Method for operating an acceleration measuring device

Abstract

The invention relates to a method for operating an acceleration measuring device (2), wherein the acceleration measuring device (2) is provided for measuring radial accelerations of a vehicle tire (1), wherein the acceleration measuring device (2) is in particular suitable for measuring, storing, and / or evaluating a number N of acceleration measured values, said number being limited by an internal memory of the acceleration measuring device (2), over a defined number of revolutions of the vehicle tire (1).

Description

[0001] 202500576

[0002] 1

[0003] Description

[0004] Method for operating an acceleration measuring device

[0005] The invention relates to a method for operating an acceleration measuring device.

[0006] The invention relates to a method for operating an acceleration measuring device, wherein the acceleration measuring device is provided for measuring radial accelerations of a vehicle tire, wherein the acceleration measuring device is particularly suitable for measuring, storing, and / or evaluating a number N of acceleration measurements limited by an internal memory of the acceleration measuring device over a defined number of revolutions of the vehicle tire, comprising the following steps:

[0007] - Providing a vehicle tire, wherein the vehicle tire has an acceleration measuring device, the acceleration measuring device being designed to measure a radial acceleration of the vehicle tire;

[0008] -Specifying a measurement rate M;

[0009] - Measuring radial accelerations of the vehicle tire at the measurement rate M using the acceleration measuring device, wherein the radial accelerations represent a predetermined number N of revolutions of the vehicle tire, this number N covering at least half a revolution of the vehicle tire, preferably at least 1.5 revolutions of the vehicle tire, and particularly preferably at least 2.5 revolutions of the vehicle tire at the measurement rate M; - Providing an evaluation device, wherein the evaluation device is provided for evaluating the radial accelerations measured by means of the acceleration measuring device and, in particular, for evaluating a time course of the radial accelerations measured by means of the acceleration measuring device, and in particular for a202500576

[0010] 2

[0011] The device is designed to compare the temporal profile of the radial accelerations measured by means of the acceleration measuring device with a temporal reference profile of radial accelerations, and in particular to compare at least one radial acceleration measured by means of the acceleration measuring device with a reference value of a radial acceleration using the evaluation device, and in particular to compare the temporal profile of the radial accelerations measured by means of the acceleration measuring device or at least one parameter calculated from this temporal profile with a temporal reference profile or with at least one reference parameter of a temporal reference profile;

[0012] -Comparison of the temporal profile of the radial accelerations measured by the acceleration measuring device or at least one parameter calculated from this temporal profile with a temporal reference profile or with at least one reference parameter of a temporal reference profile of radial accelerations using the evaluation device.

[0013] A revolution generally refers to a complete 360° rotation of the vehicle tire around its axis of rotation.

[0014] The parameter calculated based on a time course could, for example, be a parameter that has been determined by differentiating the measured radial accelerations with respect to time.

[0015] The vehicle tire could be, for example, a car tire, a truck tire, or a two-wheeler tire.

[0016] The measurement rate M is the number of measurements per unit of time. 202500576

[0017] 3

[0018] Radial acceleration is acceleration parallel to a radius R of the vehicle tire.

[0019] The evaluation device is, for example, a device for electronic data processing, such as a computer device.

[0020] Methods for operating an acceleration measuring device are known from the prior art, wherein the acceleration measuring device is designed to measure radial accelerations of a vehicle tire, and wherein the acceleration measuring device is particularly suitable for measuring, storing, and / or evaluating a number N of acceleration measurements limited by an internal memory of the acceleration measuring device over a defined number of revolutions of the vehicle tire, comprising the following steps:

[0021] - Providing a vehicle tire, wherein the vehicle tire has an acceleration measuring device, the acceleration measuring device being designed to measure a radial acceleration of the vehicle tire;

[0022] -Specifying a measurement rate M;

[0023] - Measuring radial accelerations of the vehicle tire at the measurement rate M using the acceleration measuring device, wherein the radial accelerations represent a predetermined number N of revolutions of the vehicle tire, this number N covering at least half a revolution of the vehicle tire, preferably at least 1.5 revolutions of the vehicle tire, and particularly preferably at least 2.5 revolutions of the vehicle tire at the measurement rate M; - Providing an evaluation device, wherein the evaluation device is provided for evaluating the radial accelerations measured by means of the acceleration measuring device and, in particular, for evaluating a time course of the radial accelerations measured by means of the acceleration measuring device, and in particular for a202500576

[0024] 4

[0025] The device is designed to compare the temporal profile of the radial accelerations measured by means of the acceleration measuring device with a temporal reference profile of radial accelerations, and in particular to compare at least one radial acceleration measured by means of the acceleration measuring device with a reference value of a radial acceleration using the evaluation device, and in particular to compare the temporal profile of the radial accelerations measured by means of the acceleration measuring device or at least one parameter calculated from this temporal profile with a temporal reference profile or with at least one reference parameter of a temporal reference profile;

[0026] -Comparison of the temporal profile of the radial accelerations measured by the acceleration measuring device or at least one parameter calculated from this temporal profile with a temporal reference profile or with at least one reference parameter of a temporal reference profile of radial accelerations using the evaluation device.

