EP3078827A1 - Method for diagnosing a zero flow rate of a motor vehicle coolant - Google Patents

Method for diagnosing a zero flow rate of a motor vehicle coolant Download PDF

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Publication number
EP3078827A1
EP3078827A1 EP16164363.0A EP16164363A EP3078827A1 EP 3078827 A1 EP3078827 A1 EP 3078827A1 EP 16164363 A EP16164363 A EP 16164363A EP 3078827 A1 EP3078827 A1 EP 3078827A1
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EP
European Patent Office
Prior art keywords
valve
diagnosis
conditions
diagnostic
time
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Granted
Application number
EP16164363.0A
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German (de)
French (fr)
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EP3078827B1 (en
Inventor
Christophe Mounetou
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Renault SAS
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Renault SAS
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Publication of EP3078827A1 publication Critical patent/EP3078827A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/14—Indicating devices; Other safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/30—Engine incoming fluid temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2031/00—Fail safe
    • F01P2031/20—Warning devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2070/00—Details
    • F01P2070/06—Using intake pressure as actuating fluid

Definitions

  • the invention relates to a method for diagnosing a zero flow rate of a cooling fluid of a vehicle engine.
  • a diagnostic method according to the invention makes it possible to know simply and with great reliability, the state of circulation of a cooling fluid in a cooling circuit of a vehicle engine.
  • the fault detection step is effective if the divergence is observed over a period of time greater than or equal to a predefined period of time.
  • the diagnosis is made directly on the position of the closing element of the valve and is thus safe and reliable, unlike a diagnosis that would be based on numerical simulations of operating parameters of the valve, as for example a pressure difference.
  • the closing element of the valve can for example be represented by a sliding or rotating flap.
  • the valve can operate in all or nothing, or provide a plurality of intermediate flow rates between zero flow and maximum flow.
  • the engine of the vehicle can be gasoline or diesel.
  • the cooling fluid may for example be constituted by a cooling liquid.
  • this liquid may be water added with an antifreeze, for example glycol water.
  • the step of establishing the diagnosis if said conditions are satisfied is effective over another period of time which is successive to said predefined period of time.
  • the diagnostic method of the invention is carried out for a control valve which is maintained by default in an open position by means of a prestressed member.
  • the computer has an algorithm for comparing the actual position of the valve obtained with the sensor and a control setpoint of said valve.
  • the computer is able to detect a divergence between said actual position and said setpoint over a predefined period of time, to detect a malfunction of the valve.
  • the step of verifying the conditions for carrying out the diagnosis comprises a step of determining three parameters comprising a temperature of the motor, a voltage of a battery supplying a control solenoid valve of the control valve, and an atmospheric pressure.
  • the conditions for establishing the diagnosis are met when each of the parameters is within a predefined range of values.
  • the diagnostic method is implemented by a system for diagnosing the state of circulation of a cooling fluid in a cooling circuit of a vehicle engine, said circuit comprising a control valve having a movable element of closure which can interrupt the flow of the fluid in said circuit, and said system comprising an on-board computer able to control the position of said closure element in the valve, said system comprising a position sensor connected to the closure element and able to send to the calculator a signal representative of the actual position of said element.
  • control valve has a mode of operation in all or nothing.
  • a diagnostic system according to the invention can thus easily and quickly detect a closed position of the valve for which the flow is zero.
  • the position sensor is Hall effect.
  • the valve is maintained by default in an open position by means of a prestressed member. In this way, if no action is taken on the valve, it remains open and lets the coolant through.
  • the computer has an algorithm for comparing the actual position of the valve obtained with the sensor and a control setpoint of said valve, said computer being able to detect a divergence between said actual position and said setpoint over a period of predefined time to detect malfunction of the valve.
  • a diagnostic system comprises means for determining at least one parameter to be chosen from an engine temperature, a battery voltage and a pressure differential for activating a control element of the valve. in order to ensure that the conditions for establishing the diagnosis are verified. Indeed, it should not be that parameters outside the valve and able to affect the operation of said valve, bias the diagnosis, suggesting that it is said valve is down.
  • a diagnostic system makes it possible in particular to detect the closing of a valve 1 of a cooling circuit of a vehicle engine, said circuit operating on the basis of a circulation of a cooling fluid .
  • This cooling circuit comprises a pipe 2 connected to an air gap.
  • the valve 1 has a mode of operation in all or nothing, and is equipped with a movable closing element 3, able to be moved on command between an open position for which the flow rate of fluid in the cooling circuit is maximum , and a closing position for which the flow rate of said fluid in said circuit is zero.
  • a central computing unit 4 controls the displacement of this closure element in the valve 1 between said two positions, via a solenoid valve 5 connected to a battery, and an actuating lung 6 operating on the base a pressure difference, managed by said solenoid valve 5.
  • a transmission element 7 connects the lung 6 to the closure element 3 of the valve 1, said lung 6 controlling the displacement of said closure element 3 via said transmission element 7.
  • a diagnostic system according to the invention comprises a Hall effect sensor 8, connected to the central computing unit 4 and placed at the level of the transmission element 7. This sensor 8 thus sends a signal to the receiver. central processing unit 4, said signal being representative of the position of the closure element 3 in the valve 1.
  • a diagnostic system must be able to detect a malfunction of the valve 1, with respect to a control setpoint of said valve 1, and to affirm that this the defect is due to a malfunction of the valve and not to a parameter outside said valve 1.
  • the solenoid valve 5 driving the actuating lung 6 did not deliver the correct difference of pressure because of a malfunction thereof, the closure element 3 would adopt an erroneous position in the valve 1, which does not correspond to the control setpoint, without the operating mechanism of said valve 1 be called into question.
  • a diagnostic system also comprises means for determining the parameters capable of influencing the position of the closure element 3 in the valve 1, in order to ensure that the conditions of realization of the diagnostics of the proper functioning of the valve 1 are combined.
  • said diagnostic system comprises means for determining at least one parameter to be chosen from a motor temperature, a voltage of the battery to which the solenoid valve 5 is connected, and a pressure difference intended to activate the actuation lung 6.
  • the determination of each of these parameters makes it possible to know if said parameter is in a normal operating range. If so, the conditions for carrying out the diagnosis of good operation of the valve 1 are met. If this is not the case, this diagnosis can not be made.
  • the verification step 9 comprises a step 11 for determining the temperature of the motor, a step 12 for determining the voltage of the battery supplying the solenoid valve 5 and a step 13 for determining the atmospheric pressure, these three parameters must each be within a predefined range of values. If so, the diagnosis of the valve 1 can then be performed.
  • the diagnostic establishment step 10 comprises a step 14 for raising a control setpoint of the valve 1, a step 15 for reading the actual position of the closing element 3 of the valve 1, measured by means of position sensor 8, then a comparison step of these two steps 14, 15 surveys.
  • This comparison step 19 is performed on a predefined first period T2. If a divergence of the readings is observed over this period of time, the comparison continues for a second period t3. If this divergence is still effective over this second period t3, a diagnostic method according to the invention implements a step 20 for detecting a defect of the valve.
  • valve 1 operating in an all-or-nothing mode, a divergence between the readings results either by a detection of the valve 1 in an open position while the control setpoint was a closure of said valve 1, either by a detection of the valve 1 in a closed position, while the control setpoint was an opening of said valve 1.
  • FIG. figure 3 A simplified example of diagnosing a malfunction of valve 1 is shown in FIG. figure 3 .
  • the figure 3a indicates a period of time during which the diagnosis can be made.
  • the figure 3b shows a succession of openings and closures of the valve 1, measured by the position sensor 8, over time.
  • the figure 3c shows a succession of openings and closures of the valve 1, corresponding to the corresponding control setpoint of said valve 1. It is noted that at time t1 there is a divergence between the actual position of the valve 1 and the corresponding instruction . Referring to the figure 3c , a predefined delay is allowed, while maintaining the comparison between the actual position of the valve 1 and the corresponding control setpoint. Referring to the figure 3d If, after the preset time, the divergence is still effective, then the elementary failure of the valve 1 is diagnosed.
  • the figure 2 illustrates an example for which a timer is required to perform the diagnostic. Indeed, certain parameters such as the pressure differential necessary for the activation of the valve 1, take some time to reach a sufficient level, thus creating an artificial divergence between the actual measurement of this pressure differential, and the setpoint driving this pressure differential. It is therefore essential that the functional diagnosis of the valve 1 does not take place during this period of leveling, but only when said sufficient level is reached.
  • the pressure differential is initially zero, then gradually increases until a step to activate the valve 1, then decreases gradually until reaching a zero level.
  • the engine speed is initially zero, corresponding to an engine off or on but not working, then increases regularly corresponding to a use of said engine.
  • the engine speed then reaches a minimum level which is sufficient to ensure enough depression to power the actuators on board the vehicle that require a vacuum for their own control, such as the solenoid valve 5.
  • the engine speed is represented here by a bearing relative to a minimum speed ensuring sufficient vacuum, knowing of course that during operation of the engine, the speed can increase beyond the minimum level.
  • the engine speed then decreases steadily until reaching a zero level, resulting in a non-use of the engine and then a shutdown of said engine.
  • a first period of time during which the diagnosis of operation of the valve 1 can be made begins when the pressure differential of the valve 1 has reached a sufficient value to drive the valve 1, said value corresponding to the observed level on the figure 2a .
  • the pressure differential is not sufficient to be able to control the valve 1 and a diagnostic operation of the valve under these conditions would be meaningless.
  • a second period of time during which the diagnosis of operation of the valve 1 can be made begins when the pressure differential has reached a zero value, truly corresponding to the control setpoint of the valve 1.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

