DE10123682A1 - Process for desulfurizing a NOx storage device in an internal combustion engine - Google Patents

Process for desulfurizing a NOx storage device in an internal combustion engine

Info

Publication number
DE10123682A1
DE10123682A1 DE10123682A DE10123682A DE10123682A1 DE 10123682 A1 DE10123682 A1 DE 10123682A1 DE 10123682 A DE10123682 A DE 10123682A DE 10123682 A DE10123682 A DE 10123682A DE 10123682 A1 DE10123682 A1 DE 10123682A1
Authority
DE
Germany
Prior art keywords
knock
fuel
sensitivity
fuel consumption
determined
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.)
Withdrawn
Application number
DE10123682A
Other languages
German (de)
Inventor
Florian Preuss
Stefan Detterbeck
Hanns-Christian Hasenclever
Matthew Keenan
Stephan Ramatschi
Peter Mueller
Hans-Volker Schaefer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Priority to DE10123682A priority Critical patent/DE10123682A1/en
Priority to AT02007800T priority patent/ATE333040T1/en
Priority to DE50207467T priority patent/DE50207467D1/en
Priority to EP02007800A priority patent/EP1258620B1/en
Publication of DE10123682A1 publication Critical patent/DE10123682A1/en
Withdrawn legal-status Critical Current

Links

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
    • F01N3/0807—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
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/027—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using knock sensors
    • 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
    • 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
    • F01N2570/04—Sulfur or sulfur oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0611—Fuel type, fuel composition or fuel quality
    • F02D2200/0612—Fuel type, fuel composition or fuel quality determined by estimation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0818—SOx storage amount, e.g. for SOx trap or NOx trap

Abstract

In a process to remove sulfur from an automotive NOx storage trap operated in lean burn mode, a calculation model determines the sulfur removal steps. The steps are modified using information derived from a knock signal and the fuel anti-knock sensitivity, fuel consumption. The fuel consumption is determined during a lean burn phase of motor operation. The fuel consumption is determined since the previous sulfur removal cycle. A relationship is established between the knock-sensitivity and the fuel sulfur concentration. The relationship between knock-sensitivity and sulfur concentration is held in a memory device. A correctional parameter is determined using the knock-sensitivity and fuel consumption. This parameter is incorporated in the calculation model and is determines the sulfur removal process intervals.

Description

Die Erfindung betrifft ein Verfahren zur Desulfatisierung eines NOx-Speichers bei einem Verbrennungsmotor gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for desulfating a NO x storage device in an internal combustion engine according to the preamble of claim 1.

Es ist bekannt, Motoren zumindest zum Teil in einem Magermodus zu betreiben, um den Kraftstoffverbrauch zu senken. Bei dieser Betriebsweise werden jedoch Stick­ stoffoxide frei, die zur Verminderung der Umweltbelastung zunächst in einem sog. NOx-Speicher zwischengespeichert und dann regelmäßig in einem Regenerati­ onsprozeß bei einer fetten Betriebsweise des Verbrennungsmotors beseitigt wer­ den. Üblicherweise kann mit einem sog. NOx-Sensor die Stickoxidbelastung des Speichers erkannt und damit der Regenerationsablauf gesteuert werden.It is known to operate engines at least partially in a lean mode in order to reduce fuel consumption. In this mode of operation, however, nitrogen oxides are released, which are temporarily stored in a so-called NO x accumulator to reduce the environmental impact and then regularly eliminated in a regeneration process in a rich mode of operation of the internal combustion engine. Typically, the so-called NO x sensor can be used to identify the nitrogen oxide load in the storage and thus to control the regeneration process.

Durch Detektion der Stickoxidbelastung der Abgase nach dem NOx-Speicher kann mittels geeigneter Modelle überdies auf die Schwefelbelastung des NOx-Speichers geschlossen werden.By detecting the nitrogen oxide pollution of the exhaust gases after the NO x storage, suitable models can also be used to infer the sulfur loading of the NO x storage.

Bei Motorsteuersystemen ohne einen NOx-Sensor wird herkömmlicherweise ein Schwefelbeladungsmodell zur Beurteilung des Ausmaßes der Schwefeleinlagerung im NOx-Speicher verwendet, wobei das Schwefelbeladungsmodell üblicherweise so ausgelegt ist, dass auch bei überwiegenden Kurzstrecken und im Stadtbetrieb eine künstliche, ausreichend frühe Desulfatisierung angefordert und durchgeführt wird. In engine control systems without a NO x sensor, a sulfur loading model is conventionally used to assess the extent of sulfur storage in the NO x storage, the sulfur loading model usually being designed in such a way that an artificial, sufficiently early desulfation is requested and carried out, even for predominantly short distances and in urban use becomes.

