EP3642462B1 - Tuyau d'échappement, moteur à combustion interne et véhicule automobile - Google Patents

Tuyau d'échappement, moteur à combustion interne et véhicule automobile Download PDF

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Publication number
EP3642462B1
EP3642462B1 EP18729935.9A EP18729935A EP3642462B1 EP 3642462 B1 EP3642462 B1 EP 3642462B1 EP 18729935 A EP18729935 A EP 18729935A EP 3642462 B1 EP3642462 B1 EP 3642462B1
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EP
European Patent Office
Prior art keywords
pipe
exhaust gas
combustion engine
exhaust
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18729935.9A
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German (de)
English (en)
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EP3642462A1 (fr
Inventor
Vitali Schleiermacher
Ronny Krzok
Uwe Schrottke
Dirk Thuermann
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Volkswagen AG
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Volkswagen AG
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Publication date
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Publication of EP3642462A1 publication Critical patent/EP3642462A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • F01N13/141—Double-walled exhaust pipes or housings
    • F01N13/143—Double-walled exhaust pipes or housings with air filling the space between both walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/05—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of air, e.g. by mixing exhaust with air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2270/00—Mixing air with exhaust gases
    • F01N2270/04—Mixing air with exhaust gases for afterburning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/08—Gas passages being formed between the walls of an outer shell and an inner chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/08—Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • F01N3/34—Arrangements for supply of additional air using air conduits or jet air pumps, e.g. near the engine exhaust port

