EP3601976A1 - Energy evaluation system - Google Patents
Energy evaluation systemInfo
- Publication number
- EP3601976A1 EP3601976A1 EP18715222.8A EP18715222A EP3601976A1 EP 3601976 A1 EP3601976 A1 EP 3601976A1 EP 18715222 A EP18715222 A EP 18715222A EP 3601976 A1 EP3601976 A1 EP 3601976A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- undergone
- energy
- detecting
- mechanical
- detection member
- 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- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0052—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to impact
Definitions
- the present invention relates to the field of motor vehicles, including the monitoring of the energy level experienced by structural parts or body parts used for the manufacture of motor vehicles.
- the invention relates more specifically to a system for such tracking.
- Parts used for the manufacture of motor vehicles are generally subject, during the life of the vehicle, to mechanical stresses whose origin can be diverse. Indeed, these mechanical stresses can come from impacts with elements outside the vehicle (sidewalks, pedestrians, etc.) or, conversely, result from significant stresses in direct correlation with the function of the part concerned.
- point means such as piezoelectric sensors
- sensors for detecting impacts, or constraints, at the location of the sensors or in a nearby perimeter.
- the aim of the invention is to remedy these drawbacks by providing a system for detecting the energy level undergone by a part of a motor vehicle, comprising at least one member for detecting the mechanical energies undergone by said part, in which the body detection device delimits a closed contour of a surface of said part, and in that the detection member is able to detect the mechanical energies undergone by said part, and able to differentiate the mechanical energies undergone within said delimited surface of mechanical energies undergone outside said bounded area.
- the system of the invention can accurately detect, within a specific area of a motor vehicle part, the energies experienced by the part in the defined area.
- the zone is delimited by the detection member and corresponds to the closed contour of a surface of said part.
- the system of the invention then makes it possible to monitor the impacts that can have, on the defined area of the room, the mechanical events generating strong mechanical stresses that occur within the room and to concentrate this monitoring on the area of the room. interest of the play.
- the detection unit is able to count only the part of the mechanical energy that is propagated in its direction, when this energy enters the area delimited then when it comes out.
- the system comprises a processing unit adapted to process data transmitted by the detection member.
- At least one of the detection members is a sensor piezoelectric. At least one of the detection members may also be an optical fiber.
- the system according to the invention is able to quantify and accumulate the mechanical energies detected within said surface.
- the system according to the invention comprises at least a second detection member positioned within said delimited surface.
- the invention also relates to an assembly of a motor vehicle part and a system for detecting the energy level undergone by the part, the detecting device of the detection system delimiting a specific portion of the part.
- the assembly may further comprise one or more of the following features, taken alone or in combination:
- the detection member is overmolded on the part or integrated into the part during its manufacture
- the piece is a bodywork part, preferably a front face of a bumper
- the room is a structural part, preferably a floor, a spar, a side jamb; a transverse beam or a structural frame of opening;
- the invention also relates to a method for monitoring the energy level experienced by a part of a motor vehicle or a specific portion of said part, said part or said portion being provided with a system for detecting the energy level undergone.
- the method comprising a step of alerting the user when the energy undergone by said part or said portion reaches a predetermined threshold value, whether it is a threshold on the level of energy punctually suffered and / or a threshold on the cumulative energy level undergone.
- the threshold value may be a value representative of the level of energy punctually experienced and / or a value representative of the cumulative energy level undergone by the part or the portion of the part.
- FIG. 1 is a diagram illustrating an assembly of a vehicle part and a system for detecting the energy level undergone by the part according to a first embodiment of the invention
- FIG. 2 is a diagram illustrating the operation of a system for detecting the energy level undergone by the part when an event generating mechanical stresses occurs within the closed contour that it delimits;
- FIG. 3 is a diagram illustrating the operation of a system for detecting the energy level undergone by the part when a stress-generating event mechanics occurs outside the closed contour that it delimits;
- FIG. 4 is a diagram illustrating an assembly of a vehicle part and a system for detecting the energy level undergone by the part according to a second embodiment of the invention.
- This system 1 comprises at least one detecting member 11 of the mechanical energies undergone by said piece (2, 4).
- This detection member 11 may be connected to a processing unit (not shown) which is able to process the data transmitted by the detection member 11 according to different predefined parameters.
- the detection member 11 delimits a closed contour of a surface of the part. Within the surface defined by the closed contour 3, the mechanical energies experienced by the part are detected by the member 11. In Figures 1 to 4, the sensing member 11 forms a loop.