Diese "künstlich eingeleitete" Desulfatisierung wird also auch dann durchgeführt, wenn der Speicher noch nicht entsprechend stark mit Schwefel beladen ist. Dies führt herkömmlicherweise zu einem höheren Kraftstoffaufwand, da bei den heute üblichen, hochwertigen, schwefelarmen Kraftstoffen zu häufig desulfatisiert wird.This "artificially initiated" desulfation is also carried out if the storage is not yet heavily loaded with sulfur. This traditionally leads to higher fuel consumption, as with today's usual, high-quality, low-sulfur fuels is desulfated too often.

Aufgabe der vorliegenden Erfindung ist es, ein Verfahren der eingangs genannten Art mit einer bedarfsgerechten Desulfatisierung zur Verfügung zu stellen.The object of the present invention is a method of the aforementioned Provide species with a desulfation that meets the needs.

Ansatz bei der vorliegenden Erfindung ist der Gedanke, dass ein Zusammenhang zwischen der Klopfempfindlichkeit und dem Schwefelgehalt eines Kraftstoffs be­ steht. Zumeist sind nämlich hochschwefelhaltige Kraftstoffe auch wenig klopffest. Die Auswertung der Klopfregelung in Verbindung mit einer Verbrauchsermittelung (z. B. über Einspritzvorgänge oder eine Tankfüllstandsauswertung), findet erfin­ dungsgemäß in die Modellrechnung Eingang, so dass bei einem qualitativ hochwer­ tigen, schwefelarmen Kraftstoff, nicht mit der Häufigkeit, wie bei einem herkömmli­ chen System, desulfatisiert werden muss. Durch das Erkennen der klopfempfindli­ chen Kraftstoffe kann somit eine Verbesserung des Modells hinsichtlich des aktuel­ len Schwefelgehaltes im Tank erreicht werden, was wiederum zu einer exakteren Abschätzung des Verschwefelungsgrades und so zu einer Verringerung des Kraft­ stoffaufwandes führt. Überdies ist es möglich, einen teueren zusätzlichen NOx- Sensor zu vermeiden. Allgemein ist es also mit der vorliegenden Erfindung ohne weiteres möglich, häufige Desulfatisierungsvorgänge zu vermeiden und trotzdem eine Überladung des NOx-Speichers mit Schwefeloxiden zu verhindern.Approach to the present invention is the idea that there is a connection between the knock sensitivity and the sulfur content of a fuel. Most of the time, fuels containing high sulfur are not very resistant to knock. The evaluation of the knock control in conjunction with a consumption determination (e.g. via injection processes or a tank fill level evaluation) is incorporated into the model calculation according to the invention, so that with a high-quality, low-sulfur fuel, not with the frequency as with a conventional one System that needs to be desulfated. By recognizing the knock-sensitive fuels, an improvement of the model with regard to the current sulfur content in the tank can be achieved, which in turn leads to a more precise estimate of the degree of sulfurization and thus to a reduction in fuel consumption. Furthermore, it is possible to avoid an expensive additional NO x sensor. In general, it is therefore easily possible with the present invention to avoid frequent desulphation processes and still prevent the NO x accumulator from being overloaded with sulfur oxides.

Bei einer Ausführungsform der vorliegenden Erfindung wird eine normale Modellbe­ rechnung, wie sie aus dem Stand der Technik bereits bekannt ist, verwendet. Zu­ dem wird das Klopfsignal oder die Klopfregelung, welche in der Motorsteuerung in den meisten Fällen vorhanden ist, ausgewertet und eine Klopfempfindlichkeit des Kraftstoffes bestimmt. Zudem wird der die Menge des verbrauchten Kraftstoffes, insbesondere während des Magerbetriebs, ermittelt und ausgewertet. Auf den Kraft­ stoffverbrauch kann man beispielsweise über die Auswertung der Einspritzvorgänge oder die Tankfüllstandsauswertung schließen. Natürlich sind auch andere Möglich­ keiten denkbar, wir man auf den Kraftstoffverbrauch allgemein schließen kann. Aus den beiden Größen Klopfempfindlichkeit und Kraftstoffverbrauch kann sodann eine Größe bestimmt werden, die in die Modellrechnung einbezogen wird und sich so auswirkt, dass bei einem Kraftstoff mit hoher Klopfneigung in kürzeren Intervallen eine Desulfatisierung vorgenommen wird. Bei einem Kraftstoff mit einer weniger großen Klopfneigung werden die Desulfatisierungsintervalle weiter auseinander ge­ wählt. In einem Kennfeld ist dabei eine Relation zwischen der Klopfempfindlichkeit und der Schwefelkonzentration im Kraftstoff abgelegt, wobei man je nach Klopfnei­ gung auf die Schwefelkonzentration schließt.In one embodiment of the present invention, a normal model is used calculation, as it is already known from the prior art, used. to the knock signal or the knock control, which is in the engine control in is present in most cases, evaluated and a knock sensitivity of the Fuel determined. In addition, the amount of fuel used, determined and evaluated in particular during lean operation. On the strength You can use the material, for example, by evaluating the injection processes or close the tank level evaluation. Of course, other options are also possible conceivable, we can generally conclude on fuel consumption. Out The two sizes knock sensitivity and fuel consumption can then  Size can be determined, which is included in the model calculation and so affects that with a fuel with a high tendency to knock in shorter intervals desulfation is carried out. For a fuel with one less With a great tendency to knock, the desulfation intervals are further separated chooses. In a map there is a relation between the knock sensitivity and the sulfur concentration in the fuel, depending on the knock close to the sulfur concentration.

