EP1960652B1 - Method for storing data concerning an operating fault of a device - Google Patents

Method for storing data concerning an operating fault of a device Download PDF

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Publication number
EP1960652B1
EP1960652B1 EP06842063.7A EP06842063A EP1960652B1 EP 1960652 B1 EP1960652 B1 EP 1960652B1 EP 06842063 A EP06842063 A EP 06842063A EP 1960652 B1 EP1960652 B1 EP 1960652B1
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EP
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Prior art keywords
parameter
fault
value
occurrence
current value
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EP06842063.7A
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German (de)
French (fr)
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EP1960652A1 (en
Inventor
Joseph Regnard De Lagny
Abdelmalik Belaid
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Renault SAS
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Renault SAS
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Classifications

    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C3/00—Registering or indicating the condition or the working of machines or other apparatus, other than vehicles
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C5/00—Registering or indicating the working of vehicles
    • G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
    • F02D2200/501—Vehicle speed
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/266—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor the computer being backed-up or assisted by another circuit, e.g. analogue

Definitions

  • the invention relates to a method for storing information concerning a malfunction of a device.
  • the invention finds particular application for the diagnosis of a failure of a device (for example a powertrain of the vehicle) in a motor vehicle, to facilitate the repair of the faulty device.
  • Modern motor vehicles use on-board computers to control many electrical or mechanical devices, such as for controlling an engine injection system, for controlling an automatic or robotic gearbox, etc. .
  • these computers also include means for implementing various methods of electrical or functional diagnosis.
  • the computer stores in a non-volatile memory information relating to the detected fault; this information notably comprises a code associated with the detected fault, and possibly values of parameters characteristic of the operation of the device, also called context data.
  • Context data can be generic, that is, identical for all the faults monitored, or specific to a fault considered; in this case they may be different for different defects.
  • the speed reference and the value of the speed measured during the detection of the fault are stored.
  • the stored information is intended to help the subsequent repairer by providing additional information on the conditions in which the fault has been detected.
  • the context data is recorded only at the first occurrence of the fault. It is therefore impossible to know whether the conditions recorded correspond really to particular conditions in which the defect occurs regularly, or simply to the "arbitrary" conditions that prevailed during the fortuitous appearance of the defect. For example, for an electrical fault where the engine speed recorded at the first occurrence of the defect is 2500 rpm, nothing allows the repairer to know if it is a permanent defect appeared for the first time. times at 2500 rpm, or an intermittent fault only occurring at a speed close to 2500 rpm and which would be due for example to a phenomenon of resonance.
  • the context data are stored at each occurrence of the fault that they characterize, which facilitates the diagnosis.
  • the publication US 2004/002810 discloses a method for detecting errors relating to a malfunction of a device, recording operational data, storing the data, retrieving the data from a computer, and displaying the data. indicating an error.
  • This method involves keeping a history of maximum and minimum values. The set of data is thus stored in memory at first, to be processed in a second time.
  • the object of the invention is to propose a new method for storing information relating to a defect, which does not have the drawbacks of known methods. More specifically, the object of the invention is to propose a new storage method, which makes it possible to provide exhaustive information for a future diagnosis of the fault, while limiting the overall volume of stored information.
  • the update phase may also comprise the step E12, performed at the occurrence of the fault and consisting of a repetition of the step E11 for each characteristic parameter of the device in operation.
  • the method thus makes it possible to memorize minimum and maximum values for several characteristic parameters of the device.
  • the update phase is repeated at each occurrence of the fault.
  • the initialization phase thus makes it possible on the one hand to memorize a precise "image" of a fault occurrence, and on the other hand to initialize the minimum and maximum values of each parameter and the number of occurrence of the fault.
  • the method according to the invention is particularly useful for storing information concerning a malfunction of a device such as a powertrain in a vehicle.
  • the invention is particularly interesting for the diagnosis of intermittent defects, that is to say which do not last, but which reproduce several times in time.
  • a fault is detected when, in the absence of intervention of the driver of the vehicle, the speed is always different from the set speed after a time T.
  • the detection of the defect is carried out by a comparator which compares the speed measured by a sensor to the set speed imposed by the driver.
  • the parameters of the regulating device relevant for the identification and the repair of the defect are the temperature in the casing of the regulating device (the electronic components of the device do not work or harm outside a range normal operation) and vehicle speed (the control loop is not or poorly effective outside a specified speed range).
  • the current value of the housing temperature and the motor speed are stored as reference values: these reference values define an accurate image of the device at the moment of appearance of the defect, which image will be preserved throughout the process.
  • the minimum value and the maximum value of the temperature are initialized with the current temperature, and the minimum value and the maximum value of the speed at the current value. We thus have first minimum / maximum values of the parameters, which can be updated later.
  • a number of occurrences is initialized to one.
  • this number is initialized to one when the fault disappears, in the example when the comparator detects that the speed is sufficiently close to the set speed, to 1% for example.
  • Initializing the number of occurrences means that there has been a defect, which has disappeared. Recall that the method of the invention is intended to record the conditions of occurrence of an intermittent defect, that is to say non-permanent but which is repeated.
  • step E11 the minimum and maximum values stored for the temperature of the case are updated, if necessary, that is to say if the current value of the temperature is less than the value minimum or greater than the maximum value previously stored.
  • step E12 the minimum and maximum values stored for the motor speed are updated, if necessary, that is, if the current value of the speed is less than the minimum value or greater than the minimum value. maximum value previously stored.
  • step E13 the number of occurrences is incremented by one.
  • this number is initialized to one when the fault disappears, for the same reasons as above.
  • the updating phase is then repeated as many times as necessary, at each new occurrence of the defect.
  • the invention has been developed for a control device of the powertrain of a motor vehicle. But it can very easily be extended to any electronic computer provided with means for detecting a malfunction of a device and means for storing information relating to the appearance of the detected fault.
  • the monitored device may also be for example a control device of a braking system, a speed control device, a temperature control device, etc.
  • the method according to the invention combines the advantages of the prior solutions, and avoids their disadvantages.
  • the implementation of the method according to the invention leads to a 3-fold increase in the capacity of the non-volatile memory area of the computer allocated to the storage of the context data of the defect.
  • this multiplication is largely acceptable.
  • the implementation of the method according to the invention makes it possible, on the one hand, to limit the size necessary to the minimum necessary. of memory used, and secondly to keep all the wealth of information stored during the use of the system. Indeed, in the previous solution, the storage of the data necessarily stopped after m detections of the failure (limitation due to the size of the memory). In contrast, in the invention, the data are updated at each new occurrence of the defect, regardless of the number of occurrences of the defect, and this until its repair.

