EP4127522A1 - Method for diagnosing oil wear of an automatic transmission torque converter of a motor vehicle - Google Patents

Method for diagnosing oil wear of an automatic transmission torque converter of a motor vehicle

Info

Publication number
EP4127522A1
EP4127522A1 EP21712511.1A EP21712511A EP4127522A1 EP 4127522 A1 EP4127522 A1 EP 4127522A1 EP 21712511 A EP21712511 A EP 21712511A EP 4127522 A1 EP4127522 A1 EP 4127522A1
Authority
EP
European Patent Office
Prior art keywords
torque converter
engine
speeds
turbine
com
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21712511.1A
Other languages
German (de)
French (fr)
Inventor
Fabrice Riesenmey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
New H Powertrain Holding SLU
Original Assignee
Renault SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP4127522A1 publication Critical patent/EP4127522A1/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0405—Monitoring quality of lubricant or hydraulic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/14—Inputs being a function of torque or torque demand
    • F16H2059/147—Transmission input torque, e.g. measured or estimated engine torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/36—Inputs being a function of speed
    • F16H2059/366—Engine or motor speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/36—Inputs being a function of speed
    • F16H59/38—Inputs being a function of speed of gearing elements
    • F16H2059/385—Turbine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H41/00—Rotary fluid gearing of the hydrokinetic type
    • F16H41/24—Details
    • F16H41/30—Details relating to venting, lubrication, cooling, circulation of the cooling medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H45/00—Combinations of fluid gearings for conveying rotary motion with couplings or clutches
    • F16H45/02—Combinations of fluid gearings for conveying rotary motion with couplings or clutches with mechanical clutches for bridging a fluid gearing of the hydrokinetic type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/68—Inputs being a function of gearing status
    • F16H59/72—Inputs being a function of gearing status dependent on oil characteristics, e.g. temperature, viscosity

