Abstract: The following disclosure relates to junctions for combining a flow at an outlet manifold. More specifically, the following disclosure relates to junctions configured to reduce outlet manifold pressure enabling the use of smaller outlet manifolds for electrochemical cells and cell stacks.

Abstract: A combustion engine for a motor vehicle includes an exhaust gas tract through which exhaust gas from a combustion chamber of the combustion engine can flow. An exhaust gas turbocharger has a turbine which is arranged in the exhaust gas tract and which has a turbine housing and a turbine wheel at least partially received in the turbine housing and driveable by the exhaust gas. Via a secondary air channel, which opens out into the exhaust gas tract, secondary air flowing through the secondary air channel can be introduced into the exhaust gas flowing through the exhaust gas tract. The secondary air channel opens out inside the turbine housing into the exhaust gas tract.

Abstract: A compressor arrangement for a turbocharger is disclosed. The compressor arrangement comprises a compressor housing and a compressor wheel arranged to rotate in the compressor housing. The compressor housing comprises a compressor inlet duct, a ported shroud, and a recirculation channel comprising an inlet arranged downstream of the compressor wheel, an outlet arranged in the compressor inlet duct at a position upstream of ports of the ported shroud, and a valve configured to control the flow of air through the recirculation channel. The compressor arrangement further comprises a wall section protruding into the compressor inlet duct at a position upstream of the outlet of the recirculation channel. The present disclosure further relates to a turbocharger, an internal combustion engine, and a vehicle.

Abstract: A low-temperature turbocompressor structural arrangement for an internal combustion engine for using energy that is available but unused during operation to cool the air supplied to the engine by supercharging. The temperature of the air compressed by the compressor is reduced by a cooling system and the air is then conveyed to a further turbine actuated by the intake air flow of the engine. The structural arrangement may be mounted in full or in part, and also each component may be fitted into existing systems.

Abstract: A system for controlling turbocharger shaft speed for an internal combustion engine (ICE) includes sensors and actuators and control modules in communication with the sensors and actuators. The control modules store and execute control logic that generates a predicted shaft speed from turbocharger shaft speed data. A shaft speed control algorithm (SSCA) is selectively initialized. The SSCA generates lower and upper limits to turbocharger flow corrections applied via the actuators. Closed loop control outputs are applied selectively to the actuators to control a mass flow through a compressor of the turbocharger. The SSCA selectively determines the shaft speed has exceeded a threshold, and the actuators alter a pressure ratio of the ICE. The SSCA operates the turbocharger stably within predefined hardware limits at an optimum shaft speed while maintaining constant flow across a range of pressure ratios. A long-term memory learning process trims turbocharger performance.

Abstract: An ATS includes an SCR device and is connected to an internal combustion engine so as to receive an exhaust gas flow from at least one cylinder of the internal combustion engine when fuel is injected and combusted in such cylinder; an NH3 storage is increased in such SCR device after an engine shut off command has been detected, such that an increased NH3 storage is ready for a subsequent cold start of the internal combustion engine; the increase of NH3 storage is carried out by injecting a reducing agent in the ATS and by supplying an air flow towards the SCR device; such air flow flows through the cylinder after the fuel injection has been shut off.

Abstract: A wastegate valve device according to at least one embodiment is a wastegate valve device disposed on a bypass passage bypassing a turbine of a turbocharger arranged on an exhaust gas passage of an engine, including: a valve seat surface formed at an outlet of the bypass passage; and a wastegate valve body which includes a support arm supported rotatably about an axis and a valve body supported by the support arm, the valve body being configured to come into and out of contact with the valve seat surface in accordance with rotation of the support arm. In the wastegate valve device according to at least one embodiment, the valve seat surface is inclined with respect to a direction orthogonal to an axial direction of the bypass passage, as viewed from a direction of the above-described axis.

