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EP1950396A1 - Method and system for limiting the temperature at the exhaust of a diesel engine - Google Patents

Method and system for limiting the temperature at the exhaust of a diesel engine Download PDF

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Publication number
EP1950396A1
EP1950396A1 EP08150236A EP08150236A EP1950396A1 EP 1950396 A1 EP1950396 A1 EP 1950396A1 EP 08150236 A EP08150236 A EP 08150236A EP 08150236 A EP08150236 A EP 08150236A EP 1950396 A1 EP1950396 A1 EP 1950396A1
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EP
European Patent Office
Prior art keywords
maximum
richness
exhaust
engine
wealth
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.)
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Application number
EP08150236A
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German (de)
French (fr)
Inventor
Fayçal Souidi
Pierre-Olivier Calendini
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PSA Automobiles SA
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Peugeot Citroen Automobiles SA
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Publication date
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Publication of EP1950396A1 publication Critical patent/EP1950396A1/en
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    • 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
    • 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
    • F02D41/1454—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 oxygen content or concentration or the air-fuel ratio
    • 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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2048—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit said control involving a limitation, e.g. applying current or voltage limits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/32—Air-fuel ratio control in a diesel engine

Definitions

  • the present invention relates to a method for limiting the exhaust temperature of a diesel engine, as well as to a system implementing such a method.
  • the exhaust temperature of thermal combustion engines is subject to multiple constraints, including a maximum value not to be exceeded. This threshold value is determined mainly from the maximum thermal stresses allowed by the components arranged on the exhaust line (catalyst, turbocharger turbine ...)
  • the engine richness influences the exhaust temperature, especially when the engine is fully loaded.
  • Motor richness is defined as the ratio of the air and fuel quantities of the mixture in each cylinder.
  • the richness is a value generally between 0.2 and 0.8 on a diesel engine, the value 1 corresponding to the stoichiometric mixture for which the quantity of oxygen contained in the air / fuel mixture is exactly equal to that required for the complete oxidation of the fuel. .
  • the figure 1 shows the exhaust temperature distribution at full load for different engines of the same type, with a fuel flow rate setting at full rated load identical for all. It can be seen that, despite this identical setting, the temperature at the exhaust varies according to the engines in rather large proportions (close to 60 ° C in the example). The distribution of these temperatures follows a distribution of Gaussian type and one can see in this figure the margin of safety between the nominal adjustment (T ref ) and the maximum temperature really admissible by the motors (T max ). Currently, this margin may be greater than 30 ° C.
  • the present invention overcomes this disadvantage, by proposing a method of limiting the exhaust temperature at full load, to reduce the margin required on the maximum exhaust temperature and thus to increase the engine performance.
  • the figure 2 shows the relationship between the exhaust temperature of an engine and the richness of the mixture admitted in the cylinders, in the case where the engine is fully loaded at a regime of 4000 rpm. In such a case, the relationship between these two quantities is quasi-linear. Thus, if we know precisely the slope of the line represented in figure 2 the wealth value corresponding to a given temperature value is easily determined. Therefore, it is sufficient to know the maximum temperature allowable to the exhaust to determine the corresponding maximum wealth.
  • the limitation is implemented only when the motor is fully loaded.
  • the limitation is implemented only when the motor is in a determined speed range.
  • the correction of the fuel flow setpoint is determined by means of a PID type regulator.
  • a safety margin is applied to the fuel flow setpoint to take into account the measurement error of the oxygen sensor.
  • the engine is supercharged, in particular turbocharged.
  • the maximum richness is between 0.7 and 0.8.
  • the invention also relates to a control system of a diesel engine, implementing the method defined above.
