JPH10324120A - Transponder mounted on tire and tire with transponder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transponder mounted on a tire, and a tire provided with a transponder, capable of automatically detecting and recording the total number of revolutions of the tire and the maximum stress applied to the tire in addition to various kinds of information required. SOLUTION: A transponder having a memorizing part 17 capable of reading and writing information by using an electromagnetic wave and mounted on a tire is provided with a plate-shaped flexible piezoelectric element 10B and is formed into a plate and is buried in the tire tread. A central processing part 18 detects the peak value of output voltage of the piezoelectric element 10B and updates the maximum voltage memorized in the memorizing part 17, and when it detects the rising of a voltage waveform output by the piezoelectric element 10B, it increases by one the total number of revolutions of the tire and records it. These information can show the degree of fatigue of the tire and can be used for judging the need of retreading of a tire casing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transponder for mounting a tire and a tire for mounting the transponder.

[0002]

2. Description of the Related Art Conventionally, a retread tire is used in which a retread process is performed on a tire whose tread has been worn down and the tread is regenerated in a tire casing (base tire). In performing the retreading process, it is necessary to consider the degree of the life of each tire casing (hereinafter, referred to as tire fatigue degree).

[0003] That is, since the tire casing is also a structure, it is destroyed when a force exceeding the maximum load capacity is applied. Further, even when the force is equal to or less than the maximum load capacity, the life of the tire casing is shortened when a stress close thereto is repeatedly applied, and the life of the tire casing is prolonged if the stress applied repeatedly is small.

Here, it is important to determine whether the tire casing can still be used. In the United States, several retread workers are reportedly killed each year due to tire damage while working.

[0005] Usually, when performing the retreading process, an appearance inspection, an internal inspection using ultrasonic waves and X-rays are performed, but it is not possible to grasp the tire fatigue degree even by using such a method. Met. In addition, the history of how the resold tire casing has been used is often unknown, and it has been sometimes more difficult to judge whether the retread is acceptable or not.

[0006] Retreadability can be determined based on whether the maximum stress applied to the tire casing has exceeded the maximum load capacity and whether the number of retreads set by the tire manufacturer has been reached. The number of retreads is generally two to three times, and differs for each tire. In practice, it is desirable to know how much the tire has traveled.

In order to solve such a problem, it has been considered that the history of each tire is given to the tire itself.
As one example of this, a method is known in which a transponder having a storage means capable of reading and writing information is provided in a tire, as disclosed in Japanese Patent Application Laid-Open No. H5-169931.

According to this method, the date of manufacture of the tire,
Information relating to the history of the tire, such as the manufacturing factory and the date of execution of the retread, can be recorded in the tire itself.

However, the above-described transponder cannot automatically detect and record the total number of revolutions, the total running distance, and the like of each tire.

Conventionally, as a system for detecting the number of rotations of a tire, for example, as shown in FIG. 2, a pulse generating plate 1 in the form of a gear formed of a magnetic material or the like on the rotation axis of each wheel, or on the tire or rim. A pickup coil 2 for detecting a pulse is fixedly mounted in the vicinity of the pulse generating plate 1, and an output signal of the pickup coil 2 is detected by a signal processing device 3, and a time interval of a pulse wave signal due to the rotation of the tire 4 is counted. One that calculates the number of rotations of a tire and the tire speed is known.

Further, as shown in FIG. 3, a reflector 6 is provided on a part of the rotating body of the tire 4 or the rim 5, and an optical sensor 7 for receiving light or infrared light is fixed near the reflector 6. The optical sensor 7 is attached by the signal processing device 8.
And the time interval of the pulse wave signal due to the rotation of the reflecting plate 6 accompanying the rotation of the tire 4 is counted,
2. Description of the Related Art There is known a system for calculating a tire rotation speed and a tire speed.

[0012]

However, in the above-described conventional tire rotation speed detection system, there are problems such as an increase in the size of the sensor and the necessity of wiring for transmitting a detection signal. Could not be provided on the tire itself.

In view of the above problems, an object of the present invention is to automatically detect and record the total number of revolutions of individual tires, the maximum stress value applied to the tires, and the like, in addition to various necessary information. It is an object of the present invention to provide a transponder for mounting a tire and a transponder-mounted tire.

