JPH07117423A - Pressure detecting device and running condition detecting system using same - Google Patents

Abstract

PURPOSE:To provide a pressure detecting device capable of constantly detecting the air pressure of a tire attached to a vehicle and a running condition detecting system using the pressure detecting device. CONSTITUTION:Each of the tires of a vehicle (bicycle) is provided with a pressure detection means (pressure sensor) 7 for constantly detecting air pressure while the vehicle is stopped or running, and a calculation means (CPU) 24 for calculating data related to the distribution of loads according to pressure detection signals P1, P2 detected by each pressure sensor 7 is provided, so the operator can determine whether or not he is in the proper riding position according to the data on the distribution of loads.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure detecting device for detecting the air pressure of a tire mounted on a running body such as a bicycle or an automobile, and a running state detecting device using the pressure detecting device.

[0002]

2. Description of the Related Art Conventionally, in running bodies such as bicycles and automobiles, a so-called pressure gauge is used to detect the air pressure of a tube type or tubeless type tire that injects air to maintain a predetermined circumferential length. Is common.

This pressure gauge detects the air pressure of the tire by pressing a pressure measuring portion against a valve (air hole) of the tire of the running body in a stopped state and reading the value of a gauge that moves up and down according to the pressure. It was a thing.

[0004]

However, in such a pressure detecting device, it is only possible to detect the air pressure of the tire when the traveling body is stopped, and at the same time, the air pressures of a plurality of tires are detected during traveling. It was difficult.

For this reason, for example, it was not possible to obtain the load distribution that changes during traveling of a running body such as a bicycle or an automobile based on the tire air pressure.

Further, in a running condition detecting device which detects the rotation of the tire and calculates various data such as running speed, running distance, acceleration, etc., the tire air pressure changes (especially for a bicycle or the like, the condition of the road surface changes). Therefore, it is not possible to calculate accurate data because the tire circumference also changes when the air pressure is changed intentionally.

The present invention has been made in order to solve the above problems, and provides a pressure detecting device capable of detecting the air pressure of a tire mounted on a running body while the vehicle is running or when the vehicle is stopped. A main object of the present invention is to provide a running state detection device capable of calculating data regarding load distribution of each tire using a pressure detection device and calculating a tire circumference corresponding to air pressure.

[0008]

According to a first aspect of the present invention, there is provided a pressure detecting device for injecting air to detect an air pressure of a tire mounted on a traveling body having a predetermined circumference. And a pressure sensor provided on a valve of a tire of the traveling body to detect air pressure of the tire while the traveling body is running or stopped, and wirelessly transmits air pressure data output from the pressure sensor. It is configured to include a transmitter and a receiver that receives the transmitted air pressure data.

A traveling state detecting device according to a second aspect of the present invention is a traveling state detecting device for detecting a traveling state of a traveling body using the pressure detecting device, wherein the pressure sensor of the pressure detecting device is , A configuration provided with a load distribution data calculation means provided on each of a plurality of tires mounted on the traveling body and calculating data regarding load distribution of the traveling body based on air pressure data detected by each pressure sensor. There is.

According to a third aspect of the present invention, there is provided a traveling state detecting device for detecting a rotation of a tire of a traveling body, rotation detecting means, and a traveling speed and a traveling distance of the traveling body based on the detected rotation of the tire. In a traveling state detecting device having a calculating means for calculating data regarding various traveling states such as acceleration, a tire valve for detecting rotation by the rotation detecting means is provided with a pressure sensor of the pressure detecting means,
Data relating to various running states by the calculating means based on the tire circumference obtained by the circumference calculating means, the circumference calculating means for calculating the circumference of the tire based on the air pressure data detected by the pressure detecting means. Is configured to calculate.

[0011]

In the pressure detecting device according to the first aspect, for example, the tire air pressure data obtained by the pressure sensor is wirelessly transmitted from the transmitter and is received by the receiver, so that the
Alternatively, it is possible to constantly detect the air pressure of the tire of the running body that is stopped.

