EP1218627A1 - Verfahren zur regelung eines arbeitsmodus einer verbrennungskraftmaschine - Google Patents
Verfahren zur regelung eines arbeitsmodus einer verbrennungskraftmaschineInfo
- Publication number
- EP1218627A1 EP1218627A1 EP00949244A EP00949244A EP1218627A1 EP 1218627 A1 EP1218627 A1 EP 1218627A1 EP 00949244 A EP00949244 A EP 00949244A EP 00949244 A EP00949244 A EP 00949244A EP 1218627 A1 EP1218627 A1 EP 1218627A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- internal combustion
- combustion engine
- limit temperature
- temperature
- catalyst
- 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.)
- Granted
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
- 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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
- F02D41/1441—Plural 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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
-
- 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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/146—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration
- F02D41/1463—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases downstream of exhaust gas treatment apparatus
-
- 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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1486—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor with correction for particular operating conditions
-
- 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
- F02D2200/0802—Temperature of the exhaust gas treatment apparatus
Definitions
- the invention relates to a method for controlling a working mode of an internal combustion engine with the features mentioned in the preamble of claim 1.
- regeneration - that is, a change to the working mode with ⁇ ⁇ 1 - is initiated as a function of a catalyst temperature and / or a NO x storage capacity. If, for example, a predefinable limit temperature of the NO x storage catalytic converter is exceeded, stoichiometric or rich operation is maintained in the conventional methods until this limit temperature is again fallen below.
- a predefinable limit temperature of the NO x storage catalytic converter is exceeded, stoichiometric or rich operation is maintained in the conventional methods until this limit temperature is again fallen below.
- an exhaust gas temperature is generally higher in stoichiometric or rich operation than in lean operation, and thus cooling of the NO x storage catalyst is delayed.
- the limit temperature is selected with a relatively large safety margin from the actual NO x desorption temperature in order to dynamic operation of the internal combustion engine to ensure sufficiently low NO x emissions downstream of the NO x storage catalytic converter.
- the limit temperature is selected with a relatively large safety margin from the actual NO x desorption temperature in order to dynamic operation of the internal combustion engine to ensure sufficiently low NO x emissions downstream of the NO x storage catalytic converter.
- the object of the method according to the invention is to adapt the maintenance of the stoichiometric or rich operation of the internal combustion engine more closely to an actual catalytic converter state.
- the stoichiometric or rich operation should be shortened as far as possible and fuel consumption should be reduced.
- this object is achieved by the method for regulating the working mode of the internal combustion engine with the features mentioned in claim 1.
- a working mode with ⁇ ⁇ 1 is set when the catalyst temperature is exceeded above a predeterminable first limit temperature
- the internal combustion engine After the first limit temperature has been exceeded, the internal combustion engine is set to stoichiometric or rich operation, but the switch back to lean operation can take place independently of this first limit temperature. If the boundary conditions of the operation of the internal combustion engine permit lean operation, the change can also take place at a catalyst temperature above the first limit temperature. To avoid permanent switching between lean operation and stoichiometric or rich operation, however, the change is made dependent on the fact that the second limit temperature must first be exceeded. The second limit temperature is chosen such that lean operation above this temperature is definitely not sensible.
- the change to lean operation and its maintenance is controlled as a function of at least one of the operating parameters of the internal combustion engine. For example, an engine speed, a requested load, a space velocity of the exhaust gas, a vehicle speed or a content of at least one gas component in the exhaust gas can be taken into account.
- the continuously changing operating parameters can be included in the selection of the working mode during dynamic operation of the internal combustion engine. So it may not make much sense to switch to lean mode or to maintain it if it is foreseeable that, for example as a result of an acceleration process, an exhaust gas temperature and thus the catalyst temperature will shortly afterwards exceed the second limit temperature.
- the NO x emission downstream of the NO x storage catalytic converter is preferably monitored immediately after the change to lean operation. If the NO x emission exceeds a predeterminable threshold value, on the one hand there can be a direct change back to stoichiometric or rich operation and on the other hand - if the boundary conditions of the operation of the internal combustion engine allow it - a NO x reduction measure, such as a low -NO x - lean operation. In such a low NO x lean operation, a content of the NO x in the exhaust gas is reduced.
- a duration of a period of time for reaching a predeterminable cumulative NO x emission downstream of the NO x storage catalytic converter can be compared with a duration of a target period for reaching the predeterminable cumulative NO x emission. If the measured period falls below the target period, stoichiometric or rich operation is resumed. Overall, pronounced and oversized NO x emissions downstream of the NO x storage catalytic converter can thus be prevented during lean operation.