Abstract: A catalyst device includes a catalyst, a heating element, and a case. A direction in which exhaust gas flows through an exhaust passage is defined as a gas discharging direction. The case includes an end portion on an upstream side in the gas discharging direction. The heating element includes an end on an upstream side in the gas discharging direction. The end portion of the case is an insulating portion that insulates electricity and protrudes toward an upstream side of the end of the heating element in the gas discharging direction. The catalyst device further includes an outer tube that is separated from the end portion of the case in a radial direction to cover the end portion. The outer tube is formed by a turbine housing that houses a turbine wheel of the forced-induction device.

Abstract: Method of operating an internal combustion engine that applies to both types of ignition types; Spark Ignition (SI) and Compression Ignition (CI). The method comprises opening the intake valve, allowing the fuel and air mixture to flow through the intake valve and into the chamber during at least during a portion of the intake stroke; closing the intake port during a portion of the intake stroke; applying a negative pressure during a portion of the intake stroke; directly or indirectly igniting the fuel and air mixture during a portion of the intake stroke; opening the exhaust valve during the exhaust stroke. The operation of intake valve, the exhaust valve, and the application of the ignition source is performed at any time during the intake and/or exhaust stroke or cycle.

Abstract: Disclosed is an efficient recycling system for exhaust energy of an internal combustion engine. Firstly, a thermoelectric generation device recycles high-temperature waste heat energy in the exhaust of the internal combustion engine and recycles high-temperature heat that originally radiates into the ambient atmosphere on the surface of the volute (24). Secondly, pressure energy in the exhaust of the internal combustion engine is efficiently recycled by using a turbocharging device, and the efficiency of the turbocharging device is improved through the graphite sealing device. Finally, low-temperature waste heat energy in the exhaust of the internal combustion engine is efficiently recycled by using an organic Rankine cycle device. The risk of decomposition caused by the fact that the working medium used by organic Rankine cycle works in a high-temperature environment is avoided, thereby ensuring the cycle efficiency and the working reliability of the organic Rankine cycle.

Abstract: A vehicle and a control method are capable of generating compressed air using a motor of a hybrid vehicle so as to perform cleaning/care of the hybrid vehicle, without an additional or separate device. The vehicle includes an engine including an intake pipe provided to suck outside air and an exhaust pipe provided to discharge inside air, an opening degree control valve provided at a rear end of the exhaust pipe, and a motor configured to generate power for driving a wheel and configured to drive a piston of the engine by using a portion of the power. In response to the opening degree control valve being in a closed state, and in response to the engine being in a non-combustion state, compressed air is generated in the exhaust pipe by driving the piston of the engine with the power of the motor.

Abstract: An internal combustion engine with a turbocharger according to an embodiment includes a cylinder block internally including a plurality of cylinders, a cylinder head disposed on top of the cylinder block, and internally including a plurality of exhaust flow passages through which exhaust air discharged from each of the plurality of cylinders flows, and the turbocharger including a rotational shaft, a turbine wheel, and a compressor wheel, the turbine wheel being disposed at one end of the rotational shaft, the compressor wheel being disposed at the other end of the rotational shaft. At least the turbine wheel of the turbocharger is arranged inside the cylinder head.

Abstract: The disclosure relates to a valve assembly 10 for controlling a volute connecting opening 324 of a multi-channel turbine 500. The valve assembly 10 comprises a housing portion 300, a valve body 100 and an internal lever 200. The housing portion 300 defines a first volute channel 312, a second volute channel 314 and a volute connecting region 320. The housing portion 300 further comprises a cavity 340. The cavity 340 is separated from the volutes 312, 314 and can be accessed from outside the housing portion 300 via a housing opening 342 which extends from outside the housing portion 300 into the cavity 340. The volute connection region 320 is located between the first volute channel 312 and the second volute channel 314 and defines a volute connecting opening 324. The valve body 100 is inserted in the cavity 340 of the housing portion 300 and comprises at least one fin 120.

