EP1415148A2 - Procede et dispositif de diagnostic de machines notamment de diagnostic de transmission - Google Patents

Procede et dispositif de diagnostic de machines notamment de diagnostic de transmission

Info

Publication number
EP1415148A2
EP1415148A2 EP01984787A EP01984787A EP1415148A2 EP 1415148 A2 EP1415148 A2 EP 1415148A2 EP 01984787 A EP01984787 A EP 01984787A EP 01984787 A EP01984787 A EP 01984787A EP 1415148 A2 EP1415148 A2 EP 1415148A2
Authority
EP
European Patent Office
Prior art keywords
magnet
hall sensor
sensor
oil
ferritic
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Withdrawn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
EP01984787A
Other languages
German (de)
English (en)
Inventor
Jörg Martin
Gabriele Schuwerk
Friedrich J. Ehrlinger
Hermann Beck
Otto Pankiewicz
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 EP1415148A2 publication Critical patent/EP1415148A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G01N15/0656—Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26—Oils; Viscous liquids; Paints; Inks
    • G01N33/28—Oils, i.e. hydrocarbon liquids
    • G01N33/2835—Specific substances contained in the oils or fuels
    • G01N33/2858—Metal particles

Definitions

  • the present invention relates to a method for machine diagnosis and in particular for transmission diagnosis for a machine or a motor vehicle according to the preamble of claim 1. Furthermore, the invention relates to a device for carrying out the method.
  • the machine oil or gear oil is used to lubricate and cool all machine elements. Since it is never changed, it is excellently suited for machine or gearbox diagnostics, as abrasion particles of all kinds are stored in the oil over time. As a result, the analysis of the machine or gear oil provides information about the condition of the machine or gear.
  • ferritic abrasion is of particular importance, since with almost every impending damage, e.g. B. Rolling bearing wear, pitting in the gearing up to tooth breakage, planet carrier pin wear etc. Ferritic wear occurs alone or in combination with other types of wear (non-ferrous metal wear, molybdenum vibrations, etc.).
  • oil diagnostic systems that detect wear metals by measuring the conductivity of the oil, see “Determining the quality and condition of lubricants", Research Institute currently 41 (2000) 3, p. 58 and "Sensors for viscosity, die - Electricity number and conductivity ", information sheet of the Fraunhofer Institute for Microelectronic Circuits and Systems, Kunststoff.
  • This measuring system is used to measure the oil quality of an internal combustion engine, making use of the fact that impurities (combustion residues, water, fuel, wear particles, etc.) change the dielectric loss factor of the oil. These changes are determined using an impedance spectroscope.
  • This sensor detects iron abrasion in the oil; however, combustion residues, water input and fuel in the oil also lead to a change, so that the lack of selectivity of this measuring system precludes use in practice.
  • the sensor signal supplied depends on both the temperature and the type of new oil.
  • the oil quality sensor which is described in the article by George S. Saloka and Allen H. Meitzler, "A Capacitive Oil Detoriation Sensor” SAE Technical Papers Series 910497, International Congress and Exposition Detroit, Michigan, February 25 - March 1, 1991, p. 137 - 145 is presented. It is a capacitive sensor that is integrated into the mounting flange of an engine oil filter, including signal processing electronics. A deterioration in the oil quality increases the permeability of the oil. The integrated sensor converts this change in permittivity into an analog shift in the oscillation frequency using an RC oscillator.
  • the present invention is therefore based on the object, starting from the prior art mentioned at the outset, of specifying a method for machine diagnosis and in particular for transmission diagnosis, which selectively detects iron abrasion and online diagnosis of the machine or Gear state enabled. Furthermore, a device for performing the method is to be specified.
  • a measuring method for machine or transmission diagnosis which is based on the Hall effect, the measuring system being installed in an oil-carrying channel or in a channel of a transmission or a machine.
  • a sensor is preferably used, the sensor housing having a lower part and an upper part, and wherein a catch magnet is arranged in the lower part, on whose surface the ferritic abrasion particles to be detected are deposited.
  • a Hall sensor is arranged in the upper part, the magnetic flux density which passes through the Hall sensor becoming smaller as the layer thickness of the ferritic abrasion particles located on the catch magnet increases, so that the output signal of the Hall sensor decreases, such that the output signal is a measure of the concentration of the ferritic abrasion particles in the machine or gear oil.
  • the invention is explained in more detail below with reference to the attached figure, which shows a schematic representation of the structure and mode of operation of an embodiment of the measuring system according to the invention.
  • a longitudinal section through a section of an oil-carrying channel of a transmission is shown.
