Internal combustion engine, in particular for a motor vehicle, and a method for operating such an internal combustion engine

Patent metadata

Field	Value
Publication number	US-9605585-B2
Application number	US-201314378416-A
Country	US
Kind code	B2
Filing date	Feb 14, 2013
Priority date	Feb 14, 2012
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A motor vehicle internal combustion engine has at least one combustion chamber delimited by at least one wall of the internal combustion engine, and at least one injector that is associated with the combustion chamber and that is at least partially accommodated in a receiving opening delimited by a first wall area of the wall extending at least essentially parallel to the axial direction of the injector The injector includes at least one injection opening that opens into the combustion chamber via the receiving opening, in the direction of the combustion chamber the first wall area being directly adjoined by a further wall area of the wall that extends at an angle to the axial direction and which delimits an at least essentially conical area of the receiving opening which expands toward the combustion chamber. Over its length relative to the radial direction of the injector, the further wall area is situated at a distance from the injector and in alignment with the injector, at least in places, and has a cone opening angle in a range of 50 degrees up to and including 90 degrees, the cone opening angle being smaller than a jet angle of the injection jet.

First claim

The invention claimed is:

1. A motor vehicle internal combustion engine, comprising:
a combustion chamber delimited by a wall of the internal combustion engine; and
an injector associated with the combustion chamber,
wherein the injector is at least partially accommodated in a receiving opening delimited by a first wall area of the wall extending at least essentially parallel to an axial direction of the injector,
wherein the injector has at least one injection opening that opens into the combustion chamber via the receiving opening,
wherein in a direction of the combustion chamber the first wall area is directly adjoined by a further wall area of the wall that extends at an angle to the axial direction and which delimits an at least essentially conical area of the receiving opening expanding toward the combustion chamber,
wherein the injector is configured to introduce a conical injection jet of fuel for the internal combustion engine into the combustion chamber unimpeded by the further wall area,
wherein over a length of the further wall relative to a radial direction of the injector, the further wall area is situated at a distance from the injector and has a cone opening angle in a range of 50 degrees up to and including 90 degrees, the cone opening angle being smaller than a jet angle of the injection jet.

2. The internal combustion engine of claim 1 , wherein the further wall area extends over a length, relative to the axial direction of the injector, which is in a range of 3 millimeters up to and including 6 millimeters.

3. The internal combustion engine of claim 1 , wherein the first wall area rests against the injector.

4. The internal combustion engine of claim 1 , wherein a minimum distance between the further wall area and the injection jet brought about by the injector for injecting fuel for the internal combustion engine into the combustion chamber is in a range of 1 millimeter up to and including 4 millimeters.

5. The internal combustion engine of claim 1 , wherein the internal combustion engine is a gasoline engine.

6. The internal combustion engine of claim 1 , wherein a stratified charge operation or a homogeneous operation of the internal combustion engine is performed by means of the injector.

7. The internal combustion engine of claim 1 , wherein a lateral surface of the injector on an outer peripheral side, which is a straight circular cylinder, and the first wall area facing the combustion chamber end at a same height.

8. The internal combustion engine of claim 1 , wherein the injector is an outwardly opening or inwardly opening injector.

9. The internal combustion engine of claim 1 , wherein the further wall area is rotationally symmetrical with respect to a center axis of the injector.

10. The internal combustion engine of claim 1 , wherein a distal-most portion of the injector extends beyond the first wall area of the wall in the direction of the combustion chamber.

11. A method for operating a motor vehicle internal combustion engine, comprising a combustion chamber delimited by a wall of the internal combustion engine and an injector associated with the combustion chamber, wherein the injector is at least partially accommodated in a receiving opening delimited by a first wall area of the wall extending at least essentially parallel to an axial direction of the injector, wherein the injector has at least one injection opening that opens into the combustion chamber via the receiving opening, wherein in a direction of the combustion chamber the first wall area is directly adjoined by a further wall area of the wall that extends at an angle to the axial direction and which delimits an at least essentially conical area of the receiving opening expanding toward the combustion chamber, wherein the injector is configured to introduce a conical injection jet of fuel for the internal combustion engine into the combustion chamber unimpeded by the further wall area, wherein over a length of the further wall relative to a radial direction of the injector, the further wall area is situated at a distance from the injector and has a cone opening angle in a range of 50 degrees up to and including 90 degrees, the cone opening angle being smaller than a jet angle of the injection jet;
comprising the step of operating the internal combustion engine in a stratified charge operation by means of the injector.

12. The method of claim 11 , wherein a distal-most portion of the injector extends beyond the first wall area of the wall in the direction of the combustion chamber.

Assignees

• Daimler Ag

Inventors

• Bezner Martin
• Fischer Juergen
• Gildein Helmut
• Kaden Arnold
• Sundheim Dirk

Classifications

• F02B23/101

  the injector being placed on or close to the cylinder centre axis, e.g. with mixture formation using spray guided concepts · CPC title

• F02B17/005 Primary

  having direct injection in the combustion chamber · CPC title

• Y02T10/125

  Cross-Sectional Technologies · mapped topic

• Y02T10/12

  Improving ICE efficiencies · CPC title