[0027] The methods known from the prior art for operating an acceleration measuring device might not be optimal. For example, it might involve increased technical effort to change the measurement rate in such a way that a more accurate and reliable acceleration measurement can be achieved using the acceleration measuring device, or the measurement rate might only be suitable for a comparatively very small range of angular velocities in the case of a particular vehicle tire.

[0028] The invention is therefore based on the objective of providing an improved method for operating an acceleration measuring device. 202500576

[0029] 5

[0030] The problem set out in the invention is solved by the fact that the method for operating an acceleration measuring device comprises the following further steps:

[0031] - Determining the measurement rate M as a function of at least one determining parameter, where the at least one determining parameter represents an angular velocity W of the vehicle tire.

[0032] The measurement rate M is determined in particular by means of a suitable determination device and preferably by means of the evaluation device.

[0033] Due to the inventive circumstance, according to which the method for operating an acceleration measuring device comprises the following further steps:

[0034] - Determining the measurement rate M as a function of at least one determining parameter, where the at least one determining parameter represents an angular velocity W of the vehicle tire,

[0035] The number N of radial accelerations recorded during a measurement can cover a predetermined number of wheel rotations, and thus be detected by sensors. Therefore, the measurement rate can be suitable for a wider range of angular velocities of wheel rotations compared to the current state of the art.

[0036] This provides an improved method for operating an acceleration measuring device.

[0037] Further advantageous embodiments of the present invention are the subject of the dependent claims.

[0038] According to a preferred embodiment of the present invention, the measurement rate M is determined by means of, i.e., as a function of, a measured radial acceleration A at a time T and a radius R of the202500576

[0039] 6

[0040] vehicle tire, wherein the acceleration measuring device at time T and thus the radial acceleration A measured at this time T are located outside a ground contact area of ​​the vehicle tire.

[0041] Due to the inventive circumstance whereby the measurement rate M is determined by means of a radial acceleration A measured at time T and a radius R of the vehicle tire, wherein the acceleration measuring device at time T and thus the radial acceleration A measured at this time T are located outside a ground contact area of ​​the vehicle tire, the angular velocity W of the tire can be determined by means of a simple measurement of a radial acceleration and the tire radius according to the relationship: W = (A / R) 1 / 2 . This eliminates the need for a direct measurement of angular velocity, which would have to be carried out over a comparatively longer period of time.

[0042] According to a further preferred embodiment of the present invention, the radius R is determined in an initialization step by means of the acceleration measuring device by means of, i.e., depending on, a radial acceleration A measured outside the ground contact area of ​​the vehicle tire in an initial measurement and by means of, i.e., depending on, a measured angular velocity W, wherein the radius R is calculated as R = A / W 2 , wherein the angular velocity W is determined by means of the radial accelerations recorded during the N initialization step over the time between two passes of the vehicle tire through the ground contact area, wherein a measurement rate is specified in this initialization step.

[0043] According to the invention, the radius R is determined in an initialization step by means of the acceleration measuring device using a radial acceleration A measured outside the ground contact area of ​​the vehicle tire in an initial measurement and using a measured angular velocity W, wherein the radius R is calculated as 202500576

[0044] 7

[0045] R = A / W 2The angular velocity W is determined by measuring the radial accelerations recorded during the initialization step (N) over the time between two passes of the vehicle tire across the contact patch. In this initialization step, a measurement rate suitable for a number of vehicle tires is specified. Therefore, the acceleration measurement device can be used without a predefined tire radius R. This simplifies the installation of a standardized acceleration measurement device in vehicle tires of varying sizes. For example, this eliminates the need for complex logistics to insert acceleration measurement devices only into tires with a specific radius R, or the additional configuration step of storing a radius in the device's internal memory.

[0046] According to a further preferred embodiment of the present invention, the initialization step is repeated if the initial measurement fails to meet at least one quality criterion. This at least one quality criterion is, for example, that the two measured passes through the ground contact area necessary for determining the angular velocity W are checked for similarity to each other. This check means that at least one quality criterion must be met. This check of similarity is, for example, a quantitative, or geometric, check of the similarity of the two measured passes through the ground contact area. The check of similarity is carried out, in particular, by means of the evaluation device.The initial measurement can also be a repeated measurement: Thus, if the quality criterion is not met after the initial measurement, a new initial measurement can be carried out, after which it can be checked again whether the quality criterion is met. Depending on this check of whether the quality criterion is met, an unlimited number of new initial measurements can be carried out, each followed by a check to see if the 202500576.

