Abstract: A method for operating an internal combustion engine with compression ignition or with spark ignition as a function of an operating point. A specific residual exhaust-gas quantity in the combustion space is set for compression ignition. The internal combustion engine is operated as a function of the operating point by an outlet cam, by which a first outlet opening phase and a second outlet opening phase take place. The second outlet opening phase commences during an inlet opening phase. At a first operating point in a compression-ignition mode, a residual exhaust-gas quantity in a combustion space is dimensioned as a function of a valve interference set between the inlet and the outlet valve during a charge exchange. At a second operating point in the compression-ignition mode the residual exhaust-gas quantity in the combustion space is dimensioned as a function of a duration of the second outlet opening phase.

Abstract: Disclosed herein is a method and an exhausting apparatus for an internal combustion engine including: a central exhaust passage; a first expansion chamber in an upstream portion of the exhaust system and in fluidic communication with the central exhaust passage; a second expansion chamber in a downstream portion of the exhaust system and in fluidic communication with the central exhaust passage and the first expansion chamber, forming a continuous expansion chamber throughout a length of the exhausting apparatus.

Abstract: An exhaust gas system includes an exhaust gas pipe with an integrated evaporator. In order to make the evaporator independent of the site of installation and the mounting position, a capillary structure is arranged between the outer sleeve pipe and the exhaust gas pipe. For increasing the efficiency of the evaporator, vapor grooves are provided in an area of an outer sheath surface of the exhaust gas pipe and fluid grooves are provided in an area of an inner mantle surface of the sleeve pipe.

Abstract: An exhaust gas system for combustion engines is provided having at least one exhaust gas duct, in particular an exhaust pipe, and having an exhaust gas treatment device such as an oxidation catalyst, an SCR catalyst or a diesel particulate filter downstream of the exhaust gas duct, wherein, to improve the efficiency of downstream gas treatment devices, at least one secondary flow duct, in particular a secondary flow pipe, is provided in the exhaust gas duct with a cross-section reduced with respect to the exhaust gas duct which imparts coerced guidance of some of the exhaust gas flow differing from the actual exhaust gas flow.

Abstract: An exhaust line of an internal-combustion engine contains a catalyst and a bypass pipe bypassing the catalyst. The bypass pipe can be shut-off by way of a shut-off valve. The shut-off valve has a diagnostic device for diagnosing a tightness of the shut-off valve.

Abstract: A muffler for an internal combustion engine exhaust system includes a housing having an inlet and outlet headers enclosing opposite ends of an outer shell. A partition divides a housing interior into first and second chambers, the first chamber having sound absorbing material positioned therein. The partition has an aperture allowing fluid communication between the first and second chambers. A through pipe extends through the inlet and outlet headers and the partition and has a plurality of perforations enabling fluid communication between the through pipe and the first chamber. A valve assembly has a valve flap positioned inside the through pipe for rotation with an axle pivotally coupled to the pipe between a closed position and an open position. The valve is positioned downstream of the pipe perforations such that all of an exhaust gas flowing through the muffler passes through the valve regardless of the valve flap position.

Abstract: The invention provides a muffler assembly (10) for exhaust gas flow communication with an engine exhaust. The assembly (10) includes a muffler (12) having inlet and outlet ports (14, 16). The assembly (10) also includes first and second flow of passages in common fluid communication with the outlet port (16) and in variable fluid communication with the inlet port (14). The first and second flow passages meet at first and second connecting points. The first connecting point is located in the proximity of the inlet port (14). The first flow passage has a higher resistance to fluid flow than the second flow passage. The assembly (10) also includes a valve means (24) generally located past the first connecting point inside the second flow passage for selectively proportionating exhaust gases passing through the passages. The first flow passage includes three or more conduits (26, 28, 30) being in fluid communication with each other.