  • the figure 3 represents a simplified diagram of the implementation of the method according to the invention: from the maximum temperature allowable to the exhaust is determined by mapping according to the particular load and engine speed a maximum allowable value of wealth.
  • the diagram of the figure 2 shows, under full load conditions and at a speed of 4000 rpm, how wealth is determined maximum permissible from the maximum permissible temperature.
  • the oxygen concentration of the exhaust gas is then measured by means of an oxygen sensor placed on the exhaust line. Indeed, the signal of such a probe is proportional to the oxygen content of the gas, and the knowledge of this magnitude can be traced back to the value of wealth. It is thus easy to deduce the richness of the mixture admitted into the cylinders.
  • the measured richness is then compared with the maximum setpoint richness, and, in the case where it is greater than the latter, corrective action is taken by limiting the injected fuel flow: the richness is thus reduced and, by consequently, the temperature at the exhaust.
  • the engine control strategy thus implemented makes it possible to limit the safety margin on the temperature at the exhaust, and consequently the resulting performance penalty, since the "nominal" engine is adjusted so as to respect the richness of the engine.
  • maximum permissible temperature corresponding to the maximum permissible exhaust temperature.
  • the oxygen sensor detects the difference in richness. which will cause a change in the amount of fuel injected (and therefore wealth) to bring the wealth to the maximum level allowed.
  • the figure 4 is a detailed diagram of the regulation implemented by the method according to the invention.
  • a maximum Rimax_cons setpoint richness is mapped according to the N regime and the injected fuel flow Qinj, then compared to the richness measured by the oxygen probe Ri_mes: on the power point (4000 rpm full load), the values typical maximum setpoint richness are in the range of 0.7 to 0.8.
  • the gap ⁇ between the maximum wealth Rimax_cons and the measured wealth Ri_mes feeds a regulator, for example of the PID (proportional integral derivative) type, which makes it possible to calculate a correction Qinj_PC_corr to be applied to the fuel flow injected at full load Qinj_PC in order to respect the criterion of maximum wealth.
  • the output of the regulator is limited to avoid certain inconveniences (torque, ).
  • This structure is adapted to an engine control structure in (speed, injected flow) but is easily transposable to a structure (speed, torque).
  • the figure 5 shows a curve representing the evolution of the relative accuracy of a conventional oxygen probe as a function of the measured richness.
  • the level of wealth on supercharged diesel engine can reach 0.7 to 0.8, which corresponds to the area where the oxygen sensor has the best accuracy.
  • the level of residual inaccuracy (2 to 3%) may be taken into account when choosing the maximum allowable wealth according to the scheme represented in figure 6 , which allows to reserve a margin of error for the value of maximum wealth.
  • the chosen value is slightly below the real value to take account of the measurement inaccuracy of the oxygen sensor.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The method involves elaborating a maximum admissible temperature setpoint at an exhaust of an oil engine, and determining a maximum richness (Rimax-cons) corresponding to the temperature setpoint by a cartography. A richness (Ri-mes) is measured from oxygen concentration of an exhaust gas by using an oxygen sensor. A gap is calculated between the maximum richness and the measured richness. A correction (Qinj-PC-corr) is applied on a fuel flow setpoint (Qinj-PC) of the engine if the measured richness is higher than the determined maximum richness.

Description

La présente invention est relative à un procédé de limitation de la température à l'échappement d'un moteur diesel, ainsi qu'à un système mettant en oeuvre un tel procédé.The present invention relates to a method for limiting the exhaust temperature of a diesel engine, as well as to a system implementing such a method.

La température à l'échappement des moteurs à combustion thermique est l'objet de multiples contraintes, dont notamment une valeur maximale à ne pas dépasser. Cette valeur seuil est déterminée principalement à partir des contraintes thermiques maximum admissibles par les composants disposés sur la ligne d'échappement (catalyseur, turbine de turbocompresseur...)The exhaust temperature of thermal combustion engines is subject to multiple constraints, including a maximum value not to be exceeded. This threshold value is determined mainly from the maximum thermal stresses allowed by the components arranged on the exhaust line (catalyst, turbocharger turbine ...)

