EP2152563B1 - Device for controlling parameter values by reliability analysis and corresponding calculator - Google Patents

Device for controlling parameter values by reliability analysis and corresponding calculator Download PDF

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Publication number
EP2152563B1
EP2152563B1 EP08805815A EP08805815A EP2152563B1 EP 2152563 B1 EP2152563 B1 EP 2152563B1 EP 08805815 A EP08805815 A EP 08805815A EP 08805815 A EP08805815 A EP 08805815A EP 2152563 B1 EP2152563 B1 EP 2152563B1
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Prior art keywords
value
plausible
acquired
acquired value
values
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German (de)
French (fr)
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EP2152563A1 (en
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Claire Malet
Anaïs Renault
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PSA Automobiles SA
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Peugeot Citroen Automobiles SA
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    • 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
    • G07C5/0808—Diagnosing performance data
    • 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
    • G07C3/08—Registering or indicating the production of the machine either with or without registering working or idle time

Definitions

  • the invention relates to the control of the parameter values (s) acquired by sensors, and more precisely the shaping of these parameter values (s) for use, for example by processing functions of a computer .
  • the values of a parameter can sometimes be erroneous. This can for example be the case when a short circuit or an open circuit occurs at a sensor.
  • the computers routinely perform diagnostics based on the parameter values (s) that are acquired by certain sensors. These diagnoses are intended to indicate to the processing functions that use the parameter values (s) acquired, if the latter are erroneous or not.
  • the sensor usually has time to acquire at least one value that is potentially wrong (or false) although plausible since below the diagnostic threshold that marks the beginning of the diagnostic zone. Therefore, a processing function may use a potentially erroneous (though plausible) value before being alerted by the diagnostic function, which may result in events of varying severity.
  • the object of the invention is therefore to propose an alternative, inexpensive and of low complexity, to known solutions for shaping parameter values.
  • a device dedicated to the control of parameter values (s) acquired by means of a sensor according to a predefined acquisition period T A , and comprising loaded control means, when they receive an acquired value. compare this acquired value with a threshold value in order to consider it as plausible, respectively not plausible, if it is lower or respectively greater than a chosen threshold value, and to deliver on an output a reliable (and therefore plausible) acquired value ) prior to the comparative earned value if the latter is plausible, ie a replacement value if this comparative acquired value is implausible.
  • the invention also proposes a computer, capable of performing diagnostics from parameter values (s) controlled, and comprising a device for controlling parameter values (s) of the type presented above.
  • the object of the invention is to enable the formatting of parameter values (s) derived from sensor (s), which are inexpensive and of low complexity.
  • the invention proposes to control by means of a control device D (with a view to formatting) the value of at least one parameter, which is acquired periodically (according to an acquisition period T A ) by a sensor CA at the level of EQ equipment.
  • the equipment EQ is a pedal, for example a motor vehicle.
  • the invention is not limited to this type of equipment. It concerns indeed any type of equipment whose behavior in time is at least partially represented by the value of at least one parameter.
  • the parameter is the position of the pedal EQ.
  • the invention is not limited to this type of parameter. It concerns any type of parameter whose value may vary over time and can be acquired by a CA sensor (whatever the type).
  • the AC sensor delivers periodically (according to the acquisition period T A ) a voltage (in analog form). But, it could also periodically deliver digital data representative of this voltage (or of an intensity, for example).
  • the device D controls (and formats) the values of a single parameter (here a voltage). But, it could control (and format) the values of several (at least two) parameters, possibly from at least two different sensors.
  • device D is part of a CL calculator, which is here embedded in a motor vehicle.
  • This calculator CL comprises for example a processing module MT which implements at least one function using parameter values (s) formatted VM (t) and representative of the operation of one (or more) equipment (s) (or organ (s)) of the motor vehicle.
  • the calculator CL also comprises a diagnostic module MD responsible for performing diagnostics relating to the operation of one or more equipment (or parts) of the motor vehicle, from, in particular, the values of this (these) same parameter (s), before being shaped (hereinafter referred to as VA (t)).
  • a diagnostic module MD responsible for performing diagnostics relating to the operation of one or more equipment (or parts) of the motor vehicle, from, in particular, the values of this (these) same parameter (s), before being shaped (hereinafter referred to as VA (t)).
  • the device D may not be part of the calculator CL. It can indeed be coupled to it, or be part of a CA sensor which it ensures the control and shaping VA values acquired (t). The device D can also be part of the diagnostic module MD.
  • a device D comprises at least one MC control module responsible for intervening each time it receives a value acquired by the CA sensor.
