Measuring device for detecting preload force of window glass for frameless vehicle door

Abstract

The present invention relates to a measuring device (1) for detecting the preload force of a frameless door window glass (2) of a vehicle (3), the measuring device comprising at least the following components: a holding device (4) for fixing the measuring device (1) on the door window glass (2) to be tested; an acceleration detection unit (5) for recording spatial acceleration data (6, 7, 8) about the movement of the measuring device (1); and a communication interface (9) for operating the measuring device (1) and reading the acceleration data (6, 7, 8).

Description

Technical Field

[0001] The present invention relates to a measuring device for detecting a preload force of a window glass for a frameless vehicle door, and a measuring method for detecting the preload force of a window glass for a vehicle door using such a measuring device. Background Art

[0002] In vehicle doors with frameless door panes, a defined preload force must be ensured between the door seal and the door pane to minimize wind noise during vehicle operation. To this end, this preload force must be tested and (possibly) adjusted during manufacturing. This preload force results in a movement path for the door pane when the door is opened or closed, from which the preload force resulting from the installation conditions (e.g., the glass height in the z-direction) and the glass rigidity can be deduced. To achieve this, it is known to lock the door in a defined open position and to detect the position of the door pane relative to the door using a measuring probe. During assembly, it is desirable to minimize error susceptibility and to perform as few, simple operations as possible. Summary of the Invention

[0003] Based on this, the basic object of the present invention is to at least partially overcome the disadvantages known from the prior art. The features of the present invention are derived from the measuring device for detecting the preload force of a window pane for a frameless vehicle door, described in the following paragraph. Advantageous embodiments thereof are illustrated in the embodiments described in the "Summary of the Invention" section. The features of the present invention can be combined in any technically appropriate manner. For this purpose, the following description and the features of the accompanying drawings, including supplementary embodiments of the present invention, may also be used.

[0004] The present invention relates to a measuring device for detecting the preload force of a window glass for a frameless vehicle door, the measuring device comprising at least the following components:

[0005] - a holding device for fixing the measuring device to the door window pane to be tested;

[0006] - an acceleration detection unit for recording spatial acceleration data about the movement of the measuring device; and

[0007] - Communication interface for operating the measuring device and reading acceleration data.

[0008] First, it should be clarified that the z-direction is oriented vertically (e.g., parallel to the Earth's gravitational field), the y-direction is oriented transversely to the longitudinal direction of the vehicle (e.g., parallel to the surface normal of a closed door), and the x-direction is oriented along the longitudinal direction of the vehicle (e.g., in the plane of a closed door). Unless expressly stated to the contrary, ordinal numbers used in the above and following descriptions are used solely for clarity and do not reflect any order or sequence of the components referenced. An ordinal number greater than one does not necessarily imply the presence of another such component.

[0009] The measuring device is adapted to detect the preload force of a frameless door window glass of a vehicle. The measuring device can also be used in other application scenarios where the door window glass can be lowered and preloaded.

[0010] The measuring device proposed herein makes it possible to measure the preload force of a vehicle door window pane without a tactile measuring probe. During the measurement, the door does not need to be locked in a predetermined position, and no additional components are required. Closing the vehicle door equipped with the measuring device and then opening it again is sufficient. To perform the measurement, the measuring device can be fixed to the window pane (using a retaining device) while the door is open. The measuring device includes an acceleration detection unit comprising at least one sensor, such as an accelerometer, a gyroscope, a position sensor, and / or other sensors. In one embodiment of a measurement method that can be performed using the measuring device, the sensor system is zeroed, i.e., a starting point is determined, after the door is closed. Opening the door eliminates the seal counterpressure, and the door window pane tilts to its more relaxed or preloaded position. This position change or movement trajectory is detected (in the form of acceleration data) by the acceleration detection unit, optionally evaluated, and read out via a communication interface. For example, the communication interface can be a screen on which at least one expected value can be read out.

[0011] The acceleration data is either transmitted as raw data or has already been processed or interpreted in the measuring device. In one advantageous embodiment, the preload force is provided as an output value that can be read via a communication interface. To this end, such a measuring device includes a corresponding computing unit. Alternatively, an external computing unit is adapted to process the acceleration data and receives the acceleration data from the communication interface of the measuring device as raw data or after intermediate processing, for example as velocity values and / or as displacement values. In one embodiment, the transmitted data is cleaned of measurement value components that are purely attributable to the pivoting of the vehicle door.