Abstract: A vehicle monitoring apparatus including: a camera disposed in a vehicle lamp; a guide duct configured to guide outside air introduced into the vehicle; and a nozzle connected to the guide duct and configured to discharge the air to a front side of the camera, thereby improving stability and reliability.

Abstract: Use of the hydraulically driven device in a series configuration with a minimally restrictive turbocharger is defined which will allow a very responsive and powerful boosting system to reach boost levels of 4-5 pressure ratio (PR) to support and enable OEM engine downsizing trends. An electric supercharger is also considered. A hydraulic drive assists to increase the acceleration rate of a turbocharger impeller/turbine shaft assembly and provide a secondary means of driving the compressor impeller at lower engine speeds where exhaust gases alone does not generate adequate shaft speeds to create significant induction boost. The hydraulic circuit includes a dual displacement motor, which provides high torque for acceleration yet converts to a single motor for high-speed operation. When the exhaust driven turbine function allows compressor speeds, beyond which the hydraulic system can contribute, a slip clutch allows disengagement of the hydraulic drive.

Abstract: An engine assembly for a vehicle includes an engine and a turbocharger operatively connected thereto. A controller is configured to, based on at least one performance parameter associated with the vehicle, execute a pre-acceleration control sequence including: delaying ignition within the engine's cylinders to increase a temperature of exhaust gas discharged to the turbocharger and reduce a torque of the engine; deactivating at least one cylinder in a predetermined pattern to reduce the torque of the engine; actuating a throttle valve to increase air flow to the engine to (i) increase the torque of the engine, and (ii) increase a volume of exhaust gas discharged to the turbocharger; and increasing a volume of fuel injected by the fuel injectors into the cylinders so as to increase the torque of the engine thereby compensating at least in part reduction of the torque of the engine.

Abstract: A method for operating a supercharged internal combustion engine. Before a cold start of the engine, an electric drive device of an electrically assisted exhaust-gas turbocharger of the engine is activated such that fresh air is compressed by a compressor of the turbocharger and, in the process, is heated and is conveyed via an open overrun air recirculation valve arranged downstream of the compressor, through a short circuit back to a suction side of the compressor of the turbocharger. A proportion of the air that is heated by way of the short-circuit operation of the compressor is, downstream of the compressor and upstream of a closed throttle flap of the engine, conducted via a secondary air system into an exhaust manifold and from there via a wastegate of the turbocharger into the catalytic converters of an exhaust-gas aftertreatment device of the engine.

Abstract: A system for forming a negative pressure in a negative pressure reservoir of a brake system includes, an engine having an intake manifold and a camshaft, a vacuum pump connected to the camshaft through a clutch device and generating a pump negative pressure, a turbocharger having a compressor supplying a compressed air to the engine, a pump negative pressure line connecting the vacuum pump and the negative pressure reservoir and supplying the pump negative pressure to the negative pressure reservoir, an intake negative pressure line connecting the negative pressure reservoir and the intake manifold and supplying the intake negative pressure of the intake manifold to the negative pressure reservoir, and a negative pressure source selection apparatus configured to control opening and closing of the pump negative pressure line and the intake negative pressure line based on operation of the turbocharger.

Abstract: In an exhaust gas processing device, an air-fuel ratio sensor is provided such that a measuring portion is located in a region surrounded by a downstream-side end surface of a TWC, an upstream-side end surface of a GPF, and an inner wall surface of a case against which the exhaust gas G that has passed through the TWC flows, that is the region a region on the GPF side of the center of the TWC.

Abstract: A turbine connector in an engine exhaust manifold includes a turbine foot attached to incoming exhaust conduits. The turbine foot has an outer perimetric edge defining a trapezoidal shape, and inner perimetric edges forming exhaust outlets from the incoming exhaust conduits. The inner perimetric edges have varied perimetric curvatures largest in finite curvature size upon a web extending between the exhaust outlets, and together forming an hourglass web profile in a turbine-mounting plane defined by the turbine foot.