  • the values delivered by the AC sensor are not necessarily transmitted directly to the device D. They can indeed be communicated to it by an intermediate device, after a possible treatment (for example an analog / digital conversion).
  • Each intervention consists firstly in comparing the acquired value received VA (t) with a chosen threshold value VS, in order to determine whether it is plausible or not.
  • a chosen threshold value VS By definition, an acquired value VA (t) is considered plausible when it is lower than the chosen threshold value VS, and an acquired value VA (t) is considered to be implausible when it is greater than VS threshold value chosen.
  • variable t designates the time.
  • the threshold value VS is for example a value that is used by the diagnostic module MD of the calculator CL to detect a failure.
  • the threshold value VS is called the diagnostic threshold.
  • control module MC When the control module MC has determined whether the acquired value received VA (t) is plausible or not plausible, it delivers on an output either a reliable (and therefore plausible) acquired value VA (tN A ) which is prior to this acquired value. VA (t) if the latter is plausible, a replacement value VR if the acquired value VA (t) is implausible.
  • the acquired value VA (t) puts a maximum time T D to reach the threshold value VS and therefore the diagnostic zone in which the diagnostic module MD considers it to be wrong (or false). Therefore, if the last acquired value received VA (t) is in the diagnostic area (and thus estimated not plausible), the N A values previously acquired VA (t-1) ... VA (tN A ) are potentially erroneous (although plausible since lower than the threshold value VS). It is therefore preferable not to deliver as such these potentially erroneous values, although plausible, in order to avoid deceiving the processing module MT.
  • control module MC estimates that the last acquired value received VA (t) is plausible, it replaces it with the reliable acquired value VA (tN A ) which has been received N A acquisition periods T A before she.
  • N A is equal to two acquisition periods T A.
  • the device D In order to be able to perform this type of replacement, the device D must have at each instant N A last acquired values received VA (t-1) ... VA (tN A ). To do this, it can for example store the N A recent acquired values received VA (t-1) ... VA (tN A ) in storage means MS, such as a memory, coupled to its control module MC .
  • the control module MC judges that a (first) acquired value VA (t) is implausible, and that the latter follows a previous acquired value VA (t-1) considered reliable, it may for example replace it with a first replacement value VR1 chosen. Then, if the values VA (t + n) (with n ⁇ 1) that are acquired after this first acquired value VA (t) not plausible are also considered as not plausible, the control module MC may for example replace them with successive replacement values VR which decrease to a chosen value (possibly 0) starting from the first replacement value VR1. It is recalled that a replacement value VR is a parameter value formatted VM (t) which is delivered by the device D on its output when its control module MC estimates that the last acquired value VA (t) that he received is not plausible.
  • a replacement value VR is a parameter value formatted VM (t) which is delivered by the device D on its output when its control module MC estimates that the last acquired value VA (t) that he received is not plausible.
  • the successive replacement values decrease substantially linearly to a chosen value VR2, starting from the replacement value VR1. This amounts to setting up a backup strategy of converging to the replacement value VR2 by means of a ramp.
  • control module MC may be arranged to deliver on the output of the device D a constant replacement value, for example equal to VR1 or to VR2, as long as it receives acquired values VA (t) that it considers not plausible.
  • the device D delivers on its output only reliable values (or robust) and not at the same time reliable values and potentially erroneous but plausible values, which allows, for example, not to mislead the MT processing module.
  • control device D and in particular its control module MC and its possible storage means MS, can be realized in the form of electronic circuits, software (or computer) modules, or a combination of circuits. and software.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Regulating Braking Force (AREA)
  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
  • Safety Devices In Control Systems (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Testing And Monitoring For Control Systems (AREA)
  • Multi Processors (AREA)
  • Hardware Redundancy (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention relates to a device (D) dedicated to the control of the values of at least one parameter acquired by a sensor (CA) during a predetermined acquisition period TA. The device (D) includes control means (MC) for comparing each acquired value to a threshold value in order to consider it as respectively plausible or non-plausible if it is respectively lower or higher than a selected threshold value, and for delivering on an output either a reliable acquired value anterior to the compared acquired value if the latter is plausible, or a replacement value if the compared acquired value is not plausible.

Description

L'invention concerne le contrôle des valeurs de paramètre(s) acquises par des capteurs, et plus précisément la mise en forme de ces valeurs de paramètre(s) en vue de leur utilisation, par exemple par des fonctions de traitement d'un calculateur.The invention relates to the control of the parameter values (s) acquired by sensors, and more precisely the shaping of these parameter values (s) for use, for example by processing functions of a computer .