Definitions

  • the invention relates to an exhaust pipe for the exhaust line of an internal combustion engine, the exhaust pipe having an inlet opening for an air connection.
  • the invention further relates to an internal combustion engine with such an exhaust pipe and a motor vehicle with such an internal combustion engine.
  • the exhaust gases from internal combustion engines that are used to drive motor vehicles are subject to extensive post-treatment in order to reduce pollutant emissions to a minimum.
  • a large number of different exhaust gas aftertreatment devices are used in order to be able to reduce the various pollutants in the exhaust gas as effectively as possible.
  • particle filters through which particles contained in the exhaust gas, in particular soot particles, can be filtered out, is widespread in the aftertreatment of exhaust gases generated by diesel engines.
  • Such particle filters must be regenerated continuously or discontinuously in order to prevent the embedded particles from increasing the exhaust gas back pressure caused by the particle filter in an impermissible manner. This is done by post-combustion or post-oxidation of the soot particles, which requires a correspondingly high (ignition) temperature.
  • the exhaust gas usually does not have a correspondingly high temperature, at least when an internal combustion engine is operated at relatively low speeds and relatively low loads, as is the case in particular in city traffic. In this case, the temperature of the exhaust gas must be increased accordingly, for which various measures are known.
  • the temperature required for the oxidation of the soot particles can be lowered to such an extent that it can also be achieved when an internal combustion engine is operated at relatively low speeds and loads.
  • This arrangement can mean that the exhaust gas arriving at the particle filter is no longer hot enough for regeneration of the particle filter, despite a relatively high temperature that it has when leaving the internal combustion engine due to internal engine measures. In this case, it can make sense to increase the temperature of the exhaust gas again by post-oxidation of unburned hydrocarbons contained in the exhaust gas in the particle filter, which also has a catalytic effect in this regard.
  • air or the oxygen contained in the air must be supplied to the exhaust gas, for which purpose an air connection can be integrated in an exhaust pipe of the exhaust system upstream of the particle filter.
  • the U.S. 4,339,918 discloses an exhaust gas routing device intended to be connected to the end of an exhaust line of an internal combustion engine of a motor vehicle.
  • the device includes a guide tube that widens in a first section, based on the intended flow direction for the exhaust gas.
  • the pipe tapers again before it widens again in a third (end) section.
  • a plurality of star-shaped and spirally extending vanes are arranged in the first and second sections of the tube.
  • the exhaust gas is to be discharged in an improved manner from the combustion chambers of the internal combustion engine to which the exhaust line is connected, which in turn is intended to have a positive effect on the operating behavior of the internal combustion engine.
  • the device has a further tube which surrounds the third section of the guide tube on the outside, this tube delimiting an annular gap open at both ends with the outside of the guide tube. While the motor vehicle is in motion, the headwind flowing through this annular gap is intended to cause an additional suction effect on the exhaust gas exiting the guide tube.
  • the EP 2 711 516 A2 discloses a catalytic converter system for a marine engine with a catalytic converter material accommodated within an inner pipe section, an annular channel being formed between the inner pipe section and an outer pipe section, into which a coolant, in particular water, can be introduced via an inlet opening. This flows out via a ring-shaped guide element, which forms a plurality of openings, at an open end of the ring channel and mixes there with the exhaust gas that has been post-treated by means of the catalyst material.
  • the U.S. 2016/084138 A1 describes a tailpipe for the exhaust system of a motor vehicle, which is double-walled, with ambient air entering the inlet side of the tailpipe via inlet openings in an annular channel formed between the two walls and exiting again at the end.
  • This ambient air is intended to keep the temperature of the outer wall low and thereby protect a decoration, for example a paint finish, on this outer wall from thermal overload.
  • the DE 10 2010 044 102 A1 discloses an exhaust line for an internal combustion engine with a catalytic converter and a particle filter downstream of this catalytic converter, an inlet opening for introducing secondary air being provided upstream of the particle filter and preferably downstream of the catalytic converter.
  • WO 96/23133 A1 describes a method and a device used for the aftertreatment of exhaust gas from small, rich-fueled internal combustion engines, such as those used in lawnmowers or small generators, and in which exhaust gas aftertreatment by means of catalytic converters, as they are known from the field of automotive engineering, to would be costly.
  • a muffler is designed as an oxidation device, in which unburned hydrocarbons are intended to oxidize with ambient air that is supplied separately. This secondary air is introduced into the exhaust line via an inlet opening and an annular duct formed between an inner pipe section and an outer pipe section.
  • the EP 0 640 752 A1 describes a muffler-integrated catalytic converter for a motorcycle, in which secondary air to be converted in the catalytic converter is drawn in at the downstream end of the catalytic converter and guided via an annular duct to an annular outlet opening located upstream of the catalytic converter.
  • the U.S. 2007/0119433 A1 discloses an exhaust gas aftertreatment device with an integrated venturi tube, through which ambient air can be mixed with an exhaust gas flow.
  • the U.S. 3,947,544 describes a section of an exhaust system of an internal combustion engine in the form of a double-walled tube that forms an annular gap, wherein ambient air can be introduced into the inner volume of the inner tube in which exhaust gas is routed via the annular gap and a valve device.
  • the invention was based on the object of specifying an exhaust pipe for the exhaust line of an internal combustion engine, which has an air connection which serves to mix air into the exhaust gas flowing in the exhaust pipe, with the exhaust pipe being able to provide as much good mixing should be achieved.
  • An exhaust pipe for the exhaust system of an internal combustion engine which has an inlet opening for an air connection, comprises an inner pipe section which is surrounded by an outer pipe section in order to form an annular channel which is closed at one (longitudinally axial) end and at the other (longitudinally axial) end to the
  • the inner volume of the exhaust pipe is designed to be open, with the inlet opening for the air connection being integrated into the outer pipe section.
  • At least one flow guide element for generating a swirl flow of the exhaust gas is arranged within the inner pipe section.
  • the exhaust gas can be mixed with the introduced air be positively influenced.
  • a negative pressure can be generated within the ring channel, as a result of which the introduction of air via the air connection can be supported.
  • Such an exhaust gas pipe according to the invention can advantageously be produced according to the invention in that the flow guide element is designed in the form of a (plastically and thus permanently) deformed pipe wall section.