L'invention se rapporte à un procédé de diagnostic d'un débit nul d'un fluide de refroidissement dans un circuit (2) de refroidissement d'un moteur thermique de véhicule, ledit procédé comprenant les étapes suivantes, - une étape de vérification (9) des conditions de réalisation du diagnostic du débit nul du fluide de refroidissement dans le circuit (2) de refroidissement, - une étape d'établissement (10) dudit diagnostic si des conditions sont vérifiées, ladite étape d'établissement (10) consistant en une étape de relevés (14) d'une consigne de pilotage de la vanne (1), une étape de relevés (15) de la position réelle de la vanne (1) au moyen du capteur de position (8), et une étape de comparaison (19) des valeurs obtenues lors de ces deux étapes (14, 15) de relevés, - une étape de détection (20) d'un défaut de fonctionnement de la vanne (1) si une divergence est observée entre ladite position réelle et ladite consigne. Selon le procédé, l'étape de détection (20) du défaut est effective si la divergence est observée sur une période de temps supérieure ou égale à une période de temps prédéfinie.The invention relates to a method for diagnosing a zero flow rate of a cooling fluid in a cooling circuit (2) of a vehicle heat engine, said method comprising the following steps, a step of verifying (9) the conditions for performing the diagnosis of the zero flow rate of the cooling fluid in the cooling circuit (2), a step of setting (10) said diagnosis if conditions are verified, said setting step (10) consisting of a step of reading (14) a control setpoint of the valve (1), a step of readings (15) of the actual position of the valve (1) by means of the position sensor (8), and a step of comparing (19) the values obtained during these two steps (14, 15) of readings, - A step of detecting (20) a malfunction of the valve (1) if a divergence is observed between said actual position and said setpoint. According to the method, the defect detecting step (20) is effective if the divergence is observed over a period of time greater than or equal to a predefined period of time.

