EP1058578B1 - REGENERATION EINES NOx-SPEICHERKATALYSATORS EINES VERBRENNUNGSMOTORS - Google Patents
REGENERATION EINES NOx-SPEICHERKATALYSATORS EINES VERBRENNUNGSMOTORS Download PDFInfo
- Publication number
- EP1058578B1 EP1058578B1 EP98965807A EP98965807A EP1058578B1 EP 1058578 B1 EP1058578 B1 EP 1058578B1 EP 98965807 A EP98965807 A EP 98965807A EP 98965807 A EP98965807 A EP 98965807A EP 1058578 B1 EP1058578 B1 EP 1058578B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinders
- exhaust gas
- regeneration
- internal combustion
- engine
- 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.)
- Expired - Lifetime
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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
- F02D41/008—Controlling each cylinder individually
- F02D41/0082—Controlling each cylinder individually per groups or banks
-
- 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
-
- 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
- F02D41/028—Desulfurisation of NOx traps or adsorbent
Definitions
- the invention relates to the regeneration of a NOx storage catalyst Internal combustion engine, for example a lean mix engine, a DI engine or a diesel engine, according to the preamble of claims 1 and 6.
- EP 0 540 280 describes exhaust gas treatment using a Exhaust gas treatment system, which is a means of storing and releasing the NOx contains, the nitrogen oxides are temporarily stored in the lean operation of the engine and thermally released again by heating the introduced exhaust gas become. The catalyst is then released by means of a NOx-decomposing catalyst Nitrogen oxides decomposed again under oxidizing conditions.
- the NOx-decomposing catalyst from a 3-way catalyst and / or a zeolite catalyst exist, which is operated at ⁇ less than or equal to one.
- EP 0 562 805 describes an exhaust gas aftertreatment of an internal combustion engine in which the exhaust system two alternately flowed, arranged parallel to each other Lean NOx catalysts. Furthermore, the known device comprises a Device for changing the space velocity of the exhaust gas to an optimal To be able to adjust the space velocity of the exhaust gas.
- the Exhaust system is a means of injecting HC directly into the exhaust duct.
- Long-term suitability is questionable, since zeolite catalysts are not thermal are stable, especially not tolerate a rich or stoichiometric exhaust gas. Also the durability of the facility for changing the Exhaust gas circuit space velocity problematic.
- EP 0 580 389 discloses a method for exhaust gas aftertreatment of lean-burn engines, which is equipped with a NOx absorber based on alkali, alkaline earth or rare earth metals, a 3-way catalytic converter arranged downstream, and with sensors for detecting the load and the Exhaust gas temperature are equipped. The information from the sensors limits the area within which the NOx absorber is able to store nitrogen oxides. Regeneration of the catalyst is accomplished by greasing for a predetermined period.
- a disadvantage of this known device is the separation between the absorber and the 3-way catalytic converter, since the predominantly engine-generated nitrogen oxides must first be oxidized to NO 2 in order to be stored in the absorber.
- EP 0 560 991 describes a system for treating an exhaust gas Internal combustion engine, in which the absorber and the catalyst in one housing are included.
- the nitrogen oxides are stored when the engine is operated lean will, d. H. the exhaust gas is lean and released when the oxygen concentration in the Exhaust gas is reduced to rich or stoichiometric ⁇ values, so that the released NOx reduced with the unburned hydrocarbons and the CO of the exhaust gas becomes.
- the switch from lean to fat or stoichiometric operation accompanied by torque jumps which the driver of the Vehicle only feels desirable if it is during a Acceleration phase occur. These torque jumps occur during one Constant operating phase, so they are perceived as extremely undesirable. Since in Normally, the NOx storage is emptied during constant operating phases is attempted, this torque jumps by shifting to reduce the ignition timing simultaneously with the enrichment.
- the currently known NOx storage catalytic converters are deactivated by sulfur-containing fuel.
- the NOx-absorbing material of the NOx storage catalyst in particular BaO or BaCO 3, forms thermally stable sulfates with the SO 2 present in the exhaust gas, which oxidizes to SO 3 on the platinum present in the catalyst, which can be decomposed at a temperature. which is above the temperature at which the nitrates formed from the storage material and the NO 2 are decomposed.
- a sulfate regeneration program is therefore carried out from time to time, with a temperature increase to approx. 600-700 ° C.
- EP-A-0 625 633 shows a method and a device for cleaning the exhaust gas of a lean-burn internal combustion engine according to the preamble of claims 1 and 6.
