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WO1998034090A1 - Procede et dispositif pour mesurer la profondeur de profil d'un pneu de vehicule - Google Patents

Procede et dispositif pour mesurer la profondeur de profil d'un pneu de vehicule Download PDF

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Publication number
WO1998034090A1
WO1998034090A1 PCT/EP1998/000558 EP9800558W WO9834090A1 WO 1998034090 A1 WO1998034090 A1 WO 1998034090A1 EP 9800558 W EP9800558 W EP 9800558W WO 9834090 A1 WO9834090 A1 WO 9834090A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor vehicle
tire
tread
vehicle tire
image
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.)
Ceased
Application number
PCT/EP1998/000558
Other languages
German (de)
English (en)
Inventor
Joachim Bürger
Stephan la Barré
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.)
Individual
Original Assignee
Individual
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
Priority claimed from DE1997105044 external-priority patent/DE19705044A1/de
Priority claimed from DE1997105047 external-priority patent/DE19705047A1/de
Application filed by Individual filed Critical Individual
Priority to AU62943/98A priority Critical patent/AU6294398A/en
Publication of WO1998034090A1 publication Critical patent/WO1998034090A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/22—Measuring arrangements characterised by the use of optical techniques for measuring depth

Definitions

  • the invention relates to a method for measuring the tread depth of a motor vehicle tire mounted on a motor vehicle, wherein
  • the tire tread of the motor vehicle tire is exposed to laser light
  • the light reflected from the tire tread is detected by an image-resolving sensor and
  • the signals of the image-resolving sensor are processed to generate output data in accordance with the profile depth.
  • the invention further relates to a device for measuring the tread depth of a motor vehicle tire mounted on a motor vehicle, comprising
  • a laser for generating a laser beam which can be aligned on the tread surface of the motor vehicle tire to produce a light spot
  • Measured values for the tread depth of the tire tread can be generated.
  • the profile of automotive tires is very important for safety. Via the tread, rainwater can flow off to the side under the tire, so that the tire does not float and the grip is lost (aquaplaning). This is particularly important in modern, high-speed passenger cars. In many countries, therefore, a minimum depth of the profile is required by law (in Germany 1.6 mm). Even with a tread depth of less than 3.0 mm, water displacement in the rain is reduced to only 30% of the new tire value.
  • the profile of motor vehicle tires is subject to heavy wear. This wear is difficult to see for the owner of the vehicle.
  • DE 43 16 984 AI discloses a method and a device for automatically determining the tread depth of motor vehicle tires.
  • a partially transparent measuring plate is arranged in the bottom of a measuring station.
  • a measuring head is located below the measuring plate.
  • the measuring head has a laser and an image-resolving sensor as a triangulation unit.
  • To measure the tread depth of a motor vehicle tire the measuring plate is rolled over by the tire or the tire is placed on the measuring plate.
  • the laser then creates a light spot on the tread's surface. The position of the light spot is observed by the sensor.
  • the sensor output signals are transferred to an evaluation unit, which determines the size of the tire tread.
  • the measuring head is arranged on a chute and can be moved transversely to the rolling direction of the tire.
  • the knobs of the tire tread being compressed in the radial direction of the tire in the area of the tire footprint.
  • the laser is aligned in such a way that the laser beam strikes the tire tread outside the contact area of the tire.
  • an outlet nozzle for water is arranged in the area of the measuring plate and acts on the tire profile with water before or during the measurement. Furthermore, a self-cleaning system is provided, which by cleaning the
  • DE-OS 1 809 459 describes a method and a device for automatically determining the tread depth of motor vehicle tires in flowing traffic.
  • the measuring principle is based on the so-called light section method.
  • a protective opening is provided in the street surface, below which the measuring arrangement is arranged in a pit.
  • a photoelectric contact is actuated by the tire to be measured, which triggers an electron flash.
  • a narrow band of light is generated by the electron flash.
  • the light band is sharply imaged on the tire surface through the protective opening.
  • the light band is reflected as a step line by the profile of the tire surface, the step height being proportional to the tread depth.
  • the step-like light band image is magnified on a photo layer through a telescope and a camera lens. Part of the imaging light beam is reflected by a semi-transparent mirror onto a plate, which consists of a grid of photoelectric elements.
  • An electronic evaluation device determines the step heights and thus the profile depth from the output signals of the photoelectric elements.
  • EP 0 469 948 AI also describes a device for automatically determining the tread depth of motor vehicle tires in flowing traffic.
  • a laser creates a light spot on the tire surface and the light spot is observed by an image-resolving sensor.
  • the measuring device is located under the road surface. An opening covered by a window is provided in the street surface. Several measuring units are provided one behind the other in the direction of travel.
  • WO 96/37754 discloses a method and a measuring device for measuring the tread depth of a motor vehicle tire, a laser measuring head being used which works according to the triangulation method.
  • the laser measuring head is positioned with respect to the motor vehicle tire in such a way that a reference surface assumes a defined position with respect to the tire.
  • the laser beam from the laser is guided through the reference surface at an angle to the base of the tire profile, so that a light spot is generated on the base of the tire profile.