Abstract: A system for trapping liquid exhaust during a cold start of an internal combustion engine is provided. As one example, a system includes, an exhaust inlet, an exchange area fluidly coupled downstream of said exhaust inlet, a trap coupled to said exchange area having a liquid exhaust chamber for collection of liquid exhaust, and a catalytic converter fluidly coupled downstream to said exchange area. In another example, a method includes condensing, at least partly, exhaust from the engine in an exchange area in an exhaust system into liquid exhaust, collecting liquid exhaust into a trap disposed in the exchange area, and evaporating the liquid exhaust into the exchange area after an evaporation temperature is reached in the trap.

Abstract: An exhaust aftertreatment system is provided. The exhaust aftertreatment system includes a mixing arrangement for mixing flows of exhaust along a flow path. The mixing arrangement radially and angularly rearranges segments of two different portions of flow to mix the different portions of flow. The mixing arrangement initially converts a generally radially stratified temperature profile into an angularly stratified temperature profile to increase surface area between cool segments of exhaust gas and hot segments of exhaust gas. The aftertreatment system may also include a combustion chamber, a combustor housing and a combustor liner. The mixing arrangement is downstream from the combustion chamber to direct radially outward hot gas passing through the combustor liner and to direct radially outer cool gas passing between the liner and the combustor housing radially inward in an interleaving fashion.

Abstract: An exhaust control device for a vehicle engine wherein an exhaust pipe forms an exhaust passage along with an exhaust port is connected to a cylinder head via the exhaust port. A rotary valve is capable of changing the opening area of the exhaust passage. The rotary valve being disposed in approximately the middle of the exhaust passage. The opening area of the exhaust passage is made controllable by the rotary valve while avoiding an increase in the number of component parts. A rotary valve having a turning axis located at a position offset from the center of the exhaust port is housed in a valve housing provided integrally with a cylinder head.

Abstract: A nodular graphite, heat-resistant cast iron composition for use in engine systems. The composition contains carbon 1.5-2.4 weight %, silicon 5.4-7.0 weight %, manganese 0.5-1.5 weight %, nickel 22.0-28.0 weight %, chromium 1.5-3.0 weight %, molybdenum 0.1-1.0 weight %, magnesium 0.03-0.1 weight %, and a balance weight % being substantially iron. The composition has an austenitic matrix. Additionally, the composition exhibits excellent oxidation resistance at high temperature and excellent mechanical properties at both room and high temperatures. Thus, the composition can be a lower cost substitute material for Ni-Resist D5S under thermocycling conditions experienced by exhaust gas accessories and housings such as engine exhaust manifolds, turbocharger housings, and catalytic converter housings.

Abstract: An exhaust heat recovery apparatus is installed below a floor supported by both side members of a vehicle to recover heat from exhaust gas passing through an exhaust pipe of an internal combustion engine. Assistance members, which extend in the fore-and-aft direction of the vehicle, are provided between the both side members of the vehicle. The exhaust heat recovery apparatus is installed close to one of the assistance members.

Abstract: In a structure of an additive-agent diffusion plate in an exhaust passage, the exhaust passage is an exhaust passage for an engine. The additive-agent diffusion plate includes a plurality of collision portions; and a plurality of communication portions that allow exhaust gas flowing in the exhaust passage to flow from an area upstream of the additive-agent diffusion plate to an area downstream of the additive-agent diffusion plate in an exhaust-gas flow direction. The additive-agent diffusion plate diffuses an additive agent injected into the exhaust passage, at a position upstream of an exhaust gas purification device, which is disposed in the exhaust passage, in the exhaust-gas flow direction. Each of the collision portions protrudes toward an upstream side in the exhaust-gas flow direction, and a cross section of each of the collision portions increases from the upstream side toward a downstream side of the exhaust-gas flow direction.

