CN111663983A - Method for operating an SCR catalyst having a bypass flow channel - Google Patents
Method for operating an SCR catalyst having a bypass flow channel Download PDFInfo
- Publication number
- CN111663983A CN111663983A CN202010145541.9A CN202010145541A CN111663983A CN 111663983 A CN111663983 A CN 111663983A CN 202010145541 A CN202010145541 A CN 202010145541A CN 111663983 A CN111663983 A CN 111663983A
- Authority
- CN
- China
- Prior art keywords
- exhaust gas
- scr catalyst
- scr
- inlet
- flow channel
- 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.)
- Pending
Links
Images
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 ; Methods of operation or control of catalytic converters
- F01N3/2053—By-passing catalytic reactors, e.g. to prevent overheating
-
- 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
-
- 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
-
- 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
- F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
- F01N2410/03—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device in case of low temperature
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1404—Exhaust gas temperature
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to a method for operating an SCR catalyst having a bypass flow channel. A method for operating an exhaust gas aftertreatment device (5) is described, the exhaust gas aftertreatment device (5) comprising an SCR catalyst (8) having an inlet (16), an outlet (17) and a bypass flow channel (40), wherein an SCR inlet valve (41) is arranged upstream of the inlet (16), an inlet to the bypass flow channel (40) is arranged upstream of the inlet (16), and the bypass flow channel (40) comprises a bypass valve (42), the method comprising the steps of: determining (51) a temperature of the exhaust gas upstream of the SCR catalyst (8); opening the bypass valve (42) and closing the SCR inlet valve (41) if the temperature exceeds an established threshold (54); closing the bypass valve (42) and opening the SCR inlet valve (41) if the temperature is below an established threshold (53).
Description
Technical Field
The present invention relates to a method for operating an exhaust gas aftertreatment device comprising an SCR catalyst. The invention also relates to an exhaust gas aftertreatment device, an engine arrangement, a vehicle, and a computer program product.
Background
After the combustion gases have left the combustion space or chamber of the internal combustion engine, exhaust aftertreatment devices use mechanical, catalytic, or chemical processes to clean the combustion gases in order to comply with legal emissions limits. In combination with increasingly stringent legal requirements for emissions from vehicles, in particular motor vehicles, extensive challenges are created for exhaust gas aftertreatment.
One key challenge is to reduce nitrogen oxide emissions (NOx emissions) that occur during operation of an internal combustion engine at high loads and/or at high engine speeds. Typically, nitrogen oxides are converted by means of a selective catalytic reduction catalyst (SCR), wherein an aqueous urea solution is injected into the exhaust gas stream upstream of the SCR catalyst. However, the performance of the SCR catalyst drops at high exhaust temperatures due to oxidative effects within the SCR system, primarily due to oxidative effects on the washcoat. In particular, the effect is that an increasing proportion of the urea supplied directly oxidizes the ammonia present, rather than promoting the reduction of nitrogen oxides. A simple solution to the described problem is in fact to arrange the SCR catalyst further away from the internal combustion engine at the prevailing lower temperature, but this also reduces the performance under cold start conditions, and the SCR catalyst reaches its operating temperature of at least 200 degrees celsius after a considerable period of time.
Document US2014/0010744a1 describes, for example, an SCR catalyst having a bypass flow passage through which exhaust gas is directed when the exhaust gas temperature is below a threshold value and the hydrocarbon content in the exhaust gas exceeds the threshold value.
Disclosure of Invention
On this background, it is an object of the present invention to provide an improved method for operating an exhaust gas aftertreatment device with an SCR catalyst, which method in particular eliminates the disadvantages described above in connection with high exhaust gas temperatures.
This object is achieved by a method for operating an exhaust gas aftertreatment device according to claim 1, an exhaust gas aftertreatment device according to claim 6, an engine arrangement according to claim 8, a motor vehicle according to claim 9 and a computer program product according to claim 10. The dependent claims contain further advantageous embodiments of the invention.
The method according to the invention for operating an exhaust gas aftertreatment device relates to an exhaust gas aftertreatment device comprising an SCR catalyst with an inlet, an outlet and a bypass flow channel. An SCR inlet valve is disposed upstream of the inlet with respect to exhaust gas flow. An inlet to the bypass flow channel is disposed upstream of the inlet. The bypass flow passage includes a bypass valve.
