WO2014033086A1 - Appareil de synchronisation de caméras dans un système d'alignement de roues de véhicule et procédé associé - Google Patents

Appareil de synchronisation de caméras dans un système d'alignement de roues de véhicule et procédé associé Download PDF

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Publication number
WO2014033086A1
WO2014033086A1 PCT/EP2013/067622 EP2013067622W WO2014033086A1 WO 2014033086 A1 WO2014033086 A1 WO 2014033086A1 EP 2013067622 W EP2013067622 W EP 2013067622W WO 2014033086 A1 WO2014033086 A1 WO 2014033086A1
Authority
WO
WIPO (PCT)
Prior art keywords
measurement head
measurement
transceiver
heads
synchronizing
Prior art date
Application number
PCT/EP2013/067622
Other languages
English (en)
Inventor
Mahesh YADAV
Vishal KALE
Chandrasekaran KANDASAMY
Mangalaprasad BELMANJE
Oleg SCHILLER
Vikresh GYANANI
Original Assignee
Robert Bosch Gmbh
Robert Bosch Engineering And Business Solutions Limited
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, Robert Bosch Engineering And Business Solutions Limited filed Critical Robert Bosch Gmbh
Publication of WO2014033086A1 publication Critical patent/WO2014033086A1/fr

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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
    • G01B11/26—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
    • G01B2210/12—Method or fixture for calibrating the wheel aligner
    • 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
    • G01B2210/14—One or more cameras or other optical devices capable of acquiring a two-dimensional image
    • G01B2210/143—One or more cameras on each side of a vehicle in the main embodiment

Definitions

  • the invention relates to vehicle wheel alignment systems.
  • the invention relates to synchronizing the operation of the measurement heads in a vehicle wheel alignment system.
  • Vehicle wheel alignment systems include a plurality of head with cameras or similar image capturing means. The alignment angles of the wheel, i.e. toe, camber and caster is determined from the images captured by the cameras on the heads.
  • the heads for the wheel alignment systems need to be synchronized in operation with each other.
  • the cameras on each of the heads should capture image at the same instant to achieve accurate measurement of the misalignment angles.
  • the heads that are presently used are synchronized by wired means which may result in inclusion of delay in the operation and thus the synchronized operation of the cameras on the heads is not maintained.
  • the present invention discloses a device for vehicle wheel alignment comprising; a measurement head positioned facing each of the wheels of said vehicle.
  • Each of the measurement head comprises an image capturing means, a pair of wireless transceivers and a control unit for synchronizing the operation of said measurement heads.
  • the present invention achieves accurate synchronization of the measurement heads in a vehicle wheel alignment system. Due to the optical transmission of the synchronization pulse between the heads, the delay introduced during transmission is almost negligible. As the measurement heads are synchronized in operation the image capturing elements capture the image at the same instant. Thus, the misalignment angles that are measured are more accurate.
  • Fig. 1 illustrates a vehicle wheel alignment with synchronizing means in accordance with the present invention
  • Fig. 2 illustrates a flowchart showing the method of synchronization of a vehicle wheel alignment system in accordance with the present invention.
  • Fig. 1 of the accompanying drawing illustrates a device (10) for vehicle wheel alignment system with synchronizing means in accordance with the present invention.
  • the vehicle wheel alignment system includes a measurement head (12) which is positioned facing each of the wheels of said vehicle.
  • Each of the measurement head (12) includes an image capturing means (14), a pair of wireless transceivers (16a, 16b) and a control unit (18) for synchronizing the operation of the measurement heads (12).
  • the image capturing means (14) is a camera.
  • the transceivers (16a, 16b) are optical in nature. These include laser transmitters, LEDs, infrared LEDs and corresponding suitable receiving or detecting means.
  • Each measurement head (12) has two transceivers.
  • Each of the transmitter receiver pair (16a, 16b) is positioned to establish optical link with at least two other transmitter receiver pairs. Since there are two pairs of transceivers (16a and 16b) on each of the measurement heads, the transmission of the synchronization pulse can happen bi-directionally, i.e. clockwise or anti-clockwise. In case there is an obstruction to the path of the optical link in one direction, then the direction of transmission can be reversed and the synchronization can be achieved.
  • one of the measurement heads (12) acts as a master and remaining measurement heads (12) act as slaves and synchronize with the master measurement head (12).
  • the master measurement head (12) generates a synchronizing pulse which is transmitted optically, starting from the master measurement head (12) to all the slave measurement heads (12) sequentially. Controller (18) of each measurement head (12) on receiving the synchronizing pulse synchronizes itself with the master measurement head (12).
  • Fig. 2 illustrates a flowchart for a method for synchronizing the image capturing means in a vehicle wheel alignment system.
  • the method comprises the following steps.
  • a synchronizing pulse is transmitted by a wireless transceiver (16a) mounted on a master measurement head (12) to a first wireless transceiver (16b) on a slave measurement head (12) facing it, (SO).
  • the synchronizing pulse is transmitted from the first wireless transceiver (16b) on the slave measurement head (12) to a second transceiver (16a) on the same slave measurement head (12) facing another slave measurement head (12), (S1 ).
  • the synchronizing pulse is transmitted successively from one slave measurement head (12) to the next slave measurement head (12) facing by wireless transceivers (16a), (S2).
  • the last slave measurement head (12) transmits the synchronizing pulse back to the master measurement head (12), (S3).
  • the control unit (18) on each of the slave measurement head (12) synchronizes with the master measurement head (12) on receiving the synchronizing pulse sent by said master measurement head (12) (S4).
  • the control unit (18) on receiving the synchronizing pulse from the transceiver (16b) is adapted to synchronize the operation of the image capturing means (14) with that of the image capturing means (14) on the master measurement head (12), (S5).
  • the transmission of the synchronization pulse can be done from a transceiver (16) of one measurement head (12) to a transceiver (16) of another measurement head in clockwise direction or in anti-clockwise direction.