  • the measuring device is designed as a mobile measuring device, the laser measuring head being arranged on a rod.
  • the evaluation unit, battery and printer are in a separate housing arranged.
  • the laser measuring head is manually brought up to the tires of parked motor vehicles by means of the rod.
  • the measuring device can be stationary and can be used in a brake test system or car wash. For this purpose, the measuring head is let into the road and moved over the tire profile by means of stepper motors when a tire is above the measuring head.
  • the tread grooves are therefore only recorded along a line to the rolling direction of the tire. If the vehicle tire is heavily soiled at this point or contains small stones in the tread grooves, the measurement will be falsified. It is neither possible to recognize such distorted measured values nor to average them out.
  • the invention has for its object to increase the reliability of the profile measurement of a method or a device of the type mentioned.
  • this object is achieved according to the invention by a method for
  • the motor vehicle tire is rotated during the measurement so that the measurement can be carried out at several locations on the tire tread.
  • Device for measuring the tread depth of a motor vehicle tire mounted on a motor vehicle comprising
  • Image processing means by means of which measured values for the tread depth of the tire tread can be generated from position data of the image-resolving sensor.
  • the tread surface By rotating the motor vehicle tire, the tread surface can be measured along several different lines transversely to the rolling direction of the tire, the measuring unit being able to be held stationary. It is therefore possible to measure larger areas of the profile surface and to obtain a representative value for the profile depth. Measured values which are falsified by local contamination of the profile surface or stones in the profile grooves can be averaged out because of the larger number of independent measured values or can be recognized as outliers.
  • the motor vehicle tire is advantageously rotated by at least one full revolution during the measurement. The entire tread surface of the motor vehicle tire can be recorded during the measurement. The minimum profile depth or an average profile depth can then be determined from the measured values obtained.
  • the motor vehicle tire is preferably applied to two rotatable rollers, of which at least one can be drivable. If the automobile tire is attached to the rollers during the measurement, the automobile tire can be rotated by rotating one of the rollers.
  • the motor vehicle tire can also be rotated by the motor vehicle drive.
  • the rollers can be braked when the tire is to leave the rollers.
  • the rollers can be parts of a Brernsprüfmeßvorraum.
  • a brake tester generally includes two roles by which the motor vehicle tire e.g. during the brake test is rotated at a speed of 5 km / h. Underneath the roles is usually a pit. In this case, the laser and the image-resolving sensor can be arranged in this already existing pit. The profile measurement can take place before, during or after the brake test measurement.
  • the motor vehicle tire When using rollers, the motor vehicle tire only touches the rollers. The rest of the tire tread surface is freely accessible for tread measurement, so that the tread measurement does not have to be carried out at a stressed point on the tire, even if the
  • the first optically imaging means for example a cylindrical or rod lens
  • the first optically imaging means for example a cylindrical or rod lens
  • the image of the linear laser beam on the profile surface can e.g. recorded and evaluated with a CCD camera.
  • this type of recording leads to a large amount of data, since CCD cameras generally have 512 x 512 pixels, all of which must be digitized, saved and subsequently evaluated using software.
  • CCD cameras generally have 512 x 512 pixels, all of which must be digitized, saved and subsequently evaluated using software.
  • the laser light reflected from the profile surface is anamorphically imaged onto the image-resolving sensor by second optically imaging means (for example a cylindrical or rod lens), the image-resolving sensor then being able to consist of only a single sensor line.
  • an “anamorphic image” is understood to mean an optical image in which the image scale is different in two directions perpendicular to one another. The image is contracted in relation to the dimensions of the object depicted in the direction of the largest angle of view. Such images can be Realize, for example, a cylindrical or rod lens.)
  • the two-dimensional image of the laser high line on the profile surface is thus optically essentially reduced to a one-dimensional image, which optically reduces the data.
  • the elimination of a two-dimensional detector element brings not only a reduction in costs but also the advantage that the readout process is simpler and the costs for the readout electronics can thus be reduced.
  • Another advantage is the high availability of line sensors with a large number of individual elements, which is crucial for the resolution of the overall system. Furthermore, the measuring speed can be increased.
  • FIG. 1 is a schematic representation and shows an embodiment of the device according to the invention.
  • FIG. 2 is a schematic representation and shows the course of the laser beam on the profile surface when using the light section method with linear illumination.
  • Fig. 3 illustrates the image of the reflected from the profile surface
  • FIG. 4 is a flow chart and illustrates a possible sequence of measuring the tread depth of the motor vehicle tire.
  • FIG. 5 is a flow chart and illustrates a possibility of data evaluation when measuring the tread depth of the motor vehicle tire.
  • 10 denotes a motor vehicle tire whose profile is to be measured.
  • the axis of rotation of the motor vehicle tire 10 is designated by 12.
  • the motor vehicle tire 10 bears on a first and a second roller 14 or 16 of a brake test stand 18 (not shown in detail).
