Classifications

• • 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
  • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
  • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
  • G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
  • G01M3/165—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means by means of cables or similar elongated devices, e.g. tapes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62D—MOTOR VEHICLES; TRAILERS
  • B62D65/00—Designing, manufacturing, e.g. assembling, facilitating disassembly, or structurally modifying motor vehicles or trailers, not otherwise provided for
  • B62D65/005—Inspection and final control devices
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
  • G01M17/00—Testing of vehicles
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
  • G01M17/00—Testing of vehicles
  • G01M17/007—Wheeled or endless-tracked vehicles

Definitions

• the invention described below relates to a method for leak testing a motor vehicle body and a motor vehicle body with a suitable test device.
• the described invention was based on the object of providing an improved procedure for leak testing a motor vehicle body.
• the invention proposes the method for leak testing a motor vehicle body with the features mentioned in claim 1 and the motor vehicle body with the features mentioned in claim 6. Developments of the invention are the subject of dependent claims.
• the method according to the invention always comprises the four immediately following steps a. until there. Applying electrically conductive contacts to at least one inside of the motor vehicle body to be checked for leaks, b. Applying an electrical voltage between the contacts, c. Applying water to at least one outer side of the motor vehicle body, and d. Monitoring of the voltage applied between the contacts for the purpose of detecting a voltage drop that may occur.
• the process is particularly characterized by the following additional step e. from: e. At least one of the electrically conductive contacts is formed from a lacquer composition which, in addition to an organic binder, contains a proportion of at least one electrically conductive additive.
• the method according to the invention permits testing for water penetrated into a motor vehicle body with very simple means and with only a very short expenditure of time.
• the method also enables a determination of where water has entered the body. This is achieved in that the conductive contacts made from the lacquer composition are indeed have electrical conductivity, but this is not nearly as high as the electrical conductivity of conductor tracks made of a metallic material such as copper. This can be used, as will be explained below.
• the method is additionally characterized by at least one of the immediately following additional steps and / or features a. to c. from: a.
• the coating composition comprises an electrically conductive carbon modification.
• the carbon modification is carbon black, graphite, graphene or carbon na notu bes.
• the paint composition comprises a metallic powder ver as an electrically conductive additive.
• the coating composition comprises an electrically conductive polymer, in particular as the electrically conductive additive, for example poly-3,4-ethylenedioxythiophene (PEDOT) or polyaniline (PAni) or polypyrrole (PPy).
• the electrically conductive additive carbon black is particularly preferred.
• the method is additionally characterized by at least one of the immediately following additional features a. to c. from: a.
• the carbon modification is carbon black or graphite, which is added to the coating composition in a proportion in the range from 5 to 80% by weight, based on the solids content of the coating composition.
• the carbon modification is carbon black or graphite, which is added to the coating composition in a proportion in the range from 5 to 50% by weight, based on the solids content of the coating composition.
• the carbon modification is carbon black or graphite, which is added to the coating composition in a proportion in the range from 5 to 25% by weight, based on the solids content of the coating composition. In all cases, electrically conductive contacts are obtained whose conductivity is below the specific electrical conductivity of the carbon black or graphite used.
• the immediately preceding feature c is particularly preferred.
• the method is additionally characterized by the immediately following additional feature a. from: a.
• the electrically conductive additive is added to the coating composition in an amount such that the at least one conductor track with a specific electrical resistance in the range from 100 Q * mm 2 / m to 5 * 10 5 Q * mm 2 / m (at 20 ° C) is formed.
• the required amount of the additive can easily be determined by experiments.
• the electrically conductive contacts can in principle be connected to any voltage source.
• the voltage source like the electrical contacts, is applied to the at least one inside.
• the voltage source can be, for example, an electrochemical cell that has stored electrical energy statically or electrochemically, in particular a printed electrochemical cell.
• Printing electrochemical cells is state of the art.
• negative electrodes comprising zinc particles and positive electrodes comprising brown stone particles can be printed next to one another on the at least one inside and connected to one another via an electrolyte.
• the negative electrode is printed directly on one of the electrically conductive contacts and the positive electrode is printed directly on another of the electrically conductive contacts, so that a current flows when the contacts are electrically connected to one another.