Definitions

  • TITLE Method for diagnosing oil wear in an automatic gearbox torque converter of a motor vehicle
  • the invention relates generally to systems for diagnosing oil wear in hydromechanical transmission systems of automatic gearboxes of motor vehicles.
  • a particularly interesting application of the invention relates to automatic gearboxes comprising a torque converter, for example fitted with a hydraulic torque converter bridging clutch, the English name of which is better known under the name "Lock”. - up ”, or automatic transmissions fitted with a wet double clutch.
  • the invention also applies to any other type of vehicle provided with a clutch system using pressurized oil between a rotary drive element and a driven element, to provide lubrication of the rotating parts or to ensure the tightening of a clutch.
  • Automatic transmissions include a torque converter for transferring energy from the engine output to the vehicle's driveline.
  • FIG. 1 shows a torque converter 1 as well as an engine 2 and the start of the kinematic chain 3.
  • This torque converter 1 comprises an impeller 5 connected to the engine crankshaft 6 and a turbine 7 connected to the kinematic chain. 3.
  • the impeller 5 circulates the pressure-regulated oil 8 in order to set the turbine 7 connected to the kinematic chain in rotation.
  • This system is necessary during sudden braking of the vehicle in order to prevent the vehicle from stalling. to a difference in speed between that of the engine 2 (speed COM), which continues to run, and that of the turbine 7 of torque converter 1 (speed wt), which has greatly slowed down its rotation.
  • speed COM speed COM
  • speed wt speed wt
  • a bridging 10 of the impeller 5 with the turbine 7 is carried out, in order to secure these two parts and to synchronize the engine speed COM with the speed wt of the turbine 7 of the converter. couple 1.
  • This bridging 10 is carried out in the torque converter 1, therefore in contact with the oil 8 present in the converter 1, and more widely present in the gearbox.
  • the role of oil is manifold. It is used to turn the turbine, to lubricate certain parts of the gearbox and to apply certain hydraulic clutches and brakes of the gearbox.
  • the aim of the present invention is therefore to overcome the drawbacks of the aforementioned systems.
  • the object of the invention is therefore a method for diagnosing oil wear in an automatic gearbox torque converter of a motor vehicle comprising a comparison of the speeds of the engine and of the turbine of the torque converter. when the vehicle's torque converter is bridged.
  • comparing the engine speed with that of the torque converter turbine can detect actual oil wear and alert the driver when the oil needs to be changed rather than at mileage. given. This also makes it possible to direct a mechanic when he receives a vehicle whose engine is generating a jerk. This allows him to change the oil knowingly rather than trying to repair the injection system, which is not necessarily damaged.
  • the comparison of the speeds of the engine and of the turbine of the torque converter is carried out if there has been a verification step guaranteeing that the vehicle's torque converter is bypassed, and that the temperature of the oil in the gearbox. speed is greater than a predetermined temperature threshold, and that the engine torque is greater than a predetermined torque threshold.
  • a significant difference in speed between the two speeds is detected if the value of the difference between the two speeds oscillates at a frequency within a predetermined frequency range. during a predetermined period and if the value of the amplitude of the difference between the two regimes exceeds a predetermined value threshold.
  • an oil wear of the torque converter is diagnosed if the number of occurrences of the deviation significant speed between the engine and turbine speeds of the torque converter exceeds a predetermined occurrence threshold during a predetermined period or if the significant deviation continues beyond a predetermined time threshold.
  • an alert signal perceptible by the driver is sent if oil wear in the torque converter has been diagnosed.
  • the alert signal perceptible by the driver is a light signal emitted from the dashboard.
  • at least one driving parameter of the vehicle and at least one parameter for detecting a significant difference in speed between the speeds of the engine and of the turbine of the torque converter used for diagnosing wear of the torque converter are stored.
  • torque converter oil is also an oil wear diagnostic system of an automatic gearbox torque converter of a motor vehicle for the implementation of a method as defined above, comprising means for comparing the speeds of the engine and the turbine of the torque converter when the torque converter of the vehicle is bypassed.
  • FIG 1 which has already been mentioned, illustrates a schematic section of a torque converter of a gearbox implementing a method according to the invention
  • FIG 2 illustrates a flowchart representing the steps of the method according to the invention
  • FIG 3 illustrates a graph showing torque converter engine and turbine speeds as a function of time during transmission oil wear.
  • FIG. 1 a schematic view of an automatic gearbox torque converter 1 implementing a method according to the invention.
  • the torque converter 1 is shown schematically in order to adapt to each type of existing torque converter architecture.
  • a wet double clutch of an automatic gearbox has the essential characteristics of the torque converter necessary for implementing the method according to the invention.
  • clutch systems are similar to the bridging system of a torque converter.
  • the method detects one of the effects of the wear of the oil 8, consisting of a loss of adhesion of the impeller 5 with the turbine 7 when they are bridged. The presence of micro slips between the impeller 5 and the turbine 7 is thus detected when these two elements are bridged, which causes jerks in the COM engine speed.
  • This method is advantageously implemented by an on-board computer of the vehicle which is for this purpose duly programmed to implement each of the steps of the method.
  • the next step 16 is a step of comparing the speed of the COM engine with the speed of the turbine wt. During a perfect bridging, these two speeds COM and wt must be the same since the turbine 7 and the engine 2, via the impeller 5, are interdependent.
  • the engine speed COM oscillates at a speed different from that of the turbine 7.
  • the speed of the latter remains constant thanks to the inertia of the motor vehicle.
  • FIG. 3 There is shown in FIG. 3 a graph having a timescale as abscissa and an angular speed scale as ordinate schematically representing the engine speed COM and the speed of the turbine wt while micro-slips take place. They are demonstrated during step 17, in which a significant difference is detected between the two regimes if the difference in value between the two regimes oscillates at a frequency F included in a predetermined frequency range and if the oscillation s 'performs at least during a predetermined period P, for example for a period P of two hundred milliseconds and for a frequency F between thirty and sixty hertz, and if the amplitude of the difference in value between the two regimes COM and wt exceeds a threshold S of predetermined value, for example of fifty revolutions per minute.
  • a threshold S of predetermined value for example of fifty revolutions per minute.
  • an oil wear 8 present in the torque converter 1 is diagnosed if the number of occurrences of the significant difference between the speeds COM and wt of the engine 2 and of the turbine 7 exceeds one.
  • predetermined occurrence threshold for example ten occurrences, during a predetermined period, for example ten seconds, or if the significant speed deviation continues beyond a predetermined time threshold, for example ten seconds.
  • a warning signal perceptible by the driver is sent during the following step 19. It may, for example, be an indicator light on the instrument panel or an audible signal in the passenger compartment of the vehicle.
  • a notification can also be sent by message, electronic mail, or any other type of telecommunication to a computer terminal of the user, for example the mobile phone of the driver.
  • a step 20 of memorizing at least one of the running parameters of the vehicle and at least one of the parameters for detecting a significant difference in speed between the CO M and wt speeds of the engine and of the turbine used for diagnosing oil wear 8 is carried out by a vehicle computer.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
  • General Details Of Gearings (AREA)

Abstract

The invention relates to a method for diagnosing oil (8) wear of a torque converter (1) of an automatic transmission of a motor vehicle, involving comparing the speeds (ωM; ωT) of the engine (2) and the turbine (7) of the torque converter (1) when the torque converter (1) of the vehicle is bridged.

