CN111305939A - Exhaust gas aftertreatment device with lean NOx trap upstream of turbocharger - Google Patents

Exhaust gas aftertreatment device with lean NOx trap upstream of turbocharger Download PDF

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Publication number
CN111305939A
CN111305939A CN201911272574.3A CN201911272574A CN111305939A CN 111305939 A CN111305939 A CN 111305939A CN 201911272574 A CN201911272574 A CN 201911272574A CN 111305939 A CN111305939 A CN 111305939A
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CN
China
Prior art keywords
exhaust gas
turbocharger
temperature
aftertreatment device
gas aftertreatment
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Pending
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CN201911272574.3A
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Chinese (zh)
Inventor
罗伯特·屋罗佩茨
简·哈尔姆森
玛丽亚·阿尔米恩多
叶夫根尼·斯米尔诺夫
马里奥·贝尔诺维奇
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Ford Global Technologies LLC
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Ford Global Technologies LLC
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Publication of CN111305939A publication Critical patent/CN111305939A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • 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
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • 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 ; Methods of operation or control of catalytic converters
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • 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
    • 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
    • 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
    • Y02T10/40—Engine management systems

Landscapes

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

Abstract

The invention describes an exhaust gas aftertreatment device (2) for an internal combustion engine (1), the exhaust gas aftertreatment device (2) comprising an inlet, wherein a lean NOx trap (4) is arranged downstream of the inlet, a turbocharger (3) is arranged downstream of the lean NOx trap (4) and an SCR catalyst (7) and a urea injection device (14) are arranged downstream of the turbocharger (3).

