Abstract: Front and rear side flange portions of a filter accommodating cylinder are provided with positioning pins. A flange portion of an upstream cylinder is provided with a notched groove and a flange portion of a downstream cylinder is provided with a notched groove. In consequence, when the filter accommodating cylinder is connected between the upstream cylinder and the downstream cylinder, each of the positioning pins disposed at the front and rear flange portions is engaged with each notched groove of the upstream cylinder and the downstream cylinder. The filter accommodating cylinder can be positioned to be coaxial with the upstream cylinder and the downstream cylinder. As a result, after performing a cleaning operation to a DPF, an operation of once again connecting the filter accommodating cylinder between the upstream cylinder and the downstream cylinder can be quickly and easily performed.

Abstract: A modular exhaust system is disclosed for treating the exhaust from a fossil fuel powered prime mover; the exhaust system includes bricks, inserts placed inside of the bricks and funnels to direct exhaust through various flow paths in order to treat the exhaust.

Abstract: An exhaust treatment unit treats exhaust gas from an engine of a work vehicle. The exhaust treatment unit includes a diesel particulate filter device, a selective catalytic reduction device, a first support component and a second support component. The diesel particulate filter device treats the exhaust gas. The selective catalytic reduction device treats the exhaust gas. The first support component supports the diesel particulate filter device. The second support component supports the selective catalytic reduction device and the first support component. The first support component is detachable from the second support component.

Abstract: An exhaust gas aftertreatment device, including a bent exhaust pipe, a mixing pipe having a closed end at the exhaust pipe bend and a bell-shaped widened portion in at least partial contact with the exhaust pipe at its opposite end, and a nozzle connected to a receptacle in the mixing pipe closed end for injecting an additive into the exhaust gases, with a mixing zone in the exhaust pipe between the urea nozzle and the exhaust pipe outlet in which the exhaust gases flow around the mixing pipe symmetrically and form a double eddy in the mixing pipe.

Abstract: Arrangement for introducing a liquid medium into exhaust gases from a combustion engine, having a mixing duct, an injector for injecting the liquid medium into the mixing duct, and an inlet duct situated upstream of the mixing duct. The inlet duct has a first duct section which is annular in cross-section and a second duct section which is annular in cross-section. The second duct section is situated downstream of the first duct section and surrounds the mixing duct. The first duct section surrounds the second duct section. The mixing duct further has a flow reversal section via which an annular outlet of the first duct section is connected to an annular inlet of the second duct section and which is configured to reverse the direction of flow of the exhaust gases flowing through the inlet duct, to flow through the second duct section in a direction opposite to that of the exhaust gases in the first duct section.

Abstract: A device (10) for introducing air into a combustion chamber of an internal combustion engine (11) through an exhaust manifold (14) of the engine includes a generally cylindrical valve body (12) supportable at an inner axial end in a hole formed through an engine exhaust manifold wall (13). A main fluid pathway (16) is formed within the valve body and extends between an intake (18) adjacent an outer axial end of the valve body and an exhaust opening (20) at the inner axial end of the valve body. A one-way check valve (22) is carried in the main fluid pathway and is configured to allow fluid flow along the main fluid pathway from the intake toward the exhaust opening and to block fluid flow along the main fluid pathway from the exhaust opening toward the intake.

Abstract: A mixing system is provided. The mixing system includes a housing defining a boundary of a mixing conduit including an expansion section with an injector mount and a reductant diverter extending into the conduit upstream of the injector mount in the expansion section. The mixing system further includes an atomizer with openings positioned in the housing and a helical mixing element positioned in the housing.

Abstract: A solid SCR system includes solid state reductant, a container storing the solid state reductant, an exhaust pipe supplying gas state reductant converted from the solid state reductant and SCR catalyst disposed on the exhaust pipe, an exhaust heat recovery device disposed on the exhaust pipe and recovering waste heat from exhaust gas exhausted through the exhaust pipe and a heat exchanger connected to the exhaust heat recovery device and supplying the recovered heat to the solid state reductant.