Comme le sait l'homme de l'art, les valeurs d'un paramètre, qui sont acquises par un capteur, peuvent parfois s'avérer erronées. Cela peut par exemple être le cas lorsqu'un court-circuit ou un circuit ouvert survient au niveau d'un capteur. Afin de détecter ces situations d'erreur, les calculateurs effectuent régulièrement des diagnostics à partir des valeurs de paramètre(s) qui sont acquises par certains capteurs. Ces diagnostics sont destinés à signaler aux fonctions de traitement qui utilisent les valeurs de paramètre(s) acquises, si ces dernières sont erronées ou non.As known to those skilled in the art, the values of a parameter, which are acquired by a sensor, can sometimes be erroneous. This can for example be the case when a short circuit or an open circuit occurs at a sensor. In order to detect these error situations, the computers routinely perform diagnostics based on the parameter values (s) that are acquired by certain sensors. These diagnoses are intended to indicate to the processing functions that use the parameter values (s) acquired, if the latter are erroneous or not.

Or, il peut se passer un certain temps avant qu'un calculateur ne diagnostique une panne ou un dysfonctionnement d'équipement(s) à partir de l'analyse des valeurs de paramètre(s). Cela résulte notamment du fait que la valeur de certains paramètres met un certain temps TD pour rejoindre ce que l'on appelle généralement la zone de diagnostic, zone dans laquelle une valeur de paramètre est considérée comme erronée (ou fausse).However, it may take some time before a computer will diagnose a fault or malfunction of equipment (s) from the analysis of the parameter values (s). This results notably from the fact that the value of certain parameters takes a certain time T D to reach what is generally called the diagnostic zone, zone in which a parameter value is considered to be erroneous (or false).

Pendant ce temps TD le capteur a généralement le temps d'acquérir au moins une valeur qui est potentiellement erronée (ou fausse) bien que plausible puisque inférieure au seuil de diagnostic qui marque le début de la zone de diagnostic. Par conséquent, une fonction de traitement peut utiliser une valeur potentiellement erronée (bien que plausible) avant d'être alertée par la fonction de diagnostic, ce qui peut engendrer des évènements de gravité variable.Meanwhile T D the sensor usually has time to acquire at least one value that is potentially wrong (or false) although plausible since below the diagnostic threshold that marks the beginning of the diagnostic zone. Therefore, a processing function may use a potentially erroneous (though plausible) value before being alerted by the diagnostic function, which may result in events of varying severity.

Afin de limiter ces situations d'erreur, il est possible de mettre en forme les valeurs de paramètre avant qu'elles ne soient utilisées par les fonctions de traitement. Pour ce faire, on peut par exemple utiliser un circuit comportant des composants électroniques mettant en oeuvre une logique booléenne, comme cela est notamment décrit dans les documents brevet FR 2815197 et WO 2004/084070 . On peut également utiliser un circuit chargé de filtrer les signaux représentant les valeurs d'un paramètre, puis de comparer ces signaux filtrés à un seuil dit de détection de défaut de manière à générer un signal d'erreur lorsque le signal filtré est supérieur au seuil, puis à adapter la constante de temps du filtrage et du seuil afin de détecter les erreurs avant que les signaux n'atteignent une limite fonction de la dynamique souhaitée du signal. Cette dernière solution est notamment décrite dans le document brevet US 6,389,338 .To limit these error situations, it is possible to format the parameter values before they are used by the processing functions. For this purpose, it is possible for example to use a circuit comprising electronic components implementing a Boolean logic, as described in particular in patent documents FR 2815197 and WO 2004/084070 . It is also possible to use a circuit responsible for filtering the signals representing the values of a parameter, then for comparing these filtered signals with a so-called fault detection threshold so as to generate an error signal when the filtered signal is greater than the threshold and then adapting the filter and threshold time constant to detect errors before the signals reach a limit depending on the desired signal dynamics. This last solution is notably described in the patent document US 6,389,338 .

L'invention a donc pour but de proposer une alternative, peu onéreuse et de faible complexité, aux solutions connues de mise en forme de valeurs de paramètre(s).The object of the invention is therefore to propose an alternative, inexpensive and of low complexity, to known solutions for shaping parameter values.

Elle propose à cet effet un dispositif, dédié au contrôle de valeurs de paramètre(s) acquises au moyen d'un capteur selon une période d'acquisition prédéfinie TA, et comprenant des moyens de contrôle chargés, lorsqu'ils reçoivent une valeur acquise, de comparer cette valeur acquise à une valeur seuil afin de la considérer comme plausible, respectivement non plausible, si elle est inférieure, respectivement supérieure, à une valeur seuil choisie, et de délivrer sur une sortie soit une valeur acquise fiable (et donc plausible) antérieure à la valeur acquise comparée si cette dernière est plausible, soit une valeur de remplacement si cette valeur acquise comparée est non plausible.It proposes for this purpose a device, dedicated to the control of parameter values (s) acquired by means of a sensor according to a predefined acquisition period T A , and comprising loaded control means, when they receive an acquired value. compare this acquired value with a threshold value in order to consider it as plausible, respectively not plausible, if it is lower or respectively greater than a chosen threshold value, and to deliver on an output a reliable (and therefore plausible) acquired value ) prior to the comparative earned value if the latter is plausible, ie a replacement value if this comparative acquired value is implausible.