- the detection member 11 is able to differentiate the mechanical energies undergone within the delimited surface 3 from the mechanical energies undergone outside the delimited surface 3.
- the set of data of the detection unit 11, representing the mechanical energies undergone by the part within the zone delimited by the detection element 11, can be processed by the processing unit in order to monitor and accumulate the level of energy that pass through the defined area 3 of the room, throughout the life of the vehicle.
- At least one of the detection members is a piezoelectric sensor.
- This piezoelectric sensor may, for example, be made from a poly (vinylidene fluoride) film (or PVDF film) of which only the outer loop is activated.
- This sensor is then connected to the processing unit via cables.
- This sensor transmits a signal that can be filtered by the processing unit and also be calibrated to record the resonant energies at specific frequencies. This calibration makes it possible not to take into account the low energies that can come from events whose accounting is not desired, for example because they generate low energy levels that do not impact the room or the zone of the specifically supervised room.
- At least one of the detection members may also be an optical fiber whose operation is similar to that of a piezoelectric sensor.
- the detection member 11 may delimit a flat surface, as illustrated in FIG. 1, or a volume as illustrated in FIG. 4. This difference depends in particular on the type of part which one wishes to ensure the detection and the monitoring of the level of energy undergone. Indeed, the events generating mechanical energies may be of different nature for a structural part 4 ( Figure 4) and for a bodywork part 2 ( Figure 1).
- the operation of the detection system 1 remains identical and makes it possible to differentiate the mechanical energies undergone within the surface delimited by the sensor 11 from those undergone by the part or the vehicle outside the surface. bounded 3.
- This differentiation operates as follows: when a mechanical stress generating event occurs within the delimited surface 3, as illustrated in FIG. 2, the resulting mechanical energies of these stresses propagate in all directions. These energies are counted once by the sensor 11 before leaving the delimited surface 3.
- FIG. 3 represents the case where the event occurs outside the delimited surface 3.
- the part of the mechanical energies that goes towards the piezoelectric sensor 11 is detected.
- This part of the mechanical energies coming from outside the delimited surface 3 is counted twice by the sensor 11, when it enters the delimited surface 3 and when it leaves. For example, this energy will be counted positively during the exit of the zone and negatively when entering the delimited surface 3. Therefore, the balance of the energies undergone is zero in the case of an event that occurs outside of the delimited surface 3.
- the attenuation of the energy during the propagation through the delimited surface 3 is managed by the algorithm of the processing unit.
- Another alternative may be, for example, to attenuate the signal that enters the loop, with a specific piezoelectric sensor, whose properties can detect and transmit energies that are only very low energies. Therefore, the system 1 is able to recognize that the energy detected does not come from an event that occurred within the delimited surface 3.
- the system 1 comprises a second detection member, of the same type as the detection member 11 previously described.
- This second detection member is positioned within the surface delimited by the first detection member 11. In other words, the second detection member is positioned in the loop formed by the first detection member 11.
- the surfaces delimited by each of the detection members are substantially equal (at the surface near the second detection member).
- the closed contours delimited by each of the detection members are close to each other, or even in contact over the entire periphery of the closed contour delimited by the second detection member.
- the first detection member 11 and the second detection member form two concentric circles, whose diameters are very close.
- Such a system makes it easier and more certain to identify the direction of propagation of the energy, because of the successive detection of the energy by the two detection members.
- the energy resulting from this event is first detected by the second detection member, then by the first detection member. 11.
- the detection order is inverted for an event that occurs outside the area delimited by the two detection members.
- the system according to this particular embodiment also makes it possible to check the correct operation of the system 1, by comparing the positive or negative counting of one of the detection members, with the accounting of the other detection member. Therefore, the information provided by the system 1 according to this embodiment of the invention is safer.
- the system 1 is then able to not take into account the mechanical energies detected in this case.
- the system 1 is thus able to quantify and accumulate the mechanical energies detected within the delimited surface 3.
- the system 1 allows a more precise monitoring of the demarcated surface 3 of the part because it is possible to detect, quantify and cumulate all the energies resulting from events impacting the delimited area, and this, throughout the life of the vehicle.
- the data transmitted by the detection member are processed differently by the processing unit.
- the events likely to occur are shocks or impacts with elements external to the vehicle.