Abstract: A valve assembly may include a valve body, a valve member, and a valve shaft. The valve body may include an inlet, an outlet, and first and second fluid paths in fluid communication with the inlet. The first fluid path may extend axially through at least a portion of the valve body. The second fluid path may be defined by first and second annular walls and may at least partially surround the first fluid path. The valve member is disposed in the valve body and may be movable between a first position preventing fluid flow through the first fluid path and a second position allowing fluid flow through the first fluid path. The valve shaft may be fixed to the valve member and mounted to the valve body for rotation relative to the valve body.

Abstract: An exhaust gas treatment system for reducing emissions from an engine includes an exhaust conduit adapted to supply an exhaust stream from an engine to an exhaust treatment device. An injector injects a reagent through an aperture in the conduit into the exhaust stream. A vortex breaker includes a mount having a cylindrical sleeve extending through the aperture as well as a flared tube fixed to and positioned within the cylindrical sleeve. A window extends through an upstream portion of the cylindrical sleeve exposing the flared tube to the exhaust stream. The sleeve includes a downstream aperture in fluid communication with the window.

Abstract: A single-wall manifold having an engine flange, an outlet flange and manifold pipes which are connected at their one end to the engine flange and at their other end to the outlet flange, with a load-transferring connection being provided between the engine flange and the outlet flange in addition to the manifold pipes to improve the load transfer between the outlet flange and the engine flange.

Abstract: An annular heat exchanger for cooling hot gases comprises an inner shell, an intermediate shell and an outer shell. Where the heat exchanger is integrated with a catalytic converter for treatment of hot exhaust gases in a motor vehicle, the inner shell contains a catalyst for treatment of the exhaust gases. Inner and outer gas flow passages are provided between the shells, and a coolant flow passage is provided, either on the outer surface of the outer shell, or between the intermediate and outer shells. The exhaust gases change direction twice as they pass through the heat exchanger, and the annular structure of the heat exchanger provides a large surface area, and a large flow section, relative to volume, and thereby provides effective heat exchange without significantly increasing space requirements.

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 having a second exhaust tract assigned to a second group of cylinders of the internal combustion engine, each exhaust tract comprising an exhaust gas purification device, a first silencer arranged on the outlet side of the respective exhaust gas purification device, and a second silencer arranged on the outlet side of the respective first silencer. Each exhaust tract includes a bypass line, it being possible for exhaust gas to be diverted via each bypass line, starting from the respective first silencer, bypassing the second silencers, and the bypass lines and hence the first silencers of both exhaust tracts being connected to one another by a mixing line.

Abstract: A variable exhaust gas flow deflector for an internal combustion engine is disclosed. The deflector can include a blade located at least partially within an exhaust gas flow of the engine, the blade having a first position and a second position. The blade can move between the first position and the second position as a function of at least one parameter and/or condition of the exhaust gas and/or the internal combustion engine.

Abstract: The invention relates to an exhaust component in a gas exhaust line for gases produced by the combustion of a fuel in a heat engine. In the gas flow direction, there is a first connection to an upstream pipe carrying gases from the engine. There is also a first exhaust tube and a second exhaust tube, these two tubes being parallel and being connected to the first connection. There is a second connection to a downstream gas discharge pipe, connected to the parallel exhaust tubes. The component is characterized in that, firstly the first tube has a depolluting component, and the second tube has a silencer. The second connection is a three-way valve.

Abstract: An exhaust manifold including a manifold body made of a first material and at least one heat shield insert provided inside the manifold body and made of a second material. The first material is a low cost material and the second material is a higher grade, temperature-resistant material. The manifold body includes a plurality of runners, collector and an outlet. The shield insert is preferably provided in the collector region adjacent to the outlet. The heat shield insert may have a curved sheet configuration or a tubular configuration depending on applications. The heat shield properly insulates the manifold body from the exhaust gas to protect the manifold body. The exhaust manifold, which is made from a combination of different materials, provides a more cost-effective solution in high temperature applications.

