JP2001055026A - Tire air pressure alarm device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a false alarm by automatically interrupting notification and releasing the interruption, in an alarm device notifying anomalies in tire air pressure and a sensor device on the basis of tire air pressure data transmitted from the sensor device equipped in a tire. SOLUTION: An alarm device body 20 assembled in a vehicular body entering the data of tire air pressure and tire temperature from a sensor device equipped in a tire at specified intervals, in a receiving circuit 24. A micro computer portion 22 detects attachment or detachment of the sensor device to the tire on the basis of the fact that transmission data cannot be received, and tire air pressure or tire temperature changed according to vehicular traveling, thereby automatically interrupting or releasing the interruption of notifying anomalies in the tire air pressure and the sensor device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to information and a sensor relating to tire pressure based on a signal from a sensor device which is mounted on a tire of a vehicle and detects a tire pressure and transmits a signal representing the detected tire pressure. The present invention relates to a tire pressure alarm device that informs a driver of a device abnormality.

[0002]

2. Description of the Related Art Conventionally, this type of apparatus is disclosed in, for example,
As shown in Japanese Patent Publication No. 1-78446, a signal is received from a sensor device which is mounted on a tire of a vehicle and detects a tire pressure and transmits a signal representing the detected tire pressure. The information about the tire pressure of each tire is notified to the driver based on the signal, and the abnormality of the sensor device is notified to the driver on the condition that no signal is received from the sensor device.

[0003]

However, in the above conventional apparatus, all tires of the vehicle are changed from summer tires to studless tires, and vice versa. Stored tires in the garage or replace only some of the tires and store them in the trunk of the vehicle, etc. When the sensor device is not mounted, if the driver forgets to cancel the information regarding the tire pressure and the notification function regarding the abnormality of the sensor device, even if the tire pressure of the replaced tire is normal, the abnormal information of the tire pressure is transmitted to the driver. There is a problem that the notification is made or the driver is notified of the abnormality of the sensor device. Conversely, even if a tire without a sensor device is replaced with a tire with a sensor device, after the replacement, forgetting to restart the information about the tire pressure and the notification function of the abnormality of the sensor device, There is also a problem that the notification function cannot be used.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to cancel and restart a notification function for notifying a driver of information on tire pressure and an abnormality of a sensor device when replacing a tire. It is an object of the present invention to provide a tire pressure warning device that solves the above-mentioned problem caused by forgetting the release and resumption by automatically controlling the release and resumption even if the driver forgets the switching.

In order to achieve the above object, a structural feature of the present invention is to detect whether or not the sensor device is mounted on a tire, and to detect when the sensor device is not mounted on a tire. In addition, an interruption means for interrupting the notification of information on tire pressure to the driver by the air pressure information notification means is provided.

According to this, when the sensor device is not mounted on the tire, the notification of the information about the tire pressure to the driver by the pressure information notifying means is automatically interrupted. Even if the user forgets to cancel the notification function of the information about the tire pressure, it is possible to prevent the erroneous information about the tire pressure from being notified to the driver.

Another structural feature of the present invention is that when the notification of the tire pressure information to the driver by the air pressure information notifying means is interrupted by the interrupting means,
Detects whether the sensor device is mounted on the tire,
When the sensor device detects that the sensor device is mounted on the tire, an interruption canceling unit for canceling the interruption of the notification of the tire pressure to the driver by the air pressure information notifying unit is provided.

According to this, even if the notification of the information about the tire pressure to the driver by the air pressure information notifying means is interrupted as described above, the state in which the sensor device is mounted on the tire due to tire replacement or the like. Then, the suspension is automatically released, and the notification of the information on the tire pressure to the driver by the air pressure information notifying means is restarted. Therefore, even if the driver forgets to release the suspension,
The information about the tire pressure is automatically notified to the driver by the air pressure information notifying means.

Another structural feature of the present invention is to detect whether or not the sensor device is mounted on a tire, and to detect at least a sensor abnormality when detecting that the sensor device is not mounted on the tire. An interruption means is provided for interrupting the notification of the abnormality of the sensor device to the driver by the notification means.

[0010] According to this, when the sensor device is not mounted on the tire, the notification of the abnormality of the sensor device to the driver by the sensor abnormality notification means is automatically interrupted, so that the driver is notified of the abnormality. Even if the user forgets to cancel the notification function, it is possible to prevent the driver from being erroneously notified of the abnormality of the sensor device.

Another structural feature of the present invention is that the sensor device is mounted on the tire in a state where the notification of the abnormality of the sensor device to the driver by the sensor abnormality notification device is interrupted by the interruption device. The presence or absence of the sensor device is detected, and when the sensor device is detected to be mounted on the tire, at least the interruption cancellation means for canceling the interruption of the abnormality notification to the driver by the sensor abnormality notification means is provided. .

According to this, even when the notification of the abnormality of the sensor device to the driver by the sensor abnormality notification means is interrupted as described above, the state in which the sensor device is mounted on the tire due to tire replacement or the like. Then, the interruption is automatically released, and the notification of the abnormality of the sensor device to the driver by the sensor abnormality notification means is resumed. Therefore, even if the driver forgets to cancel the interruption, the driver is automatically notified of the sensor device abnormality by the sensor abnormality notification means.

[0013] In the above-mentioned structural feature of the present invention, the interruption means may be provided on the condition that the receiving means does not receive signals from all the sensor devices mounted on the respective tires. Can be configured to detect that is not mounted on the tire. Further, the interrupting means may detect that the sensor device is not mounted on the tire, on condition that the physical quantity representing the state of the tire and changing with the running of the vehicle does not change during running of the vehicle. It can also be configured. in this case,
As the physical quantity, a tire air pressure, a tire temperature, and a difference between the tire temperature and the outside air temperature can be adopted.

[0014] In the above-mentioned feature of the present invention, the interruption canceling means may be arranged so that the receiving means does not receive signals from all the sensor devices mounted on the respective tires. The sensor device may be configured to detect that the sensor device is mounted on a tire on condition that the means has changed to a state of receiving signals from all the sensor devices mounted on each tire. Further, the suspension canceling means may detect that the sensor device is mounted on the tire on condition that the physical quantity representing the state of the tire and changing with the running of the vehicle is changing during running of the vehicle. Can also be configured. Also in this case, as the physical quantity, a tire air pressure, a tire temperature, and a difference between the tire temperature and the outside air temperature can be used.

According to these, it is possible to easily detect whether or not the tire pressure sensor is mounted on the tire.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the tire pressure warning device according to the present invention will be described below. This tire pressure warning device has the number of tires of a vehicle ("4" in the present embodiment).
And an alarm device main body 20 incorporated in the vehicle body.

