JP2003011628A - Wheel speed signal generator, abnormal signal output method, and tire abnormality detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect abnormality of a tire without affecting on a traveling state of a vehicle at a low cost. SOLUTION: A current generating circuit 14 feeds a current to a rotor coil 12, when the temperature of a tread detected by a temperature sensor 13 reaches a prescribed threshold or more. When the current is fed from the current generating circuit 14, the rotor coil 12 generates a magnetic flux in the direction penetrating therethrough. When a yoke 17 is opposed to the rotor coil 12, a pickup coil 18 generates a wheel speed signal (wheel speed signal including abnormal signal) having a waveform different from that in a case where yoke 17 is not opposed to the rotor coil 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel speed signal generator, an abnormality signal output method, and a tire abnormality detection device, and more particularly to a wheel speed signal generation device and abnormality detecting a tire abnormality using a wheel speed signal. The present invention relates to a signal output method and a tire abnormality detection device.

[0002]

[Prior Art and Problems to be Solved by the Invention]
In Japanese Patent Laid-Open No. 000-255230, a method of detecting an emergency running state from a wheel speed signal affected by the vibration by generating vibration in proportion to the wheel speed in the emergency running state (hereinafter referred to as "prior art 1"). Is proposed.

According to the prior art 1, in order to superimpose a vibration signal indicating an emergency running state on the wheel speed signal, the tire rubber is designed so that a characteristic uniformity disturbance is generated when the vehicle travels in a state where the air pressure is reduced. ing.

However, the signal superposed on the wheel speed signal in an emergency running state is not an electrically generated signal but a signal generated by vibrating the actual wheel motion. For this reason, there is a possibility that the running stability may be adversely affected, and there is a problem that the vehicle is in a dangerous state. Further, in order to generate the above-mentioned vibration, it is necessary to mount a dedicated tire, which causes a problem of high cost.

On the other hand, in Japanese Unexamined Patent Publication No. 10-54770, a device for measuring a gas temperature inside a tire, wirelessly transmitting data indicating a measurement result, and warning a tire abnormality based on the transmitted data ( Hereinafter, “Prior Art 2”) has been proposed.

However, since the gas temperature inside the tire usually has a delay in temperature change as compared with the tread internal temperature, there is a possibility that an emergency alarm may be delayed. Further, since a wireless device is used to transmit the measured data, there is a problem that the system becomes expensive.

The present invention has been proposed to solve the above-mentioned problems, and a wheel speed signal generator for detecting an abnormality in a tire without affecting the running state of the vehicle and at a high cost, and an abnormality. An object is to provide a signal output method and a tire abnormality detection device.

[0008]

The invention according to claim 1 is
Abnormal signal output means for outputting an abnormal signal when an abnormality occurs in the tire, and a wheel speed signal corresponding to the rotation speed of the wheel are generated, and are affected by the abnormal signal output by the abnormal signal output means. Signal generating means for generating a wheel speed signal.

According to the first aspect of the present invention, the abnormality signal output means detects whether the tire has abnormality, and outputs the abnormality signal when the tire has abnormality. The tire abnormality is, for example, when the temperature inside the tread of the tire exceeds a predetermined threshold value. The signal generating means generates a wheel speed signal according to the rotation speed of the wheel. Here, the wheel speed signal is affected by the abnormal signal when the abnormal signal output means outputs the abnormal signal output. Therefore, it is possible to generate a wheel speed signal for detecting the occurrence of a tire abnormality without using a special device such as a wireless device.

According to a second aspect of the present invention, there is provided a signal rotor having a plurality of teeth made of a magnetic material formed along the outer periphery of the rotating body, the signal rotor rotating in response to rotation of the wheel, and a specific one of the signal rotors. Magnetic flux generated between the rotor coil provided so as to correspond to the teeth, the abnormal signal output means for outputting an abnormal signal to the rotor coil when an abnormality occurs in the tire, and the teeth formed on the signal rotor. A pickup for generating a wheel speed signal in response to a change in the wheel speed signal, and for generating a wheel speed signal affected by an abnormal signal flowing through the rotor coil when facing the rotor coil,
Is equipped with.

According to the second aspect of the present invention, when the signal rotor rotates with the rotation of the wheel, the air gap changes between the teeth of the signal rotor and the pickup, and the magnetic flux generated therebetween changes. Occurs. As a result, the pickup generates a wheel speed signal according to the change in magnetic flux, that is, the rotation speed of the wheel.

