EP0908620A1 - Cut-off detection method and device for glow plug Diesel engine of motor vehicle - Google Patents

Cut-off detection method and device for glow plug Diesel engine of motor vehicle Download PDF

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Publication number
EP0908620A1
EP0908620A1 EP98402360A EP98402360A EP0908620A1 EP 0908620 A1 EP0908620 A1 EP 0908620A1 EP 98402360 A EP98402360 A EP 98402360A EP 98402360 A EP98402360 A EP 98402360A EP 0908620 A1 EP0908620 A1 EP 0908620A1
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EP
European Patent Office
Prior art keywords
ratio
kref
currents
kcal
branches
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Granted
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EP98402360A
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German (de)
French (fr)
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EP0908620B1 (en
Inventor
Bernard Ducerf
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Automobiles Peugeot SA
Automobiles Citroen SA
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Automobiles Peugeot SA
Automobiles Citroen SA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
    • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
    • F02P19/027—Safety devices, e.g. for diagnosing the glow plugs or the related circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
    • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
    • F02P19/021—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs characterised by power delivery controls
    • F02P19/023—Individual control of the glow plugs

Definitions

  • the present invention relates to a method and a device for detecting the cutout of a glow plug of a diesel engine of a motor vehicle.
  • the invention relates to the detection of a cut spark plug for a vehicle diesel engine automobile, comprising at least two supply branches at least two glow plugs each.
  • Such a method and such a device are intended for be associated with an electronic pre-postheating control unit.
  • This pre-postheating electronic unit is in makes a power interface that fits into a system for checking the operation of the engine between the computer and the glow plugs of this engine.
  • One of the functions of this box is to put under tension the glow plugs when receiving them the order of the calculator.
  • such a box must detect all the spark plug and relay failures and transmit a status signal, i.e. a diagnostic signal, at calculator for the evaluation of the functioning of the function feeding these candles.
  • a status signal i.e. a diagnostic signal
  • the object of the invention is to propose a method and a device for detecting the cut of a candle preheating of a diesel engine of a motor vehicle which are simple, reliable and easy to implement in such a context.
  • the baseline report is established during an initialization phase of the device at the first supply thereof, by reading the circulating currents in the supply branches during this phase initialization, calculation of the ratio of these currents and storing this report as a baseline report.
  • the predetermined coefficient is equal to 0.7.
  • the invention also has for object a detection device for the implementation of a such process.
  • This case constitutes, as indicated above, a power interface that integrates into the engine operation control system between a injection computer designated by general reference 2 and the glow plugs, designated by the reference general 3 in this figure 1.
  • these candles are distributed in pairs, candles 1 and 2 being associated in a first pair 3a and the candles 3 and 4 being associated in a second pair 3b.
  • Each pair of candles is then powered by via a supply branch respectively 4 and 5, from electronic unit 1.
  • This box receives as input the mass, the most power from the vehicle battery and a signal from command + APC.
  • This box 1 actually includes a power module designated by the general reference 6, a control module candles designated by the general reference 7 and a safety and diagnostic module designated by the reference general 8.
  • the spark plug control module 7 receives a signal by a command line (Co) 9 from injection computer 2, and this computer receives a signal diagnostic by a diagnostic line (Di) 10 emanating from safety and diagnostic module 8.
  • the safety and diagnostic module fulfills several protective functions as previously indicated.
  • it may include a device for detection of the cut-out of a glow plug, one of which exemplary embodiment is illustrated in FIG. 2.
  • the detection device includes means 11 and 12 for measuring currents IB1 and IB2 circulating in branches 4 and 5, respectively, connecting the control module 7 of the power supply candles to them.
  • This current information IB1 and IB2 are then transmitted to a central information processing unit designated by the general reference 13 in Figure 2, which is suitable for calculating a ratio K of these two currents and to deliver this calculated Kcal ratio to means of comparison 14 of it to a Kref reference report, to detect a cut candle if the ratio calculated by unit 13 differs from the baseline by at least one predetermined coefficient S.
  • the corresponding input of the means of comparison receives Kref.S information established by calculation means 15, by multiplying the predetermined coefficient S stored in storage means 16 and Kref report stored in storage means 17.
  • the comparison of this information then makes it possible to detect a cut candle.
  • the Kref reference report can be established during a detection device initialization phase, at the first supply thereof, by calculating the ratio of currents flowing in branches 4 and 5, during this initialization phase and storage thereof.
  • This coefficient constitutes a detection threshold which can for example be equal to 0.7.
  • the processing unit information 13 determines if this is the device first power to determine if the device requires an initialization phase.
  • this information processing unit 13 ensures in 22, the acquisition of the circulating currents in branches 4 and 5 of candle supply, ie for example the currents IB1 and IB2 respectively in branches 4 and 5.
  • This Kref reference report is then stored during from step 24 for example in the storage means 17 described with reference to FIG. 2. This then allows the calculation means 15 described with reference to FIG. 2, to establish the Kref product. x S, S being stored in the means of storage 16 of FIG. 2.
  • the central unit information processing 13 comes up in step 25, the currents flowing in branches 4 and 5, i.e. the currents IB1 and IB2.
  • the calculated Kcal ratio differs from the ratio Kref established during the initialization phase.
  • a detection threshold is then established using at coefficient S.
  • the central information processing unit 13 compares the calculated ratio Kcal to the multiplied reference ratio Kref by the predetermined detection coefficient S to detect a spark plug cut in the event of a match and functioning normal in case of discrepancy,