[0014]

According to the present invention, there is provided a transponder for mounting a tire, comprising: an information storage means for accessing information in the information storage means by a predetermined signal. The information storage means stores the rotation number count value and the maximum stress value,
Electromagnetic wave receiving means for receiving an electromagnetic wave of a predetermined frequency, energy converting means for converting the electromagnetic wave energy received by the electromagnetic wave receiving means into electric energy, and a voltage corresponding to a pressure applied by stress or the like generated by deformation of a tire. A piezoelectric element for outputting, analog / digital conversion means for converting an output voltage value of the piezoelectric element into digital data and outputting the digital data as a detected value, comparing the detected value with the maximum stress value, Also, when the detected value is larger, the maximum stress value updating means for updating the maximum stress value using the detected value, and the output voltage value of the piezoelectric element exceeds a preset threshold value. A rotation number counting means for counting up and updating the rotation number counting value by +1 at times, and supplied by the energy converting means. Suggest tire mounting transponder operates by electric energy or electric energy output from the piezoelectric element is.

According to the transponder for mounting a tire,
When an electromagnetic wave of a predetermined frequency is received by the electromagnetic wave receiving means, the electromagnetic wave energy is converted into electric energy by the energy conversion means. Further, the piezoelectric element outputs a voltage corresponding to the pressure applied due to stress or the like generated by deformation of the tire, and the output voltage value of the piezoelectric element is converted into digital data by analog / digital conversion means and is detected as a detection value. Is output.
Further, the maximum stress value updating means compares the detected value with the maximum stress value stored in the information storage means,
When the detected value is larger than the maximum stress value,
The maximum stress value is updated using the detected value. Further, when the output voltage value of the piezoelectric element exceeds a preset threshold value, the rotation number counting value stored in the information storage means is incremented by +1 and updated by the rotation number counting means. Is done. Further, the transponder having these various groups operates by electric energy supplied by the energy conversion means or electric energy output from the piezoelectric element.

According to a second aspect of the present invention, there is provided the tire mounting transponder according to the first aspect, further comprising an electric energy storage means for storing the electric energy output from the piezoelectric element.

According to the tire mounting transponder,
The electric energy output from the piezoelectric element is stored by an electric energy storage unit. Thus, when no electric energy is generated by the piezoelectric element and no electric energy is supplied by the energy conversion means, the transponder is driven by the electric energy stored in the electric energy storage means.

According to a third aspect of the present invention, there is provided the tire mounting transponder according to the first or second aspect, wherein at least an electronic circuit portion constituting the transponder is molded by an insulating casing. .

According to the tire mounting transponder,
At least the electronic circuit part that constitutes the transponder is molded by an insulating casing, so that the influence of stress and heat due to tire deformation is suppressed.

According to a fourth aspect of the present invention, there is provided a tire mounting transponder according to any one of the first to third aspects, wherein the piezoelectric element is made of a polymer composite piezoelectric material.

According to the tire mounting transponder,
A piezoelectric element made of a polymer composite piezoelectric material has flexibility and excellent impact resistance, and is easily processed into an arbitrary size.

According to a fifth aspect of the present invention, in the transponder for mounting a tire according to any one of the first to fourth aspects, the piezoelectric element is a transponder for mounting a tire having a flat plate shape having a predetermined thickness and area. suggest.

According to the transponder for mounting a tire,
Since the piezoelectric element has a flat plate shape having a predetermined thickness and area, it is relatively easy to bury the piezoelectric element at a desired position in the tire.

According to a sixth aspect of the present invention, there is provided a transponder-mounted tire including an information storage unit and a tire-mounted transponder for accessing information in the information storage unit by a predetermined signal, wherein the information storage unit of the transponder is rotated. The transponder stores an electromagnetic wave having a predetermined frequency, an electromagnetic wave receiving unit that receives an electromagnetic wave having a predetermined frequency, an energy converting unit that converts electromagnetic wave energy received by the electromagnetic wave receiving unit into electric energy, and a tire. A piezoelectric element that outputs a voltage corresponding to a pressure applied by stress or the like generated by deformation of the piezoelectric element; an analog / digital conversion unit that converts an output voltage value of the piezoelectric element into digital data and outputs the digital data as a detection value; Comparing the detected value with the maximum stress value, A maximum stress value updating unit that updates the maximum stress value using the detected value when the detected value is larger than the detected value, and an output voltage value of the piezoelectric element exceeds a predetermined threshold value. And a rotation speed counting means for updating the rotation speed counting value by +1 when the rotation speed counting value is updated, and a transponder operated by electric energy supplied by the energy conversion means or electric energy output from the piezoelectric element. Suggest a tire to wear.