Description

DESCRIPTION DESCRIPTION
TITRE : Procédé de diagnostic d’une usure d’huile d’un convertisseur de couple de boîte de vitesses automatique d’un véhicule automobile TITLE: Method for diagnosing oil wear in an automatic gearbox torque converter of a motor vehicle
Domaine technique Technical area
L’invention concerne, de manière générale, les systèmes de diagnostic de l’usure de l’huile des systèmes de transmission hydromécanique de boîte de vitesses automatique de véhicule automobile. The invention relates generally to systems for diagnosing oil wear in hydromechanical transmission systems of automatic gearboxes of motor vehicles.
Une application particulièrement intéressante de l’invention concerne les boîtes de vitesses automatiques comprenant un convertisseur de couple, par exemple dotées d’un embrayage hydraulique de pontage de convertisseur de couple, dont la dénomination anglo-saxonne est plus connue sous le nom de « Lock- up », ou les boîtes automatiques dotées d’un double embrayage humide. A particularly interesting application of the invention relates to automatic gearboxes comprising a torque converter, for example fitted with a hydraulic torque converter bridging clutch, the English name of which is better known under the name "Lock". - up ”, or automatic transmissions fitted with a wet double clutch.
Toutefois, l’invention s’applique également à tout autre type de véhicule pourvu d’un système d’embrayage utilisant de l’huile sous pression entre un élément rotatif d’entraînement et un élément entraîné, pour assurer une lubrification des pièces rotatives ou pour assurer le serrage d’un embrayage. However, the invention also applies to any other type of vehicle provided with a clutch system using pressurized oil between a rotary drive element and a driven element, to provide lubrication of the rotating parts or to ensure the tightening of a clutch.
Techniques antérieures Les boîtes de vitesses automatiques comprennent un convertisseur de couple permettant de transférer l’énergie en sortie du moteur vers la chaîne cinématique du véhicule. BACKGROUND ART Automatic transmissions include a torque converter for transferring energy from the engine output to the vehicle's driveline.
On a représenté sur la figure 1 un convertisseur de couple 1 ainsi qu’un moteur 2 et le départ de la chaîne cinématique 3. Ce convertisseur de couple 1 comprend un impulseur 5 relié au vilebrequin moteur 6 et une turbine 7 reliée à la chaîne cinématique 3. L’impulseur 5 fait circuler de l’huile 8 régulée en pression afin de mettre en rotation la turbine 7 reliée à la chaîne cinématique 3. Ce système est nécessaire lors d’un freinage brutal du véhicule pour éviter un calage du véhicule dû à une différence de régime entre celui du moteur 2 (régime COM), qui continue de tourner, et celui de la turbine 7 du convertisseur de couple 1 (régime wt), qui a fortement ralenti sa rotation. Au démarrage, il est également utile car il permet de multiplier le couple moteur et de mettre progressivement la turbine 7 en rotation. Pour des rapports de vitesse plus élevés, le régime wt de la turbine 7 du convertisseur de couple 1 est élevé et se rapproche du régime COM du moteur 2. Cependant, une perte d’énergie a lieu, imputable à rutilisation de l’huile 8. FIG. 1 shows a torque converter 1 as well as an engine 2 and the start of the kinematic chain 3. This torque converter 1 comprises an impeller 5 connected to the engine crankshaft 6 and a turbine 7 connected to the kinematic chain. 3. The impeller 5 circulates the pressure-regulated oil 8 in order to set the turbine 7 connected to the kinematic chain in rotation. This system is necessary during sudden braking of the vehicle in order to prevent the vehicle from stalling. to a difference in speed between that of the engine 2 (speed COM), which continues to run, and that of the turbine 7 of torque converter 1 (speed wt), which has greatly slowed down its rotation. At start-up, it is also useful because it makes it possible to multiply the engine torque and to gradually put the turbine 7 in rotation. For higher gear ratios, the speed wt of the turbine 7 of the torque converter 1 is high and approaches the COM speed of the engine 2. However, energy loss occurs due to the reuse of the oil 8 .
Afin d’éviter cette perte d’énergie inutile, un pontage 10 de l’impulseur 5 avec la turbine 7 est effectué, afin de solidariser ces deux pièces et de synchroniser le régime moteur COM avec le régime wt de la turbine 7 du convertisseur de couple 1. In order to avoid this unnecessary loss of energy, a bridging 10 of the impeller 5 with the turbine 7 is carried out, in order to secure these two parts and to synchronize the engine speed COM with the speed wt of the turbine 7 of the converter. couple 1.
Ce pontage 10 est effectué dans le convertisseur de couple 1, donc en contact avec l’huile 8 présente dans le convertisseur 1, et plus largement présente dans la boîte de vitesses. This bridging 10 is carried out in the torque converter 1, therefore in contact with the oil 8 present in the converter 1, and more widely present in the gearbox.
