EP1131549B1 - PROCEDE POUR ADAPTER LA CONCENTRATION BRUTE EN NOx D'UN MOTEUR A COMBUSTION INTERNE FONCTIONNANT AVEC UN EXCEDENT D'AIR - Google Patents

PROCEDE POUR ADAPTER LA CONCENTRATION BRUTE EN NOx D'UN MOTEUR A COMBUSTION INTERNE FONCTIONNANT AVEC UN EXCEDENT D'AIR Download PDF

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Publication number
EP1131549B1
EP1131549B1 EP99962044A EP99962044A EP1131549B1 EP 1131549 B1 EP1131549 B1 EP 1131549B1 EP 99962044 A EP99962044 A EP 99962044A EP 99962044 A EP99962044 A EP 99962044A EP 1131549 B1 EP1131549 B1 EP 1131549B1
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Prior art keywords
nox
nox concentration
phase
lean burn
internal combustion
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Expired - Lifetime
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EP99962044A
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German (de)
English (en)
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EP1131549A1 (fr
Inventor
Hong Zhang
Corinna Pfleger
Wolfgang Ludwig
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Siemens AG
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Siemens AG
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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
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D41/1402—Adaptive control
    • 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
    • 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

Definitions

  • the invention relates to a method for adapting a NOx raw concentration value of an excess air Internal combustion engine according to the preamble of claim 1.
  • NOx storage reduction catalysts hereinafter referred to simply as NOX storage catalysts. Due to their coating, these NOx storage catalysts are able, during a storage phase, also referred to as a loading phase, to adsorb NOx compounds from the exhaust gas which are produced during lean combustion. During a regeneration phase, the adsorbed or stored NOx compounds are converted into harmless compounds with the addition of a reducing agent.
  • a reducing agent for lean-burn gasoline engines CO, H 2 and HC (hydrocarbons) can be used. These are generated by short-term operation of the internal combustion engine with a rich mixture and provided to the NOx storage catalytic converter as exhaust gas components, whereby the stored NOx compounds are degraded in the catalyst.
  • the adsorption efficiency of such a NOx storage catalyst drops with higher NOx loading level.
  • degree of loading is the quotient of the current, absolute NOx load and the maximum NOx storage capacity.
  • the calculated degree of loading can be used to control the lean and Grease cycles of the internal combustion engine are used. It It can be seen that to determine the degree of loading a as accurate as possible knowledge of both the current load and also the maximum storage capacity is necessary.
  • the maximum storage capacity can be on the engine test bench by measuring the amount of NOx stored per unit time until to reach a saturation state, while saturating the NOx storage catalyst in the motor vehicle for emission reasons is not possible. Indeed subject to this storage capacity an aging process, so that it is necessary to adapt them over the vehicle running distance. For this one needs either the value for the momentary Loading and / or a very accurate value for the NOx raw emissions the internal combustion engine. As raw emissions are generally referred to the emission without exhaust aftertreatment.
  • NOx raw concentration values are the measurement of a reference internal combustion engine on a test bench and the filing of the data in suitable maps. The reading out of these maps provides only meaningful results, if the NOx raw concentration values of various internal combustion engines a series does not fluctuate too much. Exceed the Fluctuations in NOx raw concentration levels to a certain extent, is an adaptation of the NOx raw concentration values of the internal combustion engine necessary in the vehicle.
  • the invention has for its object to provide a method with the NOx raw concentration values of an internal combustion engine of the type mentioned in a simple way can be adapted.
  • the operating point dependent Values for the raw NOx concentration of the internal combustion engine read out of a map and the adaptation the concentration variations are based on the output signal one downstream of the NOx storage catalyst arranged NOx sensor either by modification of a Reduction factor used to calculate the corrected NOx raw concentration from the NOx raw concentration values, or by direct correction of the read out of the map Values for the NOx raw concentration with a raw concentration correction factor.
  • Fig. 1 is a lean-burn engine in the form of a block diagram with a NOx exhaust aftertreatment system shown used in the inventive method becomes. Only the components are shown, which are for Understanding the invention are necessary.
  • the lean-burn engine 10 is via an intake passage 11 supplied an air / fuel mixture.
  • intake passage 11th are seen in the flow direction of the sucked air in succession a load sensor in the form of an air mass meter 12, a throttle block 13 with a throttle valve 14 and a not shown throttle valve sensor for detection the opening angle of the throttle valve 14 and according to the Number of cylinders a set injectors 15 provided by which only one is shown.
  • the inventive method but is also applicable to a system in which the fuel injected directly into the respective cylinder (Direct injection).
  • the internal combustion engine 10 On the output side, the internal combustion engine 10 with an exhaust passage 16 connected.
  • this exhaust passage 16 is an exhaust aftertreatment system intended for lean exhaust gas.
  • she consists arranged from a near the internal combustion engine 10 Pre-catalyst 17 (3-way catalyst) and one in the flow direction of the exhaust gas downstream of the primary catalytic converter 17 NOx storage catalyst 18.
