JPH10297228A - Tire pneumatic pressure alarm device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire pneumatic pressure alarm device which can give an alarm automatically when abnormality occurs in pneumatic pressure in a tire. SOLUTION: A vehicle position is detected based on a GPS(Global Positioning System) signal obtained from the outside of a vehicle by a position detection part 20, and running distance of the vehicle is calculated based on the vehicle position by a CPU 31. Moreover, a radius of rotation of a wheel in an ordinary condition is memorized in a memory part 32, and the number of rotation of individual wheels in a predetermined running distance is detected to calculate pneumatic pressure of a tire mounted on each wheel based on the radius of rotation of the wheel, the running distance, and the number of rotation of each wheel. For example, the running distance calculated from the radius of rotation of the wheel in the ordinary condition and the number of rotation is compared with the radius of rotation of the wheel obtained from actual running distance to estimate pneumatic pressure of the tire. Furthermore, the calculated pneumatic pressure is compared with the reference pneumatic pressure by the CPU 31 to give an alarm when pneumatic pressure of the tire is abnormal based on the results of the comparison.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire pressure alarm device for automatically notifying an abnormal air pressure of a tire mounted on a vehicle.

[0002]

2. Description of the Related Art Conventionally, one of the points to be careful in order to drive safely in a vehicle is to set an appropriate air pressure in a tire of the vehicle. For example, when the air pressure in the tire decreases, the occurrence rate of puncture increases, and at the time of high-speed running, a burst occurs, which causes a serious accident.

[0003] For this reason, it is necessary for the driver to regularly check the tire air pressure. At the time of checking the air pressure in the tire, measurement was performed for each tire by pressing a pressure measuring device against a valve provided on a rim of a wheel.

[0004] However, as described above, it is very troublesome to measure the tire air pressure for each tire, and it is very difficult for a female driver who has increased rapidly in recent years. For this reason, the driver tends to neglect to check the tire pressure even though it is necessary to check the tire pressure on a regular basis, and the number of accidents caused by abnormal tire pressure tends to increase.

In order to reduce the occurrence of such accidents,
A device has been developed that automatically detects tire pressure by using a so-called "indirect type" tire pressure detection method of inputting data from an ABS speed sensor and estimating tire pressure.

[0006] The method of detecting the tire air pressure used in this device can be roughly divided into two methods: (a) a method of obtaining a change (deflection) in the rolling radius of the tire due to a decrease in air pressure from the rotational angular velocity of the wheel; Many methods have been disclosed by automobile manufacturers, for example, for performing FFT processing on input signals and calculating from changes in the natural frequency of tires.

On the other hand, as a method of using a reference data from outside of the vehicle system, Matsushita warns of tire wear based on a global positioning system (GPS) position data (although not air pressure detection) and a running distance. It is disclosed by the electric appliance industry (Japanese Unexamined Patent Publication No. 7-164830).

[0008]

However, each of the former methods (a) and (b) is a self-contained system in which data and data are input and processing is determined in a dedicated system. Is also made in the vehicle system, so it is not easy to increase the judgment accuracy.

In the latter method using a reference data from outside the vehicle system, the change in tire radius due to abrasion causes
The change in the amount of deflection of the tire due to changes in various environments is larger,
There was a problem that it was not practical.

An object of the present invention is to provide a tire pressure alarm device capable of automatically issuing an alarm when an abnormality occurs in the tire air pressure in view of the above problems.

[0011]

According to the present invention, there is provided a vehicle position detecting means for detecting a vehicle position based on a specific signal obtained from the outside of the vehicle. Based on the vehicle position detected by the detecting means, a traveling distance calculating means for calculating a traveling distance of the vehicle, a turning radius storage means for storing a turning radius of the wheel in a normal state, and an individual wheel at a predetermined traveling distance. Rotation speed detection means for detecting the rotation speed, air pressure calculation means for calculating the air pressure of a tire mounted on each wheel based on the running distance and the rotation speed of each wheel, and a comparison result between the air pressure and a reference air pressure And an alarming means for issuing an alarm when the air pressure of the tire is abnormal.