Abstract

Method for detection of the cut out of a pre-heating glow plug for an automobile diesel engine, having at least two supply branches (4,5) with at least two pre-heating glow plugs each. The method includes the following stages: - measure (25) at each engine start the, the currents (IB1,IB2) in the two branches; - calculate (26) a relationship between these two currents; - compare (27) the calculated relationship (Kcal) with a reference relationship (Kref) so as to detect a non operating glow plug if there is a difference between the two relationships by at least a predetermined coefficient (S). The detector includes a computer (13) and a comparator (14) and has means (16) for storing the coefficient (S) and means (17) for storing the reference (Kref) delivered by the computer (13). The coefficient (S) is equal to 0.7. The comparator (14) receives on an input the relationship (Kcal) and another the reference (Kcal), determined by the computer (15).

Description

La présente invention concerne un procédé et un dispositif de détection de la coupure d'une bougie de préchauffage d'un moteur Diesel de véhicule automobile.The present invention relates to a method and a device for detecting the cutout of a glow plug of a diesel engine of a motor vehicle.

Plus particulièrement, l'invention se rapporte à la détection d'une bougie coupée pour un moteur Diesel de véhicule automobile, comportant au moins deux branches d'alimentation d'au moins deux bougies de préchauffage chacune.More particularly, the invention relates to the detection of a cut spark plug for a vehicle diesel engine automobile, comprising at least two supply branches at least two glow plugs each.

Un tel procédé et un tel dispositif sont destinés à être associés à un boítier électronique de commande de pré-postchauffage.Such a method and such a device are intended for be associated with an electronic pre-postheating control unit.

Ce boítier électronique de pré-postchauffage est en fait une interface de puissance qui s'intègre dans un système de contrôle du fonctionnement du moteur entre le calculateur d'injection et les bougies de préchauffage de ce moteur.This pre-postheating electronic unit is in makes a power interface that fits into a system for checking the operation of the engine between the computer and the glow plugs of this engine.

L'une des fonctions de ce boítier est de mettre sous tension les bougies de préchauffage lorsqu'il en reçoit l'ordre du calculateur.One of the functions of this box is to put under tension the glow plugs when receiving them the order of the calculator.

De plus, un tel boítier doit intégrer un certain nombre de fonctions de sécurité et de détection de pannes pour répondre à certaines normes.In addition, such a case must integrate a certain number of safety and fault detection functions to meet certain standards.

C'est ainsi par exemple qu'un tel boítier doit couper l'alimentation des bougies lorsqu'il détecte une surintensité ou une surtension d'alimentation.This is for example that such a case must cut candle feeding when it detects an overcurrent or a power surge.