According to another aspect of the present invention, there is provided a traveling state detecting device using the pressure detecting device, wherein the pressure sensor is provided on each of a plurality of tires mounted on a traveling body. It is possible to obtain data regarding load distribution applied to the traveling body.

For example, when the traveling body is a bicycle, the load distribution data is displayed on a display such as a cycle computer, and the driver can refer to the data to judge whether the riding posture is proper or not.

When the traveling body is an automobile, it is possible to input the load distribution data to a drive system control device or the like and variably control the torque distribution or the like applied to each tire based on the data.

According to another aspect of the present invention, there is provided a traveling state detecting device using the pressure detecting device, wherein the rotation detecting means detects the rotation of the tire of the traveling body, and based on the rotation detection signal, the calculating means performs the traveling speed and traveling When calculating data relating to various running states such as distance and acceleration, the circumference of the tire corresponding to the air pressure is calculated by the circumference calculating means based on the air pressure data detected by the pressure sensor, and the circumference is calculated. The data is used to calculate data relating to various running states. Therefore, accurate information on the running state can be obtained.

[0016]

Embodiments of the pressure detecting device according to the present invention and a traveling state detecting device using the same will be described below with reference to the drawings.

FIG. 1 is a side view showing the appearance of a bicycle equipped with a pressure detecting device according to the present invention.

First, the structure will be described.

In FIG. 1, a front wheel 2 of a bicycle 1 has a tube 5a (FIG. 3) attached to a rim 4 supported by a spoke 3.
The tire 5 which stores (see FIG. 3) is mounted and configured.

A valve 6 of a tube 5a is projected from the peripheral surface of the rim 4, and a pressure sensor 7 as a pressure detecting means is fitted to the valve 6 as shown in FIGS. 2 and 3. .

The pressure sensor 7 uses, for example, a piezoelectric element (lead zirconate titanate, etc.), is formed in a shape that substantially covers the valve 6, and a detection unit (not shown) is provided at the tip of the valve 6. When engaged, the pressure detection signal P1 corresponding to the air pressure of the tire 5 is output.

The pressure sensor 7 has a pressure detection signal P1.
Is connected to a transmitter 9 which will be described later, and the cable 8 is wound around the spokes 3 so as not to be entangled when the tire 5 rotates.

A transmitter 9 is attached to the hub 10 of the front wheel 2.

The transmitter 9 wirelessly transmits the pressure detection signal P1 sent from the pressure sensor 7 to a receiver 21 (see FIG. 5) of the cycle computer 20 described later.

A speed detecting magnet 14 is attached to a predetermined position of the spoke 3, and the front fork 12 portion of the vehicle body 11 of the bicycle 1 is provided in the vicinity of the rotation track of the speed detecting magnet 14. The speed detection transmitter 13 is fixed.

The speed detecting transmitter 13 detects the magnetism of the speed detecting magnet 14 and wirelessly transmits the rotation detection signal P3 of the front wheel 2 to the transmitter 9.

A cycle computer 20 is detachably attached to the handle 11a of the vehicle body 11.

The cycle computer 20 is a running state detecting device for calculating and displaying data relating to various running states such as running speed and running distance of the bicycle 1, and as shown in FIG. 4, a liquid crystal display is provided on the upper surface side thereof. A display unit 22 configured by and a key input unit 23 are provided.

The key input section 23 is a data input key 23a for inputting data such as the weight of the bicycle 1, the weight of the driver, the circumference of the tire 5, etc., a start key 23b for starting / stopping processing such as calculation, and an end. The key 23c, an adjustment switch 23d for normalizing the detection values of the pressure sensors 7, 33 in the unloaded state, and the like.

A pressure sensor 33 is fitted to the valve 32 of the tire 31 on the rear wheel 30, as with the front wheel 2.

Then, the cable 3 of the pressure sensor 33.
4 is connected to a transmitter 35 attached to the hub of the rear wheel 30.

