Charge-fed pre-chamber assembly

Patent metadata

Field	Value
Publication number	US-10598079-B2
Application number	US-201615759345-A
Country	US
Kind code	B2
Filing date	Apr 11, 2016
Priority date	Nov 11, 2015
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

A method for combustion in a combustion chamber of an internal combustion engine includes mixing fuel and air to form a charge, flowing a first portion of the charge to the main chamber of an engine and a second portion of the charge to the pre-chamber volume of an engine, igniting the second portion of the charge in the pre-chamber volume, and delivering the ignited second portion of the charge to the main chamber.

First claim

What is claimed is:

1. A method for combustion in a combustion chamber of an internal combustion engine, comprising:
mixing fuel and air to form a charge;
flowing a first portion of the charge to a main chamber of the engine;
bypassing the main chamber to flow a second portion of the charge to a pre-chamber volume of the engine;
igniting the second portion of the charge in the pre-chamber volume; and
delivering the ignited second portion of the charge to the main chamber.

2. The method of claim 1 , further comprising supplying the second portion of the charge to the pre-chamber volume when a pressure of the pre-chamber volume is less than a pressure of the charge.

3. The method of claim 2 , further comprising inhibiting the flow of the second portion of the charge into the pre-chamber volume when the pressure of the pre-chamber volume is greater than the pressure of the charge.

4. The method of claim 1 , further comprising displacing residual gases in the pre-chamber volume with the second portion of the charge.

5. The method of claim 1 , wherein flowing the first portion of the charge to the main chamber and the second portion of the charge to the pre-chamber volume includes decreasing a temperature of the charge and diverting the second portion of the charge to a pre-chamber passage.

6. The method of claim 5 , wherein decreasing the temperature of the charge includes flowing the charge through an aftercooler.

7. The method of claim 1 , wherein flowing the first portion of the charge to the main chamber includes decreasing a pressure of the first portion of the charge, and flowing the first portion of the charge into an intake manifold of the internal combustion engine.

8. The method of claim 7 , wherein decreasing the pressure of the first portion of the charge includes flowing the first portion of the charge through a throttle valve.

9. The method of claim 1 , wherein flowing the first portion of the charge to the main chamber and the second portion of the charge to the pre-chamber volume includes flowing 0.25-5.0% of a total volume of the charge to the pre-chamber volume and flowing 95.0-99.75% of the total volume of the charge to the main chamber.

10. An apparatus, comprising:
at least one cylinder including a main chamber and a pre-chamber fluidly coupled to the main chamber; and
a pre-chamber conduit fluidly coupled to the main chamber and the pre-chamber, the pre-chamber conduit being configured to directly deliver a portion of a mixture of air and fuel to the pre-chamber.

11. The apparatus of claim 10 , further comprising an ignition device operably coupled to the pre-chamber and configured to ignite the mixture of air and fuel in the pre-chamber.

12. The apparatus of claim 10 , wherein a volume of the pre-chamber is up to 5% of a clearance volume of the main chamber.

13. The apparatus of claim 10 , wherein the apparatus defines an internal combustion engine.

14. An internal combustion engine, comprising:
at least one cylinder having a main combustion chamber and a pre-chamber spaced apart from the main combustion chamber;
an intake manifold fluidly coupled to the main combustion chamber;
an inlet fluidly coupled to the intake manifold and configured to receive fuel and air to define a charge;
a cooling device operably coupled to the inlet and the intake manifold;
a main chamber conduit extending between the cooling device and the intake manifold and configured to provide a first portion of the charge to the main combustion chamber; and
a pre-chamber conduit fluidly coupled to the main chamber conduit and extending between the main chamber conduit and the pre-chamber, the pre-chamber conduit being configured to provide a second portion of the charge to the pre-chamber.

15. The internal combustion engine of claim 14 , wherein a pressure of the first portion of the charge is less than a pressure of the second portion of the charge.

16. The internal combustion engine of claim 15 , further comprising a fuel assembly configured to supply a gaseous fuel to the main chamber and the pre-chamber conduit.

17. The internal combustion engine of claim 14 , wherein a fuel:air ratio of the first portion of the charge in the main combustion chamber is substantially identical to a fuel:air ratio of the second portion of the charge in the pre-chamber.

18. The internal combustion engine of claim 14 , wherein an amount of fuel comprising the second portion of the charge remains constant when the second portion of the charge is in the pre-chamber conduit and is in the pre-chamber.

19. The internal combustion engine of claim 14 , further comprising a throttle valve operably coupled to the main chamber conduit.

20. The method of claim 1 , wherein bypassing the main chamber includes directly flowing the second portion of the charge to the pre-chamber volume.

21. The method of claim 1 , wherein bypassing the main chamber to flow the second portion of the charge to the pre-chamber volume occurs with or before flowing the first portion of the charge to the main chamber of the engine.

22. The apparatus of claim 10 , wherein the pre-chamber conduit is configured to directly deliver the portion of the mixture of air and fuel to the pre-chamber independent of any air or fuel within the main chamber.

23. A method for combustion in a combustion chamber of an internal combustion engine, comprising:
mixing fuel and air to form a charge;
flowing a first portion of the charge to a main chamber of the engine;
bypassing the main chamber to flow a second portion of the charge to a pre-chamber volume of the engine;
igniting the second portion of the charge in the pre-chamber volume; and
delivering the ignited second portion of the charge to the main chamber,
wherein flowing the first portion of the charge to the main chamber and the second portion of the charge to the pre-chamber volume includes flowing 0.25-5.0% of a total volume of the charge to the pre-chamber volume and flowing 95.0-99.75% of the total volume of the charge to the main chamber.

Assignees

• Cummins Inc

Inventors

• Anderson Alan C

Classifications

• F02B19/108 Primary

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

• F02B19/14

  with compression ignition · CPC title

• F02M21/0269

  Outwardly opening valves, e.g. poppet valves · CPC title

• F02B19/12

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

• F02B19/00

  Engines characterised by precombustion chambers · CPC title