Abstract: One embodiment of a method of operating a NOx abatement system comprises: introducing an exhaust stream to an ammonia generator in a normal flow direction, adsorbing NOx from the exhaust stream in the ammonia generator, diverting the exhaust stream around the ammonia generator, introducing hydrogen to the ammonia generator in a direction opposite the normal flow direction, and generating ammonia within the ammonia generator.

Abstract: The present invention relates to an exhaust device for adjusting an exhaust gas cross sectional area of an exhaust passage in a combustion engine. The exhaust device includes a valve body arranged in the exhaust passage communicating to an exhaust port of the combustion engine; a valve shaft fixed or integrally formed to the valve body and arranged so as to transverse the exhaust passage, the valve shaft changing the opening of the valve body by turning with the valve body about an axis of the valve shaft; a pair of bearing members for supporting rotatably the valve shaft at both ends thereof in a axial direction of the valve shaft; and a stopper arranged on the valve shaft so as to face an end face on the inward side of the exhaust passage of each bearing member in the axial direction. The stopper is restricted in the axial direction by the end face of each of the bearing members so that the valve body and the valve shaft do not move in the axial direction.

Abstract: A dual NOx trap system for reducing NOx emissions from an internal combustion engine. The system is plumbed and controlled such that the NOx adsorption time of a trap is decoupled from the NOx regeneration time. A trap is taken out of service for regeneration only for the minimum required regeneration time and then is placed back into service. Because regeneration times are short relative to adsorption times, during most of the working life of the assembly both of the traps are in service in NOx-trapping mode. Thus, higher NOx-trapping efficiencies are provided over most of the working life of the system because each unit volume of catalyst is in service for more than 50% of the time, permitting a smaller volume of catalyst for each trap than in a prior art system. Further, shorter off-line regeneration times result in reduced cooling of the traps during regeneration.

Abstract: The present invention has for its problem to be solved to provide a technique in which in an exhaust gas purification system for an internal combustion engine with a filter being arranged on an exhaust passage for trapping PM in an exhaust gas, it is possible to suppress an excessive rise in temperature of the filter during execution of filter regeneration control more preferably. In the present invention, when the amount of intake air in the internal combustion engine decreases up to an amount at which an excessive rise in temperature of the filter might be induced during the execution of filter regeneration control, the oxygen concentration of an ambient atmosphere around the filter is decreased up to a target oxygen concentration.

Abstract: An apparatus, system, and method are disclosed for enhancing the efficiency of an exhaust aftertreatment application. The method may include determining the current operating conditions of the application, the optimal operating conditions of a target component, and the performance criteria of a conditioning component relative to the optimal operating conditions. The method may include determining an optimal fraction of an exhaust flow to pass through the conditioning component to achieve the optimal operating conditions of the target component. The method may further include manipulating a bypass valve position based on the optimal fraction of exhaust flow to pass through the conditioning component. The target component may be a selective catalyst reduction (SCR) component that operates optimally at a designed NO2/NOx mole ratio. The conditioning component may be a diesel oxidation catalyst (DOC) that affects the NO2/NOx mole ratio.

Abstract: A exhaust gas cleaning purifier used in an engine of a locomotive, which is arranged between an exhaust pipe of the engine and a silencer connecting to the exhaust pipe, includes a front supply pipe and a back supply pipe configured for supplying secondary air, at least one front catalyst converter for making an oxidation reaction and at least one middle catalyst converter for making an reduction reaction, and at least one back catalyst converter arranged after the silencer and the back supply pipe. The front supply pipe connects with the exhaust terminal of the engine, and the back supply pipe connects with the silencer. The at least one front catalyst converter and the at least one middle catalyst converter are arranged in the silencer and arranged between the front and back supply pipes. A dissipating-heat distance is defined between the front catalyst converter and the middle catalyst converter.

Abstract: An exhaust throttling valve (ETV) system (10) is provided for a vehicle. The system includes an ETV (12) having a housing (14), a valve member (16) movable with respect to the housing between at least one state and another state within an exhaust gas flow path, and an actuator (18) for moving the valve member. Sensor structure (20) in the form of a pressure sensor or a temperature sensor is mounted upstream or downstream of the valve member in the exhaust gas flow path. The sensor structure is constructed and arranged to determine an operating condition of the valve member such as position of the valve member and/or whether the valve member has moved from one state to the other state.