As a result, the pressure detection signal P2 output from the pressure sensor 33 is transmitted by the transmitter 35 to the receiver 21 of the cycle computer 20.

FIG. 5 is a block diagram showing the circuit configuration of the cycle computer 20.

The cycle computer 20 includes, for example, a CPU 24 for performing various arithmetic processes and the like, and the key input unit 2 for inputting various data is provided on the input side thereof.
3, an oscillation circuit 25 that generates a clock pulse, a power supply circuit 26 that supplies power to each device, and the like are connected.

A display unit 22 composed of a liquid crystal display or the like is connected to the output side of the CPU 24.

The CPU 24 has a ROM (not shown), and the ROM has, for example, a program for calculation and
A table for data correction, which maps the correlation between the air pressure of the front wheels 2 and the circumferential length of the tire 5, is stored.

The CPU 24 is connected to the receiver 21 including an electromagnetic induction coil (not shown).

In the receiver 21, the pressure detection signal P1 of the pressure sensor 7 of the front wheel 2 wirelessly transmitted from the transmitter 9 and the pressure sensor 33 of the rear wheel 30 wirelessly transmitted from the transmitter 35.
The pressure detection signals P2 are received, and the rotation detection signal P3 transmitted from the speed detection transmitter 13 is received.

The radio waves of the signals P1, P2 and P3 are
Since different frequency bands are used, there is no interference.

Each signal received by the receiver 21 is C
Input to the PU 24, the CPU 24 performs an operation based on a program stored in the ROM and various parameters stored in the RAM (not shown), and calculates the load distribution based on the pressure detection signals P1 and P2, for example. Alternatively, based on the rotation detection signal P3, data regarding various traveling states such as traveling speed and traveling distance are calculated.

The display screen of the display section 22 in this embodiment is constructed as shown in FIG. 6, for example.

In the figure, 22a and 22b are concentric graphs showing the distribution of the load applied to the front wheels 2 and the rear wheels 30 by the size of the display area, and 22c is a graphic display section that schematically shows the inclination of the current riding posture. Reference numeral 22d is a correction direction display portion that indicates the correction direction of the riding posture, 22e is a load distribution display portion that indicates the load distribution applied to the front wheels 2 and the rear wheels 30 as a percentage, and 22f is a speed display portion that indicates the speed.

Next, the operation of this embodiment having the above configuration will be described with reference to FIG.

FIG. 7 is a flowchart showing the processing procedure of the cycle computer 20 according to this embodiment.

First, when the driver starts traveling,
The data input key 23a of the key input unit 23 of the cycle computer 20 is operated to input numerical data such as the weight of the bicycle 1, the weight of the user, and the circumference of the tire 5 (step S1).

These numerical data are stored in the RA of the CPU 24.
It is stored in a predetermined storage area of M.

Next, in step S2, the process waits until the adjustment switch 23d is pressed. If the adjustment switch 23d is pressed, the process proceeds to step S3, in which the pressure sensors 7 of the front wheel 2 and the rear wheel 30 are detected. 33 is normalized in the unloaded state.

In the normalization mentioned here, appropriate arithmetic processing is performed on the air pressure data of the front wheels or the air pressure data of the rear wheels so that the air pressure ratio of the tires of the front and rear wheels in an unloaded state becomes 50:50. Thus, the load distribution can be obtained from the air pressure ratio.

That is, when the driver gets on the vehicle, the load distribution applied to the front wheels 2 and the rear wheels 30 is determined by the tires 5, 3 for the front and rear wheels.
Since there is a proportional relationship with the air pressure of 1, the ratio of the air pressures of the front and rear wheels in the unloaded state in which the driver has not yet boarded is 50:50.
By assuming that the load distribution of the front and rear wheels in this unloaded state is 50% and 50%, the load distribution is calculated from the change in the air pressure ratio of the front and rear wheels when the driver gets on the vehicle. It becomes possible.