[0047] 8

[0048] The process will continue until the quality criterion is finally met.

[0049] Due to the inventive circumstance whereby the initialization step is repeated if the initial measurement does not meet at least one quality criterion, wherein the at least one quality criterion is, for example, that the two measured passes through the ground contact area necessary for determining the angular velocity W are checked for their similarity, the determination of the radius R can be improved and the radius R is not determined based on a potentially faulty measurement.

[0050] According to a further preferred embodiment of the present invention, the predetermined measurement rate M is changed when the initialization step is repeated. The change in the measurement rate M is effected, for example, by means of the acceleration measuring device and, in particular, by means of a control element of the acceleration measuring device.

[0051] The inventive feature, whereby the predetermined measurement rate M is changed when the initialization step is repeated, allows the determination of the radius to be improved, because if the measurement rate M is not meaningfully predetermined, for example the N acceleration values ​​do not extend over two passes through the ground contact area.

[0052] According to a further preferred embodiment of the present invention, instead of repeating the initialization step, a default value of the radius R is assumed, wherein this default value can be selected from a number of default values, which are stored in particular in the internal memory of the accelerometer, wherein this number is at least 1 and preferably not more than 8, particularly preferably not more than 4.

[0053] 9

[0054] The inventive feature, whereby instead of repeating the initialization step a default value of the radius R is assumed, wherein this default value can be selected from a number of default values, where this number is at least 1 and preferably not more than 8, particularly preferably not more than 4, particularly avoids the situation where a radius is not continuously attempted to be determined if at least one quality criterion is not met. According to this embodiment, a certain number of repetitions can take place before the default value is assumed.

[0055] If the number of default values ​​stored in the accelerometer's internal memory is greater than 1, the default value to be used for the vehicle tire can be selected via a configuration variable. Because only a few default values ​​are stored, each default value can be used to describe a large number of vehicle tires. This eliminates, for example, the need for complex logistics to ensure that accelerometers are only installed in vehicle tires of a specific radius R.

[0056] Further advantages, features and details, to which the scope of the invention is not limited, will now be described in more detail with reference to the drawings.

[0057] It shows:

[0058] Fig. 1: A schematic representation of an acceleration measuring device and a vehicle tire;

[0059] Fig. 2: A schematic representation of the method according to the invention.

[0060] Figure 1 shows a schematic radial section view of a vehicle tire 1. The vehicle tire 1 is rotatable about an axis of rotation 3 in a direction of rotation 4. The vehicle tire 1 has an acceleration measuring device 2, wherein the 202500576

[0061] 10

[0062] The acceleration measuring device 2 is provided for measuring the radial acceleration of the vehicle tire 1.

[0063] By means of an evaluation device 5, the evaluation of the radial accelerations measured by means of the acceleration measuring device 2 and in particular the evaluation of a temporal profile of the radial accelerations measured by means of the acceleration measuring device 2 can be carried out and in particular a comparison of the temporal profile of the radial accelerations measured by means of the acceleration measuring device 2 with a temporal reference profile of radial accelerations can be carried out.

[0064] Also shown is a radius 6 of the vehicle tire 1.

[0065] Figure 2 schematically illustrates a method according to the invention for operating an acceleration measuring device 2, wherein the acceleration measuring device 2 is provided for measuring radial accelerations of a vehicle tire 1, wherein the acceleration measuring device 2 is particularly suitable for measuring, storing and / or evaluating a number N of acceleration measurements limited by an internal memory of the acceleration measuring device 2 over a defined number of revolutions of the vehicle tire 1.

[0066] Step A starts the process.

[0067] In step B, a vehicle tire 1 is provided, wherein the vehicle tire 1 has an acceleration measuring device 2, wherein the acceleration measuring device 2 is provided for measuring a radial acceleration of the vehicle tire 1.

[0068] In step C, a measurement rate M is specified.

[0069] In step D, radial accelerations of the vehicle tire 1 are measured at the measurement rate M using the acceleration measuring device 2, wherein the radial accelerations correspond to a predetermined number N of revolutions of the 202500576

[0070] 11

[0071] vehicle tire 1 represents, wherein this number N covers at least half a revolution of the vehicle tire 1, preferably at least 1.5 revolutions of the vehicle tire 1 and particularly preferably at least 2.5 revolutions of the vehicle tire 1 at the measurement rate M.

