TURBULENT JET IGNITION PRE-CHAMBER COMBUSTION SYSTEM FOR SPARK IGNITION ENGINES

• US 20120103302A1
• Filed: 11/01/2011
• Published: 05/03/2012
• Est. Priority Date: 11/01/2010
• Status: Active Grant

• Current Assignee: Mahle International GmbH (MAHLE-STIFTUNG GmbH)
• Original Assignee: MAHLE Powertrain, LLC (MAHLE-STIFTUNG GmbH)
• Inventors: Attard, William
• Granted Patent: US 8,857,405 B2
• Time in Patent Office: Days
• US Class Current: 123/260
• CPC Class Codes: F02B 19/10 with fuel introduced partly into pre-combustion chamber, and partly into cylinder
• CPC Class Codes: F02B 19/1057 with fuel injectors disposed upstream of intake valves
• 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 19/12 with positive ignition engines with non-timed positive ignition, and with incandescent chambers F02B9/08
• CPC Class Codes: F02B 19/14 with compression ignition
• CPC Class Codes: F02D 41/0027 the fuel being gaseous non-electrical control F02D19/02
• 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: F02P 9/007 by supplementary electrical discharge in the pre-ionised electrode interspace of the sparking plug, e.g. plasma jet ignition
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

An ignition system for an internal combustion engine having at least one combustion chamber where the ignition system includes a housing, an ignition device, an injector, and a pre-chamber having a nozzle disposed spaced from the proximal portion of the pre-chamber. The igniter portion of the ignition device and the nozzle of the injector are operatively supported in the proximal portion of the pre-chamber and disposed flush therewith. The igniter portion ignites the fuel in pre-chamber such that partially combusted pre-chamber products are forced through orifices in the pre-chamber nozzle and extinguish, but dispersed through the combustion chamber so as to ignite the main fuel charge therein.

Claims

1. An ignition system for an internal combustion engine having at least one combustion chamber, said ignition system comprising:

a housing defined in the cylinder head of the internal combustion engine, said housing defining a pre-chamber;

an ignition device supported in said housing and having an igniter portion that substantially faces said pre-chamber;

an injector supported in said housing and having a nozzle that substantially faces said pre-chamber;

said pre-chamber defining a proximal portion and a pre-chamber nozzle disposed spaced from said proximal portion of said pre-chamber, said pre-chamber nozzle including a plurality of orifices disposed spaced from one another and providing fluid communication between said pre-chamber and the combustion chamber;

said igniter portion of said ignition device and said nozzle of said injector operatively supported in the proximal portion of the pre-chamber and disposed flush therewith such that said injector delivers a predetermined quantity of fuel into said pre-chamber, said igniter portion ignites the fuel in said pre-chamber such that the ignited fuel is forced through said orifices of said pre-chamber nozzle and extinguished, but dispersed through the combustion chamber so as to ignite the main fuel charge therein.

2. The ignition system as set forth in claim 1 wherein said pre-chamber nozzle defines a longitudinal axis, said orifices disposed about said longitudinal axis in spaced relation with respect to each other.

3. The ignition system as set forth in claim 1 wherein said housing is supported in said cylinder head and includes a substantially cylindrical portion having an annular groove disposed about said cylindrical portion, an O-ring seal operatively received in said groove and adapted for sealing engagement with said cylinder head.

4. The ignition system as set forth in claim 1 wherein said housing includes a terminal portion including external threads and internal threads, said external threads cooperating with threads formed on the cylinder head to mount said housing therein, said pre-chamber nozzle including external threads that cooperate with said internal threads on said terminal portion of said housing to mount said nozzle thereon.

5. The ignition system as set forth in claim 1 wherein said housing defines a sparkplug cavity portion and an injector cavity portion, said ignition device operatively received in said sparkplug cavity portion and said injector operatively received in said injector cavity portion.

6. The ignition system as set forth in claim 1 wherein said system includes a cooling tube providing fluid communication between a source of cooling fluid and said housing.

7. The ignition system as set forth in claim 1 wherein said system further includes a direct injection installation sleeve for stabilizing said housing in said cylinder head.

8. An internal combustion engine comprising:

an engine block including at least one cylinder, a piston supported for repeated reciprocal movement in said cylinder, and a cylinder head;

said piston, cylinder and cylinder head cooperating to define at least one combustion chamber;

said cylinder head including at least one intake port through which the main fuel air charge may flow into said combustion chamber and at least one exhaust port through which the products of combustion may exit said combustion chamber;

said internal combustion engine further including an ignition system, said ignition system including a housing operatively supported in the cylinder head of the internal combustion engine, said housing defining a pre-chamber;

an ignition device supported in said housing and having an igniter portion that substantially faces said pre-chamber;

an injector supported in said housing and having a nozzle that substantially faces said pre-chamber;

said pre-chamber defining a proximal portion and a pre-chamber nozzle disposed spaced from said proximal portion of said pre-chamber, said pre-chamber nozzle including a plurality of orifices disposed spaced from one another and providing fluid communication between said pre-chamber and the combustion chamber;

said igniter portion of said ignition device and said nozzle of said injector operatively supported in the proximal portion of the pre-chamber and disposed flush therewith such that said injector delivers a predetermined quantity of fuel into said pre-chamber, said igniter portion ignites the fuel in said pre-chamber such that the ignited fuel is forced through said orifices of said pre-chamber nozzle and extinguished, but dispersed through the combustion chamber so as to ignite the main fuel charge therein.

9. The internal combustion engine as set forth in claim 8 wherein said pre-chamber nozzle defines a longitudinal axis, said orifices disposed about said longitudinal axis in spaced relation with respect to each other.

10. The internal combustion engine as set forth in claim 8 wherein said housing is supported in said cylinder head and includes a substantially cylindrical portion having an annular groove disposed about said cylindrical portion, an O-ring seal operatively received in said groove and adapted for sealing engagement with said cylinder head.

11. The internal combustion engine as set forth in claim 8 wherein said housing includes a terminal portion including external threads and internal threads, said external threads cooperating with threads formed on the cylinder head to mount said housing therein, said pre-chamber nozzle including external threads that cooperate with said internal threads on said terminal portion of said housing to mount said nozzle thereon.

12. The internal combustion engine as set forth in claim 8 wherein said housing defines a sparkplug cavity portion and an injector cavity portion, said ignition device operatively received in said sparkplug cavity portion and said injector operatively received in said injector cavity portion.

13. The internal combustion engine as set forth in claim 8 wherein said ignition system includes a cooling tube providing fluid communication between a source of cooling fluid and said housing.

14. The internal combustion engine as set forth in claim 8 wherein said ignition system further includes a direct injection installation sleeve for stabilizing said housing in said cylinder head.