Therefore, before the load distribution is detected, the air pressures of the tires 5 and 31 of the front and rear wheels in the unloaded state are detected by the pressure sensors 7 and 33, and normalization processing is performed so that the ratio becomes 50:50. Done.

An example of such normalization processing will be briefly described. First, the pressure detection signal P1 in the no-load state output from each of the pressure sensors 7 and 33 (for example, 1.02k).
gf / cm ² ), P2 (for example, 1.05 kgf / c
m ² ) is temporarily stored in the RAM of the CPU 24 as air pressure data.

Next, the air pressure data (1.05 kgf / cm ² ) of the rear wheel 30 is set to "1.02 / 1.0.
By multiplying the air pressure data of the front wheels 2 (1.02 kgf / cm ² ) with the air pressure data of the rear wheels 30, the air pressure ratio of the front and rear wheels becomes 50:50.

As a result, the ratio of the air pressure of the front wheels 2 and the air pressure of the rear wheels 30 can be treated as a load distribution ratio.

In the above example, the case where the air pressure data of the rear wheels is subjected to the arithmetic processing to be normalized is described.
Not limited to this, for example, in the air pressure data of the front wheels, "1.0
It is also possible to perform the normalization processing by multiplying the value of "5 / 1.02".

After performing the above normalization,
In step S4, the load distribution of the front wheels 2 and the rear wheels 30 on the display unit 22 of the cycle computer 20 is 50%, 5
A display indicating that it is 0% is displayed.

That is, in the concentric graphs 22a and 22b of the display unit 22 shown in FIG. 6, for example, when the third circle from the inside represents 50%, up to the third circle of both graphs is displayed. Further, F (front wheel) → 50% and R (rear wheel) → 50% are displayed on the display unit 22e showing the load distribution.

Then, the process proceeds to step S5 and waits until the driver gets on the bicycle 1 and presses the start key 23a. If the start key 23a is pressed, the process proceeds to the next step S6.

In step S6, the pressure sensors 7 and 33 are
Based on the pressure detection signals P1 and P2 corresponding to the air pressure sequentially detected by, the ratio of the normalized front wheel air pressure to the rear wheel air pressure is calculated, and the ratio is displayed on the display unit 22 as data regarding load distribution. .

That is, in a state where the rider is riding on the bicycle 1 and starts traveling, for example, the tire 5 of the front wheel 2 has an air pressure of 1.50 kgf / cm ² , and the tire 31 of the rear wheel 30.
When the air pressure of the vehicle is 1.10 kgf / cm ² , the air pressure of the rear wheel 30 is “1.02 / 1.05” as described above.
By multiplying and normalizing, the front wheel 2 has about 58%,
It can be seen that a load distribution of about 42% is applied to the rear wheel 30.

In this case, the front wheel 2 side is overloaded, and the riding posture shown in FIG.
In the graphic display unit 22c which is divided into stages (25a to 25d), the character of 25a showing a state of leaning forward is displayed, and 22a, 22b and 22e are displayed.
F → 58% and R → 42% are displayed on the display section of.

For example, when the tire 5 of the front wheel 2 has an air pressure of 1.10 kgf / cm ² and the tire 31 of the rear wheel 30 has an air pressure of 1.60 kgf / cm ² , the rear wheel 3
By multiplying the air pressure of 0 by "1.02 / 1.05" and normalizing it, about 42% for the front wheel 2 and about 58 for the rear wheel 30.
It can be seen that the weight distribution is%.

In this case, since the rear wheel 30 side is overloaded, the character 25d showing the state of leaning backward too much is displayed in the graphic display section 22c, and 22a, 22b and 22e are displayed. F on the display
→ 42%, R → 58% are displayed.

With these displays, the driver can accurately know the current riding posture and load distribution, and can drive efficiently.

Further, the process proceeds to step S7, and the CPU 2
4 determines whether the driver should lean forward or backward in order to correct the riding posture based on the air pressure ratio calculated in step S6.
The direction is indicated by the arrow (26
a, 26b).