De plus, un tel boítier doit détecter toutes les pannes des bougies et relais correspondants et transmettre un signal d'état, c'est à dire un signal de diagnostic, au calculateur pour l'évaluation du fonctionnement de la fonction d'alimentation de ces bougies.In addition, such a box must detect all the spark plug and relay failures and transmit a status signal, i.e. a diagnostic signal, at calculator for the evaluation of the functioning of the function feeding these candles.

Le but de l'invention est de proposer un procédé et un dispositif de détection de la coupure d'une bougie de préchauffage d'un moteur Diesel de véhicule automobile qui soient simples, fiables et faciles à mettre en oeuvre dans un tel contexte.The object of the invention is to propose a method and a device for detecting the cut of a candle preheating of a diesel engine of a motor vehicle which are simple, reliable and easy to implement in such a context.

A cet effet, l'invention a pour objet un procédé de détection de la coupure d'une bougie de préchauffage d'un moteur Diesel de véhicule automobile, comportant au moins deux branches d'alimentation d'au moins deux bougies de préchauffage chacune, caractérisé en ce qu'il comporte les étapes suivantes :

  • on mesure, à chaque démarrage du moteur, les courants circulant dans les deux branches,
  • on calcule un rapport de ces deux courants, et
  • on compare le rapport calculé à un rapport de référence pour détecter une bougie coupée si le rapport calculé diffère du rapport de référence d'au moins un coefficient prédéterminé.
To this end, the subject of the invention is a method for detecting the cut out of a glow plug of a diesel engine of a motor vehicle, comprising at least two supply branches of at least two glow plugs each, characterized in that it comprises the following stages:
  • at each start of the engine, the currents flowing in the two branches are measured,
  • we calculate a ratio of these two currents, and
  • the calculated ratio is compared to a reference ratio to detect a cut candle if the calculated ratio differs from the reference ratio by at least one predetermined coefficient.

Avantageusement, on établit le rapport de référence lors d'une phase d'initialisation du dispositif à la première alimentation de celui-ci, par relevé des courants circulant dans les branches d'alimentation lors de cette phase d'initialisation, calcul du rapport de ces courants et stockage de ce rapport en tant que rapport de référence.Advantageously, the baseline report is established during an initialization phase of the device at the first supply thereof, by reading the circulating currents in the supply branches during this phase initialization, calculation of the ratio of these currents and storing this report as a baseline report.

Avantageusement également, le coefficient prédéterminé est égal à 0,7.Advantageously also, the predetermined coefficient is equal to 0.7.

Selon un autre aspect, l'invention a également pour objet un dispositif de détection pour la mise en oeuvre d'un tel procédé.According to another aspect, the invention also has for object a detection device for the implementation of a such process.

L'invention sera mieux comprise à l'aide de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés, sur lesquels :

  • la Fig.1 représente un schéma synoptique illustrant la structure générale d'un boítier électronique de commande de pré-postchauffage Diesel;
  • la Fig.2 représente un schéma synoptique illustrant la structure générale d'un exemple de réalisation d'un dispositif de détection selon l'invention; et
  • la Fig.3 illustre un organigramme représentant un exemple de fonctionnement d'un procédé de détection selon l'invention.
The invention will be better understood with the aid of the description which follows, given solely by way of example and made with reference to the appended drawings, in which:
  • Fig.1 shows a block diagram illustrating the general structure of an electronic control unit for diesel pre-postheating control;
  • Fig.2 shows a block diagram illustrating the general structure of an exemplary embodiment of a detection device according to the invention; and
  • Fig.3 illustrates a flowchart representing an example of the operation of a detection method according to the invention.

On reconnaít en effet sur la figure 1, un boítier électronique de pré-postchauffage pour moteur Diesel de véhicule automobile, ce boítier électronique étant désigné par la référence générale 1 sur cette figure 1.We recognize in fact in Figure 1, a housing preheating electronics for vehicle diesel engine automotive, this electronic unit being designated by the general reference 1 in this figure 1.

