EP2464956A1 - Procédé de détection précoce de dommages dans une transmission de véhicule automobile - Google Patents

Procédé de détection précoce de dommages dans une transmission de véhicule automobile

Info

Publication number
EP2464956A1
EP2464956A1 EP10734101A EP10734101A EP2464956A1 EP 2464956 A1 EP2464956 A1 EP 2464956A1 EP 10734101 A EP10734101 A EP 10734101A EP 10734101 A EP10734101 A EP 10734101A EP 2464956 A1 EP2464956 A1 EP 2464956A1
Authority
EP
European Patent Office
Prior art keywords
motor vehicle
vehicle transmission
damage
acceleration
electrical signal
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.)
Withdrawn
Application number
EP10734101A
Other languages
German (de)
English (en)
Inventor
Jörg KURTH
Hubert KÖNIG
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.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of EP2464956A1 publication Critical patent/EP2464956A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
    • G01H1/003—Measuring characteristics of vibrations in solids by using direct conduction to the detector of rotating machines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • G01M13/02—Gearings; Transmission mechanisms
    • G01M13/021—Gearings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • G01M13/02—Gearings; Transmission mechanisms
    • G01M13/028—Acoustic or vibration analysis

Definitions

  • the invention relates to a method for the early detection of damage in a motor vehicle transmission, which comprises at least one acceleration sensor, are detected by which mechanical vibrations in the motor vehicle transmission and converted into an electrical signal, the electrical signal is then digitized and in the further course a comparison with a Comparative size is made.
  • the invention further relates to a motor vehicle transmission, in which damage can be determined by this method, as well as a computer program product for carrying out the individual method steps.
  • Transmission control systems of modern motor vehicle transmissions frequently have diagnostic devices which can be used to avoid further consequential damage to other components by initiating appropriate measures, for example by forcing a lower transmission input speed.
  • sensors are also used, via which vibrations in the motor vehicle transmission can be detected, which represent an indication of damage to a transmission component in the case of heavy rashes. By monitoring the vibrations damage can thus be detected early and thus eliminated at an earlier date, so that the risk of serious damage occurring can be reduced.
  • the invention comprises the technical teaching that a detection of the mechanical vibrations in the motor vehicle transmission to defined operational is carried out points and determined from the digitized, electrical signal acceleration excursions over a time course. Furthermore, states are counted in which the acceleration excursions exceed a comparison quantity, whereby a calculated probability for a damage of the motor vehicle transmission is determined on the basis of the number of states.
  • damage in the motor vehicle transmission can be determined with a low computational outlay and thus also be used with smaller memory and lower computing power. Because the generated and then digitized acceleration signals must not first be transformed by means of a Fourier transform in the frequency domain and then transferred by means of a cepstrum analysis again in the time domain, but are compared directly with an associated comparison variable. Since this takes place only at certain operating points of the motor vehicle transmission, in which a good comparability with a reference variable is possible, it is possible to determine deviations between the detected accelerations, ie the mechanical vibrations in the transmission, and the respective reference with sufficient accuracy.
  • a determination the states by comparison of acceleration gradient with a limit and on the basis of a subsequent detection of increased acceleration gradients in the electrical signal carried out.
  • at least one slope limiter is used in this case, through which physically not possible gradients are filtered out.
  • the additional monitoring of acceleration gradients in the signal can increase the accuracy of detection of damage.
  • the use of at least one gradient limiter does not take account of gradients which, physically speaking, can not occur in the transmission.
  • the calculated probability is increased by each detected state, while time intervals without detected states cause a reduction of the probability.
  • the calculated probability is compared with a threshold value above which a damage of the motor vehicle transmission is declared.
  • a declaration of damage is recorded and / or displayed on a display.
  • the system draws conclusions about damage and records this accordingly.
  • the driver it is conceivable for the driver to detect the fault on a display, possibly in Form of a shortened maintenance interval, notify.
  • this damage detection can also be included in a fault memory of the control electronics of the motor vehicle and displayed to the customer service at a next maintenance interval to initiate a targeted review.
  • the defined operating points are formed by characteristic operating ranges, in which usually low mechanical vibrations of the motor vehicle transmission predominate.
  • the solution according to the invention can also be embodied as a computer program product which, when running on a processor of a transmission control of the motor vehicle transmission, instructs the processor by software to carry out the associated process steps according to the invention.
  • a computer-readable medium is the subject of the invention, on which a computer program product described above is stored retrievably.
  • FIG. 2 shows the time profile of an acceleration signal
  • FIG. 3 shows a plurality of diagrams from which the states that have occurred, the generation of a calculated probability, as well as a damage declaration over a time course emerge.
  • Detects vibrations in a motor vehicle transmission by at least one acceleration sensor which is placed in the range of transmission components whose operation is to be monitored.