On the other hand, the abnormal signal output means outputs a current to the rotor coil when an abnormal state of the tire is detected. When a current is supplied by the abnormal signal output means, the rotor coil generates a magnetic flux in a direction penetrating the inside. Therefore, each time the rotor coil and the pickup face each other, the magnetic flux between the rotor coil and the pickup further changes. As a result, the pickup produces a wheel speed signal containing a periodic abnormal signal.

The number of rotor coils is not limited to one, but may be two or more. At this time, at this time, it is preferable that the rotor coils are arranged at equal intervals with other adjacent rotor coils.

According to a third aspect of the present invention, there is provided a signal rotor having a plurality of magnets arranged adjacent to each other along the outer periphery of the rotating body so as to have different polarities, the signal rotor rotating in response to rotation of the wheel, and a specific rotor. A change in the magnetic flux generated between the rotor coil provided so as to correspond to the magnet, the abnormal signal output means for outputting an abnormal signal to the rotor coil when an abnormality occurs in the tire, and the magnet of the signal rotor And a pickup that generates a wheel speed signal in response to the abnormal signal flowing through the rotor coil when facing the specific magnet.

According to the third aspect of the present invention, when the signal rotor rotates with the rotation of the wheels, the magnetic flux between the signal rotor and the pickup changes. The pickup generates a wheel speed signal according to the change in magnetic flux, that is, the rotation speed of the wheel.

On the other hand, the abnormal signal output means outputs a current to the rotor coil when an abnormal state of the tire is detected. When a current is supplied by the abnormal signal output means, the rotor coil generates a magnetic flux in a direction penetrating the inside. Therefore, the magnetic flux between the signal rotor and the pickup is further changed every time the specific magnet provided with the rotor coil and the pickup face each other. As a result,
The pickup periodically generates a wheel speed signal including an abnormal signal.

The number of rotor coils is not limited to one, but may be two or more. At this time, it is preferable that the rotor coils are arranged at equal intervals with other adjacent rotor coils.

According to a fourth aspect of the present invention, an abnormality signal is generated when an abnormality occurs in the tire, the generated abnormality signal is superimposed on the wheel speed signal, and the wheel speed signal on which the abnormality signal is superimposed is output. It is characterized by

According to the fourth aspect of the present invention, the abnormality signal generated when an abnormality occurs in the tire is output by superimposing it on the wheel speed signal without using a special device such as a radio. It is possible to obtain a wheel speed signal for detecting that a tire abnormality has occurred.

According to a fifth aspect of the present invention, the wheel speed signal generator according to any one of the first to third aspects and the wheel speed signal generated by the wheel speed signal generator include the abnormal signal. Tire abnormality detection means for detecting that there is a tire abnormality when the affected wheel speed signal is included.

According to the fifth aspect of the present invention, among the wheel speed signals generated by the wheel speed signal generator, there is a wheel speed signal including a periodic abnormal signal. The tire abnormality detecting means determines whether or not the wheel speed signal generated by the wheel speed signal generator includes an abnormality signal, and if the abnormality signal is included, it is determined that there is a tire abnormality. To do. As a result, the tire abnormality can be detected without using an expensive device such as a wireless device or a slip ring. When it is detected that there is a tire abnormality, it is preferable to issue a tire abnormality warning to the display means or issue a sound abnormality warning.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment] As shown in FIG. 1, a tire abnormality detecting apparatus according to a first embodiment of the present invention outputs a wheel speed signal according to a rotational angular speed of a wheel. A sensor 10, an input processing circuit 20 that performs predetermined signal processing such as noise removal included in a wheel speed signal, and a micro that performs tire abnormality determination based on the wheel speed signal that has been signal processed by the input processing circuit 20. Computer 3
0 and an LCD (Liquid
Crystal Display) 40.

The wheel speed sensor 10 is composed of a signal rotor 11 that rotates with the wheels and a pickup 15 that generates a wheel speed signal according to the rotation of the signal rotor 11. The signal rotor 11 is made of a magnetic material, and the outer periphery of the signal rotor 11 is formed in a tooth shape. The rotor coil 12 is wound around one tooth on the outer circumference of the signal rotor 11. The signal rotor 11 is adapted to rotate together with the wheels.

Further, a temperature sensor 13 for detecting the temperature of the tread is embedded in the tread of the tire.
The wheel of the tire is equipped with a current generation circuit 14 for supplying a current to the rotor coil 12 based on the temperature of the tread. Here, the current generation circuit 14 does not generate a current when the temperature of the tread detected by the temperature sensor 13 is lower than a predetermined threshold value, and generates a current when the temperature of the tread becomes equal to or higher than a predetermined threshold value.