- the invention has for its object a method and an apparatus for Exhaust gas treatment of an internal combustion engine to create a reduction in the NOx content of the exhaust gas and possibly the sulfate content of the NOx storage without the occurrence of a torque jump or an increased power output causes.
- the invention is used in the detoxification of exhaust gases from an internal combustion engine, the detoxification being in particular a reduction of the nitrogen oxides.
- the invention can also be used for the intermediate storage of SOx, as can be the case depending on the sulfur content of the fuel in exhaust gas cleaning devices of lean-burn internal combustion engines.
- NOx is usually stored by storing NO 2 (for example as nitrate), alkaline earth oxides and / or carbonates (for example BaO) being particularly suitable.
- Such substances are also able to store SOx, in particular in the form of SO 3 as sulfates.
- a SOx storage can be placed in front of a NOx storage if desired, which means that the SOx storage has higher temperatures than the NOx storage and the NOx storage is not poisoned by SOx.
- SOx and NOx are released again, the NOx being converted catalytically with the HC and / or CO present.
- the SOx is released either as such or after reaction with CO and / or HC in a wide variety of compounds, the SOx not being stored in the subsequent NOx storage under the present regeneration conditions.
- NOx storage is used if nothing else is noted, these statements apply equally to a SOx memory or a combination of these memories.
- the ⁇ value is preferably ⁇ 1.01 during the release phase of the NOx. You can choose between lean and slightly above the stoichiometric exhaust gas value lying machine operation can be switched back and forth, the times of the Switching depends on the duration of the lean operation.
- the cylinder-specific enrichment takes place advantageously at half or a number of cylinders close to half.
- the selective cylinder-specific ⁇ detuning can be done with a control unit be made.
- This is effected by motor by generating almost stoichiometric exhaust the engine is selectively enriched with part of the cylinders and the other part of the cylinders continues to run lean.
- the production of nitrous oxide lies with that The inventive method not over that of known 3-way catalysts.
- the device according to the invention brings about the corresponding selective cylinder-specific ⁇ detuning a desulfation of the NOx storage.
- the following table shows measured values of the gross nitrogen oxide conversion ⁇ NOx of an engine with lean and regeneration operation in a continuous sequence of lean operation and subsequent regeneration operation once with a rich ⁇ value of 0.85 and once with a slightly above the stoichiometric value ⁇ value of 1.01. It can be seen from the table that even in the regeneration process according to the invention, which operates somewhat above the stoichiometric ⁇ value, a gross conversion is achieved which is even somewhat higher than that of the richer exhaust gas of the known processes. ⁇ NOx [%] Regeneration ⁇ 87 0.85 88 1.01
- FIG schematically represents the arrangement of the exhaust system on an internal combustion engine.
- reference numeral 1 denotes a machine with more than one Cylinders, such as a lean-mix gasoline engine, a di-gasoline engine or a Diesel engine, shown, which is arranged below an exhaust gas cleaning system 2, which has a NOx storage catalytic converter 3.
- a gross ⁇ value i.e. H. on averaged ⁇ value of all cylinders, slightly above the stoichiometric value of the Exhaust gas set for regeneration of the NOx storage 3 and thus regeneration and desulfation of the NOx storage causes.
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)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
ηNOx[%] | Regenerations-λ |
87 | 0,85 |
88 | 1,01 |
Claims (8)
- Verfahren zur NOx- und gegebenenfalls zur SOx-Regeneration eines NOx-Speicherkatalysators, der in einer Abgasreinigungsanlage einer Brennkraftmaschine mit mehr als einem Zylinder angeordnet ist, wobei zur Regeneration des NOx-Speicherkatatysators ein Massenstrom an Reduktionsmitteln im Abgas erhöht wird, dadurch gekennzeichnet, daß mittels einer Steuereinheit ein Teil der Zylinder unter mageren Bedingungen λ > 1 und ein anderer Teil der Zylinder unter fetten Bedingungen λ < 1 betrieben wird, jedoch im Mittel über alle Zylinder λ ≥ 1 wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß ein Teil der Zylinder während der Regeneration bei λ ≤ 0,95, insbesondere λ ≤ 0,85 betrieben wird.