Description

L'invention se rapporte à un procédé de diagnostic d'un débit nul d'un fluide de refroidissement d'un moteur de véhicule.The invention relates to a method for diagnosing a zero flow rate of a cooling fluid of a vehicle engine.

Lorsqu'un fluide de refroidissement ne circule plus dans un circuit de refroidissement d'un moteur thermique de véhicule, ledit moteur monte rapidement en température dès qu'il est mis en marche. De cette manière, plus le moteur chauffe rapidement, moins il émet de polluant. Cette interruption de circulation du fluide de refroidissement est certes bénéfique pour l'environnement si elle est maitrisée. En revanche, si elle est accidentelle, elle peut conduire à une surchauffe importante du moteur et donc à une casse de celui-ci. Il s'avère donc fondamental de connaître de façon rigoureuse et sûre, l'état de circulation de ce fluide dans un circuit de refroidissement de moteur, afin de réduire la pollution dans l'environnement et prévenir ce genre de casse.When a cooling fluid no longer circulates in a cooling circuit of a vehicle engine, said engine quickly rises in temperature as soon as it is started. In this way, the faster the motor heats, the less pollutant it emits. This interruption of circulation of the cooling fluid is certainly beneficial for the environment if it is mastered. On the other hand, if it is accidental, it can lead to a significant overheating of the engine and thus to a breakage of it. It is therefore essential to know in a rigorous and safe way, the state of circulation of this fluid in an engine cooling circuit, to reduce pollution in the environment and prevent this kind of breakage.

Un procédé de diagnostic selon l'invention permet de connaître simplement et avec une grande fiabilité, l'état de circulation d'un fluide de refroidissement dans un circuit de refroidissement d'un moteur thermique de véhicule.A diagnostic method according to the invention makes it possible to know simply and with great reliability, the state of circulation of a cooling fluid in a cooling circuit of a vehicle engine.

L'invention a pour objet un procédé de diagnostic d'un débit nul d'un fluide de refroidissement dans un circuit de refroidissement d'un moteur thermique de véhicule au moyen d'un système de diagnostic, ledit circuit comprenant une vanne de régulation ayant un mode de fonctionnement en tout ou rien, et ledit système comprenant, d'une part un calculateur embarqué apte à piloter la position d'un élément de fermeture dans la vanne, et d'autre part un capteur de position relié à l'élément de fermeture et apte à envoyer au calculateur un signal représentatif de la position réelle dudit élément, ledit procédé comprenant les étapes suivantes :

  • une étape de vérification des conditions de réalisation du diagnostic du débit nul du fluide de refroidissement dans le circuit de refroidissement,
  • une étape d'établissement dudit diagnostic si des conditions sont vérifiées, ladite étape d'établissement consistant en une étape de relevés d'une consigne de pilotage de la vanne, une étape de relevés de la position réelle de la vanne au moyen du capteur de position, et une étape de comparaison des valeurs obtenues lors de ces deux étapes de relevés,
  • une étape de détection d'un défaut de fonctionnement de la vanne si une divergence est observée entre ladite position réelle et ladite consigne.
The subject of the invention is a method for diagnosing a zero flow rate of a cooling fluid in a cooling circuit of a vehicle heat engine by means of a diagnostic system, said circuit comprising a control valve having an operating mode in all or nothing, and said system comprising, on the one hand, an on-board computer able to control the position of a closure element in the valve, and on the other hand a position sensor connected to the element closure and able to send to the computer a signal representative of the actual position of said element, said method comprising the following steps:
  • a step of verifying the conditions for performing the diagnosis of the zero flow of the cooling fluid in the cooling circuit,
  • a step of establishing said diagnosis if conditions are verified, said establishing step consisting of a step of recording a control setpoint of the valve, a step of recording the actual position of the valve by means of the sensor of position, and a step of comparison of the values obtained during these two survey steps,
  • a step of detecting a malfunction of the valve if a divergence is observed between said actual position and said setpoint.

Selon l'invention, l'étape de détection du défaut est effective si la divergence est observée sur une période de temps supérieure ou égale à une période de temps prédéfinie.According to the invention, the fault detection step is effective if the divergence is observed over a period of time greater than or equal to a predefined period of time.

Il est en effet important de vérifier que le diagnostic ne peut pas être biaisé par d'autres paramètres, pouvant laisser supposer que l'élément de fermeture de la vanne est dans une position de fermeture, alors qu'il est en réalité dans une position d'ouverture.It is indeed important to verify that the diagnosis can not be biased by other parameters, which may suggest that the closure element of the valve is in a closed position, while in fact in a position opening.

Autrement dit, le diagnostic s'effectue directement sur la position de l'élément de fermeture de la vanne et s'avère donc sûr et fiable, contrairement à un diagnostic qui s'appuierait sur des simulations numériques de paramètres de fonctionnement de la vanne, comme par exemple une différence de pression. L'élément de fermeture de la vanne, peut par exemple être représenté par un volet coulissant ou rotatif. La vanne peut fonctionner en tout ou rien, ou proposer une pluralité de débits intermédiaires compris entre un débit nul et un débit maximal. Le moteur thermique du véhicule peut être à essence ou diesel. Le fluide de refroidissement peut par exemple être constitué par un liquide de refroidissement. Avantageusement, ce liquide peut être de l'eau additionnée d'un antigel, à titre d'exemple de l'eau glycolée.In other words, the diagnosis is made directly on the position of the closing element of the valve and is thus safe and reliable, unlike a diagnosis that would be based on numerical simulations of operating parameters of the valve, as for example a pressure difference. The closing element of the valve can for example be represented by a sliding or rotating flap. The valve can operate in all or nothing, or provide a plurality of intermediate flow rates between zero flow and maximum flow. The engine of the vehicle can be gasoline or diesel. The cooling fluid may for example be constituted by a cooling liquid. Advantageously, this liquid may be water added with an antifreeze, for example glycol water.