The pickup 15 includes the signal rotor 11
The radial direction of the signal rotor 11 is fixed so as to face the outer peripheral teeth of the signal rotor 11 with an appropriate air gap. Specifically, the pickup 15 includes a permanent magnet 16 that generates a magnetic flux, a yoke 17 that guides the magnetic flux from the permanent magnet 16 to the signal rotor 11, and a pickup coil 18 that is wound around the yoke 17. There is.

When the signal rotor 11 is not rotating, the air gap between the signal rotor 11 and the yoke 17 is constant, and the magnetic flux penetrating the yoke 17 is constant. When the signal rotor 11 is rotating, the air gap between the signal rotor 11 and the yoke 17 changes, and the yoke 17
The magnetic flux penetrating through changes according to the rotation speed of the signal rotor 11. The pickup coil 18 generates an AC voltage (wheel speed signal) according to the change of the magnetic flux penetrating the inside of the yoke 17, and supplies this wheel speed signal to the input processing circuit 20.

The input processing circuit 20, for example, removes high band noise included in the wheel speed signal generated by the pickup coil 18, and further performs pulse waveform shaping of the wheel speed signal to complete signal processing. The wheel speed signal of the above is supplied to the microcomputer 30.

The microcomputer 30 detects the wheel speed based on the wheel speed signal supplied from the input processing circuit 20 and determines whether or not there is a tire abnormality. When there is a tire abnormality, an alarm display is displayed on the LCD 40. To do.

The tire abnormality detecting device configured as described above operates as follows when the temperature inside the tread of the tire is lower than a predetermined threshold value and no abnormality occurs in the tire.

When the vehicle starts traveling, the signal rotor 11 rotates according to the rotation speed of the wheels. When the signal rotor 11 rotates, the signal rotor 11 and the yoke 17
The air gap between and changes periodically, and therefore the magnetic flux penetrating the yoke 17 also changes periodically according to the rotation speed of the signal rotor 11. As a result, the pickup coil 18 generates a wheel speed signal according to the rotation speed of the signal rotor 11 and supplies it to the input processing circuit 20.

On the other hand, the temperature sensor 13 detects the temperature of the tire tread and supplies the detection result to the current generating circuit 14. The current generation circuit 14 determines whether the temperature of the tread detected by the temperature sensor 13 is higher than a predetermined threshold value. However, since the tire is not abnormal here and the tread temperature is not higher than the predetermined threshold value, No current is generated.

The input processing circuit 20 removes noise from the wheel speed signal, or shapes the noise-removed wheel speed signal into a pulse shape, and, for example, as shown in FIG. 2, a pulse width corresponding to the wheel speed. A wheel speed signal having the following is supplied to the microcomputer 30. The pulse width of the wheel speed signal becomes shorter as the rotational angular velocity of the wheel becomes faster,
The longer the wheel rotation speed, the longer it becomes.

The microcomputer 30 detects the wheel speed based on the pulse width of the wheel speed signal from the input processing circuit 20 and also checks whether the wheel speed signal contains a periodic abnormal signal. Then, as shown in FIG. 2, the microcomputer 30 determines that there is no abnormality in the tire when the wheel speed signal does not include a periodic abnormality signal.

Here, a tire burst phenomenon is one of the tire abnormalities. The tire burst phenomenon is caused by a decrease in tire air pressure, and can be easily predicted by measuring the tire air pressure. However, in the running state immediately before the tire burst, the temperature inside the tire becomes extremely high and the air pressure increases as the temperature rises. Therefore, in reality, it is difficult to predict the tire burst phenomenon from only the tire pressure.

On the other hand, the temperature inside the tread of the tire is largely related to the tire burst phenomenon, and it is possible to predict the tire berth and give an alarm by observing the temperature rise in the tread portion.

Therefore, when the temperature inside the tread of the tire exceeds a predetermined threshold and an abnormality occurs in the tire, the tire abnormality detecting device operates as follows.

When the vehicle is traveling, as described above, the pickup coil 18 generates a wheel speed signal corresponding to the rotation speed of the signal rotor 11 and supplies it to the input processing circuit 20. On the other hand, the current generation circuit 14 supplies a current to the rotor coil 12 when the temperature of the tread detected by the temperature sensor 13 becomes equal to or higher than a predetermined threshold value. When the current is supplied from the current generation circuit 14, the rotor coil 12 generates a magnetic flux in a direction penetrating the inside thereof.

