WO2024256523A1 - Dispositif de post-traitement de gaz d'échappement - Google Patents

Dispositif de post-traitement de gaz d'échappement Download PDF

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Publication number
WO2024256523A1
WO2024256523A1 PCT/EP2024/066336 EP2024066336W WO2024256523A1 WO 2024256523 A1 WO2024256523 A1 WO 2024256523A1 EP 2024066336 W EP2024066336 W EP 2024066336W WO 2024256523 A1 WO2024256523 A1 WO 2024256523A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid passage
exhaust gas
aftertreatment device
gas aftertreatment
unit
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/EP2024/066336
Other languages
English (en)
Inventor
Adam THERNING
Johan Assiks
Julia CLAESSON
Nicklas WERNER
Urban Persson
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.)
Volvo Penta AB
Original Assignee
Volvo Penta AB
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
Priority claimed from SE2350737A external-priority patent/SE2350737A1/en
Application filed by Volvo Penta AB filed Critical Volvo Penta AB
Publication of WO2024256523A1 publication Critical patent/WO2024256523A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F01N3/08—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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features 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
    • 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
    • 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
    • F01N2470/00—Structure or shape of exhaust 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
    • F01N2610/02—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
    • F01N2610/102—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance after addition to exhaust gases, e.g. by a passively or actively heated surface in the exhaust conduit

Definitions

  • the disclosure relates generally to emission control of internal combustion engines.
  • the disclosure relates to an exhaust gas aftertreatment device, a vehicle and a method of operating the exhaust gas aftertreatment device.
  • the disclosure can be applied to heavy-duty vehicles, such as trucks, buses, and construction equipment, among other vehicle types.
  • heavy-duty vehicles such as trucks, buses, and construction equipment, among other vehicle types.
  • Exhaust aftertreatment systems are used in vehicles, such as trucks and buses, to reduce harmful emissions from internal combustion engines. These systems typically comprise one or more aftertreatment units for treating the exhaust gases, such as Diesel Oxidation Catalyst (DOC) units, diesel particulate filters (DPF), Selective Catalyst Reduction (SCR) units, and ammonia slip catalysts (ASC) units.
  • DOC Diesel Oxidation Catalyst
  • DPF diesel particulate filters
  • SCR Selective Catalyst Reduction
  • ASC ammonia slip catalysts
  • an exhaust gas aftertreatment device comprises:
  • an inner pipe having an inner periphery and an outer periphery, wherein the inner periphery defines an inner fluid passage being configured to channel exhaust gases flowing in a first direction
  • an outer pipe enclosing the inner pipe and having an inner periphery
  • an outer fluid passage is formed in a space between the inner periphery of the outer pipe and the outer periphery of the inner pipe, the outer fluid passage being configured to channel the exhaust gases flowing in a second direction that is substantially opposite to the first direction
  • a gas mixer which diverts the exhaust gases flowing from the inner fluid passage to the outer fluid passage, or diverts the exhaust gases flowing from the outer fluid passage to the inner fluid passage, wherein the gas mixer comprises at least one opening through which a nitric oxide reduction agent is arranged to be injected.
  • the first aspect of the disclosure may seek to provide an improved exhaust gas aftertreatment device with a compact configuration, which may allow the exhaust gases to be treated in an efficient and effective manner in a single device.
  • a technical benefit may include improved efficiency of exhaust gas treatment.
  • Another technical benefit may include easy packaging and installation of the exhaust gas aftertreatment device.
  • the technical benefit is achieved by providing two distinct fluid passages, namely the inner fluid passage and the outer fluid passage, which may make it possible to place different aftertreatment units in the respective fluid passage and treat the exhaust gases multiple times within a single device. Furthermore, by channeling the exhaust gas flow in the outer fluid passage in a direction that is substantially opposite to a direction of the exhaust gas flow in the inner passage, it may enhance a heat transfer between the exhaust gas flow in the inner fluid passage and the exhaust gas flow in the outer fluid passage due to the countercurrent flow pattern. This may further improve efficiency of the treatment process.
  • the gas mixer is configured such that a gas mixture of the exhaust gases and the nitric oxide reduction agent undergoes at least one expansion and at least one compression when passing through the gas mixer.
  • turbulence may be formed within the gas mixer which may promote mixing of the exhaust gases, and the nitric oxide reduction agent.
  • a technical benefit may include improved efficiency of NO X reduction, leading to lower emissions.
  • the gas mixer comprises a first chamber having a body extending along a central axis being parallel to the first direction.
  • the first chamber comprises an inlet for receiving exhaust gases flowing from the inner fluid passage, and the inlet has an extension extending between a first inlet end and second inlet end, preferably along the central axis of the body of the first chamber.
  • a cross- sectional area of the first inlet end is different, preferably larger, than a cross-sectional area of the second inlet end, and the cross-sectional area of the second inlet end is different, preferably smaller, than a cross-sectional area of the body of the first chamber.
  • the inlet may have a third end that may be fluidly connected to the body of the first chamber. The exhaust gases and the injected nitric oxide reduction agent may undergo one compression when flowing from the first inlet end to the second inlet end due to a decreased cross-sectional area.
  • the exhaust gas flow and the injected nitric oxide reduction agent may undergo one expansion when flowing from the second inlet end to the body of the first chamber due to an increased cross-sectional area.
  • the turbulence may be formed within the first chamber, which may promote the mixing of the exhaust gases and the nitric oxide reduction agent.
  • a technical benefit may include an enhanced mixing of the exhaust gases and the nitric oxide reduction agent, which may lead to improved efficiency of NO X reduction.
  • the first chamber further comprises an outlet which has an extension extending between a first outlet end and a second outlet end, preferably along the central axis of the body of the first chamber.
  • the outlet may be fluidly connected to the first chamber.
  • a cross- sectional area of the first outlet end of the first chamber is different, preferably larger, than a cross-sectional area of the second outlet end of the first chamber.
  • the gas mixture may further experience one compression when passing from the body to the outlet of the first chamber, due to a decreased cross-sectional area.
  • a technical benefit may include an enhanced mixing of the exhaust gases and the nitric oxide reduction agent, which may lead to improved efficiency of NO X reduction.
  • At least one aftertreatment unit for treating the exhaust gases is disposed in the inner fluid passage, and at least one aftertreatment unit for treating the exhaust gases is disposed in the outer fluid passage.
  • the aftertreatment units disposed in the fluid passages may refer to any type of units that may be used to reduce emissions of harmful pollutants from a combustion engine. Different aftertreatment units may be selected and be placed in the respective passage, depending on the emissions from an engine.
  • the aftertreatment unit may contain any suitable catalysts for treating the exhaust gases. Purely by way of examples, diesel oxidation catalyst may be used to oxidize harmful emissions such as hydrocarbon or carbon monoxide in the exhaust gases.
  • selective catalyst reduction may be used, together with the injected nitric oxide reduction agent, to convert harmful nitrogen oxides to harmless nitrogen and water.
  • the aftertreatment unit may be a diesel particulate filter DPF which may work to capture and store particulate matter, such as soot, from the exhaust gases. In this way, the exhaust gases may be treated in an efficient and effective manner within a single device.
  • a technical benefit may include improved efficiency of exhaust gas treatment.
  • the exhaust gas aftertreatment device further comprises a heating arrangement configured to heat the at least one aftertreatment unit disposed in the inner fluid passage to a first temperature being within a first temperature range and/or to heat the at least one aftertreatment unit disposed in the outer fluid passage to a second temperature being within a second temperature range.