Selon le procédé de diagnostic de l'invention, l'étape d'établissement du diagnostic si lesdites conditions sont vérifiées est effective sur une autre période de temps qui est successive à ladite période de temps prédéfinie.According to the diagnostic method of the invention, the step of establishing the diagnosis if said conditions are satisfied is effective over another period of time which is successive to said predefined period of time.

Avantageusement, le procédé de diagnostic de l'invention est réalisé pour une vanne de régulation qui est maintenue par défaut dans une position d'ouverture au moyen d'un organe précontraint.Advantageously, the diagnostic method of the invention is carried out for a control valve which is maintained by default in an open position by means of a prestressed member.

Avantageusement, le calculateur dispose d'un algorithme permettant de comparer la position réelle de la vanne obtenue avec le capteur et une consigne de pilotage de ladite vanne. Le calculateur est apte à détecter une divergence entre ladite position réelle et ladite consigne sur une période de temps prédéfinie, pour déceler un défaut de fonctionnement de la vanne.Advantageously, the computer has an algorithm for comparing the actual position of the valve obtained with the sensor and a control setpoint of said valve. The computer is able to detect a divergence between said actual position and said setpoint over a predefined period of time, to detect a malfunction of the valve.

Avantageusement, l'étape de vérification des conditions de réalisation du diagnostic comprend une étape de détermination de trois paramètres comprenant une température du moteur, une tension d'une batterie alimentant une électrovanne de commande de la vanne de régulation, et une pression atmosphérique.Advantageously, the step of verifying the conditions for carrying out the diagnosis comprises a step of determining three parameters comprising a temperature of the motor, a voltage of a battery supplying a control solenoid valve of the control valve, and an atmospheric pressure.

Avantageusement, les conditions de l'établissement du diagnostic sont réunies lorsque chacun des paramètres est compris dans une plage de valeurs prédéfinie.Advantageously, the conditions for establishing the diagnosis are met when each of the parameters is within a predefined range of values.

Le procédé de diagnostic est mise en oeuvre par un système de diagnostic de l'état de circulation d'un fluide de refroidissement dans un circuit de refroidissement d'un moteur thermique de véhicule, ledit circuit comprenant une vanne de régulation possédant un élément mobile de fermeture pouvant interrompre le débit du fluide dans ledit circuit, et ledit système comportant un calculateur embarqué apte à piloter la position dudit élément de fermeture dans la vanne, ledit système comprenant un capteur de position relié à l'élément de fermeture et apte à envoyer au calculateur un signal représentatif de la position réelle dudit élément.The diagnostic method is implemented by a system for diagnosing the state of circulation of a cooling fluid in a cooling circuit of a vehicle engine, said circuit comprising a control valve having a movable element of closure which can interrupt the flow of the fluid in said circuit, and said system comprising an on-board computer able to control the position of said closure element in the valve, said system comprising a position sensor connected to the closure element and able to send to the calculator a signal representative of the actual position of said element.

Avantageusement, la vanne de régulation à un mode de fonctionnement en tout ou rien. Un système de diagnostic selon l'invention peut ainsi, facilement et rapidement, déceler une position de fermeture de la vanne pour laquelle le débit est nul.Advantageously, the control valve has a mode of operation in all or nothing. A diagnostic system according to the invention can thus easily and quickly detect a closed position of the valve for which the flow is zero.

De façon préférentielle, le capteur de position est à effet Hall.Preferably, the position sensor is Hall effect.

De façon avantageuse, la vanne est maintenue par défaut dans une position d'ouverture au moyen d'un organe précontraint. De cette manière, si aucune action n'est entreprise sur la vanne, celle-ci demeure ouverte et laisse passer le fluide de refroidissement.Advantageously, the valve is maintained by default in an open position by means of a prestressed member. In this way, if no action is taken on the valve, it remains open and lets the coolant through.

Préférentiellement, le calculateur dispose d'un algorithme permettant de comparer la position réelle de la vanne obtenue avec le capteur et une consigne de pilotage de ladite vanne, ledit calculateur étant apte à détecter une divergence entre ladite position réelle et ladite consigne sur une période de temps prédéfinie pour déceler un défaut de fonctionnement de la vanne.Preferably, the computer has an algorithm for comparing the actual position of the valve obtained with the sensor and a control setpoint of said valve, said computer being able to detect a divergence between said actual position and said setpoint over a period of predefined time to detect malfunction of the valve.

Avantageusement, un système de diagnostic, comprend des moyens de détermination d'au moins un paramètre à choisir parmi une température du moteur, une tension d'une batterie et d'un différentiel de pression destiné à activer un élément de commande de la vanne, de manière à s'assurer que les conditions de l'établissement du diagnostic sont vérifiées. En effet, il ne faudrait pas que des paramètres extérieurs à la vanne et aptes à influer sur le fonctionnement de ladite vanne, viennent biaiser le diagnostic, en laissant supposer que c'est ladite vanne qui est en panne.Advantageously, a diagnostic system comprises means for determining at least one parameter to be chosen from an engine temperature, a battery voltage and a pressure differential for activating a control element of the valve. in order to ensure that the conditions for establishing the diagnosis are verified. Indeed, it should not be that parameters outside the valve and able to affect the operation of said valve, bias the diagnosis, suggesting that it is said valve is down.

On donne ci-après, une description détaillée d'un mode de réalisation préféré d'un système et d'un procédé de diagnostic selon l'invention en se référant aux figures 1 à 4.