Ce boítier constitue comme cela a été indiqué précédemment, une interface de puissance qui s'intègre dans le système de contrôle du fonctionnement du moteur entre un calculateur d'injection désigné par la référence générale 2 et les bougies de préchauffage, désignées par la référence générale 3 sur cette figure 1.This case constitutes, as indicated above, a power interface that integrates into the engine operation control system between a injection computer designated by general reference 2 and the glow plugs, designated by the reference general 3 in this figure 1.

Dans l'exemple de réalisation, ces bougies sont réparties par paires, les bougies 1 et 2 étant associées dans une première paire 3a et les bougies 3 et 4 étant associées dans une deuxième paire 3b.In the embodiment, these candles are distributed in pairs, candles 1 and 2 being associated in a first pair 3a and the candles 3 and 4 being associated in a second pair 3b.

Chaque paire de bougies est alors alimentée par l'intermédiaire d'une branche d'alimentation respectivement 4 et 5, issue du boítier électronique 1.Each pair of candles is then powered by via a supply branch respectively 4 and 5, from electronic unit 1.

Ce boítier reçoit en entrée la masse, le plus d'alimentation issu de la batterie du véhicule et un signal de commande + APC.This box receives as input the mass, the most power from the vehicle battery and a signal from command + APC.

Ce boítier 1 comporte en fait un module d'alimentation désigné par la référence générale 6, un module de commande des bougies désigné par la référence générale 7 et un module de sécurité et de diagnostic désigné par la référence générale 8.This box 1 actually includes a power module designated by the general reference 6, a control module candles designated by the general reference 7 and a safety and diagnostic module designated by the reference general 8.

Le module de commande des bougies 7 reçoit un signal de commande par une ligne de commande (Co) 9 à partir du calculateur d'injection 2, et ce calculateur reçoit un signal de diagnostic par une ligne de diagnostic (Di) 10 émanant du module de sécurité et de diagnostic 8.The spark plug control module 7 receives a signal by a command line (Co) 9 from injection computer 2, and this computer receives a signal diagnostic by a diagnostic line (Di) 10 emanating from safety and diagnostic module 8.

Le module de sécurité et de diagnostic remplit plusieurs fonctions de protection comme cela a été indiqué précédemment.The safety and diagnostic module fulfills several protective functions as previously indicated.

De plus, celui-ci peut comporter un dispositif de détection de la coupure d'une bougie de préchauffage dont un exemple de réalisation est illustré sur la figure 2.In addition, it may include a device for detection of the cut-out of a glow plug, one of which exemplary embodiment is illustrated in FIG. 2.

On sait en effet, qu'un tel module de sécurité et de diagnostic doit être capable de détecter un bon fonctionnement des bougies de préchauffage, la coupure d'au moins l'une des bougies et la coupure de la totalité des bougies.We know that such a security and diagnosis must be able to detect proper operation glow plugs, cutting at least one of the candles and cutting all of the candles.

Dans le dispositif de détection selon l'invention, on analyse les courants circulant dans les branches 4 et 5 d'alimentation de ces bougies.In the detection device according to the invention, we analyze the currents flowing in branches 4 and 5 feeding these candles.

En effet, le dispositif de détection selon l'invention comporte des moyens 11 et 12, de mesure des courants IB1 et IB2 circulant dans les branches 4 et 5, respectivement, raccordant le module de commande 7 de l'alimentation des bougies à celles-ci.Indeed, the detection device according to the invention includes means 11 and 12 for measuring currents IB1 and IB2 circulating in branches 4 and 5, respectively, connecting the control module 7 of the power supply candles to them.

Ces informations de courant IB1 et IB2 sont ensuite transmises à une unité centrale de traitement d'informations désignée par la référence générale 13 sur la figure 2, qui est adaptée pour calculer un rapport K de ces deux courants et pour délivrer ce rapport calculé Kcal à des moyens de comparaison 14 de celui-ci à un rapport de référence Kref, pour détecter une bougie coupée si le rapport calculé par l'unité 13 diffère du rapport de référence d'au moins un coefficient prédéterminé S.This current information IB1 and IB2 are then transmitted to a central information processing unit designated by the general reference 13 in Figure 2, which is suitable for calculating a ratio K of these two currents and to deliver this calculated Kcal ratio to means of comparison 14 of it to a Kref reference report, to detect a cut candle if the ratio calculated by unit 13 differs from the baseline by at least one predetermined coefficient S.