  • the detected mechanical vibrations are converted by the at least one acceleration sensor into an electrical signal a (t), which is digitized in a subsequent step S3.
  • Acceleration deflections obtained from the signal a (t) are compared with a comparison quantity a G in a step S4 which is connected thereto.
  • acceleration gradients ⁇ a (t) in the signal a (t) are determined and compared with a limit value ⁇ aG.
  • at least one slope limiter is used by which physically impossible values are sorted out.
  • FIG. 2 shows an exemplary course of a signal a (t) over time t.
  • an amplitude range spanned by the comparison variable a G is exceeded during a measurement time t M at three times due to increased acceleration excursions. These Exceedances are recorded by the system.
  • the determination of the associated acceleration gradients ⁇ a (t) is shown by way of example in the region of the first exceeding of the comparison variable aG.
  • Continuous mechanical vibrations indicate impending failures of transmission components. Damage to bearings, gears and synchronizers, for example, causes noise and thus mechanical vibrations that can be detected by the accelerometer.
  • the detection and the comparison with the comparison quantity aG, as well as the limit value .DELTA.a G is thereby performed at operating points of the motor vehicle transmission, in which usually a smooth running and no load changes are to be expected. In this case, the measuring time t M must be adjusted so far that a reliable statement regarding mechanical vibrations can be achieved.
  • step S4 If it is determined in step S4 that the comparison variable a G or the limit value ⁇ aG is exceeded, the number of states Z (t) at which these exceedances are recorded is counted in a subsequent step S5. Then, according to the number of states Z (t), the value of a calculated probability P (t) is increased. Following this, a further step S6 is entered. On the other hand, if the comparison in step S4 is to be answered in the negative, then the process goes directly to step S6. This queries whether the calculated probability P (t) has exceeded a threshold value Ps. If an overshoot is detected, a damage of the motor vehicle transmission is declared in a subsequent step S7 and this declaration is issued.
  • step S7 a step S8 is proceeded in which the calculated probability P (t) is reduced again.
  • step S8 is also transferred directly from step S6, if no exceeding of the threshold Ps has been detected. Following step S8, it then jumps back to step S1 and traverses the process chain anew.
  • the reduction of the calculated probability P (t) in step S8 has the consequence that only continuously occurring exceedances of the comparison variable a G or the limit value ⁇ a G lead to a continuous increase in the calculated probability P (t).
  • states Z (t) are detected with exceedances of the quantities a G and ⁇ a G and then the calculated probability P (t) is increased, after a further absence of these events
  • the calculated probability P (t) is again reduced step by step so that no damage decay is triggered when a further single event occurs in the sequence of the measurement.
  • FIG. 3 shows exemplary time profiles of the determined states Z (t), the calculated probability P (t) and the detection of a damage in the motor vehicle transmission with one another.
  • states Z (t) at which the acceleration signal a (t) the comparison variable a G or acceleration gradients ⁇ a (t) in the signal a (t) have exceeded the limit value ⁇ a G are illustrated by vertical lines.
  • the calculated probability P (t) is then increased, as can be seen from the diagram arranged immediately below.
  • the time interval between them which is interrupted here, is long enough for the probability P (t) to be reduced again in steps and not to exceed the threshold value Ps.
  • a signal of detected transmission damage in the lowermost diagram also remains at a value O, which means that damage of the automotive transmission is deemed unlikely.
  • the detected states Z (t) follow each other so quickly in terms of time that the calculated probability P (t) exceeds the threshold value P s . This has the consequence that the signal curve in the bottom diagram is changed to the value 1, which represents a high probability of transmission damage. As a result, a corresponding damage claim is issued.
  • Designation S1 - S8 Process steps a (t) Signal

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

L'invention concerne un procédé de détection précoce de dommages dans une transmission de véhicule automobile qui comprend au moins un capteur d'accélération qui détecte (S1) des vibrations mécaniques dans la transmission de véhicule automobile et les convertit (S2) en un signal électrique (a(t)). Le signal électrique (a(t)) est ensuite numérisé (S3) et par la suite un alignement est effectué avec une grandeur de comparaison (aG). En outre, la détection des vibrations mécaniques s'effectue sur des points définis de la transmission de véhicule automobile et le signal électrique numérisé (a(t)) permet de déterminer des excursions d'accélération sur l'allure du signal dans le temps (t). Le procédé compte les états (Z(t)) où les excursions d'accélération dépassent la grandeur de comparaison (aG). En fonction du nombre des états (Z(t)), une probabilité calculée (P(t)) d'un dommage de la transmission de véhicule automobile est déterminée (S5). L'invention concerne en outre une transmission de véhicule automobile dont l'endommagement peut être déterminé à l'aide du procédé ci-dessus, ainsi qu'un progiciel d'ordinateur pour l'exécution des différentes étapes du procédé.
EP10734101A 2009-08-10 2010-07-14 Procédé de détection précoce de dommages dans une transmission de véhicule automobile Withdrawn EP2464956A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009028364A DE102009028364A1 (de) 2009-08-10 2009-08-10 Verfahren zur frühzeitigen Schadenserkennung in einem Kraftfahrzeuggetriebe
PCT/EP2010/060100 WO2011018289A1 (fr) 2009-08-10 2010-07-14 Procédé de détection précoce de dommages dans une transmission de véhicule automobile