Abstract: A mixing and/or evaporating device (12) for an exhaust system (5) of a combustion engine (1), in particular of a motor vehicle, includes a support body (19), which encloses a flat cross section through which a flow can flow running transversely to the axial direction (20) of the device (12) in the circumferential direction (32). The support body (19) comprises two long side walls (21, 22) located opposite each other and two short side walls (23, 24) located opposite each other, wherein the short side walls (23, 24) each connect the two long side walls (21, 22) with each other. At least on one long side wall (21, 22) at least on one axial end (26, 27), a plurality of guide blades (25) is arranged. The guide blades (25) stand away in a direction of the other long side wall (21, 22) and are angled relative to the axial direction (20).

Abstract: A flow diffuser for vehicles of the type having an engine and an exhaust pipe generally includes a body including a plurality of inner diffusion ports extending through the body, wherein the body may be attached to an exhaust pipe at or near the exit plane of the exhaust pipe, wherein the body is sized to have a cross-sectional area that is smaller than the cross-sectional area of the exit plane of the exhaust pipe to create a plurality of outer diffusion ports around at least a portion of the outer perimeter of the body when coupled to the exhaust pipe, and one or more extension flaps extending from at least a portion of the outer perimeter of the body.

Abstract: An exhaust mixer (16) is provided for use in an engine exhaust system (10) downstream from an additive injector (14). The mixer (16) includes eight vanes (20), with four of the vanes (20A) extending from a first side (22) of the mixer (16) and arranged in an equally spaced circumferential array around a central axis (24), and the other four of the vanes (20B) extending from an opposite side (26) of the mixer (16) and arranged opposite from the other four vanes (20A) in an equally spaced circumferential array.

Abstract: A device for recovering heat from a hot gas stream comprises a gas diverter valve and a gas/liquid heat exchanger. The diverter valve comprises a valve body; a valve element movable between a bypass position and a heat exchange position; and a gas inlet and a gas outlet formed in the valve body. The heat exchanger comprises a heat exchanger core comprised of a stack of core plates arranged parallel to the exhaust gas flow path, and the heat exchanger is located outside the exhaust gas flow path and may be spaced therefrom so as to avoid unwanted heat transfer with the valve in bypass mode. The heat exchanger may include a bottom-most gas flow path adjacent to the bottom plate, and may include a mounting plate which is mechanically secured to the valve body, with a thermally insulating gasket provided between the mounting plate and the valve body.

Abstract: An exhaust gas purification device is capable of diffusing and introducing a reducing agent into a NOx catalyst arranged in a downstream side exhaust gas passage. A housing of the device includes a main body in which an upstream side exhaust gas passage and the downstream side exhaust gas passage are housed, and a cap attached to a first surface of the main body provided with an outlet side opening of the upstream side exhaust gas passage and an inlet side opening of the downstream side exhaust gas passage. At least one of the first surface of the main body and a second surface in the cap which faces the first surface includes a guide portion, for guiding an exhaust gas flow, and a reducing agent diffusion portion, for facilitating mixing of the reducing agent with the exhaust gas.

Abstract: A static mixing element, in particular for arrangement in an exhaust system of an internal combustion engine, has a grid-like component having a flow therethrough. The grid-like component is formed in one piece from an elongated metal strip. In the production of the static mixing element, the metal strip is bent to form the grid-like component.

Abstract: An exhaust mixer (16) is provided for use in an engine exhaust system (10) downstream from an additive injector (14). The mixer (16) includes eight vanes (20), with four of the vanes (20A) extending from a first side (22) of the mixer (16) and arranged in an equally spaced circumferential array around a central axis (24), and the other four of the vanes (20B) extending from an opposite side (26) of the mixer (16) and arranged opposite from the other four vanes (20A) in an equally spaced circumferential array. The vanes (20) include embossed ribs (60) and mount flanges (64).

