High-pressure spark-ignition and stratification device for an internal combustion engine

Patent metadata

Field	Value
Publication number	US-2017191405-A1
Application number	US-201715465897-A
Country	US
Kind code	A1
Filing date	Mar 22, 2017
Priority date	Feb 6, 2012
Publication date	Jul 6, 2017
Grant date	—

Abstract

A high-pressure spark-ignition and stratification device ( 2 ) for internal combustion engine ( 1 ) includes:
a stratification valve ( 20 ) closing a stratification conduit ( 23 ) which opens into a stratification prechamber ( 79 ), the conduit also opening into a stratification chamber ( 24 ) connected by a stratification injection conduit ( 39 ) to the combustion chamber ( 9 ) of the internal combustion engine ( 1 ), the conduit opening near protruding electrodes ( 26 ) of a spark plug ( 25 ), the electrodes being positioned in the combustion chamber; a stratification actuator ( 27 ) responsible for lifting the stratification valve ( 20 ); a stratification line ( 28 ) connecting the stratification prechamber ( 79 ) to the outlet of a stratification compressor ( 29 ); a stratification fuel injector ( 33 ); elements for recirculating previously cooled exhaust gases ( 40 ).

First claim

1 . A high-pressure spark-ignition and stratification device for an internal combustion engine ( 1 ), said engine comprising a cylinder head ( 8 ) having at least one combustion chamber ( 9 ) into which there open an intake conduit ( 11 ) communicating with an intake plenum ( 19 ), and an exhaust conduit ( 10 ) communicating with an exhaust manifold ( 18 ) and a catalytic converter ( 75 ) for post-treatment of the pollutants, said engine further comprising a pressurized lubrication circuit ( 14 ), a cooling circuit ( 17 ) and an ECU computer, comprising:
at least one stratification valve ( 20 ) housed in the cylinder head ( 8 ) of the internal combustion engine ( 1 ), said valve being kept in contact with a seat ( 21 ) by at least one spring ( 22 ) and said valve closing a first end of at least one stratification conduit ( 23 ) which opens into a stratification prechamber ( 79 ) while a second end that said conduit comprises opens into a stratification chamber ( 24 ), the latter being connected by at least one stratification injection conduit ( 39 ) to the combustion chamber ( 9 ) of the internal combustion engine ( 1 ), said at least one stratification injection conduit ( 39 ) opening into said combustion chamber ( 9 ) near protruding electrodes ( 26 ) of a spark plug ( 25 ) fixed in the cylinder head ( 8 ) of the internal combustion engine ( 1 ), said electrodes being positioned in the combustion chamber ( 9 ) of said engine ( 1 ); at least one stratification actuator ( 27 ) controlled by the ECU computer of the internal combustion engine ( 1 ), said actuator being responsible for lifting the at least one stratification valve ( 20 ) off a seat ( 21 ), keeping the at least one stratification valve open and returning the at least one stratification valve to the seat; at least one stratification line ( 28 ) connecting the stratification prechamber ( 79 ) to the outlet of a stratification compressor ( 29 ) the inlet of which is connected directly or indirectly to an atmospheric stratification air supply conduit ( 30 ), said supply conduit, said compressor and the inlet and outlet thereof, said line, said prechamber and the at least one stratification conduit ( 23 ) forming in combination an atmospheric air supply circuit ( 31 ) for the stratification chamber ( 24 ), and said chamber itself forming an integral part of said circuit; at least one stratification fuel injector ( 33 ) controlled by the ECU computer of the internal combustion engine ( 1 ), said injector being capable of producing a jet of fuel either within the atmospheric air supply circuit ( 31 ) for the stratification chamber ( 24 ) at any point in said circuit, or within the at least one stratification injection conduit ( 39 ), or within said circuit and said conduit; the stratification injection at least one stratification injection conduit ( 39 ) comprises at least one stratification injection capillary ( 16 ) formed inside a central electrode ( 47 ) that the spark plug ( 25 ) comprises so that the first end of said capillary communicates with the stratification chamber ( 24 ) and the second end of said capillary opens at the end of said central electrode ( 47 ).

2 . The high-pressure spark-ignition and stratification device for internal combustion engine according to claim 1 , further comprising at least means of recirculating previously cooled exhaust gases, called “external cooled EGR” means ( 40 ), controlled by the ECU computer of the internal combustion engine ( 1 ), said means making it possible to tap exhaust gases from the exhaust conduit ( 10 ) of said engine and then reintroduce said gases to the intake side of said engine after said gases have previously been cooled by means of at least one cooler ( 41 ).