Cependant, malgré une garantie des constructeurs, on peut constater une usure de l’huile 8 au cours du temps, provoquée par exemple par une pollution de l’huile par des particules en suspension, par exemple des métaux en suspension. L’huile peut également se charger d’humidité, par condensation par exemple, avec pour conséquence une usure, soit une perte de ses caractéristiques mécaniques. Une conduite particulière du véhicule peut également favoriser cette usure. However, despite a manufacturer's warranty, there may be wear of the oil 8 over time, for example caused by pollution of the oil by particles in suspension, for example metals in suspension. The oil can also take on moisture, for example by condensation, resulting in wear or loss of its mechanical characteristics. Particular handling of the vehicle can also promote this wear.
Le rôle de l’huile est multiple. Elle sert à mettre en rotation la turbine, à lubrifier certains éléments de la boîte de vitesses et à serrer certains embrayages et freins hydrauliques de la boîte de vitesses. The role of oil is manifold. It is used to turn the turbine, to lubricate certain parts of the gearbox and to apply certain hydraulic clutches and brakes of the gearbox.
L’impact de cette usure se fait alors ressentir sur la qualité des passages d’un rapport de vitesse à un autre, la durabilité des composants, un encrassage de vannes de modulation de pression, une pollution du système de refroidissement d’huile, ou encore la perte de transmissibilité de couple des embrayages et des freins hydrauliques. The impact of this wear is then felt on the quality of the changes from one gear ratio to another, the durability of the components, clogging of pressure modulation valves, pollution of the oil cooling system, or further loss of torque transmissibility of clutches and hydraulic brakes.
Des dispositifs existants permettent d’alerter le conducteur sur un besoin de vidange mais ne se basent que sur le temps d’utilisation de la boîte de vitesses ou sur un nombre de kilomètres effectués par le véhicule, et non sur des paramètres réels qui influent directement sur l’intégrité du véhicule et de la conduite. Existing devices make it possible to alert the driver to a need for oil change but are based only on the time of use of the gearbox or on the number of kilometers covered by the vehicle. vehicle, and not on actual parameters which directly influence the integrity of the vehicle and the handling.
Exposé de l’invention La présente invention a donc pour but de pallier les inconvénients des systèmes précités. Disclosure of the Invention The aim of the present invention is therefore to overcome the drawbacks of the aforementioned systems.
L’invention a donc pour obj et un procédé de diagnostic d’une usure d’huile d’un convertisseur de couple de boîte de vitesses automatique d’un véhicule automobile comprenant une comparaison des régimes du moteur et de la turbine du convertisseur de couple lorsque le convertisseur de couple du véhicule est ponté. The object of the invention is therefore a method for diagnosing oil wear in an automatic gearbox torque converter of a motor vehicle comprising a comparison of the speeds of the engine and of the turbine of the torque converter. when the vehicle's torque converter is bridged.
Ainsi, la comparaison du régime moteur avec celui de la turbine du convertisseur de couple permet de détecter une usure réelle de l’huile et d’alerter le conducteur au moment où l’huile a besoin d’être changée plutôt qu’à un kilométrage donné. Cela permet également d’aiguiller un garagiste lorsque celui-ci reçoit un véhicule dont le moteur génère un régime à à-coups. Il peut ainsi changer l’huile en connaissance de cause plutôt que d’essayer de réparer le système d’injection, qui lui, n’est pas forcément endommagé. Avantageusement, la comparaison des régimes du moteur et de la turbine du convertisseur de couple est effectuée s’il y a eu une étape de vérification garantissant que le convertisseur de couple du véhicule est ponté, et que la température de l’huile de la boîte de vitesses est supérieure à un seuil de température prédéterminé, et que le couple moteur est supérieur à un seuil de couple prédéterminé. Thus, comparing the engine speed with that of the torque converter turbine can detect actual oil wear and alert the driver when the oil needs to be changed rather than at mileage. given. This also makes it possible to direct a mechanic when he receives a vehicle whose engine is generating a jerk. This allows him to change the oil knowingly rather than trying to repair the injection system, which is not necessarily damaged. Advantageously, the comparison of the speeds of the engine and of the turbine of the torque converter is carried out if there has been a verification step guaranteeing that the vehicle's torque converter is bypassed, and that the temperature of the oil in the gearbox. speed is greater than a predetermined temperature threshold, and that the engine torque is greater than a predetermined torque threshold.