According to the transponder-equipped tire, when an electromagnetic wave having a predetermined frequency is received by the electromagnetic wave receiving means, the electromagnetic wave energy is converted into electric energy by the energy conversion means. Also, by the piezoelectric element,
A voltage corresponding to the pressure applied by the stress or the like generated by the deformation of the tire is output, and the output voltage value of the piezoelectric element is converted into digital data by analog / digital conversion means and output as a detection value. Further, the maximum stress value updating means compares the detected value with the maximum stress value stored in the information storage means, and uses the detected value when the detected value is larger than the maximum stress value. Thus, the maximum stress value is updated. Further, when the output voltage value of the piezoelectric element exceeds a preset threshold value, the rotation number counting value stored in the information storage means is incremented by +1 and updated by the rotation number counting means. Is done. Further, the transponder having these various groups operates by electric energy supplied by the energy conversion means or electric energy output from the piezoelectric element.

According to a seventh aspect of the present invention, there is provided the transponder-mounted tire according to the sixth aspect, wherein at least the piezoelectric element is provided on a sidewall of a pneumatic tire.

According to the transponder-mounted tire, at least the piezoelectric element is provided on the side wall portion where the amount of deformation of the tire is large when the tire is mounted on the vehicle.

According to claim 8, in the transponder-mounted tire according to claim 6, at least the piezoelectric element is provided at a terminal portion of a steel belt embedded in a tread portion of a pneumatic tire. Suggest.

According to the transponder-mounted tire, at least the piezoelectric element is provided at the end of the steel belt embedded in the tread portion where the amount of deformation of the tire when the vehicle is mounted is large.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an external view showing a transponder for mounting a tire in the present embodiment. In the figure, reference numeral 10 denotes a transponder,
A, a loop-shaped transmitting / receiving antenna 11A, 11B and a piezoelectric element 10B, which are formed in a sheet shape sandwiched between non-conductive base sheets 10C, 10D made of unvulcanized rubber. This is because the transponder body 10A is made of conductive rubber used in the tire.
This is because the base sheets 10C and 10D have a role to insulate the electronic circuit and the transmitting and receiving antennas 11A and 11B from each other and to prevent each component from being separated (disconnected) during molding.

In the transponder main body 10A, an electronic circuit is formed on a ceramic substrate by printing, and the electronic circuit is molded with a ceramic insulator.
It has a rectangular parallelepiped shape of 10 mm in length and 2 mm in thickness.

The piezoelectric element 10B generates electric power in response to externally applied pressure. When the piezoelectric element 10B is mounted on a tire, stress generated by deformation of the tire is applied to the piezoelectric element 10B. This generates an electromotive force. The piezoelectric element 10B is made of, for example, a polymer composite piezoelectric material in which fine particles of a ceramic piezoelectric material are dispersed in a fluoropolymer base material, and has flexibility.
It has excellent impact resistance.

The transmitting and receiving antennas 11A and 11B may be coiled or printed depending on the frequency to be used. However, when embedded in a tire, a low frequency with good permeability is desirable. did. The transponder 10 uses a rectenna (simultaneous transmission and reception) method as a communication format.

FIG. 4 is a block diagram of an electric circuit showing the transponder 10. In the figure, reference numeral 10A denotes a transponder main body, a receiving antenna 11A, a transmitting antenna 1
1B, rectifier circuit 12A on the electromagnetic induction side, rectifier circuit 12B on the piezoelectric element side, receiver 13, analog / digital (hereinafter A
/ D) conversion circuits 14, 15, a capacitor 16, a storage unit 17, a central processing unit 18, and a transmission unit 19.

The electromagnetic induction side rectifier circuit 12A and the piezoelectric element side rectifier circuit 12B are composed of diodes 121 and 122, a capacitor 12
3, and a resistor 124 to form a well-known full-wave rectifier circuit. A receiving antenna 11A is connected to the input side of the electromagnetic induction side rectifier circuit 12A.
The high-frequency current induced in 1A is rectified and converted into a direct current, which is stored in the battery 16 and output at the same time as a driving power source for other components, that is, the storage unit 17, the central processing unit 18, the transmission unit 19, and the like. is there. Similarly, the piezoelectric element 10B is connected to the input side of the piezoelectric element side rectifier circuit 12B, and rectifies the current generated in the piezoelectric element 10B, converts the current into DC, and stores the DC in the battery 16.

The receiver 13 detects a high-frequency signal induced in the receiving antenna 11A and outputs it to the A / D conversion circuit 14.