Description

L'invention concerne un procédé de mémorisation d'informations concernant un défaut de fonctionnement d'un dispositif. L'invention trouve notamment une application pour le diagnostic d'une défaillance d'un dispositif (par exemple un groupe motopropulseur du véhicule) dans un véhicule automobile, afin de faciliter la réparation du dispositif défaillant.The invention relates to a method for storing information concerning a malfunction of a device. The invention finds particular application for the diagnosis of a failure of a device (for example a powertrain of the vehicle) in a motor vehicle, to facilitate the repair of the faulty device.

Les véhicules automobiles modernes font appel à des calculateurs embarqués pour la commande de nombreux dispositifs électriques ou mécaniques, comme par exemple pour la commande d'un système d'injection du moteur, pour la commande d'une boîte de vitesse automatique ou robotisée, etc.Modern motor vehicles use on-board computers to control many electrical or mechanical devices, such as for controlling an engine injection system, for controlling an automatic or robotic gearbox, etc. .

Pour garantir à la fois la sécurité des usagers face à une éventuelle défaillance d'un dispositif ou d'un composant d'un système de commande et la remise en état du dispositif défaillant par un réparateur, ces calculateurs intègrent également des moyens pour mettre en oeuvre divers procédés de diagnostic électrique ou fonctionnel.To guarantee both the safety of the users in the event of a possible failure of a device or a component of a control system and the repair of the faulty device by a repairer, these computers also include means for implementing various methods of electrical or functional diagnosis.

Lorsqu'une défaillance d'un dispositif est diagnostiquée pour la première fois, le calculateur mémorise dans une mémoire non volatile des informations relatives au défaut constaté ; ces informations comprennent notamment un code associé au défaut constaté, et éventuellement des valeurs de paramètres caractéristiques du fonctionnement du dispositif, encore appelées données de contexte. Les données de contexte peuvent être génériques, c'est-à-dire identiques pour tous les défauts surveillés, ou bien spécifiques à un défaut considéré ; elles peuvent dans ce cas être différentes pour des défauts différents. Par exemple, dans le cas d'un défaut lié à une régulation d'une vitesse, on mémorise la consigne de vitesse et la valeur de la vitesse mesurée lors de la détection du défaut. Dans tous les cas, les informations mémorisées ont vocation à aider le réparateur ultérieur en lui fournissant des informations complémentaires sur les conditions dans lesquelles le défaut a été détecté.When a failure of a device is diagnosed for the first time, the computer stores in a non-volatile memory information relating to the detected fault; this information notably comprises a code associated with the detected fault, and possibly values of parameters characteristic of the operation of the device, also called context data. Context data can be generic, that is, identical for all the faults monitored, or specific to a fault considered; in this case they may be different for different defects. For example, in the case of a fault related to a regulation of a speed, the speed reference and the value of the speed measured during the detection of the fault are stored. In any case, the stored information is intended to help the subsequent repairer by providing additional information on the conditions in which the fault has been detected.