Avantageusement, lors la comparaison des régimes du moteur et de la turbine du convertisseur de couple, on détecte un écart significatif de régime entre les deux régimes si la valeur de la différence entre les deux régimes oscille à une fréquence comprise dans une plage de fréquence prédéterminée durant une période prédéterminée et si la valeur de l’amplitude de la différence entre les deux régimes dépasse un seuil de valeur prédéterminé. Advantageously, when comparing the speeds of the engine and the turbine of the torque converter, a significant difference in speed between the two speeds is detected if the value of the difference between the two speeds oscillates at a frequency within a predetermined frequency range. during a predetermined period and if the value of the amplitude of the difference between the two regimes exceeds a predetermined value threshold.
Avantageusement, on diagnostique une usure d’huile du convertisseur de couple si le nombre d’occurrences de l’écart significatif de régime entre les régimes du moteur et de la turbine du convertisseur de couple dépasse un seuil d’occurrences prédéterminé durant une période prédéterminée ou si l’écart significatif de régime se prolonge au-delà d’un seuil de temps prédéterminé. Avantageusement, on envoie un signal d’alerte perceptible par le conducteur si une usure d’huile du convertisseur de couple a été diagnostiquée. Advantageously, an oil wear of the torque converter is diagnosed if the number of occurrences of the deviation significant speed between the engine and turbine speeds of the torque converter exceeds a predetermined occurrence threshold during a predetermined period or if the significant deviation continues beyond a predetermined time threshold. Advantageously, an alert signal perceptible by the driver is sent if oil wear in the torque converter has been diagnosed.
Avantageusement, le signal d’alerte perceptible par le conducteur est un signal lumineux émis à partir du tableau de bord. Avantageusement, on mémorise au moins un paramètre de roulage du véhicule et au moins un paramètre de détection d’un écart significatif de régime entre les régimes du moteur et de la turbine du convertisseur de couple ayant servi au diagnostic d’une usure de l’huile du convertisseur de couple. L’invention a également pour obj et un système de diagnostic d’usure d’huile d’un convertisseur de couple de boîte de vitesses automatique d’un véhicule automobile pour la mise en œuvre d’un procédé tel que défini ci-dessus, comprenant des moyens de comparaison des régimes du moteur et de la turbine du convertisseur de couple lorsque le convertisseur de couple du véhicule est ponté. Advantageously, the alert signal perceptible by the driver is a light signal emitted from the dashboard. Advantageously, at least one driving parameter of the vehicle and at least one parameter for detecting a significant difference in speed between the speeds of the engine and of the turbine of the torque converter used for diagnosing wear of the torque converter are stored. torque converter oil. The object of the invention is also an oil wear diagnostic system of an automatic gearbox torque converter of a motor vehicle for the implementation of a method as defined above, comprising means for comparing the speeds of the engine and the turbine of the torque converter when the torque converter of the vehicle is bypassed.
Brève description des dessins Brief description of the drawings
D’autres buts, caractéristiques et avantages de l’invention apparaîtront à la lecture de la description suivante, donnée uniquement à titre d’exemple non limitatif, et faite en référence aux dessins annexés sur lesquels : Other aims, characteristics and advantages of the invention will become apparent on reading the following description, given solely by way of non-limiting example, and made with reference to the accompanying drawings in which:
[Fig 1] dont il a déjà été fait mention, illustre une coupe schématique d’un convertisseur de couple d’une boîte de vitesses mettant en œuvre un procédé selon l’invention ; [Fig 2] illustre un organigramme représentant les étapes du procédé selon l’invention ; et [Fig 1] which has already been mentioned, illustrates a schematic section of a torque converter of a gearbox implementing a method according to the invention; [Fig 2] illustrates a flowchart representing the steps of the method according to the invention; and
[Fig 3] illustre un graphique représentant les régimes du moteur et de la turbine du convertisseur de couple en fonction du temps lors d’une usure d’huile de la boîte de vitesses. Exposé détaillé d’au moins un mode de réalisation [Fig 3] illustrates a graph showing torque converter engine and turbine speeds as a function of time during transmission oil wear. Detailed account of at least one embodiment