Il est connu que la richesse moteur, ou richesse du mélange, influe sur la température à l'échappement, particulièrement lorsque le moteur est en pleine charge. La richesse moteur est définie comme le rapport entre les quantités d'air et de carburant du mélange dans chaque cylindre. La richesse est une valeur généralement comprise entre 0.2 et 0.8 sur un moteur diesel, la valeur 1 correspondant au mélange stoechiométrique pour lequel la quantité d'oxygène contenue dans le mélange air/carburant est exactement égale à celle nécessaire à l'oxydation complète du carburant.It is known that the engine richness, or richness of the mixture, influences the exhaust temperature, especially when the engine is fully loaded. Motor richness is defined as the ratio of the air and fuel quantities of the mixture in each cylinder. The richness is a value generally between 0.2 and 0.8 on a diesel engine, the value 1 corresponding to the stoichiometric mixture for which the quantity of oxygen contained in the air / fuel mixture is exactly equal to that required for the complete oxidation of the fuel. .

Actuellement, sur les moteurs de série, le réglage du débit de carburant injecté en pleine charge, qui permet de faire varier la richesse en pleine charge, est réalisé sur un moteur nominal lors de la phase de mise au point et appliqué de manière identique sur chaque moteur d'un même modèle. Ceci pose le problème de la prise en compte des multiples dispersions qui apparaissent d'un moteur à l'autre en fonction de la fabrication, de l'usure... Le réglage nominal du débit de carburant doit en conséquent intégrer une marge de sécurité pour prendre en compte ces dispersions et/ou dérives potentielles.Currently, on the series engines, the adjustment of the fuel flow injected at full load, which makes it possible to vary the richness at full load, is carried out on a nominal engine during the development phase and applied in the same way on each engine of the same model. This poses the problem of taking into account the multiple dispersions that appear from one engine to another depending on the manufacturing, the wear ... The nominal setting of the fuel flow must therefore incorporate a safety margin to take into account these dispersions and / or potential drifts.

A titre d'exemple, la figure 1 montre la répartition des températures à l'échappement en pleine charge pour différents moteurs d'un même type, avec un réglage de débit de carburant à pleine charge nominal identique pour tous. On voit que, malgré ce réglage identique, la température à l'échappement varie selon les moteurs dans des proportions assez larges (près de 60°C dans l'exemple). La répartition de ces températures suit une répartition de type gaussien et l'on peut voir sur cette figure la marge de sécurité entre le réglage nominal (Tref) et la température maximale réellement admissible par les moteurs (Tmax). Actuellement, cette marge peut être supérieure à 30°C.For example, the figure 1 shows the exhaust temperature distribution at full load for different engines of the same type, with a fuel flow rate setting at full rated load identical for all. It can be seen that, despite this identical setting, the temperature at the exhaust varies according to the engines in rather large proportions (close to 60 ° C in the example). The distribution of these temperatures follows a distribution of Gaussian type and one can see in this figure the margin of safety between the nominal adjustment (T ref ) and the maximum temperature really admissible by the motors (T max ). Currently, this margin may be greater than 30 ° C.

L'inconvénient de définir ainsi une marge de sécurité importante par rapport à la température maximum admissible est la baisse de rendement du moteur qu'elle induit : on dégrade volontairement la performance du moteur nominal pour s'assurer que l'ensemble des moteurs satisferont bien à la condition de température maximum admissible à l'échappement.The disadvantage of thus defining a large margin of safety with respect to the maximum permissible temperature is the decrease in engine efficiency that it induces: it deliberately degrades the performance of the nominal engine to ensure that all the engines will satisfy at the maximum permissible exhaust temperature condition.

La présente invention remédie à cet inconvénient, en proposant un procédé de limitation de la température à l'échappement à pleine charge, permettant de réduire la marge requise sur la température maximum à l'échappement et donc d'augmenter les performances moteur.The present invention overcomes this disadvantage, by proposing a method of limiting the exhaust temperature at full load, to reduce the margin required on the maximum exhaust temperature and thus to increase the engine performance.