  • a heating arrangement configured to heat the at least one aftertreatment unit disposed in the inner fluid passage to a first temperature being within a first temperature range and/or to heat the at least one aftertreatment unit disposed in the outer fluid passage to a second temperature being within a second temperature range.
  • an exhaust gas aftertreatment device may operate at a temperature which may be optimized for a first aftertreatment unit. However, the temperature may be unnecessarily high for a second aftertreatment unit. This may result in energy wastage.
  • the heating arrangement it may be possible to have each one of the aftertreatment units operating at its own preferred temperature. As a result, such energy wastage may be avoided or mitigated.
  • a technical benefit may include improved energy efficiency.
  • the first temperature range
  • the at least one aftertreatment unit disposed in the inner fluid passage and the at least one aftertreatment unit disposed in the outer fluid passage are formed by an electrically conductive material
  • the heating arrangement comprises at least one inductive heating element, such that when the at least one inductive heating element is supplied with an electrical current, eddy currents are induced within the at least one aftertreatment unit disposed in the inner fluid passage and/or the at least one aftertreatment unit disposed in the outer fluid passage, resulting in the heating of the at least one aftertreatment unit disposed in the inner fluid passage and/or the at least one aftertreatment unit disposed in the outer fluid passage.
  • the at least one inductive heating element comprises a first induction heating coil, such as an electromagnetic spiral coil, wound around the outer periphery of the inner pipe.
  • a technical benefit may include uniform heating throughout the at least one aftertreatment unit disposed in the inner fluid passage. This may result in enhanced heating efficiency of the at least one aftertreatment unit in the inner fluid passage.
  • the exhaust gas aftertreatment device further comprises a wall, the wall being arranged such that an accommodation space between the wall and the outer periphery of the inner pipe is formed to accommodate the first induction heating coil.
  • a technical benefit may include that, by incorporating such a wall, a closed space may be formed to accommodate the first induction heating coil. Consequently, it may prevent any exhaust gas from passing through this enclosed space in the absence of an aftertreatment unit. This may result in a reduced risk of untreated exhaust gases.
  • the at least one inductive heating element further comprises a second induction heating coil, such as an electromagnetic spiral coil, wound around the outer periphery of the outer pipe.
  • a technical benefit may include enhanced heating efficiency of the at least one aftertreatment unit in the outer fluid passage.
  • the exhaust gas aftertreatment device is provided with a power source configured to supply an electrical current to the first induction heating coil and/or the second induction heating coil.
  • the exhaust gas aftertreatment device is further provided with a control unit configured to control the power source to selectively supply an electric current to the first induction heating coil for a first time duration and/or to selectively supply an electric current to the second induction heating coil for a second time duration.
  • a control unit configured to control the power source to selectively supply an electric current to the first induction heating coil for a first time duration and/or to selectively supply an electric current to the second induction heating coil for a second time duration.
  • each one of the at least one aftertreatment unit may be heated to its own working temperature.
  • a technical benefit may include a more precise temperature control for the at least one aftertreatment unit within the inner fluid passage and the at least one aftertreatment unit within in the outer fluid passage.
  • the gas mixer is removably coupled to the exhaust gas aftertreatment device.
  • the gas mixer may be coupled to the exhaust gas treatment device via a V-clamp. As such, it may allow periodic inspection, cleaning, and replacement of the aftertreatment units without replacing the whole exhaust gas aftertreatment device.
  • a technical benefit may include easy maintenance of the exhaust gas aftertreatment device.
  • the exhaust gas aftertreatment device is provided with a heat exchanger configured to exchange heat with the exhaust gases exiting the exhaust gas aftertreatment and to heat at least a portion of the exhaust gases that are going to enter the exhaust gas aftertreatment.
  • the heat exchanger may utilize thermal energy from the treated exhaust gases exiting the exhaust gas aftertreatment device to pre-heat the incoming exhaust gases.
  • a technical benefit may include improved energy efficiency.
  • a method of operating the exhaust gas aftertreatment device comprises a heating arrangement configured to heat the at least one aftertreatment unit disposed in the inner fluid passage to a first temperature being within a first temperature range and/or to heat the at least one aftertreatment unit disposed in the outer fluid passage to a second temperature being within a second temperature range.
  • the method comprises:
  • first temperature range corresponds to a working temperature range of the at least one aftertreatment unit disposed in the inner fluid passage
  • second temperature range corresponds to a working temperature range of the at least one aftertreatment unit disposed in the outer fluid passage
  • the method may be performed in response to receiving a signal which indicates that an engine is going to start.
  • the exhaust gas aftertreatment device may be well prepared before the exhaust gases enters the device.
  • a technical benefit may include improved efficiency of exhaust gas treatment.
  • the heating arraignment arrangement comprises a first induction heating coil, such as an electromagnetic spiral coil, wound around the outer periphery of the inner pipe, and a second induction heating coil, such as an electromagnetic spiral coil, wound around the outer periphery of the outer pipe.
  • the exhaust gas aftertreatment device is provided with a power source and a control unit. The method further comprises:
  • control unit controlling, by the control unit, the power source to supply an electrical current with a first power level to the first induction heating coil
  • control unit controlling, by the control unit, the power source to supply an electrical current with a second power level to the second induction heating coil
  • control unit controlling, by the control unit, the power source to terminate supplying the electric current to the induction heating coil for the at least one aftertreatment unit that has reached the temperature that is within its working temperature range.
  • receiving a signal indicating which one of the at least one aftertreatment unit has reached a temperature within its working temperature range further comprises receiving information related to a time duration for which each one of the first induction heating coil and the second the second induction heating coil has been supplied with an electrical current.
  • receiving a signal indicating which one of the at least one aftertreatment unit has reached a temperature within its working temperature range further comprises: receiving information related to a temperature at the inner fluid passage and/or related to a temperature at the outer fluid passage.
  • FIG. 1 is a schematic side view of an exemplary vehicle.
  • FIG. 2 is a sectional view of an exemplary exhaust gas aftertreatment device.
  • FIG. 4 illustrates yet another example of an exhaust gas aftertreatment device, where the exhaust gases enter the exhaust gas aftertreatment device through an outer fluid passage and exit the exhaust gas aftertreatment device from a tubular fluid passage.
  • FIG. 5 illustrates an exhaust gas aftertreatment device arranged in a housing in accordance with an example of the present disclosure.
  • FIG. 6 is a schematic view showing a power source for supplying power to induction heating elements.
  • FIG. 7a and FIG. 7b are flow charts illustrating a method of operating an exhaust gas aftertreatment device.
  • FIG. 8 is a schematic diagram of an exemplary computer system for implementing methods disclosed herein.
  • Exhaust aftertreatment systems are used in vehicles, such as trucks and buses, to reduce harmful emissions from internal combustion engines. These systems typically comprise one or more aftertreatment units for treating the exhaust gases, such as Diesel Oxidation Catalyst (DOC) units, diesel particulate filters (DPF), Selective Catalyst Reduction (SCR) units, and ammonia slip catalysts (ASC) units.