Abstract: Exhausting apparatus for exhausting an internal combustion engine including an exhaust passage for flow of exhaust gases from the engine along an axis of the passage; one or more vanes mounted to an internal face the exhaust passage, said vanes being disposed in angular relationship to the axis of the passage and having a free edge spaced inwardly from and substantially coaxial with the internal face.

Abstract: The present invention discloses a method for reducing NOx in exhaust gases of an internal combustion engine. The purpose of this invention is to convert engine out NOx (approximately 90% NO in diesel exhaust) into roughly a 50:50 mixture of NO and NO2, while simultaneously oxidizing engine-out hydrocarbons which interfere with the reduction of NOx by urea or ammonia. The present invention demonstrates that a 50:50 blend of NO and NO2 is reduced more rapidly and with higher efficiency than a gas stream which is predominantly NO. In addition, catalyst in an engine exhaust that is a 50:50 mixture of NO and NO2 is far more resistant to hydrothermal deterioration than using NO alone. In another embodiment of the present invention, a vehicle exhaust system utilizing the method of the present invention is provided.

Abstract: One embodiment of the invention includes a product including a fuel-cell exhaust diffuser; an air funnel; and at least two exhaust tubes attached to the diffuser.

Abstract: A by-pass valve to regulate the passage of a gas towards two areas of a device, comprising a body coupled to said device, with an internal chamber in which the inlet gas is received through an inlet pipe, and two outlet pipes directed towards said areas and having a planar face with an access opening to its internal chamber through which there is inserted a planar plate on which the closing member and its actuation means are assembled, the closing member being duly positioned so as to close the outlet pipes.

Abstract: A manifold for a multicylinder internal combustion engine which includes a plurality of outlets (1) comprises upper, lower and central shells (15, 5, 51) that are connected with one another and define inlet channels and outlet spaces (63, 65). A baffle plate (35) is attached to different shells (5, 15) by means of a fixed/movable bearing and can expand thermally without transferring thermal stresses to the shells (5, 15).

Abstract: An exhaust system for an internal combustion engine includes an outer housing having a front shell and a rear shell, a prechamber in which exhaust gas from the combustion chamber enters, and an intermediate shell having a front and back as well as a catalytic converter holder. A catalytic converter element is arranged on the catalytic converter holder where an exhaust port directs exhaust gas from the catalytic converter element. To place the center of gravity of the exhaust system near the internal combustion engine or cylinder, the intermediate shell forms the prechamber and the exhaust port.

Abstract: In order to provide an exhaust system for a combustion engine with an outer casing in which hot exhaust gas is introduced through an exhaust inlet and discharged from an exhaust outlet wherein the exhaust outlet is of a tubular, more preferably having a circular or oval cross section design which, in a simple way, preferably effectively lowers the exhaust gas temperature in the exhaust outlet it is proposed that arranged in the area of the tubular exhaust outlet is an exhaust swirling device having at least one guide blade through which the exhaust gas is deflected in the exhaust outlet.

Abstract: The present invention describes an automobile exhaust pipes, and more particularly to an exhaust pipe capable of producing appropriate pressure to assist engine torque output when the engine is running at a low speed and expediting the waste gas to be discharged from an automobile when the engine is running at a high speed, so as to enhance the operating performance of automobile engines.

Abstract: A system for removing particulates from the exhaust gas of a vehicle internal combustion engine, particularly during those times that the emission of such particulates into the atmosphere would be of greatest danger to persons in the vicinity of the vehicle, includes a valve connected to the vehicle exhaust manifold for normally directing exhaust to the atmosphere when in the non-activated condition. The valve directs exhaust to a particulate filter when in the activated condition. Starting of the engine activates the valve for a predetermined period of time. The valve can be disabled manually or automatically by a switch, which detects the backpressure in the exhaust system. An exhaust pressure sensor monitors the exhaust backpressure, and a circuit device responsive to the exhaust pressure maintains the valve continuously in the non-activated condition, when the exhaust backpressure reaches a predetermined level for a predetermined period of time.

Abstract: A device and method for heating exhaust gas from the combustion of fossil fuel upstream of an emissions control device, especially a diesel particulate filter. A conduit receives an exhaust gas flow, and is in fluid communication with the emissions control device for supplying exhaust gas thereto. A flow straightener is disposed in the conduit, and a portion of the exhaust gas flows through the flow straightener. An igniter is disposed in the conduit between the flow straightener and the emissions control device for igniting fuel supplied thereto to produce a flame to heat the exhaust gas flow.