Dans certains procédés de mémorisation actuels, les données de contexte sont enregistrées uniquement lors de la première occurrence du défaut. Il est donc impossible de savoir si les conditions enregistrées correspondent réellement à des conditions particulières où le défaut se produit régulièrement, ou simplement aux conditions "quelconques" qui régnaient lors de l'apparition fortuite du défaut. A titre d'exemple, pour un défaut électrique où le régime moteur enregistré à la première occurrence du défaut est de 2500 tr/min, rien ne permet au réparateur de savoir s'il s'agit d'un défaut permanent apparu pour la première fois au régime de 2500 tr/min, ou d'un défaut intermittent ne se produisant qu'à un régime proche de 2500 tr/min et qui serait dû par exemple à un phénomène de résonance.In some current storage methods, the context data is recorded only at the first occurrence of the fault. It is therefore impossible to know whether the conditions recorded correspond really to particular conditions in which the defect occurs regularly, or simply to the "arbitrary" conditions that prevailed during the fortuitous appearance of the defect. For example, for an electrical fault where the engine speed recorded at the first occurrence of the defect is 2500 rpm, nothing allows the repairer to know if it is a permanent defect appeared for the first time. times at 2500 rpm, or an intermittent fault only occurring at a speed close to 2500 rpm and which would be due for example to a phenomenon of resonance.

Cette solution n'est pas satisfaisante, car les informations stockées sont souvent insuffisantes pour permettre une réparation rapide, en particulier dans le cas de défauts intermittents (par exemple défauts électriques dus à des mauvais contacts) et/ou dans le cas de défauts complexes (par exemple défauts fonctionnels se produisant dans des conditions précises et restreintes).This solution is not satisfactory because the stored information is often insufficient to allow a fast repair, in particular in the case of intermittent faults (for example electrical faults due to bad contacts) and / or in the case of complex faults ( for example functional defects occurring under specific and restricted conditions).

Dans d'autres procédés de mémorisation actuels, les données de contexte sont mémorisées à chaque occurrence du défaut qu'elles caractérisent, ce qui facilite le diagnostic.In other current storage methods, the context data are stored at each occurrence of the fault that they characterize, which facilitates the diagnosis.

La publication US 2004/002810 , décrit en particulier un procédé de détection d'erreurs concernant un défaut de fonctionnement d'un dispositif, par l'enregistrement de données opérationnelles, le stockage de ces données, la récupération de ces données par un ordinateur, et l'affichage des données indiquant une erreur. Cette méthode implique la conservation d'un historique de valeurs maximales et minimales. L'ensemble des données est ainsi conservé en mémoire dans un premier temps, pour être traité dans un deuxième temps.The publication US 2004/002810 , in particular discloses a method for detecting errors relating to a malfunction of a device, recording operational data, storing the data, retrieving the data from a computer, and displaying the data. indicating an error. This method involves keeping a history of maximum and minimum values. The set of data is thus stored in memory at first, to be processed in a second time.

Une telle solution est donc extrêmement coûteuse en termes de mémoire non volatile. En effet, si les données de contexte enregistrées lors de la détection d'un défaut représentent une taille de n octets, l'apparition m fois de ce défaut conduira donc à utilisation de n * m octets de mémoire. La richesse des informations transmises est donc rapidement limitée par la taille de la mémoire.Such a solution is therefore extremely expensive in terms of non-volatile memory. Indeed, if the context data recorded during the detection of a defect represent a size of n bytes, the appearance m times of this defect will therefore lead to the use of n * m bytes of memory. The richness of the information transmitted is therefore quickly limited by the size of the memory.