Abstract: The present invention relates to an exhaust gas collector for an exhaust system of an internal combustion engine, in particular in a motor vehicle, having two internal shell bodies which each connect a plurality of inlet openings in a communicating fashion to an outlet opening, having an external shell body which encloses a receptacle space in which the two internal shell bodies are at least partially arranged. In order to improve the response behavior of a turbocharger, which can be connected to the exhaust gas collector, a dividing wall is proposed which divides the receptacle space into two partial spaces, one of the two internal shell bodies being at least partially arranged in each of the partial spaces.

Abstract: The invention provides an exhaust gas purification apparatus for an internal combustion engine which evenly diffuses a reducing agent over an entirety of the exhaust gas which flows into an NOx catalyst disposed on the downstream side of thereof. The exhaust gas purification apparatus includes an NOx catalyst disposed in an exhaust gas passage of an internal combustion engine, and a reducing agent injecting unit for injecting the reducing agent into the exhaust gas passage which is on an upstream side of the NOx catalyst. A narrowed portion, in which a cross-sectional area of a flow passage is smaller than a cross-sectional area of the exhaust gas passage and of the NOx catalyst, is provided on a downstream side of an injecting position by the reducing agent injecting unit and the upstream side of the NOx catalyst, and a reducing agent diffusing device is provided on the narrowed portion.

Abstract: A exhaust component assembly includes an exhaust component and a divider plate. The exhaust component includes an inner wall defining a gas passageway. The divider plate is inserted in the gas passageway and secured to the exhaust component by mechanical locking means, generally in an interference-fit relationship.

Abstract: A dual exhaust system includes a first exhaust component defining a first exhaust path and a second exhaust component defining a second exhaust path that is different from the first exhaust path. A first valve is associated with the first exhaust path and a second valve is associated with the second exhaust path. The first valve and second valve operate independently of each other to vary exhaust flow and provide sufficient noise control for varying applications.

Abstract: A system is disclosed including a primary engine that provides vehicle propulsion and a secondary engine that drives a generator to provide auxiliary power. The system further includes a first exhaust gas passageway from the primary engine and a second exhaust gas passageway from the secondary engine. The system further includes an emission treatment device including an exhaust inlet to treat exhaust from the primary and secondary engines. The system further includes an exhaust routing device that selectively routes exhaust from the first passageway or the second passageway to the exhaust inlet. The exhaust routing device at least partially blocks the first passageway or the second passageway from fluid communication with the exhaust inlet.

Abstract: A flow diffuser for vehicles of the type having an engine and an exhaust pipe generally includes a body having a first end configured for attachment to an exhaust pipe, and a diffusion portion including first and second diffusion sections, and a plurality of diversion wings disposed within the body.

Abstract: An engine exhaust aftertreatment system including a mixer disposed in the exhaust stream. The mixer includes a mesh section having a mesh of wires and may include a baffle section having a deflector that redirects a direction of flow of the exhaust stream. The mesh section may not extend across an entire width of an exhaust conduit containing the exhaust stream. The mesh section may also be sized and located to intersect the reductant introduced by the injector.

Abstract: An end cap for an exhaust treatment device is disclosed. The end cap has a cylindrical housing with an axial direction, a radial direction substantially orthogonal to the axial direction, a first open end, and a second closed end opposing the first open end in the axial direction. The end cap also has an integral port member extending from an annular surface of the cylindrical housing. The integral port member has a central axis aligned in the radial direction, and an exterior surface of the integral port member tangentially connects to an exterior surface of the cylindrical housing.

Abstract: An exhaust purification apparatus for an engine has a first casing (17) that is interposed in an exhaust path (13); a second casing (23) that is set downstream of the first casing (17) and contains an exhaust purification device (24); a connecting pipe (22, 41, 51) that connects the first casing and the second casing (23) to each other and includes an insertion portion that is inserted in the first casing (17); and an injection nozzle (27, 52) that has a tip end inserted in the connecting pipe (22, 41, 51) and injects an auxiliary agent from the tip end. The insertion portion of the connecting pipe (22, 41, 51) is provided with a plurality of through-holes (22a, 41a, 41b, 51a) connecting the inside and the outside of the connecting pipe (22, 41, 51), so that the exhaust gas contained in the first casing (17) is introduced into the connecting pipe (22, 41, 51) through the through-holes and guided towards the second casing (23).