  • the rollers 14 and 16 are each about an axis of rotation
  • a laser 24 and an image-resolving sensor 26 are arranged in a recess in the brake test bench 18 below the two rollers 14 and 16.
  • the laser 24 and the image-resolving sensor 26 are combined as one unit to form a laser measuring head.
  • the image-resolving sensor 26 is connected to image processing means (not shown) in the form of an electronic signal evaluation unit. Commercially available components are used as the laser, sensor and signal evaluation unit.
  • the laser 24 is arranged so that the laser beam 28 of the laser 24 forms an angle with the normal of the tread surface 30 of the motor vehicle tire 10.
  • FIG. 2 shows the course of the laser beam on the profile surface 30 when using linear illumination. Procedures which a Using lighting is called light sectioning (see, for example, company publication
  • the profile surface 30 is illuminated by a linear laser beam from the laser 24.
  • the line-shaped laser beam extends transversely to the rolling direction of the Motor vehicle tire 10 and can either cover only part of the width or the entire width of the tread surface 30. 2, the linear laser beam detects three longitudinal grooves 32, 34 and 36 of the profile surface 30.
  • the line-shaped laser beam strikes the tread surface 30 at a certain angle to the radial direction of the tire 10 (i.e. to the normal of the tread surface 30). (However, the line-shaped laser beam can also be directed perpendicularly onto the tread surface 30.) This results in a stepped laser high line on the tire surface 30, each step height corresponding to a specific tread depth.
  • Profile surface 30 have the same profile depth.
  • the stepped laser guideline shown consists of four sections 38, 40, 42 and 44 corresponding to the profile depth zero and three sections 46, 48 and 50 corresponding to the profile depth of the longitudinal grooves 32, 34 and 36.
  • the graded laser line 38, 40, 42, 44, 46, 48, 50 can be evaluated by various methods.
  • the laser high line can be recorded by a CCD camera, which is positioned at a certain angle to the laser beam.
  • the image of the sections 46, 48 and 50 will appear on the camera at different locations.
  • Evaluation of the image gives the professional information of the area covered by the laser 24. This evaluation of the recorded image is carried out via triangulation in a known manner which is not described here in detail.
  • the stepped laser vertical line 38, 40, 42, 44, 46, 48, 50 is anamorphically imaged by a cylindrical lens 52 (represented by two crossed double arrows) onto a line detector 54 (e.g. diode line).
  • a line detector 54 e.g. diode line.
  • all laser high-line sections assigned to a specific profile depth are displayed on a single diode in the diode row 54, regardless of which profile groove the laser high is reflected on.
  • the laser light line sections 38, 40, 42 and 44 are thus depicted on the diode 56 and the laser light line sections 46, 48, 50 on the diode 58 of the diode row 54. (This means that the information at which level of the profile surface a specific profile depth was measured is lost.)
  • the distance between the two diodes 56 and 58 is proportional to that
  • Profile depth of the grooves 32, 34 and 36 Each diode in the diode row thus corresponds to a specific profile depth. If several diodes of the diode row 54 are now acted upon by the laser light, the intensity ratio of the laser light can affect the individual Diodes to the total intensity on the area proportion of the corresponding profile depth to the entire profile surface.
  • the tire 10 is brought into position by the tire 10 on the two tubes 14 and 16 (FIG. 1) being brought into the position shown in FIG. 1. This is represented by block 60 in FIG. 4. Then the laser measuring head is brought into position with the tire 10
  • Block 62 This is e.g. necessary if the laser measuring head is swung away between measurements or if the height is adjusted to the size of the tire 10.
  • the measurement is started (block 64). This can be done by pressing a corresponding push button (not shown).
  • the laser 24 (FIG. 2) is switched on by actuating the pushbutton. Then the measured values of the
  • Tire tread depth detected (block 66). This is done by the highly sensitive detectors (e.g. photodiodes) in row 54 (e.g. diode array with 128 diodes) converting the intensity of the light struck by the respective diode into a voltage proportional to the respective light intensity. These voltage values are read out serially at a certain clock frequency T and converted into digital values (8 bits) by an A / D converter. These digital values are saved.
  • the measurement is ended after one or more revolutions of the tire 10 (block 68) and the measured values are evaluated. This is represented by block 70 and will be described later with reference to FIG. 5.
  • the results of the evaluation are stored (block 72) and the measurement results are output (block 74).
  • the measurement results can be output automatically or by actuating a pushbutton (not shown) which activates a printer (not shown).
  • Each element of the data array corresponds to a diode of the diode array, i.e. a position value of the tire tread.
  • the diodes located near a first end of the diode array 54 correspond to position values which are assigned to the surface of the tire tread, and the diodes located near a second end of the diode array 54 (eg diode 58 in
  • this method for determining the tire tread depth represents only one of many possibilities for evaluating the measurement data.
  • the measurement data of the data array contain more information than is used in this method. For example, not only a single value of the tire tread depth can be determined, but several values or the entire tread depth profile of the tire. It is therefore possible to also obtain information about the depth and area proportions of tread grooves, the position values of which lie between the position values of the surface of the tire and the position values of the tread profile value determined using the method described above.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