La figure 2 montre la relation entre la température à l'échappement d'un moteur et la richesse du mélange admis dans les cylindres, dans le cas où le moteur est en pleine charge à un régime de 4000 tr/min. Dans un tel cas, la relation entre ces deux grandeurs est quasi-linéaire. Ainsi, si l'on connaît précisément la pente de la droite représentée à la figure 2, on détermine facilement la valeur de richesse correspondant à une valeur de température donnée. Par conséquent, il suffit de connaître la température maximum admissible à l'échappement pour déterminer la richesse maximale correspondante.The figure 2 shows the relationship between the exhaust temperature of an engine and the richness of the mixture admitted in the cylinders, in the case where the engine is fully loaded at a regime of 4000 rpm. In such a case, the relationship between these two quantities is quasi-linear. Thus, if we know precisely the slope of the line represented in figure 2 the wealth value corresponding to a given temperature value is easily determined. Therefore, it is sufficient to know the maximum temperature allowable to the exhaust to determine the corresponding maximum wealth.

Ainsi, l'invention concerne un procédé de limitation de la température à l'échappement d'un moteur diesel, comprenant les étapes suivantes :

  • élaboration d'une consigne de température maximum admissible à l'échappement,
  • détermination par cartographie de la richesse maximale correspondant à la température maximum admissible à l'échappement,
  • mesure de la richesse à partir de la concentration en oxygène des gaz d'échappement au moyen d'une sonde à oxygène,
  • calcul de l'écart entre la richesse maximale et la richesse mesurée,
  • application d'une correction sur la consigne de débit de carburant du moteur si la richesse mesurée est supérieure à la richesse maximale déterminée.
Thus, the invention relates to a method for limiting the temperature at the exhaust of a diesel engine, comprising the following steps:
  • development of a maximum temperature setpoint admissible to the exhaust,
  • determination by mapping of the maximum richness corresponding to the maximum permissible temperature at the exhaust,
  • measuring the richness from the oxygen concentration of the exhaust gases by means of an oxygen sensor,
  • calculating the difference between the maximum wealth and the measured wealth,
  • applying a correction on the motor fuel flow setpoint if the measured wealth is greater than the determined maximum wealth.

Dans une réalisation, la limitation n'est mise en oeuvre que lorsque le moteur est en pleine charge.In one embodiment, the limitation is implemented only when the motor is fully loaded.

Dans une réalisation, la limitation n'est mise en oeuvre que lorsque le moteur se situe dans une plage de régime déterminée.In one embodiment, the limitation is implemented only when the motor is in a determined speed range.

Dans une réalisation, la correction de la consigne de débit de carburant est déterminée au moyen d'un régulateur de type PID.In one embodiment, the correction of the fuel flow setpoint is determined by means of a PID type regulator.

Dans une réalisation, on applique une marge de sécurité sur la consigne de débit de carburant pour prendre en compte l'erreur de mesure de la sonde à oxygène.In one embodiment, a safety margin is applied to the fuel flow setpoint to take into account the measurement error of the oxygen sensor.

Dans une réalisation, le moteur est suralimenté, notamment turbocompressé.In one embodiment, the engine is supercharged, in particular turbocharged.

Dans une réalisation, la richesse maximale est comprise entre 0,7 et à 0,8.In one embodiment, the maximum richness is between 0.7 and 0.8.

L'invention concerne également un système de commande d'un moteur diesel, mettant en oeuvre le procédé défini ci-dessus.The invention also relates to a control system of a diesel engine, implementing the method defined above.

