EP1969309A1 - Method for optically measuring a chassis - Google Patents

Method for optically measuring a chassis

Info

Publication number
EP1969309A1
EP1969309A1 EP06819529A EP06819529A EP1969309A1 EP 1969309 A1 EP1969309 A1 EP 1969309A1 EP 06819529 A EP06819529 A EP 06819529A EP 06819529 A EP06819529 A EP 06819529A EP 1969309 A1 EP1969309 A1 EP 1969309A1
Authority
EP
European Patent Office
Prior art keywords
wheel
determined
detected
radiation
points
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Withdrawn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
EP06819529A
Other languages
German (de)
French (fr)
Inventor
Volker Uffenkamp
Guenter Nobis
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1969309A1 publication Critical patent/EP1969309A1/en
Withdrawn legal-status Critical Current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
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
    • G01B11/2513—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object with several lines being projected in more than one direction, e.g. grids, patterns
    • 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
    • G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
    • G01B11/275—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing wheel alignment
    • G01B11/2755—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing wheel alignment using photoelectric detection means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B2210/00—Aspects not specifically covered by any group under G01B, e.g. of wheel alignment, caliper-like sensors
    • G01B2210/10—Wheel alignment
    • G01B2210/20—Vehicle in a state of translatory motion
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B2210/00—Aspects not specifically covered by any group under G01B, e.g. of wheel alignment, caliper-like sensors
    • G01B2210/10—Wheel alignment
    • G01B2210/28—Beam projector and related sensors, camera, inclinometer or other active sensing or projecting device
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B2210/00—Aspects not specifically covered by any group under G01B, e.g. of wheel alignment, caliper-like sensors
    • G01B2210/10—Wheel alignment
    • G01B2210/28—Beam projector and related sensors, camera, inclinometer or other active sensing or projecting device
    • G01B2210/283—Beam projectors and related sensors
    • G01B2210/286—Projecting a light pattern on the wheel or vehicle body

Definitions

  • the invention relates to a method for the optical chassis measurement at a test station, in which detected by a plurality of optically distinguishable characteristic structures on a vehicle at least one wheel and a surrounding body panel reflected radiation from a measuring device by means of an image pickup device and by evaluation of the detected Radiation obtained position data at least the wheel plane and the wheel center are determined.
  • Such a method for optical chassis measurement is disclosed in DE 197 57 763 A1 and similarly also in EP 1 042 643 B1.
  • these known methods by means of cameras reference features at the test station and continue to record wheel characteristics and body features and on the basis of this information the driving axle and also determined wheel and Achsgeometriechal, according to DE 197 57 763 Al, the measurement in the state and in the process according to EP 1 042 643 Bl, the measurement takes place while driving past the measuring device.
  • the characteristics of room light is used in the test area, the characteristics of the wheel and the body in particular mounted marks or existing characteristic structures can be.
  • a special lighting for example by means of LEDs, with special retroreflective measuring marks on the wheel or the body can be mounted. Further details on the type and detection of the wheel and axle geometry data are made from the geometric information obtained by means of the marks and / or surface structures in these documents and other patent applications based thereon. In practice, it has become clear that obtaining accurate and reliable measurement The application of well-recognizable brands is favorable, but their adaptation to the wheel and body requires a considerable effort, although compared to other systems for chassis measurement with these known systems, the measurement could be greatly facilitated overall.
  • the object of the invention is to provide a method for the optical chassis measurement, with which the most accurate and reliable measurement results are obtained with the least possible effort.
  • an attachment and adaptation of measuring marks on the vehicle wheel or the body while using the measuring device with said measures from existing surface structures, the surface points used for the measurement reliably and clearly obtained and subjected to the evaluation, so that accurate measurement results are obtained, in particular
  • the accuracy can be increased by increasing the number of surface profiles, whereby an appropriate lower individual accuracy can be compensated by averaging using appropriate algorithms.
  • the omission of an adaptation of marks on the wheel and body considerably simplifies the operation of the wheel alignment system, inter alia because no restriction with regard to materials rial of the body, no removal of hubcaps and no additional labor for adaptation to the measurement are connected.
  • the evaluation is facilitated by selectively recording individual profiles or the entire surface structure of the object sections of interest of at least the wheel and the body section via the projection of the planes, and also by using a light-section method, a Gray code method with coded light projection or a phase shift method is used.