The A / D conversion circuit 14 converts an analog signal input from the receiver 13 into a digital signal and outputs the digital signal to the central processing unit 18.

The A / D conversion circuit 15 converts the value of the analog output voltage of the piezoelectric element 10 B into a digital value by the central processing unit 18.
Output to

The central processing unit 18 includes a well-known CPU 181 and a digital / analog (hereinafter, referred to as D / A) converter.
The CPU 181 is operated by a program stored in a storage unit 17 including a semiconductor memory such as a ROM and an EEPROM when driven by power supply, and executes processing according to a command received by the receiver 13. I do. When the received command is an information transmission command, the information stored in the storage unit 17 is read, and the information is output to the transmission unit 19 via the D / A converter 182.

The transmitting section 19 includes an oscillation circuit 191 and a modulation circuit 192.
And a high-frequency amplifier circuit 193, and modulates, for example, a 300 MHz carrier wave oscillated by the oscillation circuit 191 based on the information signal input from the central processing unit 18.
The signal is modulated by 192 and supplied to the transmitting antenna 11B via the high frequency amplifier 193.

On the other hand, when reading / writing information from / to the transponder 10 described above, for example, a scanner as shown in FIG. 5 is used. In the figure, reference numeral 20 denotes a scanner, a receiving antenna 21, a receiving unit 22, a central processing unit 23,
It comprises a keyboard 24, a display unit 25, a transmission unit 26, a transmission antenna 27, and a power supply unit 28 for supplying power to these.

Here, the scanner 20 in this embodiment is
Is the first for the transponder 10 as described below.
The information access to the transponder 10 is performed by receiving the electromagnetic wave of the second frequency radiated from the transponder 10 while radiating the electromagnetic wave of the frequency.

The receiving section 22 of the scanner 20 includes a receiver 221
And an analog / digital (hereinafter, referred to as A / D) converter 222. The input side of the receiver 221 is connected to the receiving antenna 21, receives a high frequency of 300 MHz, detects this, and then detects the A / D. Central processing unit 2 via converter 222
Output to 3.

The central processing unit 23 comprises a well-known CPU 231, a memory 232, and a switch 233.
When the switch 233 is turned on based on the command input from the keyboard 24, the information read command, the information write command, the write information, and the like are transmitted to the transmitting unit 26, and the information input from the receiving unit 22 is stored in the memory. 232 and displayed on the display unit 25.

Further, the transmitting section 26 is composed of a modulation circuit 261 and an oscillation circuit 262. Is modulated by the modulation circuit 261 and output to the transmitting antenna 27.

The scanner 20 is incorporated in a pistol-shaped housing 20A, for example, as shown in FIG. A receiving antenna 21 and a transmitting antenna 27 are disposed at the tip of the housing 20A, and a keyboard 2 is provided on the upper surface.
4 and a display unit 25 are arranged. Further, a switch 233 is disposed at a trigger position in front of the grip 20B.

The transponder 10 having the above configuration
Is the inner wall surface 41 of the tire 4 as shown in FIGS.
Or buried in the tire 4. At this time, it is desirable to attach to a position where the stress and pressure generated in the tire 4 can be accurately detected and a position where the rotation of the tire 4 can be accurately detected. For example, tire 4
It is effective to attach it to the terminal portion of the steel belt 44 embedded in the side wall portion 42 and the tread portion 43 of FIG.

On the other hand, as shown in FIG. 9, the management of the tires 4 to which the transponders 10 are attached can be easily performed even at the time of manufacturing or the like by using the above-mentioned handy type scanner 20, and the data processing device is used. 5
An antenna 53 via a transmission / reception controller 52
By connecting a and 53b, the management terminal 54 can centrally manage the tire 4 in use with the transponder 10 attached. In this case, as shown in FIG. 10, by providing the antenna 53a along a road on which a vehicle 58 such as a truck equipped with a transponder-equipped tire runs, tires of the running vehicle 58 can also be managed.

Further, as shown in FIG. 9, by providing a processing device 55, a display unit 56 connected to the processing device 55, and a vehicle-mounted antenna 57 in the vehicle, information on tires used by the driver himself in the driver's seat can be easily obtained. Can be obtained. In this case, as shown in FIG. 11, an in-vehicle antenna 57 is provided in the vicinity of each tire 4 for each individual tire 4, and the plurality of in-vehicle antennas 54 are switched using a multiplexer or the like, so that the power (power) of radio waves used for information access is increased. ) Can be minimized.

