EP1180594B1 - Procédé pour tester un système de recirculation de gaz d'échappement - Google Patents

Procédé pour tester un système de recirculation de gaz d'échappement Download PDF

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Publication number
EP1180594B1
EP1180594B1 EP01118459A EP01118459A EP1180594B1 EP 1180594 B1 EP1180594 B1 EP 1180594B1 EP 01118459 A EP01118459 A EP 01118459A EP 01118459 A EP01118459 A EP 01118459A EP 1180594 B1 EP1180594 B1 EP 1180594B1
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EP
European Patent Office
Prior art keywords
exhaust gas
gas recirculation
recirculation rate
nox concentration
internal combustion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01118459A
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German (de)
English (en)
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EP1180594A3 (fr
EP1180594A2 (fr
Inventor
Wolfgang Ludwig
Corinna Pfleger
Hong Dr. Zhang
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Siemens AG
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Siemens AG
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Publication of EP1180594A3 publication Critical patent/EP1180594A3/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/45—Sensors specially adapted for EGR systems
    • F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/49—Detecting, diagnosing or indicating an abnormal function of the EGR system
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • F02D41/0055—Special engine operating conditions, e.g. for regeneration 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
    • F02D41/1444—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/45—Sensors specially adapted for EGR systems
    • F02M26/48—EGR valve position sensors