- Verfahren nach Anspruch 1 oder 2 dadurch gekennzeichnet, daß die zylinderselektive Vertrimmung während einer konstanten Betriebsphase ohne Lastwechsel erfolgt.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß eine Hälfte oder eine der Hälfte nahekommende Anzahl von Zylindem angefettet wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnete daß die Steuerungseinheit die zylinderselektive Vertrimmung im Leerlauf, im Schubbetrieb und/oder bei einer Motorlast von ≤ 25 % einer maximalen Motomennlast vornimmt
- Vorrichtung zur NOx- und gegebenenfalls zur SOx-Regeneration eines NOx-Speicherkatalysators, der in einer Abgasreinigungsanlage einer Brennkraftmaschine mit mehr als einem Zylinder angeordnet ist und der zur Regeneration mit einem erhöhten Massenstrom an Reduktionsmitteln im Abgas beaufschlagt wird, dadurch gekennzeichnet, daß die Vorrichtung eine Steuereinheit umfaßt, mittels derer während der Regeneration ein Teil der Zylinder unter mageren Bedingungen λ > 1 und ein anderer Teil der Zylinder unter fetten Bedingungen λ < 1 betrieben wird, jedoch im Mittel über alle Zylinder λ ≥ 1 wird.
- Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Brennkraftmaschine ein Ottomotor ist.
- Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Brennkraftmaschine ein Direkteinspritzer ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19758018A DE19758018A1 (de) | 1997-12-29 | 1997-12-29 | Regeneration eines NOx-Speicherkatalysators eines Verbrennungsmotors |
DE19758018 | 1997-12-29 | ||
PCT/EP1998/008061 WO1999033548A1 (de) | 1997-12-29 | 1998-12-10 | REGENERATION EINES NOx-SPEICHERKATALYSATORS EINES VERBRENNUNGSMOTORS |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1058578A1 EP1058578A1 (de) | 2000-12-13 |
EP1058578B1 true EP1058578B1 (de) | 2003-05-14 |
Family
ID=7853466
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98965807A Expired - Lifetime EP1058578B1 (de) | 1997-12-29 | 1998-12-10 | REGENERATION EINES NOx-SPEICHERKATALYSATORS EINES VERBRENNUNGSMOTORS |
Country Status (6)
Country | Link |
---|---|
US (1) | US6823657B1 (de) |
EP (1) | EP1058578B1 (de) |
JP (1) | JP4299457B2 (de) |
CN (1) | CN1262336C (de) |
DE (2) | DE19758018A1 (de) |
WO (1) | WO1999033548A1 (de) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6314939B1 (en) | 1999-03-11 | 2001-11-13 | Outboard Marine Corporation | Methods and apparatus for controlling engine operation |
DE19929293A1 (de) * | 1999-06-25 | 2000-12-28 | Volkswagen Ag | Verfahren zur Steuerung einer Regeneration eines NOx-Speicherkatalysators |
US6928808B2 (en) | 2000-02-17 | 2005-08-16 | Volkswagen Atkiengesellschaft | Device and method for controlling the nox regeneration of a nox storage catalyst |
DE10007049A1 (de) * | 2000-02-17 | 2001-08-23 | Volkswagen Ag | Vorrichtung und Verfahren zur Steuerung einer NO¶x¶-Regeneration eines NO¶x¶-Speicherkatalysators |
US6519933B2 (en) * | 2000-03-21 | 2003-02-18 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine having variable valve control system and NOx catalyst |
DE10018062B4 (de) * | 2000-04-12 | 2014-04-03 | Volkswagen Ag | Mehrzylindermotor für Kraftfahrzeuge mit einer mehrflutigen Abgasreinigungsanlage und Verfahren zur Steuerung eines Betriebs des Mehrzylindermotors |
DE10044411A1 (de) * | 2000-09-08 | 2002-03-21 | Bayerische Motoren Werke Ag | Verfahren zur Steuerung eines Verbrennungsmotors bei einem Regenerationszyklus |
US6360713B1 (en) * | 2000-12-05 | 2002-03-26 | Ford Global Technologies, Inc. | Mode transition control scheme for internal combustion engines using unequal fueling |
JP2004068700A (ja) * | 2002-08-06 | 2004-03-04 | Toyota Motor Corp | 排気ガス浄化方法 |
DE10238771B4 (de) * | 2002-08-23 | 2009-01-22 | Umicore Ag & Co. Kg | Verfahren zur Desulfatisierung eines Stickoxid-Speicherkatalysators |
FR2862703B1 (fr) * | 2003-11-25 | 2006-02-24 | Peugeot Citroen Automobiles Sa | Systeme de desulfatation d'un piege a nox, pour moteur de vehicule automobile |