  • the measurement is advantageously carried out in such a way that for determining the wheel plane, the wheel center and possibly the body cutout around the wheel a plurality of surface points as SD point cloud, but at least three intersections between two surface profiles and rotationally symmetrical contours of the wheel, for example, the rim edge, be used.
  • An advantageous procedure in the measurement is that the measurement is carried out while driving past the vehicle and driving direction data is obtained on the basis of a detection of the direction of movement of body surface structures.
  • FIG. 1 is a schematic fragmentary view of a test station in the direction of travel with a measuring device and a part of a vehicle to be measured and - A -
  • Fig. 2 shows a detail of the test station of FIG. 1 in a side view.
  • the measuring instrument comprises an image recording device 11 equipped with image sensor 11.1 and imaging optics 11.2, in particular a camera arrangement with at least one camera in which processors for the image processing is integrated, and at least one measurement plane 12, which is generated by a projector 13. Furthermore, powerful computers are connected to the measuring instrument in accordance with the measuring effort. By means of the measuring device 10, various data, in particular a wheel suspension 9 can be determined.
  • one or more planes 12, 12 ' are projected by a radiation source 13. 1, in particular a laser, into the measurement space by means of a slit diaphragm in front of or in a projection optical unit 13. 2, which intersect the object surface and the profile lines 14, 14 'on the measurement object, ie the wheel and possibly the surrounding body generate.
  • the projected planes 12, 12 ' may also be generated by another type of projection device (e.g., beamer). Due to the geometrical arrangement of projection device 13 and camera 11, the camera records the intersection of plane 12, 12 'with the object as a profile line 14, 14', which is more or less curved as a function of the surface topography.
  • the principle of triangulation technique is applied.
  • Each profile point has a two-dimensional image coordinate. If the association between camera and projection device is known, the spatial position of the surface point is determined by the intersection of the image beam with the plane.
  • the spatial position of the surface point is determined by the intersection of the image beam with the plane.
  • Various methods are known, namely in particular light-section method, gray-code method (coded light approach) and phase shift method.
  • the acquisition of the profile lines can advantageously be done by obtaining a 3D point cloud.
  • Each vehicle wheel has on the basis of its components such as tires, rim, hubcap, valve or the like.
  • On a 3D surface structure that can be used to measure the wheel and axle geometry and each wheel house contour has, in particular in the area of the Radausschnitts characteristic features of which Loading state for each wheel can be derived.
  • the determination of at least two surface profiles from the surface structure allows the determination of the wheel geometry, if the two profiles cut, for example, the wheel rim, at least three times. With a small number of surface profiles, it is advantageous if the cuts are as perpendicular as possible to the edge of the rim. From the at least three rim edge points, the wheel plane and the wheel center can be calculated out. With this information track and camber and, if desired, further wheel and axle geometry data of interest can be obtained.
  • the determination of the movement of the body relative to the measuring device is required.
  • the direction of travel or the driving axis of the moving vehicle is determined from the path of movement of distinctive body structures.
  • the size of the object section can be adapted to different vehicle types and rim sizes according to the localization of the object structures of interest.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The invention relates to a method for optically measuring a chassis at a testing station. According to said method, radiation that is reflected by several optically distinguishable characteristic structures on a vehicle, comprising at least one wheel and a surrounding bodywork section, is detected by a measuring device with the aid of an image capture unit and at least the wheel plane and the wheel centre point are determined by an evaluation of the positional data obtained by means of the detected radiation. To obtain reliable measurement results relatively simply, several planes are projected at least onto the wheel (5) and the surrounding bodywork using structured light that is emitted by at least one radiation source of the measuring device, and the intersection of the planes with the wheel (5) and the surrounding bodywork or with a sub-section of the wheel and bodywork is captured as profile lines (3D point cloud) by means of at least one image capture unit, on the basis of a known geometrical assignment of the radiation source or sources to the image capture unit or units. From the intersection points of the profile lines with e.g. the edge of the rim or other rotationally symmetrical contours on the wheel and the wheel opening, the spatial position of characteristic surface points is determined, said points being used to directly determine the relevant chassis data.

