Method for controlling ignition in internal combustion engine and pre-chamber assembly thereof

Patent metadata

Field	Value
Publication number	US-9920714-B2
Application number	US-201615197027-A
Country	US
Kind code	B2
Filing date	Jun 29, 2016
Priority date	Jun 29, 2016
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

An internal combustion engine is provided. The internal combustion engine includes an engine block having at least one cylinder. The internal combustion engine includes a cylinder head engaged with the engine block. The internal combustion engine includes a pre-chamber assembly associated with the cylinder head. The pre-chamber assembly includes a pre-chamber in fluid communication with a main combustion chamber. The pre-chamber assembly includes a fuel supply unit in fluid communication with the pre-chamber to selectively supply fuel to the pre-chamber. The pre-chamber assembly includes an auxiliary unit configured to produce oxygen and hydrogen. The auxiliary unit is in fluid communication with the pre-chamber to supply oxygen to the pre-chamber and in fluid communication with the main combustion chamber to supply hydrogen to the main combustion chamber. The pre-chamber assembly includes an ignition unit associated with the pre-chamber to selectively ignite a mixture of fuel and oxygen in the pre-chamber.

First claim

What is claimed is:

1. A pre-chamber assembly for an internal combustion engine, the pre-chamber assembly comprising:
a pre-chamber in fluid communication with a main combustion chamber of the internal combustion engine;
a fuel supply unit in fluid communication with the pre-chamber, the fuel supply unit being configured to selectively supply fuel to the pre-chamber;
an auxiliary unit in fluid communication with the pre-chamber and the main combustion chamber, the auxiliary unit being configured to produce oxygen and hydrogen and to supply oxygen to the pre-chamber and supply hydrogen to the main combustion chamber; and
an ignition unit associated with the pre-chamber and configured to selectively ignite a mixture of fuel and oxygen in the pre-chamber.

2. The pre-chamber assembly of claim 1 , wherein the auxiliary unit includes an electrolysis unit configured to produce oxygen and hydrogen through electrolysis of water.

3. The pre-chamber assembly of claim 2 , wherein the auxiliary unit is in fluid communication with a water source.

4. The pre-chamber assembly of claim 3 , wherein the water source is an exhaust system.

5. The pre-chamber assembly of claim 4 , wherein the auxiliary unit receives water resulting from condensation of exhaust gases by the exhaust system.

6. The pre-chamber assembly of claim 3 , wherein the water source is an Exhaust Gas Recirculation (EGR) system.

7. The pre-chamber assembly of claim 1 , wherein the auxiliary unit includes a membrane filtration system configured to obtain oxygen and hydrogen from water.

8. An internal combustion engine comprising:
an engine block having at least one cylinder;
a cylinder head engaged with the engine block to cover the at least one cylinder and define a main combustion chamber; and
a pre-chamber assembly associated with the cylinder head, the pre-chamber assembly comprising:
a pre-chamber in fluid communication with the main combustion chamber;
a fuel supply unit in fluid communication with the pre-chamber to selectively supply fuel to the pre-chamber;
an auxiliary unit configured to produce oxygen and hydrogen, the auxiliary unit being in fluid communication with the pre-chamber to supply oxygen to the pre-chamber, and with the main combustion chamber to supply hydrogen to the main combustion chamber; and
an ignition unit associated with the pre-chamber to selectively ignite a mixture of fuel and oxygen in the pre-chamber.

9. The internal combustion engine of claim 8 , wherein the auxiliary unit includes an electrolysis unit configured to produce oxygen and hydrogen through electrolysis of water.

10. The internal combustion engine of claim 8 , wherein the auxiliary unit is in fluid communication with a water source.

11. The internal combustion engine of claim 10 , wherein the water source is an exhaust system, the auxiliary unit receives water resulting from condensation of exhaust gases by the exhaust system.

12. The internal combustion engine of claim 10 , wherein the auxiliary unit is in fluid communication with an Exhaust Gas Recirculation (EGR) system to receive water from the Exhaust Gas Recirculation (EGR) system.

13. The internal combustion engine of claim 10 , wherein the auxiliary unit includes a membrane filtration system configured to obtain oxygen and hydrogen from water.

14. A method of operating an internal combustion engine, the method comprising:
producing oxygen and hydrogen from water;
supplying oxygen to a pre-chamber of the internal combustion engine;
supplying hydrogen to a main combustion chamber of the internal combustion engine;
supplying fuel to the pre-chamber of the internal combustion engine;
forming a mixture of fuel and oxygen in the pre-chamber; and
igniting the mixture of fuel and oxygen in the pre-chamber.

15. The method of claim 14 further comprising, obtaining oxygen and hydrogen from the water via electrolysis of water.

16. The method of claim 14 further comprising, separating oxygen and hydrogen from the water via membrane filtration.

17. The method of claim 14 further comprising, receiving water from an exhaust system for producing oxygen and hydrogen.

18. The method of claim 14 further comprising, receiving water from an Exhaust Gas Recirculation (EGR) system for producing oxygen and hydrogen.

Assignees

• Caterpillar Inc

Inventors

• Ginter David M
• Wang Sai Keat Paul
• Kim Charlie C
• Kim Arnold M
• Van Alstine Daniel G

Classifications

• F02M26/35

  with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters · CPC title

• F02M27/04

  by electric means, {ionisation, polarisation} or magnetism · CPC title

• F02M25/03 Primary

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

• F02B19/12 Primary

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

• Y02T10/12

  Improving ICE efficiencies · CPC title