Definitions

  • the invention relates to a method for checking an exhaust gas recirculation system of an internal combustion engine.
  • exhaust gas recirculation systems In addition to the use of NOx storage catalysts, which are due to their coatings able to absorb NOx compounds from the exhaust gas, which arise during lean combustion, in a storage phase and convert in a regeneration phase with the addition of a reducing agent into harmless compounds are also so-called exhaust gas recirculation systems known. In such exhaust gas recirculation systems, part of the exhaust gas stream is added to the stream of fresh gas flowing into the cylinders. Since exhaust gas for combustion is an inert gas, thereby the NOx raw emissions of the internal combustion engine decreases. The control of the recirculated exhaust gas flow, the so-called exhaust gas recirculation rate, usually takes place via an exhaust gas recirculation valve connected in the return line.
  • Such an exhaust gas recirculation system is an emission-relevant component.
  • Such components are subject to review due to current or future regulations in the operation of an internal combustion engine, as a failure or incorrect operation of the exhaust gas recirculation system could drastically degrade the emission behavior of an internal combustion engine and could lead to exceeding predetermined limits.
  • the exhaust gas recirculation valve via which the exhaust gas recirculation rate is set.
  • the intake air mass is determined via an air mass meter. From the intake air mass can be calculated at a certain position of the exhaust gas recirculation valve expected intake manifold downstream of a throttle valve of an internal combustion engine. If there is a difference between the measured and calculated intake manifold pressure, a faulty exhaust gas recirculation valve is diagnosed. This principle is described for example in DE 44 06 281 A1.
  • the document JP 63 263 258 A describes a diagnostic device for an exhaust gas recirculation device of an internal combustion engine.
  • an exhaust gas recirculation valve is closed. In an intact exhaust gas recirculation, this leads to an increased proportion of fresh air in the exhaust gases, which is measured by means of an O2 sensor. If such a proportion of fresh air is not detected in the exhaust gases, it is concluded that an error has occurred in the exhaust gas recirculation system. With this device can be determined that the exhaust gas recirculation valve does not close properly, an error with respect to a no longer opening exhaust gas recirculation valve can not be determined.
  • the invention has for its object to provide a method for checking an exhaust gas recirculation system, in which no pressure measurement in the intake manifold is required.
  • the invention makes use of the knowledge that changes in the exhaust gas recirculation rate can greatly influence the NOx emissions of an internal combustion engine. If the exhaust gas recirculation rate is changed by a certain amount, it is possible to detect a faulty exhaust gas recirculation system due to a lack of the anticipated change in the NOx emission of the internal combustion engine. This concept is suitable for all equipped with exhaust gas recirculation systems internal combustion engines.
  • This check is particularly easy to perform if the NOx emission of the engine otherwise would be constant, which is the case especially in static operating conditions of the internal combustion engine, especially if so the change over time of load and / or speed of the internal combustion engine below a certain appropriate limit remains.
  • the exhaust gas recirculation system In order to detect a lack of an expected NOx concentration in the exhaust gas of the internal combustion engine, various approaches are conceivable. On the one hand, one can form a concentration difference from the NOx concentration measured in the exhaust gas before and after the change of the exhaust gas recirculation rate. Of course, this concentration difference depends on the change made in the exhaust gas recirculation rate. If an expected concentration difference remains despite a change in the exhaust gas recirculation rate, the exhaust gas recirculation system is defective.
  • the NOx concentration can be measured at any point in the exhaust system, in particular upstream of a catalyst.
  • one of these NOx concentration measurements can also be determined by a model determination replace the NOx raw emissions, which known models can be used, which estimate from operating parameters of the internal combustion engine, the NOx concentration emitted for this operating condition.
  • the concentration difference can be formed together with the measurement of the NOx concentration after the change, and either the model value for the NOx concentration before the EGR rate change or the model value for the operation state after the change of the NOx concentration Use exhaust gas recirculation rate. It is expedient here, however, that otherwise the operating conditions of the internal combustion engine remain largely constant, since then the error in the model determination of the NOx concentration is as low as possible.
  • the internal combustion engine has a NOx storage catalytic converter
  • a NOx concentration sensor for diagnosis, as is conventionally provided for controlling a NOx storage catalytic converter of this catalytic converter.
  • a known arrangement is, for example, a downstream of the catalyst sensor. Since such a NOx storage catalyst but usually absorbs the NOx compounds in the exhaust gas, it must be ensured in this arrangement to carry out the verification that this absorption does not take place temporarily.
  • This can be achieved in a preferred embodiment of the invention in that the catalyst is saturated before the test up to its maximum storage capacity.
