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WO2022106098A1 - Dispositif pour l'ajout d'un agent de réduction liquide dans un tuyau de gaz d'échappement d'un moteur à combustion interne, agencement pour un système de post-traitement de gaz d'échappement - Google Patents

Dispositif pour l'ajout d'un agent de réduction liquide dans un tuyau de gaz d'échappement d'un moteur à combustion interne, agencement pour un système de post-traitement de gaz d'échappement Download PDF

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Publication number
WO2022106098A1
WO2022106098A1 PCT/EP2021/076079 EP2021076079W WO2022106098A1 WO 2022106098 A1 WO2022106098 A1 WO 2022106098A1 EP 2021076079 W EP2021076079 W EP 2021076079W WO 2022106098 A1 WO2022106098 A1 WO 2022106098A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
protective wall
exhaust gas
reducing agent
metering
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.)
Ceased
Application number
PCT/EP2021/076079
Other languages
German (de)
English (en)
Inventor
Thorsten Rankel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2022106098A1 publication Critical patent/WO2022106098A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F01N3/08—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
    • F01N3/18—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 methods of operation; Control
    • F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent
    • 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
    • F01N2240/16—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 an electric heater, i.e. a resistance heater
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
    • F01N2260/024—Exhaust treating devices having provisions not otherwise provided for for cooling the device using a liquid
    • 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
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • 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
    • F01N2610/11—Adding substances to exhaust gases the substance or part of the dosing system being cooled
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a device for admixing a liquid reducing agent into an exhaust pipe of an internal combustion engine, with a metering module having a controllable metering valve, the metering valve having a valve tip that can be assigned to the exhaust pipe and having a valve opening in which a reducing agent channel ends, the valve opening having in particular a displaceable valve element for releasing and closing the valve opening, the metering valve having a protective wall which is arranged coaxially with the valve tip and which can be inserted at least in certain areas into an opening in the exhaust gas pipe, and with a device assigned to the metering valve for influencing the temperature of the protective wall.
  • the invention also relates to an arrangement for an exhaust gas aftertreatment system, with an exhaust pipe that can be assigned to an internal combustion engine and with a device for admixing a liquid reducing agent into an exhaust gas of the internal combustion engine that is routed through the exhaust pipe.
  • Dosing valves are used for aftertreatment of the exhaust gas stream from motor vehicles by means of selective catalytic reduction (SCR) in order to introduce reducing agents, in particular an aqueous urea solution, into the exhaust system of the motor vehicle to reduce nitrogen oxides.
  • SCR selective catalytic reduction
  • reducing agents in particular an aqueous urea solution
  • It is known for certain temperature control Components of the devices and arrangements mentioned are to provide a protective wall, in particular in the form of double-walled end faces or metal sheets, between the metering valve and the exhaust gas pipe, which thermally decouples the metering valve from the exhaust line at least in certain areas, so that overheating of the metering valve used can be reliably prevented.
  • EP 2 212 012 B1 discloses a generic device for admixing a reducing agent into an exhaust gas flow of an internal combustion engine with a casing body of the exhaust pipe, which encloses the reducing agent at least in certain areas in the interior volume, and the casing body can be heated electrically and/or by an exhaust gas.
  • the device according to the invention with the features of claim 1 is characterized in that the metering module has a liquid cooling system with at least one coolant channel extending through the metering module separately from the reducing agent channel.
  • the use of a liquid cooling system with a coolant channel extending through the metering module separately from the reducing agent channel results in the advantage that overheating of components of the device, in particular the metering valve, is reliably prevented.
  • At least one component of the metering valve, in particular a valve tip of the metering valve is preferably actively cooled by means of the coolant circuit formed by the liquid cooling system.
  • the metering valve has a protective wall arranged coaxially to the valve tip, which is preferably arranged as a sheet metal essentially covering the valve tip in the area in which the device opens into the exhaust system of the motor vehicle.
  • the temperature of the protective wall can be influenced in such a way that deposits of the reducing agent used for exhaust gas aftertreatment located on the protective wall are removed or avoided.
  • a cooling medium in particular a coolant for cooling the internal combustion engine or the reducing agent itself, is guided through the coolant channel by means of the liquid cooling system in order to dissipate the heat from the exhaust gas, exhaust pipe and the hot environment.