The sensor device 10 is mounted on each tire by screwing a housing (not shown) to a wheel rim, and the tire on which the sensor device 10 is mounted is mounted on a vehicle. The sensor device 10 houses an electric circuit device shown in a schematic block diagram in FIG. 1 in a housing. The electric circuit device
A tire pressure sensor 11, a tire temperature sensor 12, and an operation switch 13 are provided. Tire pressure sensor 11
Detects the air pressure in the tire, that is, the tire pressure Pt, and outputs a detection signal indicating the tire pressure Pt.
The tire temperature sensor 12 detects the temperature of the tire, that is, the tire temperature Tt, and outputs a detection signal indicating the tire temperature Tt. The operation switch 13 is operated by a worker, a driver, or the like.

Each of these sensors 11 to 13 is connected to a transmission circuit 14. The transmission circuit 14 includes the sensor device 1
I storing the self-identification number data ID given for each 0
It has a D memory 14a and a timer circuit 14b for measuring the passage of a predetermined time. Then, the timer circuit 14b
Every time a predetermined time is measured, the transmission circuit 14 determines the tire pressure Pt detected by the tire pressure sensor 11 and the tire temperature Tt detected by the tire temperature sensor 12.
To form transmission data by adding the self identification number data ID to the transmission data, modulate the transmission data for transmission, and
To send over. When the operation switch 13 is operated, the transmission data including the self identification number data ID is modulated and transmitted. The sensor device 10 has a built-in battery 16 and always operates as described above.

The alarm device body 20 includes a CPU 22a, a ROM 22b, and a RAM 22 connected to a bus 21, respectively.
c, a microcomputer section 22 including a timer circuit 22d and a clock circuit 22e. CPU 22a
Executes a program shown by the flowcharts of FIGS. 3 to 10 and a program (not shown) to determine abnormal air pressure of each tire, abnormality of each sensor device 10 itself, and notify the driver. The ROM 22b stores the program, constants required for the program, and the like.
RAM 22c stores variables necessary for executing the program,
And the transmission data transmitted from each sensor device 10 and the like. A part of the RAM 22c is constituted by a nonvolatile area for storing data even after an unillustrated ignition switch is turned off, and the other part is constituted by a volatile area. Timer circuit 22d
Measures the time and causes the CPU 22a to execute the programs of FIGS. 3 to 10 every time the predetermined time is measured. The clock circuit 22e continuously counts the time regardless of whether the ignition switch is turned on or not.

The bus 21 has an interface circuit (I
A receiving circuit 24, a vehicle speed sensor 25, and an outside air temperature sensor 26 are connected via an / O) 23, and a display 28 is connected via a display control circuit 27. The receiving circuit 24 demodulates a received signal received by the antenna 24a and extracts transmission data transmitted from each sensor device 10. The vehicle speed sensor 25 detects the vehicle speed V, and
Is output. The outside air temperature sensor 26 is attached to a vehicle body (not shown) to detect the outside air temperature Ta,
A detection signal indicating the outside air temperature Ta is output. Display 28
Is arranged on an instrument panel or the like provided near the driver's seat, and is controlled by the display control circuit 27 to display abnormal air pressure of each tire, abnormality of each sensor device 10 itself, and the like.

Next, the operation of the embodiment configured as described above will be described. First, after mounting each tire on which the sensor device 10 is mounted on the vehicle, the operation switch 13 provided on each sensor device 10 is sequentially operated while the alarm device main body 20 is operated. By this operation, each sensor device 1
0 transmission circuits 14 each have their own identification number data ID
Is transmitted via the antenna 15 together with the operation data representing the operation of the operation switch 13.

In the alarm device main body 20, the receiving circuit 2
4 through the antenna 24a.
D and operation data are received. In response to the self identification number data ID and the operation data, the CPU 22a executes an ID registration program (not shown) and stores the self identification number data ID transmitted together with the operation data in the RAM 22c. The self identification number data ID is
Alarm device main body 2 when ignition switch is off
0 is the data to be stored even when non-operation of
It is stored in the nonvolatile area of the AM 22c. This allows
The alarm device main body 20 will be able to recognize each sensor device 10 attached to each tire mounted on the vehicle in the future.

After the registration of the self identification number data ID, the transmission circuit 14 of each sensor device 10
4b, the tire pressure sensor 1
1 and the transmission data obtained by adding the self-identification number data ID to the tire pressure Pt detected by the tire temperature sensor 12 and the tire temperature Tt detected by the tire temperature sensor 12, respectively.

In response to the transmission of the transmission data, the receiving circuit 24 of the alarm device main body 20 receives each transmission data,
Each time the transmission data is received, the CPU 22a is notified that the transmission data has been received. In response to this, the CPU 22a
Executes a data recording program (not shown) and sequentially stores, in the RAM 22c, data representing the tire pressure Pt and the tire temperature Tt together with the current time measured by the clock circuit 22e for each received self-identification number data ID. Go. In this case, it is necessary to store a plurality of data in the RAM 22c retroactively for each self-identification number data ID, and when a predetermined number of data is already stored in the RAM 22c, The oldest data is updated with new data. Incidentally, in order to save these recording data even after the ignition switch is turned off, similarly to the case of the self-identification number data ID, these recording data may be stored in a nonvolatile area of the RAM 22c. Then, when the ignition switch is turned off, the recording data may be moved from the volatile area of the RAM 22c to the non-volatile area, and may be stored while the ignition switch is in the off state.

The recording and storage of these data can be performed only after the ignition switch is turned on, as shown in FIG.
It is possible to determine an abnormality in air pressure of each tire, an abnormality in each sensor device 10 itself, and the like by the program of FIG. However, even if the ignition switch is not turned on, if this data recording program is operated in response to the input of data, and if the data is stored, abnormal air pressure of each tire can be obtained. In addition, the accuracy of the determination of the abnormality of each sensor device 10 is further improved.

Next, a description will be given of how the alarm device main body 20 determines whether the tire pressure is abnormal or the sensor device 10 itself is abnormal. When the ignition switch is turned on, the alarm device main body 20 starts to operate, and the timer circuit 22d
Starts repeatedly instructing the CPU 22a to execute the program of FIG. 3 at predetermined time intervals. Then, while the ignition switch is turned on, the CPU 22a repeatedly executes the program of FIG. 3 every predetermined time. The predetermined time is set to be substantially equal to or slightly larger than the data transmission interval of each sensor device 10.

The execution of this program is performed in step 100
And the ignition switch is turned on in step 101 (when this program is first executed)
It is determined whether or not a predetermined time or more has elapsed from. This determination is made in order to use the transmission data transmitted from each sensor device 10 and stored in the RAM 22c in the processing described later, so that all the sensor devices 1 are stored in the RAM 22c.
This is a process of waiting until transmission data related to 0 is stored. The predetermined time is set to a value slightly larger than the transmission interval by each sensor device 10. If this predetermined time has not elapsed since the ignition switch was turned on,
In step 101, “NO” is determined and step 110 is performed.
To end the program execution. If this predetermined time has elapsed since the ignition switch was turned on, step 1
01 is determined as “YES” and the program is executed in step 1
Proceed to 02 or later.