  • DOC Diesel Oxidation Catalyst
  • DPF diesel particulate filters
  • SCR Selective Catalyst Reduction
  • ASC ammonia slip catalysts
  • a DOC unit may be used to oxidize harmful emissions such as hydrocarbon (HC), carbon monoxide (CO), and Nitric Oxide (NO) from exhaust gases into less harmful substances, and a DPF unit may then collect and remove particles, such as soot and ash, from the exhaust gases. Thereafter, a SCR unit may be used to reduce remaining NO X emissions, e.g., nitric oxide (NO) and nitrogen dioxide (NO2), by converting them into nitrogen and oxygen. Typically, a SCR unit is used in conjunction with a nitric oxide reduction agent, such as urea.
  • NO nitric oxide
  • NO2 nitrogen dioxide
  • a SCR unit is used in conjunction with a nitric oxide reduction agent, such as urea.
  • the urea undergoes a chemical reaction that produces ammonia, which is then used in the SCR unit to reduce a level of harmful NO X .
  • the urea may break down into ammonia slip (NH3) and an ASC unit may be provided to convert the ammonia slip (NH3) into harmless nitrogen (N2) and water (H2O).
  • the present disclosure may seek to provide an improved exhaust gas aftertreatment device with a compact configuration, which may allow the exhaust gases to be treated in an efficient and effective manner in a single device.
  • a technical benefit may include improved efficiency of exhaust gas treatment.
  • FIG. 1 depicts a vehicle 100, which is exemplified by a truck. Even though a truck is shown, it shall be noted that the disclosure is not limited to this type of vehicle, but it may also be used for other vehicles, such as a bus, or construction equipment, e.g., a wheel loader or an excavator. In some examples, the vehicle may be a marine vessel, e.g., a ship or a boat.
  • the vehicle 100 comprises an internal combustion engine 150, configured to provide power for propelling the vehicle 100.
  • the combustion engine 150 may be of any suitable type, for instance a diesel engine or a gasoline engine.
  • the vehicle 100 further comprises an exhaust gas aftertreatment device 200, configured to treat the exhaust gases exiting the internal combustion engine 150, in order to reduce harmful emissions to the environment.
  • the exhaust gas aftertreatment device 200 may comprise different aftertreatment units.
  • diesel engines emit higher levels of nitrogen oxides (NOx), particulate matter (PM), and other harmful pollutants than gasoline engines.
  • Gasoline engines typically emit higher levels of volatile organic compounds (VOCs) and carbon monoxide (CO) than diesel engines.
  • VOCs volatile organic compounds
  • CO carbon monoxide
  • a diesel engine may require a DOC unit, a DPF, a SCR unit and/or an ASC unit to effectively reduce emissions of hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOx), and particulate matter (PM), while a gasoline engine may require a three-way catalytic converter to reduce emissions of HC, CO, and NO X .
  • FIG. 2 shows a sectional view of an exemplary exhaust gas aftertreatment device 200 and FIG. 3 illustrates an inner part of the exemplary exhaust gas aftertreatment device 200 of FIG. 2.
  • the exhaust gas aftertreatment device 200 in FIG. 1 may be the exhaust gas aftertreatment device 200 in FIG. 2.
  • the exhaust gas aftertreatment device 200 comprises an inner pipe 202.
  • the inner pipe 202 has an inner periphery 202A and an outer periphery 202B, whereby the inner periphery 202A defines an inner fluid passage 206, such as a tubular fluid passage, configured to channel exhaust gases flowing in a first direction, as indicated by arrows in FIG. 2 illustrating a first flow direction.
  • at least one aftertreatment unit 230, 232 for treating the exhaust gases is disposed in the inner fluid passage 206.
  • the illustrated example shows a diesel oxidation catalyst unit (DOC) 230 and a diesel particulate filter (DPF) 232 disposed in the inner fluid passage 206, whereby the DPF 232 is arranged downstream the DOC 230, as seen in the direction of exhaust gas flow.
  • the inner fluid passage 206 may have a circular cross-section that forms a tubular fluid passage. However, it may have any other suitable shape, such as square or rectangular.
  • the exhaust gas aftertreatment device 200 further comprises an outer pipe 204 enclosing the inner pipe 202.
  • the outer pipe 204 comprises an inner periphery 204A and an outer periphery 204B.
  • An outer fluid passage 208 such as an annular fluid passage, is formed in a space between the inner periphery 204A of the outer pipe 204 and the outer periphery 202B of the inner pipe 202.
  • the outer fluid passage 208 is configured to channel the exhaust gases flowing in a second direction substantially opposite to the first direction, as indicated by arrows illustrating a second flow direction.
  • At least one aftertreatment unit 234, 236 for treating the exhaust gases is disposed in the outer fluid passage 208, and in the shown examples, a selective catalytic reduction unit (SCR) 234 and an ammonia slip catalyst unit (ASC) 236 are disposed in the outer fluid passage 208, whereby the ASC 236 is arranged downstream the SCR 234, as seen in the direction of exhaust gases flow.
  • SCR selective catalytic reduction unit
  • ASC ammonia slip catalyst unit
  • the exhaust gas aftertreatment device 200 comprises a gas mixer 220 which diverts the exhaust gases flowing from the inner fluid passage 206 to the outer fluid passage 208, as shown in FIG. 2, or diverts the exhaust gases flowing from the outer fluid passage 308 to the inner fluid passage 306, as shown in FIG. 4.
  • the gas mixer 216 comprises at least one opening 226 through which a nitric oxide reduction agent is arranged to be injected.
  • the nitric oxide reduction agent may for instance be urea, which may undergo a chemical reaction that produces ammonia. The ammonia may then be used in the SCR unit to reduce a level of the harmful NO X .
  • the gas mixer 220 is configured such that a gas mixture of the exhaust gases and the nitric oxide reduction agent undergoes at least one expansion and at least one compression when passing through the gas mixer 220. As such, turbulence may be formed within the gas mixer 220, which may promote mixing of the exhaust gases and the nitric oxide reduction agent.
  • the gas mixer 220 comprises a first chamber 216 having a body 216’ extending along a central axis x.
  • the central axis x is parallel to the first direction of exhaust gases flow.
  • the first chamber 216 comprises an inlet 213 A for receiving exhaust gas flowing from the inner fluid passage 206, whereby the inlet 213 A has an extension extending between a first inlet end 212 and second inlet end 214 along the central axis x of the body 216’ of the first chamber 216. (see FIG. 3)
  • a cross- sectional area of the first inlet end 212 is larger than a cross-sectional area of the second inlet end 214.
  • the cross-sectional area of the second inlet end 214 is smaller than a cross-sectional area of the body 216’ of the first chamber 216.
  • the gas mixture may experience one compression and one expansion when passing from the first inlet end 212 to the body 216’ of the first chamber 216.
  • the first chamber 216 comprises an outlet 213B which has an extension extending between a first outlet end 242 and a second outlet end 244, along the central axis x of the body 216’ (see FIG. 3).
  • a cross-sectional area of the first outlet end 242 is larger than a cross-sectional area of the second outlet end 244.
  • the gas mixture may further experience one compression when passing through the outlet 213B of the first chamber 216.
  • the gas mixer 220 may comprise a second chamber 210 that diverts the exhaust gases flowing from the first chamber 216 to the outer fluid passage 208.
  • the gas mixer 220 comprises a flow deflector member 218 attached to the outlet 213B of the first chamber 216.
  • the flow deflector member 218 is configured to divert the gas mixture from the first chamber 216 into the outer fluid passage 208 via the second chamber 210.
  • the flow deflector member 218 may comprise a cylindrical member 217 extending along the central axis x, whereby the cylindrical member 217 may comprise a plurality of openings 219 that may be distributed about the circumference of the cylindrical member 217.