  • the invention therefore provides that the temperature of the protective wall arranged between the valve tip and the exhaust pipe can be influenced in such a way that the critical components of the device, in particular the metering valve, can be sufficiently cooled at hot operating points with a high operating load of the internal combustion engine, and at the same time at cold operating points with a low operating load of the internal combustion engine and/or at a low temperature of the coolant, the sections or surfaces of the metering valve facing the exhaust pipe are not cooled too much.
  • this is achieved in that the device assigned to the metering valve for influencing the temperature of the protective wall can adjust the temperature in a targeted manner in the area of the protective wall or in the area of the end face of the metering device facing the exhaust pipe, thereby achieving the advantages mentioned above.
  • the device has an electrical heating device which is assigned to the protective wall.
  • the electrical heating device By assigning the electrical heating device to the protective wall, it is advantageously ensured that the temperature of the protective wall can be influenced in a targeted manner, so that the protective wall or the end face of the metering valve can be temperature-controlled depending on the operating point. If the operating situation of the motor vehicle leads to overcooling of the front face of the metering valve, i.e. to a low temperature on the front face and thus to a high risk of deposits of the reducing agent forming on the front face, the protective wall can be heated electrically.
  • the heating preferably takes place at least until the temperature of the protective wall has risen to a value which prevents the further formation of deposits and at which deposits present can evaporate.
  • This value is in particular more than 130°C. are up to that If deposits of the reducing agent, in particular urea, are already present on the protective wall if this value is exceeded, they are melted and can run off or are removed by shear stresses in the exhaust gas flow. Newly arriving droplets of the reducing agent evaporate so that there is no renewed wall film application, i.e. no deposits of the reducing agent.
  • the electrical heating device is arranged in particular in such a way that the valve tip is not additionally heated.
  • the electrical heating device is preferably controlled based on a thermal equivalent model, which calculates a temperature of the protective wall depending on a temperature of the coolant, a flow rate of the coolant, a temperature of the exhaust gas near the metering point and depending on the exhaust gas mass flow. These input variables are preferably available in a control unit assigned to the heating device or the device. If the calculated temperature of the protective wall falls below a predetermined temperature threshold, in particular 130° C., the electrical heating device is activated. If a higher temperature is exceeded, which can also be specified, the heating is deactivated again. Excess heat is preferably given off via a heat sink to the coolant flowing through the coolant channel.
  • the heating device has at least one heating wire, which is arranged to run on the rear side of the protective wall facing the metering valve.
  • the arrangement of the heating wire on the rear side of the protective wall facing the metering valve advantageously ensures that the heating wire or the electrical heating device does not protrude into the exhaust pipe and does not come into contact with either the reducing agent or the exhaust gas flow. Due to its electrical resistance, the heating wire experiences ohmic self-heating under the influence of current. The heating wire is thus protected against a reaction with the reducing agent or the exhaust gas flow.
  • the temperature of the protective wall can be advantageously adjusted by a targeted control of the heating wire.
  • the heating wire is designed to run in a spiral or meandering shape.
  • the spiral or meandering design of the heating wire advantageously ensures that the protective wall is heated evenly.
  • the heating wire preferably runs uniformly over the entire surface of the protective wall or, depending on a requirement for the heating output, at a specific point on the face that is thermally stressed to a lesser or greater extent, so that the heating output over the face is advantageously optimized.
  • the device has a bypass channel for the coolant system, the coolant channel extending through the dosing module in the region of the valve tip or close to the valve tip, and the bypass channel being spaced apart from the coolant channel and the valve tip through the dosing module runs, wherein the bypass channel is assigned at least one controllable valve for releasing or closing the bypass channel and for closing or releasing the coolant channel.
  • the electrical heating device is preferably dispensed with.
  • the bypass channel with a valve is provided in addition to the electric heater.
  • the valve for releasing or closing the bypass channel and for closing or releasing the coolant channel is preferably designed as a common valve, in particular as a 3/2-way valve, with three connections and two switching positions. In a first switching position, the bypass channel is closed and the coolant channel is released or connected to a supply line for the coolant. In a second switching position, the bypass channel is connected to the supply line and the coolant channel is closed.
  • the valve is actuated in particular in such a way that the coolant flow is not guided along the valve tip of the metering valve, but is diverted via the bypass channel.
  • the coolant is preferably guided through the coolant channel to limit the critical temperatures at the metering valve close to the exhaust gas flow and close to the metering valve.
  • the coolant flow is routed back via the bypass from the coolant inlet directly into the coolant return, without the coolant flowing through the area of the heat sink close to the metering valve.