According to the tire pressure warning device, the vehicle position is detected by the vehicle position detecting means on the basis of a specific signal obtained from outside the vehicle, and the traveling distance of the vehicle is detected by the traveling distance calculating means on the basis of the vehicle position. Is calculated. Further, the turning radius of the wheel in the normal state is stored in the turning radius storage means. Further, the number of revolutions of each wheel at a predetermined traveling distance is detected by the revolution number detecting means, and is mounted on each wheel by the air pressure calculating means based on the turning radius and traveling distance of the wheel and the number of revolutions of each wheel. The tire pressure is calculated. Here, for example, the traveling distance calculated from the turning radius and the number of rotations of the wheels in the normal state,
The turning radius of the wheel obtained from the actual running distance is compared, and the tire pressure is estimated. The alarm means compares the air pressure with the reference air pressure, and based on the result, issues an alarm when the air pressure of the tire is abnormal.

According to a second aspect of the present invention, in the tire pressure warning device according to the first aspect, the vehicle position detecting means includes:
A tire pressure warning device having a global positioning system (GPS) receiver and detecting a vehicle position based on a signal received by the receiver is proposed.

According to the tire pressure warning device, an accurate vehicle position is detected based on a signal received by a global positioning system (GPS) receiver, and an accurate actual traveling distance is calculated from the vehicle position.

According to a third aspect of the present invention, in the tire pressure warning device according to the first aspect, the vehicle position detecting means includes:
The present invention proposes a tire pressure warning device having beacon receiving means for receiving a beacon signal radiated from a beacon device installed on a road, and detecting a vehicle position based on the beacon signal.

According to the tire pressure warning device, an accurate vehicle position is detected based on a beacon signal radiated from an optical beacon device or a radio beacon device installed on a road, and an accurate actual vehicle position is detected from the vehicle position. The mileage is calculated.

According to a fourth aspect of the present invention, in the tire pressure warning device according to the first aspect, the vehicle position detecting means includes:
A tire pressure warning device having marker magnetic detection means for detecting magnetism generated by a magnetic marker buried in a road and detecting a vehicle position from a detection result of the marker magnetism is proposed.

According to the tire pressure warning device, an accurate vehicle position is detected from marker magnetism emitted by a magnetic marker embedded in a road, and an accurate actual traveling distance is calculated from the vehicle position.

According to a fifth aspect of the present invention, in the tire pressure warning device according to any one of the first to fourth aspects, the rotation number detecting means outputs a pulse signal of one or more integer times per one rotation of the wheel. The present invention proposes a tire pressure alarm device that has a pulse generation device that generates a signal and detects the rotation speed of each wheel based on the pulse signal.

According to the tire pressure warning device, the accurate rotation speed of each wheel is detected based on a pulse signal from a pulse generator which generates an integer one or more pulse signals for one rotation of the wheel. You.

According to a sixth aspect of the present invention, in the tire pressure warning device according to any one of the first to fifth aspects, a vehicle running speed detecting means for detecting a running speed of the vehicle is provided, and the air pressure calculating means is provided. A tire pressure warning device including a correction unit that uses a detection result of a vehicle running speed as a correction data when calculating an air pressure is proposed.

According to the tire pressure warning device, when the air pressure is calculated by the air pressure calculation means, the correction based on the vehicle traveling speed is performed by the correction means. For example, as the running speed increases, the radius of the tire increases due to the centrifugal force. Therefore, the tire pressure is estimated in consideration of the increase in the radius.

According to a seventh aspect of the present invention, in the tire pressure alarm device according to any one of the first to sixth aspects, a vehicle acceleration / deceleration detecting means for detecting an acceleration / deceleration of the vehicle is provided, and the air pressure calculating means comprises: A tire pressure warning device including a correction unit that uses a detection result of a vehicle acceleration / deceleration as a correction data when calculating an air pressure is proposed.

According to the tire air pressure warning device, when the air pressure is calculated by the air pressure calculating means, a correction based on the acceleration / deceleration of the vehicle is performed by the correcting means. For example, when the vehicle is accelerated, the radius of the tire increases due to the centrifugal force as the speed increases, and the tire pressure is estimated in consideration of the increase in the radius.

According to an eighth aspect of the present invention, in the tire pressure alarm device according to any one of the first to seventh aspects, a steering wheel operating angle detecting means for detecting a steering wheel operating angle of the vehicle is provided, and the air pressure calculating means includes: The present invention proposes a tire pressure warning device including a correction unit that uses the steering wheel operation angle as a correction data when calculating the air pressure.