3 . The high-pressure spark-ignition and stratification device for internal combustion engine according to claim 1 , wherein the seat ( 21 ) of the at least one stratification valve ( 20 ) has a face oriented toward the outside of the stratification prechamber ( 79 ) in such a way that the stratification actuator ( 27 ) can lift said valve off said seat only by moving said valve away from or closer toward said prechamber.

4 . The high-pressure spark-ignition and stratification device for internal combustion engine according to claim 1 , wherein the stratification actuator ( 27 ) comprises at least one coil of conductive wire ( 50 ) secured to the cylinder head ( 8 ) of the internal combustion engine ( 1 ), said coil attracting a magnetic core or blade ( 51 ) when an electric current flows through said coil, so that said at least one core or blade moves in longitudinal translation the at least one stratification valve ( 20 ) to which is connected by coil pushing or pulling means ( 42 ).

5 . The high-pressure spark-ignition and stratification device for internal combustion engine according to claim 1 , wherein the stratification actuator ( 27 ) comprises at least one stack of piezoelectric layers ( 52 ) a thickness of which varies when said layers are subjected to the passage of an electric current, in such a way that said stack moves in longitudinal translation the at least one stratification valve ( 20 ) to which it is connected by stack pushing or pulling means ( 80 ) and/or by means of at least one lever which multiplies the displacement imparted by said stack to said valve.

6 . The high-pressure spark-ignition and stratification device for internal combustion engine according to claim 1 , wherein the stratification actuator ( 27 ) comprises a pneumatic stratification actuating cylinder comprising a pneumatic stratification receiving chamber and a pneumatic stratification receiving piston, said piston being secured to the at least one stratification valve ( 20 ) or being connected thereto by pneumatic piston pushing or pulling means, whereas said pneumatic chamber can be placed in communication either with a high-pressure reserve of air or the open air or with a low-pressure reserve of air by at least one solenoid valve.

7 . The high-pressure spark-ignition and stratification device for an internal combustion engine according to claim 1 , wherein the stratification actuator ( 27 ) comprises a hydraulic stratification actuating cylinder ( 36 ) comprising a hydraulic stratification receiving chamber ( 37 ) and a hydraulic stratification receiving piston ( 38 ), said piston being secured to the at least one stratification valve ( 20 ) or being connected to the latter by hydraulic piston pulling or pushing means ( 53 ).

8 . The high-pressure spark-ignition and stratification device for internal combustion engine according to claim 1 , wherein the stratification fuel injector ( 33 ) is connected to a reservoir ( 55 ) of pressurized combustible gas.

9 . The high-pressure spark-ignition and stratification device for internal combustion engine according to claim 1 , wherein the atmospheric air supply circuit ( 31 ) for the stratification chamber ( 24 ) comprises a homogenization circulator ( 56 ), said homogenization circulator being placed at any point of said circuit and agitating atmospheric air or a gaseous mixture contained in said circuit by causing said air or said mixture to circulate through said circuit.

10 . The high-pressure spark-ignition and stratification device for internal combustion engine according to claim 1 , wherein the atmospheric air supply circuit ( 31 ) for the stratification chamber ( 24 ) comprises an air-to-air heat exchanger ( 57 ) for heating the supply circuit ( 31 ) which heats atmospheric air or a gaseous mixture contained in said atmospheric air supply circuit by extracting heat from the exhaust gases of the internal combustion engine ( 1 ), said air or gaseous mixture and said exhaust gases passing simultaneously through said ex

Assignees

• Rabhi Vianney

Inventors

• Rabhi Vianney

Classifications

• F02M26/70

  Flap valves; Rotary valves; Sliding valves; Resilient valves · CPC title

• F02M21/0215

  Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas · CPC title

• F02M26/22

  with coolers in the recirculation passage · CPC title

• F02P13/00

  Sparking plugs structurally combined with other parts of internal-combustion engines ({connection of ignition coil to spark plug connector F02P3/02;} with fuel injectors F02M57/06 {; spark plug connector per se H01T13/04 – H01T13/06; predominant aspects of sparking plug, see H01T13/40 – H01T13/44}) · CPC title

• F02M31/13

  Combustion air · CPC title