KR101790851B1 - Apparatus for measuring deformation of tire - Google Patents

Abstract

The present invention relates to a tire deformation amount measuring apparatus comprising a deformation amount measuring section for measuring a deformation amount of a tire having a plurality of deformation amount measuring sensors provided on a tire and a deformation amount calculating section for receiving the deformation amount measuring data from the deformation amount measuring section, Wherein the deformation amount measuring unit comprises at least three deformation amount measuring sensors for the direction of deformation of the deformation amount measuring sensor, the deformation amount measuring sensor being disposed in a direction parallel to the running direction of the tire, and a deformation amount measuring sensor Wherein the deformation amount calculating unit calculates the deformation amount measuring position and the rotating direction using the data obtained from the running direction deformation amount measuring sensor and the lateral deformation amount measuring sensor, Construct to calculate the deformation from the part Relates to a tire strain measuring device, characterized in that the tire deformation measuring device in accordance with the present invention it is possible to detect the amount of deformation of the tire to accurately predict the sensor measurement position and direction of rotation.

Description

[0001] APPARATUS FOR MEASURING DEFORMATION OF TIRE [0002]

The present invention relates to a tire deformation measuring apparatus, and more particularly, to a tire deformation measuring apparatus comprising a tire deformation detecting apparatus comprising a tire deformation measuring sensor and a lateral deformation measuring sensor, To a deformation measuring apparatus.

It is necessary to accurately measure the behavior of the tire by measuring the amount of deformation by measurement of the tire because the deformation amount distribution of the circumference of the tread portion of the tire mounted on the running vehicle has a very important influence on the tire performance.

In this connection, there have been proposed a number of techniques for evaluating the behavior of a tire, abnormal wear, road surface condition, and grounding length by attaching a sensor in the tread of the tire. However, since the data is collected from a part of the rotating tire, there is a limit to the evaluation of the part where the sensor is not located near the ground or the ground. That is, the sensor signal which can give only one information per rotation has a limitation in that the information of the control device is insufficient for the vehicle having a rapid change in the emergency.

 In order to overcome this limitation, a method of attaching a plurality of sensors in the direction of rotation of the tire has been attempted. However, as the number of sensors linearly increases, the number of channels increases and additional hardware is required. There is a problem that the cost is increased.

Also, even if a plurality of sensors are applied to one channel and an evaluation system is constructed, there is a limitation that the tire can not know the position of the sensor because it continues to rotate during operation.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems of the prior art, and it is an object of the present invention to provide a method and apparatus for detecting a deformation amount of a tire And to provide a deformation measuring device for a tire.

It is another object of the present invention to provide a tire deformation measuring apparatus capable of drastically reducing a calculation amount and a data storage amount by analyzing deformation amount measurement data signals of a plurality of sensors installed on a tire using one receiver of a deformation amount calculating unit.

According to an aspect of the present invention,

1. A tire deformation amount measuring device comprising a deformation amount measuring portion for measuring a deformation amount of a tire having a plurality of deformation amount measuring sensors provided on a tire and a deformation amount calculating portion for calculating a deformation amount of the tire by receiving deformation amount measuring data from the deformation amount measuring portion, The deformation amount measuring unit may include three or more running direction deformation amount measuring sensors provided in the longitudinal direction of the deformation amount measuring sensor in a direction parallel to the running direction of the tire and at least one lateral direction deformation amount measuring sensor disposed in the longitudinal direction of the deformation amount measuring sensor, Wherein the deformation amount calculating unit calculates a deformation amount measuring position and a rotating direction using data obtained from the running direction deformation amount measuring sensor and the lateral deformation amount measuring sensor, Which is configured to calculate the strain It relates to a tire strain measuring device according to claim.

The deformation amount measuring unit may include a deformation amount measuring sensor including a strain gage and a Wheatstone bridge circuit. A signal processing unit for processing the data measured by the deformation amount measuring sensor to generate a pulse signal; A transmission unit for transmitting the deformation amount measurement data processed by the signal processing unit to the reception unit of the deformation amount calculation unit by wire or wirelessly; And a power supply unit for supplying power to the deformation amount measuring sensor.

Wherein the deformation amount calculation unit comprises: a receiving unit for receiving deformation amount measurement data from the transmission unit of the deformation amount measurement unit; A control unit for calculating a deformation amount of the tire using the deformation amount measurement data received through the receiving unit; And a data storage unit for storing strain data calculated by the control unit. And a display unit for displaying the deformation amount data.