  • the sensor system for the exhaust aftertreatment system includes a Sauerstoffmeßauf disturbing 19 upstream of the pre-catalyst 17, a temperature sensor 20 in the connecting pipe between the pre-catalyst 17 and NOx storage catalyst 18 near the inlet region thereof and a further exhaust gas sensor 21 downstream of the NOx storage catalyst 18th
  • the temperature sensor 20 which detects the exhaust gas temperature and from whose signal the temperature of the NOx storage catalytic converter 18 can be calculated by means of a temperature model
  • such a temperature sensor 201 is shown with a dashed line, which measures the monolith temperature of the NOx storage catalyst 18 directly.
  • the calculation or measurement of the temperature of the NOx storage catalytic converter 18 is optimized for consumption and emissions Control of the system required. Based on this measured, calculated or modeled temperature signal also become Katalysatorcream- or catalyst protection measures initiated.
  • Sauerstoffmeßauf choir 19 is preferably a broadband lambda probe used, which depends on the oxygen content in the exhaust a steady, e.g. linear output signal emits.
  • This function takes over a known lambda control device 22, preferably in a the operation of the internal combustion engine 10 controlling Control device 23 is integrated.
  • Such electronic control devices include a microprocessor and in addition to the fuel injection and the ignition a lot more Control tasks, i.a. also the control of the exhaust aftertreatment system take over, are known per se, so that in the following only on the in connection with the invention relevant structure and its functioning received becomes.
  • the control device 23 is provided with a Memory device 24 is connected, in the u.a. various Characteristic curves or maps KF1, KF2, as well as correction factors RFKF and RKKF are stored, their respective meaning the description of the following figures even closer is explained.
  • a temperature sensor 29 detects a temperature of the internal combustion engine corresponding signal, for example via a Measurement of the coolant temperature.
  • the speed of the internal combustion engine is using a mark the crankshaft or a sensor wheel connected to it Detected sensors 30.
  • the output of the air mass meter 12 and the signals the throttle position sensor, the Sauerstoffmeßaufsacrificings 19, the exhaust gas probe 21, the temperature sensors 20, 29, and the Speed sensor 30 are via corresponding connecting lines the control device 23 is supplied.
  • Control device 23 For controlling and regulating the internal combustion engine 10 is the Control device 23 except with an ignition device 27th for the air-fuel mixture over a only schematically illustrated Data and control line 28 with additional, not explicitly shown sensors and actuators connected.
  • an exhaust gas sensor Downstream of the NOx storage catalyst 18 is in the exhaust passage an exhaust gas sensor arranged in the form of a NOx sensor 21, its output signal for controlling memory regeneration and for adapting model sizes, e.g. the oxygen- or NOx storage capacity of the NOx storage catalyst 18, and for detecting the aging state of the NOx storage catalyst is used. It also comes with the output signal of the NOx sensor 21, if necessary, the raw NOx emission adapted to the internal combustion engine.
  • control device 23 by processing stored control routines et al the load state of the internal combustion engine detected, the NOx raw emissions determined and adapted the internal combustion engine, and determines the degree of loading of the NOx storage catalytic converter.
  • the most accurate knowledge of the corrected NOx raw concentration KK is for catalyst control via the calculation the degree of loading and the aging adaptation of Storage capacity needed.
  • FIG. 2 shows a diagram in which the abovementioned proportions that of the internal combustion engine during the lean phase emitted raw NOx emission are registered.
  • the lean phase is over and a regeneration phase for the NOx storage catalyst 18 is requested.
  • the hatched Areas characterize the individual quantities of NOx stationary Sales volume SU, storage volume SM and breakthrough volume DB.
  • KK (n-1) is the corrected raw NOx concentration before the current adaptation process
  • KK (n) is the corrected NOx raw concentration after the current one Termed adaptation.
  • the associated values for the stationary sales concentration SK (n-1) for an uncorrected reduction bomb and at a corrected reduction factor SK (n) are also drawn.
  • FIG. 3 is a first block diagram Embodiment for the adaptation of the NOx concentration fluctuations by modification of the reduction factor RF, the for calculating the corrected raw NOx concentration from the NOx raw concentration is shown.
  • the corrected NOx raw concentration KK is doing with the help of the signal of downstream of the NOx storage catalyst arranged NOx sensor 21 determined and adapted if necessary.
  • the adaptation is during a cycle consisting of lean and Fat phase performed as follows. Be first Breakthrough amount DB and the storage amount SM determined.
  • the Breakthrough amount DB is measured in the lean phase by measuring the After-Kat-NOx concentration with the NOx sensor 21 and its Integration detected over the lean phase duration.
  • the amount of memory SM in the lean phase may be in the lean phase following Fat phase can be calculated. For this purpose it is assumed the additional, not to stoichiometric combustion required fuel mass flow is used to reduce the stored NOx mass and to exhaust the stored Used oxygen.
  • the NOx raw concentration stored in the map KF1 RK and the filed in a map KF2 Reduction factor RF becomes the integral of the corrected NOx concentration calculated over the lean phase IKK.
  • the NOx raw concentration For example, RK is dependent on some or all the following parameters: speed, load, Ignition angle, air ratio, exhaust gas recirculation rate, intake air temperature, Coolant temperature.
  • the Correction factor RFKF for the reduction factor RF with which the Reduction factor RF is multiplied, in a suitable manner reduced or enlarged. He is downsized, though IKK ⁇ DB + SM is and it is increased if IKK> DB + SM.