The timing of information access to a plurality of transponders 10 in each tire 4 may be obtained by sequentially transmitting a data transmission command to each transponder 10. In the case of a double wheel such as a truck, since a plurality of transponders 10 enter the communication range depending on the power of the interrogation wave, an individual transmission command designating each transponder 10 is used. If the power of the interrogation wave is small (such as the above-mentioned handheld scanner), a broadcast command not specifying a specific transponder is transmitted.
As a result, even when the ID code of the transponder 10 is unknown, the data can be read, and the data from the transponder 10 does not interfere.

The storage unit 17 of the transponder 10
By storing the tire circumference, the total running distance and the running speed can be calculated from the total number of rotations of the tire. This calculation process may be performed in the transponder 10, or may be performed in the scanner 20, the data processing device 51, and the processing device 55.

Next, an example of the operation of the transponder 10 for counting the number of revolutions and detecting the maximum stress will be described with reference to the flowchart of FIG. When the central processing unit 18 starts its operation, it supplies power by radio wave reception or the piezoelectric element 10.
It is determined whether power is supplied from B and the circuit is operable (SA1). As a result of this determination, when the circuit is operable, the output voltage value Va of the piezoelectric element 10B obtained from the data input from the A / D conversion circuit 15 is compared with a threshold value Vt set in a program in advance. And
It is determined whether or not the output voltage value Va of the piezoelectric element 10B is equal to or more than the threshold value Vt (SA2).

As a result of the determination in SA12, the piezoelectric element 10
When the output voltage value Va of B is smaller than the threshold value Vt, the process proceeds to SA7 described later. When the output voltage value Va of the piezoelectric element 10B is equal to or more than the threshold value Vt, the rising of the output voltage waveform of the piezoelectric element 10B is performed. It is determined whether or not the detection was successful (SA3).

If the result of this determination is that the rising of the output voltage waveform of the piezoelectric element 10B cannot be detected, the SA
The process proceeds to the process of No. 5, and when the detection is successful, the count value of the total number of tire revolutions stored in the storage unit 17 is incremented by +1 and updated (SA4).

FIG. 13 shows a change in the output voltage of the piezoelectric element 10B with the rotation of the tire. Here, 90 of tire 4
It is assumed that the transponder 10 is buried at the position of the degree. As shown in the figure, as the stress applied to the piezoelectric element 10B of the transponder 10 increases, the piezoelectric element 10B
Increases in the positive direction, increases in the negative direction as the stress applied to the piezoelectric element 10B decreases, and outputs a one-cycle sine wave AC voltage.

The central processing unit 18 performs a filtering process on the output waveform of the piezoelectric element 10B based on the data input from the A / D conversion circuit 15 (the filtered waveform V
f) Comparing this (the output voltage Va of the filtered piezoelectric element 10B) with a threshold value Vt to generate a binarized waveform (Vb), and then performing a differentiation process on the binary waveform (Vb) to obtain the piezoelectric element 10B The rising edge of the voltage output is detected.

After the processing of SA4, the central processing unit 18
Determines whether the peak value Vp of the output voltage of the piezoelectric element 10B is greater than the maximum voltage value V _MAX stored in the storage unit 17 (SA5), and determines whether the peak value Vp is equal to the maximum voltage value V _MAX.
When following _MAX shifts to the process of SA7 described later, the peak value Vp is updated maximum voltage value V _MAX by using the peak value Vp when greater than the maximum voltage value V _MAX, that is, the maximum voltage peak value Vp stored in the storage unit 17 as the value V _MAX (SA6).

Next, the central processing unit 18 determines whether or not a detection information transmission command has been received (SA7). If the detection information transmission command has not been received, the process proceeds to SA1. Stores the count value of the total number of revolutions of the tire and the maximum voltage value V _MAX in the transmission register (SA8), and sends the data in the transmission register to the transmission unit 19 (SA).
9).

Thereafter, the flow shifts to the processing of SA1.

Next, the scanner 20 and the data processing device 51
FIG. 14 shows an example of the reading processing operation of the tire total rotation speed and the maximum voltage value V _{MAX in} the processing device 55 and the processing device 55.
A description will be given based on the flowchart of FIG. Scanner 20
Starts the operation, the central processing unit 23 performs initial processing (SB1). In the initial processing, a switch input, a periodic input using a timer, and the like are set, and when a specific one is selected from a plurality of transponders 10 embedded in tires of a plurality of wheels, an antenna to be used is selected. Location or transponder specific ID,
Alternatively, specify both of them.