According to the tire air pressure warning device, when the air pressure is calculated by the air pressure calculating means, correction is performed by the correcting means based on the steering wheel operating angle. For example, since the load applied to the inner wheel and the outer wheel becomes different as the steering wheel operation angle increases, the tire pressure is estimated in consideration of the fact that the radius of the outer wheel increases and the radius of the inner wheel decreases.

According to a ninth aspect of the present invention, in the tire pressure alarm device according to any one of the first to eighth aspects, a vehicle loaded state detecting means for detecting a loaded state of the vehicle is provided, and the air pressure calculating means is provided. The present invention proposes a tire pressure warning device including a correction unit that uses a loaded state of a vehicle as a correction data when calculating an air pressure.

According to the tire pressure warning device, when the air pressure is calculated by the air pressure calculation means, correction is performed by the correction means based on the loaded state of the vehicle. For example, since the radius of the tire decreases due to the weight as the loaded amount of the vehicle becomes larger than the normal state, the tire pressure is estimated in consideration of the decrease in the radius.

According to a tenth aspect of the present invention, in the tire pressure alarm device according to any one of the first to ninth aspects, a vehicle traveling time detecting means for detecting a traveling time of the vehicle is provided, and the air pressure calculating means is provided. The present invention proposes a tire pressure alarm device including a correction unit that uses a vehicle traveling time as a correction data when calculating an air pressure.

According to the tire pressure warning device, when the air pressure is calculated by the air pressure calculation means, the correction means makes a correction based on the vehicle traveling time. For example, as the running time becomes longer, the air temperature in the tire increases and the air in the tire expands, and the radius of the tire increases. Therefore, the tire pressure is estimated in consideration of the increase in the radius.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing a first embodiment of the present invention. In the figure, 10 is a sensor unit, 2
0 is a position detection unit, 30 is a central processing unit, 40 is an interface unit, 50 is an operation unit, and 60 is a display unit.

The sensor unit 10 includes a wheel speed sensor 11, a gyro sensor 12, an ABS / TRC controller 13, an outside air temperature sensor 14, and a suspension stroke sensor 1.
5 and a handle operation angle sensor 16.

The wheel speed sensor 11 comprises a plurality of sensors provided on each wheel. Each sensor generates a pulse each time the wheel makes one rotation, whereby the rotation speed of each wheel is detected. The information is sent to the central processing unit 30 via the interface unit 40.

The gyro sensor 12 detects an acceleration or deceleration state of the vehicle, a roll, or the like, and outputs the detected signal to the central processing unit 30 via the interface unit 40 as an electric signal.

The ABS / TRC controller 13 outputs whether or not the antilock brake system (ABS) is in operation and whether or not the traction controller (TRC) is in operation by an electric signal. To the central processing unit 30 via

The outside air temperature sensor 14 detects the outside air temperature, converts it into an electric signal, and sends it to the central processing unit 30 via the interface unit 40.

The suspension stroke sensor 15 is
It is composed of a plurality of sensors provided on each wheel, and converts the expansion / contraction state of the suspension for each wheel into an electric signal, which is output to the central processing unit 30 via the interface unit 40.

The steering angle sensor 16 detects the steering angle of the steering wheel, converts it into an electric signal, and sends it to the central processing unit 30 via the interface unit 40.

The position detecting section 20 includes a global positioning system (hereinafter referred to as GPS) receiver 21 and a G
It is composed of a PS antenna 22 and detects a vehicle position based on a signal received from a satellite, and sends the detection result to the central processing unit 30.

The central processing unit 30 includes a well-known CPU 31 and a storage unit 32. The CPU 31 receives signals from the sensor unit 10, the position detection unit 20, and the operation unit 50 via the interface unit 40, and , And outputs a display signal to the display unit 60.

Further, the CPU 31 calculates the tire air pressure based on each signal from the sensor section 10 and the position information from the position detecting section 20, and displays this on the display section 60 when the air pressure is abnormal. And give an alarm.

The storage unit 32 stores the radius of the tire via the operation unit 50 and the CPU 31 when the tire is mounted on the vehicle, and also stores various data tables in advance. That is, the following first to seventh data tables are stored in the storage unit 32 in advance.