On entend ici par « valeur fiable (ou robuste) » une valeur dont on est sûr qu'elle n'est pas potentiellement erronée bien que plausible.Here, "reliable (or robust) value" is a value that we are sure is not potentially wrong, although plausible.

Le dispositif selon l'invention peut comporter d'autres caractéristiques qui peuvent être prises séparément ou en combinaison, et notamment :

  • ses moyens de contrôle peuvent être chargés, lorsque la valeur acquise comparée est plausible, de délivrer sur une sortie une valeur acquise fiable antérieure de NA périodes d'acquisition par rapport à la valeur acquise comparée ;
    • ➢ NA peut par exemple être égal à la valeur arrondie supérieure du rapport entre un temps maximum TD, mis par le capteur en cas de défaillance pour délivrer une valeur acquise supérieure à la valeur seuil, et la période d'acquisition TA ;
  • ses moyens de contrôle peuvent être chargés, lorsqu'une première valeur acquise comparée est non plausible et suit une valeur acquise précédente considérée comme plausible, de délivrer sur la sortie une première valeur de remplacement choisie, puis, si les valeurs acquises postérieurement à cette première valeur acquise non plausible sont également considérées comme non plausibles, de délivrer sur la sortie des valeurs de remplacement successives qui décroissent vers une valeur choisie en partant de la première valeur de remplacement ;
  • en variante, ses moyens de contrôle peuvent être chargés, lorsque la valeur acquise comparée est non plausible, de délivrer sur la sortie une valeur de remplacement constante.
The device according to the invention may comprise other characteristics that can be taken separately or in combination, and in particular:
  • its control means may be charged, when the compared acquired value is plausible, to issue on a disposal a prior reliable acquired value of N A acquisition periods compared to the comparative acquired value;
    • ➢ N A may for example be equal to the upper rounded value of the ratio between a maximum time T D , set by the sensor in the event of a failure to deliver an acquired value greater than the threshold value, and the period T A acquisition;
  • its control means can be loaded, when a first acquired value compared is not plausible and follows a previous acquired value considered plausible, to issue on the output a first replacement value chosen, and then, if the values acquired after this first acquired value not plausible are also considered as not plausible, to issue on the output successive replacement values which decrease to a value chosen starting from the first replacement value;
  • alternatively, its control means can be loaded, when the compared acquired value is not plausible, to deliver on the output a constant replacement value.

L'invention propose également un calculateur, propre à effectuer des diagnostics à partir de valeurs de paramètre(s) contrôlées, et comprenant un dispositif de contrôle de valeurs de paramètre(s) du type de celui présenté ci-avant.The invention also proposes a computer, capable of performing diagnostics from parameter values (s) controlled, and comprising a device for controlling parameter values (s) of the type presented above.

D'autres caractéristiques et avantages de l'invention apparaîtront à l'examen de la description détaillée ci-après, et des dessins annexés, sur lesquels :

  • la figure 1 illustre de façon schématique et fonctionnelle un exemple de calculateur intégrant un exemple de réalisation de dispositif de contrôle selon l'invention couplé à un capteur,
  • la figure 2 est un exemple de diagramme d'évolution temporelle de la valeur d'un paramètre délivrée par un capteur, et
  • la figure 3 est un exemple de diagramme d'évolution temporelle de la valeur de paramètre mise en forme qui est construite par un dispositif de contrôle selon l'invention à partir du diagramme d'évolution temporelle de la figure 2.
Other features and advantages of the invention will appear on examining the detailed description below, and the attached drawings, in which:
  • the figure 1 illustrates schematically and functionally an example of a computer integrating an exemplary embodiment of control device according to the invention coupled to a sensor,
  • the figure 2 is an example of a temporal evolution diagram of the value of a parameter delivered by a sensor, and
  • the figure 3 is an example of a temporal evolution diagram of the formatted parameter value which is constructed by a control device according to the invention from the temporal evolution diagram of the figure 2 .

Les dessins annexés pourront non seulement servir à compléter l'invention, mais aussi contribuer à sa définition, le cas échéant.The attached drawings may not only serve to complete the invention, but also contribute to its definition, if any.

L'invention a pour objet de permettre une mise en forme de valeurs de paramètre(s) issues de capteur(s), peu onéreuse et de faible complexité.The object of the invention is to enable the formatting of parameter values (s) derived from sensor (s), which are inexpensive and of low complexity.

