EP1200715B1 - Procede de reglage de la regeneration d'un catalyseur a accumulation place dans un canal de gaz d'echappement d'un moteur a combustion interne - Google Patents

Procede de reglage de la regeneration d'un catalyseur a accumulation place dans un canal de gaz d'echappement d'un moteur a combustion interne Download PDF

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Publication number
EP1200715B1
EP1200715B1 EP00943972A EP00943972A EP1200715B1 EP 1200715 B1 EP1200715 B1 EP 1200715B1 EP 00943972 A EP00943972 A EP 00943972A EP 00943972 A EP00943972 A EP 00943972A EP 1200715 B1 EP1200715 B1 EP 1200715B1
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EP
European Patent Office
Prior art keywords
combustion engine
regeneration
internal combustion
engine
speed
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
Application number
EP00943972A
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German (de)
English (en)
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EP1200715A1 (fr
Inventor
Ekkehard Pott
Rolf Bosse
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Volkswagen AG
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Volkswagen AG
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Publication date
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Publication of EP1200715A1 publication Critical patent/EP1200715A1/fr
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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
    • 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

Definitions

  • the invention relates to a method for regulating a regeneration in one Exhaust gas duct of an internal combustion engine arranged storage catalyst the features mentioned in the preamble of claim 1.
  • oxidizing agents such as NO x
  • NO x oxidizing agents
  • storage catalysts are used to avoid NO x emissions. These absorb NO x as nitrate until a NO x storage capacity is exhausted or a NO x desorption temperature is exceeded.
  • the regeneration is also carried out when the storage catalytic converter is desulfurized.
  • SO x is formed during the combustion process and is absorbed as sulfate in the storage catalytic converter.
  • a desulfurization temperature is increased due to a higher thermodynamic stability of the sulfate compared to the nitrate, and the storage catalyst must accordingly be heated up before or during the regeneration.
  • Whether there is a need for regeneration of the storage catalytic converter can be determined, for example, by evaluating the measured or calculated NO x emission downstream of the storage catalytic converter. In the same way, the regeneration operation can be regulated as a result of exceeding a predeterminable catalyst temperature.
  • Such methods are known.
  • the disadvantage here is that the regeneration mode is set only on the basis of parameters describing a catalytic converter state, but the regeneration mode can be unfavorable with regard to the operating parameters of the internal combustion engine. If, for example, the internal combustion engine, in particular the diesel internal combustion engine, has a very high speed, there is considerable white smoke formation after a change to the regeneration mode. On the other hand, if the engine speed is too low, driving behavior problems can arise, particularly when the internal combustion engine is idling.
  • US 5 775 099 describes a torque-neutral and ignition-safe method for increasing a fuel fraction in an air-fuel mixture of a direct-injection internal combustion engine for the purpose of NO x regeneration of a downstream NO x absorber.
  • a load-dependent method is shown in which the internal combustion engine is gradually switched from a lean stratified-charge operation with ⁇ > 1 to a rich or stoichiometric regeneration operation with ⁇ ⁇ 1 in the course of a continuously increasing load request, with a double injection being carried out in a medium load range with a first, in the intake stroke and a second in a compression stroke fuel injection.
  • This load-dependent regeneration corresponds to a spontaneous regeneration in which the operation with ⁇ ⁇ 1 is forced by the current operating situation of the internal combustion engine.
  • EP 0 598 917 A1 discloses an exhaust gas purification system with a NO x absorber, which is regenerated when an NO x loading of the absorber exceeds a predetermined threshold, the NO x loading being calculated as a function of a load and an engine speed.
  • a precondition for carrying out the load-dependent regeneration is a deceleration situation of the vehicle in which there is no load request, but a minimum speed.
  • EP 0 872 633 A2 discloses a load-dependent NO x regeneration method of a NO x storage catalytic converter, in which the regeneration is preferably carried out in overrun phases, that is to say when there is no load requirement, or in low load phases with loads below a predefinable load threshold value for reasons of torque neutrality ,
  • the problems mentioned, which occur in regeneration operation at high loads or speeds, are not taken into account in these processes.