Abstract: An exhaust heat recovery apparatus includes a joining section extending from a downstream end portion of a second flow passage section to a first flow passage section. The joining section has a communication port formed proximate a valve shaft for directing an exhaust gas from the second flow passage section into a housing section. A valve includes a first valve body supported by the valve shaft for closing a downstream end portion of the first flow passage section, and a second valve body extending from the first valve body for closing the communication port. The first valve body and the second valve body are disposed circumferentially of the valve shaft. The second valve body has an arc-shape having a center provided by the valve shaft.

Abstract: In order to relief a sudden change of engine sound during the transition to recovery control of a particulate removing filter or during returning from the recovery control, a system of treating exhaust gas of an engine includes an exhaust-gas particulate removing filter in an exhaust path, closes down the opening of an inlet throttle valve or an exhaust throttle valve to a recovery opening smaller than a normal opening during recovery of the particulate removing filter, and returns the opening from the recovery opening to the normal opening after the recovery of the particulate removing filter. The opening of the inlet throttle valve or the exhaust throttle valve during the closing process from the normal opening to the recovery opening and during the returning process from the recovery opening to the normal opening is changed at a gradually decreasing or gradually increasing rate of change of the opening.

Abstract: A fitting portion structure of a device for post-processing exhaust gas in an agricultural operation vehicle is provided. The device is arranged in parallel to the lengthwise direction of an engine at the upper portion of an exhaust manifold of the engine, an exhaust gas inlet is coupled to the exhaust manifold or to a turbo charger and a flange pipe which are located at the lower portion of the exhaust gas inlet, and a fixing means is arranged between the engine and the device to support the load of the device. The fixing means includes a frontal bracket arranged between a cylinder head on the front side of the engine and a DPF canning of the device, and a rear bracket arranged between a cylinder head on the rear side of the engine and a flange coupling portion of the flange pipe.

Abstract: An exhaust system for an off-road vehicle including an outlet port configured to release exhaust gas and an outlet stack disposed about the outlet port, in which at least a portion of the outlet stack is radially spaced from the outlet port to form a gap between the outlet stack and the outlet port. The outlet stack is configured to direct a flow of exhaust gas from the outlet port toward a distal end of the outlet stack. The exhaust system further includes an exhaust shield in close proximity or coupled to the outlet stack comprising at least one opening and an electronic control unit (ECU) disposed within the exhaust shield. The gap is configured to establish an airflow path from the at least one opening to a region of the outlet stack downstream from the outlet port, and the ECU is positioned within the airflow path between the at least one opening and the gap to facilitate cooling of the ECU.

Abstract: A device for producing electrical energy from the exhaust gas of an internal combustion engine, includes a generator with an exhaust gas inlet connection, an exhaust gas outlet connection and at least one heat exchange section therebetween. At least one flow diversion and/or flow division is provided between the exhaust gas inlet connection and the heat exchange section. The heat exchange section has a plurality of flow paths perpendicular to the exhaust gas inlet connection, to be assigned to a plurality of heat exchange units. At least a portion of the heat exchange assembly has at least one thermoelectric element and a cooling device. The at least one thermoelectric element is captively connected to the cooling device. A motor vehicle having the device is also provided.

Abstract: An exhaust system component (1), for an exhaust system of an internal combustion engine, includes a metallic first part (3), which is inserted into a metallic second part (2), such that an inner jacket section (7) of the first part (3) is arranged coaxially in an outer jacket section (5) of the second part (2), as well as at least one weld joint (10), which permanently connects the outer jacket section (5) to the inner jacket section (7). To simplify the assembly of the parts (2, 3) with one another, a plurality of centering contours (11, 12) are formed integrally on the outer jacket section (5), projecting inwardly, and/or are formed integrally on the outer jacket section (7), projecting outwardly, and are located at spaced locations from one another in the circumferential direction (6). The centering contours center the inner jacket section (7) in the outer jacket section (5).