  • the cylindrical member 217 may be securely fastened to an inner wall 221 of the second chamber 220, allowing the gas mixer 220 to be constructed as a single unit.
  • the exhaust gas aftertreatment device 200 may comprise a heating arrangement 350 configured to heat the at least one aftertreatment unit 230, 232 disposed in the inner fluid passage 206 to a first temperature being within a first temperature range and/or to heat the at least one aftertreatment unit 234, 236 disposed in the outer fluid passage 208 to a second temperature being within a second temperature range.
  • the first temperature range may correspond to a working temperature range of the SCR 234 and the DPF 236, which is typically 200-600 °C and the second temperature range may correspond to a working temperature range of the SCR 234 and the ASC 236, which is typically 300-500 °C . Therefore, the first temperature may be set to 200°C, which is within the range of 200-600 °C, and the second temperature may be set to 300°C, which is within the range of 300-500 °C.
  • the first temperature range partly overlaps with the second temperature range.
  • the first temperature range may correspond to the second temperature range.
  • the first temperature range may be completely different from the second temperature range.
  • the at least one aftertreatment unit 230, 232 disposed in the inner fluid passage 206 and the at least one aftertreatment unit 234, 236 disposed in the outer fluid passage 208 are formed by an electrically conductive material.
  • each one of the DOC 230, the DPF 232, the SCR 234, and the ASC 236 may be coated with a metal material, such as a thin metal layer.
  • the heating arrangement 350 comprises at least one inductive heating element 222, 224, such that when the at least one inductive heating element 222, 224, is supplied with an electrical current, eddy currents are induced within the at least one aftertreatment unit 230, 232 disposed in the inner fluid passage 206 and/or the at least one aftertreatment unit 234, 236 disposed in the outer fluid passage 208, resulting in the heating of the at least one aftertreatment unit 230, 232 disposed in the inner fluid passage 206 and/or the at least one aftertreatment unit disposed 234, 236 in the outer fluid passage 208.
  • the at least one inductive heating element 222, 224 may comprise a first induction heating coil 222, such as an electromagnetic spiral coil, wound around the outer periphery 202B of the inner pipe 202.
  • the inner pipe 202 has an extension extending between a first inner pipe end 202C and a second inner pipe end 202D along its central axis x.
  • the first induction heating coil 222 may comprise spiral loops that are also extending between the first inner pipe end 202C and the second inner pipe end 202D along the same central axis x. In this way, uniform heating over the at least one aftertreatment unit 230, 232 may be achieved.
  • the exhaust aftertreatment device 200 may comprise a wall 240 arranged such that a space 241, preferably a closed space 241 between the wall 240 and the outer periphery 202B of the inner pipe 202 is formed to accommodate the first induction heating coil 222. In this way, it may prevent any exhaust gas from passing through this enclosed space 241 with no aftertreatment units.
  • the at least one inductive heating element 222, 224 may further comprise a second induction heating coil 224, such as an electromagnetic spiral coil, wound around the outer periphery 204B, of the outer pipe 204.
  • the outer pipe 204 has an extension extending between a first outer pipe end 204C and a second outer pipe end 204D along its central axis x.
  • the second induction heating coil 224 may comprise spiral loops that are also extending between the first outer pipe end 204C and the second outer pipe end 204D along the same central axis x. In this way, uniform heating over the at least one aftertreatment unit 234, 236 may be achieved.
  • the exhaust gas aftertreatment device 200 may be provided with a power source 250 (see FIG. 6) configured to supply an electrical current to the first induction heating coil 222 and/or the second induction heating coil 224.
  • the exhaust gas aftertreatment device 200 may further be provided with a control unit 251 (see FIG. 6) configured to control the power source 250 to selectively supply an electric current to the first induction heating coil 222 for a first time duration and/or to selectively supply an electric current to the second induction heating coil 224 for a second time duration.
  • FIG. 6 schematically shows an example of the arrangement of the power source 250 and the induction heating coils 222, 224.
  • the power source 250 for instance, a high-voltage battery, is configured to supply power to each one of the first and the second induction heating coils 222 224 through a first circuit 222B and a second circuit 224B, respectively, whereby the first circuit 222B is connected to the second circuit 224B in parallel.
  • each one of the first circuit 222B and the second circuit 224B is provided with a first switch 222A and a second switch 224A, controllable to enable or disable the power supply to the first induction heating coil 222 and the second induction heating coil 224, respectively.
  • a time duration for supplying the power to the first induction heating coil 222 and/or the second induction heating coil 224 may then be regulated by the control unit 251 through operation of the first switch 222 A and the second switch 224 A, independently.
  • each one of the first circuit 222B and the second circuit 224B may further be provided with a resistor with appropriate value to ensure that an electrical current with an appropriate power level is supplied to each one of the first induction heating coil 222 and/or the second induction heating coil 224.
  • pulse width modulation technology may be implemented to ensure that an electrical current with an appropriate power level is provided to each one of the first induction heating coil 222 and the second induction heating coil 224, respectively.
  • the power level of the electrical current supplied to the first induction heating coil 222 and to the second induction heating coil 224 may be regulated independently.
  • the time duration for supplying the power to the first induction heating coil 222 and to the second induction heating coil 222 may also or alternatively be regulated independently. Consequently, the resulting heat induced within the at least one aftertreatment unit 230, 232 disposed in the inner fluid passage 206 and/or the at least one aftertreatment unit 234, 236 disposed in the outer fluid passage 208 may be precisely controlled with high flexibility.
  • the exhaust gas aftertreatment device 200 may further comprise a gas inlet 201A and a gas outlet 201B.
  • the inner fluid passage 206 is fluidly connected to the inlet 201 A for receiving the exhaust gases from, for example, the internal combustion engine 150 shown in FIG. 1, and the outer fluid passage 208 is fluidly connected to an outlet 20 IB for discharging exhaust gas emissions after being treated in the exhaust gas aftertreatment device 200.
  • the exhaust gas aftertreatment device 200 may be provided with a heat exchanger 360 configured to exchange heat with the exhaust gases exiting the exhaust gas aftertreatment 200 and to heat at least a portion of the exhaust gases that are going to enter the exhaust gas aftertreatment device 200.
  • the heat exchanger may utilize thermal energy from the treated exhaust gases exiting the exhaust gas aftertreatment device to pre-heat the incoming exhaust gases.
  • the gas mixer 220 may be removably coupled to the exhaust gas aftertreatment device 200.
  • the gas mixer 220 may, for instance, be coupled to the exhaust gas treatment device 200 via a V-clamp (not shown), or any other clamping or attachment arrangement, at dash line A. As such, it may allow periodic inspection, cleaning, and replacement of the aftertreatment units 230, 232, 234, 236 without the need of replacing the whole exhaust gas aftertreatment device 200.
  • FIG. 4 shows another exemplary exhaust gas aftertreatment device 300. The shown example differs from that of FIG. 2 example in that it comprises a gas mixer 320 that does not comprise any flow deflector members. In general, a gas mixer without a flow deflector may simplify a maintenance procedure, making it easier to clean the gas mixer when the gas mixer is removed from the exhaust aftertreatment device 300.
  • the exhaust gases may enter the exhaust gas aftertreatment device 200 via an inlet 301 A, and flow to an outer fluid passage 308. Thereafter, the exhaust gases may be directed inward into an inner fluid passage 306 through a gas mixer 320 and exit the exhaust gas aftertreatment device 200 via an outlet 301B.