[0012] In an advantageous embodiment of the measuring device, it is further provided that, in order to fix the measuring device on the vehicle door window pane to be tested, the holding device comprises:

[0013] - at least one hook for hooking onto the upper window edge of a door window, and / or

[0014] At least one suction cup for releasably adhering to a glass surface of the door window.

[0015] In this embodiment, the measuring device can be fastened to the door pane quickly, simply, and reliably. In a preferred embodiment, a retaining device is used that is adapted, simultaneously or alternatively, to adjust the relative position of the door pane relative to the corresponding door seal for the measuring device. In an advantageous embodiment, the plurality of hooks or the plurality of contact surfaces are formed by a single hook, wherein the retaining device ensures a clearly defined relative position of the measuring device relative to the door pane in a simple and reproducible manner.

[0016] The proposed suction cup allows the measuring device to be fixed to the door window or its glass surface in such a way that the relative movement between the measuring device and the door window is minimal, preferably negligible. Alternatively or additionally, at least one clamping mechanism (e.g., a clamping hook) can be provided.

[0017] In an advantageous embodiment of the measuring device, it is further provided that the door window pane is tilted about a defined tilting axis between a starting point and an end point, the starting point and the end point being solely determined by the preload force of the door window pane to be tested.

[0018] The acceleration detection unit includes a gyroscope, by means of which a rotational acceleration about a rotation axis parallel to the tilt axis can be detected.

[0019] In this embodiment of the measuring method, the tilting movement of the door window pane is taken into account, and only the rotational acceleration, or more precisely the rotational movement, geometrically caused by this tilting movement is considered as a displacement, which is taken into account for the preload force of the door window pane to be tested. In an alternative embodiment, only the tilting movement is recorded, and during this tilting movement, the translational movement of the door window pane is taken into account (for example, only in the direction inwardly of the door, i.e., in the y direction).

[0020] In a supplementary or alternative embodiment, a pivoting movement of the vehicle door, for example about the vehicle vertical direction (z-direction), is converted into a displacement of the vehicle door. This movement is correlated with the geometric relationship required to calculate the movement of the door window pane relative to the tilting or pivoting movement of the door window pane. Specifically, the tilting movement is known from the known geometry of the vehicle door and door window pane, and the measurement at the corresponding measuring position is reliably established by precisely positioning the measuring device on the door window pane. This can be achieved, for example, by using a corresponding hook on the holding device.

[0021] In an advantageous embodiment of the measuring device, it is further provided that the communication interface comprises at least one of the following components:

[0022] -Screen;

[0023] - action buttons; and

[0024] - A transmitter for transmitting acceleration data in a machine-readable manner.

[0025] The position change or movement trajectory of the door window pane is detected by an acceleration detection unit (in the form of acceleration data), possibly evaluated, and read out via a communication interface. For example, the communication interface is a screen on which at least one desired value can be read out. Alternatively or additionally, the communication interface is a transmitter adapted for (preferably wireless) communication with an external system, for example, via a standardized transmission protocol and / or transmission frequency (e.g., WLAN or PAN). Alternatively or additionally, the communication interface is a printer unit, and the at least one desired value can be read out on a printed document.

[0026] In a preferred embodiment, operating buttons are provided, particularly preferably a start button and a stop button, so that the measurement can be started and ended manually. The operating buttons also include a touch-sensitive defined surface, such as a so-called touch screen, so that such operating buttons form at least part of the surface of an existing screen.

[0027] Furthermore, in an advantageous embodiment of the measuring device, it is provided that the holding device and the acceleration detection unit are formed independently of one another, wherein the acceleration detection unit can be releasably fixed in the holding device.

[0028] Preferably, the acceleration detection unit is included in a mobile terminal device, particularly preferably in a smartphone.