That is, according to the above example, when the load distribution of the front wheels is 58% and the load distribution of the rear wheels is 42%, it is determined that the riding posture should be corrected rearward, and the arrow 26b is displayed.
In addition, the load distribution of the front wheels is 42% and the load distribution of the rear wheels is 58%.
In the case of%, the arrow 26a is displayed indicating that the riding posture should be corrected forward.

As a result, the driver can accurately and swiftly know whether the riding posture should be corrected to the front or the rear in order to travel more efficiently.

Next, in step S8, the pneumatic pressure of the tire 5 of the front wheel 2 is referred to with reference to the table in which the correlation data between the pneumatic pressure of the tire and the circumferential length stored in the ROM of the CPU 24 is mapped as described above. The correction data of the circumferential length of the tire 5 corresponding to is read. Then, in step S9, the speed of the bicycle 1 is calculated based on the tire circumference correction data, and the calculated speed is displayed on the display unit 22.

That is, the rotation detection signal P3 transmitted from the speed detecting transmitter 13 and received by the receiver 21.
Is counted by the CPU 24, and the count cycle is measured.

Then, "(3600 / count cycle) x
According to the formula of "corrected circumference", the speed of the bicycle 1 (km
/ H) is calculated and displayed on the speed display unit 22f.

As described above, the running condition detecting apparatus according to the present embodiment is arranged such that even if the tire pressure is changed intentionally according to the road surface condition or the like and the tire circumference is changed, the air pressure is changed. By using the correction data corresponding to, it is possible to always calculate an accurate traveling speed.

It is also possible to calculate the traveling distance or to calculate the acceleration by differentiating the speed value according to the formula of "corrected circumference length × count number of pulse signals". Alternatively, the traveling distance and the acceleration may be displayed together with the speed. Next, in step S10, it is determined whether or not the end key 23c for ending the detection of the traveling state is pressed, and if not pressed, the processes of steps S6 to S10 are repeatedly executed.

In this way, by repeating the above-mentioned running state detection processing, the running state such as the load distribution of the bicycle 1, the riding posture of the driver, the riding posture correction direction, and the corrected speed can be accurately obtained in real time. Can be displayed on the display unit 22.

On the other hand, in step S10, when the end key 23c is pressed, a series of processing is ended.

Thus, according to this embodiment, the bicycle 1
When traveling, the load distribution applied to the front wheels 2 and the rear wheels 30 can be calculated and displayed based on the air pressures of the tires 5 and 31.

Further, since the riding posture of the driver is estimated and displayed based on the load distribution and the correction direction of the riding posture is indicated, the driver refers to these displays and By correcting the riding posture, it becomes possible to drive efficiently.

Furthermore, when calculating the speed of the bicycle 1,
The correction data of the circumferential length corresponding to the air pressure of the tire 5 of the front wheel 2 is read out, and the calculation is performed based on the circumferential length corrected based on the correction data. It is possible to obtain various speed information.

In the present embodiment, a bicycle has been described as an example of the running body, but the present invention is not limited to this and can be applied to a motorcycle or an automobile.

That is, for example, a pressure sensor is attached to each of the four tires of an automobile, the air pressure of each tire is detected in real time, the load distribution is calculated and displayed, and the data is input to a drive system controller or the like. However, it is also possible to variably control the torque distribution applied to each tire so that the vehicle can travel efficiently.

In the present embodiment, the case where the load distribution, the riding posture, the speed, etc. are displayed on the display unit 22 has been described, but the present invention is not limited to this.
The data can be stored in the AM and transferred to the host computer after the traveling is completed, or can be printed out and used as data for analyzing the traveling state and the riding posture.

