Abstract: A device for controlling at least one valve, the device comprising a body having a non-deformable cavity communicating exclusively with the outside via at least four rectilinear cylinders that are closed respectively by an opening piston (P1) actuated by an opening cam (C1), a closing piston (P2) actuated by a closing cam (C2), a shuttle piston (Pa) serving to load or unload the device, and a piston (Ps) that is mechanically connected to the valve. By adjusting the angular phase shift between the opening and closing cams (C1, C2), the control device of the invention makes it possible in operation to adjust the lift of the valve, the angular duration of the opening of the valve, and if necessary, to deactivate the valve completely throughout the duration of a cycle.

Abstract: A device for controlling at least one valve, the device comprising a body having a non-deformable cavity communicating exclusively with the outside via at least four rectilinear cylinders that are closed respectively by an opening piston (P1) actuated by an opening cam (C1), a closing piston (P2) actuated by a closing cam (C2), a shuttle piston (Pa) serving to load or unload the device, and a piston (Ps) that is mechanically connected to the valve. By adjusting the angular phase shift between the opening and closing cams (C1, C2), the control device of the invention makes it possible in operation to adjust the lift of the valve, the angular duration of the opening of the valve, and if necessary, to deactivate the valve completely throughout the duration of a cycle.

Abstract: Turbocharger supercharged internal combustion engine, of which the exhaust manifold (22) comprises a first outlet (20) constantly supplying a turbine (18) for driving a compressor (12), a second outlet (34) equipped with means of sealing (36) synchronized with the rotation of the engine in order to supply a recycling conduit (46) of exhaust gas and a third outlet connected by a by-pass conduit (58) at the outlet of the turbine (18).

Abstract: Reciprocating internal combustion engine supercharged by a turbocharger of which the compressor (10) is driven by a turbine rotor (7) supplied with burnt gases on the entire periphery thereof by a single distribution volute (6), this engine comprising two cylinder groups purged by two exhaust collectors (3) giving respectively into one of two convergent nozzles (4) parallel to the inlet direction of the volute (6) of the turbine and of which the collars (8) are adjacent and have cross-sections that are equal to that of the inlet (5) of the volute (6), the nozzles (4) being carried out at the volute by a convergent conical channel (9) of which the length is between 3 and 8 times the inlet diameter of the volute.

Abstract: Four-stroke internal combustion engine comprising N groups of two or three cylinders the exhaust phases of which do not interfere with one another, the exhaust ports (6) of which are linked together by an individual exhaust manifold (3) which communicates with a common inlet manifold (2) and is linked to one of the N inlets (19) of a shutter (14) the single outlet of which is connected to the inlet of a turbine (5), common to the N groups and which is controlled in such a way as to open an exclusive communication between the turbine (5) and each exhaust manifold (3) at least for the duration of the puffs of exhaust gases emitted by one of the cylinders that it is emptying.

Abstract: This device is designed for a piston which is designed to move in alternating linear movement parallel to the axis of a chamber divided by the piston into a high pressure volume and a low pressure volume, and is of the type comprising: a circular cylindrical sliding surface bounding the chamber, an annular groove provided in the piston which is coaxial with the sliding surface and open towards the sliding surface, and a closed resilient sealing ring housed in a leak tight manner in the groove and intended to make sealing contact with the sliding surface. According to one aspect of the invention the ring is designed to determine the size of a lubricating oil film between the ring and the sliding surface to a limit lubricating thickness preferably from 0.1 ?m to 1 ?m when it moves from the high pressure volume to the low pressure volume.

Abstract: Turbocharger supercharged internal combustion engine, of which the exhaust manifold (22) comprises a first outlet (20) constantly supplying a turbine (18) for driving a compressor (12), a second outlet (34) equipped with means of sealing (36) synchronised with the rotation of the engine in order to supply a recycling conduit (46) of exhaust gas and a third outlet connected by a by-pass conduit (58) at the outlet of the turbine (18).

Abstract: A reciprocating engine includes a turbocharging unit that: supplies the intake manifold with air via a coolant; is supplied with gas by the exhaust manifold; and has the turbine supply pressure substantially equal to the compressor discharge pressure. At constant air temperature, the turbocharging unit delivers a substantially constant volume of cooled air when the pressure varies, and the volume is substantially proportional to the turbine outlet section. The turbine pressure is maintained substantially equal to compressor pressure by a EGR bypass between the intake and exhaust manifold. In addition, the volume of air is less than the volume drawn in at the speed so that a flow of hot gases is drawn in again via the bypass above the speed, where the volume drawn in is equal to the volume, and a flow of air is deflected towards the turbine below the speed.