  • La figure 1 est une vue schématique d'un système de diagnostic selon l'invention,
  • Les figures 2a, 2b, et 2c sont des courbes en fonction du temps illustrant respectivement un exemple de variation d'un différentiel de pression, d'un régime moteur et des phases possibles de diagnostic de débit nul de la vanne,
  • Les figures 3a, 3b, 3c, 3d et 3e sont des courbes en fonction du temps illustrant respectivement un exemple de phase possible de diagnostic de débit nul de la vanne, de variation de la position de la vanne, d'une consigne de pilotage de ladite vanne, d'une phase d'attente, et d'une détection d'un défaut de ladite vanne,
  • La figure 4 est un logigramme illustrant les principales étapes d'un procédé de diagnostic selon l'invention.
The following is a detailed description of a preferred embodiment of a diagnostic system and method according to the invention with reference to the Figures 1 to 4 .
  • The figure 1 is a schematic view of a diagnostic system according to the invention,
  • The Figures 2a, 2b, and 2c are curves as a function of time respectively illustrating an example of variation of a pressure differential, of an engine speed and of the possible stages of diagnosis of the zero flow of the valve,
  • The FIGS. 3a, 3b, 3c, 3d and 3e are curves as a function of time respectively illustrating an example of possible phase of zero flow diagnostic of the valve, variation of the position of the valve, a control setpoint of said valve, a waiting phase, and detecting a fault of said valve,
  • The figure 4 is a logic diagram illustrating the main steps of a diagnostic method according to the invention.

En se référant à la figure 1, un système de diagnostic selon l'invention permet notamment de détecter la fermeture d'une vanne 1 d'un circuit de refroidissement d'un moteur thermique de véhicule, ledit circuit fonctionnant sur la base d'une circulation d'un fluide de refroidissement. De cette manière, lors par exemple d'un démarrage du moteur à froid, on peut être assuré que le débit dudit fluide est nul et que ledit moteur va rapidement monter en température, et ainsi limiter les émissions de polluant dans l'atmosphère. Ce circuit de refroidissement comprend une conduite 2 reliée à un vide d'air. La vanne 1 possède un mode de fonctionnement en tout ou rien, et est équipée d'un élément de fermeture 3 mobile, apte à être déplacé sur commande entre une position d'ouverture pour laquelle le débit de fluide dans le circuit de refroidissement est maximal, et une position de fermeture pour laquelle le débit dudit fluide dans ledit circuit est nul. Une unité centrale de calcul 4 pilote le déplacement de cet élément de fermeture dans la vanne 1 entre lesdites deux positions, par l'intermédiaire d'une électrovanne 5 reliée à une batterie, et d'un poumon 6 d'actionnement fonctionnant sur la base d'une différence de pression, gérée par ladite électrovanne 5. Un élément de transmission 7 relie le poumon 6 à l'élément de fermeture 3 de la vanne 1, ledit poumon 6 commandant le déplacement dudit élément de fermeture 3 via ledit élément de transmission 7. Un système de diagnostic selon l'invention comprend un capteur de position 8 à effet Hall, relié à l'unité centrale de calcul 4 et placé au niveau de l'élément de transmission 7. Ce capteur 8 envoie ainsi un signal à l'unité centrale de calcul 4, ledit signal étant représentatif de la position de l'élément de fermeture 3 dans la vanne 1. Par le biais d'un tel capteur de position 8, il est possible de connaître de façon sûre et fiable la position réelle de l'élément de fermeture 3 dans la vanne 1, et donc de détecter une position de fermeture dudit élément 3 correspondant à un débit nul du fluide dans le circuit de refroidissement.Referring to the figure 1 a diagnostic system according to the invention makes it possible in particular to detect the closing of a valve 1 of a cooling circuit of a vehicle engine, said circuit operating on the basis of a circulation of a cooling fluid . In this way, for example when starting the engine cold, it can be ensured that the flow of said fluid is zero and said engine will quickly rise in temperature, and thus limit emissions of pollutant into the atmosphere. This cooling circuit comprises a pipe 2 connected to an air gap. The valve 1 has a mode of operation in all or nothing, and is equipped with a movable closing element 3, able to be moved on command between an open position for which the flow rate of fluid in the cooling circuit is maximum , and a closing position for which the flow rate of said fluid in said circuit is zero. A central computing unit 4 controls the displacement of this closure element in the valve 1 between said two positions, via a solenoid valve 5 connected to a battery, and an actuating lung 6 operating on the base a pressure difference, managed by said solenoid valve 5. A transmission element 7 connects the lung 6 to the closure element 3 of the valve 1, said lung 6 controlling the displacement of said closure element 3 via said transmission element 7. A diagnostic system according to the invention comprises a Hall effect sensor 8, connected to the central computing unit 4 and placed at the level of the transmission element 7. This sensor 8 thus sends a signal to the receiver. central processing unit 4, said signal being representative of the position of the closure element 3 in the valve 1. By means of such a position sensor 8, it is possible to know in a safe and reliable manner the position re it of the closure element 3 in the valve 1, and thus to detect a closed position of said element 3 corresponding to a zero flow of the fluid in the cooling circuit.