Abstract: Methods and systems are provided for controlling engine oil dilution in automotive vehicles. The method comprises heating coolant by operating an exhaust gas heat recovery device and circulating the heated coolant via a first coolant loop between the exhaust gas heat recovery device and a heat exchanger; and heating coolant by operating an exhaust gas recirculation cooler and circulating the heated coolant via a second coolant loop between the exhaust gas recirculation cooler and the heat exchanger, wherein the heated coolant from both the exhaust gas heat recovery device and the exhaust gas recirculation cooler mix at the heat exchanger and allows heating of an engine oil via the heat exchanger. In one example, the method prevents excessive accumulation of water and/or fuel in the engine oil.

Abstract: The present invention relates to a gas heat pump system. A gas heat pump system according to one embodiment of the present invention comprises: a compressor for compressing a refrigerant; a gas engine for driving the compressor; a mixer for mixing air and fuel to generate a mixed gas to be supplied to the gas engine; a mixed gas supply line connected between the mixer and the gas engine; and a supercharger for supercharging the mixed gas supplied to the gas engine through the mixed gas supply line, wherein the supercharger comprises a sealed housing formed by sealing the remaining parts thereof other than an inlet port and an outlet port through which the mixed gas moves into and out of the housing, and a bypass line is provided between the sealed housing and the inlet port of the supercharger so as to resupply a mixed gas in the sealed housing to the inlet port of the supercharger.

Abstract: A centrifugal compressor includes an impeller, a plurality of diffuser vanes arranged in a circumferential direction on a radially outer side of the impeller, and a housing which includes a scroll portion forming a scroll flow passage positioned on a radially outer side of the plurality of diffuser vanes. The plurality of diffuser vanes include at least one first diffuser vane positioned in an angular range between a tongue section of the scroll portion and a scroll end of the scroll portion in the circumferential direction, and a second diffuser vane positioned outside the angular range. A vane outlet angle formed by a tangent line at a trailing edge to a pressure surface of each of the plurality of diffuser vanes satisfies ?1<?2, where ?1 is the vane outlet angle of the first diffuser vane, and ?2 is the vane outlet angle of the second diffuser vane.

Abstract: A catalytic converter for an internal combustion engine has a housing (2) and a catalyst element (12) formed in the housing (2). The housing (2) is formed such that exhaust gas of the internal combustion engine can flow through the housing (2). The catalyst element (12) is formed such that fluid can flow around and through it. Additionally, the catalyst element (12) has a plurality of ribs (15) on its surface (14) that faces the exhaust gas.

Abstract: A seal structure includes a cylindrical outlet wall portion which forms an outlet passage at a downstream side of a turbine wheel and an annular shroud portion which is provided in a second nozzle ring and faces a blade portion. A proximal end portion of the outlet wall portion and a distal end portion of the shroud portion face each other with a gap interposed therebetween in an axial direction. An annular seal member is disposed at an inner peripheral portion of the gap in a radial direction. The seal member comes into contact with the proximal end portion of the outlet wall portion and the distal end portion of the shroud portion to block the gap.

Abstract: A centrifugal compressor includes: a housing; an impeller rotatably disposed within the housing; a rotational shaft connected to the impeller; and a bearing member supporting the rotational shaft in the housing. An oil flow passage through which oil flows is formed in the housing. The oil flow passage includes a lubricating oil passage through which the oil flows as lubricating oil to be supplied to the bearing member, and a cooling oil passage through which the oil flows as cooling oil for heat exchange with a fluid compressed by the impeller. The cooling oil passage is configured so that the oil flows into the cooling oil passage as the cooling oil without passing through the bearing member.

Abstract: The invention relates to a sealing gasket, for sealing a connection between an exhaust manifold and a turbine of a vehicle, the sealing gasket comprising two flow passage openings separated by a dividing wall and a first sealing portion extending around the two openings. The sealing gasket includes at least a second sealing portion extending around one of the two openings, and preferably a third sealing portion extending around the other of the two openings.

