阅读说明：本技术 用于确定车辆轮胎的轮胎状态的系统 (System for determining the state of a vehicle tyre ) 是由 L·罗特坎普 于 2019-11-26 设计创作，主要内容包括：本发明涉及一种用于确定车辆中的车辆轮胎(1)的轮胎状态的系统,所述系统具有：一定数量的传感器(11),所述传感器获取与轮胎状态相关的测量值(m-(1)、m-(2)、m-(3))；用于数据记录和数据传输的装置(5),该装置在输入侧与传感器(11)以传递信号的方式连接。根据本发明,所述装置(5)的信号输出端与读取单元(13)以传递信号的方式连接(8),优选无线连接,所述装置(1)基于所获取的测量值(m-(1)、m-(2)、m-(3))生成实际轮胎参数并且将所述实际轮胎参数传输至读取单元(13)。(The invention relates to a system for determining a tire condition of a vehicle tire (1) in a vehicle, having: a number of sensors (11) for obtaining measurements (m) related to the condition of the tyre 1 、m 2 、m 3 ) (ii) a A device (5) for data recording and data transmission is connected on the input side to a sensor (11) in a signal-transmitting manner. According to the invention, the signal output of the device (5) is connected (8), preferably wirelessly, to a reading unit (13) in a signal-transmitting manner, and the device (1) is based on the acquired measured values (m) 1 、m 2 、m 3 ) Generating actual tire parameters and referencing the actual tire parametersThe number is transmitted to a reading unit (13).)

1. For determining a vehicleA system of the tyre condition of a vehicle tyre (1), said system having: a number of sensors (11) for obtaining measurements (m) related to the condition of the tyre₁、m₂、m₃) (ii) a Device (5) for data recording and data transmission, which is connected on the input side to a sensor (11) in a signal-transmitting manner, characterized in that a signal output of the device (5) is connected (8), preferably wirelessly, to a read unit (13) in a signal-transmitting manner, and the device (1) is based on the measured values (m) obtained₁、m₂、m₃) Actual tire parameters are generated and transmitted to a reading unit (13).

2. The system according to claim 1, characterized in that, by means of the sensor (11), the device (5) acquires the current values of at least a part of, in particular all, the following measurement values continuously, periodically, upon interrogation or otherwise:

steering angle of the wheels

Temperature of the outside air, temperature of the tire gases and/or temperature of the tread

Absolute or relative tire pressure

Air pressure and/or air humidity outside the tyre

Moisture value outside the tyre, obtained for example by measuring the conductivity of the tread

The rotational speed of the wheel about a transverse axis, i.e. the number of revolutions of the wheel per unit time

Rotational speed of the wheel about a vertical axis, i.e. steering movement

Acceleration of the wheels in the lateral direction of the vehicle during cornering and/or side-slip

Acceleration of the wheel in the longitudinal direction of the vehicle when the vehicle is accelerating or braking

Acceleration of the wheel in the height direction upon spring-in or spring-out of the wheel.

3. System according to claim 1 or 2, characterized in that said device (5) is provided with a meterA computing unit (9) by means of which the measured values (m) that can be obtained by the sensors can be determined₁、m₂、m₃) Deriving a relevant tire condition variable (z)₁、z₂、z₃) In particular, at least some, in particular all, of the following tire state variables are determined by means of the computing unit (9):

degree of ageing of the tyre

Total running time of the tire

Storage time and storage temperature

History of tire usage profiles, i.e. history of tires including storage periods

Up to the current number of tyre revolutions

Maximum value of the measured value

Minimum value of the measured value

-the mean value of the measured values or a distribution thereof;

in particular, not only the tire state variable (z)₁、z₂、z₃) And using measured values (m) obtained by the sensors₁、m₂、m₃) Constitute the actual tire parameters.

4. A system according to claim 1, 2 or 3, characterized in that said device (5) is provided with a data memory (7) in which the actual tyre parameters (m) can be read and stored₁、m₂、m₃、z₁、z₂、z₃) In particular, the data memory (7) is connected (8) to a reading unit (13) on the output side in a signal-transmitting manner, preferably wirelessly, in order to read the stored actual tire parameters into the reading unit (13).

5. The system according to any one of the preceding claims, characterized in that the device (5) is provided with an evaluation unit (15), by means of which the tire condition can be determined by a suitable method, in particular by means of which the evaluation unit (15) can determine whether the tire (1) is capable of running or incapable of running, or is suitable for retreading.