L'invention sera mieux comprise grâce à la description détaillée d'un exemple de réalisation, faite en référence aux figures parmi lesquelles :

  • la figure 1, déjà décrite, représente la répartition des températures à l'échappement sur une population de moteurs identiques de l'art antérieur,
  • la figure 2, déjà décrite, est une courbe qui représente l'évolution de la température à l'échappement en fonction de la richesse, lors que le moteur est en pleine charge à un régime de 4000 tours par minute,
  • la figure 3 est un schéma simplifié de la mise en oeuvre du procédé selon l'invention,
  • la figure 4 représente un schéma détaillé de la régulation mise en oeuvre par le procédé selon l'invention,
  • la figure 5 représente la précision de la mesure d'une sonde à oxygène en fonction de la richesse,
  • la figure 6 est un diagramme qui permet de déterminer la richesse maximale lorsque l'on tient compte de l'erreur de mesure de la sonde à oxygène.
The invention will be better understood thanks to the detailed description of an exemplary embodiment, with reference to the figures among which:
  • the figure 1 , already described, represents the distribution of exhaust temperatures on a population of identical engines of the prior art,
  • the figure 2 , already described, is a curve which represents the evolution of the exhaust temperature as a function of the richness, when the engine is fully loaded at a speed of 4000 revolutions per minute,
  • the figure 3 is a simplified diagram of the implementation of the method according to the invention,
  • the figure 4 represents a detailed diagram of the regulation implemented by the method according to the invention,
  • the figure 5 represents the precision of the measurement of an oxygen probe as a function of the richness,
  • the figure 6 is a diagram that determines the maximum richness when the measurement error of the oxygen sensor is taken into account.

L'invention va maintenant être décrite en relation avec les figures 2, 3, 4, 5 et 6.The invention will now be described in connection with the figures 2 , 3 , 4 , 5 and 6 .

La figure 3 représente un schéma simplifié de la mise en oeuvre du procédé selon l'invention: à partir de la consigne de température maximum admissible à l'échappement est déterminée par cartographie en fonction notamment de la charge et du régime moteur une consigne de richesse maximum admissible. Le diagramme de la figure 2 montre, dans les conditions de pleine charge et au régime de 4000 tr/min, comment l'on détermine la richesse maximale admissible à partir de la température maximale admissible.The figure 3 represents a simplified diagram of the implementation of the method according to the invention: from the maximum temperature allowable to the exhaust is determined by mapping according to the particular load and engine speed a maximum allowable value of wealth. The diagram of the figure 2 shows, under full load conditions and at a speed of 4000 rpm, how wealth is determined maximum permissible from the maximum permissible temperature.

On mesure ensuite grâce à une sonde à oxygène disposée sur la ligne d'échappement, sur le parcours des gaz d'échappement, la concentration en oxygène de ces derniers. En effet, le signal d'une telle sonde est proportionnel à la teneur en oxygène des gaz, et la connaissance de cette grandeur permet de remonter à la valeur de la richesse. On peut ainsi déduire facilement la richesse du mélange admis dans les cylindres.The oxygen concentration of the exhaust gas is then measured by means of an oxygen sensor placed on the exhaust line. Indeed, the signal of such a probe is proportional to the oxygen content of the gas, and the knowledge of this magnitude can be traced back to the value of wealth. It is thus easy to deduce the richness of the mixture admitted into the cylinders.

La richesse mesurée est ensuite comparée à la richesse maximale de consigne, et, dans le cas où elle est supérieure à cette dernière, on effectue une action corrective en limitant le débit de carburant injecté : on diminue de cette manière la richesse et, par voie de conséquence, la température à l'échappement.The measured richness is then compared with the maximum setpoint richness, and, in the case where it is greater than the latter, corrective action is taken by limiting the injected fuel flow: the richness is thus reduced and, by consequently, the temperature at the exhaust.