- a large part of the bumper 2, shown in FIG. 1 is placed under surveillance thanks to the system 1 of the invention which is provided with a sensor 11, delimiting a large surface 3 of the bumper 2. It is possible, in the case for example, to monitor and alert the user when the shocks (or any other event impacting the bumper) have generated a mechanical energy level experienced by the bumper which exceeds the critical threshold beyond which the bumper is more able to guarantee the protection of the user in case of future shocks.
- the system 1 also makes it possible to monitor certain areas of rooms for which the major stresses undergone are in direct correlation with their function.
- the mechanical stresses result more often from significant stresses in direct correlation with the function of the structural part concerned.
- This is for example the case of a front floor 4 in which there are seat fasteners 5, or the case of a seatbelt fastener on a foot or a case of the anchoring of a seat. metal reinforcement insert or hinge or lock.
- Such a zone is caused to undergo numerous deformations throughout the life of the vehicle, by the movements of the seat or by the load that it supports. These deformations can be quantified by the system 1 by positioning the detection member around the seat fastener. Indeed, the mechanical energies generated by these deformations will pass through the seat attachment 5 and thus reach the zone 3 delimited by the detection member 11.
- the system 1 also makes it possible to detect and quantify the damage to the delimited surface 3 of the part once the stress-generating event is completed. For example, the system 1 makes it possible to monitor the propagation, within the delimited surface 3, of cracks or micro-cracks resulting from a shock or a significant stress on the part 4 produced in the past.
- the system 1 makes it possible to optimize the dimensioning of the parts placed under surveillance. Indeed, it is possible with the system 1, to confirm or deny the levels of solicitation of zones, suspected at risk, but for which a monitoring of the level of mechanical energy undergone was, until now, not possible. For security reasons, the current trend is to oversize parts, with all the disadvantages that entails. Therefore, it is possible with the system of the invention to size the parts, for future vehicles, according to actual needs.
- the invention also relates to an assembly of a part 2, 4 of a motor vehicle and a system 1 for detecting the level of energy experienced by the part according to the invention.
- the detection member 11 delimits a specific portion 3 of the part.
- the detection member 11 can also be connected to the part by any known means those skilled in the art that allow a cohesive bonding of two elements.
- the detection member 11 may be glued, adhesively bonded, welded or, advantageously, overmoulded on the surface of the part of which it delimits an area.
- the motor vehicle part can be a bodywork part 2, such as a front face of a bumper, or a structural part 4, such as a floor.
- the motor vehicle part 4 is a floor and the specific portion 3 is the periphery of a seat attachment.
- the invention also relates to a method of monitoring the energy level experienced by a part 2, 4 of a motor vehicle or a specific portion 3 of the part, the part or the portion being provided with a system 1 for detecting the energy level undergone according to the invention.
- the method comprises a step of alerting the user when the energy experienced by the part or the portion reaches a predetermined threshold value, whether it is a threshold on the energy level punctually suffered and / or a threshold on the level. cumulative energy suffered.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1752757A FR3064742B1 (en) | 2017-03-31 | 2017-03-31 | ENERGY EVALUATION SYSTEM |
PCT/FR2018/050699 WO2018178544A1 (en) | 2017-03-31 | 2018-03-22 | Energy evaluation system |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3601976A1 true EP3601976A1 (en) | 2020-02-05 |
Family
ID=58670071
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18715222.8A Withdrawn EP3601976A1 (en) | 2017-03-31 | 2018-03-22 | Energy evaluation system |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3601976A1 (en) |
FR (1) | FR3064742B1 (en) |
MA (1) | MA48986A (en) |
WO (1) | WO2018178544A1 (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6370964B1 (en) * | 1998-11-23 | 2002-04-16 | The Board Of Trustees Of The Leland Stanford Junior University | Diagnostic layer and methods for detecting structural integrity of composite and metallic materials |
US7398698B2 (en) * | 2005-11-03 | 2008-07-15 | The Boeing Company | Smart repair patch and associated method |
-
2017
- 2017-03-31 FR FR1752757A patent/FR3064742B1/en not_active Expired - Fee Related
-
2018
- 2018-03-22 WO PCT/FR2018/050699 patent/WO2018178544A1/en active Application Filing
- 2018-03-22 EP EP18715222.8A patent/EP3601976A1/en not_active Withdrawn
- 2018-03-22 MA MA048986A patent/MA48986A/en unknown
Also Published As
Publication number | Publication date |
---|---|
FR3064742B1 (en) | 2019-05-03 |
MA48986A (en) | 2020-02-05 |
WO2018178544A1 (en) | 2018-10-04 |
FR3064742A1 (en) | 2018-10-05 |
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