La présente invention concerne un procédé et un dispositif pour mesurer la profondeur de profil d'un pneu (10) monté sur un véhicule. Le pneu (10) est installé sur au moins un rouleau rotatif (14, 16). La surface du profil (30) est soumis à un rayon laser (28) linéaire qui génère sur ledit profil un spot de lumière. La lumière réfléchie par le profil de pneu est enregistrée par un capteur (26) à définition d'image, qui observe la position, voire la forme du spot de lumière. Les signaux du capteur (26) à définition d'image sont traités de manière à obtenir des données de sortie en fonction de la profondeur de profil. Pendant l'opération de mesure, on fait tourner le pneu (10) du véhicule afin que les mesures de profil puissent être effectuées en différents endroits du pneu.
PCT/EP1998/000558 1997-02-03 1998-02-03 Procede et dispositif pour mesurer la profondeur de profil d'un pneu de vehicule Ceased WO1998034090A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU62943/98A AU6294398A (en) 1997-02-03 1998-02-03 Method and device for measuring the pattern depth on a tyre

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE1997105044 DE19705044A1 (de) 1997-02-03 1997-02-03 Verfahren und Vorrichtung zur Datenreduzierung bei der Messung von Profilkörpern
DE19705047.6 1997-02-03
DE19705044.1 1997-02-03
DE1997105047 DE19705047A1 (de) 1997-02-03 1997-02-03 Verfahren und Vorrichtung zur Messung der Profiltiefe eines Kraftfahrzeugreifens

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WO1998034090A1 true WO1998034090A1 (fr) 1998-08-06

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WO (1) WO1998034090A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29902818U1 (de) 1999-02-17 1999-08-05 Savage, Bernd, 84550 Feichten Reifenprofil-Druckmeßgerät
DE10019386A1 (de) * 2000-04-19 2001-10-31 Bernward Maehner Verfahren und Vorrichtung zur Prüfung von Reifen
FR2861171A1 (fr) * 2003-10-15 2005-04-22 Berenisce Sas Procede et dispositif d'analyse de sculptures de pneumatique de roue de vehicule
EP1394503A3 (fr) * 2002-08-29 2006-05-17 MAHA Maschinenbau Haldenwang GmbH & Co. KG Dispositif pour mesurer la profondeur d'un profil
US7752903B2 (en) 2006-07-19 2010-07-13 Snap-On Equipment Gmbh Roller brake testing dynamometer
WO2010115390A1 (fr) * 2009-04-08 2010-10-14 Ventech Gmbh Procédé et dispositif destiné à déterminer la profondeur de sculpture d'un pneumatique de véhicule
WO2010100417A3 (fr) * 2009-03-03 2011-02-24 Sigmavision Limited Mesure d'un pneu d'un véhicule
EP2487477A1 (fr) 2011-02-10 2012-08-15 Snap-on Equipment Srl a unico socio Banc d'essai de frein
US11110755B2 (en) 2019-02-19 2021-09-07 Bridgestone Americas Tire Operations, Llc Tread wear profile tool