Abstract: An exhaust system includes an exhaust manifold structured to be fluidly coupled to an engine. A turbocharger including a turbine housing is fluidly coupled to the exhaust manifold. An exhaust pulse converter includes a first portion integral to the exhaust manifold and a second portion integral to the turbine housing. The exhaust pulse converter is structured to reduce engine pumping losses by reducing cross-talk of exhaust blowdown events from the engine.

Abstract: The invention relates to an exhaust gas turbocharger with a manifold-flow casing, in particular a dual-flow casing (47) and a turbine wheel (34) which is rotatably arranged within said manifold-flow casing, onto which an exhaust gas flow (14; 16) may be led via at least one of several flow channels (18, 26), and an outlet opening (78; 80) following said one flow channel (18, 26) and covering an angle of 180° max. about an axis of rotation (44) of the turbine wheel (34), so that a shaft (38) is rotating which is arranged coaxially and non-rotationally relative to the turbine wheel (34), which is supported in a shaft bearing (42).

Abstract: A compound engine system includes a rotary engine with rotating chambers, a compressor section in successive communication with the rotating chambers, and a turbine section in successive communication with the rotating chambers. The turbine section has an output shaft. The output shaft and the engine shaft are drivingly engaged to each other and wherein the turbine section has a power output corresponding to from 20% to 35% of a total power output of the compound engine system. A method of compounding power in a compound engine system is also discussed.

Abstract: Provided is a vibration suppressing method for a supercharger, the supercharger including a shaft, a wheel arranged at one end or the other end of the shaft, and a housing including a wheel cover accommodating the wheel; the method including a determining step of determining a suppression target oscillation frequency to be a suppression target from among oscillation frequencies of the housing vibrating with shaft vibration of the shaft transmitted thereto, a preparing step of preparing a vibration suppressing unit having a natural frequency to be tuned in to the suppression target oscillation frequency, and an attaching step of attaching the vibration suppressing unit prepared in the preparing step onto an outer face of the housing.

Abstract: An air turbine starter that includes a turbine member for rotatably extracting mechanical power from a flow of fluid, where the turbine member is coupled to a drive shaft to provide a rotational output. The air turbine starter further includes a foil-air bearing assembly and a thrust bearing that rotatably support the drive shaft.

Abstract: A cylinder head arrangement for an internal combustion engine is provided. The cylinder head includes an integrated exhaust manifold having first and second exhaust passages to collect exhaust gas from respective cylinders to direct the exhaust gas to respective outlets of the cylinder head. The cylinder head includes a flange where the first and second outlets exit the cylinder head for connection with a turbocharger.

Abstract: A waste heat recovery system in thermal communication with an exhaust conduit of an internal combustion engine of a vehicle includes a condenser. The condenser includes a working fluid conduit configured to connect to a working fluid loop of the waste heat recovery system and a coolant fluid conduit configured to connect to a coolant fluid loop used to cool the internal combustion engine of the vehicle. The coolant fluid conduit includes a coolant fluid inlet and a coolant fluid outlet. The waste heat recovery system also includes a coolant fluid bypass fluidly connected between the coolant fluid inlet and the coolant fluid outlet. The coolant fluid bypass includes a coolant fluid control valve configured to vary a portion of the volume of coolant fluid that flows through the coolant fluid bypass based on a temperature of a working fluid in the working fluid loop.

Abstract: Methods and systems are provided for an exhaust gas system. In one example, a system comprises a conical passage fluidly coupling a turbine outlet to an aftertreatment device. The conical passage may further comprise a scavenge valve to adjust exhaust gas flow therethrough.