  • the inner fluid passage 206 is fluidly connected to the outlet 301B for discharging the exhaust gas emissions after being treated in the exhaust gas aftertreatment device 300
  • the outer fluid passage 308 is fluidly connected to the inlet 301A for receiving the exhaust gases from an internal combustion engine 150.
  • a first aftertreatment unit 330 is disposed in the inner fluid passage 306, and a second aftertreatment unit 334 disposed in the outer fluid passage 308.
  • a heating arrangement 350 is arranged to heat the first aftertreatment unit 330 to a first temperature range and/or to heat the second aftertreatment unit 334 to a second temperature range.
  • the heating arrangement 350 may comprise a first induction heating coil 322 and a second induction heating coil 324, respectively.
  • the first and second induction heating coils 322 324 are arranged such that when they are supplied with an electrical current, eddy currents are induced within the first aftertreatment unit 330 and/or the second aftertreatment unit 334, resulting in the heating of the first aftertreatment unit 334 and/or the second aftertreatment unit 330, respectively.
  • the exhaust gas aftertreatment device 300 is arranged in a housing 360, which is illustrated in FIG. 5.
  • the housing 360 may utilize an enveloping material, such as thermal insulation, to help maintain a temperature within the exhaust aftertreatment device 300.
  • FIG. 7a and FIG. 7b are flow chats illustrating a method of operating an exhaust gas aftertreatment device 200, such as the exhaust aftertreatment device 200 of FIG. 2.
  • the method may be performed by processing circuitry of a control unit, or computer system, such as the control unit 250 shown in FIG. 6 and comprises the actions listed in the following, which, unless otherwise indicated, may be taken in any suitable order.
  • the method may be performed in response to receiving a signal which indicates that an engine is going to start.
  • the exhaust gas aftertreatment device may be well prepared before the exhaust gases enters the device.
  • [66] Sla controlling the heating arrangement 350 to heat the at least one aftertreatment unit 230, 232 disposed in the inner fluid passage 206 to the first temperature.
  • the at least one aftertreatment unit 230, 232 may treat the exhaust gases when passing through the inner fluid passage 206 at the first temperature within a first temperature range which corresponds to a working temperature range of the at least one aftertreatment unit 230, 232 disposed in the inner fluid passage 206.
  • Sib controlling the heating arrangement 350 to heat the at least one aftertreatment unit 234, 236 disposed in the outer fluid passage 208 to the second temperature.
  • the at least one aftertreatment unit 234, 236 may treat the exhaust gases when passing through the outer fluid passage 208 at the second temperature, within a second temperature range which corresponds to a working temperature range of the at least one aftertreatment unit 234, 236 disposed in the outer fluid passage 208.
  • the first temperature may be set to 200°C, which is within the working temperature range 200-600 °C of the DOC 230 and the DPF 232.
  • the second temperature may be set to 300°C, which is within the working temperature range 300-500 °C of the SCR 234 and the ASC 236. Therefore, heating of the DOC 230 and the DPF 232, and heating of the SCR 234 and the ASC 236 may be controlled independent from each other.
  • the method may further comprise:
  • Sla-1 controlling the power source 250 to supply an electrical current with a first power level to the first induction heating coil 222.
  • Slb-1 controlling the power source 250 to supply an electrical current with a second power level to the second induction heating coil 224.
  • Sl-2 receiving a signal indicating which one of the at least one aftertreatment unit 230, 232, 234, 236 has reached a temperature that is within its working temperature range.
  • Sl-3 controlling the power source 250 to terminate supplying the electric current to the induction heating coil 222, 224 for the at least one aftertreatment unit 230, 232, 234, 236 that has reached a temperature that is within its working temperature range.
  • the first temperature may be set to 200°C
  • the second temperature may be set to 300°C
  • the first power level may be set to be lower than the second power level, accordingly.
  • the control unit 251 may control the power source 250 to terminate supplying the electric current to the first induction heating coil 222. For instance, the control unit 251 may issue a signal to close the first switch 222A. Thereafter, when a signal indicates that the SCR 234 and the DPF 236 have reached 300°C, the control unit 251 may control the power source 250 to terminate supplying the electric current to the second induction heating coil 224. For instance, the control unit 251 may issue a signal to close the second switch 224A.
  • receiving SI -2 a signal indicating which one of the at least one aftertreatment unit 230, 232 has reached a temperature within its working temperature range further comprises receiving SI -2a information related to a time duration for which each one of the first induction heating coil 222, and the second induction heating coil 224, has been supplied with an electrical current. This information may be obtained from a timer.
  • the signal may indicate, for example, the at least one aftertreatment unit 230, 232 disposed in the inner fluid passage 206 has reached the temperature within its working temperature range based on the received information and a predetermined time schedule, which defines a start time and a termination time for supplying an electrical current to each one of the first induction heating coil 222 and the second induction heating coil 224.
  • receiving SI -2 a signal indicating which one of the at least one aftertreatment unit 230, 232 has reached a temperature within its working temperature range further comprises: receiving SI -2b information related to a temperature at the inner fluid passage and/or related to a temperature at the outer fluid passage. This information may be obtained from a temperature detect means, for instance, temperature sensors positioned in any suitable locations.
  • FIG 8. illustrates a computer system 400, which may be seen as the control unit 251 for preforming the method.
  • the computer system 400 is adapted to execute instructions from a computer-readable medium to perform these and/or any of the functions or processing described herein.
  • the computer system 400 may be connected e.g., networked) to other machines in a LAN, an intranet, an extranet, or the Internet. While only a single device is illustrated, the computer system 400 may include any collection of devices that individually or jointly execute a set or multiple sets) of instructions to perform any one or more of the methodologies discussed herein.
  • any reference in the disclosure and/or claims to a computer system, computing system, computer device, computing device, control system, control unit, electronic control unit ECU), processor device, processing circuitry, etc. includes reference to one or more such devices to individually or jointly execute a set or multiple sets) of instructions to perform any one or more of the methodologies discussed herein.
  • the control system may include a single control unit or a plurality of control units connected or otherwise communicatively coupled to each other, such that any performed function may be distributed between the control units as desired.
  • such devices may communicate with each other or other devices by various system architectures, such as directly or via a Controller Area Network CAN) bus, etc.
  • the computer system 400 may comprise at least one computing device or electronic device capable of including firmware, hardware, and/or executing software instructions to implement the functionality described herein.
  • the computer system 400 may include processing circuitry 402 e.g., processing circuitry including one or more processor devices or control units), a memory 404, and a system bus 406.
  • the computer system 400 may include at least one computing device having the processing circuitry 402.
  • the system bus 406 provides an interface for system components including, but not limited to, the memory 404 and the processing circuitry 402.
  • the processing circuitry 402 may include any number of hardware components for conducting data or signal processing or for executing computer code stored in memory 404.
  • the processing circuitry 402 may, for example, include a general-purpose processor, an application specific processor, a Digital Signal Processor DSP), an Application Specific Integrated Circuit ASIC), a Field Programmable Gate Array FPGA), a circuit containing processing components, a group of distributed processing components, a group of distributed computers configured for processing, or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein.
  • the processing circuitry 402 may further include computer executable code that controls operation of the programmable device.
  • the system bus 406 may be any of several types of bus structures that may further interconnect to a memory bus with or without a memory controller), a peripheral bus, and/or a local bus using any of a variety of bus architectures.