Abstract: Disclosed is an exhaust extension apparatus and method for converting a motorcycle exhaust system into a dual or quadruple exhaust system. The device is suited for motorcycles, off-road vehicles, or a vehicle with a reciprocating engine with multiple cylinders. Each exhaust extension unit comprises two metallic pipes shaped and welded together to form an exhaust extension unit having one exhaust intake and two equal-flow exhaust exits. Two exhaust extension units may be paired and connected to the exhaust pipes on each side of a motorcycle rider's seat, thereby providing a quadruple set of exhaust pipes and further, an increase in the performance of the engine.

Abstract: A Tier 4 ready silencer that can accept both DOCs and DPFs to meet Tier 3 and can interface with an SCR system to meet Tier 4. The invention includes a silencer compartment with empty filter/catalyst banks in the shape of a V. DOCs and DPFs can be added and arranged in the V-shaped banks as needed. Various exhaust fins direct exhaust flow through the filters/catalysts. Multiple exhaust inlets to the device provide the most direct route possible from the engine outlets. A mixing tube and an SCR system can be added to the output port to comply with Tier 4.

Abstract: A system for controlling the temperature of an exhaust stream includes a main exhaust passageway adapted to receive the exhaust stream from an engine. A bypass passage includes an inlet and an outlet in communication with the main exhaust passageway. The outlet is located downstream from the inlet. A burner is positioned within the bypass passage for treating the exhaust passing through the bypass passage. A valve is positioned within the main exhaust passageway downstream from the inlet and upstream from the outlet. The valve is operable to vary the exhaust flow through the burner. A controller selectively operates the burner to maintain a desired exhaust temperature downstream of the outlet.

Abstract: An exhaust gas recirculation system having at least one cooler with a housing and at least one valve with a pivotably actuated valve member on an inlet side is characterized in that an actuator for the valve is mounted to the housing of the cooler, which is connected to the valve via at least one lever and at least one connection member such as a coupling rod, a ball-and-socket joint being provided between at least one lever and at least one connection member such as a coupling rod.

Abstract: A system for controlling performance of an internal combustion engine. The system may include an internal combustion engine having an exhaust system for processing gases exhausted from the internal combustion engine. The exhaust system may be comprised of at least one mixing device, at least one emission control device, and a delivery apparatus for delivering an agent affecting operation of the emission control device into the exhaust system. The at least one mixing device may be located downstream of the internal combustion engine and upstream of the at least one emission control device, and the delivery apparatus may be located upstream of the emission control device. The system may include a controller to adjust at least one engine parameter in relation to an operating condition of the mixing device.

Abstract: In a method for operating an actuator for a wastegate actuating device of an exhaust gas turbocharger, a wastegate situated in an exhaust branch of an internal combustion engine is electrically adjustable with the aid of the actuator, and an exhaust gas quantity flowing through the exhaust gas turbocharger is adjustable as a function of an opening position of the wastegate. The actuator is controlled using an applied electrical power in a closed position of the wastegate to provide a varying closing pressure of the wastegate as a function of a characteristic curve of an exhaust gas counterpressure applied via the wastegate.