Comme cela est illustré sur la figure 1, l'invention propose de contrôler au moyen d'un dispositif de contrôle D (en vue d'une mise en forme) la valeur d'au moins un paramètre, qui est acquise périodiquement (selon une période d'acquisition TA) par un capteur CA au niveau d'un équipement EQ.As illustrated on the figure 1 , the invention proposes to control by means of a control device D (with a view to formatting) the value of at least one parameter, which is acquired periodically (according to an acquisition period T A ) by a sensor CA at the level of EQ equipment.

Dans ce qui suit, on considère à titre d'exemple non limitatif que l'équipement EQ est une pédale, par exemple de véhicule automobile. Mais, l'invention n'est pas limitée à ce type d'équipement. Elle concerne en effet tout type d'équipement dont le comportement dans le temps est au moins partiellement représenté par la valeur d'au moins un paramètre.In the following, we consider as a non-limiting example that the equipment EQ is a pedal, for example a motor vehicle. But, the invention is not limited to this type of equipment. It concerns indeed any type of equipment whose behavior in time is at least partially represented by the value of at least one parameter.

Par ailleurs, on considère dans ce qui suit, à titre d'exemple non limitatif, que le paramètre est la position de la pédale EQ. Mais, l'invention n'est pas limitée à ce type de paramètre. Elle concerne en effet tout type de paramètre dont la valeur peut varier dans le temps et peut être acquise par un capteur CA (quel qu'en soit le type).Furthermore, it is considered in the following, by way of non-limiting example, that the parameter is the position of the pedal EQ. But, the invention is not limited to this type of parameter. It concerns any type of parameter whose value may vary over time and can be acquired by a CA sensor (whatever the type).

De plus, on considère dans ce qui suit, à titre d'exemple non limitatif, que le capteur CA délivre périodiquement (selon la période d'acquisition TA) une tension (sous forme analogique). Mais, il pourrait également délivrer périodiquement des données numériques représentatives de cette tension (ou bien d'une intensité, par exemple).In addition, it is considered in the following, by way of non-limiting example, that the AC sensor delivers periodically (according to the acquisition period T A ) a voltage (in analog form). But, it could also periodically deliver digital data representative of this voltage (or of an intensity, for example).

On a représenté sur la figure 2 un exemple de diagramme d'évolution temporelle (t) de la valeur de la tension VA(t) qui est délivrée par le capteur CA.We have shown on the figure 2 an example of a time evolution diagram (t) of the value of the voltage VA (t) that is delivered by the sensor CA.

Enfin, on considère dans ce qui suit, à titre d'exemple non limitatif, que le dispositif D contrôle (et met en forme) les valeurs d'un unique paramètre (ici une tension). Mais, il pourrait contrôler (et mettre en forme) les valeurs de plusieurs (au moins deux) paramètres, issus éventuellement d'au moins deux capteurs différents.Finally, it is considered in the following, by way of non-limiting example, that the device D controls (and formats) the values of a single parameter (here a voltage). But, it could control (and format) the values of several (at least two) parameters, possibly from at least two different sensors.

Dans l'exemple non limitatif illustré sur la figure 1, le dispositif D fait partie d'un calculateur CL, qui est ici embarqué dans un véhicule automobile. Ce calculateur CL comprend par exemple un module de traitement MT qui implémente au moins une fonction utilisant des valeurs de paramètre(s) mises en forme VM(t) et représentatives du fonctionnement d'un (ou plusieurs) équipement(s) (ou organe(s)) du véhicule automobile.In the non-limiting example illustrated on the figure 1 , device D is part of a CL calculator, which is here embedded in a motor vehicle. This calculator CL comprises for example a processing module MT which implements at least one function using parameter values (s) formatted VM (t) and representative of the operation of one (or more) equipment (s) (or organ (s)) of the motor vehicle.

Le calculateur CL comprend également un module de diagnostic MD chargé d'effectuer des diagnostics relatifs au fonctionnement d'un ou plusieurs équipements (ou organes) du véhicule automobile, à partir, notamment, des valeurs de ce(s) même(s) paramètre(s), avant leur mise en forme (désignées ci-après VA(t)). Lorsque le module de diagnostic MD détecte une défaillance (ou une erreur), il alerte le module de traitement MT, afin qu'il en tienne compte.The calculator CL also comprises a diagnostic module MD responsible for performing diagnostics relating to the operation of one or more equipment (or parts) of the motor vehicle, from, in particular, the values of this (these) same parameter (s), before being shaped (hereinafter referred to as VA (t)). When the diagnostic module MD detects a failure (or an error), it alerts the processing module MT, so that it takes it into account.