Description

Verfahren zur optischen FahrwerksvermessungMethod for optical chassis measurement
Die Erfindung bezieht sich auf ein Verfahren zur optischen Fahrwerksvermessung an einem Prüfplatz, bei dem von mehreren optisch unterscheidbaren charakteristischen Strukturen an einem Fahrzeug zu- mindest eines Rades und eines umgebenden Karosserieausschnittes reflektierte Strahlung von einer Messvorrichtung mittels einer Bildaufnahmeeinrichtung erfasst und durch Auswertung von durch die erfasste Strahlung gewonnenen Positionsdaten zumindest die Radebene und der Radmittelpunkt ermittelt werden.The invention relates to a method for the optical chassis measurement at a test station, in which detected by a plurality of optically distinguishable characteristic structures on a vehicle at least one wheel and a surrounding body panel reflected radiation from a measuring device by means of an image pickup device and by evaluation of the detected Radiation obtained position data at least the wheel plane and the wheel center are determined.
Stand der TechnikState of the art
Ein derartiges Verfahren zur optischen Fahrwerksvermessung ist in der DE 197 57 763 Al und ähnlich auch in der EP 1 042 643 B 1 angegeben. Bei diesen bekannten Verfahren werden mit Hilfe von Kameras Bezugsmerkmale am Prüfplatz und weiterhin Radmerkmale und Karosseriemerkmale erfasst und auf der Basis dieser Informationen die Fahrachse und weiterhin Rad- und Achsgeometriedaten ermittelt, wobei nach der DE 197 57 763 Al die Messung im Stand und bei dem Verfahren nach der EP 1 042 643 Bl die Messung während der Vorbeifahrt an der Messvorrichtung erfolgt. Zum Erfassen der Merkmale wird Raumlicht im Prüfplatzbereich genutzt, wobei die Merkmale insbesondere des Rades und der Karosserie angebrachte Marken oder vorhandene charakteristische Strukturen sein können. Es kann aber auch an der Messvorrichtung eine spezielle Beleuchtung beispielsweise mittels Leuchtdioden vorgesehen sein, wobei auch spezielle retroreflektierende Messmarken am Rad bzw. der Karosserie angebracht sein können. Auch sind nähere Angaben zu der Art und Erfassung der Rad- und Achsgeometriedaten aus den mittels der Marken und/oder Oberflächenstrukturen gewonnenen geometrischen Informationen in diesen Druckschriften und darauf basierenden weiteren Patentanmeldungen gemacht. In der Praxis hat sich gezeigt, dass für die Gewinnung genauer und zuverlässiger Mess- ergebnisse die Anbringung gut erfassbarer Marken günstig ist, deren Adaption an Rad und Karosserie jedoch einen nicht unerheblichen Aufwand verlangt, obwohl gegenüber anderen Systemen zur Fahr- werksvermessung mit diesen bekannten Systemen die Messung insgesamt erheblich erleichtert werden konnte.Such a method for optical chassis measurement is disclosed in DE 197 57 763 A1 and similarly also in EP 1 042 643 B1. In these known methods by means of cameras reference features at the test station and continue to record wheel characteristics and body features and on the basis of this information the driving axle and also determined wheel and Achsgeometriedaten, according to DE 197 57 763 Al, the measurement in the state and in the process according to EP 1 042 643 Bl, the measurement takes place while driving past the measuring device. For detecting the characteristics of room light is used in the test area, the characteristics of the wheel and the body in particular mounted marks or existing characteristic structures can be. But it can also be provided on the measuring device, a special lighting, for example by means of LEDs, with special retroreflective measuring marks on the wheel or the body can be mounted. Further details on the type and detection of the wheel and axle geometry data are made from the geometric information obtained by means of the marks and / or surface structures in these documents and other patent applications based thereon. In practice, it has become clear that obtaining accurate and reliable measurement The application of well-recognizable brands is favorable, but their adaptation to the wheel and body requires a considerable effort, although compared to other systems for chassis measurement with these known systems, the measurement could be greatly facilitated overall.
Vorteile der ErfindungAdvantages of the invention
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur optischen Fahrwerksvermessung bereit zu stellen, mit dem möglichst genaue und zuverlässige Messergebnisse bei möglichst geringem Auf- wand erhalten werden.The object of the invention is to provide a method for the optical chassis measurement, with which the most accurate and reliable measurement results are obtained with the least possible effort.
