EP1301699A1 - Method for adapting a crude nox concentration - Google Patents
Method for adapting a crude nox concentrationInfo
- Publication number
- EP1301699A1 EP1301699A1 EP01955233A EP01955233A EP1301699A1 EP 1301699 A1 EP1301699 A1 EP 1301699A1 EP 01955233 A EP01955233 A EP 01955233A EP 01955233 A EP01955233 A EP 01955233A EP 1301699 A1 EP1301699 A1 EP 1301699A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nox
- lean
- lean phase
- phase
- storage
- 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
- 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
- F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
-
- 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
- F02D41/1444—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
- F02D41/1461—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 emitted by the engine
- F02D41/1462—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 emitted by the engine with determination means using an 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
- F02D2200/0806—NOx storage amount, i.e. amount of NOx stored on NOx trap
-
- 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
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D41/1402—Adaptive control
Definitions
- the invention relates to a method for adapting a raw NOx concentration of an internal combustion engine working with lean and rich phases, which is provided with a NOx storage reduction catalytic converter which is arranged in an exhaust gas duct of the internal combustion engine and adsorbs NOx from the exhaust gas during the lean phase and during the rich phase can convert the adsorbed NOx.
- NOx storage reduction catalysts hereinafter also referred to as NOx storage catalysts
- NOx storage catalytic converters Due to their coating, these NOx storage catalytic converters are able to adsorb NOx compounds from the exhaust gas during a storage phase.
- the storage phase of the NOx storage catalytic converter is also referred to as its loading phase.
- the adsorbed or stored NOx compounds are catalytically converted into harmless compounds.
- CO, H 2 and HC hydrocarbons
- the reducing agents are generated by briefly operating the internal combustion engine with a rich mixture and made available to the NOx storage catalytic converter in the form of exhaust gas components, as a result of which the stored NOx compounds in the catalytic converter are broken down.
- the object of the invention is to provide a method with which the raw NOx concentration of an internal combustion engine can be adapted as precisely as possible using simple means.
- the above process performs the following four process steps during an adaptation process for the raw NOx concentration.
- a first step the duration of a first lean phase is shortened in such a way that no NOx emission occurs behind the catalytic converter during the first lean phase.
- the NOx emissions in the course of a lean phase are known qualitatively: in a first section of the lean phase there is no or essentially no NOx emission behind the catalytic converter, which increases sharply from one point in time.
- the duration of the first lean phase is selected in the first process step so that the lean phase has ended before there is an increase in the NOx concentration after the catalyst.
- the amount of storage stored in the NOx storage catalytic converter is calculated during the lean phase.
- the amount of storage corresponds to the corrected NOx supply, since there is no breakthrough percentage in the first lean phase. Because the first lean phase has ended before there is a breakthrough.
- the calculated storage quantity is compared with a NOx loading of the NOx storage catalytic converter modeled for the first lean phase using a map, depending on the operating states.
- the NOx loading modeled neglecting the breakthrough should match the amount of storage, since there was no NOx emission after the catalytic converter during the first lean phase.
- the deviation of these two variables from one another is used in a fourth step for the adaptation. After adaptation of the raw NOx concentration, the internal combustion engine can be operated again using known methods.
- the advantage of the present method is that the shortening of the first lean phase enables simple determination of the NOx loading with simple means.
- the amount of memory is additionally determined in a second lean phase, the duration of which is further shortened compared to that of the first lean phase.
- the process steps from the adaptation cycle are essentially repeated with the first lean phase.
- the entire process sequence is represented as the repetition of two adaptation cycles with lean phases of different lengths, the first and second method steps for the second lean phase being carried out in the second cycle.
- the average storage amounts per time i.e.
- the loading is not proportional over time, i.e. during the lean phase, for example, the NOx concentration after the catalytic converter has already risen and the breakthrough amount is therefore not negligible. If there is no match, the first and the second lean phase are further shortened, the second adaptation cycle preferably taking the place of the first as the basic cycle.
- P- CL PH v ⁇ is located DJ DJ Tl tr hj P- H ⁇ DJ ⁇ iQ P ⁇ P P- 3 ⁇ DJ DJ PJ ⁇
- the NOx / 0 2 ratio can be taken into account with the aid of characteristic curves.
- the adaptation of the raw NOx concentration is expediently carried out in the fourth step via a correction factor for a reduction factor of the raw NOx concentration or for a correction factor directly for the raw NOx concentration.
- the change is preferably proportional to the difference between the storage quantity and the modeled NOx loading. It is also possible to make the change proportional to the difference of 1 and the quotient from the modeled NOx loading and the storage quantity.
- the curve marked 10 indicates the NOx concentration after the catalytic converter.
- time t 0 which is identified by 12
- regeneration of the NOx storage catalytic converter begins in normal storage / regeneration operation.