In the tire deformation measuring apparatus according to an embodiment of the present invention, the plurality of deformation measuring sensors may be connected to one channel.

In the tire deformation measuring apparatus according to an embodiment of the present invention, the plurality of deformation measuring sensors may be arranged in four to eight equally spaced along the circumferential direction of the tire. In the tire deformation measuring apparatus according to an embodiment of the present invention, the deformation amount measuring unit may be configured to measure an electromotive force due to a resistance change using a Wheatstone bridge.

The tire deformation measuring apparatus of the present invention can measure a deformation amount of a tire more accurately by using a plurality of sensors in one channel and estimating a measurement position and a rotating direction of a deformation amount measuring sensor in a tire, More information is provided to enable more precise control.

According to the tire deformation measuring apparatus of another embodiment of the present invention, when a plurality of transmitting units (transmitters) attached to a tire are used, analysis through one channel is possible and specific data of a plurality of deformation measuring sensors are integrated into one signal Therefore, it is possible to remarkably reduce the amount of data stored and exclude unmeasured areas of interest, thereby measuring and monitoring the amount of deformation of the tire more efficiently.

1 is a schematic block diagram of a tire deformation measuring apparatus according to an embodiment of the present invention.
2 is a view for explaining the operation principle of a tire deformation measuring apparatus according to an embodiment of the present invention.
3 is a schematic view schematically illustrating the configuration of a strain sensor, a transmitter, and a receiver according to another embodiment of the present invention.
4 is a view for explaining a concept of receiving data measured by each deformation amount measuring sensor of a deformation amount measuring unit in a tire deformation measuring apparatus according to another embodiment of the present invention via respective transmitters, to be.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known general functions or configurations will be omitted.

The tire deformation measuring apparatus of one embodiment of the present invention uses a plurality of deformation measuring sensors (for example, strain gauges) in one channel, and combines the traveling direction deformation measuring sensor and the lateral deformation measuring sensor, Backward) direction of the tire can be predicted.

1 is a schematic block diagram of a tire deformation measuring apparatus according to an embodiment of the present invention. Referring to FIG. 1, a tire deformation measuring apparatus according to the present invention includes a deformation amount measuring unit 100 for measuring a deformation amount of a tire having a plurality of deformation amount measuring sensors 110 installed on a tire, And a deformation amount calculation unit (200) for calculating a deformation amount of the tire by receiving the deformation amount measurement data, wherein the deformation amount measurement unit (100) measures the deformation amount of the deformation amount measurement sensor in a direction parallel to the running direction of the tire And at least one lateral deformation measuring sensor (112) arranged so that the longitudinal direction of the deformation measuring sensor faces the tire width direction, wherein the deformation amount calculating unit (110) Calculates a deformation amount measurement position and a rotation direction using the data obtained from the running direction deformation amount measurement sensor 111 and the lateral direction deformation amount measurement sensor 112, To calculate the amount of deformation in each deformation amount measuring unit 100. [

The deformation amount measuring unit 100 includes a deformation amount measuring sensor 110 including a strain gage and a Wheatstone bridge circuit. A signal processing unit 120 for processing the data measured by the deformation amount measuring sensor and generating a pulse signal; A transmission unit 130 for transmitting the deformation amount measurement data processed by the signal processing unit to the reception unit 210 of the deformation amount calculation unit 200 by wire or wirelessly; And a power supply unit 140 for supplying power to the deformation amount measuring sensor.

The deformation amount measuring sensor 110 may be a strain gauge which is a resistance sensor for measuring a deformation amount of a tire by converting a deformation amount of the tire into an electrical signal. The basic principle of the strain gauge is that when the metal resistor is pulled, the electrical resistance is increased by increasing the length of the metal resistor, and when the metal resistor is compressed, the electrical resistance is decreased. (L: length of the resistor, A: sectional area, p: specific resistance)

That is, when the strain gauge is attached to the tread 1 of the tire 10 and relaxed or shrunk in the longitudinal direction, the resistance value changes in proportion to the amount of deformation. Particularly, as the resistor is thinner and thinner, The deformation amount of the tread can be sufficiently transmitted. On the other hand, in a general strain gage, the change in resistance is measured by measuring the electromotive force (V) due to resistance change using a Wheatstone bridge for reasons of stability and noise generated during signal amplification. In this regard, in the tire deformation measuring apparatus according to the present invention, a plurality of strain measuring sensors (strain gauges) may be connected to one channel.