(1) As a data table relating to the wheel speed sensor 11, a first table showing the relationship between the rotation speed of the wheel and the variation of the tire rotation radius due to the centrifugal force generated accordingly.
(2) As a data table relating to the gyro sensor 12 and the suspension stroke sensor 15, the relationship between the acceleration / deceleration state and the degree of roll of the vehicle and the change in the tire radius caused by the weight applied to each tire caused by this. A second data table representing (3)
A third data table representing the relationship between the outside air temperature and the change in the tire turning radius due to the expansion and contraction of the air in the tire caused by the outside air temperature sensor 14; (4) the handle operation angle sensor 16 A fourth data table showing the relationship between the steering wheel operating angle and the change in the tire turning radius due to the change in the left and right loads that accompanies this, and (5) the running time and the accompanying data table. Fifth data table showing the relationship of the change of the tire turning radius due to the rise of the air temperature in the tire, (6) sixth data table showing the relationship between the turning radius of the tire and the air pressure in the tire, (7) Tire Air pressure value, this air pressure value is normal state,
A seventh data table indicating the relationship between the alarm states is stored in the storage unit 32 in advance.

Next, a processing operation for generating a tire air pressure alarm in the first embodiment having the above-described configuration will be described with reference to flowcharts shown in FIGS. When this device is mounted on a vehicle for the first time or when a tire of a vehicle is replaced, the radius of the tire is stored in the storage unit 32 from the operation unit 50.
To be stored.

When the apparatus is driven, the CPU 31
2 is initialized (S1), and it is determined whether or not the vehicle has started running based on the signal from the wheel speed sensor 11 (S2).
The timer of the timer incorporated in U31 is started to measure the running time (S3).

Thereafter, the CPU 31 takes in the position data of the vehicle from the position detecting section 20 (S4), and judges whether or not the position data has been input (S5).

If the result of this determination is that no position data has been input, the process proceeds to step S4, and if position data has been input, the input position data is stored in the storage unit 32 as first position data. (S6).

Next, the CPU 31 resets the wheel speed sensor 11 to set the measured value of the number of revolutions to 0 (S7), and determines whether the ABS / TRC controller 13 is operating (S8). ).

As a result of this determination, when the ABS / TRC controller 13 is in the operating state, it is not possible to make a normal tire pressure alarm determination, so the process shifts to the process of S4 and the process is repeated. When the ABS / TRC controller 13 is not in the operating state, the position data of the vehicle is fetched from the position detector 20 (S9).
It is determined whether or not the position data has been input (S10).

If the result of this determination is that the position data has not been input, the flow proceeds to the processing of S9, and if the position data has been input, the input position data is stored in the storage unit 32 as second position data. (S11).

Next, the CPU 31 calculates the travel distance of the vehicle based on the first and second position data stored in the storage unit 32 (S12), and reads the travel time of the vehicle from the time measured by the timer. (S13).

Further, the CPU 31 controls the wheel speed sensor 11
The rotation speed of each wheel is read (S14), and the rotation radius of each wheel is calculated based on the rotation speed and the obtained travel distance (S15).

Next, the CPU 31 sets the gyro sensor 1
2. Detection signals are input from each of the outside air temperature sensor 14, the suspension stroke sensor 15, and the steering wheel operation angle sensor 16, and the acceleration / deceleration state and the rolling state of the vehicle, the outside air temperature, the expansion and contraction of the suspension of each company forest are obtained from these signals. The state and the operating angle of the steering wheel are detected, and the turning radius of each wheel is corrected based on the first to fifth data tables stored in the storage unit 32 in advance (S1).
6).

Thereafter, the CPU 31 estimates the air pressure of each wheel based on the turning radius of each wheel obtained in the processing of S16 and the sixth data table stored in the storage unit 32 (S17).

Next, the CPU 31 compares the estimated air pressure of each wheel with the seventh data table stored in the storage unit 32 to determine whether the air pressure of each tire is normal (S18). ).

As a result of this determination, when the air pressure of each tire is normal, the display unit 60 displays that the air pressure is normal for each tire (S19), and when the air pressure of each tire requires caution or is abnormal. Displays that effect on the display unit 60 and issues an alarm (S20).