Die vorliegende Erfindung erlaubt somit auf einfache und sehr kostengünstige Wei­ se eine bedarfsgerechte Adaption der Desulfatisierungsschritte durchzuführen.The present invention thus allows in a simple and very inexpensive way se to adapt the desulfation steps as required.

Claims (6)

1. Verfahren zur Desulfatisierung eines NOx-Speichers bei einem Verbrennungsmotor, der zumindest zum Teil in einem Magermodus betrieben wird, wobei eine Modellrechnung zur Bestimmung eines Desulfatisierungsschrittes durchgeführt wird, dadurch gekennzeichnet,
dass ein Klopfsignal oder eine Klopfregelung ausgewertet und eine Klopf­ empfindlichkeit des Kraftstoffes bestimmt wird,
dass ein Kraftstoffverbrauch bestimmt wird, und
dass die Modellberechung in Abhängigkeit von der Klopfempfindlichkeit des Kraftstoffes und der Tankfüllstandsauswertung durchgeführt wird.1. A method for the desulfation of a NO x storage device in an internal combustion engine which is operated at least in part in a lean mode, a model calculation for determining a desulfation step being carried out, characterized in that
that a knock signal or a knock control system is evaluated and a knock sensitivity of the fuel is determined,
that fuel consumption is determined, and
that the model calculation is carried out depending on the knock sensitivity of the fuel and the tank level evaluation. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Kraftstoffverbrauch während des Betriebs im Magermodus be­ stimmt wird.2. The method according to claim 1, characterized, that the fuel consumption during operation in lean mode be is true. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Kraftstoffverbrauch seit der letzten Desulfatisierung bestimmt wird. 3. The method according to claim 1 or 2, characterized, that fuel consumption has been determined since the last desulfation.   4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass eine Relation zwischen der Klopfempfindlichkeit und der Schwefelkon­ zentration im Kraftstoff bestimmt wird.4. The method according to any one of claims 1 to 3, characterized, that a relation between the knock sensitivity and the sulfur con concentration in the fuel is determined. 5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die Relation zwischen Klopfempfindlichkeit und Schwefelkonzentration in einem Kennfeld oder einer Kennlinien abgelegt ist.5. The method according to claim 4, characterized, that the relationship between knock sensitivity and sulfur concentration is stored in a map or a characteristic curve. 6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass aus der Klopfempfindlichkeit und dem Kraftstoffverbrauch ein Korrek­ turparameter bestimmt wird, der in die Modellrechnung eingeht und die Zeit­ räume zur und/oder der Desulfatisierung ändert.6. The method according to any one of claims 1 to 5, characterized, that from the knock sensitivity and the fuel consumption a correction tur parameter is determined, which goes into the model calculation and the time rooms for and / or desulfating changes.
DE10123682A 2001-05-16 2001-05-16 Process for desulfurizing a NOx storage device in an internal combustion engine Withdrawn DE10123682A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE10123682A DE10123682A1 (en) 2001-05-16 2001-05-16 Process for desulfurizing a NOx storage device in an internal combustion engine
AT02007800T ATE333040T1 (en) 2001-05-16 2002-04-06 METHOD FOR DESULFATIZING A NOX STORAGE IN AN COMBUSTION ENGINE
DE50207467T DE50207467D1 (en) 2001-05-16 2002-04-06 Process for desulfating a NOx storage tank in an internal combustion engine
EP02007800A EP1258620B1 (en) 2001-05-16 2002-04-06 Method for desulfating an NOx absorber in internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE10123682A DE10123682A1 (en) 2001-05-16 2001-05-16 Process for desulfurizing a NOx storage device in an internal combustion engine

Publications (1)

Publication Number Publication Date
DE10123682A1 true DE10123682A1 (en) 2002-12-19

Family

ID=7684910

Family Applications (2)