Abstract: A mixing device includes: a cylindrical portion having a blade provided inside thereof for mixing exhaust gas that flows inside of an exhaust pipe of an internal combustion engine, with an additive sprayed into the exhaust pipe by an adding valve; a flange having an insertion hole, into which the cylindrical portion is inserted, and extending outward in a radial direction of the cylindrical portion from an outer peripheral surface of the cylindrical portion; and a plurality of supporting portions that are provided on the flange and that support the cylindrical portion, wherein each of the supporting portions includes an extending piece that extends in a circumferential direction of the cylindrical portion from a base end portion connected to the flange.

Abstract: A mounting foot for mounting an after-treatment component to a frame is disclosed. The mounting foot may have a pad connectable to the frame. The mounting foot may also have a slider slidably connected to the pad. In addition, the mounting foot may have a mounting bracket. The mounting bracket may have a first end connectable to the after-treatment component and a second end connected to the slider.

Abstract: An internal combustion engine has an exhaust treatment system with a fluid injection system and a swirl can plenum mixer for mixing injected fluid with exhaust gas exhausted from the engine. The mixer comprises a canister having an inner plenum. A bulkhead separates the inner plenum into an exhaust gas collector and a diffuser chamber. A flow port opens through the bulkhead to a tangential flow director on the downstream side of the bulkhead to collect the exhaust gas. A fluid injector port receives a fluid injector for dispensing a fluid into the exhaust gas for mixing with the exhaust gas in the swirl can plenum mixer. A tangential flow director nozzle is configured to dispense the exhaust gas and fluid into the downstream plenum in a tangential flow trajectory, wherein mixing and vaporization of the exhaust gas and fluid mixture with the exhaust gas is accomplished.

Abstract: An exhaust conduit for a diesel engine is disclosed. The exhaust conduit may include a tubular body having a cylindrical side wall, and a plurality of plates arranged substantially parallel with one another and disposed within the tubular body. The exhaust conduit may further include a boss protruding from the side wall of the tubular body. The boss may include an opening configured to receive an injector device, wherein the plates and the boss are aligned such that a line extending along a central axis of the opening is substantially perpendicular to the plates.

Abstract: Exhaust pipe or exhaust stack 3a extending vertical from the trucks diesel engine is modified with a slot to reduce back pressure. This pressure reduction enables the engine to operate more efficiently resulting in improved fuel economy.

Abstract: The present invention relates to an exhaust-gas turbocharger (1) having a turbine housing (2) and having a manifold section (3) which is connected to the turbine housing (2), wherein the turbine housing (2) and the manifold section (3) are formed as a single-piece cast part.

Abstract: A method for producing an exhaust gas cleaning component having a carrier structure with an inflow side, an outflow side, a predefined through-flow direction and a deflection surface disposed opposite the outflow side, includes at least the following steps: providing the carrier structure, subjecting the carrier structure to an exhaust gas flowing from the inflow side to the outflow side in the predefined through-flow direction, determining a distribution of flow velocities on the outflow side of the carrier structure, and configuring the shape of the deflection surface with at least one backpressure element in dependence on the distribution of flow velocities on the outflow side, so that the distribution of flow velocities is equalized. An exhaust gas cleaning component and a motor vehicle having the exhaust gas cleaning component are also provided.

Abstract: An exhaust treatment device includes first and second substrates positioned in parallel within a housing. A baffle plate supports the substrates, an inlet tube and an outlet pipe, and defines a portion of a first chamber. First ends of the substrates and a second end of the inlet tube is in fluid communication with the first chamber. A partition supports the substrates, the inlet tube and the outlet pipe and defines a portion of a second chamber separate from first chamber. Second ends of the substrates and a second open end of the outlet pipe is in fluid communication with the second chamber. All of the exhaust flows in a first direction through the inlet tube, reverses direction through the substrates and reverses direction again to flow through the outlet pipe.