Therefore, the magnetic flux penetrating the yoke 17 is different when the yoke 17 faces the rotor coil 12 and when the yoke 17 does not face the rotor coil 12. Therefore, when the yoke 17 faces the rotor coil 12, the pickup coil 18 has the yoke 17
Generates a wheel speed signal having a different waveform (a wheel speed signal including an abnormal signal), as compared with a case where the wheel speed signal does not face the rotor coil 12. The wheel speed signal including the abnormal signal is generated each time the yoke 17 faces the rotor coil 12, that is, each time the wheel makes one rotation.

The pickup coil 18 supplies the wheel speed signal thus generated to the input processing circuit 20. The input processing circuit 20 performs noise removal, waveform shaping, and the like on the wheel speed signal, and, for example, as shown in FIG. 3, a wheel speed signal having a pulse width W corresponding to the wheel speed and a pulse width W1 (≠ W). And a periodic wheel speed signal having

Then, the microcomputer 30 checks whether the wheel speed signal supplied from the input processing circuit 20 includes a periodic abnormal signal, and when it is determined that the abnormal signal is included, It is determined that the tire is abnormal. For example, the microcomputer 30 calculates the deviation of each pulse width of the wheel speed signal, determines that the pulse of the wheel speed signal includes an abnormal signal when the deviation is larger than a predetermined value, and the LCD 40 indicates a tire abnormality. Give an alarm. As a result, the driver can recognize that the tire is abnormal.

As described above, the tire abnormality detecting device includes a radio device or a slip ring by including a periodic abnormality signal in the wheel speed signal when the temperature inside the tread of the tire exceeds a predetermined threshold value. It is possible to detect a tire abnormality with an inexpensive system without providing the above.
Further, since the tire abnormality detecting device does not give any vibration to the wheel movement, it is possible to detect the tire abnormality without affecting the running state of the vehicle.

In this embodiment, the rotor coil 1
2 has been described as being wound around one tooth of the signal rotor 11, but the present invention is not limited to the above-mentioned form as long as the wheel speed signal can include a periodic abnormal signal. . For example, the rotor coil 12 may be wound around two or more teeth of the signal rotor 11 that are equally spaced from each other.

[Second Embodiment] Next, a second embodiment of the present invention will be described. The same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 4, the tire abnormality detecting apparatus according to the second embodiment includes a semiconductor type wheel speed sensor (active sensor) 60 for outputting a wheel speed signal corresponding to the angular velocity of rotation of the wheel, and a wheel. An input processing circuit 20 for performing a predetermined signal processing on the speed signal, a microcomputer 30 for judging a tire abnormality based on the wheel speed signal, and an LCD 40 for displaying an alarm when the tire is abnormal are provided.

The semiconductor wheel speed sensor 60 is composed of a magnetic rotor 61 that rotates with the wheel and a magnetic semiconductor element 68 that generates a wheel speed signal according to the rotation of the magnetic rotor 61. The magnetic rotor 61 is formed in a circular shape,
On the outer peripheral portion of the magnetic rotor 61, an N-pole permanent magnet 62N is provided.
(Hereinafter referred to as "magnet 62N") and S-pole permanent magnet 62
S (hereinafter referred to as “magnet 62S”) are alternately arranged. A rotor coil 63 is provided on the side of one magnet 62S.
Is provided. The magnetic rotor 61 is adapted to rotate together with the wheels.

Further, a temperature sensor 64 for detecting the temperature of the tread is embedded in the tread of the tire.
A current generation circuit 65 for applying a current to the rotor coil 63 based on the temperature of the tread is attached to the wheel of the tire. Here, the current generation circuit 65 does not generate a current when the temperature of the tread detected by the temperature sensor 64 is lower than a predetermined threshold value, and generates a current when the temperature of the tread becomes equal to or higher than a predetermined threshold value.

The magnetic semiconductor element 68 is fixed in the radial direction of the magnetic rotor 61 so as to face the outer periphery of the magnetic rotor 61 with an appropriate air gap. The magnetic semiconductor element 68 is, for example, an MR (Magnetic Resistanc).
e) It is composed of an element and a Hall element, detects a change in the magnetic field caused by the rotation of the magnetic rotor 61, generates a wheel speed signal having a pulse width according to the change in the magnetic field, and supplies it to the input processing circuit 20. In the present embodiment, the magnetic semiconductor element 68 has four magnetic semiconductor elements when the magnetic rotor 61 makes one rotation.
It shall generate eight pulsed wheel speed signals.