The tire deformation measuring apparatus according to the present invention obtains signals of each of a plurality of deformation measuring sensors installed in the circumferential direction of the tire, and it is possible to measure the tire behavior in all regions of the tire while the tire is mounted on the vehicle and the rotation is progressing It is effective. As an embodiment of the tire deformation measuring apparatus according to the present invention, when four sensors are used, the region of interest can be extracted four times as much as the case of using one sensor. In this case, the number of sensors is not limited to four, and it is also possible to arrange four to eight sensors at regular intervals by dividing 360 degrees by the number of arbitrary sensors, or to concentrate them at an arbitrary position of interest. The plurality of deformation measuring sensors may be installed in the tread, the shoulder, the sidewall, or the bead, though not necessarily limited thereto.

2 is a view showing an attachment position of the deformation amount measuring sensor 110 in the tire deformation measuring apparatus of the present invention. Referring to FIG. 2, in the tire deformation measuring apparatus of the present invention, the deformation amount measuring sensor 110 is installed in two directions. The lateral direction deformation amount measuring sensor 112 (B) is arranged such that the deformation amount measuring sensor 111 (A) has a length of the deformation amount measuring sensor in a direction parallel to the running direction of the tire, Which is perpendicular to the running direction.

2 is a diagram showing the deformation amount measurement results of the running direction deformation amount measuring sensor 111 and the lateral deformation amount measuring sensor 112 provided at the center of the tire inner tread during tire rotation. As shown in FIG. 2, the shapes of the signals of the running direction deformation measuring sensor 111 and the lateral deformation measuring sensor 112, which are different from each other, are different from each other. 2B shows a measurement signal in the progression (A direction) and c) shows a measurement signal in the horizontal direction (B direction). Since there is a clear difference between the signals in these two directions, the position of the sensor can be determined through this difference.

Even if a plurality of sensors are mounted around the circumference of the tire, it is difficult to distinguish the sensors to which the tires are grounded, and it can not be distinguished when the direction of rotation (forward / backward) is changed. As in the present invention, when four sensors are applied to one measurement channel, if one lateral deformation measuring sensor and three lateral deformation measuring sensors are applied, the position of the sensor can be known and a signal of one rotation can be extracted . You can also see when the rotation has changed. For example, let us assume that sensors 1 to 3 in Fig. 2 (A) are transversal signals, (B) 4 are longitudinal signals, and the sensor signal is AAAB-AAAB-AAAB-AAAB .

The sensor measurement (ground) position of the tire when driving a tire can be found by the following method.

a) AAAB- A AAB-AAAB-AAAB Signal 1
b) A A AB AAAB-AAAB-AAAB 2-one signal
c) A B AA-AAAB-AAAB-AAAB 3 times signal
d) AAAB-AAA B- AAAB-AAAB signal 4 (one rotation detection)

Further, when there is a change in the direction of rotation, the change in the direction of rotation is detected and the measured position of the tire can also be determined.

Change direction of rotation after signal 1
Signal pattern AAAB-A- Rotational Change-AB- AAAB-AAAB-AAB (Summertime Low) -AAAB-AAAB Change direction of rotation after 2nd signal
Signal pattern AAAB-AA- Rotational change - AAB -AAAB-AAAB, -AB (normal rotation) -AAAB-AAAB Change direction of rotation after signal 3
Signal pattern AAAB - AAA - Rotational change - AAAB - AAAB - AAAB - B (normal rotation) - AAAB - AAAB Change direction of rotation after signal No. 4
Signal pattern AAAB- Rotational Change -B -AAAB-AAAB-AAAB -AAAB (Normal Rotation) -AAAB-AAAB

When a specific number of the traveling direction deformation measuring sensors 111 and the lateral deformation measuring sensors 112 are combined, a signal of a certain pattern is generated because the signal difference between the sensors in both directions is distinct. A signal of a pattern different from the original pattern is generated when the rotational direction of the tire changes from straight to reverse or straight back from the deformation amount measurement sensor position at a specific position so that the rotational position and the rotational direction can be predicted.

In another embodiment, a transmitter (transmitter) is installed in each of the plurality of tire deformation measuring sensors 110 as shown in Fig. 3, and the deformation amount data of the tread obtained by the deformation amount measuring sensor is transmitted to the receiving unit of the deformation amount calculating device . When using one common receiver (frequency, etc.) for various transmitters (transmitters) attached to a tire, analysis through one channel is possible, and analysis and storage of a plurality of sensor information can be integrated into one signal. This is very efficient because it can greatly reduce data storage (1 / applied sensor) and exclude unmetered areas of no interest. FIG. 4 shows each received signal received in FIG. 3 and its integrated signal.

