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

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, characterized in that it comprises:

• 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 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 stratification valve (20) off its seat (21), keeping it open and returning it to its 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 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 stratification injection conduit (39), or within said circuit and said conduit;
• 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).