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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)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Claims (8)

  1. Procédé pour adapter une valeur de concentration brute en NOx (RK) d'un moteur à combustion interne fonctionnant avec un excédent d'air (10) au moins sur certaines plages de fonctionnement, selon lequel
    dans une conduite de gaz d'échappement (16) du moteur à combustion interne (10) est monté un catalyseur-accumulateur de réduction de NOx (18),
    qui adsorbe le NOx pendant une phase d'accumulation, lorsque le moteur à combustion interne (10) fonctionne avec un mélange air/carburant pauvre,
    qui transforme par catalyse le NOx accumulé, dans une phase de régénération avec un ajout d'agent de régénération,
    un capteur de NOx (21) est monté en aval du catalyseur-accumulateur de réduction de NOx (18),
    la valeur de concentration brute en NOx (RK) est enregistrée en fonction de paramètres de fonctionnement du moteur à combustion interne (10) dans un diagramme caractéristique (KF1) d'un dispositif de mémorisation (24) d'un dispositif de contrôle (23) contrôlant le moteur à combustion interne (10),
       caractérisé en ce que
       la valeur de concentration brute en NOx (RK) lue dans le diagramme caractéristique (KF1) pendant le fonctionnement du moteur à combustion interne (10) est adaptée sur la base du signal de sortie du capteur de NOx (21) pendant un cycle composé de la phase d'accumulation et de la phase de régénération.
  2. Procédé selon la revendication 1, caractérisé en ce que l'adaptation de la valeur de concentration brute en NOx (RK) est produite par modification d'un facteur de réduction (RF) dont est affectée la valeur de concentration brute en NOx (RK) et qui tient compte d'une concentration de transformation permanente (SK) qui est convertie par le catalyseur-accumulateur de réduction de NOx (18) lors du fonctionnement avec un mélange pauvre du moteur à combustion interne (10).
  3. Procédé selon la revendication 2, caractérisé en ce que
    une quantité échappée (DB) est obtenue pendant la phase pauvre en mesurant la concentration en NOx (NK) en aval du catalyseur-accumulateur de réduction de NOx (18) au moyen du capteur de NOx (21) en l'intégrant sur la durée de la phase pauvre,
    une quantité accumulée (SM) pendant la phase pauvre est calculée pendant la phase riche suivant la phase pauvre,
    sur la base de la valeur de concentration brute en NOx (RK) et du facteur de réduction (RF), l'intégrale de la concentration en NOx corrigée pendant la phase pauvre (IKK) est calculée,
    la somme de la quantité échappée (DB) et de la quantité accumulée (SM), ainsi que la valeur intégrale de la concentration en NOx corrigée pendant la phase pauvre (IKK) sont mises en rapport ((DB+SM) / IKK),
    selon la valeur du rapport, un facteur de correction (RFKF) du facteur de réduction (RF) est modifié ou reste inchangé,
    le facteur de réduction (RF) est multiplié par le facteur de correction (RFKF).
  4. Procédé selon la revendication 3, caractérisé en ce qu'à partir du facteur de réduction adapté (RF) est calculée la concentration brute en NOx corrigée (KK) comme le produit de la différence de 1 et du facteur de réduction adapté (RF) et de la concentration brute en NOx (RK) lue dans le diagramme caractéristique (KF1).
  5. Procédé selon la revendication 1, caractérisé en ce que l'adaptation de la valeur de concentration brute en NOx (RK) est produite par modification d'un facteur de correction réduction (RKKF) par lequel est multipliée directement la valeur de concentration brute en NOx (RK) lue dans le diagramme caractéristique (KF1) et qu'est ainsi obtenue une valeur pré-corrigée de la concentration brute en NOx (RKK).
  6. Procédé selon la revendication 5, caractérisé en ce que
    une quantité échappée (DB) est obtenue pendant la phase pauvre en mesurant la concentration en NOx (NK) en aval du catalyseur-accumulateur de réduction de NOx (18) au moyen du capteur de NOx (21) en l'intégrant sur la durée de la phase pauvre,
    une quantité accumulée (SM) pendant la phase pauvre est calculée pendant la phase riche suivant la phase pauvre,
    sur la base de la valeur de concentration brute en NOx (RK) et du facteur de réduction (RF), l'intégrale de la concentration en NOx corrigée pendant la phase pauvre (IKK) est calculée,
    la somme de la quantité échappée (DB) et de la quantité accumulée (SM), ainsi que la valeur intégrale de la concentration en NOx corrigée pendant la phase pauvre (IKK) sont mises en rapport ((DB+SM) / IKK),
    selon la valeur du rapport, le facteur de correction (RKKF) de la valeur de concentration brute en NOx (RK) est modifié ou reste inchangé.
  7. Procédé selon la revendication 6, caractérisé en ce qu'à partir de la valeur pré-corrigée de la concentration brute en NOx (RKK) est calculée la concentration brute en NOx corrigée (KK) comme le produit de la différence de 1 et du facteur de réduction (RF) et de la concentration brute en NOx pré-corrigée (RKK).
  8. Procédé selon une des revendications 2, 3 ou 7, caractérisé en ce que le facteur de réduction (RF) est enregistré dans un diagramme caractéristique (KF2) en fonction de la température du catalyseur-accumulateur de réduction de NOx (18).
EP99962044A 1998-11-09 1999-11-03 PROCEDE POUR ADAPTER LA CONCENTRATION BRUTE EN NOx D'UN MOTEUR A COMBUSTION INTERNE FONCTIONNANT AVEC UN EXCEDENT D'AIR Expired - Lifetime EP1131549B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19851477 1998-11-09
DE19851477 1998-11-09
PCT/DE1999/003519 WO2000028201A1 (fr) 1998-11-09 1999-11-03 PROCEDE POUR ADAPTER LA CONCENTRATION BRUTE EN NOx D'UN MOTEUR A COMBUSTION INTERNE FONCTIONNANT AVEC UN EXCEDENT D'AIR