Abstract: This device is of the type comprising a high-pressure turbine (20) and a low-pressure turbine (14) which are arranged in series, and a bypass pipe (32) for the high-pressure turbine (20) which connects a charging pipe (26) to an exhaust pipe (28) of the high-pressure turbine (20). According to a feature of the invention, the bypass pipe (32) opens in the exhaust pipe (28) via a pressure-reduction nozzle (34) which allows the gases derived by the bypass pipe (32) to be discharged in a mixing portion (46) of the exhaust pipe (28) substantially in accordance with the direction and sense of flow in the mixing portion (46) of the gases which are depressurised in the high-pressure turbine (20), in order to increase the flow rate of the gases which are depressurised in the high-pressure turbine (20) by mixing with the derived gases.

Abstract: The invention concerns a variable timing device for reciprocating engines with, at least two cam shafts (AC1, AC2) comprising, at least an intake valve (A) and at least an exhaust valve (E) actuated by said shafts, and means for shaft angular offset D1, D2). The invention is characterised in that at least a common valve (A) is actuated by hydraulic transmission means (4, 9, 10) adapted to transmit to said valve the movement of at least two cams (A1, A2) belonging to the shafts with distinct cams (AC1, AC2) capable of being offset relative to each other. The invention also concerns engines comprising said timing system and a timing and turbocharging method capable of using said distribution.

Abstract: The invention concerns a variable timing device for reciprocating engines with, at least two cam shafts (AC1, AC2) comprising, at least an intake valve (A) and at least an exhaust valve (E) actuated by said shafts, and means for shaft angular offset D1, D2). The invention is characterised in that at least a common valve (A) is actuated by hydraulic transmission means (4, 9, 10) adapted to transmit to said valve the movement of at least two cams (A1, A2) belonging to the shafts with distinct cams (AC1, AC2) capable of being offset relative to each other. The invention also concerns engines comprising said timing system and a timing and turbocharging method capable of using said distribution.

Abstract: A loop-scavenged two-stroke internal combustion engines with an intake valve (7) engaging a seat (10) for fresh air intake, and an exhaust valve (8) engaging a seat (13) for combustion gas exhaust, is disclosed. The valves are arranged in such a way that the fresh air intake scavenges a substantial part of the burnt gases. In at least one of the valves, the valve surface (21) located downstream from the valve face (9) and the surface (23) of the downstream extension of the seat (10) are configured in such a way that they form a substantially isentropic diffuser.

Abstract: A device for injecting high pressure atomized fuel liquid into the combustion chamber of an internal combustion engine such as a diesel engine. The device includes a mechanism for delivering high pressure liquid fuel (16) such as a pump. The mechanism communicates via a cyclic communication device with an injection chamber (26) of variable volume having a movable element (27) returned by a resilient returning element (28) towards a stop (33), and communicates permanently with the nozzle cavity (10). The amount of liquid fuel is delivered to the injection chamber during the cyclic closing phase of a nozzle obturator (14).

Abstract: A device including a first moving part such as a piston (1) and a second moving part such as a connecting rod (2) with a coupling part (4) therebetween. A low-pressure compressible liquid lubricant feed system delivers a liquid into a chamber (10) with a variable volume between the second part and the coupling part, to form a pump supplying the joint interstice (16) to be lubricated, by a one-way connection (13, 15) and a resilient return member (11), wherein the interstice communicates with a cavity (17) with a fixed volume used as a liquid lubricant source. The volume, in relation to the pump displacement, enables a degree of deflection of the pump piston (3) while achieving a sufficiently high pressure and compensating for leakage.

Abstract: One of the driving and driven parts of the coupling is connected to a cylinder (10) and the other to a piston (11) which delimit therebetween two antagonistic chambers (13, 14). The chambers have a substantially constant volume, are filled with a practically incompressible hydraulic liquid, and are interconnected through two unidirectional circuits (18, 19) which have opposite directions and each a substantially constant volume. A distributing device (22) is so arranged as to either bring into action one or the other of the unidirectional circuits, or to neutralize both of them.

Abstract: One of the driving and driven parts of the coupling is connected to a cylinder (10) and the other to a piston (11) which delimit therebetween two antagonistic chambers (13, 14). The chambers have a substantially constant volume, are filled with a practically incompressible hydraulic liquid, and are interconnected through two unidirectional circuits (18, 19) which have opposite directions and each a substantially constant volume. A distributing device (22) is so arranged as to either bring into action one or the other of the unidirectional circuits, or to neutralize both of them.