In step 102, it is determined whether or not the sleep flag SLF is "0". The sleep flag SLF indicates “0” indicating that the alarm device main body 20 is in a sleep release state in which it performs a determination operation such as abnormal air pressure of each tire or abnormality of each sensor device 10. Also, “1” indicates that the alarm device main body 20 is in a sleep state in which the determination operation is suspended. If the sleep flag SLF is “0”, “YES” is determined in step 102, and a “sleep determination routine” is performed in step 103 to determine whether or not the alarm device main body 20 is to be in a sleep state. Execute If the sleep flag SLF is “1”, “NO” is determined in step 102, and “sleep release determination” is determined in step 104 to determine whether to release the sleep state of the alarm device main body 20. Routine ".

After the processing in steps 103 and 104, it is determined again in step 105 whether or not the sleep flag SLF is "0". Sleep flag SLF is "0"
If so, it is determined "YES" in step 105,
In step 106, the presence or absence of abnormality in each sensor device 10 is determined, and in step 107, abnormality in air pressure of each tire is determined. On the other hand, the sleep flag SLF
If “1”, a “NO” determination is made in step 105 and the program proceeds to step 110, where each sensor device 10
The execution of this program is terminated without judging the abnormality of the timer and the abnormality of the air pressure of each timer.

In the determination of abnormality in step 106,
The abnormality of the sensor device 10 is determined, for example, when there is a sensor device that cannot receive the transmission data among all the sensor devices 10 or when there is a sensor device that transmits the impossible transmission data. Specifically, initially R
Self identification number data ID registered and stored in AM22c
Transmitted from each sensor device 10 at predetermined time intervals,
Reference is made to the transmission data recorded in M22c. And
If the transmission data corresponding to the self identification number data ID does not exist in the RAM 22c for a predetermined time (at least for a time exceeding a predetermined time that defines a transmission interval), it is determined that the sensor device 10 is abnormal. Further, even when the tire pressure Pt or the tire temperature Tt represented by the transmission data stored in the RAM 22c represents a high (or low) tire pressure or a tire temperature that cannot be theoretically considered, the sensor device 10 is not used. It is determined to be abnormal.

In the case where an abnormality relating to the sensor device 10 is determined in this way, at step 106, "YE
S ”, and the program proceeds to Step 108. In step 108, the display control circuit 27 is controlled to display on the display 28 that an abnormality has occurred in the sensor device 10. Thereby, the driver can recognize the abnormality of the sensor device 10. The driver may be notified of the abnormality of the sensor device by a sound such as a buzzer sound.

In the determination of the tire pressure abnormality in step 107, data representing the tire pressure Pt is sequentially read out of the transmission data transmitted from each sensor device 10 at predetermined intervals and recorded in the RAM 22c. Then, the tire pressure Pt represented by the read data and the reference tire pressure Pt0 are sequentially compared, and when the tire pressure Pt is smaller than the reference tire pressure Pt0 by a predetermined value or more, it is determined that the tire pressure is abnormal. In this determination, when it is continuously detected that the tire pressure Pt for the same self identification number data ID is smaller than the reference tire pressure Pt0 by a predetermined value or more, it is determined that the tire pressure is abnormal for the first time. Thus, even if the detected tire pressure Pt temporarily indicates an abnormal value, the abnormality determination may not be performed to avoid erroneous determination of the abnormality.

In this manner, when it is determined that the tire air pressure is abnormal, "YES" is determined in step 107, and the program proceeds to step 109. In step 109, the display control circuit 27 is controlled to display on the display 28 that the tire pressure is abnormal. Thereby, the driver can recognize the tire pressure abnormality. The driver may be notified of the tire pressure abnormality by a sound such as a buzzer sound.

If the abnormality of the sensor device 10 and the abnormality of the tire air pressure are not detected as described above, step 1 is executed.
In both cases, it is determined “NO” at steps 06 and 107, and step 1
At 10, the execution of this program is terminated. After this execution, every time a predetermined time elapses, this program is executed, and an abnormality of the sensor device 10 and an abnormality of the tire pressure are detected.

Next, the "sleep determination routine" of step 103 will be described. In the “sleep determination routine”, the “first sleep determination routine”
The “third sleep determination routine” is sequentially executed. Then, by executing these routines, it is determined whether or not the sensor device 10 is mounted on all tires. If the sensor device 10 is not mounted on all tires,
The sleep flag SLF is set to "1", that is, the alarm device main body 2
Set 0 to sleep state.

The execution of the "first sleep determination routine"
4. In step 201 of FIG. 4, in step 201, it is determined whether or not the transmission data from all the registered sensor devices 10 has been received (the transmission data from any one of the sensor devices 10 has not been received). Is determined to be “NO” when the request is received). In this case, RAM
The registered sensor device 10 (the self-identification number data I
For each D), it is checked whether there is a sensor device 10 in which transmission data is not recorded within a time slightly exceeding a predetermined time defining a transmission interval at least retroactively from the present.
If there is transmission data for at least one sensor device 10, “NO” is determined in step 201, and the program proceeds to step 202. Step 2
In 02, the count value CT1 is initialized to “0”, and in step 207, the execution of the “first sleep determination routine” ends.

If there is no transmission data for all the registered sensor devices 10, “YES” is determined in step 201, and the program is executed in steps 203 and 2.
Proceed to 04. Step 203 is a process for adding "1" to the count value CT1, and step 204 is a process for determining whether or not the count value CT1 is equal to or greater than a predetermined value CT10 (CT1 ≧ CT10). Only when “YES” is determined in step 201 for a predetermined time or more corresponding to “”, “YES” is determined in step 204, and in step 205, the sleep flag SLF is set to “1”. Otherwise, "NO" is determined in step 204, and the execution of the "first sleep determination routine" is terminated in step 207. The sleep flag S
The LF is stored in a non-volatile area of the RAM 22c so as to be retained even after the ignition switch is turned off, or is used when the ignition switch is turned off.
The data is transferred to the nonvolatile area of the AM 22c, and when the ignition switch is turned on, the data is read from the nonvolatile area and transferred to the volatile area for use. Also, when the sleep flag SLF is set to “1” at the time of executing the “second and third sleep determination routines” to be described later, the sleep flag SLF is set to “1” after turning off the ignition switch using the nonvolatile area as described above. To be saved as well.

After the sleep flag SLF is set to "1" in step 205, the reception flag RVF is set to "1" in step 206. The reception flag RVF is normally set to “0”, and only when the alarm device main body 20 is set to the sleep state on condition that transmission data has not been received from all registered sensor devices 10. It is set to "1" and is used in a first sleep release determination routine (FIGS. 7 and 8) described later. Therefore, the reception flag R
As with the case of setting the sleep flag SLF to “1”, the VF is stored even after the ignition switch is turned off by using the non-volatile area. Then, after the processing of step 206, the execution of the "first sleep determination routine" is terminated in step 207.