Abstract: A controlling method for adjusting concentrations of, for example, individual cylinder's exhaust gas constituents to provide engine functions such as catalytic converter diagnosis, increased overall catalytic converter efficiency and rapid catalyst heating, before and/or after initiating closed loop fuel injection control, using a selected temperature sensor location within a low thermal mass catalytic converter design.

Abstract: An exhaust pipe arrangement for discharging exhaust from a combustion engine through an exhaust pipe is provided, particularly for a combustion engine with an exhaust gas aftertreatment system requiring high temperatures in one or more operational modes. The arrangement includes an end section terminated by an exhaust gas outlet. A diffuser section is provided in the exhaust pipe, the diffuser section having a first end in a distance from the outlet and a second end closer to the outlet is arranged in vicinity of the outlet, wherein at least one vane with an airfoil profile extends in an axial direction from the first end to the second end of the diffuser section.

Abstract: An exhaust treatment unit includes an exhaust treatment device that treats exhaust gas from an engine of a work vehicle, a bracket including an attachment portion attachable to a hoisting hook, and a detachable component. The bracket supports the exhaust treatment device. The detachable component is attachable to and detachable from the attachment portion. When the unit is attached, the hoisting hook is attached to the attachment portion, the unit is hoisted using a hoisting tool including the hoisting hook, moved to an attachment position and installed in the work vehicle. The hoisting hook is then detached from the attachment portion and the detachable component is attached to the unit using the attachment portion. When the unit is detached, the detachable component is detached from the attachment portion, the hoisting hook is attached to the attachment portion, and the unit is hoisted and detached using the hoisting tool.

Abstract: The present disclosure is directed to a system for reducing the cold start time for a vehicle with a twin fuel engine. The system has an exhaust system, from which exhaust is discharged and collected on an exhaust manifold. A heat exchanger is positioned within the exhaust system, with coolant flow passages in thermal communication with the engine, and the heat exchanger. A control valve is coupled to a first flow path operable to direct the exhaust through the heat exchanger across the first flow path and a second flow path in selective amounts.

Abstract: An arrangement for fitting an exhaust cleaning unit (2) in an exhaust passage (1b): An annular resilient component (7) is fitted around the exhaust cleaning unit (2) at a distance from a gasket (5). The annular resilient component (7) has a first contact portion (7a) which comes into contact with a wall surface (3) of the exhaust cleaning unit (2) and a second contact portion (7b) which comes into contact with a wall surface (1b) of the exhaust passage when the exhaust cleaning unit (2) is in a fitted state in the exhaust passage. The annular resilient component (7) keeps the exhaust cleaning unit (2) in a centered position in the exhaust passage with a spring force.

Abstract: A mixer is disclosed for use in a fluid injection system. The mixer may have an impingement floor oriented generally perpendicular to an intended fluid injection direction and generally parallel with a flow direction. The mixer may also have a first side wall connected along a lengthwise edge of the impingement floor and generally parallel with the flow direction, and a second side wall connected along an opposing lengthwise edge of the impingement floor and generally parallel with the flow direction. The mixer may further have at least one shelf extending between the first and second side walls and generally parallel with the flow direction. The at least one shelf may have a plurality of vanes protruding toward and away from the impingement floor that promotes mixing of an injected fluid.

Abstract: The invention relates to an internal combustion engine system (1), particularly in a motor vehicle, comprising an internal combustion engine (2), a fresh gas system (3) for supplying fresh gas to the internal combustion engine (2), an exhaust gas system (4) for discharging exhaust gas from the internal combustion engine (2), and an exhaust gas recirculation system (5) for removing exhaust gas from the exhaust gas system (4) at a removal point (11) and introducing the removed exhaust gas into the fresh gas system (3) at an introduction point (12). In order to improve exhaust gas recirculation, the exhaust gas system (4) is equipped with an exhaust gas valve (14) downstream of the removal point (11) in order to control the penetrable cross-section of the exhaust gas system (4).