  • the good mixing of the air with the exhaust gas that can be achieved by the design of an exhaust pipe according to the invention can be of particular importance if the exhaust line branches into at least and in particular exactly two lines at a relatively short distance behind the exhaust pipe, with (each) a particle filter in one or more or all of the strands is integrated. As a result, the formation of unequal mixtures of exhaust gas and air in the strands and thus in the particle filter(s) integrated therein can be avoided as far as possible.
  • the open end of the ring channel is arranged downstream in comparison to the closed end with respect to a flow direction of the exhaust gas provided for the use of the exhaust pipe. It can thereby be achieved that the air flowing in the annular duct in the direction of the open end basically has the same direction of flow as the exhaust gas flowing through the exhaust gas pipe, as a result of which the turbulence increasing the exhaust gas pressure when the air flow is introduced into the exhaust gas flow can be kept low.
  • the open end of the annular duct is arranged upstream in relation to the intended through-flow direction in comparison to the closed end, as a result of which further improved mixing can be achieved directly in the area where the air flow is introduced into the exhaust gas flow.
  • An exhaust pipe according to the invention which is characterized by a structurally particularly simple design, can comprise a first pipe section and a second pipe section, with an end section of the first pipe section being inserted in the longitudinal axial direction, preferably with parallel or coaxial alignment of their longitudinal axes, into an end section of the second pipe section is, so that the both end portions of the pipe pieces form the inner pipe portion and the outer pipe portion of the exhaust pipe.
  • an exhaust gas pipe according to the invention can essentially be formed from two simple pipe sections.
  • At least one or both of the pipe pieces, which preferably have a circular cross-section, can have a constant inner and/or outer diameter, in particular also over the longitudinal extent.
  • the closed end of the ring channel is formed by means of an end edge of the second pipe section running radially inwards.
  • this end edge of the second pipe section which extends radially inwards, can contact the outside of the first pipe section directly or with the interposition of an additional element, for example a sealing element.
  • an exhaust gas pipe according to the invention can be produced particularly easily and thus inexpensively if the end edge running radially inwards is designed as a (plastically and thus permanently) deformed end piece of the second pipe piece.
  • the end edge of the second pipe section running radially inwards can therefore be produced in a simple manner by bending an end section of the second pipe section radially inwards, which can be done before or after the two pipe sections have been plugged into one another.
  • the invention also relates to a method for producing a corresponding exhaust pipe according to the invention, in which the pipe sections are inserted into one another in such a way that the end sections, which are then preferably aligned coaxially with one another, form the inner pipe section and the outer pipe section.
  • the ring channel located between the inner pipe section and the outer pipe section is closed at the outer end of the second pipe section, which can preferably be achieved by a previous or subsequent bending of a corresponding end section of the second pipe section.
  • the inlet opening for the air connection can also be made in the area of the end section of the second pipe section delimiting the ring channel, which can also be done before or after plugging the first pipe section together.
  • a connection piece for the air connection can be connected to the second tube piece, which can be done in particular in a form-fitting or material-fitting manner, for example by welding or soldering.
  • the pipe wall section can have a triangular shape, with a deformed edge of the flow guide element extending from a longitudinal opening made in the pipe wall, which Longitudinally (in particular parallel to the longitudinal axis) of the inner pipe section is aligned, runs spirally with respect to the longitudinal axis of the inner pipe section. Provision can furthermore preferably be made for the longitudinal opening to end at an end edge of the inner pipe section, so that the deformed edge also extends to this end edge. In this way, the introduction of a second longitudinal opening running in the circumferential direction and merging into the first longitudinal opening, which is also possible in principle, can be dispensed with.
  • the longitudinal opening(s) can/can preferably be subsequently made in the pipe wall in the form of separating cuts.
  • the production of such a flow guide element is therefore relatively simple. For this purpose, only the longitudinal opening(s) has/have to be made in the inner pipe section and then the flow guide element is formed by bending a corresponding triangular pipe wall section along the forming edge.
  • the invention also relates to a corresponding method for producing such an exhaust pipe according to the invention.
  • the inner pipe section forms a passage or pipe wall opening adjacent to a side of the flow guide element that is preferably located downstream (with respect to the intended flow direction of the exhaust gas).
  • a portion of the air supplied to the annular duct via the inlet opening for the air connection can advantageously enter the exhaust gas flow through this through-opening in an orientation at an angle with respect to the section of the longitudinal axis of the exhaust pipe located there, with this air flow also being a swirl flow due to the adjacent arrangement of the flow guide element can train.
  • An internal combustion engine comprises at least one internal combustion engine and an exhaust system for discharging exhaust gas from the internal combustion engine, with an air connection for introducing air into the exhaust system also being integrated into the exhaust system.
  • the exhaust line also includes at least one exhaust pipe according to the invention.
  • a motor vehicle according to the invention comprises at least one internal combustion engine according to the invention.
  • the motor vehicle can in particular be a wheel-based motor vehicle, preferably a car or truck.
  • the internal combustion engine Internal combustion engine can be provided in particular for (direct or indirect) provision of the drive power for the motor vehicle.
  • the exhaust pipe of an internal combustion engine is used to admix air as required to the exhaust gas routed through the exhaust line or through the exhaust pipe, this air preferably being used to regenerate a particle filter integrated in the exhaust line downstream of the air connection.
  • a regeneration of the particle filter using the air mixed with the exhaust gas can be necessary or useful in particular because an exhaust gas catalytic converter, in particular a 3-way catalytic converter, is integrated in the exhaust line upstream of the air connection, so that the particle filter can be removed relatively far results from the internal combustion engine, which in turn means that the exhaust gas already has a relatively low temperature when it reaches the particle filter, in particular also because of the previous flow through the exhaust gas catalytic converter.
  • Such an arrangement of such exhaust gas aftertreatment devices can be useful in particular in a spark-ignited internal combustion engine, in particular in an internal combustion engine operated according to the Otto principle (Otto engine).
  • the particle filter is arranged below an underbody of the motor vehicle.