En fait, l'entrée correspondante des moyens de comparaison reçoit une information Kref.S établie par des moyens de calcul 15, par multiplication du coefficient prédéterminé S stocké dans des moyens de mémorisation 16 et du rapport Kref stocké dans des moyens de mémorisation 17. La comparaison de ces informations permet alors de détecter une bougie coupée.In fact, the corresponding input of the means of comparison receives Kref.S information established by calculation means 15, by multiplying the predetermined coefficient S stored in storage means 16 and Kref report stored in storage means 17. The comparison of this information then makes it possible to detect a cut candle.

Comme cela sera décrit plus en détail par la suite, le rapport de référence Kref peut être établi lors d'une phase d'initialisation du dispositif de détection, à la première alimentation de celui-ci, par calcul du rapport des courants circulant dans les branches 4 et 5, lors de cette phase d'initialisation et stockage de celui-ci.As will be described in more detail later, the Kref reference report can be established during a detection device initialization phase, at the first supply thereof, by calculating the ratio of currents flowing in branches 4 and 5, during this initialization phase and storage thereof.

Bien entendu, d'autres modes de réalisation de ce dispositif peuvent être envisagés.Of course, other embodiments of this device can be considered.

En fait et comme on peut le voir sur la figure 3, le fonctionnement d'un tel dispositif débute par une étape 20 d'initialisation et d'entrée dans le dispositif de la valeur du coefficient prédéterminé S.In fact and as can be seen in Figure 3, the operation of such a device begins with a step 20 initialization and entry into the value device of the predetermined coefficient S.

Ce coefficient constitue un seuil de détection qui peut par exemple être égal à 0,7.This coefficient constitutes a detection threshold which can for example be equal to 0.7.

Ensuite, lors de l'étape 21, l'unité de traitement d'informations 13 par exemple, détermine s'il s'agit de la première alimentation du dispositif pour déterminer si le dispositif nécessite une phase d'initialisation.Then, during step 21, the processing unit information 13 for example, determines if this is the device first power to determine if the device requires an initialization phase.

Si c'est le cas, cette unité de traitement d'informations 13 assure en 22, l'acquisition des courants circulant dans les branches 4 et 5 d'alimentation des bougies, c'est à dire par exemple les courants IB1 et IB2 respectivement dans les branches 4 et 5.If so, this information processing unit 13 ensures in 22, the acquisition of the circulating currents in branches 4 and 5 of candle supply, ie for example the currents IB1 and IB2 respectively in branches 4 and 5.

Après cette acquisition de courants en 22, qui peut être réalisée après un temps déterminé d'alimentation des bougies, ce temps pouvant être établi de façon expérimentale pour obtenir une stabilisation de ceux-ci, l'unité centrale de traitement d'informations calcule en 23, le rapport de référence Kref, à partir de ces courants IB1 et IB2, en utilisant la relation Kref = IB1/IB2, par exemple.After this acquisition of currents in 22, which can be carried out after a determined feeding time of the candles, this time can be established experimentally to obtain a stabilization of these, the central unit of information processing calculates in 23, the ratio of reference Kref, from these currents IB1 and IB2, using the relationship Kref = IB1 / IB2, for example.

Ce rapport de référence Kref est ensuite stocké lors de l'étape 24 par exemple dans les moyens de mémorisation 17 décrits en regard de la figure 2. Ceci permet alors aux moyens de calcul 15 décrits en regard de la figure 2, d'établir le produit Kref. x S, S étant stocké dans les moyens de stockage 16 de la figure 2.This Kref reference report is then stored during from step 24 for example in the storage means 17 described with reference to FIG. 2. This then allows the calculation means 15 described with reference to FIG. 2, to establish the Kref product. x S, S being stored in the means of storage 16 of FIG. 2.