L'invention a pour but de proposer un nouveau procédé de mémorisation d'informations relatives à un défaut, ne présentant pas les inconvénients des procédés connus. Plus précisément, l'invention a pour but de proposer un nouveau procédé de mémorisation, qui permet de fournir des informations exhaustives pour un diagnostic futur du défaut, tout en limitant le volume global d'information mémorisé.The object of the invention is to propose a new method for storing information relating to a defect, which does not have the drawbacks of known methods. More specifically, the object of the invention is to propose a new storage method, which makes it possible to provide exhaustive information for a future diagnosis of the fault, while limiting the overall volume of stored information.

Ce but est atteint avec un procédé de mémorisation d'informations concernant un défaut de fonctionnement d'un dispositif, dans lequel on enregistre en mémoire d'un calculateur des informations comprenant une valeur minimum et une valeur maximum d'un paramètre caractéristique du fonctionnement du dispositif, ledit paramètre caractéristique étant une donnée de contexte de fonctionnement du dispositif, et un nombre d'occurrences du dit défaut. Ce procédé est caractérisé en ce qu'on effectue une phase de mise à jour des enregistrements mémorisés qui est réalisée lors d'une occurrence du défaut et qui comprend :

  • une étape E11 consistant à:
    • remplacer en mémoire la valeur minimum du paramètre par la valeur actuelle du paramètre si la valeur actuelle du paramètre est inférieure à la valeur minimum, ou
    • remplacer en mémoire la valeur maximum dudit paramètre par la valeur actuelle du paramètre si la valeur actuelle est supérieure à la valeur maximum précédemment mémorisée; et
  • une étape E13 consistant en une incrémentation d'un nombre d'occurrences du défaut.
This object is achieved with a method of storing information relating to a malfunction a device, in which information in the memory of a computer is stored comprising a minimum value and a maximum value of a characteristic parameter of the operation of the device, said characteristic parameter being a device operating context data, and a number of occurrences of the said defect. This method is characterized in that an updating phase of the stored records is carried out which is carried out during an occurrence of the defect and which comprises:
  • a step E11 consisting of:
    • replace in memory the minimum value of the parameter by the current value of the parameter if the current value of the parameter is lower than the minimum value, or
    • replace in memory the maximum value of said parameter by the current value of the parameter if the current value is greater than the maximum value previously stored; and
  • a step E13 consisting of an incrementation of a number of occurrences of the fault.

La phase de mise à jour peut également comprendre l'étape E12, réalisée lors de l'occurrence du défaut et consistant en une répétition de l'étape E11 pour chaque paramètre caractéristique du dispositif en fonctionnement.The update phase may also comprise the step E12, performed at the occurrence of the fault and consisting of a repetition of the step E11 for each characteristic parameter of the device in operation.

Le procédé permet ainsi de mémoriser des valeurs minimum et maximum pour plusieurs paramètres caractéristiques du dispositif.The method thus makes it possible to memorize minimum and maximum values for several characteristic parameters of the device.

La phase de mise à jour est répétée à chaque occurrence du défaut.The update phase is repeated at each occurrence of the fault.

Ainsi, il est possible de savoir précisément combien de fois le défaut est apparu.Thus, it is possible to know precisely how many times the defect has appeared.

Selon un mode préféré de mise en oeuvre, une phase d'initialisation est réalisée lors d'une première occurrence du défaut, comprenant une ou plusieurs des étapes suivantes, consistant à :

  • E01 : initialiser une valeur de référence du paramètre à la valeur actuelle du paramètre
  • E02 : initialiser la valeur minimum du paramètre et la valeur maximum du paramètre à la valeur actuelle du paramètre.
  • E03 : répéter l'étape E01 et / ou l'étape E02 pour chaque paramètre caractéristique du dispositif en fonctionnement,
  • E04 : initialisation du nombre d'occurrence
According to a preferred embodiment, an initialization phase is performed during a first occurrence of the fault, comprising one or more of the following steps, consisting of:
  • E01: initialize a reference value of the parameter to the current value of the parameter
  • E02: initialize the minimum value of the parameter and the maximum value of the parameter to the current value of the parameter.
  • E03: repeat step E01 and / or step E02 for each characteristic parameter of the device in operation,
  • E04: initialization of the number of occurrences

La phase d'initialisation permet ainsi d'une part de mémoriser une "image" précise d'une occurrence du défaut, et d'autre part d'initialiser les valeurs minimum et maximum de chaque paramètre et le nombre d'occurrence du défaut.The initialization phase thus makes it possible on the one hand to memorize a precise "image" of a fault occurrence, and on the other hand to initialize the minimum and maximum values of each parameter and the number of occurrence of the fault.