Next, the central processing unit 23 determines whether or not the data reading trigger is turned on, for example, whether or not the switch 233 is turned on (SB2). When the data reading trigger is turned on, the ID or the ID specifying the transponder 10 is determined. The data such as the information read command is stored in the transmission register (SB3), the data in the transmission register is transmitted to the transmission section 26 for transmission, and the watchdog timer (WDT) is started (SB4). Thus, the command stored in the transmission register is transmitted to the transponder 10.

Next, the central processing unit 23 determines whether a response has been received from the transponder 10 (SB
5). If the result of this determination is that a response from the transponder 10 has not been received, it is determined whether or not the time of the watchdog timer has expired (SB6). If the time has not expired, the flow shifts to the process of SB5. When the watchdog timer times out, an alarm is output (SB7), and it is determined whether an alarm reset has been input (SB8).

If the result of this determination is that an alarm reset has not been input, the process of SB7 is continued, and if an alarm reset has been input, the flow shifts to the process of SB13 described later.

When a response is received from the transponder 10 as a result of the determination in SB5, at least the received data such as the ID of the transponder is collated (SB
9), determine whether the received data is normal (SB)
10).

If the result of this determination is that there is an error in the received data, the process proceeds to the above-mentioned SB7 and an alarm is output,
Received data abnormality when no received data, i.e. calculated total tire rotational speed, the maximum voltage value V _MAX traveling distance based on data such as the running speed, the maximum stress or the like applied to the tire (SB11), This is displayed (SB12).

Next, the central processing unit 23 stores these data in the memory 232 together with the data indicating the date of detection (SB13).

As described above, according to the present embodiment, in the transponder 10, the electromagnetic wave energy received from the scanner 20 or the like is converted into electric energy and
6, the electric power generated from the piezoelectric element 10B due to the deformation of the tire 4 is stored in the electric storage 16, and the transponder 10 is driven by the electric energy, and the total rotation number and the maximum stress value of the tire are automatically calculated. Since the information is detected and stored in the storage unit 17, it is possible to grasp the degree of fatigue of the tire 4 based on the information, and it is possible to accurately determine whether the retread is possible.

For example, when the vehicle gets over a step or the like, when the tire air pressure is lower than a specified value, or when the load is extremely large (overloading), the deformation of the tire becomes large, and the tire casing is broken. . If the detected maximum stress (maximum voltage value V _MAX ) exceeds the durability of the tire casing (depending on the tire), it is determined that there is a risk of breaking the tire casing, and use of the tire casing is prohibited. Processing such as prohibition of use on a base tire can be taken. Furthermore, it can be effectively used as data in the tire compensation problem.

Further, since it is not necessary to replace the battery as in the prior art, even if the transponder 10 is embedded in the tire 4, the transponder 10 can be used semi-permanently. Even under manufacturing or use conditions, the function of the transponder 10 does not deteriorate.

Further, since the electric energy is stored in the electric storage device 16, when the electric energy is not generated by the piezoelectric element 10 B and the electromagnetic wave from the scanner 20 is not received, the transponder is stored by the electric energy stored in the electric storage device 16. Since the device 10 is driven, the information stored in the transponder 10 can be obtained whenever necessary.

Further, the electronic circuit portion constituting the transponder main body 10A is molded by an insulating casing, and the influence of stress and heat due to tire deformation is suppressed.
Even under the conditions of manufacturing or using the tire 4 at a high temperature, a decrease in the function as a transponder can be further prevented.

A piezoelectric element made of a polymer composite piezoelectric material has flexibility and excellent impact resistance, and can be easily processed into an arbitrary size. In addition to setting the shape of the piezoelectric element, a desired voltage can be easily obtained by changing the size.

The present embodiment is an example, and the present invention is not limited to this. For example, any number of transponders 10 may be mounted in the tire 4, and it is preferable that the transponder 10 is mounted at a location effective for detecting the rotational speed and detecting the maximum stress.

In detecting the peak voltage of the piezoelectric element 10B, the stress applied to the tire is detected stepwise by providing a threshold in several steps or setting the detection range in several steps, and the number of times is recorded. You may do it.

In this embodiment, the transponder body 10A and the piezoelectric element 10B are formed integrally, but they may be separated.