6. System according to claim 5, characterized in that in said evaluation unit (15) a theoretical value actual value comparison is made, in which comparison at least one actual tyre parameter is compared with a corresponding theoretical value (SW) from, for example, a permissible tyre specification (10).

7. The system according to claim 5 or 6, characterized in that the evaluation unit (15) is a tire wear model unit, by means of which the current tread depth (t) of the tire (1) can be determined on the basis of the actual tire parameters, in particular without the provision of tread depth sensors.

8. System according to any one of the preceding claims, characterized in that said device (5) is mounted permanently, semi-permanently or temporarily, for example by means of an adhesive method, on the tyre (1) or on the rim (3) of the wheel, and/or in that said device (5) can be supplied with electrical energy by a battery or accumulator, and/or by a device for obtaining energy located on the wheel, and/or by a device on the vehicle, and/or by other devices, for example in a contactless inductive transmission.

9. The system according to any one of the preceding claims, characterized in that the computing unit (9), the evaluation unit (15) and the data memory (7) are integrated as program modules in the device (5).

10. The system according to any one of the preceding claims, characterized in that the reading unit (13) is a workshop-side reading device and/or is a vehicle-side receiving means, for example, which has, in particular, a display or a voice output for a vehicle user and/or is a reading device for a person outside the vehicle, in particular in fleet management; the display can be actuated in particular directly by the reading unit (13) or by means of an interposed unit, for example a control device provided for user input and/or output.

Technical Field

The present invention relates to a system for determining the tyre condition of vehicle tyres in a vehicle according to the preamble of claim 1.

Background

The state of vehicle tires is currently often checked manually, for example visually by means of corresponding measuring tools in terms of ageing, damage and tread depth measurement. Indirect estimation methods are also known in some vehicles, which automatically detect air losses or determine tire parameters by means of tire pressure sensors. Such manual monitoring of vehicle tires is inconvenient. Furthermore, tire monitoring is often forgotten. Furthermore, many tire parameters are not obtained, such as the maximum temperature to which the tire is subjected.

A system of the present type for determining the tire condition of a vehicle tire has a plurality of sensors that acquire measurements related to the tire condition. The system also has a device for data recording and data transmission, which is connected on the input side to the sensor in a signal-transmitting manner.

WO 2018/095615 a discloses a vehicle tyre with an integrated conductor track. EP 3287304 a1 discloses a pneumatic vehicle tire and an electronic configuration method for the pneumatic vehicle tire. DE 102009008350B 4 discloses a tire monitoring device. DE 102008014547 a1 discloses a tire condition monitoring device.

Disclosure of Invention

The object of the present invention is to provide a system for determining the tire condition of a vehicle tire, in which the current tire condition can be estimated or determined in a structurally simple and operationally reliable manner.

This object is achieved by the features of claim 1. Preferred developments of the invention are disclosed in the dependent claims.

According to the characterizing part of claim 1, the device connected to the sensor in a signal-technical manner is connected with its signal output to the reading unit in a signal-transmitting manner, preferably wirelessly. The device is capable of generating actual tyre parameters based on measurements obtained with sensor technology and conveying them to a reading unit.

The device for data recording and data transmission can be attached to the tire or rim of a vehicle wheel. The device may be permanently installed (e.g. already built into the rubber at the time of tyre manufacture) or semi-permanently or temporarily installed, e.g. by a suitable adhesive method.

By means of the invention, an accurate knowledge about the life of the tire is obtained. This allows a safety benefit to be realized. In addition, the invention can make a decision on the basis of the customization of the tire, thereby saving the running cost. This is particularly important for special tires, which are relatively expensive (for example in the field of mining, agriculture or racing).

In one technical embodiment, the supply voltage required for the operation of the device can be provided by a battery or an accumulator, and/or by a device located on the wheel for extracting energy (for example mechanically by rotation or acceleration changes of the wheel or by temperature gradients), and/or by a device on the vehicle (for example contactless inductive transmission), and/or by other devices.