Diese Aufgabe wird mit den Merkmalen des Anspruches 1 gelöst. Hierbei ist vorgesehen, dass zumindest auf das Rad und die umgebende Karosserie mit von mindestens einer Strahlungsquelle der Messvorrichtung abgegebenem strukturiertem Licht z.B. mit einer Schlitzblende vor oder in einer Projekti- onsoptik mehrere Ebenen projiziert werden und der Schnitt der Ebenen mit dem Rad und der umgebenden Karosserie oder einem Teilbereich daraus mittels mindestens einer Bildaufnahmeeinrichtung auf der Grundlage der geometrisch bekannten Zuordnung von der mindestens einen Strahlungsquelle und der mindestens einen Bildaufnahmeeinrichtung als Profillinien aufgenommen werden, wobei die Aufnahme über die Gewinnung einer 3D Punktwolke erfolgt, und dass ggf. aus Schnittpunkten der Profillinien und z.B. dem Felgenrand oder anderen rotationssymmetrischen Konturen am Rad sowie dem Radausschnitt als Positionsdaten die räumliche Lage charakteristischer Oberflächenpunkte bestimmt werden, aus denen unmittelbar die interessierenden Fahrwerksdaten bestimmt werden.This object is achieved with the features of claim 1. It is provided here that at least on the wheel and the surrounding body with structured light emitted by at least one radiation source of the measuring device, e.g. with a slit diaphragm in front of or in a projection optics several levels are projected and the intersection of the planes with the wheel and the surrounding body or a sub-area thereof by means of at least one image pickup device on the basis of the geometrically known assignment of the at least one radiation source and the at least one Image recording device are recorded as profile lines, the recording is done on the extraction of a 3D point cloud, and that, if necessary, from intersections of the profile lines and eg the rim edge or other rotationally symmetrical contours on the wheel and the wheel cut as position data, the spatial position of characteristic surface points are determined, from which the relevant chassis data are determined directly.
Hierbei entfällt eine Anbringung und Adaption von Messmarken am Fahrzeugrad bzw. der Karosserie, während mittels der Messvorrichtung mit den genannten Maßnahmen aus vorhandenen Oberflächenstrukturen die für die Messung herangezogenen Oberflächenpunkte zuverlässig und eindeutig gewonnen und der Auswertung unterzogen werden, so dass genaue Messergebnisse erhalten werden, insbesondere wenn leistungsfähige Prozessoren und Rechner in Verbindung mit Bildaufnahmeeinrichtung- en, beispielsweise Kameras, für die Bilderfassung und Auswertung verwendet werden. Die Genauig- keit kann erhöht werden, indem die Anzahl der Oberflächenprofile erhöht wird, wobei durch Anwendung entsprechender Algorithmen eine gegebenenfalls geringere Einzelgenauigkeit durch Mittelung kompensiert werden kann. Der Verzicht auf eine Adaption von Marken an Rad und Karosserie vereinfacht die Bedienung des Achsmesssystems wesentlich, u.a. weil keine Einschränkung bezüglich Mate- rial der Karosserie, kein Entfernen von Radkappen und kein zusätzlicher Arbeitsaufwand zur Adaption mit der Messung verbunden sind.In this case, an attachment and adaptation of measuring marks on the vehicle wheel or the body, while using the measuring device with said measures from existing surface structures, the surface points used for the measurement reliably and clearly obtained and subjected to the evaluation, so that accurate measurement results are obtained, in particular When powerful processors and computers are used in conjunction with Bildaufnahmeeinrichtung- en, such as cameras for image acquisition and evaluation. The accuracy can be increased by increasing the number of surface profiles, whereby an appropriate lower individual accuracy can be compensated by averaging using appropriate algorithms. The omission of an adaptation of marks on the wheel and body considerably simplifies the operation of the wheel alignment system, inter alia because no restriction with regard to materials rial of the body, no removal of hubcaps and no additional labor for adaptation to the measurement are connected.