  • the hydraulic pressure loss of the coolant in both coolant paths is advantageously comparable, so that the valve for the bypass channel is switched without any repercussions on the cooling circuit.
  • a throttle is preferably provided in the bypass channel.
  • the switching of the valve is preferably based on an active switching with modeled temperatures of the protective wall, as described above for the electrical heating device, alternatively the use of a temperature-controlled passive switching, in particular with a bimetal, is envisaged.
  • the switchable valve of the bypass channel thus advantageously makes it possible to conduct the coolant, depending on the operating situation, not close to the valve tip but through a bypass channel at a distance from it. Instead of switching off the cooling system of the valve, a flow of coolant is diverted so that certain areas of the valve continue to be cooled by the flow of coolant.
  • a control unit which is designed to activate the valve as a function of an exhaust gas temperature.
  • the design of the control unit for controlling the valve as a function of the exhaust gas temperature ensures advantageous temperature control of the metering valve.
  • the actuation by the control device is preferably based on a modeling of the temperature of the protective wall, which is calculated as a function of coolant temperature, coolant flow rate, exhaust gas temperature near the metering point and exhaust gas mass flow, as already mentioned above.
  • the control described is preferably carried out by the Control unit also used to control the additional or alternative electric heater.
  • the protective wall is designed in the shape of a plate, in particular in the shape of a circular ring plate, in order to bridge a radial distance between the valve tip and the exhaust gas pipe in the opening. Due to the plate shape of the protective wall, it extends in particular in such a way that it bridges a distance between the valve tip and the edge of an opening in the exhaust pipe, through which the exhaust gas aftertreatment agent can be injected into the exhaust gas flowing through the exhaust pipe, and thereby seals the opening towards the metering valve .
  • the protective wall has, for example, an annular bearing section which is designed to rest on the outside of the exhaust pipe, and an annular contact section which bears against the metering valve.
  • the protective wall is made of metal, in particular as a protective plate.
  • the formation of the protective wall from metal advantageously ensures that the protective wall has a high level of stability and robustness with respect to environmental influences, in particular due to temperature fluctuations and/or contact with the reducing agent and the exhaust gas.
  • the formation of the protective wall from metal offers advantageous heat conduction, which ensures optimal distribution of the thermal energy emanating in particular from the electrical heating device in the protective wall.
  • the protective wall has a U-shaped ring cross-section.
  • the protective wall has a casing wall both on its outer circumference and on its inner circumference inner casing wall for lateral contact with the metering valve, for example on the valve tip or a heat sink assigned to the valve tip.
  • at least the outer casing wall also has a radially projecting collar, in particular at its free end, which serves as a stop or bearing surface for bearing on the outside of the exhaust pipe, as already described above.
  • the protective wall is arranged on a heat sink of the metering module, with the coolant channel and/or the bypass channel running through the heat sink and the reducing agent channel running through the metering valve, which is arranged in the heat sink.
  • the arrangement according to the invention for an exhaust gas aftertreatment system with an exhaust pipe that can be assigned to an internal combustion engine and with a device for admixing a liquid solvent into an exhaust gas of the internal combustion engine leading through the exhaust pipe, is characterized by the features of claim 11 in that the device is designed according to the invention.
  • the protective wall fills or covers the radial distance between the metering valve, in particular the heat sink of the metering valve, and the exhaust pipe in the opening of the exhaust pipe.
  • FIG. 1 shows a device for admixing a liquid reducing agent into an exhaust pipe of an internal combustion engine with an electric heating device
  • Figure 2 shows the device with a bypass channel for a coolant system
  • FIG. 3 shows a further view of the device with the bypass channel.
  • FIG. 1 shows a device 1 with a metering module 3 for admixing a liquid reducing agent into an exhaust pipe 2 of an internal combustion engine, not shown.
  • the dosing module 3 has a controllable dosing valve 7 which has a valve tip 4 assigned to the exhaust pipe 2 .
  • FIG. 1 shows a section of the metering valve 7 in the area of the valve tip 4, additionally in an enlarged representation indicated by dot-dash lines.
  • the valve tip 4 has a valve opening 5 in which a reducing agent channel 6 ends.
  • the reducing agent channel 6 runs through the metering valve 7.
  • the valve opening 5 in the reducing agent channel 6 is assigned a valve element 27, in particular a valve needle, for opening and closing the valve opening 5, which is mounted so that it can slide longitudinally, as indicated by a double arrow 28.
  • a protective wall 8 arranged coaxially to the valve tip 4 is also assigned to the metering valve 7 .
  • the protective wall 8 is plate-shaped and has a U-shaped cross section. The protective wall 8 is partially inserted into an opening in a wall of the exhaust pipe 2 so that the protective wall 8 covers the radial distance between the metering valve 7 and the wall of the exhaust pipe 2 and thus closes the opening in the wall.