Next, the CPU 31 determines whether or not the running of the vehicle has stopped (S21). If the running of the vehicle is still in the running state, the CPU 31 shifts to the process of S4. The process proceeds to S1.

As described above, according to the present embodiment, vehicle position information, which is a parameter of the mileage determination reference, is taken in from the outside of the vehicle by a signal received by a global positioning system (GPS) receiver, and based on this, the tire pressure is determined. Since an alarm is issued, the determination accuracy can be improved as compared with the conventional one.

Further, when calculating the tire pressure, each tire is corrected based on the data from each sensor, and the tire pressure is estimated in consideration of the increase or decrease of the wheel radius. Accuracy can be further improved.

Next, a second embodiment of the present invention will be described. FIG. 4 is a configuration diagram showing a second embodiment of the present invention. In the figure, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof is omitted. Also,
The difference between the first embodiment and the second embodiment resides in that the position detecting section 20 is constituted by a beacon receiver 23, a radio beacon antenna 24, and an optical beacon sensing section 25.

Thus, it is possible to detect the position information emitted from the beacon transmitters arranged at predetermined intervals on the road and calculate the traveling distance of the vehicle with high accuracy.

Accordingly, in the second embodiment, the accuracy of the tire pressure warning can be greatly improved as in the first embodiment.

Next, a third embodiment of the present invention will be described. FIG. 5 is a configuration diagram showing a third embodiment of the present invention. In the figure, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof is omitted. Also,
The difference between the first embodiment and the third embodiment is that the position detector 20 is provided with a magnetic marker reader 26 and a magnetic sensor 2.
7 is comprised.

As a result, the position of the vehicle can be determined by detecting signals emitted from the magnetic markers arranged at predetermined intervals on the road surface, and the traveling distance of the vehicle can be calculated with high accuracy. .

Therefore, also in the third embodiment, the accuracy of alarm generation of the tire air pressure can be greatly improved as in the first embodiment.

The above-described first to third embodiments are merely examples, and the present invention is not limited to these embodiments.
For example, the sensors used for correcting the tire turning radius are not necessarily limited to those described above, and the correction may be performed based on the detection results of any of these or other types of sensors.

[0067]

As described above, according to the first aspect of the present invention, vehicle position information, which is a parameter of a mileage determination criterion, is fetched from outside the vehicle, and a warning regarding tire pressure is issued based on the information. Therefore, the determination accuracy can be improved as compared with the conventional one.

According to the second aspect of the present invention, in addition to the above-described effects, an accurate vehicle position is detected based on a signal received by a global positioning system (GPS) receiver, and an accurate actual traveling is detected from the vehicle position. Since the distance is calculated, it is possible to further improve the accuracy of the tire pressure alarm generation.

According to the third aspect, in addition to the above effects, an accurate vehicle position is detected based on a beacon signal radiated from an optical beacon device or a radio beacon device installed on a road. Since the accurate actual traveling distance is calculated from the vehicle position, the accuracy of the tire pressure alarm generation can be further improved.

According to the fourth aspect, in addition to the above effects, an accurate vehicle position is detected from the marker magnetism emitted by the magnetic marker embedded in the road, and an accurate actual traveling distance is determined from the vehicle position. Since it is calculated, it is possible to further improve the accuracy of the tire pressure warning generation.

According to the fifth aspect of the present invention, in addition to the above-described effects, each of the wheels is generated based on a pulse signal from a pulse generator that generates an integer one or more pulse signals per one rotation of the wheel. Since the accurate number of revolutions is detected, the actual traveling distance of the vehicle and the radius of gyration of the wheels can be calculated with high accuracy, and the accuracy of generating a tire pressure alarm can be further improved.

According to the sixth aspect of the invention, in addition to the above effects, when the air pressure is calculated by the air pressure calculating means, a correction based on the vehicle running speed is performed by the correcting means, so that the wheels associated with the increase and decrease of the running speed are obtained. Since the tire pressure is estimated in consideration of the radius increase / decrease amount, the accuracy of the tire pressure warning can be further improved.