Le procédé selon l'invention est notamment intéressant pour la mémorisation d'informations concernant un défaut de fonctionnement d'un dispositif tel qu'un groupe motopropulseur dans un véhicule.The method according to the invention is particularly useful for storing information concerning a malfunction of a device such as a powertrain in a vehicle.

L'invention est notamment intéressante pour le diagnostic de défauts intermittents, c'est-à-dire qui ne durent pas, mais qui se reproduisent plusieurs fois dans le temps.The invention is particularly interesting for the diagnosis of intermittent defects, that is to say which do not last, but which reproduce several times in time.

Le procédé selon l'invention va être décrit ci-dessous dans le cadre d'un exemple non limitatif, dans lequel le procédé dans sa version la plus complète et la plus performante est mis en oeuvre pour le diagnostic du fonctionnement d'un dispositif de régulation qui permet la régulation de la vitesse d'un véhicule automobile autour d'une vitesse de consigne.The method according to the invention will be described below in the context of a non-limiting example, in which the method in its most complete and most efficient version is implemented for the diagnosis of the operation of a device of regulation that allows the regulation of the speed of a motor vehicle around a set speed.

Dans l'exemple, un défaut est détecté lorsque, en l'absence d'intervention du conducteur du véhicule, la vitesse est toujours différente de la vitesse de consigne au bout d'un temps T. La détection du défaut est réalisée par un comparateur qui compare la vitesse mesurée par un capteur à la vitesse de consigne imposée par le conducteur.In the example, a fault is detected when, in the absence of intervention of the driver of the vehicle, the speed is always different from the set speed after a time T. The detection of the defect is carried out by a comparator which compares the speed measured by a sensor to the set speed imposed by the driver.

Dans l'exemple, on considère que les paramètres du dispositif de régulation pertinents pour l'identification et la réparation du défaut sont la température dans le boîtier du dispositif de régulation (les composants électroniques du dispositif fonctionnent pas ou mal en dehors d'une plage de fonctionnement habituelle) et la vitesse du véhicule (la boucle de régulation n'est pas ou peu efficace en dehors d'une plage de vitesse spécifiée).In the example, it is considered that the parameters of the regulating device relevant for the identification and the repair of the defect are the temperature in the casing of the regulating device (the electronic components of the device do not work or harm outside a range normal operation) and vehicle speed (the control loop is not or poorly effective outside a specified speed range).

Le procédé selon l'invention est initialisé lors de la première occurrence du défaut. Lors de la phase d'initialisation du procédé, les étapes suivantes sont réalisées, qui consistent à :

  • E01 : initialiser une valeur de référence du paramètre à la valeur actuelle du paramètre
  • E02 : initialiser la valeur minimum du paramètre et la valeur maximum du paramètre à la valeur actuelle du paramètre,
  • E03 : répéter l'étape E01 et / ou l'étape E02 pour chaque paramètre caractéristique du dispositif en fonctionnement,
  • E04 : initialisation du nombre d'occurrence
The method according to the invention is initialized during the first occurrence of the defect. During the initialization phase of the method, the following steps are performed, which consist of:
  • E01: initialize a reference value of the parameter to the current value of the parameter
  • E02: initialize the minimum value of the parameter and the maximum value of the parameter to the current value of the parameter,
  • E03: repeat step E01 and / or step E02 for each characteristic parameter of the device in operation,
  • E04: initialization of the number of occurrences

Dans l'exemple, lors des étapes E01 et E03, on mémorise la valeur actuelle de la température du boîtier et de la vitesse du moteur comme valeurs de référence : ces valeurs de références définissent une image précise du dispositif au moment de l'apparition du défaut, image qui sera conservée tout au long du procédé.In the example, during the steps E01 and E03, the current value of the housing temperature and the motor speed are stored as reference values: these reference values define an accurate image of the device at the moment of appearance of the defect, which image will be preserved throughout the process.

Lors des étapes E02 et E03, on initialise la valeur minimum et la valeur maximum de la température avec la température actuelle, et la valeur minimum et la valeur maximum de la vitesse à la valeur actuelle. On a ainsi des premières valeurs minimum / maximum des paramètres, qui pourront être mises à jour ultérieurement.During the steps E02 and E03, the minimum value and the maximum value of the temperature are initialized with the current temperature, and the minimum value and the maximum value of the speed at the current value. We thus have first minimum / maximum values of the parameters, which can be updated later.