Abstract: Methods and systems are provided for expediting catalyst heating and generating vacuum by controlling an EBV to direct exhaust through an ejector arranged in parallel with the EBV. A position of the EBV may be controlled to achieve a desired exhaust backpressure for current engine operating conditions and stored vacuum level. Compensation for the effect of EBV position on engine airflow may be provided by adjustment of other parameters such as intake throttle position and spark timing.

Abstract: In an engine system with a reformer being installed in an exhaust pipe to reform a fuel, a control valve for controlling a flow rate of exhaust gas is provided downstream from an installed position of the reformer in the exhaust pipe. In the engine system with the reformer, since a part of the exhaust gas can be trapped in a space between the reformer and an engine chamber by closing the control valve during an exhaust stroke, the reforming efficiency of the reformer can be heightened.

Abstract: A thermoelectric generator for a vehicle is mounted at an exhaust pipe and produces electricity using a temperature difference between the exhaust gas and coolant. The generator includes: a housing; thermoelectric modules mounted at an outer circumferential surface of the housing; a plurality of coolant tubes mounted so as to closely attach the thermoelectric module to the housing; first coolant containers mounted at both ends of the coolant tubes, respectively; and second coolant containers mounted at both ends of the coolant tubes, respectively. The coolant tubes are assembled to the first and second coolant containers as a modularized type, and thus assemblability may be improved and partial replacement of components in case of breakdown may be easily performed. In the coolant tube of the present invention, heat exchange is concentratedly performed at a portion in contact with the thermoelectric module, and thus generation efficiency may be more improved.

Abstract: The invention relates to an exhaust-gas treatment device (10), comprising a) an outer tube (14) through which an exhaust-gas stream (12) can flow, b) an inner tube (20) that is arranged in a first section (16) of the outer tube (14) and that divides the interior of the first section (16) into a central flow path (22) and a peripheral flow path (24), whereby a first exhaust-gas treatment means (26) is arranged in the central flow path (22) and/or in the peripheral flow path (24), c) means (30, 32) to selectively convey an exhaust-gas stream via the central flow path (22) and/or via the peripheral flow path (24), and d) a second exhaust-gas treatment means arranged in a second section (18) of the outer tube (14) downstream from the first section (16).

Abstract: A process for producing a diffusion barrier or blocking layer includes providing aluminum oxide on a metal sheet formed of a base material including at least iron, chromium and aluminum. A process for producing an exhaust gas treatment unit includes providing a honeycomb body and a housing in which at least one of the honeycomb body or the housing is formed of the metal sheet and the metal sheet is formed of a base material including at least iron, chromium and aluminum. The metal sheet thus includes, at least in a subregion, a surface layer including at least aluminum oxide and a metal from the group including cobalt and nickel. An exhaust gas treatment unit and a motor vehicle are also provided.

Abstract: Disclosed is a burner device that includes a partition member which air-permeably partitions an ignition region for igniting a mixture gas and a flame retaining region for maintaining the combustion of the mixture gas, and also adjusts the flow speed of the mixture gas supplied from the ignition region to the flame retaining region, the partition member including a protrusion portion that protrudes into an oxidant flow passage and stops a part of the oxidant flowing through the oxidant flow passage to guide the oxidant into a take-in passage region.

Abstract: An exhaust system for an internal combustion engine having a first exhaust tract assigned to a first group of cylinders of the internal combustion engine, and a second exhaust tract assigned to a second group of cylinders of the internal combustion engine, the first exhaust tract and the second exhaust tract being coupled to one another by a connecting line. A common bypass line branches off from the connecting line coupling the exhaust tracts.

