Compression-ignition direct-injection combustion engine and fuel injection method for same

Patent metadata

Field	Value
Publication number	US-2016265418-A1
Application number	US-201415031393-A
Country	US
Kind code	A1
Filing date	Sep 17, 2014
Priority date	Oct 25, 2013
Publication date	Sep 15, 2016
Grant date	—

Abstract

The present invention is a compression-ignition direct-injection internal-combustion engine comprising at least a cylinder ( 10 ), a cylinder head ( 12 ) carrying fuel injection means ( 14 ), a piston ( 16 ) sliding in this cylinder, a combustion chamber ( 34 ) having on one side an upper face ( 44 ) of the piston comprising a projection ( 48 ) extending in the direction of the cylinder head and located at the center of a concave bowl ( 46 ). The engine comprises an injector projecting fuel in at least two fuel jet sheets with sheet projection angles (A 1, A 2 ), a lower sheet ( 36 ) of jet axis C 1 and an upper sheet ( 38 ) of jet axis C 2, at least two mixing zones (Z 1, Z 2 ) of the combustion chamber. According to the invention, one of the zones comprises a toroidal volume ( 64 ) of center B into which fuel jets ( 40 ) of the lower jet are injected in such a way that axis C 1 of the lower jet is contained between center B and projection ( 48 ).

First claim

1 - 7 . (canceled)

8 . A compression-ignition direct-injection internal-combustion engine comprising:
at least one cylinder, a cylinder head carrying fuel injection means, a piston sliding in the at least one cylinder, a combustion chamber defined on one side by upper face of the piston comprising a projection extending in a direction of the at least one cylinder head and arranged at a center of a concave bowl, the injection means projecting fuel as lower and upper fuel jet sheets at different sheet angles along a lower sheet first jet axis and an upper sheet second jet axis, at least two mixing zones in the combustion chamber, wherein one of the zones comprises a toroidal volume having a center into which fuel jets of the lower sheet are injected so that axis of the lower sheet jets is contained between the center and the projection.

9 . An internal-combustion engine as claimed in claim 8 , wherein the first and second fuel jet sheets are located axially above one another.

10 . An internal-combustion engine as claimed in claim 8 , wherein the injection means comprise at least two injectors projecting fuel in fuel jet sheets at different sheet angles.

11 . An internal-combustion engine as claimed in claim 9 , wherein the injection means comprise at least two injectors projecting fuel in fuel jet sheets at different sheet angles.

12 . An internal-combustion engine as claimed in claim 8 , wherein a sheet angle of one of the sheets is at most 130° and a sheet angle of the other sheet is at least 130°.

13 . An internal-combustion engine as claimed in claim 9 , wherein a sheet angle of one of the sheets is at most 130° and a sheet angle of the other sheet is at least 130°.

14 . An internal-combustion engine as claimed in claim 10 , wherein a sheet angle of one of the sheets is at most 130° and a sheet angle of the other sheet is at least 130°.

15 . An internal-combustion engine as claimed in claim 11 , wherein sheet angle of one ( 24 ) of the sheets is at most 130° whereas sheet angle of the other sheet is at least 130°.

16 . An internal-combustion engine as claimed in claim 8 , wherein the bowl comprises a toroidal volume of radii R 1 and R 2 , a bowl bottom diameter FD, a bowl opening diameter BD, a neck diameter GD, an upper injection diameter ID 1 , a developed length of a diametral section 2*Cb of the bowl, a projection height H and a bowl height L, wherein the dimensions of the bowl meet at least one condition:
ratio BD/L is less than 6,
ratio FD/BD is less than 1,
ratio 2*Cb/BD is less than 2,
ratio GD/BD ranges between 0.7 and 1,
ratio H/L is greater than 50%,
ratio R 2 /R 1 is less than 1,
ratio ID 1 /GD is greater than 1,
ID 1 is less than (GD+(2*Cb−GD)*2/3).

17 . An internal-combustion engine as claimed in claim 9 , wherein the bowl comprises a toroidal volume of radii R 1 and R 2 , a bowl bottom diameter FD, a bowl opening diameter BD, a neck diameter GD, an upper injection diameter ID 1 , a developed length of a diametral section 2*Cb of the bowl, a projection height H and a bowl height L, wherein the dimensions of the bowl meet at least one condition:
ratio BD/L is less than 6,
ratio FD/BD is less than 1,
ratio 2*Cb/BD is less than 2,
ratio GD/BD ranges between 0.7 and 1,
ratio H/L is greater than 50%,
ratio R 2 /R 1 is less than 1,
ratio ID 1 /GD is greater than 1,
ID 1 is less than (GD+(2*Cb−GD)*2/3).

18 . An internal-combustion engine as claimed in claim 10 , wherein the bowl comprises a toroidal volume of radii R 1 and R 2 , a bowl bottom diameter FD, a bowl opening diameter BD, a neck diameter GD, an upper injection diameter ID 1 , a developed length of a diametral section 2*Cb of the bowl, a projection height H and a bowl height L, wherein the dimensions of the bowl meet at least one condition:
ratio BD/L is less than 6,
ratio FD/BD is less than 1,
ratio 2*Cb/BD is less than 2,
ratio GD/BD ranges between 0.7 and 1,
ratio H/L is greater than 50%,
ratio R 2 / R 1 is less than 1,
ratio ID 1 /GD is greater than 1,
ID 1 is less than (GD+(2*Cb−GD)*2/3).