  • the invention has for its object a recording and / or maintenance the regeneration operation taking into account the speed of the Control internal combustion engine and / or the requested loads.
  • this object is achieved by a method for regulating the Regeneration of the arranged in the exhaust duct of the internal combustion engine Storage catalyst solved with the features mentioned in claim 1.
  • map map and based on the map an operating range of Internal combustion engine in which the regeneration is maintained and / or can be included. So in a very simple way Regeneration operation under unfavorable operating parameters of the Internal combustion engine can be avoided.
  • the cited upper and lower limits and the operating range such that the Regeneration can be carried out in a torque-neutral manner.
  • FIG. 10 An arrangement 10 of a NO x storage catalytic converter 12 in an exhaust gas duct 14 of an internal combustion engine 16, in particular a diesel internal combustion engine, is shown schematically in FIG. Furthermore, sensors 18, 20 are arranged in the exhaust gas duct, which make it possible to determine a content of a gas component in the exhaust gas (gas sensors) or to record a temperature (temperature sensors). The number, position and type of such sensors 18, 20 are highly variable. A detection and evaluation of the signals of such sensors 18, 20 is known and will not be explained in more detail in the context of this description. In addition, it is possible in a known manner to calculate the content of the gas components or the temperature in selected areas of the arrangement 10 using suitable models.
  • a representation of the Internal combustion engine 16 associated means dispensed by a at least temporarily influencing at least one operating parameter of the Allow internal combustion engine 16 to regulate a working mode.
  • Such Means for influencing the operating parameters are well known. It is the same known to detect a catalyst temperature, for example by means of the sensor 20 and regulating the operating parameters of the internal combustion engine 16 in Depending on this catalyst temperature.
  • the internal combustion engine 16 If there is an excess of oxygen in excess of a fuel in the internal combustion engine 16 during a combustion process, the internal combustion engine 16 is in a working mode with ⁇ > 1 (lean operation). During the lean operation, the NO x that arises during the combustion process is absorbed in the NO x storage catalytic converter 12 until either an NO x desorption temperature is reached or an NO x storage capacity is exhausted.
  • reducing agents such as CO, HC or H 2 are generally produced to an increased extent.
  • regeneration mode the absorbed NO x is swapped out again (NO x desorption) and converted with the aid of the reducing agents on the NO x storage catalytic converter 12.
  • a catalytic converter state comprises a NO x , SO x or O 2 loading state and the catalytic converter temperature and can be detected directly via suitable sensors or calculated using storage catalytic converter models.
  • a need for regeneration can be determined from this in a known manner.
  • recording and / or maintaining the regeneration operation of the internal combustion engine 16 is additionally made dependent on a rotational speed of the internal combustion engine 16 and / or a requested load.
  • FIG. 2 shows an example of a ratio of the load to the speed of the Internal combustion engine 16 applied.
  • the inclusion and / or maintenance the regeneration operation takes place such that when a Predeterminable speed limit 22 and when falling below a predeterminable Lower speed limit 24 a regeneration mode of the internal combustion engine 16 is suppressed with ⁇ ⁇ 1.
  • a Predeterminable speed limit 22 and when falling below a predeterminable Lower speed limit 24 a regeneration mode of the internal combustion engine 16 is suppressed with ⁇ ⁇ 1.
  • a predeterminable load limit 26 is exceeded or when Falling below a predeterminable lower load limit 28 of the regeneration operation of the Internal combustion engine 16 suppressed.
  • the upper and lower limits 26, 28 selected such that the regeneration is as torque neutral as possible can be carried out. Accordingly, the load limit 26 can be at most one maximum injection quantity of an injection system of the internal combustion engine 16 correspond.
  • the lower load limit 28 is based on a minimum injection quantity, which is necessary to stop the regeneration operation, but not yet a change in torque of the internal combustion engine 16 leads.
  • the speed and the load can flow into a map and based on the map, an operating area 30 in which the regeneration can be maintained and / or recorded.
  • the limits the map can for example - as shown here - according to the specifiable upper and lower limits 22, 24, 26, 28 are selected, but are not necessarily dependent on these.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Claims (6)