Lors de l'étape E04, on initialise un nombre d'occurrences à un. De préférence, ce nombre est initialisé à un lorsque le défaut disparaît, dans l'exemple lorsque le comparateur détecte que la vitesse est suffisamment proche de la vitesse de consigne, à 1% près par exemple. L'initialisation du nombre d'occurrences signifie qu'il y a eu un défaut, qui a disparu. Rappelons que le procédé de l'invention a pour vocation d'enregistrer les conditions d'occurrence d'un défaut intermittent, c'est-à-dire non permanent mais qui se répète.During step E04, a number of occurrences is initialized to one. Preferably, this number is initialized to one when the fault disappears, in the example when the comparator detects that the speed is sufficiently close to the set speed, to 1% for example. Initializing the number of occurrences means that there has been a defect, which has disappeared. Recall that the method of the invention is intended to record the conditions of occurrence of an intermittent defect, that is to say non-permanent but which is repeated.

Ensuite, lors d'une nouvelle occurrence ultérieure du défaut, on réalise une phase de mise à jour, comprenant les étapes suivantes, consistant à :

  • E11 : remplacer la valeur minimum du paramètre par la valeur actuelle du paramètre si la valeur actuelle du paramètre est inférieure à la valeur minimum et / ou remplacer la valeur maximum du dit paramètre par la valeur actuelle du paramètre si la valeur actuelle est supérieure à la valeur maximum précédemment mémorisée.
  • E12 : répétition de l'étape E11 pour chaque paramètre caractéristique du dispositif en fonctionnement.
  • E13 : incrémentation d'un nombre d'occurrences du défaut.
Then, during a new subsequent occurrence of the defect, an updating phase is carried out, comprising the following steps, consisting of:
  • E11: replace the minimum value of the parameter with the current value of the parameter if the current value of the parameter is lower than the minimum value and / or replace the maximum value of the said parameter with the current value of the parameter if the current value is greater than the value of the parameter maximum value previously stored.
  • E12: repetition of step E11 for each characteristic parameter of the device in operation.
  • E13: incrementation of a number of occurrences of the defect.

Dans l'exemple, lors de l'étape E11, on met à jour les valeurs minimum et maximum mémorisées pour la température du boîtier, si nécessaire, c'est-à-dire si la valeur actuelle de la température est inférieure à la valeur minimum ou supérieure à la valeur maximum précédemment mémorisées. Lors de l'étape E12, on met à jour les valeurs minimum et maximum mémorisées pour la vitesse du moteur, si nécessaire, c'est-à-dire si la valeur actuelle de la vitesse est inférieure à la valeur minimum ou supérieure à la valeur maximum précédemment mémorisées.In the example, during step E11, the minimum and maximum values stored for the temperature of the case are updated, if necessary, that is to say if the current value of the temperature is less than the value minimum or greater than the maximum value previously stored. In step E12, the minimum and maximum values stored for the motor speed are updated, if necessary, that is, if the current value of the speed is less than the minimum value or greater than the minimum value. maximum value previously stored.

Lors de l'étape E13, on incrémente de un le nombre d'occurrences. De préférence, ce nombre est initialisé à un lorsque le défaut disparaît, pour les mêmes raisons que précédemment.In step E13, the number of occurrences is incremented by one. Preferably, this number is initialized to one when the fault disappears, for the same reasons as above.

La phase de mise à jour est répétée ensuite autant de fois que nécessaire, à chaque nouvelle occurrence du défaut.The updating phase is then repeated as many times as necessary, at each new occurrence of the defect.

Plus tard, un réparateur cherchant à diagnostiquer et à réparer le défaut viendra consulter la mémoire non volatile, avant d'effacer son contenu.Later, a repairer seeking to diagnose and repair the defect will come to consult the non-volatile memory, before erasing its contents.

L'invention a été développée pour un dispositif de commande du groupe motopropulseur d'un véhicule automobile. Mais elle peut très facilement être étendue à tout calculateur électronique doté de moyens de détection d'un défaut de fonctionnement d'un dispositif et de moyens de mémorisation d'informations relatives à l'apparition du défaut détecté. Dans un véhicule, le dispositif surveillé peut aussi être par exemple un dispositif de commande d'un système de freinage, un dispositif de régulation de vitesse, un dispositif de régulation de température, etc.The invention has been developed for a control device of the powertrain of a motor vehicle. But it can very easily be extended to any electronic computer provided with means for detecting a malfunction of a device and means for storing information relating to the appearance of the detected fault. In a vehicle, the monitored device may also be for example a control device of a braking system, a speed control device, a temperature control device, etc.