[0029] In this embodiment, the retaining device is formed independently of the acceleration detection unit and preferably of the communication interface (which is communicatively connected or communicatively connectable to the acceleration detection unit). Therefore, in a further step, the retaining device can be connected to the vehicle door window pane, wherein the retaining device can preferably be used for other measuring devices. Alternatively or in addition, the acceleration detection unit can be used to perform other measurements, for which other retaining devices may be used. In one advantageous embodiment, the acceleration detection unit is a mobile terminal device that can be used in different locations and is adapted for mobile use. In one advantageous embodiment, the mobile terminal device is adapted for wireless communication. In a particularly advantageous embodiment, such a mobile terminal device is a so-called smartphone, and the measurement method is performed using an application (app for short), preferably using only the sensor device included in the smartphone. The acceleration detection unit is then formed, at least in terms of software, by the (e.g., standardly included) sensor device. The mobile terminal device can be used together with the retaining device as the measuring device mentioned here.

[0030] Furthermore, an advantageous embodiment of the measuring device provides for a calculation unit to be included, by means of which the recorded acceleration data can be converted into a displacement along the movement trajectory of the door window pane corresponding to the preload force of the door window pane to be tested.

[0031] The computing unit or computer-aided device includes one or more processors, such as a general-purpose processor (CPU) or a microprocessor, a RISC processor, a GPU and / or a DSP. For example, the computer-aided device has additional elements such as a memory interface. Alternatively or additionally, the term refers to a device that can preferably use a standardized programming language (such as C++, JavaScript or Python) to execute a provided or packaged program, and / or control and / or access data storage devices and / or other devices (such as input interfaces and output interfaces). The term "computer-aided device" also refers to multiple processors or multiple (sub) computers that are connected to each other and / or otherwise communicatively connected and may share one or more other resources (such as memories).

[0032] (Data) storage is, for example, a hard disk drive (HDD, SSD, HHD) or (non-volatile) solid-state memory, such as ROM or Flash EEPROM. The storage typically consists of multiple separate physical units or is distributed across multiple separate devices, accessed via data communication (e.g., Package Data Service). The latter is a decentralized solution in which the memory and processors of multiple independent computing units are used instead of or in addition to a (single, modular) central onboard computer.

[0033] According to another aspect, a measuring method for detecting a preload force of a door window pane of a vehicle is proposed, the measuring method comprising the following steps:

[0034] a. The measuring device according to the embodiment described above is fixed to the door window glass to be tested of the pivotable door;

[0035] b. Start recording spatial acceleration data by means of a measuring device;

[0036] c. The door window glass to be tested is associated with a pivotable door moving along the movement trajectory of the door between a closed state and an open state;

[0037] d. End of recording of spatial acceleration data by means of a measuring device;

[0038] e. With the help of the communication interface, the recorded acceleration data is output for reading.

[0039] At this point, it should be noted that in one advantageous embodiment, steps a. to d. are performed manually. In an alternative embodiment, the steps are performed by a robot or are otherwise automated. Between steps b. and d., acceleration data are detected and recorded by the measuring device or by means of its acceleration detection unit. By means of a double integral, the displacement of the door window pane is calculated from the acceleration data from the purely translational acceleration data, possibly with a previous or subsequent axis correction. In step e., the preload force is calculated from this displacement and can subsequently be read out via the communication interface. Alternatively, the raw data (i.e., for example, directly the recorded acceleration data) or the processed acceleration data (e.g., velocity data or displacement data) can be read out via the communication interface by means of an internal computing unit.

[0040] In one embodiment, the following sub-steps are performed in step e.:

[0041] e1. By means of a measuring device, the preload force of the door window glass to be tested is calculated based on the acceleration data detected along the motion trajectory of the relevant door; and

[0042] e2. Output the calculated preload force for reading via the communication interface.

[0043] According to another aspect, a computer program is provided, comprising a computer program code, wherein the computer program code can be executed on at least one computer in such a manner as to cause the at least one computer to perform a measuring method according to the embodiments described above, wherein at least one of the computers:

[0044] - included in the measuring device or its computing unit;

[0045] - contained in an external measurement unit in communication with the measurement device;

[0046] - integrated into an on-board computer of a motor vehicle; and / or

[0047] - adapted to communicate with an on-board computer of a motor vehicle.

[0048] According to another aspect, a computer program product is provided, on which a computer program code is stored, wherein the computer program code is executed on at least one computer in such a way that it causes the at least one computer to carry out a measuring method according to the embodiments described above.