Die Auswertung wird dabei dadurch begünstigt, dass über die Projektion der Ebenen gezielt Einzel- profile oder die gesamte Oberflächenstruktur der interessierenden Objektausschnitte zumindest des Rades und des Karosserieausschnitts aufgenommen werden, und ferner dadurch, dass ein Lichtschnittverfahren, ein Gray-Code- Verfahren mit codiertem Lichtansatz oder ein Phasenshift- Verfahren angewandt wird.The evaluation is facilitated by selectively recording individual profiles or the entire surface structure of the object sections of interest of at least the wheel and the body section via the projection of the planes, and also by using a light-section method, a Gray code method with coded light projection or a phase shift method is used.
Die Messung erfolgt vorteilhaft in der Weise, dass zum Bestimmen der Radebene, des Radmittelpunktes und ggf. des Karosserieausschnitts um das Rad eine Vielzahl von Oberflächenpunkten als SD- Punktwolke, mindestens jedoch drei Schnittpunkte zwischen zwei Oberflächenprofilen und rotationssymmetrischen Konturen des Rades, beispielsweise des Felgenrandes, herangezogen werden.The measurement is advantageously carried out in such a way that for determining the wheel plane, the wheel center and possibly the body cutout around the wheel a plurality of surface points as SD point cloud, but at least three intersections between two surface profiles and rotationally symmetrical contours of the wheel, for example, the rim edge, be used.
Ein wichtiger Anwendungsfall besteht darin, dass aus der Kante des Radausschnitts der Beladungszustand des Rades und aus der Radebene und dem Radmittelpunkt Spur und Sturz bestimmt werden.An important application is that from the edge of Radausschnitts the loading condition of the wheel and from the wheel plane and the wheel center track and camber are determined.
Weitere Vorteile für die Messung ergeben sich dadurch, dass bei der Abtastung signifikante Oberflächenmerkmale am Rad wie Ventil, Lochbild, Beschriftung, Schmutz und/oder eine Beschädigung detektiert werden und dass auf der Grundlage dieser Oberflächenmerkmale bei rotierendem Rad (z.B. beim Abrollen auf der Fahrbahn) ein Felgenschlag erfasst und bei der weiteren Auswertung berücksichtigt wird.Further advantages for the measurement result from the fact that significant surface features on the wheel such as valve, hole pattern, inscription, dirt and / or damage are detected during scanning and that on the basis of these surface characteristics with rotating wheel (eg when rolling on the road) a rim strike is detected and taken into account in the further evaluation.
Eine vorteilhafte Vorgehensweise bei der Messung besteht darin, dass die Messung während einer Vorbeifahrt des Fahrzeugs durchgeführt wird und Fahrtrichtungsdaten aufgrund einer Erfassung der Bewegungsrichtung von Karosserie-Oberflächenstrukturen gewonnen werden.An advantageous procedure in the measurement is that the measurement is carried out while driving past the vehicle and driving direction data is obtained on the basis of a detection of the direction of movement of body surface structures.
Zeichnungendrawings
Die Erfindung wird nachfolgend anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeich- nungen näher erläutert. Es zeigen:The invention will be explained in more detail by means of exemplary embodiments with reference to the drawings. Show it:
Fig. 1 eine schematische ausschnittsweise Ansicht eines Prüfplatzes in Fahrtrichtung mit einer Messvorrichtung und einem Teil eines zu vermessenden Fahrzeugs und - A -1 is a schematic fragmentary view of a test station in the direction of travel with a measuring device and a part of a vehicle to be measured and - A -
Fig. 2 einen Ausschnitt des Prüfplatzes nach Fig. 1 in einer seitlichen Ansicht.Fig. 2 shows a detail of the test station of FIG. 1 in a side view.
Offenbarung der Erfindung Die Fig. 1 zeigt ein seitlich eines Fahrzeuges im Bereich eines Rades 5 aufgestelltes Messinstrument einer Messvorrichtung 10. Das Messinstrument umfasst eine mit Bildsensor 11.1 und Abbildungsoptik 11.2 ausgerüstete Bildaufnahmeeinrichtung 11 , insbesondere eine Kameraanordnung mit mindestens einer Kamera, in der vorteilhaft Prozessoren für die Bildverarbeitung integriert sind, und mindestens eine Messebene 12, die von einem Projektor 13 erzeugt wird. An das Messinstrument sind des Weite- ren dem Messaufwand entsprechend leistungsfähige Rechner angeschlossen. Mittels der Messvorrichtung 10 lassen sich verschiedene Daten insbesondere einer Radaufhängung 9 bestimmen.1 shows a measuring instrument 10 placed laterally of a vehicle in the region of a wheel 5. The measuring instrument comprises an image recording device 11 equipped with image sensor 11.1 and imaging optics 11.2, in particular a camera arrangement with at least one camera in which processors for the image processing is integrated, and at least one measurement plane 12, which is generated by a projector 13. Furthermore, powerful computers are connected to the measuring instrument in accordance with the measuring effort. By means of the measuring device 10, various data, in particular a wheel suspension 9 can be determined.