[0076]

As described above, according to the tire mounting transponder of the first aspect of the present invention, when an electromagnetic wave of a predetermined frequency is received by the electromagnetic wave receiving means, the electromagnetic wave energy is converted into electric energy by the energy conversion means. The electric energy generating means converts the stress generated by the deformation of the tire into electric energy.The transponder is driven by the electric energy, and the total number of revolutions and the maximum stress value of the tire are automatically calculated. Since it is detected and stored in the information storage means, it is possible to grasp the tire fatigue degree based on the information, and it is possible to accurately determine whether or not the retread is possible, and to replace the battery as in the conventional case. It is not necessary to carry out, so even if the transponder is embedded in the tire, it is semi-permanent Made available to. Further, since a battery is not used, the function as a transponder does not decrease even under the conditions of manufacturing or using a tire at a high temperature.

According to the transponder for mounting a tire according to the second aspect, in addition to the above effects, the electric energy generated by the piezoelectric element is stored by the electric energy storage means. Thereby, when electric energy is not generated by the piezoelectric element and electric energy is not supplied by the energy conversion means, the transponder is driven by the electric energy stored in the electric energy storage means.
When necessary, the predetermined information stored in the transponder can be obtained.

According to the transponder for mounting a tire according to the third aspect, in addition to the above-mentioned effects, at least the electronic circuit portion constituting the transponder is molded by an insulating casing, and is caused by stress or heat due to tire deformation. Since the influence is suppressed, it is possible to further prevent the function as a transponder from deteriorating even under the conditions of manufacturing or using a high-temperature tire.

According to the transponder for mounting a tire according to the fourth aspect, in addition to the effects described above, the piezoelectric element made of the polymer composite piezoelectric material has flexibility and excellent impact resistance, and Since the size of the piezoelectric element can be easily processed, the shape of the piezoelectric element can be set in accordance with a desired embedded position in the tire, and a desired voltage can be easily obtained by changing the size.

Further, according to the transponder for mounting a tire according to the fifth aspect, in addition to the above effects, the piezoelectric element has a flat plate shape having a predetermined thickness and area.
Embedding in the tire does not cause a decrease in tire performance.

According to the transponder mounted tire of the present invention, when an electromagnetic wave having a predetermined frequency is received by the electromagnetic wave receiving means, the electromagnetic wave energy is converted into electric energy by the energy conversion means, and further, the electric energy generation means Thus, the stress generated by the deformation of the tire is converted into electric energy, the transponder is driven by the electric energy, and the total number of revolutions and the maximum stress value of the tire are automatically detected and the information storage means in the transponder Since it is stored in the tire, it is possible to grasp the tire fatigue level based on this information, and it is possible to accurately determine whether or not the retread is possible, and it is not necessary to perform the battery replacement work as in the conventional case. , And can be used semi-permanently. In addition, since a battery is not used as a driving power source for the transponder,
The function as a transponder does not decrease even under the conditions of manufacturing or using the tire at a high temperature.

According to the transponder-mounted tire according to the seventh aspect, in addition to the above-mentioned effects, at least the piezoelectric element is provided on the sidewall portion where the amount of deformation of the tire is large when the tire is mounted on the vehicle. Can be accurately detected, and electric energy can be efficiently obtained.

According to the transponder-mounted tire according to the eighth aspect, in addition to the above-mentioned effects, at least the piezoelectric element has a terminal portion of a steel belt embedded in a tread portion where the amount of deformation of the tire is large when mounted on a vehicle. Therefore, the maximum stress applied to the tire and the rotational speed of the tire can be accurately detected, and electric energy can be efficiently obtained.

[Brief description of the drawings]

FIG. 1 is an external view showing a transponder for mounting a tire according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional tire rotation number detection system.

FIG. 3 is a configuration diagram showing a conventional tire rotation number detection system.

FIG. 4 is a block diagram of an electric circuit showing a transponder according to an embodiment of the present invention.

FIG. 5 is a block diagram of an electric circuit showing a scanner according to the transponder of the present invention.

FIG. 6 is an external view showing a scanner according to the transponder of the present invention.

FIG. 7 is a diagram illustrating an example of mounting a transponder according to the present invention on a tire;

FIG. 8 is a diagram illustrating an example of mounting a transponder of the present invention on a tire.

FIG. 9 is a diagram illustrating a tire management system using the transponder of the present invention.

FIG. 10 is a diagram illustrating a tire management system using the transponder of the present invention.

FIG. 11 is a view for explaining an arrangement example of a vehicle-mounted antenna according to an embodiment of the present invention.