On notera que le dispositif D peut ne pas faire partie du calculateur CL. Il peut en effet être couplé à celui-ci, ou bien faire partie d'un capteur CA dont il assure le contrôle et la mise en forme des valeurs acquises VA(t). Le dispositif D peut également faire partie du module de diagnostic MD.Note that the device D may not be part of the calculator CL. It can indeed be coupled to it, or be part of a CA sensor which it ensures the control and shaping VA values acquired (t). The device D can also be part of the diagnostic module MD.

Un dispositif D selon l'invention comprend au moins un module de contrôle MC chargé d'intervenir chaque fois qu'il reçoit une valeur acquise par le capteur CA. On notera que les valeurs délivrées par le capteur CA ne sont pas forcément transmises directement au dispositif D. Elles peuvent en effet lui être communiquées par un équipement intermédiaire, après un éventuel traitement (par exemple une conversion analogique/numérique).A device D according to the invention comprises at least one MC control module responsible for intervening each time it receives a value acquired by the CA sensor. It should be noted that the values delivered by the AC sensor are not necessarily transmitted directly to the device D. They can indeed be communicated to it by an intermediate device, after a possible treatment (for example an analog / digital conversion).

Chaque intervention consiste tout d'abord à comparer la valeur acquise reçue VA(t) à une valeur seuil VS choisie, afin de déterminer si elle est plausible ou non. Par définition, on considère qu'une valeur acquise VA(t) est plausible lorsqu'elle est inférieure à la valeur seuil VS choisie, et on considère qu'une valeur acquise VA(t) est non plausible lorsqu'elle est supérieure à la valeur seuil VS choisie.Each intervention consists firstly in comparing the acquired value received VA (t) with a chosen threshold value VS, in order to determine whether it is plausible or not. By definition, an acquired value VA (t) is considered plausible when it is lower than the chosen threshold value VS, and an acquired value VA (t) is considered to be implausible when it is greater than VS threshold value chosen.

On comprendra que la variable t désigne ici le temps.It will be understood that the variable t here designates the time.

La valeur seuil VS est par exemple une valeur qui est utilisée par le module de diagnostic MD du calculateur CL pour détecter une défaillance. Dans ce cas, la valeur seuil VS est appelée seuil de diagnostic.The threshold value VS is for example a value that is used by the diagnostic module MD of the calculator CL to detect a failure. In this case, the threshold value VS is called the diagnostic threshold.

Lorsque le module de contrôle MC a déterminé si la valeur acquise reçue VA(t) est plausible ou non plausible, il délivre sur une sortie soit une valeur acquise fiable (et donc plausible) VA(t-NA) qui est antérieure à cette valeur acquise VA(t) si cette dernière est plausible, soit une valeur de remplacement VR si la valeur acquise VA(t) est non plausible.When the control module MC has determined whether the acquired value received VA (t) is plausible or not plausible, it delivers on an output either a reliable (and therefore plausible) acquired value VA (tN A ) which is prior to this acquired value. VA (t) if the latter is plausible, a replacement value VR if the acquired value VA (t) is implausible.

On entend ici par « valeur fiable » une valeur dont on est sûr qu'elle n'est pas potentiellement erronée bien que plausible.Here "reliable value" is understood to mean a value that we are sure is not potentially wrong, although plausible.

En cas de défaillance au niveau du capteur CA, la valeur acquise VA(t) met au maximum un temps TD pour rejoindre la valeur seuil VS et donc la zone de diagnostic dans laquelle le module de diagnostic MD la considère comme erronée (ou fausse). Par conséquent, si la dernière valeur acquise reçue VA(t) est dans la zone de diagnostic (et donc estimée non plausible), les NA valeurs acquises précédentes VA(t-1) ... VA(t-NA) sont potentiellement erronées (bien que plausibles puisque inférieures à la valeur seuil VS). Il est alors préférable de ne pas délivrer telles quelles ces valeurs potentiellement erronées bien que plausibles afin d'éviter de tromper le module de traitement MT.In the event of failure of the AC sensor, the acquired value VA (t) puts a maximum time T D to reach the threshold value VS and therefore the diagnostic zone in which the diagnostic module MD considers it to be wrong (or false). Therefore, if the last acquired value received VA (t) is in the diagnostic area (and thus estimated not plausible), the N A values previously acquired VA (t-1) ... VA (tN A ) are potentially erroneous (although plausible since lower than the threshold value VS). It is therefore preferable not to deliver as such these potentially erroneous values, although plausible, in order to avoid deceiving the processing module MT.

Pour ce faire, si le module de contrôle MC estime que la dernière valeur acquise reçue VA(t) est plausible, il la remplace par la valeur acquise fiable VA(t-NA) qui a été reçue NA périodes d'acquisition TA avant elle.To do this, if the control module MC estimates that the last acquired value received VA (t) is plausible, it replaces it with the reliable acquired value VA (tN A ) which has been received N A acquisition periods T A before she.