Abstract: A multi-cylinder engine includes an engine body having first and second cylinder groups, first and second exhaust passage groups each having a plurality of independent exhaust passage parts and a collective exhaust passage part, and an exhaust gas recirculation (EGR) passage. In a plan view in cylinder axis directions, the passage groups are disposed adjacent to each other, and, in the first exhaust passage group, a first independent exhaust part of the plurality of independent exhaust passage parts is connected to the EGR passage and a second independent exhaust passage part is connected to the collective exhaust passage part so as to be directed to a connection of the first independent exhaust passage part to the collective exhaust passage part, and in the second exhaust passage group, an opening of the collective exhaust passage part is offset toward the first exhaust passage group in a lineup direction.

Abstract: A method, system, and apparatus relating to operating an internal combustion engine include steps or features for determining a performance threshold of a particulate filter disposed in an exhaust gas flow of the engine having a set time interval between regeneration events of the particulate filter; determining a rate at which the particulate filter is reaching the performance threshold; and controlling an exhaust gas characteristic to control the rate so that the performance threshold is reached at or just before an end of the time interval. In an embodiment, there are steps or features for interpreting a filter condition of the particulate filter; determining a particulate matter load rate of the filter as a function of the condition; determining a limit of an exhaust gas characteristic based on the load rate; and controlling engine operation to control the exhaust gas characteristic to satisfy the limit.

Abstract: Provided is a cooling system capable of effectively avoiding generation of bubbles in the flow passage including the piping unit that climbs over the barrier upon start of the pump that has been in the stopped state. The cooling system 100 includes a cooling tank 11 filled with a coolant C, flow passages 15, 16 through which the coolant discharged from an outlet of the cooling tank 11 returns to an inlet of the cooling tank 11, an inverted U-like piping unit 16a disposed in the middle of the flow passage 16, a main pump 31, an auxiliary pump 33 disposed opposite the main pump 31 while interposing the inverted U-like piping unit 16a with the main pump 31, and a controller 35 which controls driving operations of the main pump 31 and the auxiliary pump 33. The controller 35 drives the auxiliary pump 33 for a predetermined time period before starting the main pump 31.

Abstract: Systems, apparatus, and methods are disclosed that include an internal combustion engine having a plurality of cylinders and controlling a variable geometry turbocharger during early intake valve opening to reduce or prevent oil consumption.

Abstract: The present disclosure aims to improve circulation of intake air and distribution of bypass intake air to cylinders, while reducing an increase in the overall height of an engine. A supercharger extends along a cylinder bank at a side of a surge tank extending along the cylinder bank. A bypass pipe branching off from an upstream intake pipe configured to introduce the intake air into the supercharger extends along the cylinder bank above the supercharger. A downstream side intake pipe configured to guide the intake air from the supercharger to the surge tank extends downward from the supercharger. The downstream intake pipe is, in a U-shape as viewed along the cylinder bank, connected to the surge tank.

Abstract: A method for controlling an inlet-adjustment mechanism in an air inlet for a compressor so as to switch the mechanism between open and closed positions for adjusting a flow area of the inlet. The method includes an algorithm for determining when the inlet-adjustment mechanism is in a failure mode. In accordance with the method, when the operating point on the compressor map is on the high-flow side of a threshold line at which the inlet-adjustment mechanism is switched from one position to the other, a measured speed or pressure ratio is compared to a theoretical value for the speed or pressure ratio based on a compressor map for the open position of the mechanism. If the measured value differs from the theoretical value by more than a predetermined tolerance, a failure mode is indicated.

Abstract: A turbocharger fastening structure may include an exhaust manifold integrated head having two exhaust ports; a fastening unit located on one end portion of a turbocharger to be fastened to the exhaust manifold integrated head; and an intake hole formed on the fastening unit, corresponding to the two exhaust ports of the exhaust manifold integrated head, and having a rib, the intake hole allowing exhaust gas to enter the turbocharger through the exhaust manifold integrated head.

