WO2001065097A1 - VERFAHREN UND VORRICHTUNG ZUR DURCHFÜHRUNG EINER NOx-REGENERATION EINES IN EINEM ABGASKANAL EINER VERBRENNUNGSKRAFTMASCHINE ANGEORDNETEN NOx-SPEICHERKATALYSATORS - Google Patents
VERFAHREN UND VORRICHTUNG ZUR DURCHFÜHRUNG EINER NOx-REGENERATION EINES IN EINEM ABGASKANAL EINER VERBRENNUNGSKRAFTMASCHINE ANGEORDNETEN NOx-SPEICHERKATALYSATORS Download PDFInfo
- Publication number
- WO2001065097A1 WO2001065097A1 PCT/EP2001/001788 EP0101788W WO0165097A1 WO 2001065097 A1 WO2001065097 A1 WO 2001065097A1 EP 0101788 W EP0101788 W EP 0101788W WO 0165097 A1 WO0165097 A1 WO 0165097A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- exhaust gas
- regeneration
- internal combustion
- combustion engine
- gas recirculation
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
- F02D41/0055—Special engine operating conditions, e.g. for regeneration of exhaust gas treatment 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
- F01N3/08—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
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
-
- 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
Definitions
- the invention relates to a method and a device for carrying out a NO x regeneration of a NO x storage catalytic converter arranged in an exhaust gas duct of an internal combustion engine with the features mentioned in the preamble of claims 1 and 8
- catalytic converters with NO x storage function (NO x storage catalytic converters) in exhaust gas lines of internal combustion engines.
- the catalytic converter thereby reduces an emission of pollutants by providing a Conversion of exhaust gas components, such as carbon monoxide, unburned hydrocarbons and nitrogen oxides, into less environmentally relevant compounds requires that internal combustion engines are operated as permanently as possible in a lean operating mode with ⁇ > 1, i.e. with an excess of oxygen in a supplied air-fuel mixture under these conditions, fuel consumption is reduced.
- the NO x regeneration is carried out during at least part of its regeneration duration at an exhaust gas recirculation rate of 0 to 15 vol%, in particular at 0 to 10 vol%.
- Current customary recirculation rates vary depending on the engine type Range of 25 to 35 vol.%
- the volume fraction relates to a proportion of the recirculated exhaust gas volume in an overall air volume to be supplied to the internal combustion engine.
- the exhaust gas recirculation rate can be varied stepwise or continuously during the regeneration
- the NO x regeneration is carried out over at least 50% of its regeneration duration with the reduced exhaust gas recirculation rate or without exhaust gas recirculation. It is furthermore advantageous to reduce or block the exhaust gas recirculation during an initial phase of the NO x regeneration.
- means are provided with which the method steps of switching off and / or throttling an exhaust gas recirculation can be carried out during at least part of a regeneration period
- these means comprise a control unit in which a procedure for controlling the method steps for carrying out NO x regeneration and the NO x storage catalytic converter is stored in digital form, the control unit being able to be integrated in an engine control unit
- Figure 1 is a schematic arrangement of an internal combustion engine with an exhaust duct
- Figure 2 shows a time course of lambda during a NO x regeneration with and without exhaust gas recirculation
- FIG. 1 shows a schematic illustration of an internal combustion engine 10 with an exhaust gas channel 12 assigned to it. Downstream of the internal combustion engine 10, a small-volume pre-catalytic converter 14 and a NO x storage catalytic converter 16 are arranged in the exhaust gas channel 12. A lambda probe 18 is used to detect an oxygen concentration in the exhaust gas and is still located in front of the catalytic converter system 14, 16 in the exhaust gas duct 12. The lambda probe 18 outputs a signal to an engine control unit 20, which processes this and other measurement signals and operating parameters of the internal combustion engine 10. Integrated in the engine control unit 20 is a control unit 22, in which the procedure according to the invention for carrying out a NO x regeneration of the NO x storage catalytic converter 16 is stored in digital form.
- the engine control unit 20 or the control unit 22 controls the operating mode of the internal combustion engine 10 by being For example, an intake fresh air volume flow is regulated by setting a throttle valve 24 in an intake pipe 26. Furthermore, the engine control unit 20 or the control unit 22 controls an exhaust gas recirculation valve 30 arranged in a return line 28
- the control unit 22 switches the internal combustion engine 10 into a homogeneous, stoichiometric or rich operating mode.
- the control unit 22 specifies, for example, a stronger closed position of the throttle valve 24 , so that the proportion of oxygen in the supplied air-fuel mixture is reduced.
- the exhaust gas recirculation is reduced and / or completely prevented during at least part of the regeneration period. This is also done by a corresponding control of the exhaust gas recirculation valve 30 by the engine control unit 20 or the control unit 22 FIG.
