JP2004155352A - Tire pressure monitoring system and method for registering id code in tire pressure monitoring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a load for registration work in the case that the ID codes of the sensor units of only some tires must be registered when changing tires. <P>SOLUTION: In a tire pressure monitoring system, the mounting positions of tires 15, 25, 35 and 45 provided with sensor units 10, 20, 30 and 40 wherein ID codes must be registered to a tire pressure monitor ECU50 are renewed in a specified order (Steps S40 and S41) every time when a mode selector switch SW60 is operated. For this reason, even in the case that the ID code to be registered is related to the sensor units of some tires of a vehicle, the position of a tire to which the sensor unit is secured is selected. Therefore, an ID code can be registered only for the sensor unit to which the ID code must be registered. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tire pressure monitoring system that monitors the state of each tire pressure of a vehicle, and a unique ID code assigned to a sensor unit that measures each tire pressure and transmits the measurement result in the tire pressure monitoring system. Is registered in the monitoring unit.
[0002]
[Prior art]
Conventionally, various systems for monitoring the pressure of each tire provided in a vehicle have been proposed. As one of them, a sensor unit including a sensor for detecting tire pressure and a transmitter for transmitting a detected value of the tire pressure is attached to each tire, a signal transmitted from the sensor unit is received, and a signal for each tire is received. There is a tire pressure monitoring system in which a monitoring unit that issues a warning when the detected pressure value is equal to or less than a predetermined value is provided on the vehicle body side.
[0003]
In this tire pressure monitoring system, a unique ID code is assigned to each sensor unit in order to determine whether or not the transmitted signal is transmitted from a sensor unit of a tire attached to the own vehicle. Then, the ID code is transmitted together with the detected tire pressure value. In the monitoring unit, the ID code of the sensor unit of each tire attached to the vehicle is registered in advance, and when the ID code included in the transmission signal from each sensor unit matches the registered ID code, the transmission signal is transmitted. It is determined whether or not the detected pressure value included in the above is an appropriate value. In this way, the reliability of monitoring the pressure of each tire is ensured by using the ID code assigned to each sensor unit.
[0004]
[Problems to be solved by the invention]
Here, registration of the ID code of the sensor unit provided for each tire in the monitoring unit is performed in the following procedure.
[0005]
First, the monitoring unit is switched from the monitoring mode (normal mode) to the registration mode by performing a predetermined switch operation or the like. Then, for example, the pressure of each tire is rapidly reduced, and a transmission signal including an ID code is forcibly transmitted from each sensor unit. When the monitoring unit is in the registration mode and receives a transmission signal including an ID code from each sensor unit, the ID code is registered in the monitoring unit.
[0006]
Here, for example, when a defect such as a puncture occurs in one tire and the tire is replaced, it is necessary to register the ID code of the sensor unit provided on the replaced tire in the monitoring unit.
[0007]
However, in the conventional tire pressure monitoring system, it is not possible to register only the ID code of one tire, and in this case, the ID code of the sensor unit is re-registered for all tires including the replaced tire. It is necessary to do. For this reason, there has been a problem that the work of registering the ID code of the sensor unit is large.
[0008]
The present invention has been made in view of the above points, and it is possible to reduce the workload of the registration work when only the ID code of the sensor unit of some tires is to be registered, such as when replacing a tire. It is an object of the present invention to provide a simple tire pressure monitoring system and a method of registering an ID code in the tire pressure monitoring system.
[0009]
[Means for Solving the Problems]
To achieve the above object, a tire pressure monitoring system according to claim 1 is provided for each tire of a vehicle to measure each tire pressure, and transmit the tire pressure measurement value and a unique ID code. A plurality of sensor units for transmitting signals,
A tire pressure monitoring system including a monitoring unit that receives transmission signals from a plurality of sensor units and monitors a state of each tire pressure based on an ID code and a pressure measurement value included in the transmission signals.
Switching means for switching the operation mode of the monitoring unit to one of a monitoring mode for monitoring a state of each tire pressure and a registration mode for registering a unique ID code given to a transmission means provided for each tire;
When the operation mode of the monitoring unit is switched to the registration mode, a selection unit that selects a tire mounting position of the sensor unit to be registered with the ID code,
In the registration mode, when the ID code of the sensor unit is given in the registration mode, the monitoring unit registers the ID code in association with the tire mounting position selected by the selection unit.