  • the saturation state can be achieved with the NOx concentration sensor arranged downstream, for example by comparing a modeled NOx concentration with a measured NOx concentration or by suitable interpretation of the gradient of the NOx concentration downstream of the NOx storage catalytic converter during a storage process.
  • Saturation can be achieved particularly quickly if a high level of raw NOx emission is provided upstream of the NOx storage catalytic converter, for example by setting the exhaust gas recirculation rate below a certain threshold value or particularly preferably close to zero.
  • the exhaust gas recirculation rate is set from a maximum value to a minimum value.
  • the exhaust gas recirculation rate must be increased from the value lying below the minimum value, then subsequently reduced again can be used to form the concentration difference.
  • FIG. 1 shows in the form of a block diagram an Otto internal combustion engine with direct injection, wherein only those components are shown, which are necessary for the understanding of the invention; In particular, the fuel circuit and an exhaust aftertreatment system are not shown.
  • the internal combustion engine of Figure 1 has an intake manifold 1 with an air collector 2, which opens via a suction pipe 3 in a cylinder 6 of the internal combustion engine.
  • an air collector 2 which opens via a suction pipe 3 in a cylinder 6 of the internal combustion engine.
  • a suction pipe 3 for better clarity, only one cylinder 6 is shown; However, the number of cylinders is not important.
  • a control unit 10 injection valve fuel is injected via a controlled by a control unit 10 injection valve.
  • a throttle valve 5 which is actuated by a throttle valve actuator 12, which is also controlled by the control unit 10.
  • an air mass meter 4 is provided upstream of the throttle valve 5 in the intake tract 1.
  • Downstream of the throttle valve 5 opens into the intake 1, an exhaust gas recirculation line 8, on the other hand connected to the exhaust gas tract 7 of the internal combustion engine, in which the combustion gases flow from the cylinder 6.
  • an exhaust gas recirculation line 8 is an exhaust gas recirculation valve 9, which is actuated by an actuator 14, which is controlled by the control unit 10.
  • a bearing feedback is provided, via which the control unit 10 detects the set on the exhaust gas recirculation valve 9 opening degree.
  • crankshaft sensor 13 which senses the rotational speed of the crankshaft 15.
  • NOx sensor 16 which measures the NOx concentration in the exhaust gas flowing through the exhaust tract. Any intended in the exhaust system catalysts, NOx storage or 3-way catalysts are not shown for the sake of clarity.
  • the control unit 10 has a plurality of program modules 11, 17, 19 and 18, which will be discussed later.
  • a first NOx concentration NOx1 is measured. This is done with the aid of the measuring module 11 of the control unit 10, which reads the NOx sensor 16. Subsequently, in a step S2 at the exhaust gas recirculation valve 9, a preset in the memory module 17 change in the exhaust gas recirculation rate is set; This is done by the EGR module 18 of the control unit 10. The change is chosen so that the exhaust gas recirculation rate a predetermined jump from high exhaust gas recirculation rate to small exhaust gas recirculation rate, for example, from a high setpoint to 0%, performs.
  • step S6 After this change in the exhaust gas recirculation rate, the NOx concentration in the exhaust gas of the internal combustion engine is again measured via the NOx sensor 16 and stored as a value NOx2 in the memory module 17 of the control unit 10. This is again done via the measuring module 11 (step S3). Then, in step S4, it is checked whether the difference between NOx1 and NOx2 exceeds a threshold value SW1 likewise stored in the memory module 17. If this is not the case (N branching), an error of the exhaust gas recirculation system (in particular of the exhaust gas recirculation valve 9) is determined in a step S5. Otherwise (J branch), a proper feedback facility is diagnosed in step S6.
  • an NOx concentration determined in a model may also be used.
  • This model determination takes place in the NOx model module 19 of the control unit 10.
  • the NOx model module 19 calculates in a known manner the raw emission of NOx in the exhaust gas of the internal combustion engine.
  • the checking method is performed only when the crankshaft sensor 13 indicates that the speed of the crankshaft 15 and thereby of the internal combustion engine remains within a certain window, preferably constant. The accuracy is further enhanced when, at the same time, the load, i. the indicated by the air mass meter 4, flowing into the engine air mass is constant within certain limits.
  • step S4 takes place between the modeled NOx concentration and the measured NOx concentration NOx2 after the change of the exhaust gas recirculation rate in step S2.
  • the step S1 can be omitted in this modification, since no longer the measured NOx concentration NOx1, but a modeled value in step S4 input.
  • the stored values (SW1, ...) can also be selected depending on the operating parameters.
  • the memory module 17 then contains suitable maps.
  • step S7 the exhaust gas recirculation rate is set to a value below a threshold, in this case to zero.
  • the NOx concentration is measured by means of the NOx sensor 16 and stored in the memory module 17 as the value NOx3.
  • step S9 it is then checked whether the value NOx3 exceeds a threshold value.
  • step S8 a return is made in step S8. Only when the query in step S9 leads to a positive result (J-branch), the NOx storage catalyst is in saturation and it supplied NOx amounts beat to its output. Then, in step S10, the exhaust gas recirculation rate is set to a high value, for example 100%, and the process steps of FIG. 2 follow.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Testing Of Engines (AREA)