Such a "first sleep determination routine"
According to the above, the sleep flag SLF is set to “1” only when the state in which there is no transmission data for all the registered sensor devices 10 continues for a predetermined time or more.
The absence of transmission data for all registered sensor devices 10, that is, the alarm device main body 20 not receiving transmission from all sensor devices 10, means that all tires of the vehicle are changed from summer tires to studless tires, and vice versa. Since the tires were changed from studless tires to summer tires, the sensor device 10
It is assumed that the sensor device 10 was not mounted on the tire after the replacement although the tire was mounted. For example, even if it is assumed that the probability that an error occurs in one sensor device 10 and data transmission becomes impossible is 1%, all sensor devices 10 (four sensor devices in the present embodiment) cannot simultaneously transmit data. Since the probability of this becomes a very small value of 10 ⁻⁸ , in this case, it may be determined that the sensor device 10 is not mounted on the tire due to tire replacement or the like. Further, since the condition that the alarm device main body 20 does not receive the transmission data from all the sensor devices 10 for a predetermined time or more is set as a condition, the alarm device main body 20 may not be able to temporarily receive the transmission data due to some disturbance. Even if there is, there is no erroneous determination that the sensor device 10 is not mounted on the tire.

The "first sleep determination routine"
In step 202, it is checked whether or not the transmission data is recorded within a time slightly exceeding a predetermined time that defines the transmission interval at least retroactively from the present with respect to the sensor device 10 registered in step 201.
Of the alarm device main body 20 by all the sensor devices 1
It is determined whether or not the state of not receiving transmission data from 0 has continued for a predetermined time or more. However, by deleting the processing of steps 202 to 204 and examining a plurality of pieces of transmission data recorded in the RAM 22c from the present to the past with respect to the registered sensor device 10, the alarm device main body 20 It may be determined that the transmission data from all the sensor devices 10 has not been continuously received for a predetermined time or more. In addition, for simplification of the program and quick processing, the condition for a predetermined time in the determination condition can be deleted. In this case, the processing of steps 202 to 204 in FIG. 4 is deleted, and the program is executed in step 2 based on the determination result of step 201.
05 or step 207.

Next, the "second sleep determination routine" will be described. This “second sleep determination routine”
In a state in which the transmission data can be received from the sensor device 10, the non-attachment of the sensor device 10 to the tire is determined on the assumption that the tire pressure Pt and the tire temperature Tt increase if the vehicle is in a running state. It is. The "second sleep determination routine" is executed sequentially for each tire.

The execution of the "second sleep determination routine" is started in step 210 of FIG.
The determination processing of 1-214 is executed. In step 211, a plurality of transmission data recorded in the RAM 22c that are retroactive to the past are checked with respect to one sensor device 10 (self-identification number data ID) that is sequentially designated.
Whether or not the alarm device main body 20 is receiving the transmission data from the sensor device 10 is determined by whether or not the transmission data is present within a time slightly exceeding a predetermined time that defines the transmission interval retrospectively from the present. Is determined. If the transmission data exists, “YE” is determined in step 211.
S ”, that is, it is determined that the alarm device main body 20 is receiving transmission data from the sensor device 10.

In step 212, the vehicle speed sensor 2
5 is equal to the predetermined vehicle speed V0 (for example,
It is determined that the vehicle is running on the condition that the speed is 30 km / h) or more. In steps 213 and 214, a plurality of pieces of data representing the tire pressure Pt and the tire temperature Tt in the transmission data checked by the processing in the step 211 are checked from the present to the past, and the tire pressure Pt and the tire temperature Tt are increased. Determine if there is a tendency. For example, in the simplest case, comparing the newest transmission data with the previous transmission data, and when the newest transmission data is not higher than the previous transmission data,
It may be determined that the tire pressure Pt and the tire temperature Tt have not risen.

As a result of such determination, the alarm device body 20
Receives the transmission data from the sensor device 10 and the tire pressure P
If t and the tire temperature Tt have not risen, “YES” is determined in each of steps 211 to 214, and the program proceeds to steps 216 and 217. Otherwise, the program proceeds to step 215.

The processing in steps 215 to 217 is similar to the above-described "first sleep determination routine" except that the count value CT2 is counted up and that CT20 is employed as a predetermined value to be compared with the count value CT2. Is the same as the processing of steps 202 to 204 of "." Then, if "YES" is determined in step 217,
In step 218, the sleep flag SLF is set to "1", and in step 219, the execution of the "second sleep determination routine" is terminated. After the processing of step 215,
Also, in the case where “NO” is determined in step 217, the execution of the “second sleep determination routine” is ended in step 219.

When the sleep flag SLF is set to “1” by executing the “second sleep determination routine” for one sensor device 10, the “second sleep determination routine” for the sensor device 10 attached to the remaining tires is set. It is not necessary to execute the “sleep determination routine”. However, when the sleep flag SLF is still set to “0”, the “second sleep determination routine” is sequentially executed for the sensor devices 10 mounted on the remaining tires.

Therefore, according to the "second sleep determination routine", the transmission data can be received from the sensor device 10, and the fact that the tire pressure Pt and the tire temperature Tt do not increase even when the vehicle is in a running state is considered. Since the non-attachment of the sensor device 10 to the tire is determined as a condition, the non-attachment can be easily detected. Also in this case, since the condition that the state lasts for a predetermined time corresponding to the predetermined value CT20 for a predetermined time is set as the condition of the non-attachment of the sensor device 10 to the tire, the alarm device main body 20 temporarily receives the transmission data due to some disturbance. Even if it is impossible to do so, there is no erroneous determination that the sensor device 10 is not attached to the tire.

When the vehicle is running continuously for a long time, the tire pressure Pt and the tire temperature Tt are saturated, and the rise of the tire pressure Pt and the tire temperature Tt is stopped.
It is desirable that the execution of this determination routine be performed only for a predetermined time from the start of the vehicle. In this case, until the predetermined time elapses from the state where the vehicle speed V is “0”, the “second”
The sleep determination routine may be executed, and otherwise, the second sleep determination routine may not be executed. For example, the condition determination process may be inserted before step 211.

This "second sleep determination routine"
In the above, it was assumed that there was no increase in both the tire pressure Pt and the tire temperature Tt, but for simplicity,
It is also possible to make a condition that only one of the tire pressure Pt and the tire temperature Tt does not rise.
In this case, the determination process in step 213 or step 214 in FIG. 5 may be omitted.

The "second sleep determination routine"
In the same way as in the case of the above-mentioned "first sleep determination routine",
It is also possible to omit the processing of steps 215 to 217 and delete the condition relating to the predetermined time in the determination condition.