Une fois cette phase d'initialisation terminée et à chaque mise sous tension de ce dispositif, c'est-à-dire à chaque démarrage du moteur du véhicule, l'unité centrale de traitement d'informations 13 relève lors de l'étape 25, les courants circulant dans les branches 4 et 5, c'est-à-dire les courants IB1 et IB2.Once this initialization phase is complete and each power-up of this device, i.e. each time the vehicle engine is started, the central unit information processing 13 comes up in step 25, the currents flowing in branches 4 and 5, i.e. the currents IB1 and IB2.

A partir de ces courants acquis pour chaque nouvelle alimentation des bougies lors de chaque démarrage du moteur, cette unité centrale de traitement d'informations 13 détermine lors de l'étape 26, un rapport calculé Kcal en utilisant la relation Kcal=IB1/IB2, par exemple.From these currents acquired for each new spark plug supply at each engine start, this central information processing unit 13 determines in step 26, a calculated Kcal ratio using the relationship Kcal = IB1 / IB2, for example.

On conçoit qu'en fonctionnement normal, c'est-à-dire lorsque toute les bougies sont opérationnelles, ce rapport calculé Kcal doit être égal au rapport Kref établi lors de la phase d'initialisation du dispositif.It is understood that in normal operation, that is to say when all the candles are operational, this report calculated Kcal must be equal to the ratio Kref established during the device initialization phase.

Par contre, si l'une des bougies est coupée par exemple la bougie 1 ou la bougie 2 alimentée par la branche 4 d'alimentation, le rapport Kcal calculé diffère du rapport Kref établi lors de la phase d'initialisation.On the other hand, if one of the candles is cut by example candle 1 or candle 2 powered by the branch 4 feed, the calculated Kcal ratio differs from the ratio Kref established during the initialization phase.

En effet, l'une des bougies étant coupée, le courant IB1 circulant dans la branche correspondante est modifié.Indeed, one of the candles being cut, the current IB1 circulating in the corresponding branch is modified.

Pour éviter tout problème de détection intempestive de coupure d'une bougie, lié aux dispersions ou aux dérives de celles-ci, on établit alors un seuil de détection grâce au coefficient S.To avoid any problem of untimely detection for cutting a candle, linked to dispersions or drifts of these, a detection threshold is then established using at coefficient S.

En effet, on ne détecte une bougie coupée que si le rapport calculé Kcal diffère du rapport de référence Kref d'au moins ce coefficient prédéterminé S.Indeed, a cut candle is only detected if the calculated ratio Kcal differs from the reference ratio Kref at least this predetermined coefficient S.

C'est ainsi par exemple que lors de l'étape 27, l'unité centrale de traitement d'informations 13 compare le rapport calculé Kcal au rapport de référence Kref multiplié par le coefficient de détection prédéterminé S pour détecter une bougie coupée en cas de concordance et un fonctionnement normal en cas de discordance,For example, during step 27, the central information processing unit 13 compares the calculated ratio Kcal to the multiplied reference ratio Kref by the predetermined detection coefficient S to detect a spark plug cut in the event of a match and functioning normal in case of discrepancy,

Mis sous forme d'équation, le fonctionnement de ce dispositif peut alors être résumé comme suit :

  • en fonctionnement normal : IB1 = KIB2,
  • si l'une des bougies est coupée par exemple dans la branche d'alimentation 4 : IB1 ≤ à K.S. IB2,
  • tandis que si les quatre bougies sont coupées : IB1 = IB2 = 0.
Put in the form of an equation, the operation of this device can then be summarized as follows:
  • in normal operation: IB1 = KIB2,
  • if one of the candles is cut, for example in supply branch 4: IB1 ≤ KS IB2,
  • while if the four candles are cut: IB1 = IB2 = 0.

On conçoit alors que le coefficient S doit être conservé en mémoire dans le dispositif et est utilisé à chaque démarrage du moteur du véhicule pour s'assurer du fonctionnement correct des bougies de préchauffage de celui-ci.We can then see that the coefficient S must be kept stored in the device and is used each time starting the vehicle engine to ensure operation correct glow plugs of it.

Il va de soi bien entendu que différents modes de fonctionnement de ce dispositif peuvent être envisagés.It goes without saying of course that different modes of operation of this device can be envisaged.