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0212052A2 (fr) * 1985-08-12 1987-03-04 Wilhelm Hegenscheidt Gesellschaft mbH Dispositif pour la mesure des roues d'ensembles de roues intégrées dans le véhicule
US4798964A (en) * 1985-08-12 1989-01-17 Wilhelm Hegenscheidt Gesellschaft Mbh Method and apparatus for the contactless measuring of the tread quality of railroad
US4983043A (en) * 1987-04-17 1991-01-08 Industrial Technology Institute High accuracy structured light profiler
US5182614A (en) * 1991-01-31 1993-01-26 Fmc Corporation Two-dimensional profile detection system
JPH0618233A (ja) * 1992-04-17 1994-01-25 Yokohama Rubber Co Ltd:The タイヤ検査方法
WO1996037754A1 (fr) * 1995-05-26 1996-11-28 Buerger Joachim Procede et appareil pour mesurer la profondeur de sculpture d'un pneu de vehicule automobile
US5619587A (en) * 1991-05-10 1997-04-08 Aluminum Company Of America System and method for contactlessly gauging the thickness of a contoured object, such as a vehicle wheel
EP0816799A2 (fr) * 1996-07-04 1998-01-07 Sun Electric UK Ltd. Mesure de la condition d'un pneumatique

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0212052A2 (fr) * 1985-08-12 1987-03-04 Wilhelm Hegenscheidt Gesellschaft mbH Dispositif pour la mesure des roues d'ensembles de roues intégrées dans le véhicule
US4798964A (en) * 1985-08-12 1989-01-17 Wilhelm Hegenscheidt Gesellschaft Mbh Method and apparatus for the contactless measuring of the tread quality of railroad
US4983043A (en) * 1987-04-17 1991-01-08 Industrial Technology Institute High accuracy structured light profiler
US5182614A (en) * 1991-01-31 1993-01-26 Fmc Corporation Two-dimensional profile detection system
US5619587A (en) * 1991-05-10 1997-04-08 Aluminum Company Of America System and method for contactlessly gauging the thickness of a contoured object, such as a vehicle wheel
JPH0618233A (ja) * 1992-04-17 1994-01-25 Yokohama Rubber Co Ltd:The タイヤ検査方法
WO1996037754A1 (fr) * 1995-05-26 1996-11-28 Buerger Joachim Procede et appareil pour mesurer la profondeur de sculpture d'un pneu de vehicule automobile
EP0816799A2 (fr) * 1996-07-04 1998-01-07 Sun Electric UK Ltd. Mesure de la condition d'un pneumatique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 216 (P - 1728) 18 April 1994 (1994-04-18) *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29902818U1 (de) 1999-02-17 1999-08-05 Savage, Bernd, 84550 Feichten Reifenprofil-Druckmeßgerät
DE10019386A1 (de) * 2000-04-19 2001-10-31 Bernward Maehner Verfahren und Vorrichtung zur Prüfung von Reifen
DE10019386C2 (de) * 2000-04-19 2003-04-03 Bernward Maehner Verfahren und Vorrichtung zur Prüfung von Reifen
EP1394503A3 (fr) * 2002-08-29 2006-05-17 MAHA Maschinenbau Haldenwang GmbH & Co. KG Dispositif pour mesurer la profondeur d'un profil
FR2861171A1 (fr) * 2003-10-15 2005-04-22 Berenisce Sas Procede et dispositif d'analyse de sculptures de pneumatique de roue de vehicule
US7752903B2 (en) 2006-07-19 2010-07-13 Snap-On Equipment Gmbh Roller brake testing dynamometer
US8625105B2 (en) 2009-03-03 2014-01-07 Sigmavision Limited Vehicle tyre measurement
EP3282222A1 (fr) * 2009-03-03 2018-02-14 Sigmavision Limited Fahrzeugreifenmessung
WO2010100417A3 (fr) * 2009-03-03 2011-02-24 Sigmavision Limited Mesure d'un pneu d'un véhicule
WO2010115390A1 (fr) * 2009-04-08 2010-10-14 Ventech Gmbh Procédé et dispositif destiné à déterminer la profondeur de sculpture d'un pneumatique de véhicule
US8621919B2 (en) 2009-04-08 2014-01-07 Ventech Gmbh Method and apparatus for determining the tread depth of a vehicle tire
DE102009016498A1 (de) 2009-04-08 2010-10-21 Ventech Gmbh Verfahren und Vorrichtung zum Ermitteln der Profiltiefe eines Fahrzeugreifens
EP2487477A1 (fr) 2011-02-10 2012-08-15 Snap-on Equipment Srl a unico socio Banc d'essai de frein
US8857251B2 (en) 2011-02-10 2014-10-14 Snap-On Equipment Srl A Unico Socio Brake test stand
US11110755B2 (en) 2019-02-19 2021-09-07 Bridgestone Americas Tire Operations, Llc Tread wear profile tool

Also Published As

Publication number Publication date
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