Le procédé selon l'invention cumule les avantages des solutions antérieures, et évite leurs inconvénients.The method according to the invention combines the advantages of the prior solutions, and avoids their disadvantages.

Ainsi, avec le procédé selon l'invention, à chaque défaut est associé un ensemble de données de contexte, comprenant outre bien sûr le code défaut correspondant :

  • une indication du nombre d'occurrences du défaut, c'est-à-dire du nombre de fois où le détecteur a détecté la présence du défaut depuis le dernier effacement de la mémoire non volatile du calculateur.
  • pour chaque paramètre caractéristique du défaut, une valeur de référence correspondant à une occurrence particulière du défaut, dans l'exemple décrit la première apparition du défaut (étape E04),
  • pour chaque paramètre caractéristique du défaut, une valeur minimum et une valeur maximum du dit paramètre, ces deux valeurs définissent une plage de valeurs du paramètre dans laquelle le défaut s'est produit.
Thus, with the method according to the invention, each fault is associated with a set of context data, including of course the corresponding fault code:
  • an indication of the number of occurrences of the fault, that is to say the number of times the detector has detected the presence of the fault since the last erasure of the non-volatile memory of the computer.
  • for each characteristic parameter of the fault, a reference value corresponding to a particular occurrence of the fault, in the example describes the first appearance of the fault (step E04),
  • for each characteristic parameter of the fault, a minimum value and a maximum value of said parameter, these two values define a range of values of the parameter in which the fault has occurred.

Ainsi, le réparateur connaît précisément pour chaque défaut mémorisé la zone de fonctionnement dans laquelle ce défaut se produit, et est donc plus à même:

  • d'analyser les causes possibles du défaut. Par exemple, si un défaut électrique se produit entre 2000 et 2500 tr/min, il s'agit très probablement d'un défaut intermittent (mauvais contact d'un connecteur) associé à une fréquence de résonance
  • de valider la justesse et la qualité de sa réparation, par la reproduction lors d'un essai (statique ou dynamique) de ces conditions particulières et par la vérification de la non réapparition du défaut
Thus, the repairer knows precisely for each stored fault the operating zone in which this fault occurs, and is therefore more able to:
  • to analyze the possible causes of the defect. For example, if an electrical fault occurs between 2000 and 2500 rpm, it is most likely an intermittent fault (poor contact of a connector) associated with a resonant frequency
  • to validate the correctness and the quality of its repair, by the reproduction during a test (static or dynamic) of these particular conditions and by the check of the non-recurrence of the defect

Par rapport à la solution antérieure consistant à mémoriser uniquement les valeurs des paramètres du défaut lors d'une occurrence particulière du défaut, la mise en oeuvre du procédé selon l'invention conduit à multiplier par 3 la capacité de la zone de la mémoire non volatile du calculateur allouée au stockage des données de contexte du défaut. En égard d'une part aux gains attendus en terme de facilité et de qualité de la réparation, et d'autre part à la diminution constante et rapide des coûts des composants de type EEPROM, cette multiplication est largement acceptable.Compared to the previous solution of storing only the default parameter values during a particular occurrence of the defect, the implementation of the method according to the invention leads to a 3-fold increase in the capacity of the non-volatile memory area of the computer allocated to the storage of the context data of the defect. Considering, on the one hand, the expected gains in terms of the ease and quality of the repair, and on the other hand the constant and rapid decrease in the costs of the EEPROM components, this multiplication is largely acceptable.

Par rapport à la solution antérieure consistant à mémoriser les valeurs des paramètres du défaut lors d'un nombre limité d'occurrences du défaut, la mise en oeuvre du procédé selon l'invention permet, d'une part de limiter au strict nécessaire la taille de la mémoire utilisée, et d'autre part de conserver toute la richesse des informations emmagasinées au cours de l'utilisation du système. En effet, dans la solution antérieure, la mémorisation des données s'interrompait nécessairement après m détections de la défaillance (limitation due à la taille de la mémoire). Au contraire, dans l'invention, les données sont mises à jour à chaque nouvelle apparition du défaut, quel que soit le nombre d'occurrences du défaut, et cela jusqu'à sa réparation.Compared to the previous solution consisting in storing the values of the defect parameters during a limited number of occurrences of the defect, the implementation of the method according to the invention makes it possible, on the one hand, to limit the size necessary to the minimum necessary. of memory used, and secondly to keep all the wealth of information stored during the use of the system. Indeed, in the previous solution, the storage of the data necessarily stopped after m detections of the failure (limitation due to the size of the memory). In contrast, in the invention, the data are updated at each new occurrence of the defect, regardless of the number of occurrences of the defect, and this until its repair.