Wie Fig. 2 zeigt, werden von einer Strahlungsquelle 13.1, insbesondere einem Laser, mittels einer Schlitzblende vor oder in einer Projektionsoptik 13.2 eine bzw. mehrere Ebenen 12, 12' in den Mess- räum projiziert, die die Objektoberfläche schneiden und die Profillinien 14, 14' auf dem Messobjekt, also dem Rad und gegebenenfalls der dieses umgebenden Karosserie erzeugen. Die projizierten Ebenen 12, 12' können auch durch eine andere Art einer Projektionseinrichtung (z.B. Beamer) erzeugt werden. Durch die geometrische Anordnung von Projektionsvorrichtung 13 und Kamera 11 nimmt die Kamera den Schnitt der Ebene 12, 12' mit dem Objekt als eine Profϊllinie 14, 14' auf, die in Abhän- gigkeit der Oberflächentopographie mehr oder weniger gekrümmt ist. Zur dreidimensionalen Bestimmung der Höhenprofile aus digitalen Bildern wird das Prinzip der Triangulationstechnik angewandt. Zu jedem Profilpunkt gibt es eine zweidimensionale Bildkoordinate. Ist die Zuordnung zwischen Kamera und Projektionseinrichtung bekannt, wird durch den Schnittpunkt des Bildstrahls mit der Ebene die räumliche Lage des Oberflächenpunktes bestimmt. Durch entsprechende Strukturierung des Lichts können entweder gezielt Einzelprofile aufgenommen werden oder die gesamte Oberflächenstruktur des Objektes, d.h. des Rades und gegebenenfalls der betreffenden Karosserieabschnitte. Verschiedene Verfahren sind bekannt, nämlich insbesondere Lichtschnittverfahren, Gray-Code- Verfahren (codierter Lichtansatz) und Phasenshift- Verfahren. Die Erfassung der Profillinien kann vorteilhaft über die Gewinnung einer 3D-Punktwolke erfolgen.As shown in FIG. 2, one or more planes 12, 12 'are projected by a radiation source 13. 1, in particular a laser, into the measurement space by means of a slit diaphragm in front of or in a projection optical unit 13. 2, which intersect the object surface and the profile lines 14, 14 'on the measurement object, ie the wheel and possibly the surrounding body generate. The projected planes 12, 12 'may also be generated by another type of projection device (e.g., beamer). Due to the geometrical arrangement of projection device 13 and camera 11, the camera records the intersection of plane 12, 12 'with the object as a profile line 14, 14', which is more or less curved as a function of the surface topography. For the three-dimensional determination of height profiles from digital images, the principle of triangulation technique is applied. Each profile point has a two-dimensional image coordinate. If the association between camera and projection device is known, the spatial position of the surface point is determined by the intersection of the image beam with the plane. By appropriate structuring of the light, either individual profiles can be taken up in a targeted manner or the entire surface structure of the object, i. the wheel and, where appropriate, the body sections concerned. Various methods are known, namely in particular light-section method, gray-code method (coded light approach) and phase shift method. The acquisition of the profile lines can advantageously be done by obtaining a 3D point cloud.
