Internal combustion engine and method for operating an internal combustion engine

Patent metadata

Field	Value
Publication number	US-10287969-B2
Application number	US-201615563431-A
Country	US
Kind code	B2
Filing date	Mar 22, 2016
Priority date	Apr 2, 2015
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

An internal combustion engine including at least one combustion chamber having a main chamber and a prechamber, wherein the prechamber is in fluid connection with the main chamber via at least one bore. The at least one combustion chamber is connected to a charging path for the supply of a combustion air-fuel mixture into the combustion chamber via the charging path. A fuel intermixing region is arranged in a section of the charging path separately assigned to the combustion chamber, which fuel intermixing region is in fluid connection with the charging path on one side and with a fuel line on the other side for the supply of fuel into the fuel intermixing region via a controllable fuel valve. The internal combustion engine wherein the prechamber and the fuel intermixing region are in fluid connection with one another via a check valve.

First claim

The invention claimed is:

1. An internal combustion engine, comprising:
at least one combustion chamber having a main chamber and a prechamber, wherein the prechamber is fluidically connected to the main chamber via at least one bore;
a charging path connected to the at least one combustion chamber for delivering a combustion air-fuel mixture through the charging path into the combustion chamber;
a fuel mixing chamber disposed in a segment of the charging path and separately associated with the combustion chamber, the fuel mixing chamber being fluidically connected to the charging path and fluidically connected to a fuel line for delivering fuel into the fuel mixing chamber via an actuatable fuel valve; and a non-return valve that fluidically connects the prechamber and the fuel mixing chamber to each other.

2. The internal combustion engine according to claim 1 , further comprising a connecting path that opens in the fuel mixing chamber at a first end of two ends and opens in the prechamber at a second end of the two ends, wherein the non-return valve is disposed in the connecting path.

3. The internal combustion engine according to claim 1 , further comprising at least one variably actuatable inlet valve fluidically connects the combustion chamber to the charging path.

4. The internal combustion engine according to claim 1 , wherein the actuatable fuel valve is as a dispensing valve for multi-point injection.

5. The internal combustion engine according to claim 2 , wherein the fuel line opens in the connecting path.

6. The internal combustion engine according to claim 1 , wherein the internal combustion engine is a gas engine.

7. The internal combustion engine according to claim 6 , wherein the internal combustion engine is a lean burn gas engine.

8. A method for operating an internal combustion engine, comprising the steps of:
delivering a combustion air-fuel mixture in an induction stroke to at least one combustion chamber that is divided into a main chamber and a prechamber via a charging path;
providing the combustion air-fuel mixture in a segment of the charging path that is separately associated with the combustion chamber by delivering fuel into a fuel mixing chamber that is disposed in the separate segment through a fuel line via an actuatable fuel valve; and
directly diverting fuel from the fuel mixing chamber into the prechamber if pressure in the prechamber is less than pressure in the fuel mixing chamber.

9. The method according to claim 8 , including directly feeding fuel from the fuel mixing chamber into the prechamber when a pressure difference between the pressure in the fuel mixing chamber and the pressure in the prechamber exceeds a specified value.

10. The method according to claim 8 , including actuating an inlet valve that connects the main chamber to the charging path using Miller control timing.

11. The method according to claim 8 , including operating the internal combustion engine with gas as a fuel.

Assignees

• Mtu Friedrichshafen Gmbh
• Mtu Friedrichshaffen Gmbh

Inventors

• Boyde Jan
• Gorse Philippe
• Prunnbauer Jan Gerrit
• Schwarte Joachim

Classifications

• F02M21/0275

  for in-cylinder direct injection, e.g. injector combined with spark plug · CPC title

• F02B19/1019

  with only one pre-combustion chamber (F02B19/1004 take precedence) · CPC title

• F02B19/1085 Primary

  controlling fuel injection · CPC title

• F02M21/0278

  Port fuel injectors for single or multipoint injection into the air intake system · CPC title

• F02B19/10

  with fuel introduced partly into pre-combustion chamber, and partly into cylinder · CPC title