The deformation amount calculation unit 200 includes a receiving unit 210 receiving deformation amount measurement data from the transmission unit of the deformation amount measurement unit; A controller 220 for calculating a deformation amount of the tire using the deformation amount measurement data received through the receiver; And a data storage unit 250 for storing strain data calculated by the control unit. And a display unit 230 for displaying the deformation amount data.

The deformation amount calculating unit 200 may be a vehicle control device (not shown) provided on the vehicle body side or a separate device. The display unit 230 may be installed on an instrument panel (not shown) of a vehicle to provide information to a driver.

Hereinafter, the operation of the tire deformation measuring apparatus of the present invention will be described.

The deformation amount measuring sensor 110 of the deformation amount measuring unit 100 measures the deformation amount and the measured data is processed in the signal processing unit 120 and transmitted to the receiving unit 210 of the deformation amount calculating unit 200 through the transmitting unit 130 do.

The receiving unit 210 of the deformation amount calculating unit 200 receives the deformation amount measurement data transmitted from the transmitting unit 120 and the data is transmitted to the control unit 220. The control unit 220 calculates the deformation amount of the tire using the received deformation amount measurement data. Then, the computed tire deformation value is transmitted to the display unit 230, and the driver can grasp the tire deformation value through the display unit 230. At this time, if the computed tire deformation value exceeds the set allowable value, for example, if the deformation increases excessively or the deformation decreases excessively, the control unit 220 sends a signal to the warning sound generating unit 240, The generating unit 240 generates a warning sound or the like to alert the driver. Here, the tire deformation amount value can be suitably selected and displayed in accordance with the purpose of the tire, such as pressure, dynamic load, ground pressure, and the like.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. This will be obvious.

Claims (7)

1. A tire deformation measuring device comprising a deformation amount measuring section for measuring a deformation amount of a tire having a plurality of deformation amount measuring sensors provided on a tire and a deformation amount calculating section for receiving deformation amount measuring data from the deformation amount measuring section and calculating a deformation amount of the tire,
Wherein the deformation amount measuring unit includes at least three deformation amount measuring sensors provided in the longitudinal direction of the deformation amount measuring sensor in a direction parallel to the running direction of the tire and at least one deformation amount measuring sensor disposed in the longitudinal direction of the deformation amount measuring sensor, A lateral deformation amount measuring sensor,
Wherein the deformation amount measuring unit is configured such that transmitters using a common frequency are individually connected to each deformation amount measuring sensor, measurement data of each deformation amount measuring sensor is integrated into one signal, and is transmitted to a receiving unit of the deformation amount calculating unit ,
And the deformation amount calculating unit calculates the deformation amount measuring position and the rotating direction using the data obtained from the running direction deformation amount measuring sensor and the lateral deformation amount measuring sensor and calculates the deformation amount in the deformation amount calculating unit using the deformation amount measuring position and the rotating direction Of the tire.
The apparatus of claim 1, wherein the deformation amount measuring unit comprises a deformation amount measuring sensor including a strain gage and a Wheatstone bridge circuit. A signal processing unit for processing the data measured by the deformation amount measuring sensor to generate a pulse signal; A transmission unit for transmitting the deformation amount measurement data processed by the signal processing unit to the reception unit of the deformation amount calculation unit by wire or wirelessly; And a power supply unit for supplying power to the deformation amount measuring sensor.
The apparatus of claim 1, wherein the deformation amount calculation unit comprises: a receiving unit for receiving deformation amount measurement data from a transmission unit of the deformation amount measurement unit; A control unit for calculating a deformation amount of the tire using the deformation amount measurement data received through the receiving unit; A data storage unit for storing strain data calculated by the control unit; And a display unit for displaying the deformation amount data.
The apparatus according to claim 1, wherein the deformation amount measuring sensor is a strain gage, and the plurality of strain gauges are connected to one channel. delete The apparatus according to claim 1, wherein the plurality of deformation measuring sensors are arranged at equal intervals of 4 to 8 along the circumferential direction of the tire.
The apparatus according to claim 1, wherein the plurality of deformation measuring sensors are installed in a tread portion, a shoulder portion, a side wall portion, or a bead portion of a tire.

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