Method of operating a combustion engine provided with at least one flushed prechamber

Patent metadata

Field	Value
Publication number	US-9644527-B2
Application number	US-201313771540-A
Country	US
Kind code	B2
Filing date	Feb 20, 2013
Priority date	Feb 21, 2012
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

A method of operating a combustion engine provided with at least one flushed prechamber, and the at least one prechamber is connected to a main combustion chamber of the combustion engine. During a compression phase immediately preceding the ignition in the main combustion chamber—after ignition has taken place in the prechamber, in a first transfer phase, gas transfers from the prechamber into the main combustion chamber. After the first transfer phase, an at least two-phase, incompressible medium—preferably water—is introduced into the prechamber.

First claim

The invention claimed is:

1. A method of operating a combustion engine having at least one flushed prechamber connected to a main combustion chamber of the combustion engine, the prechamber being connected to the main combustion chamber via a transfer channel, said method comprising:
after ignition has taken place in the prechamber and during a compression phase immediately preceding ignition in the main combustion chamber, transferring gas from the prechamber into the main combustion chamber in a first transfer phase; and
after the first transfer phase, introducing an at least two-phase incompressible medium into the transfer channel between the prechamber and the main combustion chamber via at least one injection channel opening into the transfer channel.

2. The method according to claim 1 , wherein the medium is water.

3. The method according to claim 1 , wherein backflowing gas flows back from the main combustion chamber into the prechamber in at least one second transfer phase, further comprising introducing the medium for a period of time during the at least one second transfer phase.

4. The method according to claim 1 , wherein said introducing the medium comprises introducing the medium during a period of time when a crankshaft is in a range of crankshaft angle from about 15 degrees of crankshaft angle before a top dead center of a piston delimiting the main combustion chamber to about 10 degrees of crankshaft angle after the top dead center of the piston delimiting the main combustion chamber.

5. The method according to claim 1 , wherein the medium is introduced at a pressure of at least 100 bar.

6. The method according to claim 5 , wherein the medium is introduced at a pressure of about 200 bar.

7. A method of operating a combustion engine having at least one flushed prechamber connected to a main combustion chamber of the combustion engine, the prechamber being connected to the main combustion chamber via a transfer channel, said method comprising:
after ignition has taken place in the prechamber and during a compression phase immediately preceding ignition in the main combustion chamber, transferring gas from the prechamber into the main combustion chamber in a first transfer phase; and
after the first transfer phase, introducing an at least two-phase, incompressible medium into the prechamber at a pressure of at least 100 bar, said introducing the medium comprising introducing the medium into the prechamber before a maximum pressure p max is reached in the main combustion chamber.

8. The method according to claim 7 , wherein the medium is water.

9. The method according to claim 7 , wherein said introducing the medium comprises injecting the medium into the prechamber.

10. The method according to claim 7 , wherein backflowing gas flows back from the main combustion chamber into the prechamber in at least one second transfer phase, further comprising introducing the medium for a period of time during the at least one second transfer phase.

11. The method according to claim 7 , wherein said introducing the medium comprises introducing the medium during a period of time when a crankshaft is in a range of crankshaft angle from about 15 degrees of crankshaft angle before a top dead center of a piston delimiting the main combustion chamber to about 10 degrees of crankshaft angle after the top dead center of the piston delimiting the main combustion chamber.

12. The method according to claim 7 , wherein said introducing the medium comprises introducing the medium at a pressure of about 200 bar.

13. A method of operating a combustion engine having at least one flushed prechamber connected to a main combustion chamber of the combustion engine, the prechamber being connected to the main combustion chamber via a transfer channel, said method comprising:
after ignition has taken place in the prechamber and during a compression phase immediately preceding ignition in the main combustion chamber, transferring gas from the prechamber into the main combustion chamber in a first transfer phase; and
after the first transfer phase, introducing an at least two-phase, incompressible medium into the prechamber at a pressure of at least 100 bar;
wherein backflowing gas flows back from the main combustion chamber into the prechamber in at least one second transfer phase, further comprising introducing the medium for a period of time during the at least one second transfer phase.

14. The method according to claim 13 , wherein the medium is water.

15. The method according to claim 13 , wherein said introducing the medium comprises injecting the medium into the prechamber.

16. The method according to claim 13 , wherein said introducing the medium comprises introducing the medium during a period of time when a crankshaft is in a range of crankshaft angle from about 15 degrees of crankshaft angle before a top dead center of a piston delimiting the main combustion chamber to about 10 degrees of crankshaft angle after the top dead center of the piston delimiting the main combustion chamber.

17. The method according to claim 13 , wherein said introducing the medium comprises introducing the medium at a pressure of about 200 bar.

Assignees

• Ge Jenbacher Gmbh & Co Og

Inventors

• Schaumberger Herbert
• Winter Hubert
• Fimml Wolfgang

Classifications

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F02M25/03

  into the cylinder {or the pre-combustion chamber} · CPC title

• F02B19/12

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

• Y02T10/125

  Cross-Sectional Technologies · mapped topic

• F02B17/005 Primary

  having direct injection in the combustion chamber · CPC title