Description

Exhaust gas aftertreatment device with lean NOx trap upstream of turbocharger
Technical Field
The invention relates to an exhaust gas aftertreatment device, a method for operating an exhaust gas aftertreatment device, an internal combustion engine arrangement and a motor vehicle.
Background
For motor vehicles driven by internal combustion engines, exhaust gas aftertreatment is of critical importance. In particular, increasing emission standards require increasing the quality of exhaust gas aftertreatment. In particular, exhaust aftertreatment during the cold start phase is challenging because at cold start, typically many catalysts have not yet reached the light-off or operating temperature of the catalyst. This applies in particular to the Diesel Oxidation Catalysts (DOC) and selective catalytic reduction catalysts (SCR) which are generally used.
Furthermore, it is common practice to recirculate exhaust gases, for example as high-pressure exhaust gas recirculation or low-pressure exhaust gas recirculation. In this case, too, a corresponding exhaust gas aftertreatment must be ensured. For this purpose, patent document US 9,957,866B 2 discloses an exhaust aftertreatment system in which a diesel oxidation catalyst is arranged upstream of a turbocharger. An SCR catalyst and a Diesel Particulate Filter (DPF) are arranged downstream of the turbocharger.
Disclosure of Invention
Under such circumstances, it is an object of the present invention to provide a further improved exhaust gas aftertreatment device which allows an improved exhaust gas aftertreatment, in particular in cold start conditions. A further object is to propose an advantageous method for operating an exhaust-gas aftertreatment device, an advantageous internal combustion engine arrangement and a motor vehicle.
These objects are achieved by an exhaust gas aftertreatment device for an internal combustion engine according to claim 1, a method for operating an exhaust gas aftertreatment device according to claim 6, an internal combustion engine arrangement according to claim 10 and a motor vehicle according to claim 12. The dependent claims contain further advantageous embodiments of the invention.
The exhaust gas aftertreatment device according to the invention is designed for an internal combustion engine and comprises an inlet. A lean NOx trap is disposed downstream of the inlet. The turbocharger is arranged downstream of the lean NOx trap and the SCR catalyst and the urea injection device are arranged downstream of the turbocharger, wherein the urea injection device is advantageously arranged upstream of the SCR catalyst. Preferably, the inlet is designed to be fluidly connected to an exhaust manifold of the internal combustion engine. The provision of a lean NOx trap upstream of the turbocharger may improve the overall removal of health and environmental harmful emissions from the exhaust gas, and particularly under cold start conditions. Also, the high temperature and pressure of the exhaust gas upstream of the turbocharger increases the amount of nitrogen oxides stored in the catalyst.
In one advantageous development, the exhaust gas aftertreatment device is configured such that the inlet comprises an exhaust manifold and the lean NOx trap is integrated in the exhaust manifold. This is advantageous firstly with respect to installation space, and secondly the higher exhaust gas temperature and the higher exhaust gas pressure can increase the amount of NOx stored.
In another variant, a diesel oxidation catalyst and/or a diesel particulate filter with an SCR coating are arranged downstream of the turbocharger and upstream of the SCR catalyst. These components contribute to optimal exhaust gas aftertreatment. In particular, the arrangement of the diesel oxidation catalyst directly downstream of the turbocharger or at the outlet of the turbocharger has the following advantages: due to the higher exhaust gas temperature at this location, the operating temperature of the diesel oxidation catalyst is reached quickly and the NO is increased as a result2the/NOx ratio. The diesel particulate filter may, for example, be configured as an activated diesel particulate filter having an SCR coating.
The diesel particulate filter (e.g. with an SCR coating) and the SCR catalyst may be arranged to be physically removed further from the turbocharger, in particular in the underfloor region, i.e. for example below the turbocharger and the lean NOx trap and/or connected to the exhaust gasBelow the internal combustion engine of the aftertreatment device. Furthermore, the arrangement of a diesel particulate filter and an SCR catalyst downstream of the turbocharger and the diesel oxidation catalyst has the following advantages: diesel oxidation catalysts can function at higher loads at lower operating temperatures and therefore have improved nitrogen oxide conversion. Furthermore, the arrangement described in the context of the present invention reduces the emission of carbon monoxide and unburned hydrocarbons. The performance of the SCR catalyst and the SCR coated diesel particulate filter disposed downstream is improved because the light-off temperature and operating temperature for carbon monoxide (CO) and Hydrocarbon (HC) conversion can be reached more quickly. This is because of the higher NO2Production, which is advantageous for fast selective catalytic reduction and reduces contamination of the SCR catalyst with hydrocarbons.
The fuel vaporizer may be disposed downstream of the turbocharger and upstream of the diesel oxidation catalyst. This allows post-injection of fuel upstream of the diesel oxidation catalyst and thus generates heat to heat the exhaust aftertreatment component, for example for regeneration of a diesel particulate filter.
For example, a temperature sensor and/or an oxygen sensor (lambda sensor), in particular a thermal element, may be arranged upstream of the lean NOx trap. Furthermore, a temperature sensor and/or an oxygen sensor, such as a thermal element, may be disposed downstream of the turbocharger and upstream of the SCR catalyst. The above-mentioned sensors are preferably connected to a control device, such as an Electronic Control Unit (ECU), and allow the exhaust gas aftertreatment device or the individual exhaust gas aftertreatment components to be controlled in accordance with the temperature and composition of the exhaust gas.
Another advantage of the described exhaust gas aftertreatment device is that an effective but short purge length of the lean NOx trap can be achieved and desulfation can be performed at lower temperatures.
The method for operating an exhaust gas aftertreatment device according to the invention as described above comprises the following steps. A first temperature of the exhaust gas is determined upstream of the lean NOx trap (e.g., at an inlet of the lean NOx trap). A second temperature of the exhaust gas is determined downstream of the turbocharger. If the second temperature is greater than the second temperature threshold, urea is injected upstream of the SCR catalyst. If the first temperature is greater than the first temperature threshold, the lean NOx trap is purged. The first temperature and the second temperature may be determined in any order or simultaneously. The injection of urea and purging of the lean NOx trap may also be performed in any order or simultaneously, depending on the respective temperatures.