  • the protective wall 8 Due to the U-shaped cross-section, the protective wall 8 has an outer casing wall 23 and an inner casing wall 24 assigned to the metering valve 7 .
  • the casing wall 23 bears in particular laterally against the wall of the exhaust gas pipe 2 in the opening in order to close off as tightly as possible.
  • the protective wall 8 also has a radially outwardly projecting collar 25 which serves to rest on an outer side 26 of the exhaust gas pipe 2 .
  • a device 9 for influencing the temperature of the protective wall 8 is assigned to the metering valve 7 .
  • the device 9 has an electrical heating device 10 which is assigned to the protective wall 8 .
  • the electrical heating device 10 has one or more heating wires 11 which are arranged to run on the rear side of the protective wall 8 facing the metering valve 7 .
  • the heating wire or wires 11 are preferably designed to run in a spiral or meandering manner.
  • the metering module 3 also has a liquid cooling system 12 with a heat sink 13.
  • the heat sink 13 surrounds the metering valve 7 on the circumference and is made of a material with high thermal conductivity, such as aluminum. In the area of the valve tip 4 , the heat sink 13 bears against the outside of the valve tip 4 in order to ensure an advantageous heat transfer from the valve tip to the heat sink 13 .
  • the protective wall 8 is designed in such a way that it covers the heat sink and, according to the present exemplary embodiment of FIG. 1, is also fastened on its inside only to the heat sink 13 and not to the metering valve 7 itself. Alternatively, the protective wall 8 is alternatively or additionally fastened directly to the metering valve 7 .
  • a coolant channel 14 of the coolant system 12 runs in the heat sink 13 and extends through the dosing module 3 separately from the reducing agent channel 6 .
  • the protective wall 8 is preferably designed as a metal protective sheet with high thermal conductivity.
  • the protective wall 8 is heated by the heating wires 11 of the electrical heating device 10 when the temperature of the end face 15 of the metering valve 7 is so low that there is a risk of residues of a reducing agent being deposited on the protective wall 8 .
  • the electrical heating device 10 is preferably actuated by a control unit (not shown), which determines a temperature of the protective wall 8 as a function of the temperature of the coolant, by means of the flow rate of the coolant, the temperature of the exhaust gas near the valve tip 4 and/or the mass flow of the exhaust gas calculated. If the calculated temperature of the protective wall 8 falls below a predetermined threshold, for example 130° C., the heating wires 11 of the electrical heating device 10 are subjected to a predetermined electrical current, so that they experience ohmic self-heating due to their electrical resistance and heat the protective wall 8. If another predetermined higher temperature is exceeded, the heating wires 11 are no longer energized and the electrical heating device 10 is therefore no longer used to heat the protective wall 8 .
  • a control unit not shown
  • FIG. 2 shows the device with a bypass channel 20 for the coolant system 12.
  • the direction of a coolant inlet 16 is indicated by arrow 17.
  • the direction of a coolant return 18 is indicated by an arrow 19 .
  • a bypass channel 20 is provided between the coolant inlet 16 and the coolant return 18, between which the coolant channel 14 extends.
  • a valve 21 for releasing or closing the bypass passage 20 and for closing or releasing the coolant passage 14 is assigned to the bypass passage 20 .
  • the valve 21 - shown only schematically in Figure 2 - is presently designed as a 3/2-way valve, with three connections and two switching positions for the coolant channel 14 and the bypass channel 20.
  • the coolant channel 14 runs through the heat sink 13.
  • the valve 21 is now switched in such a way that the coolant channel 14 is closed and the bypass channel 20 is open, the coolant is now not guided through the valve tip 4 or past the valve tip 4, but instead flows from the coolant inlet 16 via the bypass channel 20 directly into the coolant return 18.
  • Bypass channel 20 in the cooling body 13 influences which areas of the metering valve 7 continue to be cooled.
  • FIG. 3 shows a further view of the device with the bypass channel 20 for the coolant system.
  • the coolant inlet 16 and the coolant return 18 are indicated by the arrows 17, 19 accordingly.
  • a regular coolant path 22 is indicated by emphasis. If the valve 21 is now brought into a first switching position, the bypass channel 20 is closed and the coolant channel 14 is opened. The coolant now flows along the coolant path 22 and cools the metering valve 7 or the valve element 27 and valve tip 4 (not shown) as intended. If the valve 21 is now brought into a second switching position, the bypass channel 20 is opened and the coolant channel 14 below the bypass channel 20 is closed, so that the coolant now flows from the coolant inlet 16 via the bypass channel 20 to the coolant return 18 .
  • the areas of the metering valve 7 lying along this path continue to be cooled.
  • the protective wall 8 can be heated by the heat from the exhaust gas, since the coolant no longer flows through the area of the heat sink 13 close to the metering valve. The heat dissipation by the coolant is thus reduced in this area and thus overall.
  • the switching or activation of the valve 21 is preferably carried out on the basis of a modeling of the temperature of the protective wall 8, as described above for the electrical heating device 10.
  • a temperature-controlled circuit with a bimetal is also conceivable.