Claims (7)

Procédé de détection de la coupure d'une bougie de préchauffage d'un moteur Diesel de véhicule automobile, comportant au moins deux branches (4,5) d'alimentation d'au moins deux bougies de préchauffage chacune, caractérisé en ce qu'il comporte les étapes suivantes : on mesure (en 25), à chaque démarrage du moteur, les courants (IB1, IB2) dans les deux branches, on calcule (en 26) un rapport de ces deux courants, et on compare (en 27) le rapport calculé (Kcal) à un rapport de référence (Kref) pour détecter une bougie coupée si le rapport calculé (Kcal) diffère du rapport de référence (Kref) d'au moins un coefficient prédéterminé (S). Method for detecting the cut out of a glow plug of a diesel engine of a motor vehicle, comprising at least two branches (4,5) supplying at least two glow plugs each, characterized in that it involves the following steps: we measure (at 25), each time the engine is started, the currents (IB1, IB2) in the two branches, one calculates (in 26) a ratio of these two currents, and we compare (at 27) the calculated ratio (Kcal) to a reference ratio (Kref) to detect a cut candle if the calculated ratio (Kcal) differs from the reference ratio (Kref) by at least one predetermined coefficient (S) . Procédé selon la revendication 1, caractérisé en ce qu'on établit le rapport de référence (Kref) lors d'une phase d'initialisation du dispositif à la première alimentation de celui-ci, par relevé (en 22) des courants (IB1,IB2) circulant dans les branches d'alimentation (4,5) lors de cette phase d'initialisation, calcul (en 23) du rapport de ces courants et stockage de ce rapport (en 24) en tant que rapport de référence (Kref).Method according to claim 1, characterized in what one establishes the reference report (Kref) during a device initialization phase at first power supply of it, by reading (at 22) the currents (IB1, IB2) circulating in the supply branches (4,5) during this initialization phase, calculation (in 23) of the ratio of these currents and storing this report (at 24) as baseline report (Kref). Procédé selon la revendication 1 ou 2, caractérisé en ce que le coefficient prédéterminé (S) est égal à 0,7.Method according to claim 1 or 2, characterized in that the predetermined coefficient (S) is equal to 0.7. Dispositif de détection de la coupure d'une bougie de préchauffage d'un moteur Diesel de véhicule automobile, comportant au moins deux branches (4,5) d'alimentation d'au moins deux bougies de préchauffage chacune, caractérisé en ce qu'il comporte des moyens (11,12) de mesure des courants circulant dans les deux branches (4,5), à chaque démarrage du moteur, des moyens (13) de calcul d'un rapport (Kcal) de ces deux courants, et des moyens (14) de comparaison du rapport calculé (Kcal) à un rapport de référence (Kref) pour détecter une bougie coupée si le rapport calculé diffère du rapport de référence d'au moins un coefficient prédéterminé (S).Candle cut detection device preheating of a diesel engine of a motor vehicle, comprising at least two supply branches (4,5) at least two glow plugs each, characterized in that it includes means (11,12) for measuring currents circulating in the two branches (4,5), at each start engine, means (13) for calculating a ratio (Kcal) of these two currents, and means (14) of comparison from the calculated ratio (Kcal) to a reference ratio (Kref) to detect a cut candle if the calculated ratio differs from the reference ratio by at least one coefficient predetermined (S). Dispositif selon la revendication 4, caractérisé en ce qu'il comporte des moyens (16) de stockage du coefficient prédéterminé (S) et des moyens (17) de stockage du rapport de référence (Kref), délivré par les moyens de calcul (13) de ce rapport de référence, à partir des courants circulant dans les branches d'alimentation (4,5), lors d'une phase d'initialisation de ce dispositif à la première alimentation de celui-ci.Device according to claim 4, characterized in that it includes means (16) for storing the coefficient predetermined (S) and means (17) for storing the reference report (Kref), delivered by the calculation means (13) of this reference report, based on the currents circulating in the supply branches (4,5), during a initialization phase of this device at the first power supply of it. Dispositif selon l'une quelconque des revendications 4 ou 5, caractérisé en ce que le coefficient prédéterminé (S) est égal à 0,7.Device according to any one of the claims 4 or 5, characterized in that the predetermined coefficient (S) is equal to 0.7. Dispositif selon la revendication 4,5 ou 6, caractérisé en ce que les moyens de comparaison (14) reçoivent sur une entrée le rapport calculé (Kcal) et sur une autre entrée, le produit du rapport de référence (Kref) par le coefficient prédéterminé (S), établi par des moyens de calcul (15).Device according to claim 4,5 or 6, characterized in that the comparison means (14) receive on one entry the calculated ratio (Kcal) and on another input, the product of the baseline report (Kref) by the predetermined coefficient (S), established by means of calculation (15).
EP19980402360 1997-10-08 1998-09-24 Cut-off detection method and device for glow plug Diesel engine of motor vehicle Expired - Lifetime EP0908620B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9712558 1997-10-08
FR9712558A FR2769343B1 (en) 1997-10-08 1997-10-08 METHOD AND DEVICE FOR DETECTING THE CUTTING OF A GLOW PLUG OF A DIESEL ENGINE OF A MOTOR VEHICLE