[0049] wherein at least one of the computers:

[0050] - included in the measuring device or its computing unit;

[0051] - contained in an external measurement unit in communication with the measurement device;

[0052] - integrated into an on-board computer of a motor vehicle; and / or

[0053] - adapted to communicate with an on-board computer of a motor vehicle.

[0054] The computer program product with the computer program code is, for example, a medium such as RAM, ROM, SD card, memory card, flash memory card or optical disc. Alternatively, the computer program product is stored on a server and can be downloaded. Once the computer program can be read by a reading unit (e.g., a drive and / or an installation program), the computer program code contained therein and the method contained therein can be executed, for example, by a computer or by communicating with, for example, a plurality of computer-aided devices according to the above description.

[0055] Furthermore, in an advantageous embodiment of the measuring method, provision is made for a pure pivoting movement of the vehicle door with the door window to be tested to be detected beforehand, and

[0056] Therein, in step e., the pure pivoting movement of the vehicle door is subtracted from the detected movement of the door window pane in order to calculate the preload force.

[0057] In one embodiment, a further measuring device is fastened to the outside of the door window on the vehicle door, and the measured values of the second measuring device are subtracted from the measured values of the previously described measuring device on the door window or the data are superimposed on one another so that the difference in the measured values corresponds to the movement of the (first) measuring device on the door window and is presented as a result.

[0058] In the embodiment presented herein, the movement or acceleration data of the vehicle door when opening or closing the door are detected in advance, so that the door window pane does not shift into the fully closed position and, therefore, does not add to the movement of the door window pane caused by the preload force. In this context, "in advance" means that such a pivoting movement of the door has typically already been detected empirically and stored in a computing unit (e.g., in a measuring device). In an alternative embodiment, this step is performed in advance each time, for example, by slightly lowering the door window pane from the (upper) glass seal (e.g., by a short, jerky motion) and then pivoting the door, which does not take a long time. In one embodiment, the predetermined pivoting distance is necessary, for example, due to a collision with the door or to fully opening the door (up to its own hinge stop). Alternatively, only the average acceleration value is recorded and subtracted accordingly in step c. of the measurement method presented herein. Furthermore, it is known that the door window panes are also subject to a certain counterpressure due to the lateral door seals. This counterpressure influences the position of the slightly opened window pane. For this situation, it is useful to separately or in combination with the door movement data.

[0059] Furthermore, in an advantageous embodiment of the measuring method, it is provided that the starting and end points of the displacements caused solely by the preload force of the door window pane to be tested are assumed to be positions at which the door window pane experiences a certain rate of acceleration.

[0060] Preferably, a specific first acceleration change rate defines the starting point of the displacement, wherein the first acceleration change rate is caused by the following reasons:

[0061] - the start or end of the short jerking motion of the door window to be tested;

[0062] - the door to be tested has its window pane striking its associated glass seal; and / or

[0063] - the relevant door strikes its associated door seal; and / or

[0064] Preferably, a specific second acceleration rate defines the end point of the displacement, wherein the second acceleration rate is caused by triggering the start or end of a short jerking of the door window glass to be tested.

[0065] At this point it should be noted that the term "jerk" refers to the time derivative (differential) of acceleration.

[0066] This embodiment of the measuring method utilizes the fact that during a door movement, or during an (automated) movement of the door window, a specific acceleration rate occurs, which is characterized by being detectable by an acceleration detection unit or calculation unit (preferably within the measuring device). For example, the acceleration rate is the beginning or end of a short jerky motion, during which the door window tilts from its fully closed position (typically a position loaded toward the outside of the door) to a more relaxed (preloaded) position (typically toward the inside of the door). For example, the end of this tilting motion is associated with a specific second acceleration rate, because the door window is subsequently stopped by another element (e.g., a window seal on the door side transverse to the tilting motion of the door window) or by a counter-support in the door, located outside the door window (related to the inherent stress of the door window).

