Multi-chamber igniter

Patent metadata

Field	Value
Publication number	US-9765682-B2
Application number	US-201414458947-A
Country	US
Kind code	B2
Filing date	Aug 13, 2014
Priority date	Jun 10, 2013
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

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.

First claim

We claim:

1. A system for igniting a mixture in an internal combustion engine, the system comprising:
an ignition plug comprising an igniter; and
an enclosure comprising a plug receptacle that receives the ignition plug and an engine coolant passage around the plug receptacle, the enclosure defining an outer chamber about an end of the ignition plug that is larger in volume than a fluid containing interior chamber enclosing the igniter, the outer chamber comprising a jet passage between an interior and an exterior of the enclosure, the outer chamber curved to direct flow incoming through the jet passage to circulate in the outer chamber and recombine with the incoming flow,
wherein the enclosure comprises a first part comprising the jet passage and the outer chamber and a second part coupled to the first part defining the plug receptacle, and
wherein the second part contacts the first part only at opposing ends of the engine coolant passage.

2. The system of claim 1 , wherein an end of the plug receptacle is open to the outer chamber, and wherein the engine coolant passage is outside of the plug receptacle and adjacent a sidewall of the interior chamber.

3. The system of claim 1 , wherein enclosure comprises an end cap defining the jet passage, and
wherein the jet passage comprises a central passage and a plurality of diverging side passages between the outer chamber and a combustion chamber of the engine.

4. The system of claim 3 , wherein the side passages are straight.

5. A system for igniting a mixture in an internal combustion engine, the system comprising:
an ignition plug comprising an igniter; and
an enclosure comprising a plug receptacle that receives the ignition plug and an engine coolant passage around the plug receptacle, the enclosure defining an outer chamber about an end of the ignition plug that is larger in volume than a fluid containing interior chamber enclosing the igniter, the outer chamber comprising a jet passage between an interior and an exterior of the enclosure, the outer chamber curved to direct flow incoming through the jet passage to circulate in the outer chamber and recombine with the incoming flow,
wherein enclosure comprises an end cap defining the jet passage,
wherein the jet passage comprises a central passage and a plurality of diverging side passages between the outer chamber and a combustion chamber of the engine, and
wherein the plurality of side passages comprises a first set of side passages having a first minimum diameter and a second set of side passages having a second minimum diameter that is larger than the first minimum diameter.

6. The system of claim 3 , wherein the end cap comprises a first sub-part defining the central passage and a second sub-part defining the side passages, and where the central passage is straight.

7. A system for igniting a mixture in an internal combustion engine, the system comprising:
an ignition plug comprising an igniter; and
an enclosure comprising a plug receptacle that receives the ignition plug and an engine coolant passage around the plug receptacle, the enclosure defining an outer chamber about an end of the ignition plug that is larger in volume than a fluid containing interior chamber enclosing the igniter, the outer chamber comprising a jet passage between an interior and an exterior of the enclosure, the outer chamber curved to direct flow incoming through the jet passage to circulate in the outer chamber and recombine with the incoming flow,
wherein the enclosure comprises a first part comprising the jet passage and the outer chamber and a second part coupled to the first part defining the plug receptacle, and
wherein the first part is made substantially of a first material and the second part is made substantially of a second material, the first material having a lower thermal conductivity than the second material.

8. The system of claim 1 , wherein a sidewall surface of the outer chamber is thermal barrier coated.

9. The system of claim 1 , wherein the enclosure defines an engine coolant inlet adapted to communicate engine coolant with an engine coolant passage of the internal combustion engine when the enclosure is coupled to the internal combustion engine.

10. The system of claim 1 , wherein outer chamber is curved to recombine circulating flow in the outer chamber with the incoming flow from the jet passage, adjacent to the jet passage and orthogonally to or in the general direction of the incoming flow.

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 a portion of the air/fuel mixture received in the enclosure toward an ignition gap between first and second ignition bodies and another portion of the air/fuel mixture to circulate in the enclosure and recombine with the incoming air/fuel mixture;
igniting the air/fuel mixture in the ignition gap;
communicating engine coolant through an engine coolant passage in the enclosure, cooling the first and second ignition bodies; and
jetting flames from the enclosure into the combustion chamber through a first set of side passages having a first minimum diameter and through a second set of side passages having a second minimum diameter that is larger than the first diameter.

12. The method of claim 11 , comprising jetting flames through the second set of side passages to travel further into the combustion chamber than flames jetted through the first set of side passages.

13. 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 ignition gap.

14. The method of claim 11 , comprising communicating engine coolant with the engine coolant passage of the internal combustion engine when a tubular receiver housing is coupled to the internal combustion engine, the tubular receiver housing comprising the enclosure and adapted to couple to the internal combustion engine.

15. An internal combustion engine, comprising:
an ignition plug comprising an igniter;
an enclosure receiving the ignition plug, the enclosure comprising:
a first part comprising a jet passage and defining a chamber, the chamber adapted to direct flow incoming through the jet passage to circulate in the chamber and recombine with the incoming flow; and
a second part coupled to the first part defining a plug receptacle that receives the ignition plug and defining an engine coolant passage apart from the chamber,

wherein the first part is made substantially of a first material and the second part is made substantially of a second material, the first material having a lower thermal conductivity than the second material.

16. The system of claim 1 , wherein the engine coolant passage is annular and extends circumferentially around the plug receptacle, axially coinciding with the igniter.

17. The system of claim 1 , wherein the enclosure comprises a first part comprising the jet passage and the outer chamber and a second part coupled to the first part defining the plug receptacle.

Assignees

• Woodward Inc

Inventors

• Chiera Domenico
• Hampson Gregory James

Classifications

• F02B19/1095

  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 title

• H01T13/54

  having electrodes arranged in a partly-enclosed ignition chamber · CPC title

• F02B19/12

  with positive ignition (engines with non-timed positive ignition, and with incandescent chambers F02B9/08) · CPC title

• F02P9/007

  by supplementary electrical discharge in the pre-ionised electrode interspace of the sparking plug, e.g. plasma jet ignition · CPC title

• F02B19/108

  with fuel injection at least into pre-combustion chamber, i.e. injector mounted directly in the pre-combustion chamber · CPC title