Claims (9)

  1. Procédé de vérification d'un système de recyclage des gaz d'échappement d'un moteur à combustion interne recyclant des gaz d'échappement à un taux de recyclage des gaz d'échappement depuis le circuit d'échappement (7) vers le circuit d'admission (1), dans lequel on fixe une certaine modification du taux de recyclage des gaz d'échappement, on mesure la concentration en NOx dans les gaz d'échappement et on constate une défectuosité du système de recyclage des gaz d'échappement en cas d'absence d'une certaine différence de concentration en NOx dépendant de la modification du taux de recyclage des gaz d'échappement.
  2. Procédé selon la revendication 1, caractérisé en ce que la différence de concentration en NOx est déterminée à partir de la concentration en NOx mesurée avant et après la modification du taux de concentration en NOx dans les gaz d'échappement.
  3. Procédé selon la revendication 1, caractérisé en ce que la différence de concentration en NOx est déterminée à partir de la concentration en NOx mesurée après la modification du taux de recyclage des gaz d'échappement dans les gaz d'échappement et d'une concentration en NOx obtenue avec un modèle à partir de paramètres de fonctionnement du moteur à combustion interne pour l'état de fonctionnement du moteur à combustion interne présent avant ou après la modification du taux de recyclage des gaz d'échappement.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la concentration en NOx est mesurée en aval d'un catalyseur d'accumulation de NOx et avant de fixer la modification définie du taux de recyclage des gaz d'échappement du catalyseur d'accumulation de NOx jusqu'à sa capacité d'accumulation maximale.
  5. Procédé selon la revendication 4, caractérisé en ce qu'on reconnaît la saturation à une concentration en NOx prédéterminée en aval du catalyseur.
  6. Procédé selon la revendication 4 ou 5, caractérisé en ce que pour atteindre rapidement la saturation, on place le taux de recyclage des gaz d'échappement en dessous d'une certaine valeur minimale, de préférence proche de zéro.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la modification définie du taux de recyclage des gaz d'échappement est une réduction en forme de rampe ou de palier.
  8. Procédé selon les revendications 6 et 7, caractérisé en ce qu'on augmente de nouveau le taux de recyclage des gaz d'échappement inférieur à une certaine valeur minimale pour atteindre rapidement la saturation puis en le réduisant dans la modification définie.
  9. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la vérification n'est effectuée que si les paramètres de fonctionnement du moteur à combustion interne, en particulier la charge et/ou le régime, se trouvent dans les limites d'un certain domaine et/ou présentent une dynamique limitée.
EP01118459A 2000-08-16 2001-07-31 Procédé pour tester un système de recirculation de gaz d'échappement Expired - Lifetime EP1180594B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10039952 2000-08-16
DE10039952A DE10039952C2 (de) 2000-08-16 2000-08-16 Verfahren zur Überprüfung einer Abgasrückführanlage

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EP1180594A2 EP1180594A2 (fr) 2002-02-20
EP1180594A3 EP1180594A3 (fr) 2003-01-02
EP1180594B1 true EP1180594B1 (fr) 2006-09-06

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DE (2) DE10039952C2 (fr)

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KR20130063946A (ko) * 2011-12-07 2013-06-17 현대자동차주식회사 배기가스 재순환 진단장치 및 배기가스 재순환 진단방법
FR2999646B1 (fr) * 2012-12-18 2017-10-27 Continental Automotive France Procede de determination du debit d'air recycle et de la quantite d'oxygene disponible a l'entree d'un cylindre d'un moteur a combustion interne
CN111780903B (zh) * 2020-06-30 2022-03-15 东风商用车有限公司 蝶片式egr阀电机力矩特性测量装置及测量方法
US11932080B2 (en) 2020-08-20 2024-03-19 Denso International America, Inc. Diagnostic and recirculation control systems and methods
US11636870B2 (en) 2020-08-20 2023-04-25 Denso International America, Inc. Smoking cessation systems and methods
US11760170B2 (en) 2020-08-20 2023-09-19 Denso International America, Inc. Olfaction sensor preservation systems and methods
US11828210B2 (en) 2020-08-20 2023-11-28 Denso International America, Inc. Diagnostic systems and methods of vehicles using olfaction
US11760169B2 (en) 2020-08-20 2023-09-19 Denso International America, Inc. Particulate control systems and methods for olfaction sensors
US11881093B2 (en) 2020-08-20 2024-01-23 Denso International America, Inc. Systems and methods for identifying smoking in vehicles
US11813926B2 (en) 2020-08-20 2023-11-14 Denso International America, Inc. Binding agent and olfaction sensor
CN112539121B (zh) * 2020-11-27 2022-03-01 潍柴动力股份有限公司 一种egr系统的积碳在线检测方法、检测装置及机动车
CN114183260B (zh) * 2021-10-29 2023-05-12 东风商用车有限公司 EGR故障模式下的NOx控制方法

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US6598470B2 (en) 2003-07-29
DE10039952C2 (de) 2003-04-24
DE10039952A1 (de) 2002-02-28
EP1180594A3 (fr) 2003-01-02
DE50110924D1 (de) 2006-10-19
EP1180594A2 (fr) 2002-02-20
US20020033045A1 (en) 2002-03-21

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