[0010]
As described above, in the tire pressure monitoring system according to the first aspect, the means for selecting the mounting position of the tire including the sensor unit to be registered with the ID code is provided. For this reason, even if the ID code to be registered is related to the sensor unit of a part of the tire of the vehicle, the mounting position of the tire to which the sensor unit is mounted can be selected. The registration work can be performed only for the sensor unit to be registered.
[0011]
Then, regarding the registration of the ID code, the monitoring unit can register the ID code in association with the tire mounting position. Therefore, when an abnormality such as a decrease in tire pressure is detected in the monitoring mode, an abnormality occurs. The notification can be made including the position of the tire. This makes it possible to improve serviceability in monitoring the tire pressure.
[0012]
As described in claim 2, it is preferable that the monitoring unit includes display means for displaying the tire attachment position of the sensor unit to which the ID code is to be registered, which is selected by the selection means. Thereby, the worker can grasp the tire mounting position of the sensor unit to be registered at a glance. Note that this display means can also be used as a display means for notifying abnormality of the tire pressure.
[0013]
As described in claim 3, the monitoring unit determines in advance the registration order of the ID codes for the sensor units of the respective tires mounted on the vehicle according to the mounting positions thereof, and the selecting means determines the registration order. It is preferable to select an arbitrary tire attachment position by changing the tire attachment position of the sensor unit to be registered in accordance with the following. In other words, the configuration is such that the tire mounting position of the sensor unit to be registered is changed in accordance with the registration order for each operation of the selecting means, so that an arbitrary tire mounting position can be selected with a simple configuration. it can.
[0014]
As described in claim 4, it is preferable that the monitoring unit updates the mounting position of the tire having the sensor unit to be registered in accordance with the registration order every time the registration of the ID code is completed. If the registration order of the ID code is determined in advance and the tire mounting position of the sensor unit to be registered is updated each time the registration is completed, the work efficiency is improved when the sensor units are registered for all tires. It is because it can improve.
[0015]
As described in claim 5, the monitoring unit may switch the registration mode to the monitoring mode when the registration of the ID codes for the number of tires having the sensor unit to be registered with the ID code is completed. preferable.
[0016]
For example, when one tire is replaced, the ID code is registered with the sensor unit at the mounting position of the replaced tire as a registration target. In this case, since the registration of the ID code of the sensor unit has already been performed for the other tires, the registration mode ends when the registration of the ID code of the sensor unit for the replacement tire is completed. Thereby, the registration mode is automatically terminated when the registration of the necessary ID code of the sensor unit is completed, so that the workability of the registration work can be improved.
[0017]
The invention described in claims 6 to 9 relates to a method of registering an ID code in the tire pressure monitoring system described above. However, the operation and effect of the invention described in each claim are the same as the operation and effect of the above-described tire pressure monitoring system, and thus the description thereof will be omitted.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, an example in which the tire pressure monitoring system is applied to a four-wheel passenger car will be described. However, the tire pressure monitoring system according to the present invention can be applied to trucks, buses, and the like.
[0019]
FIG. 1 is a configuration diagram illustrating a schematic configuration of the tire pressure monitoring system according to the present embodiment. FIG. 2 is a functional block diagram of the tire pressure monitoring system. As shown in FIGS. 1 and 2, in the tire pressure monitoring system 1, a transmission that transmits a transmission signal including the measured pressure and a unique ID code by a pressure sensor 11, 21,. Are provided for the tires 15, 25, 35, 45 of the front, rear, left and right wheels. The sensor units 10, 20, 30, and 40 are configured integrally with a tire valve, for example, and attached to a disc wheel of a tire. In addition, as the sensor units 10, 20, 30, and 40, a temperature sensor for measuring a temperature may be provided in addition to the pressure sensor. Accordingly, when determining the state of the tire pressure, it is possible to take into account the fluctuation of the tire pressure due to the temperature change.