The first temperature threshold may be at least 200 ℃. The second temperature threshold may be at least 180 ℃.
In a preferred variant, the second temperature of the exhaust gas downstream of the turbocharger is determined upstream of the SCR catalyst and/or the SCR-coated diesel particulate filter. Determining the temperature at this location or placing a corresponding temperature sensor directly upstream of the diesel particulate filter with the SCR coating and/or the SCR catalyst has the following advantages: the temperature is determined in close physical proximity to a component of the exhaust aftertreatment device associated with urea injection. Therefore, it is preferable that the second temperature of the exhaust gas is determined downstream of the diesel oxidation catalyst. Thus, when exhaust gas flows into a diesel particulate filter or SCR catalyst, the exhaust gas actually has the temperature required for injection of urea.
The internal combustion engine arrangement according to the invention comprises an internal combustion engine, preferably having an exhaust manifold, and an exhaust gas aftertreatment device as described above, which is arranged downstream of the internal combustion engine, in particular downstream of the exhaust manifold. Preferably, the internal combustion engine arrangement according to the invention is configured to perform the method according to the invention as described above.
The motor vehicle according to the invention comprises an internal combustion engine arrangement as described above. The internal combustion engine arrangement according to the invention and the motor vehicle according to the invention have the advantages already described in connection with the exhaust gas aftertreatment device according to the invention and the method according to the invention. The motor vehicle according to the invention may be a car, truck, motorcycle, moped, bus or minibus.
Drawings
The figures show:
fig. 1 schematically shows an internal combustion engine with an exhaust gas aftertreatment device according to the invention.
Fig. 2 shows the method according to the invention schematically in the form of a flow chart.
Fig. 3 schematically shows a motor vehicle according to the invention.
Detailed Description
Fig. 1 shows an internal combustion engine 1, which internal combustion engine 1 is fluidly connected to an exhaust gas aftertreatment device 2 according to the invention. The exhaust aftertreatment device 2 according to the invention comprises a turbocharger 3. The lean NOx trap 4 is disposed upstream of the turbocharger 3. A diesel oxidation catalyst 5 is disposed downstream of the turbocharger 3. A particulate filter 6, in particular a diesel particulate filter with an SCR coating, is arranged downstream of the diesel oxidation catalyst 5. A further exhaust gas aftertreatment device 7, for example at least one SCR catalyst, is arranged downstream of the particulate filter 6.
A fuel carburetor 8 for injecting fuel is provided upstream of the diesel oxidation catalyst 5 and downstream of the turbocharger 3. Furthermore, a first temperature sensor 9 and a first oxygen sensor 10 are provided upstream of the lean NOx trap 4. A second temperature sensor 11 and a second oxygen sensor 12 are provided downstream of the diesel oxidation catalyst 5 and upstream of the particulate filter 6 and the SCR catalyst 7. The temperature sensors 9 and 11 and the oxygen sensors 10 and 12 are connected to a control device 13, respectively. The internal combustion engine 1 is also connected to the control device 13. This is indicated in fig. 1 by a dashed line. The exhaust gas aftertreatment device can be controlled separately by means of the control device 13 according to the temperature of the exhaust gas and the composition of the exhaust gas and according to the operating state of the internal combustion engine 1. The internal combustion engine 1 may be, for example, a diesel engine.
In particular, the control of the above-mentioned exhaust gas aftertreatment device may comprise purging the lean NOx trap 4 and desulfating the lean NOx trap 4, and/or injecting fuel upstream of the diesel oxidation catalyst 5, and/or injecting urea upstream of the SCR catalysts 6, 7. A urea injection device 14 is arranged upstream of the SCR catalysts 6, 7.
In the context of the method shown in fig. 2, in a first step 15 a first temperature of the exhaust gas is determined upstream of the lean NOx trap 4. This can be determined, for example, using the first temperature sensor 9. Furthermore, in step 15, a second temperature of the exhaust gas is determined downstream of the turbocharger 3. This can be determined, for example, by means of a second temperature sensor 11, i.e. for example a second temperature sensor 11 downstream of the diesel oxidation catalyst 5 and upstream of the particulate filter 6 and the SCR catalyst 7.
In step 16 it is checked whether the second temperature is above a second temperature threshold. If so, then in step 17, urea is injected upstream of the first SCR catalyst (e.g., SCR coated diesel particulate filter 6). The second temperature threshold is preferably at least 180 ℃. If the second temperature is not above the second temperature threshold, it is checked in step 18 whether the first temperature is above the first temperature threshold. If so, the lean NOx trap is purged in step 19. The first temperature threshold is preferably at least 200 ℃. If the first temperature is not greater than the first temperature threshold, the method returns to step 15. Steps 16 and 18 may also be performed simultaneously or in reverse order. After steps 17 and 19, the method also returns to step 15.
The motor vehicle 20 shown in fig. 3 comprises an internal combustion engine 1, for example a diesel engine, and an exhaust gas aftertreatment device 2 according to the invention.
List of reference numerals
1 internal combustion engine
2 exhaust gas aftertreatment device
3 turbo charger
4 lean NOx trap
5 diesel oxidation catalyst
6 particulate filter
7 additional exhaust gas aftertreatment device
8 fuel carburetor
9 first temperature sensor
10 first oxygen sensor
11 second temperature sensor
12 second oxygen sensor
13 control device
14 urea injection device
15 determining a first exhaust temperature upstream of the lean NOx trap and a second exhaust temperature downstream of the turbocharger
16 is the second temperature above the second temperature threshold?
17 Urea injection upstream of SCR catalyst
18 is the first temperature above the first temperature threshold?
Purging of 19 lean NOx traps
20 Motor vehicle
J is
N is no