Jedes Fahrzeugrad weist anhand seiner Bauteile wie Reifen, Felge, Radkappe, Ventil oder dgl. eine 3D-Oberflächenstruktur auf, die zur Messung der Rad- und Achsgeometrie herangezogen werden kann und jede Radhauskontur weist insbesondere im Bereich des Radausschnitts charakteristische Merkmale auf, aus denen der Beladungszustand für das jeweilige Rad abgeleitet werden kann. Die Erfassung von mindestens zwei Oberflächenprofilen aus der Oberflächenstruktur erlaubt die Bestimmung der Radgeometrie, wenn die beiden Profile z.B. die Radfelge, mindestens dreimal schneiden. Bei einer geringen Anzahl von Oberflächenprofilen ist es vorteilhaft, wenn die Schnitte möglichst senkrecht zum Felgenrand verlaufen. Aus den mindestens drei Felgenrandpunkten lassen sich die Radebene sowie der Radmittelpunkt herausrechnen. Mit diesen Informationen können Spur und Sturz und gewünschtenfalls weitere interessierende Rad- und Achsgeometriedaten gewonnen werden.Each vehicle wheel has on the basis of its components such as tires, rim, hubcap, valve or the like. On a 3D surface structure that can be used to measure the wheel and axle geometry and each wheel house contour has, in particular in the area of the Radausschnitts characteristic features of which Loading state for each wheel can be derived. The determination of at least two surface profiles from the surface structure allows the determination of the wheel geometry, if the two profiles cut, for example, the wheel rim, at least three times. With a small number of surface profiles, it is advantageous if the cuts are as perpendicular as possible to the edge of the rim. From the at least three rim edge points, the wheel plane and the wheel center can be calculated out. With this information track and camber and, if desired, further wheel and axle geometry data of interest can be obtained.
Signifikante Oberflächenmerkmale am Rad wie Ventil, Lochbild, Beschriftung oder auch weitere Merkmale, wie Schmutz und Beschädigung, lassen sich detektieren. Daraus lässt sich ein möglicher Felgenschlag bei rotierendem Rad (z.B. beim Abrollen auf der Fahrbahn) ermitteln und bei der Auswertung berücksichtigen.Significant surface features on the wheel such as valve, hole pattern, labeling or other features such as dirt and damage can be detected. From this it is possible to determine a possible wheel flapping with a rotating wheel (for example when rolling on the road) and to take it into account in the evaluation.
Erfolgt eine Messung in der Vorbeifahrt, ist die Bestimmung der Bewegung der Karosserie relativ zur Messvorrichtung erforderlich. Aus der Bewegungsbahn markanter Karosseriestrukturen wird die Fahr- richtung bzw. die Fahrachse des bewegten Fahrzeuges ermittelt.If a measurement is made in passing, the determination of the movement of the body relative to the measuring device is required. The direction of travel or the driving axis of the moving vehicle is determined from the path of movement of distinctive body structures.
In der Regel wird zu Beginn einer Messung ein größerer Objektausschnitt mit einem Teil der Karosserie und dem Rad erfasst. Zur Verringerung des erforderlichen Messaufwandes kann die Größe des Objektausschnitts nach Lokalisierung der interessierenden Objektstrukturen an verschiedene Fahr- zeugtypen und Felgengrößen angepasst werden. As a rule, at the beginning of a measurement, a larger object section is detected with a part of the body and the wheel. In order to reduce the required measurement effort, the size of the object section can be adapted to different vehicle types and rim sizes according to the localization of the object structures of interest.

Claims

A n s p r ü c h e Claims
1. Verfahren zur optischen Fahrwerksvermessung an einem Prüfplatz, bei dem von mehreren optisch unterscheidbaren charakteristischen Strukturen an einem Fahrzeug zumindest eines Rades und eines umgebenden Karosserieausschnitts reflektierte Strahlung von einer Messvorrichtung mittels einer Bildaufnahmeeinrichtung erfasst und durch Auswertung von durch die erfasste Strahlung gewonnenen Positionsdaten zumindest die Radebene und der Radmittelpunkt ermittelt werden, dadurch gekennzeichnet, dass zumindest auf das Rad (5) und die umgebende Karosserie mit von mindestens einer1. A method for the optical chassis measurement at a test station, in which detected by a plurality of optically distinguishable characteristic structures on a vehicle at least one wheel and a surrounding body panel radiation detected by a measuring device by means of an image pickup device and by evaluating obtained by the detected radiation position data at least the wheel plane and the wheel center are determined, characterized in that at least on the wheel (5) and the surrounding body with at least one