[0020]
The receiving antennas 13, 23, 33, 43 are provided in each wheel house of the vehicle, and receive transmission signals from the transmitters 12, 22,. The received signals received by the receiving antennas 13, 23, 33, 43 are sent to respective receivers 52, 53,..., And processing such as amplification of the received signals is performed. Thereafter, the received signals are sent to the tire pressure monitor ECU 50, and the pressure states of the tires 15, 25, 35, and 45 are determined based on the pressure measurement values included in the received signals. In FIG. 1, the display of the receivers 52 and 53 is omitted for simplification.
[0021]
Also, the receiving antennas 13, 23, 33, 43 and the receivers 52, 53 are not provided individually for the sensor units 10, 20, 30, 40, but are provided with a common receiving antenna and receiver. The transmission signal from each of the sensor units 10, 20, 30, and 40 may be received by the receiving antenna and the receiver.
[0022]
The determination result of the pressure state of each tire 15, 25, 35, 45 by the tire pressure monitor ECU 50 is displayed on a display 70 provided on an instrument panel in the vehicle compartment. As shown in FIG. 2, the display 70 includes a display unit 71 made up of an LED or the like corresponding to a mounting position of each of the tires 15, 25, 35, and 45. When the tire pressure monitor ECU 50 determines that the tire pressure is abnormal, such as when the tire pressure has decreased to a predetermined pressure or less, the display unit 71 corresponding to the tire for which abnormality has been determined is turned on, and the driver is notified of the tire pressure. Notifies pressure abnormalities.
[0023]
The tire pressure monitoring system according to the present embodiment further includes a mode switch (SW) 60. The mode switching SW 60 changes the operation mode of the tire pressure monitor ECU 50 which plays a central role of the monitoring unit provided on the vehicle body side from the monitoring mode for monitoring the pressure state of each of the tires 15, 25, 35, 45 to the respective modes. The mode is switched to a registration mode for registering unique ID codes assigned to the sensor units 10, 20, 30, and 40.
[0024]
Next, the flow of arithmetic processing executed in the tire pressure monitoring system having the above configuration will be described with reference to the flowcharts of FIGS.
[0025]
First, in step S10 in FIG. 3, the operation mode of the tire pressure monitor ECU 50 is determined. For example, when the mode switch SW60 is configured as a push switch, the operation mode of the tire pressure monitor ECU 50 is switched to the registration mode by pressing the mode switch SW60. In step S10, it is determined whether or not the operation mode has been switched to the registration mode by such a mode switching SW60.
[0026]
If it is determined in step S10 that the operation mode has not been switched to the registration mode, that is, if the operation mode of the pressure monitor ECU 50 is the monitoring mode, a well-known tire pressure monitoring routine is executed in step S20. That is, each of the pressure sensors 11, 21, ... measures the pressure of each of the tires 15, 25, 35, 45, and each of the transmitters 12, 22, ... is provided to each of the sensor units 10, 20, 30, 40. A transmission signal including the unique ID code and the pressure measurement value is transmitted at predetermined time intervals. When the transmitted signal is input to the tire pressure monitor ECU 50 via the receiving antennas 13, 23, 33, 43 and the receivers 52, 53,..., The tire pressure monitor ECU 50 first registers the received ID code and itself. The ID code is compared with the ID code, and it is determined whether or not the two satisfy a predetermined relationship such as coincidence. When it is confirmed by this determination that the tires 15, 25, 35, and 45 attached to the vehicle have been transmitted from the sensor units 10, 20, 30, and 40, the pressure detection included in the received signal is detected. It is determined whether the value is an appropriate value. As described above, by using the ID code assigned to each of the sensor units 10, 20, 30, and 40, it is possible to prevent erroneous determination of tire pressure based on a signal from another vehicle or the like, and to monitor tire pressure. Reliability can be improved.
[0027]
Further, the ID code assigned to each sensor unit 10, 20, 30, 40 is registered in the tire pressure monitor ECU 50 in association with the mounting position of the tire on which the sensor unit 10, 20, 30, 40 is arranged. . For this reason, when the tire pressure monitor ECU 50 determines that the tire pressure is abnormal, such as a case where the detected pressure value included in the received signal is lower than a predetermined pressure, the tire mounting position of the tire having the abnormal tire pressure is identified from the ID code. Then, the display unit 71 corresponding to the tire mounting position is turned on. Thus, the driver can immediately grasp which tire pressure of the vehicle is abnormal.