The method according to the invention comprises the following steps: the temperature of the exhaust gas upstream of the SCR catalyst is determined (in particular, measured). If the temperature exceeds an established threshold, the bypass valve opens and the SCR inlet valve closes. In other words, in this case, the exhaust gas stream bypasses the SCR catalyst. If the temperature is below an established threshold, the bypass valve is closed and the SCR inlet valve is opened. In this case, the exhaust gas flow is guided through the SCR catalyst. Preferably, urea is injected into the exhaust stream upstream of the SCR catalyst.
The method according to the invention has the advantage that at high exhaust temperatures, undesired oxidation of urea on the hot coating in the SCR catalyst is avoided. Furthermore, the conversion of nitrogen oxides is ensured even at high exhaust temperatures, for example because a further SCR catalyst arranged downstream of the SCR catalyst is used.
The threshold for the exhaust temperature may be between 400 degrees celsius and 600 degrees celsius, for example, between 450 degrees celsius and 550 degrees celsius.
In a further variant, a particulate filter (in particular a diesel particulate filter) and/or a further SCR catalyst is arranged downstream of the SCR catalyst, which for better understanding is referred to below as the first SCR catalyst. The exhaust gas can thus be led through the particulate filter and/or the further SCR catalyst after passing the first SCR catalyst or the bypass flow channel. If a urea injection device has been arranged upstream of the first SCR catalyst and urea has been injected into the exhaust gas stream by means of this device, no separate urea injection device is required for the further SCR catalyst. However, the second urea injection device may also be arranged upstream of the further SCR catalyst.
The further SCR catalyst may for example be arranged in an underfloor region of the motor vehicle. This arrangement has the following advantages: the further SCR catalyst can thus be positioned at a greater distance from the internal combustion engine, where lower temperatures prevail and thus the exhaust gas temperature is also lower than in the region of the first SCR catalyst. At high exhaust temperatures, nitrogen oxides may be converted by the further SCR catalyst in this embodiment.
The computer program product according to the invention contains commands which, when the program is executed by a computer, cause the latter to carry out the method according to the invention as described above. The computer program product according to the invention has the advantages already described in connection with the method according to the invention.
An exhaust aftertreatment device according to the invention comprises an SCR catalyst having an inlet, an outlet and a bypass flow channel. An SCR inlet valve is disposed upstream of the inlet. An inlet to the bypass flow passage is disposed upstream of the SCR inlet valve, and the bypass flow passage contains a bypass valve. The exhaust aftertreatment device comprises means for determining a temperature of the exhaust gas upstream of the SCR catalyst, and control means. The control device is configured to perform the method according to the invention as described above. The exhaust gas aftertreatment device according to the invention has the features and advantages already explained.
In an advantageous variant, the means for injecting urea are arranged upstream of the SCR catalyst. Additionally or alternatively, a particulate filter (in particular a diesel particulate filter) and/or a further SCR catalyst may be arranged downstream of the SCR catalyst. The advantages of this arrangement have been explained above. In yet another embodiment, the diesel particulate filter itself may have an SCR washcoat. With respect to the bypass, the injection may be continued due to the design acting as a cooler or even including a cooler. Since this arrangement can become overheated in extreme conditions, a second urea injector before the SCR catalyst arranged in the underfloor region is useful.
The engine arrangement according to the invention comprises an internal combustion engine and an exhaust gas aftertreatment device as described above. The vehicle according to the invention comprises an engine arrangement according to the invention. The engine arrangement according to the invention and the vehicle according to the invention have the advantages set forth above. The vehicle according to the invention may be a motor vehicle or a ship. In the case of a motor vehicle, this may be a motorcycle, car, truck, bus or minibus.
Drawings
The figures show:
fig. 1 schematically shows an engine arrangement according to the invention with an exhaust gas aftertreatment device according to the invention;
FIG. 2 schematically shows, in flow chart form, a method according to the invention;
fig. 3 schematically shows a motor vehicle according to the invention.