  1. Procédé destiné au réglage d'une régénération d'un catalyseur à accumulation (12) disposé dans un tuyau de gaz d'échappement (14) d'un moteur à combustion interne (16), des moyens étant associés au moteur à combustion interne (16), qui permettent un réglage d'un mode de fonctionnement en influençant au moins temporairement au moins un paramètre de fonctionnement du moteur à combustion interne (16) et, pour la régénération du catalyseur à accumulation (12), le moteur à combustion interne (16) étant établi à un régime de régénération sur un mode de fonctionnement avec λ ≤ 1, et un déclenchement et/ou un maintien du régime de régénération du moteur à combustion interne (16) étant effectués en fonction d'une vitesse de rotation du moteur à combustion interne (16) et/ou d'une charge demandée, caractérisé en ce que, lors du dépassement d'une limite supérieure de vitesse de rotation (22) pouvant être prédéterminée et/ou lors du dépassement d'une limite supérieure de charge (26) pouvant être prédéterminée, le régime de régénération du moteur à combustion interne (16) en mode de fonctionnement avec λ ≤ 1 est supprimé.
  2. Procédé selon la revendication 1, caractérisé en ce que, lorsqu'une limite inférieure de vitesse de rotation (24) pouvant être prédéterminée n'est pas atteinte, le régime de régénération du moteur à combustion interne (16) est supprimé.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que, lorsqu'une limite inférieure de chargé (28) pouvant être prédéterminée n'est pas atteinte, le régime de régénération du moteur à combustion interne (16) est supprimé.
  4. Procédé selon la revendication 1, caractérisé en ce que la vitesse de rotation et la charge entrent dans un champ caractéristique, et en ce qu'une plage de fonctionnement (30), dans laquelle la régénération peut être maintenue et/ou déclenchée, est définie à l'aide du champ caractéristique.
  5. Procédé selon la revendication 4, caractérisé en ce qu'une plage de fonctionnement (30) est définie à l'aide de la limite supérieure de vitesse de rotation (22) et/ou de la limite inférieure de vitesse de rotation (24) et/ou de la limite supérieure de charge (26) et/ou de la limite inférieure de charge (28).
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la régénération est effectuée de façon neutre par rapport au couple de rotation.
EP00943972A 1999-07-10 2000-07-03 Procede de reglage de la regeneration d'un catalyseur a accumulation place dans un canal de gaz d'echappement d'un moteur a combustion interne Expired - Lifetime EP1200715B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19932301 1999-07-10
DE19932301A DE19932301A1 (de) 1999-07-10 1999-07-10 Verfahren zur Regelung einer Regeneration eines in einem Abgaskanal einer Verbrennungskraftmaschine angeordneten Speicherkatalysators
PCT/EP2000/006190 WO2001004468A1 (fr) 1999-07-10 2000-07-03 Procede de reglage de la regeneration d'un catalyseur a accumulation place dans un canal de gaz d'echappement d'un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1200715A1 EP1200715A1 (fr) 2002-05-02
EP1200715B1 true EP1200715B1 (fr) 2004-12-08

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EP00943972A Expired - Lifetime EP1200715B1 (fr) 1999-07-10 2000-07-03 Procede de reglage de la regeneration d'un catalyseur a accumulation place dans un canal de gaz d'echappement d'un moteur a combustion interne

Country Status (3)

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EP (1) EP1200715B1 (fr)
DE (2) DE19932301A1 (fr)
WO (1) WO2001004468A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1304458B1 (fr) * 2001-10-18 2005-08-10 Ford Global Technologies, LLC Procédé de régénération de filtre d'échappement d'un moteur à combustion interne
JP3829699B2 (ja) * 2001-11-28 2006-10-04 いすゞ自動車株式会社 排ガス浄化システム及びその再生制御方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4042563C2 (de) * 1989-12-27 1997-04-03 Nissan Motor Abgasreinigungsanlage zur Verwendung bei einer Brennkraftmaschine
DE69326217T3 (de) * 1992-06-12 2009-11-12 Toyota Jidosha Kabushiki Kaisha, Toyota-shi Abgasemissionssteuerungssystem für verbrennungsmotoren
US5775099A (en) * 1994-04-12 1998-07-07 Toyota Jidosha Kabushiki Kaisha Method of purifying the exhaust of an internal combustion engine
JP3079933B2 (ja) * 1995-02-14 2000-08-21 トヨタ自動車株式会社 内燃機関の排気浄化装置
DE19607151C1 (de) * 1996-02-26 1997-07-10 Siemens Ag Verfahren zur Regeneration eines NOx-Speicherkatalysators
DE19636040A1 (de) * 1996-09-05 1998-03-12 Volkswagen Ag Abgasreinigungsverfahren für eine Brennkraftmaschine
DE19636790A1 (de) * 1996-09-11 1998-03-12 Volkswagen Ag NOx-Abgasreinigungsverfahren
DE19716275C1 (de) * 1997-04-18 1998-09-24 Volkswagen Ag Verfahren zur Stickoxidreduzierung im Abgas einer Brennkraftmaschine
DE19741079C2 (de) * 1997-09-18 2001-10-18 Ford Global Tech Inc Verfahren zur Regeneration einer Stickoxidfalle im Abgassystem eines Verbrennungsmotors

Also Published As

Publication number Publication date
DE19932301A1 (de) 2001-01-11
WO2001004468A1 (fr) 2001-01-18
EP1200715A1 (fr) 2002-05-02
DE50008915D1 (de) 2005-01-13

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