[0028]
On the other hand, if it is determined in step S10 that the operation mode of the tire pressure monitor ECU 50 has been switched to the registration mode, the process proceeds to step S30 to execute an ID code registration routine. Hereinafter, the ID code registration routine will be described in detail with reference to FIGS. This ID code registration routine registers the ID code assigned to each of the sensor units 10, 20, 30, and 40 in the tire pressure monitor ECU 50 constituting the monitoring unit before the vehicle is shipped from the factory or at the time of tire replacement. It is implemented for.
[0029]
First, in step S31, one of the display units 71 of the display 70 blinks the mounting position of the tires 15, 25, 35, and 45 including the sensor units 10, 20, 30, and 40 for which an ID code is to be registered. Display by The mounting positions of the tires 15, 25, 35, and 45 including the sensor units 10, 20, 30, and 40 to be registered are determined in a predetermined order each time registration is completed (for example, left front wheel → right front wheel → right rear wheel → It is set in advance so as to be updated by the left rear wheel. Therefore, in the case of this example, first, the sensor unit 20 of the tire 25 of the left front wheel is to be registered, and the display unit 71 displayed as FL blinks.
[0030]
In the registration waiting state in step S31, when the mode switch SW60 is continuously operated for a predetermined time or longer, an interrupt routine shown in FIG. 5 is executed. This interrupt routine is for changing the mounting position of the tires 15, 25, 35, and 45 including the sensor units 10, 20, 30, and 40 for which the ID code is to be registered. Hereinafter, this interrupt routine will be described.
[0031]
As described above, the registration order is determined for the sensor units 10, 20, 30, and 40 for which ID codes are to be registered according to the mounting positions of the tires 15, 25, 35, and 45. Immediately after the start, the sensor unit 20 of the front left (FL) wheel is to be registered.
[0032]
The mounting positions of the tires 15, 25, 35, 45 having the sensor units 10, 20, 30, 40 to be registered can be changed by operating the mode switching SW 60 when the interrupt routine is started. Can be. That is, as shown in step S40 in FIG. 5, it is determined whether or not the mode switch SW60 has been operated. If the mode switch SW60 has been operated, in step S41, the sensor units 10, 20, and The mounting positions of the tires 15, 25, 35, and 45 including the tires 30, 40 are updated in accordance with the registration order. In this case, the display unit 71 corresponding to the updated mounting position blinks, and the updated mounting position is stored in the internal memory.
[0033]
Specifically, the tires 15, 25, 35, and 45 including the sensor units 10, 20, 30, and 40 to be registered in step S40 according to one operation of the mode switching SW 60 according to the above-described predetermined order. Is advanced by one position (FL wheel → FR wheel → RR wheel → RL wheel). By repeating the operation of the mode switching SW 60 until a desired tire mounting position is reached, the tire mounting positions of the sensor units 10, 20, 30, and 40 to be registered can be changed to any positions. At this time, every time the mounting position advances, the position of the blinking display unit 71 also advances accordingly. Thereby, the operator can always check the tire mounting position to be registered.
[0034]
When the mounting position of the tires 15, 25, 35, and 45 including the sensor units 10, 20, 30, and 40 to be registered with the ID code is changed to a desired position, and the operation of the mode switching SW 60 is completed, In step S40, it is determined that there is no SW operation, and the process proceeds to step S42. In step S42, it is determined whether a state in which the mode switching SW 60 is not operated has passed for a predetermined time. Then, when a predetermined time has elapsed without any operation of the mode switching SW 60, the interrupt routine ends.
[0035]
When the at least one tire 15, 25, 35, 45 is replaced, the interrupt routine described above updates the registration target position to the tire mounting position to be replaced and replaces the sensor unit 10, 20, 30, and 40 ID codes can be registered.