  • the sensor housing 1 has a cylindrical shape and is inserted through a hole in the wall of the channel 2 carrying the gear oil. It preferably consists of a magnetically neutral material, for example aluminum or brass.
  • the sensor is installed in an oil-tight manner, the oil-tight assembly preferably being done by screwing in.
  • a copper disk 3 serves as a seal.
  • the sensor housing 1 has a lower part 4 and an upper part 5, which are connected to one another via three bolts 6. These bolts 6 serve as spacers and ensure that the oil flow can penetrate the sensor almost unhindered.
  • a permanent magnet 7 is arranged in the lower part 4 of the sensor housing and is glued into the lower part 4.
  • the permanent magnet 7 serves as a catch magnet and is simply polarized perpendicular to its central plane.
  • the ferritic abrasion particles 8 to be detected accumulate on the magnetic surface and are thus removed from the oil circuit.
  • In the upper part 5 of the housing 1 there is a blind hole with a fine thread.
  • a threaded pin 9 made of brass is screwed into this thread.
  • a Hall sensor 10 is arranged on the face of the threaded pin 9.
  • the threaded pin 9 has a continuous milled groove 11 in which the freely electrical contacts 12 of the Hall sensor 10 are laid.
  • a two-component adhesive 13 is used according to the invention for mounting the Hall sensor 10 on the threaded pin 9 and for pouring out the groove 11 serving as a cable duct. Furthermore, two plane-parallel surfaces 14 for receiving an open-ended wrench are milled at the end of the grub screw 9. According to the invention, the setscrew 9 is secured against inadvertent rotation by means of a lock nut 15. To seal the threaded pin in the lower housing part 4, a commercially available liquid screw locking agent that hardens after a short time is used. The grub screw 9 and the catch magnet 7 have a lateral offset to one another, which is decisive for the effectiveness and sensitivity of the sensor.
  • the construction according to the invention ensures that the distance h_0 of the Hall cell 10 from the surface of the catch magnet 7 is infinitely adjustable. In this way, an adaptation of the abrasion sensor to the magnetic field strength of the catching magnet 7 and to the prevailing flow conditions is made possible.
  • a temperature sensor can be integrated in the lower housing part 4 or arranged in the tube wall in the immediate vicinity of the abrasion sensor.
  • the measuring method according to the invention works as follows: The interior of the abrasion sensor is flushed by part of the oil flow (indicated by the arrow in the figure). There are ferritic abrasion particles in the oil flow, which attach to the catch magnet if the magnetic force acting on them is large enough to separate them from the oil. As the operating time of the sensor according to the invention increases, more and more iron abrasion particles accumulate on the capture magnet, so that a particle layer with a continuously increasing thickness h forms. Accord- Accordingly, the initially constant distance h_0 between the magnetic surface and the surface of the Hall sensor 10 decreases.
  • the output signal of the Hall sensor 10 thus decreases with increasing layer thickness of the ferritic abrasion particles located on the capture magnet.
  • the output signal of the Hall sensor 10 is measured and serves as a measure of the concentration of the ferritic wear particles in the oil to be examined. Because of its size, this output signal can be processed in a gearbox control unit without additional shielding measures, and a possible temperature compensation of the sensor signal can likewise only take place in the gearbox control unit.
  • an electromagnet is used instead of the permanent magnet 7. This makes it possible to adapt the magnetic field strength to the sensor at a constant distance h_0 of the Hall cell 10 from the surface of the electromagnet and to adapt it to the prevailing flow conditions.
  • This embodiment has the advantage that no set screw is required and that the adjustment is not mechanical, but electrical.
  • the invention presented here also has the following advantages:
  • the assembly of the abrasion sensor in the oil-carrying channel is very simple, the supply voltage of 5 volts DC required for the Hall sensor being provided by every electronic transmission control unit as standard.
  • the measuring system according to the invention is inexpensive to manufacture and extremely compact, so that little installation space is required. Another advantage is that the measuring method is independent of the geometry of the channel cross-section.
  • the sensor signal has a linear dependence on the thickness of the particle layer on the catch magnet. This means that the particle capture efficiency can be adjusted by an appropriate choice of the magnetic field strength or the energy density of the capture magnet, as a result of which the abrasion sensor can be adapted to the prevailing flow conditions in the oil-carrying channel.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Pathology (AREA)
  • Immunology (AREA)
  • General Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Medicinal Chemistry (AREA)
  • Food Science & Technology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • General Details Of Gearings (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)