La stratégie de contrôle du moteur ainsi mise en oeuvre permet de limiter la marge de sécurité sur la température à l'échappement, et par conséquent la pénalité en performance qui en découle, puisque le moteur « nominal » est réglé de sorte à respecter la richesse maximum admissible correspondant à la température à l'échappement maximum admissible. En cas de dispersion et/ou de dérive, par exemple due à l'injection ou à la boucle d'air, conduisant à un dépassement de la température à l'échappement maximum, la sonde à oxygène détecte l'écart de richesse, ce qui va entraîner une modification de la quantité de carburant injectée (et donc de la richesse) afin de ramener la richesse au niveau maximal autorisé.The engine control strategy thus implemented makes it possible to limit the safety margin on the temperature at the exhaust, and consequently the resulting performance penalty, since the "nominal" engine is adjusted so as to respect the richness of the engine. maximum permissible temperature corresponding to the maximum permissible exhaust temperature. In case of dispersion and / or drift, for example due to the injection or the air loop, leading to exceeding the maximum exhaust temperature, the oxygen sensor detects the difference in richness. which will cause a change in the amount of fuel injected (and therefore wealth) to bring the wealth to the maximum level allowed.

La figure 4 est un schéma détaillé de la régulation mise en oeuvre par le procédé selon l'invention. Une richesse maximale de consigne Rimax_cons est cartographiée en fonction du régime N et du débit de carburant injecté Qinj, puis comparée à la richesse mesurée par la sonde à oxygène Ri_mes : sur le point de puissance (4000 tr/min pleine charge), les valeurs typiques de la richesse maximale de consigne sont de l'ordre de 0,7 à 0,8. L'écart · entre la richesse maximale Rimax_cons et la richesse mesurée Ri_mes alimente un régulateur, par exemple de type PID (proportionnel intégral dérivé), qui permet de calculer une correction Qinj_PC_corr à apporter au débit de carburant injecté en pleine charge Qinj_PC afin de respecter le critère de richesse maximum. Il est à noter que la sortie du régulateur est limitée pour éviter certains désagréments (couple,...). Cette structure est adaptée à une structure de contrôle moteur en (régime, débit injecté) mais est aisément transposable à une structure (régime, couple).The figure 4 is a detailed diagram of the regulation implemented by the method according to the invention. A maximum Rimax_cons setpoint richness is mapped according to the N regime and the injected fuel flow Qinj, then compared to the richness measured by the oxygen probe Ri_mes: on the power point (4000 rpm full load), the values typical maximum setpoint richness are in the range of 0.7 to 0.8. The gap · between the maximum wealth Rimax_cons and the measured wealth Ri_mes feeds a regulator, for example of the PID (proportional integral derivative) type, which makes it possible to calculate a correction Qinj_PC_corr to be applied to the fuel flow injected at full load Qinj_PC in order to respect the criterion of maximum wealth. It should be noted that the output of the regulator is limited to avoid certain inconveniences (torque, ...). This structure is adapted to an engine control structure in (speed, injected flow) but is easily transposable to a structure (speed, torque).

La figure 5 montre une courbe représentant l'évolution de la précision relative d'une sonde à oxygène conventionnelle en fonction de la richesse mesurée. En pleine charge, le niveau de richesse sur moteur diesel suralimenté peut atteindre 0.7 à 0.8 , ce qui correspond à la zone où la sonde à oxygène présente la meilleure précision. Néanmoins, le niveau d'imprécision résiduelle (2 à 3 %) pourra être pris en compte lors du choix de la richesse maximum admissible selon le schéma représenté à la figure 6, qui permet de réserver une marge d'erreur pour la valeur de richesse maximale. Ainsi la valeur choisie est légèrement en deçà de la valeur réelle pour tenir compte de l'imprécision de mesure de la sonde à oxygène.The figure 5 shows a curve representing the evolution of the relative accuracy of a conventional oxygen probe as a function of the measured richness. At full load, the level of wealth on supercharged diesel engine can reach 0.7 to 0.8, which corresponds to the area where the oxygen sensor has the best accuracy. Nevertheless, the level of residual inaccuracy (2 to 3%) may be taken into account when choosing the maximum allowable wealth according to the scheme represented in figure 6 , which allows to reserve a margin of error for the value of maximum wealth. Thus, the chosen value is slightly below the real value to take account of the measurement inaccuracy of the oxygen sensor.