[0036]
In the processing of steps S40 and S41, the mode switch SW60 was used as a switch for changing the tire mounting positions of the sensor units 10, 20, 30, and 40 to be registered. However, it goes without saying that another switch may be used to change the tire mounting position for which the ID code is registered. Although the interrupt routine is terminated when the operation of the mode switching SW 60 is not performed for a predetermined time, the interrupt routine may be terminated based on another switch operation.
[0037]
In step S31, if the above-described interrupt routine is executed and the mounting position of the tire including the sensor units 10, 20, 30, and 40 for which the ID code is to be registered has been updated, the updated tire mounting position is determined. The display unit 71 stored in the internal memory and corresponding to the changed tire mounting position blinks. On the other hand, if the tire mounting positions of the sensor units 10, 20, 30, 40 to be registered have not been changed, the sensor units 10, 20, 30, 40 to be registered first are to be registered according to the above-described predetermined order. The display section 71 corresponding to the tire mounting position is blinked.
[0038]
Step S31 is to wait for the processing of steps S32 and S33 described later while displaying the registration target position on the display 70. The elapsed time from the start of the standby is longer than a predetermined time. If not, the process proceeds to step S34 without performing the processes of steps S32 and S33.
[0039]
In step S32 executed after step S31, a predetermined operation is performed on the sensor units 10, 20, 30, and 40 at the tire positions to be registered, so that the sensor units 10, 20, 30, and A signal including an ID code is transmitted from 40. That is, as the predetermined operation, the pressures of the tires 15, 25, 35, and 45 detected by the sensor units 10, 20, 30, and 40 are suddenly changed (rapidly increased and decreased), or the sensor units 10, 20, 30, and 40 are detected. , A predetermined trigger signal is transmitted by wireless to transmit a transmission signal including an ID code from the sensor units 10, 20, 30, and 40.
[0040]
In addition, in order to give the ID code to be registered to the tire pressure monitor ECU 50, various means other than the above-described transmission of the transmission signal including the ID code from each sensor unit may be employed. For example, a barcode reader (not shown) and a tire pressure monitor ECU 50 are connected by wire or wirelessly, a barcode corresponding to an ID code to be registered is read by a barcode reader, and the read signal is read by the tire pressure monitor ECU 50. May be given.
[0041]
When the operation mode of the pressure monitor ECU 50 is switched to the registration mode and the ID code is given from the sensor units 10, 20, 30, 40, etc., as described above, the tire pressure monitor ECU 50 causes the sensor unit 10, The received ID code is stored in an internal memory or the like in association with the tire mounting position provided with 20, 30, and 40, and the ID code is registered. As described above, the tire pressure monitor ECU 50 converts the ID code given to the sensor unit 10, 20, 30, 40 into the tire 15, 25, 35, 45 provided with the sensor unit 10, 20, 30, 40. By storing in association with the mounting position, it is possible to immediately identify which tires 15, 25, 35, and 45 have an abnormality when an abnormality in the tire pressure occurs.
[0042]
In step S33, the display unit 71 corresponding to the mounting position of the tire including the sensor units 10, 20, 30, and 40 for which the registration of the ID code is completed is lit on the display 70 for a predetermined time, for example, so that the sensor unit is turned on. The completion of registration of the ID codes 10, 20, 30, and 40 is notified.
[0043]
In step S34, one tire mounting position of the sensor units 10, 20, 30, and 40 to be registered is updated according to the above-described predetermined order. As described above, each time the registration is completed, the tire mounting position including the sensor units 10, 20, 30, and 40 to be registered is automatically updated, so that the work efficiency of the ID code registration operation is improved. Can be.
[0044]
In step S35, it is determined whether registration of the ID codes of all the sensor units 10, 20, 30, and 40 has been completed. If the registration of the ID codes of all the sensor units 10, 20, 30, and 40 has not been completed, the processing from step S31 to step S34 is repeated. When the registration of the ID codes of all the sensor units 10, 20, 30, and 40 is completed, the process proceeds to step S36. When one tire is replaced, for example, when the ID code of the sensor unit of the tire is registered, the ID codes of the remaining sensor units are already registered. It is determined that the registration of the ID codes 30, 40 has been completed, and no further registration work is required.