[0072] In step E, an evaluation device 5 is provided, wherein the evaluation device 5 is provided for evaluating the radial accelerations measured by means of the acceleration measuring device 2 and in particular for evaluating a temporal profile of the radial accelerations measured by means of the acceleration measuring device 2 and in particular for comparing the temporal profile of the radial accelerations measured by means of the acceleration measuring device 2 with a temporal reference profile of radial accelerations and in particular for comparing at least one radial acceleration measured by means of the acceleration measuring device 2 with a reference value of a radial acceleration by means of the evaluation device 5.

[0073] In step F, the temporal profile of the radial accelerations measured by means of the acceleration measuring device 2, or at least one parameter calculated from this temporal profile, is compared with a temporal reference profile or with at least one reference parameter of a temporal reference profile of radial accelerations using the evaluation device 5.

[0074] In step G, the measurement rate M is determined as a function of at least one determining parameter, where the at least one determining parameter represents an angular velocity W of the vehicle tire 1.

[0075] Step H completes the process. 202500576

[0076] 12

[0077] Reference symbol list

[0078] 1 vehicle tire

[0079] 2 Acceleration measuring device 3 Rotation axis

[0080] 4 Direction of rotation

[0081] 5 Evaluation device

[0082] 6 Radius of the vehicle tire

Claims

202500576 13 Patent claims 1. Method for operating an acceleration measuring device (2), wherein the acceleration measuring device (2) is designed for measuring radial accelerations of a vehicle tire (1), wherein the acceleration measuring device (2) is particularly suitable for measuring, storing, and / or evaluating a number N of acceleration measurements limited by an internal memory of the acceleration measuring device (2) over a defined number of revolutions of the vehicle tire (1), comprising the following steps: - Providing a vehicle tire (1) wherein the vehicle tire (1) has an acceleration measuring device (2) wherein the acceleration measuring device (2) is provided for measuring a radial acceleration of the vehicle tire (1); - Specifying a measurement rate M; - Measuring radial accelerations of the vehicle tire (1) at the measurement rate M using the acceleration measuring device (2), wherein the radial accelerations represent a predetermined number N of revolutions of the vehicle tire (1), wherein this number N covers at least half a revolution of the vehicle tire (1) at the measurement rate M, preferably at least 1.5 revolutions of the vehicle tire (1) and particularly preferably at least 2.5 revolutions of the vehicle tire (1); - Providing an evaluation device (5), wherein the evaluation device (5) is provided for evaluating the radial accelerations measured by means of the acceleration measuring device (2) and in particular for evaluating a temporal profile of the radial accelerations measured by means of the acceleration measuring device (2) and in particular for comparing the temporal profile of the radial accelerations measured by means of the acceleration measuring device (2) with a temporal reference profile of radial accelerations and in particular for a202500576 14 The device is designed to compare at least one radial acceleration measured by means of the acceleration measuring device (2) with a reference value of a radial acceleration using the evaluation device (5) and in particular to compare the temporal profile of the radial accelerations measured by means of the acceleration measuring device or at least one parameter calculated from this temporal profile with a temporal reference profile or with at least one reference parameter of a temporal reference profile of radial accelerations; -Comparison of the time course of the radial accelerations measured by the acceleration measuring device or at least one parameter calculated from this time course with a time reference course or with at least one reference parameter of a time reference course of radial accelerations using the evaluation device (5); Characterized by the next step: - Determination of the measurement rate M as a function of at least one determination parameter, wherein the at least one determination parameter represents an angular velocity W of the vehicle tire (1).

2. Method according to claim 1, characterized in that the measurement rate M is determined by means of a radial acceleration A measured at a time T and a radius R (6) of the vehicle tire (1), wherein the radial acceleration A measured at a time T is located outside a ground contact area of ​​the vehicle tire (1).

3. Method according to one of the preceding claims, characterized in that the radius R (6) is determined in an initialization step by means of the acceleration measuring device (2) by means of an initial measurement outside the ground contact area of ​​the vehicle tire (1). 15 measured radial acceleration A and by means of a measured angular velocity W, where the radius R (6) is calculated as R = A / W 2 , wherein the angular velocity W is determined by means of the radial accelerations recorded during the N in the initialization step over the time between two passes of the vehicle tire (1) through the ground contact area, wherein a measurement rate is specified in this initialization step.

4. Method according to the preceding claim, characterized in that the initialization step is repeated if the initial measurement does not meet at least one quality criterion, wherein the at least one quality criterion is, for example, that the two measured passes through the ground contact area necessary for determining the angular velocity W are checked for similarity.

5. Method according to the preceding claim, characterized in that the predetermined measurement rate M is changed when the initialization step is repeated.

6. Method according to one of claims 3 or 4, characterized in that instead of repeating the initialization step, a standard value of the radius R (6) is assumed, wherein this standard value can be selected from a number of standard values, which are stored in particular in the internal memory of the acceleration measuring device (2), wherein this number is at least 1 and preferably not more than 8, particularly preferably not more than 4.

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