According to the seventh aspect, in addition to the above-described effects, when the air pressure is calculated by the air pressure calculating means, a correction based on the acceleration / deceleration of the vehicle is performed by the correcting means, and the correction is performed in accordance with the increase or decrease of the traveling speed. Since the tire pressure is estimated in consideration of the amount of increase or decrease in the wheel radius, the accuracy of the tire pressure warning can be further improved.

According to the present invention, in addition to the above effects, when the air pressure is calculated by the air pressure calculating means, a correction based on the steering wheel operation angle is performed by the correcting means,
Since the tire pressure is estimated in consideration of the weight difference between the inner wheel and the outer wheel caused by the increase or decrease of the steering wheel operation angle, the accuracy of the tire pressure warning can be further improved.

According to the ninth aspect, in addition to the above effects, when the air pressure is calculated by the air pressure calculating means, a correction based on the loaded state of the vehicle is made by the correcting means, and the correction is performed according to the loaded amount of the vehicle. Since the tire pressure is estimated in consideration of the amount of increase / decrease of the wheel radius due to the increase / decrease of the load, the accuracy of the tire pressure alarm generation can be further improved.

According to the tenth aspect, in addition to the above effects, when the air pressure is calculated by the air pressure calculating means, a correction based on the vehicle travel time is performed by the correction means, and the tire temperature is increased or decreased according to the travel time. Since the tire pressure is estimated in consideration of the amount of increase or decrease of the tire radius accompanying the above, the accuracy of the tire pressure warning can be further improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a flowchart showing an alarm generation process in the first embodiment of the present invention.

FIG. 3 is a flowchart showing an alarm generation process in the first embodiment of the present invention.

FIG. 4 is a configuration diagram showing a second embodiment of the present invention.

FIG. 5 is a configuration diagram showing a third embodiment of the present invention.

[Explanation of symbols]

10: sensor unit, 11: wheel speed sensor, 12: gyro sensor, 13: ABS / TRC controller, 14: outside temperature sensor, 15: suspension stroke sensor,
16: handle operation angle sensor, 20: position detection unit, 2
DESCRIPTION OF SYMBOLS 1 ... GPS receiver, 22 ... GPS antenna, 23 ... Beacon receiver, 24 ... Radio beacon antenna, 25 ... Optical beacon sensing part, 26 ... Magnetic marker reader, 27 ...
Magnetic sensor, 30 central processing unit, 31 CPU, 32
Storage unit, 40: Interface unit, 50: Operation unit, 60
... Display unit.

[Procedure amendment]

[Submission date] June 11, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

In order to reduce the occurrence of such accidents,
A device has been developed that automatically detects tire pressure by using a so-called "indirect" tire pressure detection method of inputting data from an ABS speed sensor and estimating tire pressure.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006] The method of detecting the tire air pressure used in this device can be roughly divided into two methods: (a) a method of obtaining a change (deflection) in the rolling radius of the tire due to a decrease in air pressure from the rotational angular velocity of the wheel; ) and FFT processing the input signal, the method and the automobile manufacturers to calculate the natural frequency of the change in the tire
And many others.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

On the other hand, as a method of using reference data from outside the vehicle system, a device that warns of tire wear based on global positioning system (GPS) position data (although not air pressure detection) and traveling distance has been developed by Matsushita Electric Industrial Co., Ltd. (Japanese Unexamined Patent Publication No. Hei 7-164830).

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

However, both of the former methods (a) and (b) described above require data in a vehicle system.
It is a self-contained system that performs data input and processing determination, and the parameters that serve as the reference for determination are also created in the vehicle system, so it is not easy to increase the determination accuracy.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

In the latter method using reference data from outside the vehicle system, a change in tire radius due to wear is considered.
The change in the amount of deflection of the tire due to changes in various environments is larger,
There was a problem that it was not practical.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

According to a sixth aspect of the present invention, in the tire pressure warning device according to any one of the first to fifth aspects, a vehicle running speed detecting means for detecting a running speed of the vehicle is provided, and the air pressure calculating means is provided. The present invention proposes a tire pressure warning device including a correction unit that uses a detection result of a vehicle traveling speed as correction data when calculating a pressure.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0023

[Correction method] Change

[Correction contents]

According to a seventh aspect of the present invention, in the tire pressure alarm device according to any one of the first to sixth aspects, a vehicle acceleration / deceleration detecting means for detecting an acceleration / deceleration of the vehicle is provided, and the air pressure calculating means comprises: A tire pressure warning device including a correction unit that uses a detection result of vehicle acceleration / deceleration as correction data in calculating air pressure is proposed.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0025

[Correction method] Change

[Correction contents]

According to an eighth aspect of the present invention, in the tire pressure alarm device according to any one of the first to seventh aspects, a steering wheel operating angle detecting means for detecting a steering wheel operating angle of the vehicle is provided, and the air pressure calculating means includes: We propose a tire pressure warning device including a correction unit that uses the steering wheel operation angle as correction data when calculating the air pressure.