[0067] Alternatively, in a measurement method performed when the door is closed rather than opened, the impact with the door window pane and / or the vehicle door is a specific first acceleration rate relative to the start of a displacement of the door window pane (characteristic of the preload force of the door window pane). In the case of the impact with the door window pane, the door window pane contacts a window seal oriented approximately vertically relative to the vehicle. In one advantageous embodiment, the second acceleration rate, which defines the end point of the displacement and characterizes the preload force of the door window pane, is triggered by the beginning or end of a short jerk. For example, the impact with the door or the door window pane occurs when the door is closed and the short jerk is subsequently performed, wherein the displacement traversed by the door window pane during the short jerk then corresponds to the preload force of the door window pane.

[0068] Another specific acceleration rate is, for example, a rotational movement about a pivot axis of a vehicle door, which is oriented, for example, vertically relative to the vehicle or parallel to the Earth's gravitational field. The start of the pivoting movement is accompanied, for example, by a relatively sudden release of a vehicle door lock.

[0069] Whether a specific jerk is determined at the beginning or at the end of the short burst depends, for example, on the inertia and / or the embodiment of the corresponding glass seal.

[0070] In an advantageous embodiment of the measuring method, provision is further made for the door window pane to be tilted about a defined tilting axis between a starting point and an end point, the starting point and the end point being solely determined by the preload force of the door window pane to be tested.

[0071] In order to calculate the preload force, only the acceleration data detected during the tilting movement about the tilt axis of the door window pane are taken into account.

[0072] Preferably, the acceleration detection unit includes a gyroscope, by means of which a rotational acceleration about a rotation axis parallel to the tilt axis can be detected.

[0073] In this embodiment of the measuring method, the tilting movement of the door window pane is taken into account, and only the rotational acceleration, or more precisely the rotational movement, geometrically caused by this tilting movement is considered as a displacement, which is taken into account for the preload force of the door window pane to be tested. In an alternative embodiment, only the tilting movement is recorded, and during this tilting movement, the translational movement of the door window pane is taken into account (for example, only in the direction inwardly of the door, i.e., in the y direction).

[0074] In a supplementary or alternative embodiment, a pivoting movement of the vehicle door, for example about the vehicle vertical direction (z-direction), is converted into a displacement of the vehicle door. This movement is correlated with the geometric relationship required to calculate the movement of the door window pane relative to the tilting or pivoting movement of the door window pane. Specifically, the tilting movement is known from the known geometry of the vehicle door and door window pane, and the measurement at the corresponding measuring position is reliably established by precisely positioning the measuring device on the door window pane. This can be achieved, for example, by using a corresponding hook on the holding device. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] The invention will be described in detail below, starting from the relevant technical background and referring to the accompanying drawings showing preferred designs. The invention is not limited in any way by the purely schematic drawings, which should be noted that the drawings are not accurate in size and are not suitable for defining dimensional ratios. In the drawings:

[0076] Figure 1 : A side view of a vehicle showing a measuring device fastened to a door window glass;

[0077] Figure 2 : An alternative embodiment of a measuring device fastened to a door window pane is shown in a side view of a vehicle;

[0078] Figure 3 :The rear view of the door shows the Figure 1 Measuring device fastened to the door window glass;

[0079] Figure 4 : shows an embodiment of the measurement method; and

[0080] Figure 5 : A partial view of a vehicle having frameless door window glass. DETAILED DESCRIPTION

[0081] exist Figure 1 , the measuring device 1 is shown fastened to a door window pane 2 in a side view of the vehicle so that the glass surface 15 can be seen. As shown, the door window pane 2 is received with its bottom (in the z-direction) in the vehicle door 27. In this embodiment, the measuring device 1 is positioned at the upper right end of the door window pane 2 by means of a holding device 4. The holding device 4 comprises three hooks 10, 11, 12, which are hooked onto the window edge 13 and ensure a fixed position on the door window pane 2 in the x-, y- and z-directions. In addition, a suction cup 14 is optionally provided (see Figure 2 ).

[0082] In this embodiment, the measuring device 1 includes an acceleration detection unit 5, a calculation unit 24, a communication interface 9, a screen 19, a first operating button 20, a second operating button 21, and a transmitter 22. The acceleration detection unit 5 is preferably adapted to detect acceleration data 6, 7, and 8 in all three spatial directions and / or on two or three rotation axes. In one embodiment, the detection of the acceleration data 6, 7, and 8 is started by means of the first operating button 20 and ended by means of the second operating button 21, or vice versa.