  • the “underbody” is understood to be the underside of the body of a motor vehicle, which extends from the rear end of an engine compartment accommodating the internal combustion engine in the direction of the rear of the motor vehicle.
  • the air intended for admixture into the exhaust gas can be taken in particular from a fresh gas line of the internal combustion engine, for which purpose a connecting line is provided between the fresh gas line and the air connection for the exhaust gas pipe.
  • the connecting line can branch off from the fresh-gas line in particular downstream of an air filter in order to supply filtered air to the exhaust line and possibly also to a conveying device that is preferably integrated into the connecting line and is provided for conveying air from the fresh-gas line to the air connection of the exhaust pipe.
  • the 1 shows a motor vehicle according to the invention with an internal combustion engine 10 according to the invention.
  • the internal combustion engine 10 can according to the 2 an internal combustion engine 12, in particular an Otto engine, which forms a plurality of cylinders 14.
  • the fresh gas is supplied to the internal combustion engine 12 via a fresh gas line and is sucked in from the environment via an intake port 16, cleaned in an air filter 18 and then fed into a compressor 20, which is part of an exhaust gas turbocharger.
  • the fresh gas is compressed by the compressor 20, then cooled in an intercooler 22 and, optionally controlled by a throttle valve 24, fed to the combustion chambers.
  • the compressor 20 is driven by means of a turbine 26, which is integrated into an exhaust system of the internal combustion engine and is also part of the exhaust gas turbocharger.
  • Exhaust gas which is produced during the combustion of the fuel-fresh gas mixture in the combustion chambers of the internal combustion engine 10, is discharged from the internal combustion engine 12 via the exhaust system and first flows through an exhaust gas catalytic converter 28 in the form of a 3-way catalytic converter, then through the turbine 26, then an exhaust pipe 30 according to the invention and then a particle filter 32 before the exhaust gas is discharged into the environment after flowing through a silencer (not shown).
  • the flow through the turbine 26 leads in a known manner to a rotating drive of a turbine wheel, which in turn is non-rotatably connected via a shaft 34 to a compressor wheel of the compressor 20 .
  • the rotating drive of the turbine wheel is thus transferred to the compressor wheel.
  • the turbine 26 can be bypassed in a known manner by means of a so-called waste gate 36 .
  • a turbine with variable turbine geometry can also be used.
  • the particle filter 32 is used to filter out particles and in particular soot particles from the exhaust gas. This can lead to the particle filter 32 becoming clogged during operation, which makes it necessary to regenerate the particle filter 32 in order to prevent the exhaust gas back pressure caused by the particle filter 32 from becoming unacceptably high.
  • internal engine measures are implemented during operation of the internal combustion engine 12 in order on the one hand to set relatively high exhaust gas temperatures and on the other hand to increase the proportion of unburned hydrocarbons within the exhaust gas.
  • the oxygen provided for this purpose is supplied to the exhaust gas as a component of air via an air connection 42 which is integrated into an exhaust pipe 30 according to the invention.
  • the air is guided via a connecting line 38 which exits from the fresh gas line downstream of the air filter 18 and opens out via the air connection 42 into an inlet opening 40 of the exhaust gas pipe 30 .
  • the conveying of this air is supported or effected by means of a conveying device 44 .
  • the exhaust pipe 30 represents a section of the exhaust line arranged at a relatively short distance upstream of the particle filter 32 .
  • This exhaust pipe 30 can be in the 3 have shown constructive configuration.
  • This exhaust pipe 30 according to 3 comprises a first piece of pipe 46, which has constant inner and outer diameters over the longitudinal extension, and a second pipe section 48, which also has constant inner and outer diameters over the longitudinal extension.
  • the two pipe sections 46, 48 are designed to run in a curved manner.
  • An end section 52 of the first pipe section 46 is inserted in a direction along its longitudinal axis 50 and in a coaxial arrangement into an end section 54 of the second pipe section 48 .
  • This end section 52 of the first pipe section 46 represents an inner pipe section 56 and the end section 54 of the second pipe section 48 represents an outer pipe section 58 of the exhaust pipe 30.
  • An annular channel 60 is formed between the two end sections 52, 54 or pipe sections 56, 58, since the inner diameter of the second Pipe section 48 is greater than the outer diameter of the first pipe section 46 to a defined extent.
  • This ring channel 60 is formed at the upstream end with respect to the (flow) direction provided for the flow of the exhaust gas 62 and is therefore closed to the environment.
  • a bent end piece 64 of the second pipe section 48 forms a radially inwardly extending end edge 66 which contacts the outside of the first pipe section 46 on the inside and is sealingly connected to it, for example soldered, welded or glued.
  • the annular duct 60 is open, whereby air 68, which is supplied to the exhaust pipe 30 via the air connection 42 connected to the inlet opening 40, is initially completely inside the annular duct 60 and can flow from there with a flow direction that basically corresponds to the direction of flow of the exhaust gas 62 into the section of the second pipe section 48 located downstream of the annular duct 60, where the air 68 combines with the exhaust gas 62 flowing from the first pipe section 46 into the second Pipe section 48 has flowed over, mix and can be fed to the particle filter 32 as an exhaust gas/air mixture 70 .
  • the inner pipe section 56 forms a plurality of flow guide elements 72 in the form of guide plates aligned obliquely with respect to the longitudinal axis 50 of the exhaust pipe 30 at the end located downstream with respect to the flow direction of the exhaust gas 62.
  • These flow guide elements 74 cause a twist of these through or exhaust gas flow flowing around, whereby the mixing with the edge-supplied air 68 is improved.
  • the flow guide elements 72 are arranged in an identical alignment and distributed over the circumference of the inner tube section 56 with a uniform pitch. These were produced in that longitudinal openings 74 running longitudinally and axially with a defined length in the form of separating cuts were made in the tube wall formed by the end section 52 of the first tube piece 46 with a uniform pitch. Then, in each case, a triangular section of this tube wall was bent inwards along a deformed edge 76 running obliquely or spirally about the longitudinal axis 50, with this deformed edge 76 starting from the closed end of the associated longitudinal opening 74 to that end of the inner tube section 56 or the end section 52 of the first piece of pipe 46, where the longitudinal opening 74 ends.
  • passage openings 78 located in their slipstream (with respect to the flow of the exhaust gas 62) are simultaneously formed in the pipe wall of the inner pipe section 56.
  • the air supplied to the exhaust pipe 30 can flow into the flow of the exhaust gas 62, in part also in directions running obliquely with respect to the section of the longitudinal axis 50 there and with a twist caused by the flow guide elements 72, which also has a positive effect on the mixing of the air 68 with the exhaust gas 62 affects.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas After Treatment (AREA)