  • the memory 404 may be one or more devices for storing data and/or computer code for completing or facilitating methods described herein.
  • the memory 404 may include database components, object code components, script components, or other types of information structure for supporting the various activities herein. Any distributed or local memory device may be utilized with the systems and methods of this description.
  • the memory 404 may be communicably connected to the processing circuitry 402 e.g., via a circuit or any other wired, wireless, or network connection) and may include computer code for executing one or more processes described herein.
  • the memory 404 may include non-volatile memory 408 e.g., read-only memory ROM), erasable programmable read-only memory EPROM), electrically erasable programmable read-only memory EEPROM), etc.), and volatile memory 410 e.g., randomaccess memory RAM)), or any other medium which can be used to carry or store desired program code in the form of machine-executable instructions or data structures and which can be accessed by a computer or other machine with processing circuitry 402.
  • a basic input/output system BIOS) 412 may be stored in the non-volatile memory 408 and can include the basic routines that help to transfer information between elements within the computer system 400.
  • the computer system 400 may further include or be coupled to a non-transitory computer-readable storage medium such as the storage device 414, which may comprise, for example, an internal or external hard disk drive HDD) e.g., enhanced integrated drive electronics EIDE) or serial advanced technology attachment SATA)), HDD e.g., EIDE or SATA) for storage, flash memory, or the like.
  • a non-transitory computer-readable storage medium such as the storage device 414, which may comprise, for example, an internal or external hard disk drive HDD) e.g., enhanced integrated drive electronics EIDE) or serial advanced technology attachment SATA)), HDD e.g., EIDE or SATA) for storage, flash memory, or the like.
  • HDD enhanced integrated drive electronics
  • SATA serial advanced technology attachment
  • the storage device 414 and other drives associated with computer-readable media and computer-usable media may provide nonvolatile storage of data, data structures, computer-executable instructions, and the like.
  • Computer-code which is hard or soft coded may be provided in the form of one or more modules.
  • the modules can be implemented as software and/or hard-coded in circuitry to implement the functionality described herein in whole or in part.
  • the modules may be stored in the storage device 414 and/or in the volatile memory 410, which may include an operating system 416 and/or one or more program modules 418.
  • All or a portion of the examples disclosed herein may be implemented as a computer program 420 stored on a transitory or non-transitory computer-usable or computer-readable storage medium e.g., single medium or multiple media), such as the storage device 414, which includes complex programming instructions e.g., complex computer-readable program code) to cause the processing circuitry 402 to carry out actions described herein.
  • the computer-readable program code of the computer program 420 can comprise software instructions for implementing the functionality of the examples described herein when executed by the processing circuitry 402.
  • the storage device 414 may be a computer program product e.g., readable storage medium) storing the computer program 420 thereon, where at least a portion of a computer program 420 may be loadable e.g., into a processor) for implementing the functionality of the examples described herein when executed by the processing circuitry 402.
  • the processing circuitry 402 may serve as a controller or control system for the computer system 400 that is to implement the functionality described herein.
  • the computer system 400 may include an input device interface 422 configured to receive input and selections to be communicated to the computer system 400 when executing instructions, such as from a keyboard, mouse, touch-sensitive surface, etc. Such input devices may be connected to the processing circuitry 402 through the input device interface 422 coupled to the system bus 406 but can be connected through other interfaces, such as a parallel port, an Institute of Electrical and Electronic Engineers IEEE) 1394 serial port, a Universal Serial Bus USB) port, an IR interface, and the like.
  • the computer system 400 may include an output device interface 424 configured to forward output, such as to a display, a video display unit e.g., a liquid crystal display LCD) or a cathode ray tube CRT)).
  • the computer system 400 may include a communications interface 426 suitable for communicating with a network as appropriate or desired.
  • Example 1 An exhaust gas aftertreatment device 200, 300, 400, comprising:
  • an inner pipe 202, 302, 402 having an inner periphery 202 A, 302 A, 402 A, and an outer periphery 202B, 302B, 402B, wherein the inner periphery 202A, 302A, 402A defines a tubular inner fluid passage 206, 306, 406 being configured to channel exhaust gases flowing in a first direction, wherein at least one aftertreatment unit 230, 232, 330, 430, 432 for treating the exhaust gases is disposed in the tubular inner fluid passage 206, 306, 406,
  • annular outer fluid passage 208,308, 408 is configured to channel the exhaust gases flowing in a second direction that is substantially opposite to the first direction, wherein at least one aftertreatment unit 234, 236, 334, 436, 434 for treating the exhaust gases is disposed in the outer fluid passage 208,308, 408, and
  • gas mixer 220, 320, 420 which diverts the exhaust gases flowing from the tubular inner fluid passage 206, 306 to the annular outer fluid passage 208, 308 or diverts the exhaust gases flowing from the annular outer fluid passage 408 to the tubular inner fluid passage 406, wherein the gas mixer 220, 320, 420 comprises at least one opening 226, 326, 426 arranged to inject a nitric oxide reduction agent into the gas mixer 220, 320, 420, such that the nitric oxide reduction agent is mixed with the exhaust gases within the gas mixer 220, 320, 420.
  • Example 2 The exhaust gas aftertreatment device 200, 300, 400 of Example 1, wherein the gas mixer 220, 320, 420 is arranged to form a turbulence in a gas mixture of the exhaust gases and the injected nitric oxide reduction agent, such that mixing of the exhaust gases and the injected nitric oxide reduction agent is promoted.
  • Example 3 The exhaust gas aftertreatment device 200, 300, 400 of Example 1 or 2, wherein the gas mixer 220, 320, 420 is removably coupled to the exhaust gas aftertreatment device 200, 300, 400.
  • Example 4 The exhaust gas aftertreatment device 200, 300, 400 of any one of the preceding Examples, further comprising at least one inductive heating element, configured to heat the at least one aftertreatment units 230, 232, 234, 236, 330, 334, 430, 434 for treating the exhaust gases disposed in the tubular inner fluid passage 206, 306, 406 and/or disposed in the annular outer fluid passage 208, 308, 408.
  • Example 5 The exhaust gas aftertreatment device 200 of Example 4, wherein the at least one inductive heating element comprises at least a first electromagnetic spiral coil 222, 322, 422 and a second electromagnetic spiral coil 224, 324, 424.
  • Example 6 The exhaust gas aftertreatment device 200 of Example 5, wherein the first electromagnetic spiral coil 222, 322, 422 is arranged around the outer periphery 202B, 302B, 402B of the inner pipe 202, 302, 402 and wherein the second electromagnetic spiral coil 224, 324, 424 is arranged around the outer periphery 204B, 304B, 404B of the outer pipe 204, 304, 404.
  • Example 7 The exhaust gas aftertreatment device 200 of Example 6, wherein the first electromagnetic spiral coil 222, 322, 422 and the second electromagnetic spiral coil 224, 324, 424 are arranged to be independently controlled.
  • Example 8 The exhaust gas aftertreatment device 200, 300, 400 of any one the preceding Examples, further comprising a heat exchanger connected to receive exhaust gases exiting the exhaust gas aftertreatment device 200, 300, 400 and arranged to heat at least a portion of the exhaust gases that are going to enter the exhaust gas aftertreatment device 200, 300, 400.
  • Example 9 The exhaust gas aftertreatment device 200, 300 of any one of the preceding Examples, wherein the tubular inner fluid passage 206, 306 is fluidly connected to an inlet 201A, 301A for receiving the exhaust gases from an internal combustion engine 150, and wherein the annular outer fluid passage 208, 308 is fluidly connected to an outlet 201B, 301B for discharging exhaust gas emissions after being treated in the exhaust gas aftertreatment device 200, 300.