On a représenté sur la figure 1, dont il a déjà été fait mention, une vue schématique d’un convertisseur de couple 1 de boîte de vitesses automatique mettant en œuvre un procédé selon l’invention. Le convertisseur de couple 1 est présenté de manière schématique afin de s’adapter à chaque type d’architecture de convertisseur de couple existant. De même, un double embrayage humide d’une boîte de vitesses automatique reprend les caractéristiques essentielles du convertisseur de couple nécessaire à la mise en œuvre du procédé selon l’invention. En effet, les systèmes d’embrayages s’apparentent au système de pontage d’un convertisseur de couple. There is shown in Figure 1, which has already been mentioned, a schematic view of an automatic gearbox torque converter 1 implementing a method according to the invention. The torque converter 1 is shown schematically in order to adapt to each type of existing torque converter architecture. Likewise, a wet double clutch of an automatic gearbox has the essential characteristics of the torque converter necessary for implementing the method according to the invention. In fact, clutch systems are similar to the bridging system of a torque converter.
On a représenté figure 2 un organigramme représentant les étapes du procédé selon l’invention. There is shown in Figure 2 a flowchart representing the steps of the method according to the invention.
Le procédé permet de détecter l’un des effets de l’usure de l’huile 8, consistant en une perte d’adhérence de l’impulseur 5 avec la turbine 7 lorsqu’ils sont pontés. On détecte ainsi la présence de micro glissements entre l’impulseur 5 et la turbine 7 lorsque ces deux éléments sont pontés, ce qui provoque des à-coups dans le régime moteur COM. The method detects one of the effects of the wear of the oil 8, consisting of a loss of adhesion of the impeller 5 with the turbine 7 when they are bridged. The presence of micro slips between the impeller 5 and the turbine 7 is thus detected when these two elements are bridged, which causes jerks in the COM engine speed.
Ce procédé est avantageusement mis en œuvre par un calculateur de bord du véhicule qui est à cet effet dûment programmé pour mettre en œuvre chacune des étapes du procédé. This method is advantageously implemented by an on-board computer of the vehicle which is for this purpose duly programmed to implement each of the steps of the method.
Tout d’abord, des conditions sont nécessaires pour réaliser le procédé de diagnostic. La vérification de la présence de ces conditions constitue la première étape 15 du procédé. En premier lieu, le convertisseur de couple 1 doit être ponté. Ensuite, la température de l’huile 8 présente dans la boîte de vitesses doit être supérieure à un seuil de température prédéterminé, par exemple de quatre-vingt-dix degrés Celsius. Et enfin, le couple moteur doit être supérieur à un seuil de couple prédéterminé, par exemple de cent Newton mètre. Tous ces paramètres sont déjà récoltés dans les véhicules automobiles à l’aide de capteurs, et traités dans un calculateur du véhicule. Ils sont donc accessibles pour d’autres utilisations telles que le procédé selon l’invention, effectué par un calculateur. Ces paramètres permettent de garantir les conditions d’apparition de micro-glissements entre l’impulseur 5 et la turbine 7. En effet, l’un des symptômes de ces micro-glissements est une élévation de la température de l’huile 8. Le coefficient de frottement dynamique de l’huile étant modifié lors de son usure, la friction engendrée entre l’impulseur 5 et la turbine 7 dégage de la chaleur. De plus, une telle situation ne survient que si le conducteur demande un couple important au moteur 2. First, conditions are required to perform the diagnostic method. Verifying the presence of these conditions constitutes the first step 15 of the process. First, torque converter 1 must be bridged. Then, the temperature of the oil 8 present in the gearbox must be above a predetermined temperature threshold, for example ninety degrees Celsius. And finally, the engine torque must be greater than a predetermined torque threshold, for example one hundred Newton meters. All these parameters are already collected in motor vehicles using sensors, and processed in a vehicle computer. They are therefore accessible for other uses such as the method according to the invention, carried out by a computer. These parameters make it possible to guarantee the conditions for the appearance of micro-slips between the impeller 5 and the turbine 7. In fact, one of the symptoms of these micro-slips is an increase in the temperature of the oil 8. The dynamic coefficient of friction of the oil being modified during its wear, the friction generated between the impeller 5 and the turbine 7 releases heat. In addition, such a situation only arises if the driver demands a large torque from the motor 2.