Claims (12)

  1. Tuyau d'échappement (30) pour la ligne d'échappement d'un moteur à combustion interne (10), le tuyau d'échappement (30) comportant un orifice d'entrée (40) pour un raccordement d'air (42) et une partie de tuyau intérieure (56), qui est entourée d'une partie de tuyau extérieure (58) pour former un conduit circulaire (60), qui est réalisé fermé à une extrémité et ouvert sur le volume intérieur du tuyau d'échappement (30) à l'autre extrémité, l'orifice d'entrée (40) pour le raccordement d'air (42) étant intégré dans la partie de tuyau extérieure (58), caractérisé en ce qu'au moins un élément de guidage d'écoulement (72) destiné à générer un écoulement tourbillonnaire du gaz d'échappement est disposé dans la partie de tuyau intérieure (56), l'élément de guidage d'écoulement (72) étant réalisé sous la forme d'une partie déformée d'une paroi de tuyau de la partie de tuyau intérieure (56).
  2. Tuyau d'échappement (30) selon la revendication 1, caractérisé par un premier tronçon de tuyau (46) et un second tronçon de tuyau (48), une partie d'extrémité (52) du premier tronçon de tuyau (46) étant enfoncée dans une partie d'extrémité (54) du second tronçon de tuyau (48), de telle sorte que les deux parties d'extrémité (52, 54) forment la partie de tuyau intérieure (56) et la partie de tuyau extérieure (58).
  3. Tuyau d'échappement (30) selon la revendication 2, caractérisé en ce que l'extrémité fermée du conduit circulaire (30) est réalisée au moyen d'un bord d'extrémité (66) s'étendant radialement vers l'intérieur du second tronçon de tuyau (48).
  4. Tuyau d'échappement (30) selon la revendication 3, caractérisé en ce que le bord d'extrémité (66) s'étendant radialement vers l'intérieur est réalisé sous la forme d'un bout (64) déformé du second tronçon de tuyau (48).
  5. Tuyau d'échappement (30) selon l'une quelconque des revendications précédentes, caractérisé en ce que la partie de paroi de tuyau présente une forme triangulaire, un bord de déformation (76) de l'élément de guidage d'écoulement (72) s'étendant depuis une ouverture longitudinale (74) ménagée dans la paroi de tuyau, qui s'étend dans le sens de la longueur de la partie de tuyau intérieure (56), en forme de spirale par rapport à l'axe longitudinal (50) de la partie de tuyau intérieure (56).
  6. Tuyau d'échappement (30) selon l'une quelconque des revendications précédentes, caractérisé en ce que la partie de tuyau intérieure (56) forme, de manière adjacente à un côté de l'élément de guidage d'écoulement (72), un orifice de passage (78).
  7. Moteur à combustion interne (10) doté d'un moteur à combustion (12) et d'une ligne d'échappement pour évacuer des gaz d'échappement du moteur à combustion (12), un raccordement d'air (42) pour amener de l'air dans la ligne d'échappement étant intégré dans la ligne d'échappement, caractérisé en ce que la ligne d'échappement comprend un tuyau d'échappement (30) selon l'une quelconque des revendications précédentes.
  8. Moteur à combustion interne (10) selon la revendication 7, caractérisé en ce qu'un filtre à particules (32) est intégré dans la ligne d'échappement en aval du raccordement d'air.
  9. Moteur à combustion interne (10) selon la revendication 7 ou 8, caractérisé en ce qu'un pot catalytique (28) est intégré dans la ligne d'échappement en amont du raccordement d'air (42).
  10. Moteur à combustion interne (10) selon l'une quelconque des revendications 7 à 9, caractérisé en ce que le moteur à combustion (12) est réalisé à allumage externe.
  11. Véhicule automobile comprenant un moteur à combustion interne (10) selon l'une quelconque des revendications 7 à 10.
  12. Véhicule automobile selon la revendication 11 doté d'un moteur à combustion interne (10) selon la revendication 8 ou l'une des revendications dépendant de la revendication 8, caractérisé en ce que le filtre à particules (32) est disposé en dessous d'un dessous de caisse 80 du véhicule automobile.
EP18729935.9A 2017-06-19 2018-06-05 Tuyau d'échappement, moteur à combustion interne et véhicule automobile Active EP3642462B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017113357.7A DE102017113357A1 (de) 2017-06-19 2017-06-19 Abgasrohr, Brennkraftmaschine und Kraftfahrzeug
PCT/EP2018/064708 WO2018234027A1 (fr) 2017-06-19 2018-06-05 Tuyau d'échappement, moteur à combustion interne et véhicule automobile