Abstract: Fuel efficiency in a combustion engine is increased by treating the fuel in a reaction chamber prior to delivering the fuel into the combustion chamber of the engine. The method includes the step of entraining a stream of exhaust gas to travel upstream through the reactor chamber in a first flow pattern. The method also includes the step of entraining a stream of fuel to travel downstream through the reactor chamber in a second flow pattern, where at least one of the first and second flow patterns comprises a structured turbulent flow.

Abstract: The assembly for purification of exhaust gases comprises an upstream conduit and a downstream conduit positioned parallel to each other. A space has an exhaust gas inlet communicating with the upstream conduit and an exhaust gas outlet communicating with the downstream conduit. A middle line divides the inlet into first and second areas providing a same passage section to the exhaust gases. The assembly comprises a baffle covering at least 75% of the first area and covering less than 25% of the second area. The baffle and the space are laid out so that a portion of the exhaust gases penetrate through the first area of the inlet flows into the space along flow lines forming a cusp around the baffle.

Abstract: Exhaust routing devices are disclosed that include (a) a body defining an exhaust routing chamber, the body having an intake port configured to provide fluid communication between the exhaust port of a cylinder head and the chamber, and two outlet ports configured to provide fluid communication between the chamber and first and second exhaust pipes; and (b) a gate, mounted within the chamber to pivot between a first position, in which the gate occludes one of the outlet ports, and a second position, in which the gate occludes the other outlet port. Exhaust routing systems and method of using them are also disclosed.

Abstract: A method for causing exhaust gas flow to flow at least 270 degrees in a first direction about a perforated tube using a baffle plate having a main body with a plurality of flow-through openings and a plurality of louvers positioned adjacent to the flow-through openings. The method includes deflecting a first portion of the exhaust gas flow with the main body of the baffle plate. The method also includes allowing a second portion of the exhaust gas flow to flow through the flow-through openings of the baffle plate. The method also deflects the second portion of the exhaust gas flow at a downstream side of the main body with the louvers hereby causing the second portion of the exhaust gas flow to flow in the first direction about the perforated tube.

Abstract: A mixer configuration for mixing an additive with an exhaust gas stream includes at least one overflow surface which is disposed in a mixing section of an exhaust pipe. The exhaust pipe has a cross section and a main flow direction of the exhaust gas stream. The at least one overflow surface is disposed centrally in the mixing section, is directed along the main flow direction of the exhaust gas stream and has a multiplicity of closed depressions. The mixer configuration permits an excellent mixture of the exhaust gas stream with an additive, without generating a high flow resistance in the process. A motor vehicle having a mixer configuration is also provided.

Abstract: An exhaust gas apparatus suppresses sound pressure level from increasing, and reducing its weight and production cost without need of a sub-muffler in a tail pipe and a sound deadening device having an air column resonance of a large capacity provided at the upstream opened end of the tail pipe. The exhaust gas apparatus is provided with an exhaust gas pipe, an upstream opened end connected to the sound deadening device positioned at the upstream side of an exhaust gas discharging direction, and a downstream opened end through which the exhaust gas is discharged to the atmosphere. A plate is provided at least one of the upstream opened end and the downstream opened end in opposing relationship with the exhaust gas discharging direction, and formed with an opened portion. The exhaust gas pipe is formed at its peripheral wall axially inwardly spaced apart from the plate with a through bore.

Abstract: A method and device for removing a minor portion of carbon dioxide from the exhaust gases of a motor vehicle, wherein less than 20 percent of the carbon dioxide is removed, and further wherein exhaust flow is not impeded such that there is no significant reduction in efficiency of the motor itself.