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

Abstract

L'invention concerne un dispositif (1) pour l'ajout d'un agent réducteur liquide dans un tuyau de gaz d'échappement (2) d'un moteur à combustion interne, avec un module de dosage (3) qui comprend une valve doseuse actionnable (7), la valve doseuse (7) comprenant une extrémité de soupape (4) qui peut être fixée au tuyau de gaz d'échappement (2) et qui présente une ouverture de soupape (5) dans laquelle un conduit d'agent réducteur (6) se termine, la valve doseuse (7) comprenant une paroi de protection (8) qui est disposée de manière coaxiale par rapport à l'extrémité de soupape (4) et qui peut être introduite au moins dans des zones dans une ouverture du tuyau de gaz d'échappement (2), et un dispositif (9), associé à la valve doseuse (7), pour influencer la température de la paroi de protection (8). Il est prévu que le module de dosage (3) comprenne un système de refroidissement de liquide (12), avec au moins un conduit de fluide de refroidissement (14) qui se prolonge à travers le module de dosage (3) séparément du conduit d'agent de réduction (6).
PCT/EP2021/076079 2020-11-18 2021-09-22 Dispositif pour l'ajout d'un agent de réduction liquide dans un tuyau de gaz d'échappement d'un moteur à combustion interne, agencement pour un système de post-traitement de gaz d'échappement Ceased WO2022106098A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020214468.0 2020-11-18
DE102020214468.0A DE102020214468A1 (de) 2020-11-18 2020-11-18 Vorrichtung zum Zumischen eines flüssigen Reduktionsmittels in ein Abgasrohr einer Brennkraftmaschine, Anordnung für ein Abgasnachbehandlungssystem

Publications (1)

Publication Number Publication Date
WO2022106098A1 true WO2022106098A1 (fr) 2022-05-27

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PCT/EP2021/076079 Ceased WO2022106098A1 (fr) 2020-11-18 2021-09-22 Dispositif pour l'ajout d'un agent de réduction liquide dans un tuyau de gaz d'échappement d'un moteur à combustion interne, agencement pour un système de post-traitement de gaz d'échappement

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DE (1) DE102020214468A1 (fr)
WO (1) WO2022106098A1 (fr)

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DE102008055190A1 (de) * 2008-01-28 2009-07-30 Denso Corporation, Kariya Montageaufbau für ein Einspritzventil
WO2012099313A1 (fr) * 2011-01-18 2012-07-26 파카코리아 주식회사 Appareil de réduction des gaz d'échappement dans un moteur diesel
EP2878777A1 (fr) * 2012-07-02 2015-06-03 Doosan Corporation Injecteur de carburant pour filtre à particules diesel
EP2212012B1 (fr) 2007-11-30 2016-10-05 Bayerische Motoren Werke Aktiengesellschaft Dispositif pour ajouter un agent de réduction à un flux de gaz d'échappement dans un moteur à combustion interne
CN109630238A (zh) * 2019-01-28 2019-04-16 浙江科博达工业有限公司 燃油喷射雾化装置

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