Methods and systems for a fuel injector

Patent metadata

Field	Value
Publication number	US-10458380-B2
Application number	US-201815921516-A
Country	US
Kind code	B2
Filing date	Mar 14, 2018
Priority date	Mar 14, 2018
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

Methods and systems are provided for a fuel injector. In one example, a system may include forming an annular venturi passage between an outlet surface of the fuel injector and a nozzle. The nozzle may further comprise one or more air entraining features that may work in concert with the annular venturi passage to promote air-fuel mixing.

First claim

The invention claimed is:

1. A system, comprising:
a fuel injector comprising an egg-shaped nozzle, wherein an opening is shaped to admit combustion chamber gases into a hollow interior of the egg-shaped nozzle forming an annular venturi passage between it and an outlet surface of the fuel injector.

2. The system of claim 1 , wherein the hollow interior expels combustion chamber gases to the outlet passage.

3. The system of claim 1 , wherein the opening is a first opening arranged along a central axis of the egg-shaped nozzle, further comprising a plurality of second openings configured to expel combustion chamber gases in the hollow interior, wherein the central axis is aligned with a greatest height of the egg-shaped nozzle.

4. The system of claim 3 , wherein a size of the first opening is equal to a combined size of each of the plurality of second openings.

5. The system of claim 3 , wherein the plurality of second openings are arranged below a largest width of the egg-shaped nozzle, and where the largest width of the egg-shaped nozzle corresponds to a portion of the egg-shaped nozzle configured to press against the outlet surface of a fuel injector body.

6. The system of claim 1 , wherein the egg-shaped nozzle is pressed against the outlet surface of a fuel injector body when in a first position, and where the egg-shaped nozzle is spaced away from the outlet surface of the fuel injector body to form the annular venturi passage when in a second position.

7. The system of claim 6 , wherein the fuel injector does not inject fuel into a combustion chamber when the fuel injector body is in the first position, and where the fuel injector injects fuel into the combustion chamber via the annular venturi passage when the egg-shaped nozzle is in the second position.

8. The system of claim 6 , wherein the egg-shaped nozzle moves away from the combustion chamber when moving from the first position to the second position.

9. A method, comprising:
adjusting a fuel injection angle of a fuel injector via adjusting an interface between a rod coupled to an actuator and a venturi-shaped nozzle, the fuel injection angle decreased via actuating the rod away from the venturi-shaped nozzle.

10. The method of claim 9 , wherein the fuel injection angle is increased via actuating the rod toward the venturi-shaped nozzle, the rod pressing the venturi shaped nozzle toward a combustion chamber.

11. The method of claim 9 , wherein the fuel injection angle is decreased during an intake stroke.

12. The method of claim 9 , wherein the fuel injection angle is increased exactly before a spark plug is activated, wherein the spark plug is activated before a termination of a compression stroke.

13. The method of claim 12 , wherein the fuel injector performs five fuel injections prior to the spark plug being activated, and where four of the fuel injections comprises a decreased fuel injection angle.

14. The method of claim 9 , wherein the fuel injection angle is measured between a central axis of the fuel injector and a central axis of a fuel injection.

15. The method of claim 9 , wherein the venturi-shaped nozzle comprises a venturi passage extending along a central axis of the fuel injector, and where the venturi-shaped nozzle forms an annular venturi passage when it is spaced away from an outlet surface of the fuel injector.

16. A system, comprising:
an engine having at least one combustion chamber;
a fuel injector positioned to inject into the at least one combustion chamber, the fuel injector comprising an egg-shaped nozzle having a one or more openings fluidly coupling a hollow interior of the egg-shaped nozzle to the at least one combustion chamber; and
a controller with computer readable-instructions stored on non-transitory memory thereof that when executed enable the controller to:
press the egg-shaped nozzle against an outlet surface of the fuel injector in a first position; and
move the egg-shaped nozzle away from the outlet surface of the fuel injector in a second position.

17. The system of claim 16 , wherein the second position further comprising an outlet passage forming between the egg-shaped nozzle and the outlet surface, wherein the outlet passage comprises an annular venturi shape.

18. The system of claim 17 , further comprising a plurality of passages extending from a sac of the fuel injector to the outlet passage, and where the one or more openings of the egg-shaped nozzle comprises a first opening and a plurality of second openings, and where the plurality of second openings are closer to the combustion chamber in the first position than outlets of the plurality of passages, and where the plurality of second openings are farther from the combustion chamber in the second position than the outlets of the plurality of passages.

19. The system of claim 16 , wherein the one or more openings comprise a first opening aligned with a central axis of the fuel injector, further comprising a plurality of second openings radially spaced away from the central axis of the fuel injector.

20. The system of claim 19 , wherein the first opening is configured to only admit gases into the hollow interior, and where the plurality of second openings are configured to only expel gases from the hollow interior.

Assignees

• Ford Global Tech Llc

Inventors

• Zhang Xiaogang
• Yi Jianwen James
• Basmaji Joseph F
• Meinhart Mark
• Hong Sangjin

Classifications

• F02M61/18

  Injection nozzles, e.g. having valve seats; {Details of valve member seated ends, not otherwise provided for} · CPC title

• F02D41/30

  Controlling fuel injection {(F02D41/182, F02D41/24 take precedence)} · CPC title

• F02M69/047

  injectors with air chambers, e.g. communicating with atmosphere for aerating the nozzles (F02M69/325 takes precedence) · CPC title

• F02M67/04

  the air being extracted from working cylinders of the engine · CPC title

• F02M61/08

  the valves opening in direction of fuel flow {(F02M61/047 takes precedence)} · CPC title