- the area marked with 14 specifies the amount of NOx (SM) stored up to.
- the proportion of the area below curve 10 indicates the breakthrough quantity DB, that is to say the quantity which has escaped up to the point in time t 0 . If the raw emission is now to be adapted, the threshold 12 is initially moved to 18. For example, the duration of the lean phase can be halved.
- the lean phase is shortened to a point in time 20 in a further adaptation cycle. If the amount of storage in the shortened lean phase is in the same ratio to the amount of storage in the longer lean phase 14 as the duration of the shorter lean phase to the duration of the longer lean phase, then no breakthrough has occurred and the storage catalytic converter has stored NOx in proportion to the duration of the lean phase.
- the amount of NOx emitted during an engine lean phase can be split up into the following parts:
- a first part is also converted into harmless substances by the exhaust gas cleaning system in lean operation, - a second part is stored in the NOx storage catalytic converter (SM) and a third part is released into the environment (DB) (breakthrough).
- SM NOx storage catalytic converter
- DB environment
- the integral of the corrected NOx concentration over the lean phase is calculated based on the raw NOx concentration stored in characteristic maps and the reduction factor.
- the value of the integral is the sum of the modeled NOx loading and (modeled) post-cat emission.
- SM should be equal to IKK if the mo- dellated, corrected raw NOx concentration corresponds to the actual raw NOx concentration reduced by the actual stationary reduction factor.
- a correction factor for the raw NOx concentration is calculated.
- the correction factor (RKKF) is determined depending on the modeled NOx loading (IKK) and the amount of storage (SM).
- IKK modeled NOx loading
- SM amount of storage
- the adaptation is carried out iteratively, the correction factor of the (n-l) th adaptation being changed in the case of an nth adaptation step.
- the raw NOx concentration is multiplied by the factor (1-RF), where RF denotes the reduction factor for the raw NOx concentration RK.
- the reduction factor takes into account, for example, the steady state conversion in the catalyst.
- the product is called the corrected raw NOx concentration.
- FIG 3 shows a flow chart for an alternative determination of the corrected raw NOx concentration.
- size 1-SM / IKK is amplified with an amplifier 24 and added with a correction factor for the reduction factor.
- the correction factor for the reduction factor RFKF is multiplied by the reduction factor RF, so that a corrected reduction factor is present.
- the factor (1-RFKFxRF) the corrected raw NOx concentration is calculated from the raw NOx concentration (RK).
- the difference between the values can be used as an alternative to the quotient of SM and IKK.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10034874 | 2000-07-18 | ||
DE10034874A DE10034874B4 (en) | 2000-07-18 | 2000-07-18 | Method for adapting a raw NOx concentration |
PCT/DE2001/002577 WO2002006653A1 (en) | 2000-07-18 | 2001-07-10 | Method for adapting a crude nox concentration |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1301699A1 true EP1301699A1 (en) | 2003-04-16 |
EP1301699B1 EP1301699B1 (en) | 2005-03-23 |
Family
ID=7649303
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01955233A Expired - Lifetime EP1301699B1 (en) | 2000-07-18 | 2001-07-10 | Method for adapting a crude nox concentration |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1301699B1 (en) |
DE (2) | DE10034874B4 (en) |
WO (1) | WO2002006653A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10249609B4 (en) * | 2002-10-18 | 2011-08-11 | Volkswagen AG, 38440 | Method for controlling a NOx storage catalytic converter |
DE10305635B4 (en) * | 2003-02-11 | 2011-01-13 | Continental Automotive Gmbh | Emission control method for lean-burn engines |
DE10307457B4 (en) * | 2003-02-21 | 2006-10-26 | Audi Ag | Method for operating a nitrogen oxide storage catalytic converter of an internal combustion engine |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19808382A1 (en) * | 1998-02-27 | 1999-09-02 | Volkswagen Ag | Control of a NOx absorber catalytic converter |
DE19836955A1 (en) * | 1998-08-14 | 2000-03-09 | Siemens Ag | Method for detecting and maintaining the operational readiness of a NO¶x¶ storage catalytic converter |
DE19844082C1 (en) * | 1998-09-25 | 1999-10-14 | Siemens Ag | Regeneration of a nitrogen oxides storage catalyst used with lean burn engine |
DE19847874A1 (en) * | 1998-10-16 | 2000-04-20 | Volkswagen Ag | Use of on-board diagnosis apparatus for monitoring nitrogen oxide absorption catalyst regeneration, includes examination of reliability-critical components on detection of anomalies |
FR2785331B1 (en) * | 1998-10-28 | 2000-12-22 | Renault | METHOD FOR CONTROLLING THE PURGE OF NITROGEN OXIDES FROM A CATALYTIC EXHAUST TREATMENT POT OF AN INTERNAL COMBUSTION ENGINE |