- Figure 1 shows an arrangement of a NO x storage catalyst in an exhaust duct of an internal combustion engine
- Figure 2 shows a course of a catalyst temperature
- 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 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 means assigned to the internal combustion engine has been dispensed with, which means that a working mode can be controlled by at least temporarily influencing at least one operating parameter of the internal combustion engine.
- Such means for influencing the operating parameters are well known and are therefore not explained in more detail here. It is also known to detect a catalyst temperature, for example by means of the sensor 20, and to control the operating parameters of the internal combustion engine as a function of 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 is in a working mode with ⁇ > 1 (lean operation). While During lean operation, the NO x that arises during the combustion process is absorbed in the NO x storage catalytic converter 12 until either a NO x desorption temperature or a NO x storage capacity is exceeded.
- reducing agents such as CO, HC or H2 are generally produced to an increased extent.
- the absorbed NOx is paged again and reacted with the help of the reducing agent in the NO x -Spei- cherkatalysator 12th
- the NO x storage capacity of the NO x storage catalytic converter 12 is temperature-dependent.
- the internal combustion engine 16 is therefore set to the working mode with ⁇ ⁇ 1 in the method according to the invention after a predeterminable first limit temperature G1 has been exceeded.
- a course of the temperature during such a regulation of the working mode of the internal combustion engine 16 is shown as an example in FIG.
- the catalyst temperature reaches the first limit temperature G1 and subsequently in a stoichiometric or rich phase tf-
- the catalyst temperature exceeds a predeterminable second limit temperature G2. From this moment on, a change to lean operation can take place again, but is not very sensible due to the high catalyst temperature, and therefore stoichiometric or rich operation is maintained in a stoichiometric or rich phase tf2. Since this makes it possible to change the working mode only after the second limit value G2 has been exceeded, permanent switching between lean and stoichiometric or rich operation can be avoided immediately after the first limit value G1 has been exceeded.
- the catalyst temperature subsequently falls below the second limit temperature G2
- a change to the lean operation can already take place in a phase t m 2. Since an exhaust gas temperature is generally lower in lean operation than in stoichiometric or rich operation, the NO x storage catalytic converter 12 can cool down more quickly.
- the change in the working mode can also be made dependent on at least one of the operating parameters of the internal combustion engine 16.
- a duration of a time span for reaching a predeterminable cumulative NO x emission downstream of the NO x storage catalytic converter 12 can also be compared with a duration of a target time span for reaching the predeterminable cumulative NO x emission and if the duration falls below the duration a change to stoichiometric or bold mode is initiated again for the duration of the desired time period.
- step S1 it is determined whether the catalyst temperature is between the first limit temperature G1 and the second limit temperature G2. If the catalyst temperature exceeds the second limit temperature G2, the query is terminated with a step S2 and, if necessary, reinitiated.
- a threshold can be set for the vehicle speed or the space velocity of the exhaust gas, from which a change to lean operation is no longer permitted. It is also conceivable to include the content of at least one gas component in the exhaust gas, in particular NO x .
- a switch to lean operation can take place in a step S5. Maintaining lean operation can be made dependent on the NO x emission downstream of the NO x storage catalytic converter 12.
- a step S6 for example by means of the sensor 20, the NO x emission downstream of the NO x storage catalytic converter 12 can be detected and compared with a predefinable threshold value for the NO x emission. By doing 3, however, the accumulated NO x emission downstream of the NO x storage catalytic converter 12 is recorded in step S6.
- a time counter is started with the change to lean operation in step S5.
- the time recording is stopped and the duration of the time period is measured.
- the duration of this time period is compared with the duration of the target time period for reaching the predeterminable cumulative NO x emission. Lean operation is maintained as long as the measured time period does not fall below the target time period (step 8).
- FIG. 4 shows an alternative embodiment of the regulation of the working mode of the internal combustion engine 16 according to FIG. 3.
- a decision process follows here on the basis of a predefinable threshold value for a NO x raw emission of the internal combustion engine 16 (step S5A). If the threshold is exceeded, in a step S5b can be checked whether a NO x -Mi quantitiessdorfdging can be grasped and, for example, the internal combustion engine 16 x in a low-NO -Mager réelle can be switched by the NO x -Rohemission is particularly low. If this is possible (step S5c), step S6 already explained follows again.