In addition, the cycle computer 2 of this embodiment
0 indicates an example configured to constantly detect the air pressure of the tire 5 of the front wheel 2 of the running bicycle 1 when calculating the traveling speed, and to read and calculate the corresponding correction data every time the calculation is performed. However, the present invention is not limited to this, and it is possible to detect the air pressure of the tire 5 of the front wheel 2 when the bicycle 1 is stopped and correct the input data based on the air pressure to calculate the speed and the like. .

An example of the configuration will be described below with reference to FIGS. 8 to 10.

In FIG. 8, reference numeral 40 is a cycle computer detachably attached to the handle 11a of the bicycle 1 shown in FIG.

The cycle computer 40 calculates and displays the speed and the traveling distance on the basis of the rotation detection signal P3 transmitted from the speed detecting transmitter 13, as in the above-described embodiment. Functions for calculating and displaying load distribution, riding posture, etc. are omitted.

On the upper surface of the cycle computer 40, there are provided a display section 41 composed of a liquid crystal display or the like, and a key input section 42 for inputting various data. The key input section 42 is a vehicle weight of the bicycle 1. Or the circumference of the tire 5,
It is composed of a numerical value input key 42a for inputting the weight of the driver, a correction key 42b for correcting the input data, and the like.

Further, above the left side surface of the cycle computer 40, a pressure sensor 43 having an air pressure detecting portion 43a pressed against the valve 6 of the tire 5 is arranged. As shown in FIG. 9, the cycle computer 40 is
A pressure sensor 43 that outputs a pressure detection signal P4 for the front wheels 2 and a rotation detection signal P3 that is wirelessly transmitted from the speed detection transmitter 13 are received on the input side of a CPU 44 that performs arithmetic processing of traveling speed and traveling distance. A receiver 45, the key input unit 42 for inputting various data, an oscillation circuit 46 for generating a clock pulse, and a power supply circuit 47 for supplying power to each device are respectively connected, and an output side is provided with a liquid crystal display or the like. The display unit 41 and the like are connected to each other.

The CPU 44 is a ROM (not shown).
The ROM stores a calculation program, a correction value having a correlation with the air pressure of the front wheels 2 and the circumferential length of the tire 5, and the like.

Next, a method of using and operation of the cycle computer 40 having the above-mentioned configuration will be described.

First, the numerical value input key 42 of the key input unit 42
By operating a, the vehicle weight of the bicycle 1, the circumference of the tire 5 of the front wheel 2 at a reference air pressure (for example, 1.20 kgf / cm ² ), the weight of the driver, and the like are input.

Next, as shown in FIG. 10, when the air pressure detecting portion 43a of the pressure sensor 43 is pressed against the valve 6 of the tire 5 of the front wheel 2, the pressure sensor 43 causes the pressure detecting signal P4.
Is output to the CPU 44.

Then, the correction key 43b of the key input section 42
When is pressed, the correction value corresponding to the pressure detection signal P4 is read from the ROM.

The CPU 44 multiplies the read correction value by the circumferential length of the tire 5 at the reference air pressure to correct the circumferential length corresponding to the detected air pressure.

From this state, the cycle computer 40
When the bicycle computer 1 is mounted on the steering wheel 11a of the bicycle 1 and starts traveling, the cycle computer 40 receives the rotation detection signal P3 transmitted from the speed detection transmitter 13 by the receiver 45 and counts the signal. Measure the period of the signal.

Then, the CPU 44 calculates the traveling speed and the traveling distance based on the corrected circumference of the tire 5,
The respective calculation results are displayed on the display unit 41.

As described above, in this configuration example, the air pressure of the tire 5 of the front wheel 2 in the stopped state of the bicycle 1 is detected, and the value of the input circumferential length of the tire 5 is corrected according to the air pressure. The traveling speed and the traveling distance can be calculated and displayed substantially accurately with a simple configuration.

The pressure sensor 43 displays the detected air pressure on the display unit 41 so as to be used as a normal pressure gauge, or is used as a barometer for detecting and displaying atmospheric pressure. Is also possible.