Detailed Description
The engine arrangement 1 schematically shown in fig. 1 comprises an internal combustion engine 2, an exhaust gas aftertreatment device 5 according to the invention, a high-pressure exhaust gas recirculation device 6 and/or a low-pressure exhaust gas recirculation device 7. The engine arrangement 1 furthermore contains a turbocharger 9. The turbocharger 9 includes a compressor 11 and a turbine 12.
The exhaust gas aftertreatment device 5 according to the invention comprises an SCR catalyst 8 having an inlet 16 and an outlet 17. The inlet valve 41 is arranged upstream of the inlet 16. The inlet into the SCR bypass flow channel 40 bridging the SCR catalyst is arranged upstream of the inlet valve 41. The SCR bypass flow passage 40 contains an SCR bypass valve 42. The SCR bypass flow passage 40 opens into the exhaust flow passage 18 immediately downstream of the outlet 17 of the SCR catalyst 8. A means 15 for injecting urea into the flow passage 18 is disposed upstream of the SCR bypass flow passage 40.
The exhaust aftertreatment device 5 shown in fig. 1 further comprises a pure oxidation catalyst or NOx storage catalyst 13 and a particulate filter 14 arranged downstream of the NOx storage catalyst 13. A further SCR catalyst 31 is arranged downstream of the particulate filter 14.
The internal combustion engine 2 comprises a plurality of cylinders 3 (four cylinders in the variant shown), a flywheel 4, an intake manifold 20 and an exhaust manifold 21. Further, an oil cooler 22 and a high-pressure fuel pump 23 are arranged in the internal combustion engine 2.
During operation of the internal combustion engine 2, fuel is supplied to the cylinders 3 via the fuel pump 23. Furthermore, the charge air 46 is drawn through the air filter 24 by means of the compressor 11. In the variant shown, the air filter 24 contains an air mass sensor 39. The flow path leading from the air filter 24 to the compressor 11 is marked with reference sign 25. The charge air compressed by the compressor 11 or the exhaust gas mixed with charge air in the case of exhaust gas recirculation is conducted via a flow channel 26 to a throttle 27 and from there via a charge air cooler 28 to the intake manifold 21 and the cylinders 3.
In the illustrated variant, a high-pressure exhaust gas recirculation flow passage 29 is provided, which high-pressure exhaust gas recirculation flow passage 29 branches off from the exhaust manifold 21 and opens into the intake manifold 20 just upstream of the intake manifold 20. Flow passage 29 also contains a high pressure exhaust gas recirculation valve 30.
The exhaust gas leaving the internal combustion engine 2 is led via an exhaust manifold 21 to the turbine 12, whereby the compressor 11 is driven. The exhaust gas is then directed through flow passage 18 to the exhaust aftertreatment components mentioned above. After passing through the exhaust gas aftertreatment device 5, the cleaned exhaust gas is led to an outlet. The flow direction of the exhaust gas is marked with reference sign 32.
The low-pressure exhaust gas recirculation flow passage 33 is arranged upstream of the further SCR catalyst 31. The low-pressure exhaust gas recirculation flow passage 33 includes a dirt filter 34, a cooler 35, and a valve 36. In the variant shown, the exhaust gas recirculation cooler 35 is bridged by a bypass flow channel 37 with a low-pressure exhaust gas recirculation bypass valve 38. The low-pressure exhaust gas recirculation passage 33 is also connected to the flow passage 25 via an exhaust gas recirculation combination valve 43.
The method according to the invention is described below with reference to the flow chart shown in fig. 2. In a first step 51, the exhaust gas temperature upstream of the SCR catalyst 8 is determined, for example detected by means of a temperature sensor. In step 52, it is checked whether the exhaust temperature determined in step 51 exceeds an established threshold (e.g., 500 degrees Celsius). If this is not the case, in step 53 the SCR inlet valve 41 is opened and the SCR bypass valve 42 is closed. The exhaust gases are thus led through the SCR catalyst 8. If the exhaust temperature is above the threshold temperature in step 52, the SCR inlet valve 41 is closed and the SCR bypass valve 42 is opened in step 54. The exhaust gas thus bypasses the SCR catalyst 8.
Fig. 3 schematically shows a motor vehicle 10 according to the invention. A motor vehicle 10 according to the invention comprises an engine arrangement 1 according to the invention, such as the engine arrangement 1 described with reference to fig. 1. The engine arrangement 1 comprises an exhaust gas aftertreatment device 5 according to the invention, said exhaust gas aftertreatment device 5 having a control device 60 configured to perform the method according to the invention. The engine arrangement 1 according to the invention is thus configured to carry out the method according to the invention, for example in connection with the method according to the invention explained in fig. 2.