Abstract: The invention provides a NOx adsorber aftertreatment system for internal combustion engines which utilizes a plasma fuel converter operatively coupled to at least one NOx adsorber to aid in the regeneration of the NOx adsorber. Fuel and engine exhaust is injected into a plasma fuel converter upstream of a NOx absorber producing reductant such as H2, and CO, which are inlet into the NOx absorber. Reductants such as H2 and CO acting along and together help to efficiently regenerate the NOx Adsorber which in turn releases exhausts products such as CO2 and N2. Using the reductants generated by the plasma fuel converter NOx adsorbers, catalytic soot filter, and the like can be regenerated at exhaust temperatures less than 250° C. The plasma fuel converter, NOx adsorber regenerating aftertreatment system of the present invention may be used with any suitable control system.

Abstract: The diffuser can be used at an end of a vehicle exhaust system. The diffuser can have a generally hollow body with an inlet for receiving exhaust gasses from a substantially vertically-extending component of the vehicle exhaust system, and a substantially flat outlet grate through which the exhaust gasses are to be released to the atmosphere, the outlet grate being configured and adapted for use in a roof of the vehicle, in an aligned position therewith, with the hollow body of the diffuser positioned inside the vehicle and below the outlet grate.

Abstract: An exhauster for a motorcycle with a reduced number of components and reduced cost in a structure containing a variable passage area valve. An exhaust chamber has a box-shaped chamber main body, a plurality of expansion chambers a through c formed by sectioning the interior of the chamber main body with partitioning walls, and communication passages for connecting the expansion chambers a through c with one another. A variable passage area valve that controls passage area is contained in the communication passage.

Abstract: A component for a vehicular exhaust pipe includes an upstream venturi forming portion for creating at least a partial vacuum interior to the component. A downstream diverter housing portion of the component has an inlet coupled to an outlet of the venturi portion. The diverter housing portion includes the diverter element positioned adjacent an output of the diverter housing portion for forcing axially central exhaust flow radially outward toward a wall of the diverter housing. The partial vacuum in the component device causes colder environmental ambient air to enter an inlet of the component. The diverter also creates a mixture of hot exhaust flow with the colder environmental air, resulting in a lower temperature of the exhaust gas exiting the component and substantial elimination of centrally disposed exhaust hot spots.

Abstract: An expandable manifold comprises an expansion chamber defined by a resilient surface. Intake is provided by a conduit extending into the chamber. As reverse impulses resulting from the closing of an intake valve enter the expansion chamber from the output end of the chamber, the volume of the chamber increases as the resilient surface expands. The reverse impulses propagate along the inner surface of the resilient surface toward a void defined by the outer surface of the conduct and the inner surface of the resilient surface. When the intake valve reopens, the reverse impulse flow is redirected and combined with intake flow from the source of fuel/air. The reverse impulses are redirected within and proximate the void. Energy associated with the reverse flow is redirected and combined with the forward flow to improve overall engine performance.

Abstract: An exhaust system includes an exhaust tube for conveying a heated exhaust flow from an engine. A valve is mounted at least partially within the exhaust tube for noise attenuation. The valve includes a bias member mounted outside of the engine exhaust tube within a heat transfer environment to maintain the bias member at a low temperature. The bias member biases the valve against the heat exhaust flow toward a predetermined position. The valve is mounted within a section of the tube having a smaller cross-sectional area and pivots into a larger cross-sectional area section of the exhaust tube to avoid interference with tube walls and provide a relatively large range of movement.

Abstract: Method and device for a particle filter for an exhaust system for a combustion engine, wherein the filter is regenerated by spontaneous combustion of particles accumulated in the filter. Exhaust gases from the combustion engine are led, during operation, past the filter when the counterpressure in the exhaust gases which is caused by the filter exceeds a certain level. The invention also relates to a silencer in a vehicle which is driven by the combustion engine.

Abstract: The present invention provides a method of operating a dynamic exhaust system of a motorcycle engine. The method includes providing a valve in the exhaust system that is movable to direct exhaust gases between a first flow path through the exhaust system and a second flow path through the exhaust system. The method includes actuating the valve at a first speed to redirect exhaust gases from the first flow path to the second flow path and actuating the valve at a second speed greater than the first speed to redirect exhaust gases from the second flow path to the first flow path.