Pour être complet et précis, un système de diagnostic selon l'invention, doit pouvoir permettre de détecter un défaut de fonctionnement de la vanne 1, par rapport à une consigne de pilotage de ladite vanne 1, et affirmer que ce défaut est bien dû à un mauvais fonctionnement de la vanne et non à un paramètre extérieur à ladite vanne 1. En effet, à titre d'exemple, si l'électrovanne 5 pilotant le poumon d'actionnement 6 ne délivrait pas la bonne différence de pression à cause d'un mauvais fonctionnement de celle-ci, l'élément de fermeture 3 adopterait une position erronée dans la vanne 1, qui ne correspondrait pas à la consigne de pilotage, sans pour autant que le mécanisme de fonctionnement de ladite vanne 1 soit remise en cause. Par conséquent, un système de diagnostic selon l'invention, comprend également des moyens de détermination des paramètres capables d'influer sur la position de l'élément de fermeture 3 dans la vanne 1, afin de s'assurer que les conditions de réalisation du diagnostic du bon fonctionnement de la vanne 1 soient réunies. De cette manière, ledit système de diagnostic comprend des moyens de détermination d'au moins un paramètre à choisir parmi une température du moteur, une tension de la batterie à laquelle est reliée l'électrovanne 5, et une différence de pression destinée à activer le poumon d'actionnement 6. En effet, la détermination de chacun de ces paramètres permet de savoir si ledit paramètre se trouve dans une plage normale de fonctionnement. Dans l'affirmative, les conditions de réalisation du diagnostic de bon fonctionnement de la vanne 1 sont réunies. Si ce n'est pas le cas, ce diagnostic ne peut pas être réalisé.To be complete and precise, a diagnostic system according to the invention must be able to detect a malfunction of the valve 1, with respect to a control setpoint of said valve 1, and to affirm that this the defect is due to a malfunction of the valve and not to a parameter outside said valve 1. In fact, for example, if the solenoid valve 5 driving the actuating lung 6 did not deliver the correct difference of pressure because of a malfunction thereof, the closure element 3 would adopt an erroneous position in the valve 1, which does not correspond to the control setpoint, without the operating mechanism of said valve 1 be called into question. Consequently, a diagnostic system according to the invention also comprises means for determining the parameters capable of influencing the position of the closure element 3 in the valve 1, in order to ensure that the conditions of realization of the diagnostics of the proper functioning of the valve 1 are combined. In this way, said diagnostic system comprises means for determining at least one parameter to be chosen from a motor temperature, a voltage of the battery to which the solenoid valve 5 is connected, and a pressure difference intended to activate the actuation lung 6. In fact, the determination of each of these parameters makes it possible to know if said parameter is in a normal operating range. If so, the conditions for carrying out the diagnosis of good operation of the valve 1 are met. If this is not the case, this diagnosis can not be made.

En se référant à la figure 4, un procédé de diagnostic selon l'invention, au moyen d'un système de diagnostic conforme à l'invention, comprend les étapes suivantes,

  • une étape de vérification 9 des conditions de réalisation du diagnostic du débit nul du fluide de refroidissement dans le circuit de refroidissement,
  • une étape d'établissement 10 dudit diagnostic si lesdites conditions sont vérifiées.
Referring to the figure 4 a diagnostic method according to the invention, by means of a diagnostic system according to the invention, comprises the following steps,
  • a verification step 9 of the conditions for performing the diagnosis of the zero flow rate of the cooling fluid in the cooling circuit,
  • a step of establishing said diagnosis if said conditions are verified.

L'étape de vérification 9 comprend une étape 11 de détermination de la température du moteur, une étape 12 de détermination de la tension de la batterie alimentant l'électrovanne 5 et une étape 13 de détermination de la pression atmosphérique, ces trois paramètres devant chacun être compris dans une plage prédéfinie de valeurs. Dans l'affirmative, le diagnostic de la vanne 1 peut alors être réalisé.The verification step 9 comprises a step 11 for determining the temperature of the motor, a step 12 for determining the voltage of the battery supplying the solenoid valve 5 and a step 13 for determining the atmospheric pressure, these three parameters must each be within a predefined range of values. If so, the diagnosis of the valve 1 can then be performed.

L'étape d'établissement 10 du diagnostic comprend une étape de relevé 14 d'une consigne de pilotage de la vanne 1, une étape de relevé 15 de la position réelle de l'élément de fermeture 3 de la vanne 1, mesurée au moyen du capteur 8 de position, puis une étape de comparaison de ces deux étapes 14, 15 de relevés. Cette étape de comparaison 19 s'effectue sur une première période T2 prédéfinie. Si une divergence des relevés est observée sur cette période de temps, la comparaison se poursuit sur une deuxième période t3. Si cette divergence est toujours effective sur cette deuxième période t3, un procédé de diagnostic selon l'invention met en oeuvre une étape de détection 20 d'un défaut de la vanne. Pour rappel, la vanne 1 fonctionnant selon un mode en tout ou rien, une divergence entre les relevés se traduit, soit par une détection de la vanne 1 dans une position ouverte alors que la consigne de pilotage était une fermeture de ladite vanne 1, soit par une détection de la vanne 1 dans une position fermée, alors que la consigne de pilotage était une ouverture de ladite vanne 1.The diagnostic establishment step 10 comprises a step 14 for raising a control setpoint of the valve 1, a step 15 for reading the actual position of the closing element 3 of the valve 1, measured by means of position sensor 8, then a comparison step of these two steps 14, 15 surveys. This comparison step 19 is performed on a predefined first period T2. If a divergence of the readings is observed over this period of time, the comparison continues for a second period t3. If this divergence is still effective over this second period t3, a diagnostic method according to the invention implements a step 20 for detecting a defect of the valve. As a reminder, the valve 1 operating in an all-or-nothing mode, a divergence between the readings results either by a detection of the valve 1 in an open position while the control setpoint was a closure of said valve 1, either by a detection of the valve 1 in a closed position, while the control setpoint was an opening of said valve 1.