- FIG. 2 shows a simplified representation of a time course of a lambda value measured in front of the catalytic converter system 14, 16 with the lambda probe 18 during a NO x regeneration of the NO x storage catalytic converter 16.
- the broken line 32 represents a lambda course during regeneration with activation of an exhaust gas recirculation according to current customary practice (recirculation rate about 30% by volume), while the solid line 34 shows a corresponding lambda curve without exhaust gas recirculation.
- both curves 32, 34 have a constant level corresponding to a lambda lean specification ⁇ m after detection of a need for regeneration and switching of an air-fuel mixture supplied to the internal combustion engine 10 to a rich, that is to say fuel-rich composition, at a point in time tg, the signal 32 measured with simultaneous exhaust gas recirculation still persists for a certain delay lean lambda value ⁇ m This can be attributed to the oxygen-rich exhaust gas, which from the previous lean phase is still in the exhaust gas recirculation line 28 and is supplied to the fresh air drawn in.
- the signal 32 drops relatively flat until a time t-
- the flatness of the previous drop in the lambda value is also a result of the exhaust gas being fed into the fresh air drawn in.
- the lambda fat specification ⁇ f is maintained and stored nitrogen oxides NO x of the NO x storage catalytic converter 16 reduced with the reducing agents CO and HC present in the exhaust gas.
- the internal combustion engine 10 is switched back to the lean mode so that the lambda value reappears for the lambda lean specification ⁇ m
- the lambda curve 34 (solid line) measured according to the invention without exhaust gas recirculation shows considerable deviations from the curve 32 explained above, measured with the exhaust gas recirculation switched on falling course, so that the lambda fat specification ⁇ f already at a time t-
- the very long regeneration period with simultaneous exhaust gas recirculation (curve 32) is a result of the constant exhaust gas extraction, so that only a reduced reducing agent mass flow is available to convert the nitrogen oxides of the NO x storage catalytic converter
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01905789A EP1264095A1 (de) | 2000-03-02 | 2001-02-16 | Verfahren und vorrichtung zur durchführung einer nox-regeneration eines in einem abgaskanal einer verbrennungskraftmaschine angeordneten nox-speichers |
AU2001233776A AU2001233776A1 (en) | 2000-03-02 | 2001-02-16 | Method and device for carrying out an nox regeneration of an nox storage-type catalytic converter mounted in an exhaust gas channel of an internal combustion engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10010033.3 | 2000-03-02 | ||
DE10010033A DE10010033A1 (de) | 2000-03-02 | 2000-03-02 | Verfahren und Vorrichtung zur Durchführung einer NOx-Regeneration eines in einem Abgaskanal einer Verbrennungskraftmaschine angeordneten NO¶x¶-Speicherkatalysators |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001065097A1 true WO2001065097A1 (de) | 2001-09-07 |
Family
ID=7633149
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/001788 WO2001065097A1 (de) | 2000-03-02 | 2001-02-16 | VERFAHREN UND VORRICHTUNG ZUR DURCHFÜHRUNG EINER NOx-REGENERATION EINES IN EINEM ABGASKANAL EINER VERBRENNUNGSKRAFTMASCHINE ANGEORDNETEN NOx-SPEICHERKATALYSATORS |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1264095A1 (de) |
AU (1) | AU2001233776A1 (de) |
DE (1) | DE10010033A1 (de) |
WO (1) | WO2001065097A1 (de) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0752521A1 (de) * | 1995-01-20 | 1997-01-08 | Toyota Jidosha Kabushiki Kaisha | Abgasreinigungsverfahren für eine brennkraftmaschine |
-
2000
- 2000-03-02 DE DE10010033A patent/DE10010033A1/de not_active Withdrawn
-
2001
- 2001-02-16 AU AU2001233776A patent/AU2001233776A1/en not_active Abandoned
- 2001-02-16 WO PCT/EP2001/001788 patent/WO2001065097A1/de not_active Application Discontinuation
- 2001-02-16 EP EP01905789A patent/EP1264095A1/de not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0752521A1 (de) * | 1995-01-20 | 1997-01-08 | Toyota Jidosha Kabushiki Kaisha | Abgasreinigungsverfahren für eine brennkraftmaschine |
Non-Patent Citations (1)
Title |
---|
"ENTWICKLUNG EINES REGEL- UND ABGASNACHBEHANDLUNGSSYSTEMS FUER EINEN GDI-MOTOR", MTZ MOTORTECHNISCHE ZEITSCHRIFT,FRANCKH'SCHE VERLAGSHANDLUNG,ABTEILUNG TECHNIK. STUTTGART,DE, vol. 60, no. 12, December 1999 (1999-12-01), pages 800 - 807, XP000862676, ISSN: 0024-8525 * |
Also Published As
Publication number | Publication date |
---|---|
AU2001233776A1 (en) | 2001-09-12 |
EP1264095A1 (de) | 2002-12-11 |
DE10010033A1 (de) | 2001-09-27 |
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