Abstract

La présente invention concerne un dispositif (10) d'alignement de roues de véhicule. Le dispositif (10) selon la présente invention comprend une tête de mesure (12) positionnée en regard de chacune des roues dudit véhicule. Chacune des têtes de mesure (12) comporte un moyen de saisie d'image (14), une paire d'émetteurs-récepteurs sans fil (16a, 16b) et une unité de commande (18) pour synchroniser le fonctionnement desdites têtes de mesure (12) les unes avec les autres.
PCT/EP2013/067622 2012-08-29 2013-08-26 Appareil de synchronisation de caméras dans un système d'alignement de roues de véhicule et procédé associé WO2014033086A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN3581CH2012 2012-08-29
IN3581/CHE/2012 2012-08-29

Publications (1)

Publication Number Publication Date
WO2014033086A1 true WO2014033086A1 (fr) 2014-03-06

Family

ID=49083665

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2013/067622 WO2014033086A1 (fr) 2012-08-29 2013-08-26 Appareil de synchronisation de caméras dans un système d'alignement de roues de véhicule et procédé associé

Country Status (1)

Country Link
WO (1) WO2014033086A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5421095A (en) * 1993-02-03 1995-06-06 G.S. S.R.L. Procedure for transmission of information in aligning equipment for motor vehicles, and aligning equipment for carrying out the procedure
US5532816A (en) * 1994-03-15 1996-07-02 Stellar Industries, Inc. Laser tracking wheel alignment measurement apparatus and method
US6075589A (en) * 1995-08-02 2000-06-13 Muller Bem Device for the geometric measurement and inspection of wheeled vehicles
US20020080343A1 (en) * 2000-09-02 2002-06-27 Herrmann Bux Wheel alignment apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5421095A (en) * 1993-02-03 1995-06-06 G.S. S.R.L. Procedure for transmission of information in aligning equipment for motor vehicles, and aligning equipment for carrying out the procedure
US5532816A (en) * 1994-03-15 1996-07-02 Stellar Industries, Inc. Laser tracking wheel alignment measurement apparatus and method
US6075589A (en) * 1995-08-02 2000-06-13 Muller Bem Device for the geometric measurement and inspection of wheeled vehicles
US20020080343A1 (en) * 2000-09-02 2002-06-27 Herrmann Bux Wheel alignment apparatus

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