Publications (1)

Publication Number Publication Date
EP2464956A1 true EP2464956A1 (fr) 2012-06-20

Family

ID=42768145

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10734101A Withdrawn EP2464956A1 (fr) 2009-08-10 2010-07-14 Procédé de détection précoce de dommages dans une transmission de véhicule automobile

Country Status (6)

Country Link
US (1) US20120130607A1 (fr)
EP (1) EP2464956A1 (fr)
JP (1) JP2013501927A (fr)
CN (1) CN102472684A (fr)
DE (1) DE102009028364A1 (fr)
WO (1) WO2011018289A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5743996B2 (ja) * 2012-11-06 2015-07-01 ジヤトコ株式会社 自動変速機の異常判定装置および異常判定方法
WO2014116197A1 (fr) 2013-01-22 2014-07-31 Hewlett-Packard Development Company, L.P. Détermination d'une mesure corrective pour un véhicule motorisé sur la base d'une vibration détectée
FR3011927B1 (fr) * 2013-10-10 2015-12-04 Peugeot Citroen Automobiles Sa Dispositif d’alerte de maintenance pour un vehicule
CN104949833B (zh) * 2015-06-12 2018-01-02 重庆长安汽车股份有限公司 一种变速器抖动原因确认装置及方法
DE102017201101A1 (de) * 2017-01-24 2018-07-26 Zf Friedrichshafen Ag Verfahren und Vorrichtung zum Betreiben eines Displays
CN108466303A (zh) * 2018-05-25 2018-08-31 浙江益医疗器械有限公司 一种整形美容用锯齿线自动切线机

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US3677072A (en) * 1970-10-30 1972-07-18 Gen Electric Damage detection method and apparatus for machine elements utilizing vibrations therefrom
DE2327015C2 (de) * 1973-05-26 1975-01-02 W. Ferd. Klingelnberg Soehne, 5630 Remscheid Elektronische Meßeinrichtung zur Beurteilung des Geräuschverhaltens von Zahnradgetrieben und zur Lokalisierung von Beschädigungen einzelner Zähne
DE2713640A1 (de) * 1977-03-28 1978-10-12 Kraftwerk Union Ag Verfahren zur ueberwachung einer anlage und anordnung zur durchfuehrung des verfahrens
JPS56137222A (en) * 1980-03-31 1981-10-27 Hitachi Ltd Axial vibration monitoring method for rotating machine
DE3907419A1 (de) * 1989-03-08 1990-09-13 Ingenieurgesellschaft Fuer Beh Verfahren zur schadensverhuetung an einer maschine oder vorrichtung
US8024084B2 (en) * 1995-06-07 2011-09-20 Automotive Technologies International, Inc. Vehicle diagnostic techniques
EP1164550B1 (fr) * 2000-06-16 2008-12-03 Ntn Corporation Système de surveillance, de diagnostic et de vente d'éléments de machine
FR2828280B1 (fr) * 2001-08-01 2004-04-16 Renault Procede et dispositif de surveillance automatique du fonctionnement d'une boite de vitesses de vehicule automobile
DE10144076A1 (de) 2001-09-07 2003-03-27 Daimler Chrysler Ag Vorrichtung und Verfahren zur Früherkennung und Vorhersage von Aggregateschädigungen
DE502006005918D1 (de) * 2005-06-25 2010-03-04 Luk Lamellen & Kupplungsbau Verfahren und vorrichtung zum überwachen der betriebssicherheit eines durch reibeingriff drehmoment übertragenden getriebes
US7606673B2 (en) * 2006-05-01 2009-10-20 Dynamic Measurement Consultants, Llc Rotating bearing analysis and monitoring system

Non-Patent Citations (1)

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Title
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Also Published As

Publication number Publication date
WO2011018289A1 (fr) 2011-02-17
CN102472684A (zh) 2012-05-23
DE102009028364A1 (de) 2011-02-17
US20120130607A1 (en) 2012-05-24
JP2013501927A (ja) 2013-01-17

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