Multi-chamber igniter

• US 8,839,762 B1
• Filed: 06/10/2013
• Issued: 09/23/2014
• Est. Priority Date: 06/10/2013
• Status: Active Grant

• Current Assignee: Woodward Incorporated
• Original Assignee: Woodward Incorporated
• Inventors: Chiera, Domenico, Hampson, Gregory James, Polley, Nolan
• Primary Examiner(s): Cronin, Stephen K
• Assistant Examiner(s): VILAKAZI, SIZO BINDA
• Application Number:
  US13/913,840
• Time in Patent Office: 470 Days
• Field of Search: 123/169.R, 123/253, 123/254, 123/260, 123/262, 123/263, 123/266, 123/286, 123/143.R, 123/256, 123/267, 313/143
• US Class Current: 123/256
• CPC Class Codes: F02B 19/108 with fuel injection at least into pre-combustion chamber, i.e. injector mounted directly in the pre-combustion chamber
• CPC Class Codes: F02B 19/1095 with more than one pre-combustion chamber (a stepped form of the main combustion chamber above the piston is to be considered as a pre-combustion chamber if this stepped portion is not a squish area)
• CPC Class Codes: F02B 19/12 with positive ignition engines with non-timed positive ignition, and with incandescent chambers F02B9/08
• CPC Class Codes: F02B 19/18 Transfer passages between chamber and cylinder
• CPC Class Codes: F02P 13/00 Sparking plugs structurally combined with other parts of internal-combustion engines connection of ignition coil to spark plug connector F02P3/02; with fuel injectors F02M57/06 ; spark plug connector per se H01T13/04 – H01T13/06; predominant aspects of sparking plug, see H01T13/40 – H01T13/44
• CPC Class Codes: H01T 13/54 having electrodes arranged in a partly-enclosed ignition chamber
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

Air/fuel mixture is received from a combustion chamber of the internal combustion engine into an enclosure about a flame kernel initiation gap between a first ignition body and a second ignition body. Air/fuel mixture received into the enclosure is directed into a flame kernel initiation gap. The mixture is then ignited in the flame kernel initiation gap.

Claims

1. A system for igniting a mixture in an internal combustion engine, the system comprising:

a plug body adapted to couple to the internal combustion engine and comprising a shell;

a first ignition body carried by the plug body in the shell;

a second ignition body carried by the plug body in the shell and adjacent the first ignition body to define a flame kernel initiation gap between the second ignition body and the first ignition body;

an enclosure comprising a jet passage and defining a chamber about an end of the shell that is larger in volume than a fluid containing interior of the shell, the chamber adapted to direct flow incoming through the jet passage to circulate in the chamber and recombine with the incoming flow adjacent to the jet passage and orthogonally to or in the general direction of the incoming flow.

2. The system of claim 1 where the enclosure comprises an outer enclosure and the chamber comprises an outer chamber;

and

where the system further comprises an inner enclosure within the outer chamber and defining an interior chamber that encloses the first and second ignition bodies, the inner enclosure comprising a jet passage adapted to direct a flow incoming through the jet passage of the inner enclosure primarily toward the first and second ignition bodies.

3. The system of claim 1, comprising a tubular receiver housing comprising the enclosure, the receiver housing adapted to receive and couple to the plug body and adapted to couple to the internal combustion engine.

10. The system of claim 1, where the second ignition body is a tube that is continuous without any breaks.

4. A system for igniting a mixture in an internal combustion engine, the system comprising:

a plug body adapted to couple to the internal combustion engine and comprising a shell;

a first ignition body carried by the plug body in the shell;

a second ignition body carried by the plug body in the shell and adjacent the first ignition body to define a flame kernel initiation gap between the second ignition body and the first ignition body;

an enclosure comprising a jet passage and defining a chamber about an end of the shell that is larger in volume than a fluid containing interior of the shell, the chamber adapted to direct flow incoming through the jet passage to circulate in the chamber and recombine with the incoming flow adjacent to the jet passage and orthogonally to or in the general direction of the incoming flow;

where the enclosure comprises an outer enclosure and the chamber comprises an outer chamber;

where the system further comprises an inner enclosure within the outer chamber and defining an interior chamber that encloses the first and second ignition bodies, the inner enclosure comprising a let passage adapted to direct a flow incoming through the let passage of the inner enclosure primarily toward the first and second ignition bodies;

where the jet passage of the outer enclosure comprises a central passage oriented to direct incoming flow to impinge onto the inner enclosure; and

where the jet passage of the inner enclosure comprises a central jet passage oriented to receive flow impinging on the inner enclosure and direct the received flow primarily towards the flame kernel initiation gap.

5. The system of claim 4, where second ignition body surrounds the first ignition body and comprises a tubular portion extending axially forward, beyond the first ignition body.