Dans ce cas, il est avantageux que NA soit égal à la valeur arrondie supérieure d'un rapport R égal à TD/TA. En d'autres termes, Na est défini par la relation NA = Arr(R) = Arr(TD/TA), où Arr désigne la fonction arrondie à la valeur supérieure.In this case, it is advantageous for N A to be equal to the upper rounded value of a ratio R equal to T D / T A. In other words, Na is defined by the relation N A = Arr (R) = Arr (T D / T A ), where Arr designates the function rounded up.

Comme illustré sur la figure 3, le fait de remplacer chaque dernière valeur acquise VA(t) plausible par la valeur acquise fiable VA(t-NA) qui a été reçue NA périodes d'acquisition TA avant elle, cela revient à décaler de NA périodes d'acquisition TA la partie PN de la courbe d'évolution temporelle des valeurs acquises reçues VA(t), qui regroupe les valeurs acquises reçues VA(t) estimées fiables (et donc plausibles). Dans cet exemple illustré, NA est égal à deux périodes d'acquisition TA.As illustrated on the figure 3 , the fact of replacing each last acquired value VA (t) plausible by the reliable acquired value VA (tN A ) which has been received N A acquisition periods T A before it, this amounts to shifting by N A acquisition periods T At the PN part of the temporal evolution curve of the acquired values received VA (t), which groups the acquired values received VA (t) estimated reliable (and therefore plausible). In this illustrated example, N A is equal to two acquisition periods T A.

Afin de pouvoir effecteur ce type de remplacement, le dispositif D doit disposer à chaque instant des NA dernières valeurs acquises reçues VA(t-1) ... VA(t-NA). Pour ce faire, il peut par exemple stocker les NA dernières valeurs acquises reçues VA(t-1) ... VA(t-NA) dans des moyens de stockage MS, comme par exemple une mémoire, couplés à son module de contrôle MC.In order to be able to perform this type of replacement, the device D must have at each instant N A last acquired values received VA (t-1) ... VA (tN A ). To do this, it can for example store the N A recent acquired values received VA (t-1) ... VA (tN A ) in storage means MS, such as a memory, coupled to its control module MC .

Maintenant, et comme illustré sur la figure 3, lorsque le module de contrôle MC estime qu'une (première) valeur acquise VA(t) est non plausible, et que cette dernière suit une valeur acquise précédente VA(t-1) considérée comme fiable, il peut par exemple la remplacer par une première valeur de remplacement VR1 choisie. Puis, si les valeurs VA(t+n) (avec n≥1) qui sont acquises postérieurement à cette première valeur acquise VA(t) non plausible sont également considérées comme non plausibles, le module de contrôle MC peut par exemple les remplacer par des valeurs de remplacement VR successives qui décroissent vers une valeur choisie (éventuellement 0) en partant de la première valeur de remplacement VR1. Il est rappelé qu'une valeur de remplacement VR est une valeur de paramètre mise en forme VM(t) qui est délivrée par le dispositif D sur sa sortie lorsque son module de contrôle MC estime que la dernière valeur acquise VA(t) qu'il a reçu est non plausible.Now, and as illustrated on the figure 3 when the control module MC judges that a (first) acquired value VA (t) is implausible, and that the latter follows a previous acquired value VA (t-1) considered reliable, it may for example replace it with a first replacement value VR1 chosen. Then, if the values VA (t + n) (with n≥1) that are acquired after this first acquired value VA (t) not plausible are also considered as not plausible, the control module MC may for example replace them with successive replacement values VR which decrease to a chosen value (possibly 0) starting from the first replacement value VR1. It is recalled that a replacement value VR is a parameter value formatted VM (t) which is delivered by the device D on its output when its control module MC estimates that the last acquired value VA (t) that he received is not plausible.

Dans l'exemple illustré sur la figure 3, les valeurs de remplacement successives décroissent de façon sensiblement linéaire vers une valeur choisie VR2, à partir de la valeur de remplacement VR1. Cela revient à mettre en place une stratégie de secours consistant à converger vers la valeur de remplacement VR2 au moyen d'une rampe.In the example shown on the figure 3 , the successive replacement values decrease substantially linearly to a chosen value VR2, starting from the replacement value VR1. This amounts to setting up a backup strategy of converging to the replacement value VR2 by means of a ramp.