Next, the "third sleep determination routine" will be described. This “third sleep determination routine”
When the transmission data is being received from the sensor device 10 and the vehicle is in a running state, the tire temperature Tt becomes higher than the outside air temperature Ta, that is, the difference Tt−Ta between the two temperatures Tt and Ta increases. Is to determine whether the sensor device 10 is not mounted on the tire. For example, when the tire on which the sensor device 10 is mounted is replaced with another tire and the tire on which the sensor device 10 is mounted is stored in a trunk, the tire temperature Tt transmitted from the sensor device 10 is equal to the outside air temperature sensor 26. Becomes substantially equal to the detected outside air temperature Ta. The "third sleep determination routine" is also executed sequentially for each tire.

The execution of the "third sleep determination routine" is started at step 220 in FIG.
The determination processing of 1 to 223 is executed. The determination regarding the reception of the transmission data in step 221 and the determination of the traveling state of the vehicle in step 222 are exactly the same as the processes in steps 211 and 212 in the above-described “second sleep determination routine”. In step 223, as in the case of the "second sleep determination routine" described above, step 2 is executed.
Tire temperature Tt in the transmission data examined by the process of 21
Fetches the newest data from among a plurality of data retroactive from the present representing the. Further, the outside air temperature Ta is input from the outside air temperature sensor 26, and it is determined whether or not the absolute value | Tt-Ta | of the difference Tt-Ta between the tire temperature Tt and the outside air temperature Ta is equal to or less than a predetermined value ΔT. .

As a result of such determination, the alarm device body 20
Receives the transmission data from the sensor device 10 and the vehicle is running, the tire temperature Tt
Absolute value of the difference Tt-Ta between the temperature and the outside air temperature | Tt-Ta
If | is equal to or less than the predetermined value ΔT, steps 221 to 223
Are determined to be "YES", and the program proceeds to steps 225 and 226. Otherwise, the program proceeds to step 224.

The processing of steps 224 to 226 is similar to the above-described "first sleep determination routine" except that the count value CT3 is counted up and that CT30 is used as a predetermined value to be compared with the count value CT3. Is the same as the processing of steps 202 to 204 of "." If “YES” is determined in step 226,
In step 227, the sleep flag SLF is set to "1", and in step 228, the execution of the "third sleep determination routine" is terminated. After the processing of step 224,
Also, when the determination at step 226 is “NO”, the execution of the “third sleep determination routine” is terminated at step 228.

Also, in the case of the "third sleep determination routine", if the sleep flag SLF is set to "1" by executing this routine, the "third sleep determination routine" is executed for the sensor device 10 mounted on the remaining tires. It is not necessary to execute the “3 sleep determination routine”. However, when the sleep flag SLF remains set to “0”,
The “third sleep determination routine” is also newly executed sequentially for the sensor devices 10 mounted on the remaining tires.

Therefore, according to the "third sleep determination routine", the transmission data can be received from the sensor device 10, and the difference between the tire temperature Tt and the outside air temperature Ta, Tt- Absolute value of Ta | Tt
On the condition that −Ta | is equal to or smaller than the predetermined value ΔT, the non-mounting of the sensor device 10 with respect to the tire is determined, so that the non-mounting is easily detected. Also in this case, since the non-wearing condition is that the state continues for a predetermined time corresponding to the predetermined value CT30, the alarm device body 20 may not be able to temporarily receive the transmission data due to some disturbance. In addition, there is no erroneous determination that the sensor device 10 is not attached to the tire.

The "third sleep determination routine"
Is based on the increase in the tire temperature Tt due to the running of the vehicle, and it is conceivable that the increase in the tire temperature Tt is insufficient immediately after the start of the start of the vehicle. Therefore, in order to avoid erroneous determination that the sensor device 10 is not attached to the tire, it is preferable not to execute the “third sleep determination routine” immediately after the vehicle starts running. For example, the condition determination process may be inserted before step 221.

The "third sleep determination routine"
Is the difference Tt between the tire temperature Tt and the outside air temperature Ta.
On the condition that the absolute value | Tt−Ta | of −Ta is equal to or smaller than the predetermined value ΔT, the non-attachment of the sensor device 10 to the tire is detected. However, since the sensor device 10 is not mounted on the ground that the tire temperature Tt rises as compared with the outside air temperature Ta when the vehicle travels, the difference T obtained by subtracting the outside air temperature Ta from the tire temperature Tt is used.
The non-attachment of the sensor device 10 to the tire may be detected on the condition that t-Ta is equal to or smaller than the predetermined value ΔT. In this case, the determination process of step 223 is performed by Tt−
What is necessary is just to change to the comparison determination processing of Ta ≦ ΔT.

This "third sleep determination routine"
In the same way as in the case of the above-mentioned "first sleep determination routine",
It is also possible to omit the processing of steps 225 to 227 and delete the condition relating to the predetermined time in the determination condition.

When the non-attachment of the sensor device 10 to the tire is determined and the sleep flag SLF is set to "1" by executing the "first sleep determination routine" to the "third sleep determination routine". As described above, the sensor device 10 according to steps 106 and 108 in FIG.
Abnormality detection processing and abnormality alarm processing of step 107,
The abnormality detection process and the abnormality alarm process of the tire pressure Tt by 109 are not executed. Therefore, when a tire to which the sensor device 10 is not mounted is mounted on the vehicle, the notification of the abnormality of the sensor device 10 and the notification of the abnormality of the tire pressure Tt to the driver are automatically interrupted. Even if the user forgets to release these notification functions, it is possible to avoid erroneous notification of the abnormality of the sensor device 10 and erroneous notification of the abnormality of the tire pressure Tt.

In the sleep determination process (step 103 in FIG. 3), the "first sleep determination routine" to the "third sleep determination routine" are executed, but only one of these routines is executed. Run,
Any two routines may be executed.

Next, the "sleep release determination routine" of step 104 in FIG. 3 will be described. In the “sleep release determination routine”, a “first sleep release determination routine” to a “third sleep release determination routine” are sequentially executed. Then, by executing these routines, it is determined whether or not the sensor device 10 is mounted on all tires, and when the sensor device 10 is mounted on all tires (even one of all tires). When the sensor device 10 is not mounted (except when the sensor device 10 is not mounted), the sleep flag SLF is set to “0”, that is, the sleep state of the alarm device main body 20 is released.

The execution of the "first sleep release determination routine" is started in step 300 of FIG.
At 1, it is determined whether the reception flag RVF is "1". If the reception flag RVF is “1” and the alarm device main body 20 has been set to the sleep state on condition that the transmission data has not been received from all the registered sensor devices 10, “YES” in step 301. And the program proceeds to step 302 and subsequent steps. Otherwise, "NO" is determined in step 301,
In step 306, the execution of the "first sleep release determination routine" is terminated.