6. The system of claim 5, where the inner enclosure comprises:

a peripheral jet passage adapted to receive flow impinging on the inner enclosure and direct the received flow to an exterior of the second ignition body and to swirl in the inner enclosure.

7. The system of claim 6, where the second ignition body is configured to cause the flow in the ignition gap to flow rearward and to protect flow in the ignition gap from disturbances from flow from the peripheral jet passage.

8. The system of claim 4, where the inner enclosure is conical and is adapted to deflect flow from the central passage, laterally towards a sidewall of the outer chamber.

9. The system of claim 8, where the outer chamber is shaped to direct flow from the central passage to generate a generally toroidal flow vortex in the outer chamber and generate turbulence in the outer chamber.

11. A method of igniting an air/fuel mixture in an internal combustion engine, the method comprising:

receiving the air/fuel mixture as an incoming air/fuel mixture flow from a combustion chamber of the internal combustion engine into an enclosure adjacent the combustion chamber;

directing the air/fuel mixture received into the enclosure toward a first and second ignition bodies and to circulate in the enclosure and to recombine with the incoming air/fuel mixture flow orthogonally to or generally in the direction of the incoming air/fuel mixture flow;

igniting the air/fuel mixture in a flame kernel initiation gap between the first and second ignition bodies.

12. The method of claim 11, where the enclosure is an outer enclosure and directing the air/fuel mixture received into the outer enclosure toward the first and second ignition bodies comprises directing the air/fuel mixture received into the outer enclosure to impinge on an inner enclosure within the outer enclosure;

and

comprising receiving the air/fuel mixture impinging on the inner enclosure into the inner enclosure and directing the air/fuel mixture received into the inner enclosure into the flame kernel initiation gap.

13. The method of claim 12, where directing the air/fuel mixture received into the outer enclosure to impinge on an inner enclosure comprises displacing combustion residuals around a passage through the inner enclosure.

14. The method of claim 12, comprising directing the air/fuel mixture directed to impinge on the inner enclosure to generate a toroidal vortex in the outer enclosure.

15. The method of claim 12, where directing the air/fuel mixture received into the inner enclosure into a flame kernel initiation gap comprises directing the air/fuel mixture with a central passage of the inner enclosure primarily into the flame kernel initiation gap;

comprising directing the air/fuel mixture received into the inner enclosure with a peripheral passage of the inner enclosure to swirl around an exterior of the second ignition body; and

comprising protecting air/fuel mixture in the flame kernel initiation gap from flow disturbances from the swirling air/fuel mixture with the second ignition body.

16. The method of claim 12, comprising:

transporting a flame kernel, formed by igniting air/fuel mixture in the flame kernel initiation gap, towards a rear of inner enclosure, away from the combustion chamber;

igniting air/fuel mixture from the rear of the inner enclosure toward a front of the inner enclosure using the flame kernel;

jetting combusting air/fuel mixture from the inner enclosure into the outer enclosure and igniting air/fuel mixture in the outer enclosure; and

jetting combusting air/fuel mixture from the outer enclosure into the combustion chamber.

17. The method of claim 12, where igniting air/fuel mixture in a flame kernel initiation gap between the first and second ignition bodies comprises causing the maximum mean pressure in the inner enclosure after ignition in the inner enclosure and before ignition in the combustion chamber times the flow area into the inner enclosure to be 1200 bar-sqmm or greater.

18. The method of claim 12, where lambda in the combustion chamber is 1.8 or greater and no auxiliary fuel is supplied to the inner enclosure.

19. An internal combustion engine, comprising:

a plug body;

a first ignition body carried by the plug body;

a second ignition body carried by the plug body adjacent the first ignition body to define a flame kernel initiation gap between the second ignition body and the second ignition body; and

an enclosure comprising a jet passage, the enclosure adapted to direct a portion of flow incoming through the jet passage to circulate in the enclosure and recombine with the incoming flow through the jet passage orthogonally to or generally in the direction of the incoming flow through the jet passage.

20. The internal combustion engine of claim 19, where the enclosure comprises an outer enclosure;

and

comprising an inner enclosure within the outer enclosure, the inner enclosure comprising a jet passage and defining an inner chamber enclosing the first ignition body and the second ignition body.

21. The internal combustion engine of claim 19, comprising a tubular receiver housing comprising the enclosure and adapted to receive and couple to the plug body.

22. The internal combustion engine of claim 20, where the jet passage of the outer enclosure comprises a central jet passage adapted to direct air/fuel mixture from a combustion chamber of the engine to impinge on the inner enclosure and displace combustion residuals from adjacent the inner enclosure.

23. The internal combustion engine of claim 22, where the jet passage of the inner enclosure comprises:

a central jet passage adapted to direct air/fuel mixture primarily into the flame kernel initiation gap; and

a peripheral jet passage adapted to direct air/fuel mixture primarily exterior to the second ignition body.