Publications (2)

Publication Number Publication Date
EP1131549A1 EP1131549A1 (fr) 2001-09-12
EP1131549B1 true EP1131549B1 (fr) 2004-07-21

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Country Link
US (1) US6438947B2 (fr)
EP (1) EP1131549B1 (fr)
JP (1) JP3531867B2 (fr)
DE (1) DE59910023D1 (fr)
WO (1) WO2000028201A1 (fr)

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JP6025606B2 (ja) * 2013-02-22 2016-11-16 三菱重工業株式会社 燃料セタン価推定方法及び装置
FR3006372B1 (fr) * 2013-05-31 2017-02-24 Renault Sa Procede d'estimation des emissions polluantes d'un moteur a combustion interne et procede associe de pilotage du moteur
FR3016924B1 (fr) * 2014-01-30 2018-10-26 Psa Automobiles Sa. Procede de correction d'un modele d'estimation d'une quantite d'oxydes d'azotes en amont d'un systeme de reduction catalytique selective
SE540265C2 (sv) 2014-01-31 2018-05-15 Scania Cv Ab Förfarande och system vid tillförsel av tillsatsmedel till en avgasström
JP6477088B2 (ja) 2015-03-20 2019-03-06 いすゞ自動車株式会社 ＮＯｘ吸蔵量推定装置
KR101734710B1 (ko) * 2015-12-07 2017-05-11 현대자동차주식회사 차량의 주행패턴 분석방법을 이용한 연비향상방법
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US20010032457A1 (en) 2001-10-25
JP2002529652A (ja) 2002-09-10
EP1131549A1 (fr) 2001-09-12
US6438947B2 (en) 2002-08-27
JP3531867B2 (ja) 2004-05-31
WO2000028201A1 (fr) 2000-05-18
DE59910023D1 (de) 2004-08-26

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