In step 302, whether the transmission data from all the registered sensor devices 10 has been received (if no transmission data from one of all the sensor devices 10 has been received, "NO" Is determined). Specifically, all registered sensor devices 10
With respect to (self-identification number data ID), it is checked whether all transmission data is recorded in the RAM 22c within a time slightly exceeding a predetermined time defining a transmission interval retroactively from the present. If transmission data relating to all sensor devices 10 (self-identification number data IDs) has been recorded, “YES” is determined in step 302, and the program proceeds to step 303. All registered sensor devices 1
If at least one sensor device 10 in which transmission data is not recorded exists among 0 (self identification number data ID), “NO” is determined in step 302, and the “first” is determined in step 306. The execution of the "sleep release determination routine" is terminated.

In step 303, the vehicle speed sensor 2
5 is equal to the predetermined vehicle speed V0 (for example, 3
0 km / h) or more, it is determined whether the vehicle is in a running state. If the vehicle is in a running state, “YES” is determined in step 303 and step 30
At step 4, the sleep flag SLF is returned to "0".
In step 305, the reception flag RVF is also returned to "0". Then, in step 306, the execution of the “first sleep release determination routine” ends. It should be noted that the sleep flag SLF and the reception flag RVF that have been returned to “0” as described above also have the two flags SLF and RV described above.
As in the case of setting F to "1", the data is stored even after the ignition switch is turned off using the nonvolatile area. Also, this means that the “first sleep release determination routine” and the “second and third
The same applies to the “sleep release determination routine”.

According to the "first sleep release determination routine", the alarm device main body 20 is set to the sleep state on condition that the transmission data from all the registered sensor devices 10 has not been received. Therefore, when the state changes to a state in which the transmission data from all the registered sensor devices 10 are received, the sleep flag SLF is returned to “0”, that is, the sleep state of the alarm device main body 20 is released. This corresponds to the fact that the tire replacement at the time of setting the alarm device main body 20 to the sleep state described above is restored, and the attachment of the sensor device 10 to the tire is accurately determined. Further, the alarm device main body 2 is provided on condition that the vehicle is running by the processing of step 303.
The sleep state of 0 is released. This allows
When a vehicle having a tire to which the sensor device 10 is not mounted is stopped in a garage or the like and a tire to which the sensor device 10 is mounted is placed in the garage or the like due to the above-described tire replacement, an alarm device is provided. The main body 20 can avoid erroneous determination that the sensor device 10 is mounted on a tire mounted on the vehicle.

Although the sleep flag SLF is once returned to "0" even if the determination processing of step 303 is deleted, if the vehicle leaves the garage or the like, the above-mentioned "No.
The flag SLF by executing the “1 sleep determination routine”.
Is set to "1" again. Therefore, the determination process of step 303 is deleted, and if "YES" is determined in step 302, the program is changed to step 3
04 may be directly advanced.

The "first sleep release determination routine" can be modified as shown in FIG. This modification is different from the sleep flag SLF only when transmission data is received from all the registered sensor devices 10 and the vehicle is in a running state for a predetermined time or more.
Is returned to "0". In the “first sleep release determination routine” according to this modification, after execution of step 310 is started, it is determined in step 311 whether or not the count flag CTF is “0”. The count flag CTF indicates a state in which transmission data is received from all registered sensor devices 10 by "1" and that the vehicle is detected to be in a running state, and "0" indicates other states. At first, the count flag CTF is "
0 ”,“ YE ”is set in step 311.
S ", and the program proceeds to Step 312 and subsequent steps. The determination processing in steps 312 to 314 is the same processing as the determination processing in steps 301 to 303 in FIG. 7, and step 3 is performed until the same determination condition as described above is satisfied.
It is determined to be “NO” in any of 12 to 314, and in “325”, the “first sleep release determination routine” is performed.
Terminates execution of.

On the other hand, if the judgment condition is satisfied,
If it is determined “YES” in each of 12 to 314,
In step 315, the count flag CTF is set to "1", in step 316, the count value CT4 is initialized to "0", and in step 325, the execution of the "first sleep release determination routine" is terminated. .

Next, when this “first sleep release determination routine” is executed, at step 311 “N
The determination is "O", and the program proceeds to step 317 and subsequent steps. In steps 317 and 318, similarly to steps 313 and 314, it is determined whether transmission data has been received from all the registered sensor devices 10 and whether the vehicle is in a running state. Then, the state continues, and steps 317 and 318 are performed.
In step 319, the count-up process is executed as long as the determination is "YES". And
When the count value CT4 reaches the predetermined value CT40, "YES" is determined in the step 321 and the steps 322, 32
At step 3, the sleep flag SLF and the reception flag RVF are set to "0" as in the processing of steps 304 and 305 in FIG.
Return to Then, in step 305, the count flag C
After the TF is also returned to “0”, the execution of the “first sleep determination release routine” is terminated in step 325.

If the transmission data is received from all the registered sensor devices 10 and the state that the vehicle is in the running state does not continue for a predetermined time corresponding to the predetermined value CT40, one of the steps 317 and 318 is executed. At "N
O ”, and the count flag C
The TF is returned to “0”, and this “first
The execution of the "sleep release determination routine" is terminated. In this case, when the “first sleep release determination routine” is executed again, “YES” in step 311
Based on this determination, the processing after step 312 is executed again.

According to the "first sleep release determination routine" according to such a modification, the transmission data is received from all the registered sensor devices 10 and the vehicle is in a running state for a predetermined time or more. Since the sleep flag SLF is returned to “0” for the first time, the attachment of the sensor device 10 to the tire can be detected with higher accuracy.

Next, a "second sleep release determination routine"
Will be described. This “second sleep release determination routine” corresponds to the above-mentioned “second sleep determination routine”, and if the vehicle is in a running state, the tire pressure Pt
On the assumption that the tire temperature Tt rises, the mounting of the sensor device 10 on the tire is determined. However, in this case, the sleep flag SLF is returned to “0” only when the rising condition related to the tire pressure Pt and the tire temperature Tt is satisfied for all the tires, that is, for all the registered sensor devices 10.

The execution of the "second sleep release determination routine" is started at step 330 in FIG. 9, and the determination processing of steps 331 to 334 is performed. Step 331
In the above, a plurality of transmission data recorded in the RAM 22c for all sensor devices 10 (self-identification number data ID) are checked from the present to the past, and a predetermined time defining the transmission interval from the present to the past is determined. It is determined whether or not the alarm device main body 20 has received the transmission data from the sensor device 10 based on whether or not the transmission data exists within a slightly longer time. If there is transmission data for all the sensor devices 10, “YES” in step 331, that is, the alarm device main body 20
It is determined that transmission data from 0 has been received.

In step 332, the vehicle speed sensor 2
5 is equal to the predetermined vehicle speed V0 (for example,
It is determined that the vehicle is running on the condition that the speed is 30 km / h) or more. In steps 333 and 334, a plurality of data indicating the tire pressure Pt and the tire temperature Tt in the transmission data checked by the processing of the step 331, which are retroactive from the present, are checked for each sensor device 10, and all the sensor devices are checked. Tire pressure Pt for 10
It is determined whether the tire temperature Tt is increasing. For example, in the simplest case, comparing the newest transmission data with the previous transmission data, if the newest transmission data is higher than the previous transmission data by a predetermined value or more,
It may be determined that the tire pressure Pt and the tire temperature Tt are increasing.