FIG. 12 is a flowchart illustrating a rotation speed and maximum stress detection operation in the transponder according to the embodiment of the present invention;

FIG. 13 is a view for explaining waveform processing at the time of detecting the rotational speed and the maximum stress in the transponder according to the embodiment of the present invention;

FIG. 14 is a flowchart illustrating a rotation speed and a maximum stress reading operation in the scanner according to the embodiment of the present invention.

[Explanation of symbols]

10 transponder, 10A transponder body,
10B: piezoelectric element, 11A: receiving antenna, 11B: transmitting antenna, 12A: electromagnetic induction side rectifier circuit, 12B: piezoelectric element side rectifier circuit, 13: receiver, 14, 15: A / D
Conversion circuit, 16: storage unit, 17: storage unit, 18: central processing unit, 19: oscillation unit, 16: transmission antenna, 17: storage unit, 18: second rectifier circuit, 19A: piezoelectric element, 20
... Scanner, 20A ... Housing, 20B ... Grip, 21 ...
Receiving antenna, 22 ... receiving unit, 23 ... central processing unit, 24
... keyboard, 25 ... display part, 26 ... transmitting part, 27 ... transmitting antenna, 28 ... power supply part, 4 ... tire, 41 ... tire inner wall surface, 42 ... sidewall part, 43 ... tread part, 44 ... steel belt, 51 ... data processing device, 5
2 ... controller, 53a, 53b ... antenna, 54 ...
Management terminal, 55: processing unit, 56: display unit, 5
7: onboard antenna, 58: vehicle.

Claims (8)

[Claims] 1. A tire mounting transponder comprising information storage means for accessing information in said information storage means by a predetermined signal, wherein said information storage means stores a rotation number count value and a maximum stress value, Electromagnetic wave receiving means for receiving an electromagnetic wave of a predetermined frequency; energy converting means for converting electromagnetic wave energy received by the electromagnetic wave receiving means into electric energy; and a voltage corresponding to a pressure applied by stress or the like generated by deformation of a tire. A piezoelectric element for outputting, an analog / digital conversion means for converting an output voltage value of the piezoelectric element into digital data and outputting the digital data as a detection value, comparing the detection value with the maximum stress value, When the detected value is larger than the maximum stress value, the maximum stress value is updated using the detected value. Force value updating means, and when the output voltage value of the piezoelectric element exceeds a preset threshold value, the rotation number counting means updates the rotation number count value by +1 and updates the rotation number. A transponder for mounting a tire, wherein the transponder is operated by electric energy supplied by the energy conversion means or electric energy output from the piezoelectric element. 2. The tire mounting transponder according to claim 1, further comprising electric energy storage means for storing electric energy output from said piezoelectric element. 3. The transponder for mounting a tire according to claim 1, wherein at least an electronic circuit part constituting the transponder is molded by an insulating casing. 4. The transponder according to claim 1, wherein the piezoelectric element is made of a polymer composite piezoelectric material. 5. The transponder for mounting a tire according to claim 1, wherein the piezoelectric element has a flat shape having a predetermined thickness and area. 6. A transponder-mounted tire comprising an information storage means and a tire-mounted transponder for accessing information in the information storage means by a predetermined signal, wherein the information storage means of the transponder has a rotation count value and a maximum. The transponder stores an electromagnetic wave having a predetermined frequency, an electromagnetic wave receiving unit that receives an electromagnetic wave having a predetermined frequency, an energy converting unit that converts the electromagnetic wave energy received by the electromagnetic wave receiving unit into electric energy, and a transponder generated by deformation of a tire. A piezoelectric element that outputs a voltage corresponding to a pressure applied by stress or the like; analog / digital conversion means that converts an output voltage value of the piezoelectric element into digital data and outputs the digital data as a detection value; Comparing with the stress value, and detecting the above than the maximum stress value. When the value is larger, the maximum stress value updating means for updating the maximum stress value using the detected value, When the output voltage value of the piezoelectric element exceeds a preset threshold value, A transponder having rotation number counting means for counting up and updating the rotation number counting value by +1; and operating by electric energy supplied by the energy conversion means or electric energy output from the piezoelectric element. Wearing tires. 7. The transponder-mounted tire according to claim 6, wherein at least the piezoelectric element is provided on a sidewall of the pneumatic tire. 8. The transponder-mounted tire according to claim 6, wherein at least the piezoelectric element is provided at a terminal portion of a steel belt embedded in a tread portion of the pneumatic tire.