Abstract: A method of operating an engine for a vehicle having at least one cylinder and an exhaust passage communicatively coupled to the cylinder including at least one exhaust throttle disposed therein downstream of the cylinder, the method comprising of operating the cylinder to achieve controlled autoignition of an air and a fuel mixture within the cylinder, during a first transient condition, adjusting at least the exhaust throttle to maintain controlled autoignition within the cylinder, and during a second transient condition, adjusting at least an actuator other than the exhaust throttle to maintain controlled autoignition within the cylinder, where said first transient condition is of a shorter duration than said second transient condition.

Abstract: An apparatus for the reduction of nitric oxides (NOx) and particulate matter of exhaust emissions from a diesel engine having an electronic control module. The apparatus includes a first treatment device for reducing particulate matter and a second treatment device for reducing NOx emissions from the engine exhaust. The apparatus also includes a first valve in fluid communication with the exhaust inlet from the engine and a second valve in fluid communication with a common exhaust outlet. The first and second valves are in fluid communication with each other through a fluid connection extending therebetween.

Abstract: To provide an exhaust device for a motorcycle for suppressing an exhaust resistance due to the thickness of an exhaust control valve. An exhaust device for a motorcycle is provided for an engine having a plurality of cylinders. A plurality of upstream exhaust pipes are respectively connected to exhaust ports for the cylinders with an exhaust control valve provided in the downstream exhaust pipe. A separator is provided in the exhaust manifold portion for separating the flows of exhaust gas. The exhaust control valve is located on the downstream side of the separator so that a main surface of the exhaust control valve in its fully open condition becomes substantially parallel to a main surface of the separator.

Abstract: The invention concerns diesel particulate filter regeneration in an exhaust system of a vehicle having a diesel engine. The particulate filter regeneration is selectively accomplished by actuating a particulate filter backpressure valve located downstream of the diesel particulate filter. Exhaust noise is attenuated for both normal driving and regeneration modes of operation by directing the exhaust flow through different flow paths in a muffler downstream of the diesel particulate filter.

Abstract: A catalytic converter-incorporated exhaust system is provided, which includes an exhaust tube through which exhaust gases emitted from an engine flow, and a muffler fluidly connected with a downstream end of the exhaust tube. This muffler includes a muffler casing having a plurality of expansion chambers defined therein, an exhaust introducing passage for introducing the exhaust gases from the exhaust tube into the expansion chambers in succession, two catalytic converters mounted in an downstream portion of the exhaust introducing passage and operable to substantially purify the exhaust gases, and an exhaust composition detecting sensor disposed outside the muffler casing in the exhaust introducing passage.

Abstract: An exhaust valve for an exhaust component includes a shaft defining an axis and a flapper valve that is fixed to the shaft for rotational movement about the axis. The flapper valve is mounted within an interior cavity of a valve housing that is defined by an inner diameter. The flapper valve comprises a disc-shaped body that has a maximum flapper diameter that is less than the inner diameter. A unidirectional drive unit is used to move the flapper valve between open and closed positions such that the flapper valve only rotates in one direction about the axis.

Abstract: The invention concerns an internal combustion engine exhaust line comprising an active noise reduction system with variable choke device, continuously regulated based on the instantaneous discharge rate pulses of exhaust gases exiting from the internal combustion engine, including an expansion chamber for closing phases of the variable choke device arranged upstream of said active noise reduction system and a cavity dispersing medium and high frequencies arranged downstream of the active noise reduction system. The expansion chamber for the closing phases of the variable choke device is integrated in a first depolluting system arranged upstream of said active noise reduction system.

Abstract: An exhaust aftertreatment device has a turbulator provided by a tube having a perforated star-plugged downstream end.

Abstract: An exhaust manifold includes an open/close valve that switches between either closing or opening the exhaust path of a collection section, and switches the exhaust path of the exhaust gas between passing through or not passing through a bypass path containing an upstream catalyst. There is a partition wall structure in a pipe-mounting member so that when the valve is closed such that the exhaust gas during cold start is led to the upstream catalyst, the exhaust paths for each of the branch pipes on the upstream side of the valve inside a collection section are independent from one another. When the valve is closed, the downstream side of each of the branch pipes is not continuous inside the collection section, so the flow of air is prevented in this section, and exhaust interference and loss of exhaust heat are reduced.

Abstract: A fluid dosing device for introducing a fluid into a gas flow having a given flow direction, the dosing device comprising: input means for receiving the fluid from a source of fluid; nozzle means for injecting the fluid into the gas flow, the nozzle means comprising valve means arranged to move between a first position in which the valve means seals the nozzle means and a second open position in which injection of fluid into the gas flow can take place wherein the fluid dosing device is arranged to inject fluid into the gas flow in a direction having at least a component which is counter to the flow direction of the gas flow.