  • Example 10 The exhaust gas aftertreatment device 200, 300 of any one of the preceding Examples, wherein the gas mixer 220, 320 is arranged downstream of the tubular inner fluid passage 206, 306.
  • Example 11 The exhaust gas aftertreatment device 200, 300 according to Example 10, wherein the gas mixer 220, 320 comprises a first chamber 216, 316 and a second chamber 220, 320, wherein the first chamber 216, 316 is positioned within the second chamber 220, 320.
  • Example 12 The exhaust gas aftertreatment device 200, 300 of Example 11, wherein the first chamber 216, 316 comprises a cylindrical chamber body 216’, 316’, which is defined by a cylindrical wall 216”, 316” extending along a central axis X of the tubular inner fluid passage 206, 306.
  • Example 13 The exhaust gas aftertreatment device 200, 300 of Example 12, wherein the first chamber 216, 316 further comprises an inlet 213 A, 313 A and an outlet 213B, 313B, wherein the inlet 213 A, 313 A comprises a first end 212, 312 and a second end 214, 314, wherein the first end 212, 312 of the inlet 213 A, 313 A is fluidly connected to the tubular inner fluid passage 206, 306, being configured to receive the exhaust gases from the tubular inner fluid passage 206, 306, and wherein the second end 214, 314 of the inlet 213 A, 313 A is fluidly connected to the cylindrical chamber body of the first chamber 216, 316.
  • Example 14 The exhaust gas aftertreatment device 200, 300 of Example 13, wherein the first chamber 216, 316 is arranged such that a gas mixture of the exhaust gases and the nitric oxide reduction agent undergoes at least one expansion and at least one compression within the cylindrical chamber body 216’, 316’ and a turbulence is formed thereafter in the gas mixture.
  • Example 15 The exhaust gas aftertreatment device 200, 300 of Example 14, wherein a cross-sectional area of the first end 212, 312 of the inlet 213 A, 313 A of the first chamber 216, 316 is larger than a cross-sectional area of the second end 214, 314 of the inlet 213 A, 313 A of the first chamber 216, 316, and wherein the cross-sectional area of the second end 214, 314 of the inlet 213 A, 313 A of the first chamber 216, 316 is smaller than a cross- sectional area of the cylindrical chamber body 216’, 316’ of the first chamber 216, 316.
  • Example 16 The exhaust gas aftertreatment device 200, 300 of Example 15, wherein a cross-sectional area of the outlet 213B, 313B of the first chamber 216, 316 is smaller than the cross-sectional area of the cylindrical chamber body 216’, 316’ of the first chamber 216, 316.
  • Example 17 The exhaust gas aftertreatment device 200, 300 of any one of Examples 11-16, wherein the gas mixer 220, 320 further comprises a flow deflector member 218 attached to the outlet of the first chamber 216, 316, the flow deflector member 218 being configured to divert the gas mixture from the first chamber 216, 316 into the annular outer fluid passage 208, 308 via the second chamber 220.
  • the gas mixer 220, 320 further comprises a flow deflector member 218 attached to the outlet of the first chamber 216, 316, the flow deflector member 218 being configured to divert the gas mixture from the first chamber 216, 316 into the annular outer fluid passage 208, 308 via the second chamber 220.
  • Example 18 The exhaust gas aftertreatment device 200, 300 of Example 17, wherein the flow deflector member 218 comprises a cylindrical plate 217 extending along a central axis X of the tubular inner fluid passage 206, 306, wherein the cylindrical plate 217 comprises a plurality of openings 2019 having a flow direction along a radial direction of the cylindrical plate.
  • Example 19 The exhaust gas aftertreatment device 200 of any one of the preceding Examples, wherein at least two aftertreatment units 230, 232 are disposed in the tubular inner fluid passage 206, 306, the at least two aftertreatment units 230, 232 comprising a diesel oxidation catalyst unit 230 and a diesel particulate filter 232, wherein the diesel particulate filter 232 is arranged downstream of the diesel oxidation catalyst unit 230.
  • Example 20 The exhaust gas aftertreatment device 200 according to anyone of the preceding Examples, wherein at least two aftertreatment units 232, 236 are disposed in the annular outer fluid passage 208, 308, the at least two aftertreatment units 232, 236 comprising a selective catalytic reduction unit 232 and an ammonia slip catalyst unit 236, wherein the ammonia slip catalyst unit 236 is arranged downstream of the selective catalytic reduction unit 232.
  • Example 21 The exhaust gas aftertreatment device 400 of anyone of Examples 1- 8, wherein the tubular inner fluid passage 406 is fluidly connected to an outlet 40 IB for discharging the exhaust gas emissions after being treated in the exhaust gas aftertreatment device 400 and the annular outer fluid passage 408 is fluidly connected to an inlet 401A for receiving the exhaust gases from an internal combustion engine 150.
  • Example 23 The exhaust gas aftertreatment device of Example 22 or Example 23, wherein at least two aftertreatment units 434, 436 are disposed in the annular outer fluid passage 408, the at least two aftertreatment units 434, 436 comprising a diesel oxidation catalyst unit 436 and a diesel particulate filter 434, and wherein the diesel particulate filter 434 is arranged downstream of the diesel oxidation catalyst unit 436.
  • Example 24 A vehicle 100 comprising the exhaust gas aftertreatment device 200, 300, 400 of anyone of the preceding Examples.
  • an inner pipe (202) having an inner periphery (202A) and an outer periphery (202B), wherein the inner periphery (202A) defines an inner fluid passage (206) configured to channel exhaust gases flowing in a first direction, wherein at least one aftertreatment unit (230, 232) for treating the exhaust gases is disposed in the inner fluid passage (206),
  • an outer pipe (204) having an inner periphery (204A), wherein an outer fluid passage (208) is formed in a space between the inner periphery (204A) of the outer pipe (204) and the outer periphery (202B) of the inner pipe (202), the outer fluid passage (208) being configured to channel the exhaust gases flowing in a second direction substantially opposite to the first direction, wherein at least one aftertreatment unit (234, 236) for treating the exhaust gases is disposed in the outer fluid passage (208), - a gas mixer (216) which diverts the exhaust gases flowing from the inner fluid passage (206) to the outer fluid passage (208) or diverts the exhaust gases flowing from the outer fluid passage (208) to the inner fluid passage (206), and
  • Item 3 The exhaust gas aftertreatment device (200) according to Item 2, wherein the first temperature range is different from the second temperature range.
  • Item 4 The exhaust gas aftertreatment device (200) according to any one of Items 1-3, wherein the at least one aftertreatment unit (230, 232) disposed in the inner fluid passage (206) and the at least one aftertreatment unit (234, 236) disposed in the outer fluid passage (208) are formed by an electrically conductive material.
  • Item 5 The exhaust gas aftertreatment device (200) according to Item 4, wherein the heating arrangement comprises at least one inductive heating element (222, 224), such that when the at least one inductive heating element (222, 224) is supplied with an electrical current, eddy currents are induced within the at least one aftertreatment unit (230, 232) disposed in the inner fluid passage (206) and/or the at least one aftertreatment unit (234, 236) disposed in the outer fluid passage (208), resulting in the heating of the at least one aftertreatment unit (230, 232) disposed in the inner fluid passage (206) and/or the at least one aftertreatment unit disposed (234, 236) in the outer fluid passage (208).