CN100451314C (zh) * | 2004-06-24 | 2009-01-14 | 丰田自动车株式会社 | 排气排放控制系统的净化能力恢复方法 |
US7063642B1 (en) * | 2005-10-07 | 2006-06-20 | Eaton Corporation | Narrow speed range diesel-powered engine system w/ aftertreatment devices |
FR2893986B1 (fr) * | 2005-11-30 | 2008-01-04 | Inst Francais Du Petrole | Procede de controle de l'admission d'un moteur a combustion interne, notamment de type essence ou diesel, et moteurs utilisant un tel procede. |
JP2010112290A (ja) * | 2008-11-07 | 2010-05-20 | Toyota Motor Corp | 内燃機関の排気浄化装置 |
DE102011111412A1 (de) | 2011-08-23 | 2013-02-28 | Volkswagen Aktiengesellschaft | Verfahren zum Betreiben einer Brennkraftmaschine |
US10920645B2 (en) | 2018-08-02 | 2021-02-16 | Ford Global Technologies, Llc | Systems and methods for on-board monitoring of a passive NOx adsorption catalyst |
CN112706349B (zh) * | 2021-03-26 | 2021-06-04 | 成都东日瑞姆机械有限公司 | 基于双环戊二烯的反应注射成型系统 |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69221287T3 (de) | 1991-10-03 | 2005-02-24 | Toyota Jidosha K.K., Toyota | Gerät zum reinigen von verbrennungsmotor-abgasen |
JP2783074B2 (ja) | 1991-10-29 | 1998-08-06 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
US5365734A (en) | 1992-03-25 | 1994-11-22 | Toyota Jidosha Kabushiki Kaisha | NOx purification apparatus for an internal combustion engine |
JP2605586B2 (ja) | 1992-07-24 | 1997-04-30 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
EP0625633B1 (de) * | 1992-12-03 | 2000-03-15 | Toyota Jidosha Kabushiki Kaisha | Abgasreinigungsgeraet fuer brennkraftmaschinen |
US5657625A (en) * | 1994-06-17 | 1997-08-19 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Apparatus and method for internal combustion engine control |
WO1997019261A1 (fr) * | 1995-11-17 | 1997-05-29 | Toyota Jidosha Kabushiki Kaisha | Dispositif de reglage des emissions d'echappement pour moteurs a combustion interne |
DE19543219C1 (de) * | 1995-11-20 | 1996-12-05 | Daimler Benz Ag | Verfahren zum Betreiben eines Dieselmotors |
DE19600558C2 (de) * | 1996-01-09 | 1998-10-22 | Daimler Benz Ag | Verfahren zur Verringerung von Stickoxiden in Abgasen von Dieselmotoren |
JP3713831B2 (ja) * | 1996-04-19 | 2005-11-09 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
JP3454334B2 (ja) * | 1996-06-18 | 2003-10-06 | トヨタ自動車株式会社 | 排気浄化方法及びその装置 |
US5758493A (en) * | 1996-12-13 | 1998-06-02 | Ford Global Technologies, Inc. | Method and apparatus for desulfating a NOx trap |
JP3264226B2 (ja) * | 1997-08-25 | 2002-03-11 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
US6138453A (en) * | 1997-09-19 | 2000-10-31 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification device for an internal combustion engine |
US6269791B1 (en) * | 1998-07-22 | 2001-08-07 | Toyota Jidosha Kabushiki Kaisha | Control system for an internal combustion engine |
US6244047B1 (en) * | 1998-10-02 | 2001-06-12 | Ford Global Technologies, Inc. | Method of purging lean NOx trap |
-
1997
- 1997-12-29 DE DE19758018A patent/DE19758018A1/de not_active Withdrawn
-
1998
- 1998-12-10 EP EP98965807A patent/EP1058578B1/de not_active Expired - Lifetime
- 1998-12-10 DE DE59808396T patent/DE59808396D1/de not_active Expired - Lifetime
- 1998-12-10 JP JP2000526286A patent/JP4299457B2/ja not_active Expired - Fee Related
- 1998-12-10 CN CNB988127342A patent/CN1262336C/zh not_active Expired - Fee Related
- 1998-12-10 US US09/582,681 patent/US6823657B1/en not_active Expired - Fee Related
- 1998-12-10 WO PCT/EP1998/008061 patent/WO1999033548A1/de active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
US6823657B1 (en) | 2004-11-30 |
CN1283133A (zh) | 2001-02-07 |
CN1262336C (zh) | 2006-07-05 |
DE19758018A1 (de) | 1999-07-01 |
WO1999033548A1 (de) | 1999-07-08 |
JP4299457B2 (ja) | 2009-07-22 |
JP2001527188A (ja) | 2001-12-25 |
EP1058578A1 (de) | 2000-12-13 |
DE59808396D1 (de) | 2003-06-18 |
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