The input processing circuit 20 subjects the wheel speed signal generated by the semiconductor wheel speed sensor 60 to noise removal processing, waveform shaping processing, etc., and the microcomputer 3
Supply to 0.

The microcomputer 30 detects the wheel speed on the basis of the pulse width of the wheel speed signal from the input processing circuit 20, determines whether there is a tire abnormality, and displays an alarm on the LCD 40 when there is a tire abnormality. I do.

By the way, the magnets 62N and 62S formed on the outer peripheral portion of the magnetic rotor 61 are arranged with some variations. Therefore, the microcomputer 3
With 0, if the wheel speed is simply calculated based on the pulse width of the wheel speed signal, it will be affected by the arrangement of the magnets 62N and 62S. As a result, the signal cycle Δt of the wheel speed signal fluctuates according to the rotation speed of the magnetic rotor 61. The variation occurring in the wheel speed can be compensated by correcting the pulse interval according to the rotation angle of the magnetic rotor 61 by using the method of uniformity learning.

Therefore, the microcomputer 30 specifically executes the processing of step ST1 and the subsequent steps shown in FIG. 5 to correct the pulse intervals of the wheel speed signal by a correction coefficient ω _{n, m} (n: Rotation detection number (1 to 48), m:
The rotation speed of the magnetic rotor 61) is calculated, and when the correction coefficient ω _{n, m} changes significantly, it is determined that the wheel speed signal includes an abnormality signal, and the tire abnormality can be detected.

In step 1, the microcomputer 3
0 calculates equation (1) in order to calculate the average value S of the periods of 48 wheel speed signals during one rotation of the magnetic rotor 61, and shifts to step ST2.

[0054]

[Equation 1]

In step 2, the microcomputer 3
0 is the signal period (ω _{n, m-1} · Δ) using the correction coefficient ω _{n, m-1} of the previous time (one rotation before) with respect to the average value S of the pulse signal period
In order to obtain the deviation ratio Δt _h of t), the equation (2) is calculated, and the process proceeds to step ST3.

[0056]

[Equation 2]

In step 3, the microcomputer 3
0, multiplied by the correction sensitivity coefficient k for adjusting the convergence rate of the correction coefficient omega _{n, m} in Delta] t _h, by adjusting the degree of influence of the correction coefficient omega _{n, m} of Delta] t _h with respect to one pulse input, corrected Coefficient ω
Update _{n and m} . Specifically, the equation (3) is calculated, and the process proceeds to step ST4.

[0058]

[Equation 3]

For example, if the value of the correction sensitivity coefficient k is decreased _, the convergence speed of the correction coefficient ω _{n, m} becomes slower, but the fluctuation amount of the correction coefficient ω _{n, m} due to random speed fluctuations such as road surface vibration is decreased. be able to. As a result, when the wheel speed is measured by the semiconductor wheel speed sensor 60 _, it is possible to eliminate the influence of random fluctuation of the wheel speed due to road surface vibration on the correction coefficient ω _{n, m} .

At step ST4, the microcomputer
Is the period Δt of the wheel speed signal. _nTo correct the
After calculating (4), the process proceeds to step ST5.

[0061]

[Equation 4]

In step ST5, the microcomputer 30 determines the tire abnormality using the correction coefficient ω _{n, m} obtained in step ST3. Microcomputer 3
0 is, for example, one of the correction coefficients ω _{n, m} is the other correction coefficient ω
_When the correction coefficient ω _{n, m} is greater than a predetermined value by a predetermined value, or when one of the changes over time of the correction coefficient ω _{n, m} is greater than a predetermined value over the other changes by time. It is determined that there is a tire abnormality, and the LCD 40 is caused to display an alarm indicating that there is a tire abnormality.

As described above, the tire abnormality detecting apparatus detects the tire abnormality by using the correction coefficient ω _{n, m} for correcting the signal period Δt _n in the uniformity learning method. Therefore, the tire abnormality detection device is
By using the correction coefficient ω _{n, m} updated for each pulse of the wheel speed signal, the tire condition can be sequentially observed, and the tire abnormality can be detected early.

Further, since the tire abnormality detecting device detects the tire abnormality by using the correction coefficient ω _{n, m} for correcting each pulse interval of the wheel speed signal, the tire abnormality detecting device can detect the tire abnormality. It is not necessary to use a special device, and the cost can be suppressed.