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EP0908620A1 true EP0908620A1 (en) 1999-04-14
EP0908620B1 EP0908620B1 (en) 2002-06-12

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Publication number Priority date Publication date Assignee Title
DE102008032482B3 (en) * 2008-07-10 2009-11-12 Continental Automotive Gmbh Method for detecting malfunction in glow system in motor vehicle e.g. during idle phase of engine, involves modulating glowing operation, determining measuring data and connecting or disconnecting system components

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2351276A1 (en) * 1976-05-14 1977-12-09 Vdo Schindling Monitor circuit for diesel engine heater plugs - has plugs connected in parallel groups and connected to magnetic relay
JPS59128981A (en) * 1983-01-12 1984-07-25 Fujitsu Ten Ltd Blown-off detecting method of diesel engine glow plug
US4500775A (en) * 1982-04-02 1985-02-19 Nippondenso Co., Ltd. Method and apparatus for detecting an open circuit in a glow plug group for combination with a glow plug heating control circuit
JPS61104165A (en) * 1984-10-25 1986-05-22 Mitsubishi Electric Corp Device for detecting disconnection of preheating plug of internal combustion engine
JPS6481617A (en) * 1987-09-21 1989-03-27 Mita Industrial Co Ltd Disconnection or shortcircuit trouble detector
US5122968A (en) * 1987-06-23 1992-06-16 Robert Bosch Gmbh Apparatus and method for driving and controlling electric consumers, in particular heat plugs

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2351276A1 (en) * 1976-05-14 1977-12-09 Vdo Schindling Monitor circuit for diesel engine heater plugs - has plugs connected in parallel groups and connected to magnetic relay
US4500775A (en) * 1982-04-02 1985-02-19 Nippondenso Co., Ltd. Method and apparatus for detecting an open circuit in a glow plug group for combination with a glow plug heating control circuit
JPS59128981A (en) * 1983-01-12 1984-07-25 Fujitsu Ten Ltd Blown-off detecting method of diesel engine glow plug
JPS61104165A (en) * 1984-10-25 1986-05-22 Mitsubishi Electric Corp Device for detecting disconnection of preheating plug of internal combustion engine
US5122968A (en) * 1987-06-23 1992-06-16 Robert Bosch Gmbh Apparatus and method for driving and controlling electric consumers, in particular heat plugs
JPS6481617A (en) * 1987-09-21 1989-03-27 Mita Industrial Co Ltd Disconnection or shortcircuit trouble detector

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 253 (M - 339) 20 November 1984 (1984-11-20) *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 286 (M - 521) 27 September 1986 (1986-09-27) *
PATENT ABSTRACTS OF JAPAN vol. 013, no. 307 (E - 787) 13 July 1989 (1989-07-13) *

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DE69805930T2 (en) 2003-01-09
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EP0908620B1 (en) 2002-06-12
FR2769343B1 (en) 2000-01-28

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