• an electrical component in particular a coil, to serve as the voltage source, into which an electrical voltage can be induced under the influence of a magnetic field.
• the electrically conductive contacts themselves have a structure or a partial structure into which an electrical voltage can be induced. A separate rate voltage source is then not required to apply the electrical voltage between the contacts.
• the method is additionally characterized by the immediately following additional feature a. from: a.
• the coating composition comprises a binder based on polyurethane.
• binder for the present invention is not particularly critical.
• the at least one inner side provided that it is not already electrically insulating, in some preferred embodiments, before the application of the electrically conductive contacts, at least in the areas in which the electrically conductive contacts are applied, with an electrically insulating lacquer layer is covered.
• the electrically insulating lacquer layer is particularly preferably printed.
• Motor vehicle bodies according to the invention are always distinguished by the following features: a. They have electrical contacts on the inside, and b. at least one of the contacts is formed from the coating composition described above, which in addition to an organic binder contains a proportion of at least one electrically conductive additive.
• the motor vehicle body is additionally characterized by at least one of the immediately following additional features a. to d. out: a.
• the inside with the electrical contacts is coated with an electrically insulating lacquer on which the electrical contacts are arranged.
• the electrical contacts are in the form of parallel conductor tracks.
• the parallel conductor tracks are at an average distance from one another in the range from 1 mm to 10 cm, preferably in the range from 5 mm to 10 cm.
• the parallel conductor tracks each have a length in the range from 10 cm to 100 m, preferably between 1 m and 10 m.
• At least the features a are particularly preferred. and b. preferably even the features a. to d., realized in combination with each other.
• the motor vehicle body is additionally characterized by the immediately following additional feature a. from: a.
• the inside with the electrical contacts is the bottom of the motor vehicle.
• the claimed motor vehicle body comprises a voltage source that is electrically connected to the electrical contacts on the inside.
• a voltage source that is electrically connected to the electrical contacts on the inside.
• This can be, in particular, an electrochemical cell which has stored static or electrochemical electrical energy, or an electrical component, in particular a coil, into which an electrical voltage can be induced under the influence of a magnetic field.
• the electrically conductive contacts themselves can have a structure or a partial structure into which an electrical voltage can be induced.
• Fig. 1 is a plan view of the inside of a floor panel of a motor vehicle body according to the invention.
• the two conductor tracks 102 and 103 which run parallel to one another are applied.
• the two conductor tracks are each formed from a coating composition which, in addition to a polyurethane-based binder, contains a proportion of conductive carbon black as an electrically conductive additive.
• the conductor tracks are applied with a width of approx. 5 mm. The distance between the conductor tracks is 5 mm on average.
• composition of the paint composition was as follows:
• the conductor tracks 102 and 103 produced in this way have an electrical conductivity. However, this is less than that of electrical conductors such as copper. If the two conductor tracks 102 and 103 are electrically connected to one another, the location of the connection can be estimated via a voltage measurement, since the observed voltage drop - in relation to copper - depends much more on the respective length of the conductor tracks.
• the conductor track 102 is connected to the negative pole and the conductor track 103 to the positive pole of the voltage source 106.
• the voltage applied between the conductor tracks is monitored by means of the voltage measuring device 107.
• the conductor track 102 and the conductor track 103 are electrically connected to one another, for example via the water puddle 104 or the water puddle 105, a voltage drop can be observed.
• the remaining residual voltage can provide information about the distance from the voltage source the interconnects have been interconnected.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Manufacturing & Machinery (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
• Motor Or Generator Frames (AREA)
• Examining Or Testing Airtightness (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=67704532

Family Applications (1)

Country Status (9)

Families Citing this family (4)

Family Cites Families (11)

• 2018
  • 2018-08-28 DE DE102018214554.7A patent/DE102018214554A1/de not_active Withdrawn
• 2019
  • 2019-08-21 CN CN201980056324.8A patent/CN112585442A/zh active Pending
  • 2019-08-21 JP JP2021506329A patent/JP2021535364A/ja active Pending
  • 2019-08-21 MX MX2021002364A patent/MX2021002364A/es unknown
  • 2019-08-21 EP EP19756368.7A patent/EP3844470A1/de not_active Withdrawn
  • 2019-08-21 CA CA3107084A patent/CA3107084A1/en not_active Abandoned
  • 2019-08-21 WO PCT/EP2019/072407 patent/WO2020043574A1/de unknown
  • 2019-08-21 KR KR1020217008915A patent/KR20210046763A/ko unknown
  • 2019-08-21 US US17/271,325 patent/US20210181054A1/en not_active Abandoned

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