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0027

[Correction method] Change

[Correction contents]

According to a ninth aspect of the present invention, in the tire pressure alarm device according to any one of the first to eighth aspects, a vehicle loaded state detecting means for detecting a loaded state of the vehicle is provided, and the air pressure calculating means is provided. The present invention proposes a tire pressure warning device including a correction unit that uses a loaded state of a vehicle as correction data when calculating a pressure.

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0029

[Correction method] Change

[Correction contents]

According to a tenth aspect of the present invention, in the tire pressure alarm device according to any one of the first to ninth aspects, a vehicle traveling time detecting means for detecting a traveling time of the vehicle is provided, and the air pressure calculating means is provided. A tire pressure warning device including a correction unit that uses vehicle running time as correction data when calculating air pressure is proposed.

Claims (10)

[Claims] 1. A vehicle position detecting means for detecting a vehicle position based on a specific signal obtained from the outside of a vehicle, and a travel calculating a travel distance of the vehicle based on the vehicle position detected by the vehicle position detecting means. Distance calculating means, turning radius storing means for storing a turning radius of a wheel in a normal state, turning speed detecting means for detecting a turning speed of each wheel at a predetermined running distance, and a running speed and a turning speed of each wheel. Air pressure calculating means for calculating the air pressure of the tire mounted on each wheel, based on a comparison result of the air pressure and the reference air pressure, alarm means for issuing an alarm when the air pressure of the tire is abnormal A tire pressure warning device comprising: 2. The tire pressure according to claim 1, wherein the vehicle position detecting means has a global positioning system (GPS) receiver, and detects a vehicle position based on a signal received by the receiver. Alarm device. 3. The vehicle position detecting means includes beacon receiving means for receiving a beacon signal radiated from a beacon device installed on a road, and detecting a vehicle position based on the beacon signal. The tire pressure warning device according to claim 1, wherein 4. The vehicle position detecting means has marker magnetic detecting means for detecting magnetism emitted by a magnetic marker embedded in a road, and detects a vehicle position from a detection result of the marker magnetism. The tire pressure warning device according to claim 1. 5. The rotation number detecting means has a pulse generator for generating a pulse signal of one or more integer times per one rotation of a wheel, and detects a rotation number of each wheel based on the pulse signal. The tire pressure warning device according to any one of claims 1 to 4, wherein: 6. A vehicle running speed detecting means for detecting a running speed of a vehicle is provided, and said air pressure calculating means includes a correcting means for using a detection result of said vehicle running speed as a correction data for calculating an air pressure. The tire pressure warning device according to any one of claims 1 to 5, further comprising: 7. A vehicle acceleration / deceleration detecting means for detecting acceleration / deceleration of a vehicle is provided, and said air pressure calculating means uses a detection result of said vehicle acceleration / deceleration as a correction data when calculating air pressure. The tire pressure warning device according to any one of claims 1 to 6, further comprising: 8. A steering wheel operating angle detecting means for detecting a steering wheel operating angle of the vehicle, and said air pressure calculating means includes a correcting means for using said steering wheel operating angle as a correction data when calculating the air pressure. The tire pressure warning device according to claim 1, wherein: 9. A vehicle loaded state detecting means for detecting a loaded state of a vehicle is provided, and said air pressure calculating means is provided with a correcting means for using the loaded state of said vehicle as a correction data when calculating an air pressure. The tire pressure warning device according to any one of claims 1 to 8, wherein: 10. A vehicle traveling time detecting means for detecting a traveling time of a vehicle is provided, and said air pressure calculating means includes a correcting means for using said vehicle traveling time as a correction data when calculating an air pressure. The tire pressure warning device according to any one of claims 1 to 9, wherein: