supply valve comprising an electric supply valve actuator and a supply valve mechanism controlled by the electric supply valve actuator for selectively controlling flow of control fluid through the supply passage, and a drain passage for conveying control fluid from the control chamber to the drain port, an electric-operated drain valve comprising an electric drain valve actuator and a drain valve mechanism controlled by the electric drain valve actuator for selectively controlling flow of control fluid through the drain passage, each valve actuator being selectively operable independent of the other to selectively operate the respective valve mechanism independent of the other, and the supply and drain passages being mutually independent such that fluid flow through each is independent of fluid flow through the other, and in which the supply valve closes the supply passage to flow when the electric supply valve actuator is not electrically energized by electric current, and the drain valve opens the drain passage to flow when the electric drain valve actuator is not energized by electric current.