Abstract: A static mixer for an exhaust gas system of an internal combustion engine with which at least two different fluid streams are mixed almost homogeneously after a short mixing distance, and with which back-flow effects and pressure losses are avoided, to the greatest possible extent. Due to the placement of flow guide devices, the inclined front sections of which are disposed alternately facing in different directions, and by the configuration and placement of the fluid passage spaces, which are delimited by guide elements, intensive and homogeneous mixing of two different fluid streams is achieved, while avoiding turbulent flows and pressure losses. Mixing of the fluid streams is supported by guide vanes that are disposed on the flow guide elements in the front region of the central center element, and on a frame that delimits the inclined sections of the flow guide elements.

Abstract: A mixing system is provided. The mixing system includes a housing defining a boundary of a mixing conduit including an expansion section with an injector mount and a reductant diverter extending into the conduit upstream of the injector mount in the expansion section. The mixing system further includes an atomizer with openings positioned in the housing and a helical mixing element positioned in the housing.

Abstract: An exhaust system for treating an exhaust gas composition having NO2 in a first NO2 concentration. The exhaust system includes a first catalyst that contacts a first portion of the exhaust gas composition converting it into a first oxidized exhaust mixture that includes NO2 in a second NO2 concentration that is greater than the first NO2 concentration. The system further includes a bypass that receives a second portion of the exhaust gas composition and a recombination section positioned downstream of the first catalyst. The first oxidized exhaust mixture is combined with the second portion of the exhaust gas composition to produce a first combined exhaust gas mixture. A second catalyst converts the first combined exhaust gas mixture to a second combined exhaust gas mixture having a third NO2 concentration that is less than the second NO2 concentration. The method used by the exhaust system is also provided.

Abstract: A mounting assembly for an injector is located in a curved portion of an exhaust line having an exhaust flow from an upstream end to a downstream end. The mounting assembly includes an indent extending at least partially into the exhaust line curved portion and disposed in the exhaust flow. The downstream wall has an interior surface oriented to substantially face the exhaust line downstream end. A recess extends from the downstream wall in a direction away from the exhaust line downstream end, and a recess aperture is formed in the recess and configured to fluidly communicate with the injector. The recess reduces the amount of exhaust heat reaching the injector tip.

Abstract: Disclosed herein is an SCR system of a vessel for discharging exhaust gas from an exhaust gas source in the vessel to an outside after performing purification of the exhaust gas. The SCR system includes an SCR reactor connected at a leading end thereof to the exhaust gas source and including a catalyst activated by the exhaust gas introduced into the SCR reactor, a reducing agent supply line supplying NH3 or urea into the SCR reactor, and a bypass system forcing the exhaust gas discharged from the exhaust gas source to bypass the SCR reactor.

Abstract: A device for an exhaust system of a motor vehicle includes baffle wall, a passage, and a body having a sidewall with an exhaust conduit extending therethrough. The baffle wall has a bore in fluid communication with the exhaust conduit. The baffle wall extends from the sidewall and into the exhaust conduit for directing the flow of exhaust gas through the bore and increasing a speed of the flow of the exhaust gas. The passage extends through the sidewall of the body for fluid communication between the bore and an ambient environment. As such, the increased speed of the flow of the exhaust reduces the pressure and creates a venturi for drawing cool ambient gas into the flow of the hot exhaust gas. In addition to the venturi, the bore and the passage collectively generate a desirable engine exhaust sound when the flow of the exhaust gas passes therethrough.

Abstract: An exhaust emission control system for an engine that provides both early activation of a catalyst during cold-engine, low-load operation of the engine and protection of the catalyst during hot-engine, high-load operation of the engine. The exhaust emission control system includes a catalyst provided in an intermediate portion of an exhaust pipe; an exhaust valve provided in an upstream-side exhaust passage of the exhaust pipe between the catalyst and the engine; and an auxiliary exhaust passage, which is smaller in passage cross-sectional area than the upstream-side exhaust passage and is connected to the upstream-side exhaust passage so as to bypass the exhaust valve. The auxiliary exhaust passage has an inlet connected in the vicinity of an exhaust port of the engine and an outlet connected to the vicinity of the catalyst.