L’étape 16 suivante est une étape de comparaison du régime du moteur COM avec le régime de la turbine wt. Lors d’un pontage parfait, ces deux régimes COM et wt doivent être les mêmes puisque la turbine 7 et le moteur 2, via l’impulseur 5, sont solidaires. The next step 16 is a step of comparing the speed of the COM engine with the speed of the turbine wt. During a perfect bridging, these two speeds COM and wt must be the same since the turbine 7 and the engine 2, via the impeller 5, are interdependent.
En revanche, si des micro-glissements ont lieu, le régime moteur COM oscille à un régime différent de celui de la turbine 7. Le régime de cette dernière reste constant grâce à l’inertie du véhicule automobile. On the other hand, if micro-slips take place, the engine speed COM oscillates at a speed different from that of the turbine 7. The speed of the latter remains constant thanks to the inertia of the motor vehicle.
On a représenté figure 3 un graphique ayant pour abscisse une échelle de temps et pour ordonnée une échelle de vitesse angulaire représentant schématiquement le régime moteur COM et le régime de la turbine wt alors que des micro-glissements ont lieu. Ils sont mis en évidence lors de l’étape 17, dans laquelle on détecte un écart significatif entre les deux régimes si la différence de valeur entre les deux régimes oscille à une fréquence F comprise dans une plage de fréquences prédéterminée et si l’oscillation s’effectue au moins durant une période P prédéterminée, par exemple pour une période P de deux-cent millisecondes et pour une fréquence F entre trente et soixante hertz, et si l’amplitude de la différence de valeur entre les deux régimes COM et wt dépasse un seuil S de valeur prédéterminé, par exemple de cinquante tours par minute. There is shown in FIG. 3 a graph having a timescale as abscissa and an angular speed scale as ordinate schematically representing the engine speed COM and the speed of the turbine wt while micro-slips take place. They are demonstrated during step 17, in which a significant difference is detected between the two regimes if the difference in value between the two regimes oscillates at a frequency F included in a predetermined frequency range and if the oscillation s 'performs at least during a predetermined period P, for example for a period P of two hundred milliseconds and for a frequency F between thirty and sixty hertz, and if the amplitude of the difference in value between the two regimes COM and wt exceeds a threshold S of predetermined value, for example of fifty revolutions per minute.
Lors de l’étape 18 suivante, on diagnostique une usure d’huile 8 présente dans le convertisseur de couple 1 si le nombre d’occurrences de l’écart significatif entre les régimes COM et wt du moteur 2 et de la turbine 7 dépasse un seuil d’occurrences prédéterminé, par exemple de dix occurrences, durant une période prédéterminée, par exemple de dix secondes, ou si l’écart significatif de régime se prolonge au-delà d’un seuil de temps prédéterminé, par exemple de dix secondes. During the next step 18, an oil wear 8 present in the torque converter 1 is diagnosed if the number of occurrences of the significant difference between the speeds COM and wt of the engine 2 and of the turbine 7 exceeds one. predetermined occurrence threshold, for example ten occurrences, during a predetermined period, for example ten seconds, or if the significant speed deviation continues beyond a predetermined time threshold, for example ten seconds.
Suite au diagnostic de l’usure d’huile 8, on envoie lors de l’étape 19 suivante un signal d’alerte perceptible par le conducteur. Il peut par exemple s’agir d’un voyant lumineux sur le tableau de bord ou d’un signal sonore dans l’habitacle du véhicule. Une notification peut également être envoyée par message, courrier électronique, ou tout autre type de télécommunication vers un terminal informatique de l’utilisateur, par exemple le téléphone portable du conducteur. Une étape 20 de mémorisation d’au moins l’un des paramètres de roulage du véhicule et d’au moins l’un des paramètres de détection d’un écart significatif de régime entre les régimes COM et wt du moteur et de la turbine ayant servi au diagnostic d’une usure d’huile 8 est effectué par un calculateur du véhicule. Following the diagnosis of oil wear 8, a warning signal perceptible by the driver is sent during the following step 19. It may, for example, be an indicator light on the instrument panel or an audible signal in the passenger compartment of the vehicle. A notification can also be sent by message, electronic mail, or any other type of telecommunication to a computer terminal of the user, for example the mobile phone of the driver. A step 20 of memorizing at least one of the running parameters of the vehicle and at least one of the parameters for detecting a significant difference in speed between the CO M and wt speeds of the engine and of the turbine used for diagnosing oil wear 8 is carried out by a vehicle computer.