Abstract: The present invention relates to a balance pipe assembly for a vehicle exhaust system including at least a pair of exhaust pipes or pipe shaped portions, and a further pipe or pipe shaped portion extending between the exhaust pipes or pipe shaped portions so as to act as a balance pipe. The assembly further includes at least one of the exhaust pipes or pipe shaped portions including means adapted to reduce the pressure of exhaust gasses passing there through at a position downstream of the balance pipe or pipe shaped portion.

Abstract: In a diesel engine provided with a diesel particulate filter 81 and an exhaust throttle valve 9, noise is decreased that is produced when the exhaust throttle valve is returned back to the fully opened state after a diesel particulate filter 81 has been regenerated by oxidizing and removing the particulate matter deposited thereon. The exhaust system of the diesel engine is equipped with the diesel particulate filter 81 and a catalyst 82 on the upstream thereof, and is further equipped with the exhaust throttle valve 9 on the downstream. The diesel particulate filter 81 is regenerated by operating the diesel engine in a state where the exhaust throttle valve 9 is opened to a small degree. When the regeneration has finished, the diesel engine is run at a decreased rotational speed and, thereafter, the exhaust throttle valve 9 is returned back to the fully opened state.

Abstract: A lobed exhaust diffuser apparatus, system, and method configured to cool exhaust gases from an internal combustion engine comprises a diffuser having a proximal end, configured to receive exhaust gases from the engine, and a distal end, configured to expel the exhaust gases into the atmosphere. A plurality of lobes are disposed on the distal end such that at least a portion of the exhaust gases pass through the lobes, increasing the interaction surface area between the exhaust gases and the atmosphere, allowing for more rapid diffusion and entrainment between exhaust gases and atmospheric gases, resulting in more rapid cooling of the exhaust gases.

Abstract: Exhaust passage control valve 10 may comprise housing 30, valve member 20, and helical torsion spring 40. Housing 30 has an exhaust passage. Exhaust gas from an internal combustion engine flows through the exhaust passage of the housing 30. Valve member 20 opens and closes the exhaust passage of the housing. Helical torsion spring 40 may be disposed at the opposite side of the valve member from the housing side thereof. Helical torsion spring 40 comprises a coil part wherein spring wires have been wound in a coil shape, and arms formed at both ends of the coil part. The coil part may be disposed at approximately the center of the valve member. When the arms bend with respect to the coil part, the counter-force of this bending energizes the valve member towards a closing side. The spring mounting member may be arranged and constructed to adjust a position in which the spring mounting member is mounted on the housing such that a rotation angle of the arms can be changed.

Abstract: An exhaust purifying apparatus has an adsorbent capable of adsorbing hydrocarbons in an exhaust passage of an internal combustion engine, estimates the temperature of the adsorbent by repeated processing to estimate the current value by adding an added value to the previous estimated value, and changes the added value in response to the intake air amount and the ignition timing of the internal combustion engine.

Abstract: An exhaust flow director and catalyst mount for an internal combustion engine includes a collector chamber with an outlet flange adapted for direct connection with an exhaust treatment catalyst. A number of transitional guide vanes located within the collector chamber direct exhaust gases flowing from runners into the collector chamber. The runners attaching exhaust flanges and the outlet flange of the present device are substantially coplanar.

Abstract: A motorcycle exhaust system includes a catalytic converter (43) disposed within an exhaust passage (37) for discharging exhaust gas (G) from a multi-cylinder combustion engine (E) and operable to purify the exhaust gas (G). An upstream end of the catalytic converter (43) has different regions (S1 and S2) communicated with upstream exhaust passage portions (37a and 37a), respectively, and a downstream end of the catalytic converter (43) is communicated with downstream exhaust passage portions (37b and 37b) in a number equal to or smaller than the number of the upstream exhaust passage portions (37a and 37a). Also, the catalytic converter (43) has a partition wall (43c) extending in a direction of flow of the exhaust gas (G) for allowing the exhaust gas (G) from the upstream exhaust passage portions (37a and 37a) to flow through the catalytic converter (43) without being mixed together.