As a result of such determination, the alarm device main body 20
Has received the transmission data from all of the sensor devices 10, the vehicle is running, and if the tire pressure Pt and the tire temperature Tt for all of the sensor devices 10 have increased, in steps 331 to 334 Each "YE
S ", and the program is changed to steps 335 and 336.
Proceed to Then, at step 335, the count value CT
5 is incremented by "1", and in step 336, it is determined whether or not the count value CT5 is equal to or greater than a predetermined value CT50. If the count value CT5 is less than the predetermined value CT50, “NO” is determined in the step 336, and the execution of the “second sleep release determination routine” is ended in the step 339. Further, the data reception, while the vehicle is running,
If the conditions regarding the tire pressure Pt and the tire temperature Tt are not satisfied, “NO” is determined in any of Steps 331 to 334, and the count value CT is determined in Step 337.
5 is initialized to “0”, and the execution of the “second sleep release determination routine” is ended in step 339.

During the reception of the data and the running of the vehicle, conditions relating to the tire pressure Pt and the tire temperature Tt are satisfied.
If “YES” is continuously determined in steps 332 to 334, the count value CT5 is gradually increased by the processing in step 335. When the count value CT5 becomes equal to or greater than the predetermined value CT50, "YES" is determined in step 336, and the sleep flag SLF is set to "" in step 338.
0 ", and the execution of the" second sleep release determination routine "is terminated in step 339.

Therefore, according to the "second sleep release determination routine", the transmission data from all the sensor devices 10 can be received, the vehicle is running, and the tire pressure Pt and the tire temperature Tt increase. Since the mounting of the sensor device 10 on the tire is determined on the condition that the vehicle is in the condition, the mounting is easily detected. Also in this case, since the condition for mounting the sensor device 10 on the tire is that the state lasts for a predetermined time corresponding to the predetermined value CT50 or more, the mounting of the sensor device 10 on the tire can be reliably determined.

In the "second sleep release determination routine", the tire pressure Pt and the tire temperature Tt are used.
However, for simplicity, it is also possible to use only one of the tire pressure Pt and the tire temperature Tt. In this case, the determination processing in step 333 or step 334 in FIG. 5 may be omitted.

Also, in the "second sleep release determination routine", as in the case of the "first sleep release determination routine", the processing of steps 335 to 337 is performed in order to simplify and speed up the program. Omitting,
The condition relating to the predetermined time in the determination condition may be deleted.

Next, a "third sleep release determination routine"
Will be described. This “third sleep release determination routine” is the above-mentioned “third sleep determination routine” (FIG. 6).
When the vehicle is in a running state, the tire temperature Tt becomes higher than the outside air temperature Ta, that is, the sensor for the tire is provided on the assumption that the difference Tt−Ta between the two temperatures Tt and Ta increases. This is for determining the mounting of the device 10. However, also in this case, the outside air temperature Ta for all the tires, that is, for all the registered sensor devices 10.
The sleep flag SLF is returned to "0" only when the condition for increasing the tire temperature Tt with respect to

The execution of the "third sleep release determination routine" is started at step 340 in FIG. 10, and the determination processing of steps 341 to 343 is performed. Step 34
(1) Determination regarding reception of transmission data, and step 34
The determination of the traveling state of the vehicle of No. 3 is exactly the same as the processing of step 331 and step 332 of the above-mentioned “second sleep release determination routine”. In step 343, as in the case of the “second sleep release determination routine”,
The most recent data value of a plurality of data indicating the tire temperature Tt in the transmission data of all the sensor devices 10 checked by the process of the step 341 and being retroactive from the present is extracted. Also, the outside air temperature Ta is inputted from the outside air temperature sensor 26, and the tire temperature Tt and the outside air temperature Tt are inputted.
It is determined whether or not the difference Tt−Ta from “a” is equal to or more than a predetermined value ΔT.

As a result of such determination, the alarm device main body 20
Receives the transmission data from all the sensor devices 10, the vehicle is running, and the difference Tt−Ta between the tire temperature Tt and the outside air temperature Ta for all the sensor devices 10.
Is greater than or equal to the predetermined value ΔT, it is determined “YES” in each of steps 341 to 343, and the program proceeds to steps 344 and 345. Otherwise, the program proceeds to step 346.

The processing in steps 344 to 346 is similar to the above-described “second sleep release determination” except that the count value CT6 is counted up and that CT60 is used as a predetermined value to be compared with the count value CT6. This is the same as the processing in steps 335 to 337 of the “routine”.
If “YES” is determined in the step 345, the sleep flag SLF is set to “0” in a step 347.
Then, in step 348, the execution of the "third sleep release determination routine" is terminated. After the processing of step 346, and also in the case where “NO” is determined in step 345, the execution of the “second sleep determination routine” is ended in step 348.

Therefore, according to the "third sleep release determination routine", the transmission data can be received from the sensor device 10, the vehicle is running, and the difference Tt-Ta between the tire temperature Tt and the outside air temperature Ta is determined by a predetermined value. Since the mounting of the sensor device 10 on the tire is determined on condition that the value is equal to or larger than the value ΔT, the mounting is easily detected. Also, in this case, the condition of the mounting is that the state lasts for the predetermined time corresponding to the predetermined value CT60 for the predetermined time, so that the mounting of the sensor device 10 on the tire is reliably determined.

In the "third sleep release determination routine", as in the "second sleep release determination routine", the processing of steps 344 to 346 is performed in order to simplify and speed up the program. Omitting,
The condition for a predetermined time in the determination condition may be deleted.

When the mounting of the sensor device 10 on the tire is determined and the sleep flag SLF is returned to “0” by executing the “first sleep release determination routine” to the “third sleep release determination routine”, As described above, the sensor device 1 according to steps 106 and 108 in FIG.
0 abnormality detection processing and abnormality alarm processing;
The abnormality detection processing and abnormality alarm processing of the tire pressure Tt by the steps 7 and 109 are restarted. Therefore, when the tire on which the sensor device 10 is mounted is mounted on the vehicle, the notification of the abnormality of the sensor device 10 and the notification of the abnormality of the tire pressure Tt to the driver are automatically restarted. Of the sensor device 10 and the tire pressure T
Notification of t is automatically made.

In the sleep determination process (step 103 in FIG. 3), the "first sleep release determination routine" to the "third sleep release determination routine" are executed. Or two of the routines may be executed.