[0096]

According to the present invention, the tire air pressure data obtained by the pressure detecting means is wirelessly transmitted from the transmitter and received by the receiver, so that the tire air pressure of the traveling body which is running or stopped can be obtained. Has the effect that it can be detected at all times.

Further, in the running condition detecting apparatus using the pressure detecting apparatus according to the present invention, when the pressure detecting means is provided for each of the plurality of tires mounted on the running body, it is based on the air pressure data of each tire. Thus, it is possible to obtain data regarding load distribution applied to the traveling body.

Further, when the rotation detecting means detects the rotation of the tire of the traveling body and the calculating means calculates the data relating to various traveling states such as traveling speed, traveling distance and acceleration based on the rotation detection signal, Based on the air pressure data detected by the pressure detecting means, the circumference of the tire corresponding to the air pressure is obtained by the circumference calculating means, and when calculating data relating to various running states using this circumference data, Accurate information such as mileage, speed, and acceleration can be obtained.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a pressure detecting device according to the present invention is applied to a bicycle.

FIG. 2 is a schematic side view showing a mounted state of a pressure sensor which constitutes a part of the pressure detection device according to the present invention.

FIG. 3 is a vertical cross-sectional view showing a mounted state of a pressure sensor which constitutes a part of the pressure detection device according to the present invention.

FIG. 4 is a top view showing the external appearance of a cycle computer that constitutes a part of the pressure detection device according to the present invention.

FIG. 5 is a block diagram showing a circuit configuration of a cycle computer which constitutes a part of a pressure detecting device according to the present invention.

FIG. 6 is a plan view showing a configuration example of a display unit of the cycle computer.

FIG. 7 is a flowchart showing the operation of this embodiment.

FIG. 8 is a top view showing an appearance of a cycle computer according to another embodiment.

FIG. 9 is a block diagram showing a circuit configuration of a cycle computer.

FIG. 10 is a side view showing a usage state of the cycle computer.

[Explanation of reference numerals] 1 bicycle 2 front wheel 3 spoke 5 tire 5a tube 6 valve 7 pressure sensor (pressure detecting means) 8 cable 9 transmitter 13 speed detecting transmitter 20 cycle computer (running state detecting device) 21 receiver 22 display Part 23 Key input part 24 CPU (load distribution data calculating means, calculating means, circumferential length calculating means) 30 Rear wheel 31 Tire 32 Valve 33 Pressure sensor (pressure detecting means) 35 Transmitter 40 Cycle computer 41 Display part 42 Key input part 43 pressure sensor 43a air pressure detection unit P1, P2, P4 pressure detection signal (air pressure data) P3 rotation detection signal

Claims (3)

[Claims] 1. A pressure detection device for injecting air to detect an air pressure of a tire mounted on a traveling body, which has a predetermined circumferential length, the pressure detecting device being provided in a valve of the tire of the traveling body, A pressure sensor that detects the air pressure of the tire while the running body is running or stopped, a transmitter that wirelessly transmits the air pressure data output from the pressure sensor, and a receiver that receives the transmitted air pressure data. A pressure detecting device characterized by being provided. 2. A traveling state detecting device for detecting a traveling state of a traveling body using the pressure detecting device, wherein a pressure sensor of the pressure detecting device is provided for each of a plurality of tires mounted on the traveling body. A traveling state detecting device using a pressure detecting device, comprising: load distribution data calculating means for calculating data regarding load distribution of a traveling body based on air pressure data detected by each pressure detecting means. 3. Rotation detecting means for detecting the rotation of the tire of the running body, and computing means for calculating data relating to various running states such as running speed, running distance and acceleration of the running body based on the detected rotation of the tire. In a traveling state detecting device having a, a pressure sensor is provided on a valve of a tire for detecting rotation by the rotation detecting means, and a circumference calculating means for calculating a circumference of the tire based on air pressure data detected by the pressure sensor. A running condition detecting device using a pressure detecting device, characterized in that the calculating device calculates data relating to various running conditions based on the circumference of the tire obtained by the circumference calculating device.