Bien entendu, tout autre stratégie de secours peut être utilisée, dès lors qu'elle permet de fournir en sortie du dispositif D une valeur mise en forme VM(t) fiable (ou robuste), ici pour le module de traitement MT du calculateur CL. Ainsi, le module de contrôle MC peut être agencé pour délivrer sur la sortie du dispositif D une valeur de remplacement constante, par exemple égale à VR1 ou bien à VR2, tant qu'il reçoit des valeurs acquises VA(t) qu'il estime non plausibles.Of course, any other back-up strategy can be used, as long as it makes it possible to provide at output of the device D a VM (t) value that is reliable (or robust), here for the processing module MT of the computer CL . Thus, the control module MC may be arranged to deliver on the output of the device D a constant replacement value, for example equal to VR1 or to VR2, as long as it receives acquired values VA (t) that it considers not plausible.

Grâce à l'invention, le dispositif D ne délivre sur sa sortie que des valeurs fiables (ou robustes) et non à la fois des valeurs fiables et des valeurs potentiellement erronées mais plausibles, ce qui permet, par exemple, de ne pas tromper le module de traitement MT.Thanks to the invention, the device D delivers on its output only reliable values (or robust) and not at the same time reliable values and potentially erroneous but plausible values, which allows, for example, not to mislead the MT processing module.

Le dispositif de contrôle D selon l'invention, et notamment son module de contrôle MC et ses éventuels moyens de stockage MS, peuvent être réalisés sous la forme de circuits électroniques, de modules logiciels (ou informatiques), ou d'une combinaison de circuits et de logiciels.The control device D according to the invention, and in particular its control module MC and its possible storage means MS, can be realized in the form of electronic circuits, software (or computer) modules, or a combination of circuits. and software.

L'invention ne se limite pas aux modes de réalisation de dispositif de contrôle et de calculateur décrits ci-avant, seulement à titre d'exemple, mais elle englobe toutes les variantes que pourra envisager l'homme de l'art dans le cadre des revendications ci-après.The invention is not limited to the control device and computer embodiments described above, only by way of example, but encompasses all the variants that can be envisaged by those skilled in the art within the scope of the present invention. claims below.

Claims (6)

  1. Device (D) for controlling parameter values acquired by means of a sensor (CA) during a predetermined acquisition period TA, characterized in that it comprises control means (MC) arranged, in the case of reception of an acquired value, for comparing this acquired value with a threshold value so as to consider it as respectively plausible or non-plausible, if it is respectively lower or higher than a selected threshold value, and for delivering on an output either a reliable acquired value anterior to the said compared acquired value if the latter is plausible, or a replacement value if the compared acquired value is not plausible.
  2. Device according to Claim 1, characterized in that the said control means (MC) are arranged, when the said compared acquired value is plausible, for delivering on an output an anterior reliable acquired value of NA acquisition periods with respect to the said compared acquired value.
  3. Device according to Claim 2, characterized in that NA is equal to the upper rounded value of the ratio between a maximum time TD taken by the said sensor (CA) in the case of failure for delivering an acquired value greater than the said threshold value, and the said acquisition period TA.
  4. Device according to one of Claims 1 to 3, characterized in that the said control means (MC) are arranged, when a first compared acquired value is not plausible and follows a preceding acquired value which is considered as plausible, for delivering on the said output a first selected replacement value, then, if the values acquired subsequently to the said first non-plausible acquired value are also considered to be non-plausible, for delivering on the said output successive replacement values which decrease towards a selected value, starting from the said first replacement value.
  5. Device according to one of Claims 1 to 3, characterized in that the said control means (MC) are arranged, when the said compared acquired value is not plausible, for delivering on the said output a constant replacement value.
  6. Computer (CL) suited to carry out diagnostics from controlled parameter values, characterized in that it comprises a control device (D) according to one of the preceding claims.
EP08805815A 2007-06-06 2008-05-20 Device for controlling parameter values by reliability analysis and corresponding calculator Not-in-force EP2152563B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0755498A FR2917202B1 (en) 2007-06-06 2007-06-06 DEVICE FOR CONTROLLING PARAMETER VALUES (S) BY RELIABILITY ANALYSIS, AND CORRESPONDING CALCULATOR.
PCT/FR2008/050869 WO2009000986A1 (en) 2007-06-06 2008-05-20 Device for controlling parameter values by reliability analysis and corresponding calculator

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EP2152563A1 EP2152563A1 (en) 2010-02-17
EP2152563B1 true EP2152563B1 (en) 2011-04-13

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JP2583468Y2 (en) * 1991-09-13 1998-10-22 光洋精工株式会社 Power steering device
FR2815197B1 (en) * 2000-10-06 2003-01-03 St Microelectronics Sa ASYNCHRONOUS CIRCUIT FOR THE DETECTION AND CORRECTION OF THE INDUCED ERROR AND IMPLEMENTATION METHOD
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FR2917202A1 (en) 2008-12-12
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FR2917202B1 (en) 2009-08-21
EP2152563A1 (en) 2010-02-17
ATE505386T1 (en) 2011-04-15

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