Claims (12)

1. An exhaust gas aftertreatment device (2) for an internal combustion engine (1), the exhaust gas aftertreatment device (2) comprising an inlet,
it is characterized in that the preparation method is characterized in that,
a lean NOx trap (4) is arranged downstream of the inlet, a turbocharger (3) is arranged downstream of the lean NOx trap (4), and an SCR catalyst (7) and a urea injection device (14) are arranged downstream of the turbocharger (3).
2. The exhaust gas aftertreatment device (2) of the preceding claim,
it is characterized in that the preparation method is characterized in that,
the inlet comprises an exhaust manifold, and the lean NOx trap (4) is integrated in the exhaust manifold.
3. The exhaust gas aftertreatment device (2) of any one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
downstream of the turbocharger (3) and upstream of the SCR catalyst (7) a diesel oxidation catalyst (5) and/or a diesel particulate filter (6) with an SCR coating are arranged.
4. The exhaust gas aftertreatment device (2) of the preceding claim,
it is characterized in that the preparation method is characterized in that,
a fuel vaporizer (8) is provided downstream of the turbocharger (3) and upstream of the diesel oxidation catalyst (5).
5. The exhaust gas aftertreatment device (2) of any one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
a temperature sensor (9) and/or an oxygen sensor (10) is arranged upstream of the lean NOx trap (4), and a temperature sensor (11) and/or an oxygen sensor (12) is arranged downstream of the turbocharger (4) and upstream of the SCR catalyst (7).
6. Method for operating an exhaust gas aftertreatment device (2) according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
the method comprises the following steps:
-determining (15) a first temperature of the exhaust gas upstream of the lean NOx trap (4),
-determining (15) a second temperature of the exhaust gas downstream of the turbocharger (4),
-injecting (17) urea upstream of the SCR catalyst (7) if the second temperature is higher than a second temperature threshold (16),
-purging (19) the lean NOx-trap if the first temperature is higher than a first temperature threshold (18).
7. The method according to the preceding claim, wherein,
it is characterized in that the preparation method is characterized in that,
the exhaust gas temperature downstream of the turbocharger (4) is determined upstream of the SCR catalyst (7) and/or the SCR-coated diesel particulate filter (6).
8. The method according to any one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
the exhaust gas temperature downstream of the turbocharger (4) is determined downstream of a diesel oxidation catalyst (5) arranged downstream of the turbocharger (4).
9. Method according to any one of the preceding claims
It is characterized in that the preparation method is characterized in that,
the first temperature threshold is at least 200 degrees celsius (200 ℃) and/or the second temperature threshold is at least 180 degrees celsius (180 ℃).
10. An internal combustion engine arrangement comprising an internal combustion engine (1) and an exhaust gas aftertreatment device (2) according to any one of claims 1 to 5 arranged downstream of the internal combustion engine (1).
11. Internal combustion engine arrangement according to the preceding claim, arranged to perform a method according to any one of claims 6 to 9.
12. Motor vehicle (20), the motor vehicle (20) comprising an internal combustion engine device according to the preceding claim.
CN201911272574.3A 2018-12-12 2019-12-12 Exhaust gas aftertreatment device with lean NOx trap upstream of turbocharger Pending CN111305939A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018221555 2018-12-12
DE102018221555.3 2018-12-12

Publications (1)

Publication Number Publication Date
CN111305939A true CN111305939A (en) 2020-06-19

Family

ID=71150724

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911272574.3A Pending CN111305939A (en) 2018-12-12 2019-12-12 Exhaust gas aftertreatment device with lean NOx trap upstream of turbocharger

Country Status (1)

Country Link
CN (1) CN111305939A (en)

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Application publication date: 20200619