REFERENCE SIGNS LIST
1 Engine arrangement
2 internal combustion engine
3 cylinder
4 flywheel
5 exhaust gas aftertreatment device
6 high-pressure exhaust gas recirculation device
7 low-pressure exhaust gas recirculation device
9 turbo charger
8 SCR catalyst
10 Motor vehicle
11 compressor
12 turbine
13 NOx storage catalyst
14 particulate filter
15 urea injection device
16 inlet
17 outlet port
18 flow channel
19 fuel injector
20 air intake manifold
21 exhaust manifold
22 oil cooler
23 high-pressure fuel pump
24 air filter
25 flow channel
26 flow channel
27 throttle valve
28 charge air cooler
29 high pressure exhaust gas recirculation flow passage
30 high pressure exhaust gas recirculation valve
31 SCR catalyst
32 direction of flow
33 low pressure exhaust gas recirculation flow passage
34 dirt filter
35 cooler
36 valve
37 bypass flow channel
38 low pressure exhaust gas recirculation bypass valve
39 air quality sensor
40 SCR bypass flow channel
41 SCR inlet valve
42 SCR bypass valve
43 exhaust gas recirculation combination valve
44 flow direction of recirculated exhaust gas
45 direction of flow of the mixture of fresh air and recirculated exhaust gas
46 direction of flow
51 exhaust temperature detection
52 exhaust temperature exceeds an established threshold?
53 SCR bypass valve closed, SCR inlet valve open
54 SCR bypass valve open, SCR inlet valve closed
60 control device
J is
N is no
Claims (10)
1. Method for operating an exhaust gas aftertreatment device (5), the exhaust gas aftertreatment device (5) comprising an SCR catalyst (8) having an inlet (16), an outlet (17) and a bypass flow channel (40), wherein an SCR inlet valve (41) is arranged upstream of the inlet (16), an inlet to the bypass flow channel (40) is arranged upstream of the inlet (16), and the bypass flow channel (40) comprises a bypass valve (42),
it is characterized in that
The method comprises the following steps:
-determining (51) a temperature of the exhaust gas upstream of the SCR catalyst (8),
-opening the bypass valve (42) and closing the SCR inlet valve (41) if the temperature exceeds an established threshold value (54),
-closing the bypass valve (42) and opening the SCR inlet valve (41) if the temperature is below an established threshold value (53).
2. The method of claim 1, wherein the first and second light sources are selected from the group consisting of,
it is characterized in that
The threshold is between 400 degrees celsius and 600 degrees celsius.
3. The method of claim 2, wherein the first and second light sources are selected from the group consisting of,
it is characterized in that
The threshold is between 450 degrees celsius and 550 degrees celsius.
4. The method of any one of claims 1 to 3,
it is characterized in that
A particulate filter (14) and/or a further SCR catalyst (31) is arranged downstream of the SCR catalyst (8), and exhaust gas is led through the particulate filter (14) and/or the further SCR catalyst (31) after passing the SCR catalyst (8) or the bypass flow channel (40).
5. The method of any one of claims 1 to 4,
it is characterized in that
Urea is injected into the exhaust gas stream upstream of the SCR catalyst (8).
6. An exhaust gas aftertreatment device (5), the exhaust gas aftertreatment device (5) comprising an SCR catalyst (8) having an inlet (16), an outlet (17) and a bypass flow channel (40), wherein an SCR inlet valve (41) is arranged upstream of the inlet (16), an inlet to the bypass flow channel (40) is arranged upstream of the SCR inlet valve (41), and the bypass flow channel (40) comprises a bypass valve (42),
it is characterized in that
The exhaust gas aftertreatment device (5) comprises means for determining the temperature of the exhaust gas upstream of the SCR catalyst (8), and a control device (60), wherein the control device (60) is configured to carry out the method according to any one of claims 1 to 5.
7. The exhaust gas aftertreatment device (5) of claim 6,
it is characterized in that
A device (15) for injecting urea is arranged upstream of the SCR catalyst (8), and/or a particulate filter (14) and/or a further SCR catalyst (31) is arranged downstream of the SCR catalyst (8).