Un exemple simplifié de diagnostic d'un défaut de fonctionnement de la vanne 1 est illustré à la figure 3. La figure 3a, indique une période 16 de temps pendant laquelle peut être réalisé le diagnostic. La figure 3b montre une succession d'ouvertures et de fermetures de la vanne 1, mesurées par le capteur 8 de position, au cours du temps. La figure 3c montre une succession d'ouvertures et de fermetures de la vanne 1, correspondant à la consigne de pilotage correspondante de ladite vanne 1. On constate qu'au temps t1 il y a une divergence entre la position réelle de la vanne 1 et la consigne correspondante. En se référant à la figure 3c, on laisse s'écouler un délai prédéfini, en maintenant active la comparaison entre la position réelle de la vanne 1 et la consigne de pilotage correspondante. En se référant à la figure 3d, si au bout du délai prédéfini la divergence est toujours effective, il est alors diagnostiqué une panne élémentaire de la vanne 1.A simplified example of diagnosing a malfunction of valve 1 is shown in FIG. figure 3 . The figure 3a indicates a period of time during which the diagnosis can be made. The figure 3b shows a succession of openings and closures of the valve 1, measured by the position sensor 8, over time. The figure 3c shows a succession of openings and closures of the valve 1, corresponding to the corresponding control setpoint of said valve 1. It is noted that at time t1 there is a divergence between the actual position of the valve 1 and the corresponding instruction . Referring to the figure 3c , a predefined delay is allowed, while maintaining the comparison between the actual position of the valve 1 and the corresponding control setpoint. Referring to the figure 3d If, after the preset time, the divergence is still effective, then the elementary failure of the valve 1 is diagnosed.

La figure 2 illustre un exemple pour lequel une temporisation est nécessaire pour effectuer le diagnostic. En effet, certains paramètres comme par exemple le différentiel de pression nécessaire à l'activation de la vanne 1, mettent un certain temps à atteindre un niveau suffisant, créant ainsi une divergence artificielle entre la mesure réelle de ce différentiel de pression, et la consigne de pilotage de ce différentiel de pression. Il est donc indispensable que le diagnostic de fonctionnement de la vanne 1 ne s'effectue pas durant cette période de mise à niveau, mais uniquement lorsque ledit niveau suffisant est atteint.The figure 2 illustrates an example for which a timer is required to perform the diagnostic. Indeed, certain parameters such as the pressure differential necessary for the activation of the valve 1, take some time to reach a sufficient level, thus creating an artificial divergence between the actual measurement of this pressure differential, and the setpoint driving this pressure differential. It is therefore essential that the functional diagnosis of the valve 1 does not take place during this period of leveling, but only when said sufficient level is reached.

En se référant ainsi à la figure 2a, le différentiel de pression est d'abord nul, puis augmente progressivement jusqu'à atteindre un pallier permettant d'activer la vanne 1, puis décroit progressivement jusqu'à atteindre un niveau nul.Referring to the figure 2a , the pressure differential is initially zero, then gradually increases until a step to activate the valve 1, then decreases gradually until reaching a zero level.

En se référant à la figure 2b, le régime moteur est d'abord nul, correspondant a un moteur éteint ou allumé mais ne fonctionnant pas, puis augmente régulièrement correspondant à une utilisation dudit moteur. Le régime moteur atteint alors un pallier minimal qui est suffisant pour garantir assez de dépression pour alimenter les actuateurs embarqués dans le véhicule qui nécessitent une dépression pour leur propre pilotage, telle l'électrovanne 5 de pilotage. Le régime moteur est représenté ici par un pallier relatif à un régime minimal garantissant suffisamment de dépression, sachant bien entendu que lors du fonctionnement du moteur, le régime peut augmenter au-delà du pallier minimal. Le régime moteur décroit ensuite régulièrement jusqu'à atteindre un niveau nul, traduisant une non utilisation du moteur puis une coupure dudit moteur.Referring to the figure 2b , the engine speed is initially zero, corresponding to an engine off or on but not working, then increases regularly corresponding to a use of said engine. The engine speed then reaches a minimum level which is sufficient to ensure enough depression to power the actuators on board the vehicle that require a vacuum for their own control, such as the solenoid valve 5. The engine speed is represented here by a bearing relative to a minimum speed ensuring sufficient vacuum, knowing of course that during operation of the engine, the speed can increase beyond the minimum level. The engine speed then decreases steadily until reaching a zero level, resulting in a non-use of the engine and then a shutdown of said engine.

En se référant à la figure 2c, une première période 17 de temps au cours de laquelle le diagnostic de fonctionnement de la vanne 1 peut être effectué, commence lorsque le différentiel de pression de la vanne 1 a atteint une valeur suffisante pour piloter la vanne 1, ladite valeur correspondant au pallier observé sur la figure 2a. Avant cette première période 17 de temps, le différentiel de pression n'est pas suffisant pour pouvoir piloter la vanne 1 et un diagnostic de fonctionnement de la vanne dans ces conditions, n'aurait aucun sens. Une deuxième période 18 de temps au cours de laquelle le diagnostic de fonctionnement de la vanne 1 peut être effectué, commence lorsque le différentiel de pression a atteint une valeur nulle, correspondant véritablement à la consigne de pilotage de la vanne 1.Referring to the Figure 2c a first period of time during which the diagnosis of operation of the valve 1 can be made, begins when the pressure differential of the valve 1 has reached a sufficient value to drive the valve 1, said value corresponding to the observed level on the figure 2a . Before this first period of time, the pressure differential is not sufficient to be able to control the valve 1 and a diagnostic operation of the valve under these conditions would be meaningless. A second period of time during which the diagnosis of operation of the valve 1 can be made, begins when the pressure differential has reached a zero value, truly corresponding to the control setpoint of the valve 1.