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EP3642462B1 true EP3642462B1 (fr) 2022-08-10

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US (1) US11149605B2 (fr)
EP (1) EP3642462B1 (fr)
CN (1) CN110741143B (fr)
DE (1) DE102017113357A1 (fr)
WO (1) WO2018234027A1 (fr)

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CN110374721A (zh) * 2019-06-11 2019-10-25 南京理工大学 一种基于引射降温技术的柴油机排气红外抑制装置
DE102021106739A1 (de) 2021-03-18 2022-09-22 Volkswagen Aktiengesellschaft Vorrichtung und Verfahren zur Einleitung von Regenerationsluft in einen Abgasstrang
CN113623056B (zh) * 2021-09-15 2023-01-10 无锡威孚力达催化净化器有限责任公司 双旋流紧耦合混合器
IT202100029141A1 (it) * 2021-11-17 2023-05-17 Fpt Ind Spa Miscelatore per sistema di post-trattamento di gas di scarico veicolari e sistema di post-trattamento comprendente tale miscelatore

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CN110741143A (zh) 2020-01-31
WO2018234027A1 (fr) 2018-12-27
EP3642462A1 (fr) 2020-04-29
US11149605B2 (en) 2021-10-19
DE102017113357A1 (de) 2018-12-20
US20200173322A1 (en) 2020-06-04
CN110741143B (zh) 2022-07-15

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