19 . An internal-combustion engine as claimed in claim 11 , wherein the bowl comprises a toroidal volume of radii R 1 and R 2 , a bowl bottom diameter FD, a bowl opening diameter BD, a neck diameter GD, an upper injection diameter ID 1 , a developed length of a diametral section 2*Cb of the bowl, a projection height H and a bowl height L, wherein the dimensions of the bowl meet at least one condition:
ratio BD/L is less than 6,
ratio FD/BD is less than 1,
ratio 2*Cb/BD is less than 2,
ratio GD/BD ranges between 0.7 and 1,
ratio H/L is greater than 50%,
ratio R 2 / R 1 is less than 1,
ratio ID 1 /GD is greater than 1,
ID 1 is less than (GD+(2*Cb−GD)*2/3).

20 . An internal-combustion engine as claimed in claim 12 , wherein the bowl comprises a toroidal volume of radii R 1 and R 2 , a bowl bottom diameter FD, a bowl opening diameter BD, a neck diameter GD, an upper injection diameter ID 1 , a developed length of a diametral section 2*Cb of the bowl, a projection height H and a bowl height L, wherein the dimensions of the bowl meet at least one condition:
ratio BD/L is less than 6,
ratio FD/BD is less than 1,
ratio 2*Cb/BD is less than 2,
ratio GD/BD ranges between 0.7 and 1,
ratio H/L is greater than 50%,
ratio R 2 /R 1 is less than 1,
ratio ID 1 /GD is greater than 1,
ID 1 is less than (GD+(2*Cb−GD)*2/3).

21 . An internal-combustion engine as claimed in claim 13 , wherein the bowl comprises a toroidal volume of radii R 1 and R 2 , a bowl bottom diameter FD, a bowl opening diameter BD, a neck diameter GD, an upper injection diameter ID 1 , a developed length of a diametral section 2*Cb of the bowl, a projection height H and a bowl height L, wherein the dimensions of the bowl meet at least one condition:
ratio BD/L is less than 6,
ratio FD/BD is less than 1,
ratio 2*Cb/BD is less than 2,
ratio GD/BD ranges between 0.7 and 1,
ratio H/L is greater than 50%,
ratio R 2 /R 1 is less than 1,
ratio ID 1 /GD is greater than 1,
ID 1 is less than (GD+(2*Cb−GD)*2/3).

22 . An internal-combustion engine as claimed in claim 14 , wherein the bowl comprises a toroidal volume of radii R 1 and R 2 , a bowl bottom diameter FD, a bowl opening diameter BD, a neck diameter GD, an upper injection diameter ID 1 , a developed length of a diametral section 2*Cb of the bowl, a projection height H and a bowl height L, wherein the dimensions of the bowl meet at least one condition:
ratio BD/L is less than 6,
ratio FD/BD is less than 1,
ratio 2*Cb/BD is less than 2,
ratio GD/BD ranges between 0.7 and 1,
ratio H/L is greater than 50%,
ratio R 2 / R 1 is less than 1,
ratio ID 1 /GD is greater than 1,
ID 1 is less than (GD+(2*Cb−GD)*2/3).

23 . An internal-combustion engine as claimed in claim 15 , wherein the bowl comprises a toroidal volume of radii R 1 and R 2 , a bowl bottom diameter FD, a bowl opening diameter BD, a neck diameter GD, an upper injection diameter ID 1 , a developed length of a diametral section 2*Cb of the bowl, a projection height H and a bowl height L, wherein the dimensions of the bowl meet at least one condition:
ratio BD/L is less than 6,
ratio FD/BD is less than 1,
ratio 2*Cb/BD is less than 2,
ratio GD/BD ranges between 0.7 and 1,
ratio H/L is greater than 50%,
ratio R 2 / R 1 is less than 1,
ratio ID 1 /GD is greater than 1,
ID 1 is less than (GD+(2*Cb−GD)*2/3).

24 . An internal combustion engine as claimed in claim 16 , wherein ratio BD/L is less than 4, ra

Assignees

• Ifp Energies Now

Inventors

• Martinez Alvarado Luis Enrique
• Richard Stephane
• Laget Olivier

Classifications

• F02B23/0693

  the combustion space consisting of step-wise widened multiple zones of different depth · CPC title

• F02M61/182

  Discharge orifices being situated in different transversal planes with respect to valve member direction of movement · CPC title

• F02B23/0651 Primary

  the fuel spray impinging on reflecting surfaces or being specially guided throughout the combustion space · CPC title

• F02M61/1813

  Discharge orifices having different orientations with respect to valve member direction of movement, e.g. orientations being such that fuel jets emerging from discharge orifices collide with each other · CPC title

• F02B23/0669

  having multiple fuel spray jets per injector nozzle · CPC title