Claims (6)

Procédé de diagnostic d'un débit nul d'un fluide de refroidissement dans un circuit (2) de refroidissement d'un moteur thermique de véhicule au moyen d'un système de diagnostic, ledit circuit (2) comprenant une vanne (1) de régulation ayant un mode de fonctionnement en tout ou rien, et ledit système comprenant, d'une part un calculateur (4) embarqué apte à piloter la position d'un élément (3) de fermeture dans la vanne (1), et d'autre part un capteur de position (8) relié à l'élément de fermeture (3) et apte à envoyer au calculateur (4) un signal représentatif de la position réelle dudit élément (3), ledit procédé comprenant les étapes suivantes, - une étape de vérification (9) des conditions de réalisation du diagnostic du débit nul du fluide de refroidissement dans le circuit (2) de refroidissement, - une étape d'établissement (10) dudit diagnostic si des conditions sont vérifiées, ladite étape d'établissement (10) consistant en une étape de relevés (14) d'une consigne de pilotage de la vanne (1), une étape de relevés (15) de la position réelle de la vanne (1) au moyen du capteur de position (8), et une étape de comparaison (19) des valeurs obtenues lors de ces deux étapes (14, 15) de relevés, - une étape de détection (20) d'un défaut de fonctionnement de la vanne (1) si une divergence est observée entre ladite position réelle et ladite consigne, caractérisé en ce que l'étape de détection (20) du défaut est effective si la divergence est observée sur une période de temps supérieure ou égale à une période de temps prédéfinie.A method for diagnosing a zero flow of a cooling fluid in a cooling circuit (2) of a vehicle engine by means of a diagnostic system, said circuit (2) comprising a valve (1) of regulation having a mode of operation in all or nothing, and said system comprising, on the one hand, an on-board computer (4) able to control the position of a closing element (3) in the valve (1), and of on the other hand a position sensor (8) connected to the closing element (3) and able to send to the computer (4) a signal representative of the real position of said element (3), said method comprising the following steps, a step of verifying (9) the conditions for performing the diagnosis of the zero flow rate of the cooling fluid in the cooling circuit (2), a step of setting (10) said diagnosis if conditions are verified, said setting step (10) consisting of a step of reading (14) a control setpoint of the valve (1), a step of readings (15) of the actual position of the valve (1) by means of the position sensor (8), and a step of comparing (19) the values obtained during these two steps (14, 15) of readings, a step of detecting (20) a malfunction of the valve (1) if a divergence is observed between said real position and said setpoint, characterized in that the defect detecting step (20) is effective if the divergence is observed over a period of time greater than or equal to a predefined period of time. Procédé de diagnostic selon la revendication 1, caractérisé en ce que l'étape d'établissement (10) du diagnostic si lesdites conditions sont vérifiées est effective sur une autre période de temps qui est successive à ladite période de temps prédéfinie.Diagnostic method according to claim 1, characterized in that the step of establishing (10) the diagnosis if said conditions are satisfied is effective over another period of time which is successive to said predefined period of time. Procédé de diagnostic selon la revendication 1 ou 2, caractérisé en ce qu'il est réalisé pour la vanne (1) de régulation qui est maintenue par défaut dans une position d'ouverture au moyen d'un organe précontraint.Diagnostic method according to claim 1 or 2, characterized in that it is designed for the control valve (1) which is maintained by default in an open position by means of a prestressed member. Procédé de diagnostic selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le calculateur (4) dispose d'un algorithme permettant de comparer la position réelle de la vanne (1) obtenue avec le capteur (8) et une consigne de pilotage de ladite vanne (1), et en ce qu'il est apte à détecter une divergence entre ladite position réelle et ladite consigne sur une période de temps prédéfinie, pour déceler un défaut de fonctionnement de la vanne (1).Diagnostic method according to any one of claims 1 to 3, characterized in that the computer (4) has an algorithm for comparing the actual position of the valve (1) obtained with the sensor (8) and a set driving said valve (1), and in that it is able to detect a divergence between said actual position and said setpoint over a predefined period of time, to detect a malfunction of the valve (1). Procédé de diagnostic selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'étape de vérification (9) des conditions de réalisation du diagnostic comprend une étape de détermination de trois paramètres comprenant une température du moteur, une tension d'une batterie alimentant une électrovanne de commande de la vanne (1) de régulation, et une pression atmosphérique.Diagnostic method according to any one of claims 1 to 4, characterized in that the verification step (9) of the diagnostic realization conditions comprises a step of determining three parameters comprising a motor temperature, a voltage of a battery supplying a control solenoid valve of the control valve (1), and an atmospheric pressure. Procédé de diagnostic selon la revendication 5, caractérisé en ce que les conditions de l'établissement du diagnostic sont réunies lorsque chacun des paramètres est compris dans une plage de valeurs prédéfinie.Diagnostic method according to claim 5, characterized in that the conditions for establishing the diagnosis are met when each of the parameters is within a predefined range of values.
EP16164363.0A 2015-04-09 2016-04-08 Method for diagnosing an opening or closing position of a valve of a cooling circuit of an engine of a vehicle Active EP3078827B1 (en)

Applications Claiming Priority (1)

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FR1553053A FR3034809B1 (en) 2015-04-09 2015-04-09 SYSTEM FOR DIAGNOSING A NULL FLOW OF A COOLING FLUID OF A VEHICLE ENGINE

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003042514A1 (en) * 2001-11-10 2003-05-22 Robert Bosch Gmbh Proportional valve
US20060162677A1 (en) * 2004-12-04 2006-07-27 Mitchell Piddock Internal combustion engine coolant flow
EP2587017A1 (en) * 2011-10-26 2013-05-01 MAN Truck & Bus AG Coolant circuit for a liquid-cooled combustion engine
WO2015030724A1 (en) * 2013-08-27 2015-03-05 Melling Do Brasil Componentes Automotivos Ltda. Temperature control apparatus and method for an automotive cooling system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003042514A1 (en) * 2001-11-10 2003-05-22 Robert Bosch Gmbh Proportional valve
US20060162677A1 (en) * 2004-12-04 2006-07-27 Mitchell Piddock Internal combustion engine coolant flow
EP2587017A1 (en) * 2011-10-26 2013-05-01 MAN Truck & Bus AG Coolant circuit for a liquid-cooled combustion engine
WO2015030724A1 (en) * 2013-08-27 2015-03-05 Melling Do Brasil Componentes Automotivos Ltda. Temperature control apparatus and method for an automotive cooling system

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FR3034809A1 (en) 2016-10-14
FR3034809B1 (en) 2019-04-05

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