Enfin, l'ensemble des données de contexte vues sur l'ensemble des occurrences du défaut (en supposant des ressources de mémoire non volatile illimitées) ne présente pratiquement pas d'intérêt par rapport à la solution proposée par l'invention.Finally, the set of context data seen on all the occurrences of the defect (assuming unlimited nonvolatile memory resources) is practically of no interest compared to the solution proposed by the invention.

En effet, on peut raisonnablement imaginer qu'un réparateur disposant de l'ensemble des données de contexte pour toutes les occurrences du défaut rechercherait immédiatement les plages de valeurs (c'est-à-dire la valeur minimum et la valeur maximum) des paramètres dans lesquelles le défaut se produit afin de déterminer l'origine du défaut. Or, le procédé selon l'invention fournit immédiatement ces plages de valeurs, sans surcoût. En effet, le procédé selon l'invention offre à la fois, du moins dans son mode de mise en oeuvre le plus perfectionné :

  • une "image" précise du dispositif surveillé lors la 1ère détection du défaut
  • une vision de la zone de fonctionnement dans laquelle le défaut se reproduit.
Indeed, it is reasonable to imagine that a repairer having all the context data for all the occurrences of the defect would immediately look for the ranges of values (i.e. the minimum value and the maximum value) of the parameters in which the fault occurs in order to determine the origin of the fault. However, the process according to the invention immediately provides these ranges of values, without additional cost. Indeed, the method according to the invention offers both, at least in its most advanced implementation mode:
  • an "image" specifies the monitored device during the one fault detection era
  • a vision of the operating zone in which the fault recurs.

Claims (5)

  1. Method of recording information concerning a device operating fault, in which information comprising a minimum value and a maximum value of a parameter characteristic of the operation of the device, said characteristic parameter being a piece of context data for the operation of the device, and a number of occurences of said fault are stored in the memory of a computer, characterized in that a phase of updating the stored recordings is carried out, this being performed on an occurrence of the fault and comprising:
    - step E11 consisting in:
    • replacing in the memory the minimum value of the parameter with the current value of the parameter if the current value of the parameter is less than the minimum value, or
    • replacing in the memory the maximum value of said parameter with the current value of the parameter if the current value is greater than the previously recorded maximum value; and
    - step E13 consisting in incrementing a number of occurrences of the fault.
  2. Method according to Claim 1, in which the update phase comprises step E12 performed on the occurrence of the fault and consisting in repeating step E11 for each parameter characteristic of the device in operation.
  3. Method according to either of Claims 1 and 2, during which the steps E11, E12 and/or E13 are repeated on each occurrence of the fault.
  4. Method according to one of Claims 1 to 3, comprising an initialization phase, performed on a first occurrence of the fault and comprising one or more of the following steps, consisting in:
    • E01: initializing a reference value of the parameter with the current value of the parameter,
    • E02: initializing the minimum value of the parameter and the maximum value of the parameter with the current value of the parameter,
    • E03: repeating the step E01 and/or the step E02 for each parameter characteristic of the device in operation,
    • E04: initializing the number of occurrences.
  5. Application of the method according to one of the preceding claims, for the recording of information concerning an operating fault of a drive train of a vehicle.
EP06842063.7A 2005-12-14 2006-11-29 Method for storing data concerning an operating fault of a device Active EP1960652B1 (en)

Applications Claiming Priority (2)

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FR0512640A FR2894695B1 (en) 2005-12-14 2005-12-14 METHOD FOR STORING INFORMATION CONCERNING A FUNCTIONING FAILURE OF A DEVICE
PCT/FR2006/051252 WO2007068836A1 (en) 2005-12-14 2006-11-29 Method for storing data concerning an operating fault of a device

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EP1960652A1 EP1960652A1 (en) 2008-08-27
EP1960652B1 true EP1960652B1 (en) 2016-09-28

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JP (1) JP2009519420A (en)
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WO2007068836A1 (en) 2007-06-21
KR20080084952A (en) 2008-09-22
BRPI0619885A2 (en) 2011-10-25
FR2894695A1 (en) 2007-06-15
FR2894695B1 (en) 2008-08-22
EP1960652A1 (en) 2008-08-27
JP2009519420A (en) 2009-05-14
US7801652B2 (en) 2010-09-21

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