DE59910023D1 (en) * | 1998-11-09 | 2004-08-26 | Siemens Ag | METHOD FOR ADAPTING THE NOx RAW CONCENTRATION OF AN INTERNAL COMBUSTION ENGINE WORKING WITH EXCESS AIR |
DE19859176C2 (en) * | 1998-12-21 | 2003-07-10 | Siemens Ag | Procedure for checking the functionality of a lambda sensor |
DE19951544C1 (en) * | 1999-10-26 | 2000-12-07 | Siemens Ag | Operation of nitrogen oxides storage catalyst treating exhaust from lean burn engine, measures downstream exhaust gas oxygen concentration in strategy determining useful capacity to optimize rich regeneration extent |
-
2000
- 2000-07-18 DE DE10034874A patent/DE10034874B4/en not_active Expired - Fee Related
-
2001
- 2001-07-10 EP EP01955233A patent/EP1301699B1/en not_active Expired - Lifetime
- 2001-07-10 WO PCT/DE2001/002577 patent/WO2002006653A1/en active IP Right Grant
- 2001-07-10 DE DE50105704T patent/DE50105704D1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0206653A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1301699B1 (en) | 2005-03-23 |
DE10034874B4 (en) | 2004-01-22 |
DE50105704D1 (en) | 2005-04-28 |
WO2002006653A1 (en) | 2002-01-24 |
DE10034874A1 (en) | 2002-02-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE19828609A1 (en) | Regenerating a nitrogen oxides storage catalyst arranged in the exhaust gas stream of an IC engine | |
DE102018007421B4 (en) | Dynamic ammonia excess detection using a software algorithm to eliminate the ammonia sensor | |
EP1060003A1 (en) | CONTROL OF AN NOx-ABSORBING CATALYTIC CONVERTER | |
DE102005062120A1 (en) | Method and device for monitoring an exhaust aftertreatment system | |
EP1117909A1 (en) | Method and device for catalytically removing a pollutant from the exhaust gas of an internal combustion system | |
WO2004055346A1 (en) | Catalyst temperature modelling during exothermic operation | |
EP1311748A1 (en) | Method and model for modeling an elimination phase of a nitrogen oxide accumulating catalytic converter | |
DE102016222010B4 (en) | Method for controlling an internal combustion engine with a low-pressure exhaust gas recirculation system | |
DE102011087082B4 (en) | Method of operating a SCRF catalyst system | |
DE102014112615B4 (en) | Oxygen purge control method and vehicle exhaust system for catalytic converters of two types | |
WO2001018367A1 (en) | Method for operating an internal combustion engine | |
EP1301699A1 (en) | Method for adapting a crude nox concentration | |
DE102021207934A1 (en) | Method, computing unit and computer program for operating an SCR catalytic converter | |
DE102019210739A1 (en) | Exhaust gas treatment system and method for operating an exhaust gas treatment system | |
DE102020134321A1 (en) | Analog / digital converter for temperature sensors in vehicles | |
EP1180210A1 (en) | Method and device for controlling an internal combustion engine with an exhaust treatment system | |
DE102018203859A1 (en) | Method, processing and control unit and arrangement for regenerating an LNT catalyst and motor vehicle | |
DE10038461A1 (en) | Determining distribution of nitrate and sulfate in nitrogen oxide storage catalyst involves employing finite element model describing local nitrogen oxide and sulfur oxide exchange in terms of storage efficiency factors | |
DE19944009A1 (en) | Method for operating an SCR catalytic converter | |
EP1096125A2 (en) | Method for controlling the operation of a NOx storage catalytic converter | |
DE19926305C2 (en) | Method for controlling the operation of a NOx storage catalytic converter | |
DE10156476B4 (en) | Method for detecting the progressive sulfurization of a NOx storage catalytic converter | |
DE102008062058A1 (en) | Method for operating combustion engine, involves predetermining tolerance time point, tolerance time duration and tolerance amount of reducing agent dependent on actually determined total service performance of combustion engine | |
DE102017219047B3 (en) | Method for operating an exhaust aftertreatment device | |
DE102017100151A1 (en) | Method for monitoring an SCR catalyst |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20030109 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
RBV | Designated contracting states (corrected) |
Designated state(s): DE FR |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D Free format text: GERMAN |
|
REF | Corresponds to: |
Ref document number: 50105704 Country of ref document: DE Date of ref document: 20050428 Kind code of ref document: P |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
ET | Fr: translation filed | ||
26N | No opposition filed |
Effective date: 20051227 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20080715 Year of fee payment: 8 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20100331 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090731 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20180731 Year of fee payment: 18 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 50105704 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20200201 |