Abstract: An apparatus for an exhaust gas system includes a main exhaust passage, a main catalytic converter disposed in the main exhaust passage, a bypass exhaust passage, a bypass catalytic converter disposed in the bypass exhaust passage, and a valve configured to open or close a section of the main exhaust passage. The bypass exhaust passage bypasses the main exhaust passage between a branch point of the bypass exhaust passage out of the main exhaust passage and a junction with the main exhaust passage at a upstream side of the main catalytic converter. A first sensor indicates a first air-fuel ratio of exhaust gas in the bypass exhaust passage. A second sensor indicates a second air-fuel ratio of exhaust gas flowing into the main catalytic converter. A controller determines whether the valve in the closed configuration leaks exhaust gas based on the first and second air-fuel ratios of exhaust gas.

Abstract: In an addition-amount controller for an exhaust gas purifying agent to be used for an exhaust emission control system, a catalyst has properties of storing NH3 and further decreasing the critical reaction temperature as an amount of NH3 storage at the catalyst is increased. In the addition-amount controller, a present NH3 storage amount that is a storage amount of NH3 of the catalyst is detected at a detection time, the NH3 storage amount of the catalyst is changed by controlling an addition amount by an addition valve, and the NH3 storage amount of the catalyst is controlled to a target NH3 storage amount based on the detected present NH3 storage amount.

Abstract: An exhaust-gas aftertreatment system for exhaust gases of an internal combustion engine. In one example, a portion of the engine exhaust gases goes to the particulate filter and the other portion of engine exhaust gases goes to the catalyst element. The outlet of the filter element is directed to the inlet of the catalyst element and the outlet of the catalyst element is directed to the inlet of the filter element. Thus, the engine exhaust gases are filtered and processed by a catalyst.

Abstract: A purification system for variable post injection in LP EGR, the system includes a turbo charger disposed downstream of a diesel engine, a DPF (catalyzed particulate filter) disposed downstream of the turbo charger, a NOx reduction apparatus disposed upstream or downstream of the DPF, a bypass line diverged from the DPF for mixing exhaust gas and air inflowing the turbo charger, a exhaust gas control portion disposed downstream of the DPF for controlling flowing of the exhaust gas and a lean/rich controlling portion for controlling lean/rich of the exhaust gas.

Abstract: An apparatus is provided for a vehicle with an engine that includes an exhaust system through which exhaust gas is discharged from the engine. A heat exchanger is positioned at least partially within the exhaust system. Coolant flow passages are provided in thermal communication with the engine and with the heat exchanger. A bypass valve is operable in a first mode to direct the exhaust gas across the heat exchanger along a first flow path to transfer exhaust heat to the coolant flow passages, and is further operable in a second mode to direct at least a portion of the exhaust gas across the heat exchanger along a second flow path to transfer exhaust heat to the coolant flow passages in a second coolant heating mode. The second flow path is restricted relative to the first flow path. A method of managing exhaust heat recovery is also provided.

Abstract: An exhaust gas system includes an exhaust manifold, in particular a single-wall exhaust manifold, which includes a plurality of inlet pipes for connection to exhaust gas outlets of an internal combustion engine and a collector device for the combining of the inlet pipes. The collector device has an outlet opening which is connected to downstream elements of the exhaust gas system, wherein the collector device is resistant to bending and the inlet pipes are comparatively flexible with respect to the collector device. The collector device includes an inlet pipe stub which is likewise resistant to bending and which is made for the direct connection to an exhaust gas outlet of an internal combustion engine.

Abstract: When switching an exhaust throttle valve from full opening to a closed position to warm up an engine, an intake throttle valve is fixed to full opening, an EGR valve is fixed to full closing, and a variable turbo-vane is fixed to a predetermined opening degree to accelerate a gas flow rate from an intake passage to an exhaust passage, a fully opened flow rate is detected and stored by gas flow rate detector, with the exhaust throttle valve being full opening. Then, an instruction is issued to the exhaust throttle valve to switch from the full opening to a closed position, after which a rotation number of the engine is detected, a threshold value is determined based thereon, a closed position flow rate is detected, a flow rate difference relative to the stored fully opened flow rate is determined, and failure of the exhaust throttle valve is judged based on whether the flow rate difference is less than the determined threshold value.