Claims

REVENDICATIONS
1. Procédé de diagnostic d’une usure d’huile (8) d’un convertisseur de couple (1) de boîte de vitesses automatique d’un véhicule automobile, caractérisé en ce qu’il comporte une comparaison des régimes (COM ; wt) du moteur (2) et de la turbine (7) du convertisseur de couple (1) lorsque le convertisseur de couple (1) du véhicule est ponté. 1. A method of diagnosing an oil wear (8) of a torque converter (1) of an automatic gearbox of a motor vehicle, characterized in that it comprises a comparison of the speeds (COM; wt ) of the engine (2) and the turbine (7) of the torque converter (1) when the torque converter (1) of the vehicle is bridged.
2. Procédé selon la revendication 1, dans lequel la comparaison des régimes (COM ; wt) du moteur (2) et de la turbine (7) du convertisseur de couple (1) est effectuée s’il y a eu une étape de vérification garantissant que le convertisseur de couple (1) du véhicule est ponté, et que la température de l’huile (8) de la boîte de vitesses est supérieure à un seuil de température prédéterminé, et que le couple moteur est supérieur à un seuil de couple prédéterminé. 2. Method according to claim 1, wherein the comparison of the speeds (CO M ; wt) of the engine (2) and of the turbine (7) of the torque converter (1) is carried out if there has been a step of. verification ensuring that the vehicle's torque converter (1) is bypassed, and that the temperature of the gearbox oil (8) is greater than a predetermined temperature threshold, and that the engine torque is greater than a threshold of predetermined torque.
3. Procédé selon l’une des revendications 1 et 2, dans lequel lors de la comparaison des régimes (COM ; wt) du moteur (2) et de la turbine (7) du convertisseur de couple (1), on détecte un écart significatif de régime entre les deux régimes (COM ; wt) si la valeur de la différence entre les deux régimes (COM ; wt) oscille à une fréquence (F) comprise dans une plage de fréquence prédéterminée durant une période (P) prédéterminée et si la valeur de l’amplitude de la différence entre les deux régimes (COM ; wt) dépasse un seuil (S) de valeur prédéterminé. 3. Method according to one of claims 1 and 2, wherein when comparing the speeds (COM; wt) of the engine (2) and the turbine (7) of the torque converter (1), a deviation is detected. significant speed between the two speeds (COM; wt) if the value of the difference between the two speeds (COM; wt) oscillates at a frequency (F) included in a predetermined frequency range during a predetermined period (P) and if the value of the amplitude of the difference between the two regimes (COM; wt) exceeds a threshold (S) of predetermined value.
4. Procédé selon la revendication 3, dans lequel on diagnostique une usure d’huile (8) du convertisseur de couple (1) si le nombre d’occurrences de l’écart significatif de régime entre les régimes (COM ; wt) du moteur (2) et de la turbine (7) du convertisseur de couple (1) dépasse un seuil d’occurrences prédéterminé durant une période prédéterminée ou si l’écart significatif de régime se prolonge au-delà d’un seuil de temps prédéterminé. 4. Method according to claim 3, in which an oil wear (8) of the torque converter (1) is diagnosed if the number of occurrences of the significant difference in speed between the speeds (COM; wt) of the engine (2) and the turbine (7) of the torque converter (1) exceeds a predetermined threshold of occurrences during a predetermined period or if the significant deviation in speed continues beyond a predetermined time threshold.
5. Procédé selon la revendication 4, dans lequel on envoie un signal d’alerte perceptible par le conducteur si une usure d’huile (8) du convertisseur de couple (1) a été diagnostiquée. 5. The method of claim 4, wherein sending a warning signal perceptible by the driver if oil wear (8) of the torque converter (1) has been diagnosed.
6. Procédé selon la revendication 5, dans lequel le signal d’alerte perceptible par le conducteur est un signal lumineux émis à partir du tableau de bord. 6. The method of claim 5, wherein the alert signal perceptible by the driver is a light signal emitted from the instrument panel.
7. Procédé selon la revendication 4, dans lequel on mémorise au moins un paramètre de roulage du véhicule et au moins un paramètre de détection d’un écart significatif de régime entre les régimes (COM ; wt) du moteur (2) et de la turbine (7) du convertisseur de couple (1) ayant servi au diagnostic d’une usure de l’huile (8) du convertisseur de couple (1). 7. The method of claim 4, wherein at least one driving parameter of the vehicle and at least one parameter for detecting a significant difference in speed between the speeds (COM; wt) of the engine (2) and the speed are stored. turbine (7) of the torque converter (1) having served to diagnose a wear of the oil (8) of the torque converter (1).
8. Système de diagnostic d’usure d’huile (8) d’un convertisseur de couple (1) de boîte de vitesses automatique d’un véhicule automobile pour la mise en œuvre d’un procédé selon l’une des revendications 1 à 7 caractérisé en ce qu’il comprend des moyens de comparaison des régimes (COM ; wt) du moteur (2) et de la turbine (7) du convertisseur de couple (1) lorsque le convertisseur de couple (1) du véhicule est ponté. 8. Oil wear diagnostic system (8) of a torque converter (1) of an automatic gearbox of a motor vehicle for the implementation of a method according to one of claims 1 to 7 characterized in that it comprises means for comparing the speeds (COM; wt) of the engine (2) and of the turbine (7) of the torque converter (1) when the torque converter (1) of the vehicle is bridged .
EP21712511.1A 2020-03-24 2021-03-18 Method for diagnosing oil wear of an automatic transmission torque converter of a motor vehicle Pending EP4127522A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR2002875A FR3108700B1 (en) 2020-03-24 2020-03-24 Method for diagnosing oil wear in an automatic gearbox torque converter of a motor vehicle
PCT/EP2021/056992 WO2021191050A1 (en) 2020-03-24 2021-03-18 Method for diagnosing oil wear of an automatic transmission torque converter of a motor vehicle

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EP4127522A1 true EP4127522A1 (en) 2023-02-08

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CN (1) CN115485491A (en)
BR (1) BR112022019314A2 (en)
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JP3541048B2 (en) * 1993-09-07 2004-07-07 トヨタ自動車株式会社 Automatic transmission hydraulic control circuit
JP4038000B2 (en) * 2000-05-31 2008-01-23 ジヤトコ株式会社 Lock-up control device
JP4409927B2 (en) * 2003-12-09 2010-02-03 本田技研工業株式会社 Hydraulic oil change display for automatic transmission
DE102006027436A1 (en) * 2006-06-12 2007-12-13 Conti Temic Microelectronic Gmbh Control or regulation of an automatic or automated transmission
KR20110011442A (en) * 2009-07-28 2011-02-08 콘티넨탈 오토모티브 시스템 주식회사 Automatic transmission oil change timing estimation system and automatic transmission oil change timing estimation method
US10553043B2 (en) * 2017-03-01 2020-02-04 GM Global Technology Operations LLC Method and apparatus for predicting operating health of a torque converter clutch

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BR112022019314A2 (en) 2022-11-16
CN115485491A (en) 2022-12-16
FR3108700A1 (en) 2021-10-01
WO2021191050A1 (en) 2021-09-30
FR3108700B1 (en) 2022-02-25

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