Application Number Title Priority Date Filing Date
DE10123682A Withdrawn DE10123682A1 (en) 2001-05-16 2001-05-16 Process for desulfurizing a NOx storage device in an internal combustion engine
DE50207467T Expired - Fee Related DE50207467D1 (en) 2001-05-16 2002-04-06 Process for desulfating a NOx storage tank in an internal combustion engine

Family Applications After (1)

Application Number Title Priority Date Filing Date
DE50207467T Expired - Fee Related DE50207467D1 (en) 2001-05-16 2002-04-06 Process for desulfating a NOx storage tank in an internal combustion engine

Country Status (3)

Country Link
EP (1) EP1258620B1 (en)
AT (1) ATE333040T1 (en)
DE (2) DE10123682A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4235069B2 (en) * 2003-09-12 2009-03-04 トヨタ自動車株式会社 Internal combustion engine exhaust purification catalyst control device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5657625A (en) * 1994-06-17 1997-08-19 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Apparatus and method for internal combustion engine control
JP2000073925A (en) * 1998-09-03 2000-03-07 Nippon Soken Inc Knock control device
US6116208A (en) * 1998-09-29 2000-09-12 Mazda Motor Corporation Control system for a direct injection-spark ignition engine
DE10018333A1 (en) * 1999-05-19 2000-11-23 Ford Global Tech Inc Procedure for controlling operation of lean-mix IC engine has determination of characteristic values for incremental NOX amount generated during lean-mix operating state and stored in trap

Also Published As

Publication number Publication date
EP1258620A2 (en) 2002-11-20
ATE333040T1 (en) 2006-08-15
EP1258620A3 (en) 2005-04-13
DE50207467D1 (en) 2006-08-24
EP1258620B1 (en) 2006-07-12

Similar Documents

Publication Publication Date Title
DE102011017167B4 (en) Pre-ignition estimation / control apparatus for an internal combustion engine
DE102006056708B4 (en) Method, device and computer program for determining cylinder-specific Verbrennugsmerkmale an internal combustion engine
DE60127013T2 (en) Control to improve the behavior of a vehicle
DE10137421B4 (en) Exhaust emission control device and method for an internal combustion engine
DE19726757B4 (en) Method for controlling and / or regulating an internal combustion engine provided with a plurality of combustion chambers
WO2006128782A1 (en) Method and device for determining the oxygen storage capacity of the exhaust gas catalytic converter of an internal combustion engine, and method and device for determining a dynamic time duration for exhaust gas probes of an internal combustion engine
EP1250525B1 (en) Method and device for controlling an internal combustion engine
DE102010035365A1 (en) Method for determining the oxygen storage capacity of a catalytic converter and method for determining a time delay inherent in a lambda sensor
WO2000028200A1 (en) METHOD FOR DETERMINING THE NOx CRUDE EMISSION OF AN INTERNAL COMBUSTION ENGINE OPERATED WITH AN EXCESS OF AIR
DE19926139A1 (en) Calibration of a NOx sensor
EP1305507A1 (en) Method for operating a catalyst
DE102006043341B4 (en) Method for determining the ethanol content of the fuel in a motor vehicle
DE10123682A1 (en) Process for desulfurizing a NOx storage device in an internal combustion engine
DE19581053B4 (en) Method and device for adaptive fuel metering in two-stroke engines
DE102004062408A1 (en) Method and device for determining an oxygen storage capacity of the exhaust gas catalytic converter of an internal combustion engine and method and device for determining a dynamic time duration for exhaust gas probes of an internal combustion engine
DE102008005883B4 (en) Method and device for operating an internal combustion engine
DE102008046719B3 (en) Method and device for determining the ethanol content of the fuel in a motor vehicle
DE102006015970B4 (en) Method for reducing soot emissions in internal combustion engines
DE19963927A1 (en) Method for operating a storage catalytic converter of an internal combustion engine
DE102007061229A1 (en) Control strategy adjusting method for combustion controlling of high power-diesel internal-combustion engine of motor vehicle, involves starting controlling of injectors by null quantity calibration in dependent of variable of controller
DE10313216B4 (en) Method for operating a nitrogen oxide (NOx) storage catalytic converter arranged in the exhaust region of an internal combustion engine
DE19859176C2 (en) Procedure for checking the functionality of a lambda sensor
DE102005051078A1 (en) Ignition control on Kraftstoffeinfüllbasis
DE102016206437A1 (en) Process for the regeneration of a particulate filter in the exhaust system of an internal combustion engine
DE4227431A1 (en) Determining air mass taken into each cylinder of vehicle IC engine - using crankshaft markings to define suction phase of cylinders and integrating value of volume flow for each cylinder

Legal Events

Date Code Title Description
OR8 Request for search as to paragraph 43 lit. 1 sentence 1 patent law
8105 Search report available
8130 Withdrawal