Claims (8)

Procédé de limitation de la température à l'échappement d'un moteur diesel, comprenant les étapes suivantes : - élaboration d'une consigne de température maximum admissible à l'échappement, - détermination par cartographie de la richesse maximale (Rimax_cons) correspondant à la température maximum admissible à l'échappement, - mesure de la richesse (Ri_mes) à partir de la concentration en oxygène des gaz d'échappement, au moyen d'une sonde à oxygène, - calcul de l'écart · entre la richesse maximale (Rimax_cons) et la richesse mesurée (Ri_mes), - application d'une correction (Qinj_PC_corr) sur la consigne de débit de carburant (Qinj_PC) du moteur si la richesse mesurée (Ri_mes) est supérieure à la richesse maximale déterminée. A method for limiting the exhaust temperature of a diesel engine, comprising the steps of: - development of a maximum temperature setpoint admissible to the exhaust, determination by mapping of the maximum richness (Rimax_cons) corresponding to the maximum permissible temperature at the exhaust, measurement of the richness (Ri_mes) from the oxygen concentration of the exhaust gases, by means of an oxygen probe, calculating the difference between the maximum wealth (Rimax_cons) and the measured wealth (Ri_mes), - Application of a correction (Qinj_PC_corr) on the fuel flow setpoint (Qinj_PC) of the engine if the measured wealth (Ri_mes) is greater than the maximum wealth determined. Procédé selon la revendication 1, dans lequel la limitation n'est mise en oeuvre que lorsque le moteur est en pleine charge.The method of claim 1, wherein the limitation is implemented only when the engine is fully loaded. Procédé selon la revendication 1 ou 2, dans lequel la limitation n'est mise en oeuvre que lorsque le moteur se situe dans une plage de régime déterminée.Method according to claim 1 or 2, wherein the limitation is implemented only when the motor is in a determined speed range. Procédé selon l'une des revendications 1 à 3, dans lequel la correction (Qinj_PC_corr) de la consigne de débit de carburant (Qinj_PC) est déterminée au moyen d'un régulateur de type PID.Method according to one of claims 1 to 3, wherein the correction (Qinj_PC_corr) of the fuel flow setpoint (Qinj_PC) is determined by means of a PID type regulator. Procédé selon l'une des revendications 1 à 4, dans lequel on applique une marge de sécurité sur la consigne de débit de carburant (Qinj_PC) pour prendre en compte l'erreur de mesure de la sonde à oxygène.Method according to one of claims 1 to 4, wherein a safety margin is applied on the fuel flow setpoint (Qinj_PC) to take into account the measurement error of the oxygen sensor. Procédé selon l'une des revendications 1 à 5, dans lequel le moteur est suralimenté, notamment turbocompressé.Method according to one of claims 1 to 5, wherein the engine is supercharged, including turbocharged. Procédé selon l'une des revendications 1 à 6, dans lequel la richesse maximale (Rimax_cons) est comprise entre 0,7 et à 0,8.Method according to one of claims 1 to 6, wherein the maximum wealth (Rimax_cons) is between 0.7 and 0.8. Système de commande d'un moteur diesel mettant en oeuvre le procédé selon l'une des revendications 1 à 7.Control system for a diesel engine implementing the method according to one of claims 1 to 7.
EP08150236A 2007-01-25 2008-01-14 Method and system for limiting the temperature at the exhaust of a diesel engine Withdrawn EP1950396A1 (en)

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FR0752893A FR2911920B1 (en) 2007-01-25 2007-01-25 METHOD AND SYSTEM FOR LIMITING THE EXHAUST TEMPERATURE OF A DIESEL ENGINE.

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