Abstract: A positioning control apparatus includes a position detector 102 which detects the position of a positioning object 101, a target position generator 103 which generates a target position signal based on an output from the position detector, and a driving unit 104 which drives the positioning object based on an output from the target position generator. The target position generator 103 includes a control unit which sets a temporary target position of the positioning object and performs the learning of a reference position of the positioning object. A control gain given to the driving unit includes a first control gain, which is valid until the positioning object reaches the set temporary target position, and a second control gain, which is smaller than the first control gain and which is valid after the time when the positioning object has reached the temporary target position until the reference position learning is completed.

Abstract: An engine body of the multiple-cylinder engine for an outboard motor can include a crankcase for supporting a crankshaft whose axis extends vertically, and plural cylinders that are vertically arranged in line, each cylinder horizontally extending outward from the crankcase, and each cylinder having a respective exhaust port formed in a cylinder head. There are can be provided plural exhaust passages, each passage extending from the downstream end of the exhaust port, each passage communicating with the exhaust port and expansion chambers. Each expansion chamber can communicate with the extending end of the exhaust passage.

Abstract: There is provided an exhaust pressure-adjusting valve that is brought into a closed position due to a biasing force of a resilient body and is opened against the biasing force of the resilient body due to the exhaust pressure in an exhaust channel, which is raised in response to the closing of a throttle valve, in which valve-opening area is increased or decreased according to the displacement of the resilient body, to thereby adjust the exhaust pressure. The exhaust pressure-adjusting valve has a unit for changing the growth rate of the valve-opening area, which gradually heightens the growth rate of the valve-opening area with respect to the displacement of the resilient body in a valve-opening direction.

Abstract: A device for active noise reduction has a chamber, which is arranged laterally in relation to a gas flow, and a chamber opening constructed in one wall of the chamber. In the area of the chamber opening, a deflection device is adjustably arranged. The deflection device, in a first position, at least partially directs the gas flow running by the chamber opening into the chamber, in order to compress air there, and, in a second position, directs the gas from the chamber to the gas flow, in order to release the gas inside the chamber. The resulting alternating pressure inside the chamber is radiated through the chamber opening as sound and overlays the disturbing sound.

Abstract: A wall-flow particulate trap system regenerated by reverse flow of filtered exhaust gas through porous walls of a plurality of tubular passages is disclosed. The system includes a particulate trap having an inlet and an outlet, the particulate trap adapted to receive engine exhaust gas; a mode valve assembly offset from the inlet of the particulate trap; a remote actuated relief valve offset from the outlet of the at least one particulate trap a duct rotor intermediate the particulate trap and the mode valve assembly, the duct rotor having a first end and a second end, the second end of the duct rotor in operative communication with the mode valve assembly and the first end of the duct rotor in fluid communication with the inlet of the particulate trap; and a rotor drive in driving connection with the duct rotor.

Abstract: The object of the invention is to customize the properties of the drive assembly of motor vehicles comprising an intake system, an exhaust system, and/or an internal combustion engine. For this purpose, the mechanical properties of a serial drive assembly, the engine parameters efficiency and rotational torque, and the acoustics of the serial intake and/or exhaust system are stored in a database in an initial step. Furthermore, the construction features of the serial drive assembly that can be customized are stored in the database with their variation parameters and limitations. After varying at least one construction feature, the modifications of the engine parameters resulting therefrom are calculated and stored as a parameter difference. Likewise, the resulting changes of the acoustic features are calculated and stored as sound difference. Thereafter, the original values of the serial drive assembly are overwritten with the difference values and reproduced acoustically.

Abstract: An exhaust gas distribution device for the engine of a vehicle, wherein said device incorporates means to control the evacuation of the gases towards a classical exhaust system or else towards a specific exhaust system, said specific exhaust system incorporating means to dilute and reduce the visible, sound and infrared signatures of said vehicle.

Abstract: An exhaust gas aftertreatment device for an internal combustion engine comprises an inlet configured to receive the exhaust gas, an outlet from which the exhaust gas exits the device, a first passageway defined between the inlet and the outlet, and a second passageway defined between the inlet and the outlet, wherein the second passageway is separate from the first passageway. A first aftertreatment element is disposed in the first passageway. In one embodiment, the device is a diesel oxidation catalyst device and the second passageway represents a bypass passageway. The second passageway may further have a second aftertreatment element disposed therein. In an alternative embodiment, the device is a NOx aftertreatment element, and a second aftertreatment element is disposed in the second passageway. In either case, the device includes an exhaust gas flow control mechanism configured to selectively control exhaust gas flow through the first and second passageways.