[0083] exist Figure 2 1 shows an alternative embodiment of a measuring device 1 fastened to a door window pane 2 in a side view of a vehicle, so as to Figure 1 As shown, the glass surface 15 is visible. In this alternative embodiment, the acceleration detection unit 5 is included in a mobile terminal 23, which is preferably formed separately from the holding device 4. In this embodiment, the holding device 4 includes a suction cup 14 in addition to the three hooks 10, 11, and 12, thereby ensuring that the mobile terminal 23 is fixed to the glass surface 15 in the x- and y-directions. The mobile terminal 23 is, for example, a smartphone and includes a touchscreen as the communication interface 9. The gyroscope sensor and the acceleration sensor form the acceleration detection unit 5—for example, using an app (computer program) installed on the mobile terminal 23.

[0084] exist Figure 3 The rear view of the door shows the Figure 1 A measuring device 1 is fastened to a door window pane 2 (for the sake of clarity, without excluding generality). The door window pane 2 extends in its main portion in the z- and x-directions and is slightly tilted and curved inward in the y-direction. The door window pane 2 has a glass surface 15 (here, the glass surface facing the outside of the door) and is delimited upward by a window edge 13. At its lower end in the z-direction, the door window pane 2 is held in a vehicle door 27 and can move up and down. A tilt axis 18 is formed relative to the door 27 (here, exemplarily at the door seal). When the door 27 moves from the loaded position to the preloaded position (or vice versa), the door window pane 2 performs a tilting movement 30 about this axis. This causes the measuring device 1 to move in the y-direction.

[0085] During the measurement method, a movement trajectory 26 of the door window pane 2, bounded by a starting point 16 or an end point 17, is recorded using a measuring device 1 attached to the door window pane 2. The door window pane 2, along with the measuring device 1, is shown with a solid line at the starting point 16 and with a dashed line at the end point 17. When the vehicle door 27 is opened, a short jerk 28 is executed, which pulls the door window pane 2 out of its glass seal 29. For simplification, or assuming a high inertia, the illustration shows that the door window pane 2 assumes the position indicated by the dashed line, following the direction of the short jerk 28 and not yet having moved from its loaded position. In one embodiment, the short jerk 28 can be interpreted as the starting point 16 or the end point 17 of the movement trajectory 26 and can be detected by the acceleration detection unit 5 of the measuring device 1 (e.g., in the form of acceleration data 8 representing a nearly pure translation, primarily in the z-direction), optionally evaluated, and made readable using the communication interface 9 of the measuring device 1. Alternatively or additionally, the tilting of the door window pane 2 can be detected by an acceleration detection unit 5 and, in one embodiment of the measuring method, only the translational displacement 25 in the y direction (possibly also in the z direction) is recorded during the tilting movement and / or the detected tilt is converted into a displacement 25 of the preload force with the aid of geometric relationships.

[0086] exist Figure 4One embodiment of the measurement method is shown in a flow chart. In a first step a., the measuring device 1 is attached to the door window pane 2 to be tested on a pivotable vehicle door 27. In a further step b., the recording of spatial acceleration data 6, 7, and 8 begins. In a subsequent step c., the vehicle door 27 and its associated door window pane 2 are moved along the door's motion trajectory 26 between a closed and an open state. The recording of the acceleration data 6, 7, and 8 using the measuring device 1 is then concluded in a subsequent step d. In a final step e., the acceleration data 6, 7, and 8 are output via the communication interface 9.

[0087] exist Figure 5 3 shows a vehicle 3 with a frameless door window pane 2 in a partial side view. The vehicle 3 includes wheels 31, at least one of which is adapted for travel. To allow a vehicle occupant 32 to enter the vehicle, a door 27 is provided, which can be opened by pivoting (approximately) about an A-pillar 33. The frameless door window pane 2 is received in the door 27.

[0088] With the measuring device proposed here, a simple measuring method can be carried out to test and / or adjust the preload force of a frameless door window pane of a vehicle door.