In the above embodiment, the sensor device 10 transmits data representing the tire pressure Pt to the alarm device main body 20, and the main body 20 determines and displays the abnormality of the tire pressure Pt. . However, the sensor device 10 has a built-in circuit device or mechanism for determining an abnormality in the tire pressure Pt, and transmits data representing the abnormality in the tire pressure Pt from the sensor device 10 to the alarm device main body 20. Based on this data, the alarm device body 2
0 may indicate an abnormal tire pressure.

The alarm device main body 20 displays the tire pressure abnormality when the tire pressure Pt abnormally decreases as the information on the tire pressure according to the present invention. Alternatively, the tire pressure Pt itself or the tire pressure Pt may be displayed in a plurality of stages such as high, normal, slightly low, and extremely low as information on the tire pressure.

In the above-described embodiment, even when at least one of the registered sensor devices 10 is not mounted on a tire, the alarm device main body 20 controls all the tires. The notification of the tire pressure and the abnormality of the sensor device 10 itself are set to the sleep state. However, instead of this, the sensor device 1
The notification of the tire air pressure and the abnormality of the sensor device 10 may be set to the sleep state only for the tires to which 0 is not mounted. In this case, except for the "first sleep determination routine" and the "first sleep release determination routine", the "second and third sleep determination routines" and the "second and third sleep release determination routines" The sleep state and the release of the sleep state in the alarm device main body 20 may be performed for each of the sensor devices 10, respectively.

Further, in the above embodiment, the alarm device main body 20 always determines the abnormality of the tire pressure, the abnormality of the sensor device 10 itself, the determination of the sleep state, and the determination of the sleep release state at regular time intervals. Although the determination is performed, the determination may be performed also when data is transmitted from the sensor device 10. In addition, immediately after the ignition switch is turned on, when a change in tire air pressure is detected (particularly, when the tire air pressure decreases), the frequency of each of the above determinations may be increased. In these cases, the execution frequency of the program of FIG. 3 executed by the timer 22d may be changed according to the above conditions. In these cases, it is preferable to increase the frequency of transmitting the transmission data also on the sensor device 10 side.

Further, immediately after the ignition switch is turned on, only when the tire air pressure fluctuates, the sleep judging process, sleep cancel judging process and tire air pressure abnormality judging process shown in FIG. 3 may be executed.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram of a sensor device.

FIG. 2 is a circuit block diagram of the alarm device main body.

FIG. 3 is a flowchart of a program executed by the microcomputer unit of FIG. 2;

FIG. 4 is a flowchart of a first sleep determination routine executed in the sleep determination routine of FIG. 3;

FIG. 5 is a flowchart of a second sleep determination routine executed in the sleep determination routine of FIG. 3;

FIG. 6 is a flowchart of a third sleep determination routine executed in the sleep determination routine of FIG. 3;

FIG. 7 is a flowchart of a first sleep release determination routine executed in the sleep release determination routine of FIG. 3;

FIG. 8 is a flowchart showing a modification of the first sleep release determination routine.

FIG. 9 is a flowchart of a second sleep release determination routine executed in the sleep release determination routine of FIG. 3;

FIG. 10 is a flowchart of a third sleep release determination routine executed in the sleep release determination routine of FIG. 3;

[Explanation of symbols]

10: Sensor device, 11: Tire pressure sensor, 12:
Tire temperature sensor, 13 operation switch, 14 transmission circuit, 14a ID memory, 14b timer circuit, 15
Antenna, 16 ... battery, 20 ... alarm device main body, 22 ... microcomputer unit, 24 ... receiving circuit, 24 a ... antenna, 25 ... vehicle speed sensor, 26 ... outside temperature sensor, 28
…display.

Claims (8)

[Claims] 1. A tire mounted on a tire of a vehicle for detecting a tire pressure and receiving a signal from a sensor device for transmitting a signal representing the detected tire pressure, and a tire based on the received signal. A tire pressure warning device comprising: a pressure information notifying unit that notifies a driver of information on air pressure; detecting whether or not the sensor device is mounted on the tire; and detecting that the sensor device is not mounted on the tire. A tire pressure alarm device, further comprising an interruption unit for interrupting the notification of the tire pressure information to the driver by the air pressure information notification unit when the tire pressure is detected. 2. The tire pressure warning device according to claim 1, wherein the sensor device is connected to the tire in a state in which the notification of the information on the tire pressure to the driver by the pressure information notification device is interrupted by the interruption device. Detecting whether or not the sensor device is mounted on the tire, and when detecting that the sensor device is mounted on the tire, canceling the interruption of the notification of the tire pressure to the driver by the air pressure information notifying means is released. A tire pressure warning device comprising means. 3. A receiving means mounted on a tire of a vehicle for detecting a tire pressure and receiving a signal from a sensor device for transmitting a signal representing the detected tire pressure, and a tire based on the received signal. Air pressure information notifying means for notifying a driver of information on air pressure, and a sensor abnormality notification for judging an abnormality of the sensor device and notifying the driver of the abnormality on condition that at least no signal is received from the sensor device. Means for detecting whether the sensor device is mounted on the tire, and detecting that the sensor device is not mounted on the tire, at least by the sensor abnormality notification means A tire pressure warning device, further comprising a suspending means for suspending notification of an abnormality of a sensor device to a driver. 4. The tire pressure alarm device according to claim 3, wherein the sensor device is mounted on the tire in a state where the notification of the abnormality to the driver by the sensor abnormality notification unit is interrupted by the interruption unit. Detecting whether or not the sensor device is mounted on a tire, when the sensor abnormality notification means to at least cancel the interruption of the notification of the abnormality of the sensor device to the driver by the sensor abnormality notification means, A tire pressure warning device provided. 5. The tire pressure warning device according to claim 1, wherein said sensor device is mounted on each of a plurality of tires of a vehicle, and said receiving means is provided with each sensor. Each of the sensors receives the signal from the device, the interrupting means, the sensor unit is mounted on the tire, provided that the receiving means does not receive signals from all the sensor devices mounted on each tire A tire pressure warning device that detects that the tire pressure has not been detected. 6. The tire pressure warning device according to claim 1, wherein the interruption means indicates a state of the tire, and a physical quantity that changes with the running of the vehicle changes during the running of the vehicle. A tire pressure warning device for detecting that the sensor device is not mounted on a tire on condition that the sensor device is not mounted on the tire. 7. The tire pressure warning device according to claim 2, wherein said sensor device is mounted on each of a plurality of tires of a vehicle, and said receiving means receives a signal from each sensor device. The interruption canceling means, wherein the receiving means is mounted on each tire from a state in which the receiving means has not received signals from all the sensor devices mounted on each tire, respectively. A tire pressure alarm device for detecting that the sensor device is mounted on a tire on condition that the state has changed to a state in which signals from all sensor devices have been received. 8. The tire pressure warning device according to claim 2, wherein the suspension canceling means indicates that the physical quantity that indicates the state of the tire and changes with running of the vehicle changes during running of the vehicle. A tire pressure warning device for detecting that the sensor device is mounted on a tire under a condition.