By means of a (e.g. commercial) sensor, the device can continuously, periodically, upon interrogation or in some other way acquire the current values of at least some of the following measurement variables, in particular the current values of all of the following measurement variables:

steering angle of the wheels

Temperature of the outside air, temperature of the tire gases and/or temperature of the tread

Absolute or relative tire pressure

Air pressure and/or air humidity outside the tyre

Moisture value outside the tyre (e.g. measuring the conductivity of the tread)

Rotational speed of the wheel about a horizontal axis (i.e. the number of revolutions of the wheel per unit time)

Rotational speed of the wheel about the vertical axis (steering movement)

Acceleration of the wheel in the transverse direction (cornering, side slip)

Acceleration of the wheel in the longitudinal direction (vehicle acceleration or braking)

Acceleration of the wheel in the height direction (bouncing of the wheel)

These measured values acquired by the sensors can be stored in a memory unit integrated in the device or connected to the device. Alternatively or additionally, these measured values can be transmitted continuously, periodically, upon inquiry or in some other way via a transmission unit integrated in or connected to the device to a vehicle-side receiving component, to other devices (for example a smartphone or a reader in a workshop) and/or via the internet to a server. The transmission is advantageously carried out wirelessly, for example by near field communication (RFID), Bluetooth, W-Lan or a mobile communication network.

At least some of the following tire state variables (in particular all tire state variables) which can likewise be transmitted in this way are additionally stored in the device:

degree of ageing of the tyre

Total running time of the tire

Storage time and storage temperature

History of usage profiles (e.g. tyre "history" including storage period)

Up to the current number of tyre revolutions

Maximum value of the measured value

Minimum value of the measured value

Mean values of measured values or their distribution (e.g. histogram)

Alternatively, these values may be calculated on the associated device (e.g. by an on-board computer of the vehicle) from the measured values.

The information about the tire condition, in particular about whether the tire is still capable of running or has to be replaced, can likewise be calculated by evaluation software in the device or outside the device in a suitable manner, for example in comparison with the permissible operating specifications of the tire and/or in comparison with a typical model of a flawless or non-flawless tire. It can also be calculated whether the tire is still suitable for retreading. The current tread depth can be estimated in particular by suitable methods (for example by means of a tire wear model).

Such information may be transmitted to the vehicle driver and/or other persons outside the vehicle (e.g., in fleet management), for example, via a vehicle display or through a voice output device. In particular, a warning can be issued when the tire is worn. The warning can also be reported automatically to a center, for example a server for fleet management, by means of a suitable transmission device, so that, for example, a maintenance date can be established for the vehicle.

Depending on the functional range, the device can be designed in different ranges. In the simplest form only simple values, for example temperature, are measured and read by near field communication (RFID). The required energy is advantageously also provided by near field communication, so that no current supply of the device itself is required. In this context, the device resembles a patch or a chiplet.

In the case of a very large functional range, the device is designed as a "mini-PC" and is equipped, for example, with a modern operating system. Here, a suitable housing and, if necessary, a cooling device are required.

One aspect of the invention is described in detail below: the reading unit can thus be a reading device on the vehicle floor side, a receiving means for the vehicle user on the vehicle side (i.e. a vehicle display or a speech output device on the vehicle side). Alternatively, the reading unit can also be a reading device for persons outside the vehicle.

In a technical embodiment, the device can be provided with a data memory in which the actual tire parameters can be read and stored. The data memory can be connected on the output side, preferably wirelessly, with a reading unit in a signal-transmitting manner in order to read the actual tire parameters stored in the data memory into the reading unit.

In terms of estimating the current tire condition as accurately as possible, it is preferable to equip the device with a computing unit. The tire state variable associated therewith can be derived by the computing unit from the measured values acquired by the sensors. Preferably, according to the invention, the actual tire parameters are understood to encompass both the tire state variables and the measured values obtained with the sensors.

In a further development of the invention, the device can be equipped with an evaluation unit. The current tire state can be determined or estimated by means of the evaluation unit by suitable methods. In a particular embodiment variant, a theoretical value actual value comparison can be carried out in the evaluation unit, wherein at least one actual tire parameter is compared with a corresponding theoretical value, for example from an approved tire specification. The theoretical values of the allowable tire specifications may be stored in the evaluation unit.

By means of the evaluation unit, it can preferably be determined that: the tire is capable of running or incapable of running, or suitable for retreading.

Alternatively and/or additionally, the evaluation unit may be a tire wear model unit. The current tread depth of the tire can thereby be determined on the basis of the actual tire parameters, in particular without the provision of a tread depth sensor.

Preferably, the device is permanently, semi-permanently or temporarily mounted on the tyre or rim of the wheel by means of, for example, adhesive bonding.

Drawings

Embodiments of the invention are described below with the aid of the figures.

In the drawings:

FIG. 1 is an enlarged cross-sectional view of a vehicle tire with the device installed;

FIG. 2 is a block diagram of a system for determining a tire condition according to a first embodiment;

fig. 3 and 4 are views corresponding to fig. 2 according to the second and third embodiments, respectively.

Detailed Description

Fig. 1 shows a wheel with a tire 1 in an enlarged cross-sectional view, which is inserted into a rim 3. The tire 1 has a tread pattern with a tread depth t on its radially outer portion. The device 5 is bonded to the sidewall of the tyre 1. The device 5 is a component of a system for determining the tyre condition of a vehicle tyre as described with reference to fig. 2. In this system, data transmission and data recording are performed in the device 5.

A system for determining the condition of a tire is described below with reference to the block diagram shown in fig. 2. The block diagrams are presented to facilitate an understanding of the present invention. Thus, fig. 2 is merely a rough, simplified diagram that does not reflect the real software architecture of the system. In fig. 2, the device 5 therefore has a data memory 7 as program module and a computing unit 9. In fig. 2, device 5 is connected on the input side to a plurality of sensors 11 in a signal-transmitting manner, which acquire measured values m relating to the tire condition₁、m₂、m₃. These measured values m₁、m₂、m₃Is read into the data memory 7 and stored therein. The computing unit 9 derives the measured value m obtained by using the sensor₁、m₂、m₃Deriving a tyre condition variable z₁、z₂、z₃These tire state variables and the corresponding measured values m₁、m₂、m₃And (4) associating. Calculated tire condition parameter z₁、z₂、z₃And a measured value m obtained by the sensor₁、m₂、m₃Constitutes an actual tire parameter in the sense of the present invention, on the basis of which the current tire condition can be determined.

Tire state variable z determined in computing unit 9₁、z₂、z₃And a measured value m obtained by the sensor₁、m₂、m₃In fig. 2, are stored in the data memory 7 and read out therefrom, if necessary, into the read unit 13. The reading unit 13 is connected 8 in fig. 1 wirelessly to the signal output of the data memory 7 in a signal-transmitting manner, for example by near field communication (RFID), bluetooth, W-LAN or by a mobile communication network. Preferably, the reading unit 13 can be a reading device on the vehicle shop side or a receiving component on the vehicle side, such as a vehicle display or a voice output device on the vehicle side. Alternatively, the reading device can also be arranged outside the vehicle in terms of fleet management at a central dispatch station of fleet management.

Fig. 3 shows a system for determining the tire condition of a vehicle tire according to a second exemplary embodiment, the basic structure and the functional manner of which correspond to the first exemplary embodiment shown in fig. 1 and 2. In addition to (an aspect of) the first exemplary embodiment, the device 5 also has an evaluation unit 15, by means of which the tire state can be determined. In fig. 3, this is done, for example, by means of a comparison of the setpoint values and the actual values, wherein at least one actual tire parameter m is read from the data memory 7_x，z_xAnd is compared with the corresponding theoretical value SW of the permitted tyre specification 10 stored in the device 5. With the aid of this comparison, the evaluation unit 15 determines whether the tire is capable of running or incapable of running, or is suitable for retreading. The tire state determined in the evaluation unit 15 is transmitted as a corresponding signal to the reading unit 13 via the wireless signal-transmitting connection 8.

Instead of this, a third embodiment is shown in fig. 4. According to this embodiment, a tire wear model is stored in the evaluation unit 15. Based on the actual tire parameters m read from the data memory 7 by means of the tire wear model stored in the evaluation unit 15_x、z_xThe current tread depth t of the tyre 1 is determined, in particular without the need to provide a specific tread depth sensor. The current tread depth t determined in the evaluation unit 15 is transmitted as a corresponding signal via the wireless connection 8 to the reading unit 13.

List of reference numerals:

1 tire

3 wheel rim

5 device

7 data memory

9 calculation unit

10 tyre running specification

11 sensor

13 read unit

15 evaluation unit

Depth of t-pattern

Theoretical value of SW