In the present embodiment, the case where the tire abnormality is detected by using the correction coefficient ω _{n, m} in uniformity learning has been described as an example. However, the present invention is the above correction coefficient ω _{n, m.} Is not limited to the use of. That is, another coefficient may be used as long as it is a coefficient for correcting the pulse interval of the wheel speed signal.

Further, the number of rotor coils 63 provided on the magnetic rotor 61 is not limited to one, and a plurality of rotor coils 63 may be provided. At this time, each rotor coil 63 may be installed along the inner side of the outer peripheral portion of the magnetic rotor 61 at equal intervals with other adjacent rotor coils 63.

[0067]

The wheel speed signal generator according to the present invention comprises:
When an abnormality occurs in the tire, an abnormality signal is output to generate a wheel speed signal corresponding to the rotation speed of the wheel and a wheel speed signal affected by the abnormality signal output by the abnormality signal output means. By doing so, it is possible to generate the wheel speed signal for detecting the occurrence of the tire abnormality without affecting the running state of the vehicle and without increasing the cost.

The method for outputting an abnormal signal according to the present invention superimposes an abnormal signal generated when an abnormality occurs on a tire on a wheel speed signal, and outputs a wheel speed signal on which the abnormal signal is superposed to output a vehicle signal. It is possible to output the abnormality signal for detecting the occurrence of the abnormality of the tire without affecting the running state of the vehicle and without increasing the cost.

In the tire abnormality detecting apparatus according to the present invention, when the wheel speed signal generated by the wheel speed signal generating apparatus includes the wheel speed signal affected by the abnormality signal, the tire abnormality is detected. By detecting the presence, it is possible to easily detect the tire abnormality without affecting the running state of the vehicle and without increasing the cost.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a tire abnormality detection device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a wheel speed signal when there is no abnormality in a tire.

FIG. 3 is a diagram showing a wheel speed signal when an abnormality occurs in a tire.

FIG. 4 is a diagram showing a configuration of a tire abnormality detection device according to a second embodiment of the present invention.

FIG. 5 is a flowchart showing a processing procedure of a microcomputer provided in the tire abnormality detection device.

[Explanation of symbols]

10 Wheel speed sensor 11 Signal rotor 12,63 rotor coil 13,64 Temperature sensor 14,65 Current generation circuit 15 pickups 16 permanent magnet 17 York 18 pickup coil 30 microcomputer 60 Semiconductor wheel speed sensor

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) G01P 3/487 G01P 3/487 L 3/488 3/488 FL

Claims (5)

[Claims] 1. An abnormality signal output means for outputting an abnormality signal when an abnormality occurs in a tire, a wheel speed signal according to a rotation speed of a wheel, and an abnormality signal output by the abnormality signal output means. A signal generating means for generating a wheel speed signal affected by, and a wheel speed signal generating device comprising: 2. A signal rotor having a plurality of teeth made of a magnetic material formed along the outer periphery of a rotating body, the signal rotor rotating according to the rotation of a wheel, and the signal rotor corresponding to a specific tooth of the signal rotor. A rotor coil provided, an abnormal signal output unit that outputs an abnormal signal to the rotor coil when an abnormality occurs in a tire, and a wheel in accordance with a change in magnetic flux generated between teeth formed on the signal rotor. A wheel speed signal generation device comprising: a pickup that generates a speed signal and a wheel speed signal that is affected by an abnormal signal flowing through the rotor coil when facing the rotor coil. 3. A signal rotor having a plurality of magnets arranged adjacent to each other along the outer circumference of the rotating body so that the polarities are different from each other, the signal rotor rotating according to the rotation of the wheel, and the signal rotor corresponding to a specific magnet. A wheel speed signal is provided in accordance with a change in magnetic flux generated between a rotor coil provided, an abnormal signal output unit that outputs an abnormal signal to the rotor coil when an abnormality occurs in a tire, and a magnet of the signal rotor. A wheel speed signal generator comprising: a pickup that generates a wheel speed signal that is generated and is affected by an abnormal signal that flows through the rotor coil when facing the specific magnet. 4. An abnormality characterized in that an abnormality signal is generated when an abnormality occurs in a tire, the generated abnormality signal is superimposed on a wheel speed signal, and the wheel speed signal on which the abnormality signal is superimposed is output. Signal output method. 5. The wheel speed signal generator according to claim 1, and a wheel speed affected by the abnormal signal in a wheel speed signal generated by the wheel speed signal generator. A tire abnormality detecting device comprising: a tire abnormality detecting means for detecting a tire abnormality when a signal is included.