Strahlungsquelle der Messvorrichtung abgegebenem strukturiertem Licht mehrere Ebenen (12, 12') projiziert werden und der Schnitt der Ebenen (12) mit dem Rad (5) und der umgebenden Karosserie oder einem Teilbereich daraus mittels mindestens einer Bildaufnahmeeinrichtung auf der Grundlage der geometrisch bekannten Zuordnung von der mindestens einen Strah- lungsquelle und der mindestens einen Bildaufnahmeeinrichtung als Profillinien (14, 14') aufgenommen werden, und dass ggf. aus Schnittpunkten der Profillinien (14, 14') und dem Felgenrand oder anderen rotationssymmetrischen Konturen am Rad sowie dem Radausschnitt der Karosserie als Positionsdaten die räumliche Lage charakteristischer Oberflächenpunkte bestimmt werden, aus de- nen die interessierenden Fahrwerksdaten bestimmt werden.Radiation source of the measuring device emitted structured light several levels (12, 12 ') are projected and the intersection of the planes (12) with the wheel (5) and the surrounding body or a sub-area thereof by means of at least one image pickup device on the basis of the geometrically known assignment of the at least one radiation source and the at least one image recording device are recorded as profile lines (14, 14 '), and if necessary from intersections of the profile lines (14, 14') and the rim edge or other rotationally symmetrical contours on the wheel and the wheel cutout of the body the spatial position of characteristic surface points from which the chassis data of interest are determined are determined as position data.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass über die Projektion der Ebenen gezielt Einzelprofile oder die gesamte Oberflächenstruktur der interessierenden Objektausschnitte zumindest des Rades (5) und des Karosserieausschnitts aufgenommen werden.2. The method according to claim 1, characterized that targeted individual profiles or the entire surface structure of the object sections of interest, at least of the wheel (5) and of the body cutout, are recorded via the projection of the planes.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass ein Lichtschnittverfahren, ein Gray-Code- Verfahren mit codiertem Lichtansatz oder ein Phasenshift- Verfahren angewandt wird.3. The method according to claim 1 or 2, characterized in that a light-section method, a Gray code method with coded light approach or a phase shift method is applied.
4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zum Bestimmen der Radebene, des Radmittelpunktes und ggf. des Karosserieausschnitts um das Rad eine Vielzahl von Oberflächenpunkten als 3D-Punktwolke, mindestens jedoch drei Schnittpunkte zwischen zwei Oberflächenprofilen und rotationssymmetrischen Konturen des Rades herangezogen werden4. The method according to any one of the preceding claims, characterized in that for determining the wheel plane, the wheel center and possibly the body cutout around the wheel used a plurality of surface points as a 3D point cloud, but at least three points of intersection between two surface profiles and rotationally symmetrical contours of the wheel become
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass aus der Kante des Radausschnitts der Beladungszustand des Rades und aus der Radebene und dem Radmittelpunkt Spur und Sturz bestimmt werden.5. The method according to any one of the preceding claims, characterized in that from the edge of the Radausschnitts the loading condition of the wheel and from the wheel plane and the wheel center track and camber are determined.
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass bei der Abtastung signifikante Oberflächenmerkmale am Rad wie Ventil, Lochbild, Be- schriftung, Schmutz und/oder eine Beschädigung detektiert werden und dass auf der Grundlage dieser Oberflächenmerkmale bei rotierendem Rad ein Felgenschlag er- fasst und bei der weiteren Auswertung berücksichtigt wird.6. The method according to any one of the preceding claims, characterized in that significant surface features on the wheel such as valve, hole pattern, lettering, dirt and / or damage are detected in the scan and that on the basis of these surface features with a rotating wheel a rim he - taken and taken into account in the further evaluation.
7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Messung während einer Vorbeifahrt des Fahrzeugs durchgeführt wird und Fahrtrichtungsdaten aufgrund einer Erfassung der Bewegungsrichtung von Karosserie-Oberflächenstrukturen gewonnen werden. 7. The method according to any one of the preceding claims, characterized in that the measurement is carried out while driving past the vehicle and driving direction data are obtained due to detection of the direction of movement of body surface structures.
EP06819529A 2005-12-29 2006-11-16 Method for optically measuring a chassis Withdrawn EP1969309A1 (en)

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DE102005063083A DE102005063083A1 (en) 2005-12-29 2005-12-29 Optical chassis measurement method for use at test station, involves adapting sizes of object section after localization of interested object structures to different vehicle types and rim sizes
PCT/EP2006/068545 WO2007080014A1 (en) 2005-12-29 2006-11-16 Method for optically measuring a chassis

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