Abstract: Methods and systems are provided for a compressor adapted with a movable sleeve and an active casing treatment that form separate air flow chambers. In one example, a method includes flowing intake air through a casing to an impeller of a compressor, and during first conditions, actuating an actuator to adjust a movable sleeve surrounding the casing from a first position to a second position and flowing intake air through a second chamber to the impeller, the movable sleeve adjusted in both a radial direction and an axial direction via a single actuating motion of the actuator. In this way, compressor surge may be mitigated without reducing compressor efficiency at higher air flow rates.

Abstract: Methods and systems are provided for a turbocharger comprising a compressor inlet shaped to mitigated condensate formation therein. In one example, system may include a condensate trap which runs along an inner wall of the compressor inlet and is shaped to trap condensate.

Abstract: A partition plate is configured to separate an intake passage formed by an intake pipe to be coupled to a combustion chamber into a first intake passage and a second intake passage. The first intake passage is openable and closable by a valve. A shape of a first cross section orthogonal to an extending direction of the intake pipe is set on the basis of a shape of a surface of the intake pipe that faces the partition plate with the second intake passage interposed therebetween.

Abstract: An arrangement having multiple heat exchangers and a method for evaporating a working fluid by transferring heat from a heat source medium is described herein. The arrangement is used in connection with a system for recovering energy from waste heat in a thermodynamic cycle, in which the waste heat is used as the heat source medium. Each heat exchanger has a heat source medium through-passage separated from a working fluid chamber are serially interconnected in a ring arrangement. A supply line is provided between the heat source medium through-passages of any two serially consecutive heat exchangers in the ring arrangement, which can be connected selectively to the inlet of the heat source medium through-passage of each heat exchanger. Further, a discharge line for the heat source medium is provided, which can be connected selectively to the outlet of the heat source medium through-passage of each heat exchanger.

Abstract: An exhaust gas recirculation system for an internal combustion engine is provided. The exhaust gas recirculation system includes: an EGR passage configured to connect an exhaust gas passage of the internal combustion engine with an intake air passage; an EGR cooling system arranged at the EGR passage; and a control device configured to control the EGR cooling system. The control device is configured to provide feedback control of the cooling efficiency of the EGR cooling system to cause the temperature of intake gas suctioned into a cylinder of the internal combustion engine to approach a target intake gas temperature. The control device is configured to more increase the amount of change of the cooling efficiency when the flow rate of EGR gas recirculated is less.

Abstract: A process for optimizing the consumption of reducing agent in the form of ammonia in an exhaust line including first and second selective catalytic reduction systems, the second system being arranged downstream of the first system, being spaced apart by a spacing, a surplus of unused ammonia passing via the exhaust line, the temperature in the exhaust line at the second system being measured or estimated. When the temperature at the second system exceeds a first maximum value, or when a calculated rate of temperature rise is greater than a predetermined rate of rise, with the proviso that the temperature at the second system is greater than a second maximum value that is less than the first maximum value, forced cooling is carried out in the spacing between the first and second systems.

Abstract: A centrifugal compressor (20) comprises: a housing (26); an impeller (34) having an axial inlet (70) and a radial outlet (72); a diffuser (82); and a control ring (90) mounted for shifting between an inserted position and a retracted position. The control ring comprises means (150, 160, 162, 166) for absorbing pulsations.

Abstract: The present invention relates to a device for controlling the amount of air fed into the intake of a charged internal combustion engine comprising two exhaust gas outlets (32, 36) which are each connected to an exhaust manifold (30, 34) of a group of at least one cylinder (121, 122, 123, 124). The device comprises a charging device (38) comprising a turbocompressor having a dual-inlet (46, 48) turbine (40) connected to the exhaust gas outlets and an external air compressor (44), and at least one duct for partially transferring compressed air from the compressor to the turbine inlets. According to the invention, the partial transfer duct (100, 102; 110, 112) is integrated into the cylinder head and comprises throttles (74, 76) controlling the circulation of compressed air in said duct.