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)
- Output Control And Ontrol Of Special Type Engine (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19932290 | 1999-07-10 | ||
DE19932290A DE19932290A1 (de) | 1999-07-10 | 1999-07-10 | Verfahren zur Regelung eines Arbeitsmodus einer Verbrennungskraftmaschine |
PCT/EP2000/006191 WO2001004478A1 (de) | 1999-07-10 | 2000-07-03 | Verfahren zur regelung eines arbeitsmodus einer verbrennungskraftmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1218627A1 true EP1218627A1 (de) | 2002-07-03 |
EP1218627B1 EP1218627B1 (de) | 2004-11-17 |
Family
ID=7914332
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00949244A Expired - Lifetime EP1218627B1 (de) | 1999-07-10 | 2000-07-03 | Verfahren zur regelung eines arbeitsmodus einer verbrennungskraftmaschine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1218627B1 (de) |
AT (1) | ATE282769T1 (de) |
DE (2) | DE19932290A1 (de) |
WO (1) | WO2001004478A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10117434A1 (de) | 2001-04-03 | 2002-10-10 | Volkswagen Ag | Verfahren zur Steuerung eines Betriebsmodus einer magerlauffähigen Verbrennungskraftmaschine |
DE10152670A1 (de) * | 2001-10-05 | 2003-05-22 | Volkswagen Ag | Verfahren und Vorrichtung zur Steuerung einer magerlauffähigen Verbrennungskraftmaschine |
DE10201989A1 (de) * | 2002-01-21 | 2003-07-31 | Bosch Gmbh Robert | Verfahren zum Betreiben einer Brennkraftmaschine und Brennkraftmaschine |
DE10221536B4 (de) * | 2002-05-15 | 2011-05-26 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Verfahren zur Regelung eines Arbeitsmodus einer Verbrennungskraftmaschine |
DE10241497B3 (de) * | 2002-09-07 | 2004-04-22 | Audi Ag | Verfahren zur Steuerung des Magerbetriebs einer einen Stickoxid-Speicherkatalysator aufweisenden Brennkraftmaschine, insbesondere eines Kraftfahrzeuges |
US7603847B2 (en) * | 2003-03-21 | 2009-10-20 | Ford Global Technologies, Llc | Device and method for internal combustion engine control |
FR2862102B1 (fr) * | 2003-11-07 | 2007-06-22 | Peugeot Citroen Automobiles Sa | Systeme d'aide a la regeneration de moyens de depollution d'un moteur de vehicule |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
DE19607151C1 (de) * | 1996-02-26 | 1997-07-10 | Siemens Ag | Verfahren zur Regeneration eines NOx-Speicherkatalysators |
DE19636790A1 (de) * | 1996-09-11 | 1998-03-12 | Volkswagen Ag | NOx-Abgasreinigungsverfahren |
DE19731624A1 (de) * | 1997-07-23 | 1999-01-28 | Volkswagen Ag | Verfahren und Vorrichtung zur Überwachung der De-Sulfatierung bei NOx-Speicherkatalysatoren |
DE19739848A1 (de) * | 1997-09-11 | 1999-03-18 | Bosch Gmbh Robert | Brennkraftmaschine insbesondere für ein Kraftfahrzeug |
JP4346118B2 (ja) * | 1997-10-08 | 2009-10-21 | 株式会社デンソー | 内燃機関の触媒温制御装置 |
DE19746855A1 (de) * | 1997-10-23 | 1999-04-29 | Fev Motorentech Gmbh & Co Kg | Verfahren zur Abgasnachbehandlung bei Kolbenbrennkraftmaschinen mit Kraftstoff-Direkteinspritzung |
DE19747222C1 (de) * | 1997-10-25 | 1999-03-04 | Daimler Benz Ag | Verbrennungsmotoranlage mit Stickoxid-Speicherkatalysator und Betriebsverfahren hierfür |
DE19753718C1 (de) * | 1997-12-04 | 1999-07-08 | Daimler Chrysler Ag | Verfahren zum Betreiben eines Dieselmotors |
-
1999
- 1999-07-10 DE DE19932290A patent/DE19932290A1/de not_active Withdrawn
-
2000
- 2000-07-03 DE DE50008693T patent/DE50008693D1/de not_active Expired - Lifetime
- 2000-07-03 EP EP00949244A patent/EP1218627B1/de not_active Expired - Lifetime
- 2000-07-03 WO PCT/EP2000/006191 patent/WO2001004478A1/de active IP Right Grant
- 2000-07-03 AT AT00949244T patent/ATE282769T1/de not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO0104478A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE282769T1 (de) | 2004-12-15 |
DE19932290A1 (de) | 2001-01-11 |
DE50008693D1 (de) | 2004-12-23 |
WO2001004478A1 (de) | 2001-01-18 |
EP1218627B1 (de) | 2004-11-17 |
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