8. An engine arrangement (1), the engine arrangement (1) comprising an internal combustion engine (2) and an exhaust gas aftertreatment device (5) according to any one of claims 6 to 7.
9. Vehicle (10), the vehicle (10) comprising an engine arrangement (1) according to claim 8.
10. Computer program product comprising instructions which, when said program is executed by a computer, cause the latter to carry out the method according to any one of claims 1 to 5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019202943.4 | 2019-03-05 | ||
| DE102019202943.4A DE102019202943A1 (en) | 2019-03-05 | 2019-03-05 | Method for operating an SCR catalytic converter with a bypass flow channel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111663983A true CN111663983A (en) | 2020-09-15 |
Family
ID=72146501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010145541.9A Pending CN111663983A (en) | 2019-03-05 | 2020-03-05 | Method for operating an SCR catalyst having a bypass flow channel |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111663983A (en) |
| DE (1) | DE102019202943A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114233440A (en) * | 2021-12-17 | 2022-03-25 | 潍柴动力股份有限公司 | Urea double-injection aftertreatment system, control method thereof and vehicle |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140010744A1 (en) * | 2012-07-05 | 2014-01-09 | Ford Global Technologies, Llc | System and method for improving operation of an scr |
| DE102017205170B4 (en) * | 2017-03-28 | 2022-09-29 | Bayerische Motoren Werke Aktiengesellschaft | Exhaust system for an internal combustion engine and method for operating an exhaust system |
-
2019
- 2019-03-05 DE DE102019202943.4A patent/DE102019202943A1/en not_active Ceased
-
2020
- 2020-03-05 CN CN202010145541.9A patent/CN111663983A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114233440A (en) * | 2021-12-17 | 2022-03-25 | 潍柴动力股份有限公司 | Urea double-injection aftertreatment system, control method thereof and vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102019202943A1 (en) | 2020-09-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106121873B (en) | Engine with low pressure EGR system and control method thereof | |
| CN111255547B (en) | Exhaust gas aftertreatment system and method for exhaust gas aftertreatment of an internal combustion engine | |
| CN106437973B (en) | Method for exhaust gas aftertreatment of an internal combustion engine and device for carrying out the method | |
| US8156733B2 (en) | Method of operating an internal combustion engine to heat up a selective catalyst reducer | |
| GB2558562B (en) | Aftertreatment temperature control apparatus and method | |
| US9695729B2 (en) | Reduced emissions internal combustion engine systems | |
| EP3559431B1 (en) | A method for controlling an internal combustion engine | |
| US11008982B2 (en) | Exhaust-gas turbocharger | |
| CN106194359B (en) | Method and system for controlling exhaust flow in an engine system | |
| US8175788B2 (en) | Control unit of diesel engine | |
| US10774724B2 (en) | Dual stage internal combustion engine aftertreatment system using exhaust gas intercooling and charger driven air ejector | |
| RU2569397C2 (en) | Operation of supercharged gas engine (versions) and gas engine | |
| RU150894U1 (en) | ENGINE SYSTEM | |
| US20140007851A1 (en) | Method of controlling an after-treatment system warm-up | |
| EP1664497B1 (en) | Piston-type internal combustion engine | |
| US20180258870A1 (en) | Method of operating an internal combustion engine having a turbocharger | |
| CN111663984A (en) | Method for regenerating a NOx storage catalytic converter of an exhaust gas aftertreatment device | |
| US20110120123A1 (en) | Low pressure turbine waste gate for diesel engine having two stage turbocharger | |
| CN105604681A (en) | Engine system for controlling exhaust gas flow | |
| CN111663983A (en) | Method for operating an SCR catalyst having a bypass flow channel | |
| CN111287869B (en) | Internal combustion engine and method for exhaust gas aftertreatment of an internal combustion engine | |
| WO2010123411A1 (en) | Method and arrangement for recirculation of exhaust gases of a combustion engine | |
| KR101071873B1 (en) | Recirculating exhaust gas system using vortex tube | |
| JP2012167562A (en) | Diesel engine | |
| JP5915856B2 (en) | Exhaust gas purification device for internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |