Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N25/00—Investigating or analyzing materials by the use of thermal means
  • G01N25/72—Investigating presence of flaws
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
  • G01M3/00—Investigating fluid-tightness of structures
  • G01M3/002—Investigating fluid-tightness of structures by using thermal means

Definitions

• the invention relates to a method and a device for leak testing of a vehicle according to the preambles of the independent claims.
• DE 3744233 A1 discloses a device for leak testing of a vehicle, by means of which, following an irrigation of the vehicle
• Vehicle interior of the vehicle can be examined by means of a detector unit for an entry of water. Between a vehicle floor and this lining waterproof carpet flooring molding is a large area
• Carrier body arranged with capillary nature.
• the carrier body comprises a pair of wire-shaped electrodes which are extended over the surface thereof and have two terminal contacts for connection to a tester. Since in the dry state, the electrical resistance between the two electrodes is very high, however, this resistance changes when moisture absorption of the support body due to its capillary nature, can on the tester
• Moisture is read off and, if necessary, visually and / or acoustically displayed.
• DE 198 15 062 C2 discloses a method for leak testing a vehicle, in which the vehicle is irrigated by means of an irrigation device and then a vehicle interior of the vehicle is examined by means of a detector unit for an entry of water. Between a floor panel of a body of the vehicle and an electrically conductive layer, which is disposed over the inner surface of the floor panel so that there is a gap between the floor panel and the conductive layer, an electric voltage is applied. The capacity of the bottom plate and conductive layer assembly is measured, and it is determined from the measured capacitance whether water has accumulated between the bottom plate and the conductive layer. Summary of the invention
• the object is achieved with the device and the method for leak testing of the independent claims.
• the vehicle is irrigated by means of an irrigation device and subsequently a vehicle interior of the vehicle is examined by means of a detector unit for an entry of water.
• a detector unit for an entry of water According to the invention, after the vehicle has been watered, at least one partial area of the vehicle interior is replaced by a vehicle
• Thermography unit of the detector unit generates a thermographic recording.
• the water is tempered prior to watering the vehicle to a different temperature from the vehicle. Temperature differences between respective vehicle components and the water can then be detected by means of the thermographic unit of the detector unit. Even if thermal equilibration takes place between, for example, bodywork and water, the heat released by the evaporation of the water is high enough to maintain or measure a corresponding temperature difference. Due to the different temperature between the water and the test specimen, it is basically possible to remove hidden water, e.g. behind cowlings, carpets or in body components such as sills due to its cooling / warming effect.
• the water used for irrigation may have approximately the same temperature as the vehicle to be examined.
• Thermography unit can in this case by the evaporation of water
• the invention relates to the use of a thermography-based diagnosis of leaks of the vehicle on sheets, trim parts and the like, so that a water entry in the vehicle interior, for example on carpets, seats and the like can be detected.
• irrigation or sprinkling of the vehicle may in particular use water that is either colder or warmer than the vehicle parts to be inspected.
• a substantially simplified leak test of a vehicle is made possible by the method according to the invention, since, in contrast to the prior art, no additional, possibly complex equipment for the detection of penetrated water in the vehicle interior are to be mounted inside the vehicle. Nevertheless, the leak test of the vehicle can be carried out particularly reliably, and this can be done very quickly and inexpensively at the same time.
• thermographic camera is used as the thermographic unit of the detector unit.
• the thermographic camera can be, for example, a thermal imaging camera, by means of which corresponding temperature differences between wetted with water and not wetted by water components of the vehicle interior can be easily detected.
• Vehicle interior is generated, which are wetted with the water, as well as those portions of the vehicle interior, which are not wetted with water.
• thermographic images of the at least one portion of the vehicle after the watering of the vehicle over a predetermined period of time, a plurality of thermographic images of the at least one portion of the
• Image processing software used with their help penetrated water can be recognized as such. This includes both the detection of
• Temperature difference of the water used may include the use of temperature thresholds, pattern recognition e.g.
• Vehicle interior include.
• the detector unit is moved by means of a robot in the vehicle interior, while at least one thermographic recording of the at least one portion of the vehicle interior is generated by means of the detector unit.
• thermographic camera As an alternative to a procedure in which a thermographic camera is successively positioned on different vehicle areas by means of a robot, it is also possible to use a plurality of thermographic cameras which are directed at different vehicle interiors and measure these areas simultaneously.
• the at least one thermographic image of at least one partial region of the vehicle interior is generated, which is covered by at least one component of the vehicle interior relative to the detector unit. So that's it It is also possible to check those parts of the vehicle interior which are not directly in the field of vision of a tester or the detector unit. Thus, a moisture detection even in hard to reach areas of the
• the at least one portion of the vehicle interior is heated after watering the vehicle, after which and / or while the thermographic recording of the at least one heated portion of the vehicle interior is generated by means of the detector unit.
• an active, in particular pulse-like, heating of the area of the vehicle interior to be examined is carried out.
• Vehicle interior a particularly accurate leak test of the vehicle can be performed.
• An inventive device for leak testing of a vehicle comprises an irrigation system, by means of which the vehicle is irrigated and
• a vehicle interior of the vehicle with a detector unit of the device can be examined for an ingress of water.
• thermographic image can be generated at least from a partial region of the vehicle interior by means of the detector unit.
• the water can be tempered prior to watering the vehicle to a different temperature of the vehicle.
• Advantageous embodiments of the method according to the invention are to be regarded as advantageous embodiments of the device, in which case in particular the device comprises means with which the method steps can be carried out.
• Fig. 1 is a schematic view of a vehicle, which below a
• Irrigation device is arranged, wherein adjacent to the vehicle, a robot is arranged on which a detector unit is mounted, by means of which a vehicle interior of the vehicle can be examined for an ingress of water;
• FIG. 2 is a perspective view of an entry area of the one shown in FIG.
• FIG. 3 shows a thermographic photograph of the boarding area shown in FIG. 2, wherein a course of the water can be seen, which has penetrated into the boarding area following an irrigation of the vehicle with the irrigation device shown in FIG. 1.
• FIG. 1 shows a schematic view of a vehicle 10 which is arranged below an irrigation device 12.
• a robot 14 Next to the vehicle 10 is a robot 14, which carries a detector unit 16, by means of which an irrigation of the vehicle 10 by the irrigation device 12 one
• the detector unit 16 comprises a thermographic unit 20, by means of which, in particular after the vehicle 10 has been watered, at least one partial area of the vehicle 10 is illuminated
• thermography unit 20 is designed as a thermographic camera, in particular as a thermal imaging camera, by means of which a detection of moisture, in particular in the vehicle interior 18 of the vehicle 10 can be performed.
• the vehicle 10 is connected to the final assembly by means of the
• Irrigation device 12 irrigated.
• the irrigation device 12 may be any system, such as a sprinkler or
• Spray system act, by means of which the vehicle 10 are sufficiently irrigated can.
• the vehicle interior 18 is examined by means of the detector unit 16 for an entry of water.
• the water is tempered prior to watering the vehicle to a different temperature of the vehicle 10.
• a thermographic image is generated by a selected subarea of the vehicle interior 18 by means of the thermographic unit 20 of the detector unit 16.
• a thermographic recording of both partial areas of the vehicle interior 18 is generated, which are wetted with water, as well as of such portions of the
• a so-called difference image analysis can be carried out by comparing thermographic images which on the one hand show the moistened and non-moistened partial regions of the vehicle interior 18.
• thermographic unit 20 designed as a thermal imaging camera. Even if a temperature equalization should take place between a heat conduction between, for example, the body of the vehicle 10 and the water, an outflow of heat arising from the evaporation of the water is still great enough to be able to detect corresponding temperature differences. Of course, this is even easier with poorly heat-conducting materials, for example upholstery fabrics or carpets.
• image processing program the thermographic images can be visualized with regard to leaks. During the thermography-assisted leak test leaks can be detected on sheets, trim parts, carpets, seats and the like.
• thermographic images of the at least one partial area of the vehicle interior 18 are generated over a predetermined period of time.
• a time-resolved thermographic measurement is performed, which allows statements about propagation patterns and propagation velocities of the water and a respective drying rate. In other words, therefore, the course of the water can be observed, so that not only the moist spots themselves can be detected, but also their causes can be identified in the form of leaks.
• the detector unit 16 is moved by means of the robot 14 in the vehicle interior 18, while the thermographic images of the vehicle interior 18 are generated by means of the detector unit 16. This allows a particularly systematic and repeatable leak test of the vehicle 10, in particular the
• measurements can be carried out at the back on points exposed to water, and due to a local reduction in the temperature of the respective carrier material due to the evaporative cooling, such areas acted upon with water, in particular within the vehicle interior 18, can be detected. This can be done so long as reliable manner, as the thickness of the respective carrier material is sufficiently low.
• at least a portion of the vehicle interior 18 may be heated after watering the vehicle 10, after which and / or while the thermographic recording of the at least one heated portion of the vehicle interior 18 is generated by means of the detector unit 16. A moistened with moisture part would then give off a portion of the heat energy to the water and have a lower temperature than surrounding components that are not wetted with water, so that correspondingly moist locations within the vehicle interior 18 can be detected in a simple manner.
• Vehicle interior 18 can be carried out automatically. In combination with the guided by the robot 14 detector unit 16 thus a fully automated leak test of the vehicle 10 can be realized. Alternatively, the detector unit 16 can also be moved manually to the relevant locations in the vehicle interior; By such manual positioning of the detector unit 16, the quality of the findings can be increased.
• FIG. 2 a partial area of an access area 22 of the vehicle 10 shown in FIG. 1 is shown in a perspective view.
• the present case is due to the bright Entry-level paints 22 it is difficult or impossible to detect a water that has penetrated after irrigation.
• Fig. 3 is a thermographic image 24 of the shown in Fig. 2
• thermographic recording 24 in a particularly simple manner. Characterized in that also by means of the thermographic recording 24 a profile of the water 26 can be seen, a diagnosis is made possible in a particularly simple manner, where the water 26 has penetrated.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• General Health & Medical Sciences (AREA)
• Immunology (AREA)
• Pathology (AREA)
• Examining Or Testing Airtightness (AREA)

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Publications (2)

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Cited By (3)

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Citations (2)

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• 2012
  • 2012-04-14 DE DE201210007559 patent/DE102012007559A1/de not_active Withdrawn
• 2013
  • 2013-04-12 WO PCT/EP2013/057746 patent/WO2013153223A2/fr not_active Ceased
  • 2013-04-12 EP EP13725084.1A patent/EP2836819A2/fr not_active Withdrawn

Patent Citations (2)

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