Abstract

L'invention concerne un procédé permettant d'effectuer un diagnostic de machines, notamment un diagnostic de transmission par analyse de l'huile de transmission ou de carter et notamment de détecter une usure ferritique (8). Ce procédé est caractérisé en ce que l'on utilise un capteur à effet Hall (10) dont la tension de sortie donne une indication de la concentration des particules d'usure ferritiques (8) dans l'huile de transmission ou de carter.
EP01984787A 2000-12-05 2001-11-29 Procede et dispositif de diagnostic de machines notamment de diagnostic de transmission Withdrawn EP1415148A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2000160609 DE10060609A1 (de) 2000-12-05 2000-12-05 Verfahren und Einrichtung zur Maschinendiagnose und insbesondere zur Getriebediagnose
DE10060609 2000-12-05
PCT/EP2001/013974 WO2002046744A2 (fr) 2000-12-05 2001-11-29 Procede et dispositif de diagnostic de machines notamment de diagnostic de transmission

Publications (1)

Publication Number Publication Date
EP1415148A2 true EP1415148A2 (fr) 2004-05-06

Family

ID=7665996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01984787A Withdrawn EP1415148A2 (fr) 2000-12-05 2001-11-29 Procede et dispositif de diagnostic de machines notamment de diagnostic de transmission

Country Status (3)

Country Link
EP (1) EP1415148A2 (fr)
DE (1) DE10060609A1 (fr)
WO (1) WO2002046744A2 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10230757A1 (de) 2002-07-09 2004-01-22 Zf Friedrichshafen Ag Verfahren und Einrichtung zur Maschinendiagnose und insbesondere zur Getriebediagnose
DE10258333B4 (de) * 2002-12-12 2013-07-18 Hilti Aktiengesellschaft Metallpartikelsensor
EP1508880A3 (fr) * 2003-08-06 2005-11-23 Battenfeld Extrusionstechnik GmbH Procedée et appareil pour le calcul de la durée de vie previsible d'un engrenage
DE10353647B4 (de) * 2003-08-06 2006-01-12 Battenfeld Extrusionstechnik Gmbh Verfahren zum Berechnen der voraussichtlichen Lebensdauer eines Getriebes
DE102009024561A1 (de) * 2009-06-08 2010-12-16 Hydac Filter Systems Gmbh Verfahren und Vorrichtung zum Erfassen von Verunreinigungen in einem Fluid
DE102011086216A1 (de) 2011-11-11 2013-05-16 Endress + Hauser Gmbh + Co. Kg Feldgerät
US20150338318A1 (en) * 2013-01-16 2015-11-26 Gastops Ltd. Assembly for monitoring contaminant particles in liquid flow
DE102014202354A1 (de) 2014-02-10 2015-08-13 Zf Friedrichshafen Ag Dichtvorrichtung für ein Sensorgehäuse
US12065623B2 (en) 2019-04-26 2024-08-20 Vgp Ipco Llc Lubricant for use in electric and hybrid vehicles and methods of using the same
AU2020261438B2 (en) * 2019-04-26 2022-12-22 Vgp Ipco Llc Lubricant for use in electric and hybrid vehicles and methods of using the same
CN114215779A (zh) * 2021-11-29 2022-03-22 东风柳州汽车有限公司 一种工业风扇的故障预知诊断方法和装置

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GB2137536A (en) * 1983-02-10 1984-10-10 Tecalemit Electronics Ltd Magnetic particle collector
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IT1208858B (it) * 1987-03-06 1989-07-10 Iveco Fiat Particelle di usura nel fluido lu sensore per rilevare il livello di brificante di sistemi di propulsio particelle ferromagnetiche presenti ne di autoveicoli in un fluido particolarmente per rilevare il livello di presenza di
SU1631256A1 (ru) * 1988-02-10 1991-02-28 Предприятие П/Я Р-6495 Щуп касани
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US5179346A (en) * 1991-05-24 1993-01-12 Caterpillar, Inc. Conductive particle sensor using a magnet
US5502378A (en) * 1993-07-26 1996-03-26 Caterpillar Fluid particle sensor including a container, a first coil and a second coil disposed about a magnet located adjacent the container for attracting the particles
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JPH09288029A (ja) * 1996-04-23 1997-11-04 Saginomiya Seisakusho Inc ホール素子を用いた微差圧センサーの調整方法及び装置
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Also Published As

Publication number Publication date
WO2002046744A3 (fr) 2004-02-19
WO2002046744A2 (fr) 2002-06-13
DE10060609A1 (de) 2002-09-19

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