  • the heating arrangement comprises at least one inductive heating element (222, 224), such that when the at least one inductive heating element (222, 224) is supplied with an electrical current, eddy currents are induced within the at least one aftertreatment unit (230, 232) disposed in the inner fluid passage (206) and/or the at least one aftertreatment unit (234,
  • Item 6 The exhaust gas aftertreatment device (200) according to Item 6, wherein the at least one inductive heating element (222, 224) comprises a first induction heating coil (222), such as an electromagnetic spiral coil, wound around the outer periphery (202B) of the inner pipe (202).
  • a first induction heating coil such as an electromagnetic spiral coil
  • Item 7 The exhaust gas aftertreatment device (200) according to Item 6, further comprising a wall forming a space between the wall and the outer periphery of the inner pipe (202) to accommodate the first induction heating coil (222).
  • Item 8 The exhaust gas aftertreatment device (200) according to any one of Items 6-7, wherein the at least one inductive heating element (222, 224) further comprises a second induction heating coil (224), such as an electromagnetic spiral coil, wound around the outer periphery (204B) of the outer pipe (204).
  • a second induction heating coil such as an electromagnetic spiral coil
  • Item 9 The exhaust gas aftertreatment device (200) according to Items 6-8, wherein the exhaust gas aftertreatment device (200) is provided with a power source (250) configured to supply an electrical current to the first induction heating coil (222) and/or the second induction heating coil (224).
  • a power source 250
  • the exhaust gas aftertreatment device (200) is provided with a power source (250) configured to supply an electrical current to the first induction heating coil (222) and/or the second induction heating coil (224).
  • Item 10 The exhaust gas aftertreatment device (200) according to Item 9, wherein the exhaust gas aftertreatment device (200) is further provided with a control unit (251) configured to control the power source (250) to selectively supply an electric current to the first induction heating coil (222) for a first time duration and/or to selectively supply an electric current to the second induction heating coil (224) for a second time duration.
  • a control unit 251 configured to control the power source (250) to selectively supply an electric current to the first induction heating coil (222) for a first time duration and/or to selectively supply an electric current to the second induction heating coil (224) for a second time duration.
  • Item 11 The exhaust gas aftertreatment device (200) according to any one of the preceding Items, wherein the at least one aftertreatment unit (230, 232) disposed in the inner fluid passage (206) comprises a diesel oxidation catalyst unit (230) and a diesel particulate filter (232), and wherein the diesel particulate filter (232) is arranged downstream of the diesel oxidation catalyst unit (230).
  • Item 12 The exhaust gas aftertreatment device (200) according to any one of the preceding Items, wherein the at least one aftertreatment unit (234, 236) disposed in the outer fluid passage (208) comprises a selective catalytic reduction unit (234) and an ammonia slip catalyst unit (236), wherein the ammonia slip catalyst unit (236) is arranged downstream of the selective catalytic reduction unit (234).
  • Item 13 A vehicle (100) comprising the exhaust gas aftertreatment device (200) according to any one of Items 1-12.
  • Item 14 A method of operating the exhaust gas aftertreatment device (200) according to any one of Items 1-12, comprising:
  • SI a the heating arrangement to heat the at least one aftertreatment unit (230, 232) disposed in the inner fluid passage (206) to the first temperature, such that the at least one aftertreatment unit (230, 232) treats the exhaust gases when passing through the inner fluid passage (206) at the first temperature
  • first temperature is within a first temperature range which corresponds to a working temperature range of the at least one aftertreatment unit (230, 232) disposed in the inner fluid passage (206)
  • second temperature is within a second temperature range which corresponds to a working temperature range of the at least one aftertreatment unit (234, 236) disposed in the outer fluid passage (208).
  • Item 15 The method according to Item 14, when dependent on Items 9-10, further comprising:
  • SI - controlling the power source (250) to terminate supplying the electric current to the induction heating coil (222, 224) for the at least one aftertreatment unit (230, 232, 234, 236) that has reached the temperature that is within its working temperature range.
  • Item 16 The method according to Item 15, wherein receiving (SI -2) a signal indicating which one of the at least one aftertreatment unit (230, 232) has reached a temperature within its working temperature range further comprises receiving (SI -2a) information related to a time duration for which each one of the first induction heating coil 222, and the second the second induction heating coil 224, has been supplied with an electrical current.
  • Item 17 The method according to Item 15, wherein receiving (SI -2) a signal indicating which one of the at least one aftertreatment unit (230, 232) has reached a temperature within its working temperature range further comprises: receiving (Sl-2b) information related to a temperature at the inner fluid passage and/or related to a temperature at the outer fluid passage.

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  • Chemical & Material Sciences (AREA)
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  • Exhaust Gas After Treatment (AREA)

Abstract

La présente invention concerne un dispositif de post-traitement de gaz d'échappement (200, 300). Ledit dispositif comprend : un tuyau interne (202, 302) ayant une périphérie interne (202A, 302A) et une périphérie externe (202B, 302B); un tuyau externe (204, 304) entourant le tuyau interne (202, 302) et ayant une périphérie interne (204A, 304A), un passage de fluide externe (208) étant formé dans un espace entre la périphérie interne (204A, 304A) du tuyau externe (204, 304) et la périphérie externe (202B, 302B) du tuyau interne (202, 302); et un mélangeur de gaz (220, 320) qui dévie les gaz d'échappement s'écoulant du passage de fluide interne (206) vers le passage de fluide externe (208) ou dévie les gaz d'échappement s'écoulant du passage de fluide externe (308) vers le passage de fluide interne (306). Ledit mélangeur de gaz (220, 320) comprend au moins une ouverture (226, 326) à travers laquelle un agent de réduction d'oxyde nitrique est agencé pour être injecté.
PCT/EP2024/066336 2023-06-16 2024-06-13 Dispositif de post-traitement de gaz d'échappement Ceased WO2024256523A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE2350737-9 2023-06-16
SE2350737A SE2350737A1 (en) 2023-06-16 2023-06-16 An exhaust gas aftertreatment device
SE2450383A SE2450383A1 (en) 2023-06-16 2024-04-12 An exhaust gas aftertreatment device
SE2450383-1 2024-04-12

Publications (1)

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WO2024256523A1 true WO2024256523A1 (fr) 2024-12-19

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004038192A1 (fr) * 2002-10-25 2004-05-06 Purem Abgassysteme Gmbh & Co. Kg Systeme de post-traitement de gaz d'echappement, notamment pour moteur diesel
DE112005002903B4 (de) * 2004-11-25 2010-01-28 Komatsu Ltd. Abgasreinigungsvorrichtung für Brennkraftmaschine
CN105402009A (zh) * 2015-12-17 2016-03-16 无锡威孚力达催化净化器有限责任公司 Scr催化器集成喷射用螺旋式混合器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004038192A1 (fr) * 2002-10-25 2004-05-06 Purem Abgassysteme Gmbh & Co. Kg Systeme de post-traitement de gaz d'echappement, notamment pour moteur diesel
DE112005002903B4 (de) * 2004-11-25 2010-01-28 Komatsu Ltd. Abgasreinigungsvorrichtung für Brennkraftmaschine
CN105402009A (zh) * 2015-12-17 2016-03-16 无锡威孚力达催化净化器有限责任公司 Scr催化器集成喷射用螺旋式混合器

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