Claims

1. A measuring device (1) for detecting the preload force of a window glass (2) for a frameless door of a vehicle (3), the measuring device comprising at least the following components: - a holding device (4) for fixing the measuring device (1) on the vehicle door window pane (2) to be tested; - an acceleration detection unit (5) for recording spatial acceleration data (6, 7, 8) about the movement of the measuring device (1); and - a communication interface (9) for operating the measuring device (1) and reading acceleration data (6, 7, 8), wherein the door window pane (2) is tilted about a defined tilting axis (18) between a starting point (16) and an end point (17), the starting point and the end point being determined solely by the preload force of the door window pane (2) to be tested, The acceleration detection unit (5) includes a gyroscope, by means of which a rotational acceleration around a rotation axis parallel to the tilt axis (18) can be detected.

2. The measuring device (1) according to claim 1, wherein In order to fix the measuring device (1) on the vehicle door window pane (2) to be tested, the holding device (4) comprises: - at least one hook (10, 11, 12) for hooking onto the upper window edge (13) of the door window pane, and / or - at least one suction cup (14) for releasably adhering to the glass surface (15) of the door window pane.

3. The measuring device (1) according to claim 1, wherein The communication interface (9) comprises at least one of the following components: - screen (19); - operating buttons (20, 21); and A transmitter (22) for transmitting the acceleration data (6, 7, 8) in a machine-readable manner.

4. The measuring device (1) according to claim 1 or claim 2, wherein The holding device (4) and the acceleration detection unit (5) are formed independently of each other, wherein the acceleration detection unit (5) can be releasably fixed in the holding device (4).

5. The measuring device (1) according to claim 4, wherein The acceleration detection unit (5) is included in the mobile terminal device (23).

6. The measuring device (1) according to claim 4, wherein The acceleration detection unit (5) is included in a smartphone.

7. The measuring device (1) according to claim 1 or claim 2, wherein The invention also comprises a calculation unit (24), by means of which the recorded acceleration data (6, 7, 8) can be converted into a displacement (25) along a movement trajectory (26) of the vehicle door window glass (2) corresponding to the preload force of the vehicle door window glass (2) to be tested.

8. A method for measuring the preload force of a door window glass (2) of a vehicle (3), the method comprising the following steps: a. The measuring device (1) according to one of the preceding claims is fixed to a door window pane (2) to be tested of a pivotable door (27); b. Start recording the spatial acceleration data (6, 7, 8) by means of the measuring device (1); c. moving the pivotable door (27) associated with the door window glass to be tested (2) along the movement trajectory (26) of the door between a closed state and an open state; d. End of recording of spatial acceleration data (6, 7, 8) by means of the measuring device (1); e. With the aid of the communication interface (9), the recorded acceleration data (6, 7, 8) are output for reading.

9. The measurement method according to claim 8, wherein detecting a pure pivoting movement of the vehicle door (27) with the door window pane (2) to be tested, and Therein, in step e., in order to calculate the preload force, the pure pivoting movement of the vehicle door (27) is subtracted from the detected movement of the door window pane (2).

10. The measurement method according to claim 8 or claim 9, wherein The starting point (16) and the end point (17) of the displacement (25) caused only by the preload force of the door window glass (2) to be tested are assumed to be the positions where the door window glass (2) experiences a specific rate of acceleration.

11. The measurement method according to claim 10, wherein A specific first acceleration rate defines a starting point (16) of the displacement (25), wherein the first acceleration rate is caused by: - the beginning or end of a short jerking motion (28) of the door window pane (2) to be tested; - the door window pane (2) to be tested strikes its associated glass seal (29); and / or - the associated door (27) strikes its associated door seal; and / or A specific second acceleration rate defines the end point (17) of the displacement (25), wherein the second acceleration rate is caused by the start or end of a short jerking motion (28) that triggers the door window pane (2) to be tested.

12. The measurement method according to claim 8 or claim 9, wherein tilting the door window pane (2) about a defined tilting axis (18) between a starting point (16) and an end point (17), the starting point and the end point being derived solely from the preload force of the door window pane (2) to be tested, For calculating the preload force, only the acceleration data (7, 8) detected during a tilting movement (30) about a tilt axis (18) of the door window pane (2) are taken into account.

13. The measurement method according to claim 12, wherein The acceleration detection unit (5) includes a gyroscope, by means of which a rotational acceleration about a rotation axis parallel to the tilt axis (18) can be detected.

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