[0045]
If not all tires but two or more tires are replaced and the ID codes of a plurality of sensor units are registered at the same time, the ID code is stored in association with the tire mounting position at which the registration work is to be performed. It is sufficient to provide a step of erasing the existing ID code, and then perform the processing of step S31 and subsequent steps in FIG. Thereby, the processing from step S31 to step S34 is repeated until the erased ID code is newly registered, so that a plurality of ID codes can be registered.
[0046]
Further, in step S35, a process of comparing the elapsed time from the start of the registration mode with a predetermined time (for example, 10 minutes) may be added. Thus, it is possible to avoid a state in which the registration work is interrupted for some reason while the tire pressure monitor ECU 50 is switched to the registration mode. When it is determined that the elapsed time is longer than the predetermined time, the registration routine shown in FIG. 4 ends without executing the processing shown in step S36.
[0047]
In step S36, the display 71 indicates that registration of the ID codes of all the sensor units 10, 20, 30, and 40 has been completed. For example, on the display 70, all the display units 71 corresponding to the mounting positions of the tires are turned on, for example, for a predetermined time to notify the completion of the registration of the ID codes of all the sensor units 10, 20, 30, and 40. Thus, it is possible to easily confirm that the registration of all the ID codes has been completed for the sensor units 10, 20, 30, and 40 of all the tires 15, 25, 35, and 45 attached to the vehicle.
[0048]
Note that a tire including the sensor units 10, 20, 30, and 40 to be registered may or may not include a spare tire.
[0049]
In addition, the display unit 71 of the display 70 does not simply blink or light, but may change the display color according to various states. For example, red may be displayed when the tire pressure is abnormal, yellow when the ID code is registered, green when the registration is completed, and the like.
[0050]
Further, a display capable of directly displaying the measured pressure of each tire 15, 25, 35, 45 may be used as the display 70. In this case, when registering the ID code, for example, as shown in FIG. 6, the mounting positions of the tires 15, 25, 35, and 45 may be displayed in a list, and the registration status of the ID code of the sensor unit may be displayed. good. In this case, the symbol indicating the tire mounting position to be registered is flashed or highlighted.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a schematic configuration of a tire pressure monitoring system according to an embodiment.
FIG. 2 is a functional block diagram of a tire pressure monitoring system.
FIG. 3 is a flowchart illustrating control executed by a tire pressure monitor ECU 50;
FIG. 4 is a flowchart illustrating a registration routine of an ID code assigned to the sensor units 10, 20, 30, and 40;
FIG. 5 is a flowchart showing an interrupt routine for updating a mounting position of a tire on which sensor units 10, 20, 30, and 40 to be registered are mounted.
FIG. 6 is an explanatory diagram showing another example of the display 70.
[Explanation of symbols]
1 Tire pressure monitoring system 10, 20, 30, 40 Sensor unit 11, 21 Pressure sensor 12, 22 Transmitter 13, 23, 33, 43 Receiving antenna 15, 25, 35, 45 Tire 50 Pressure monitor ECU
52, 53 Receiver 60 Mode changeover switch 70 Indicator

Claims (9)

A plurality of sensor units that are provided on each tire of the vehicle and measure each tire pressure, and transmit a transmission signal including the measured pressure value and a unique ID code;
A tire pressure monitoring system comprising: a transmission unit that receives transmission signals from the plurality of sensor units and that monitors a state of each tire pressure based on an ID code and a pressure measurement value included in the transmission signals.
Switching means for switching the operation mode of the monitoring unit between a monitoring mode for monitoring the state of each tire pressure and a registration mode for registering a unique ID code assigned to a transmission means provided for each tire. When,
When the operation mode of the monitoring unit is switched to the registration mode, selecting means for selecting a mounting position of a tire of a sensor unit to be registered an ID code,
In the registration mode, when an ID code of the sensor unit is given in the registration mode, the monitoring unit registers the ID code in association with a tire mounting position selected by the selection unit. . 2. The tire pressure monitoring system according to claim 1, wherein the monitoring unit includes a display unit that displays a tire attachment position of the sensor unit for which an ID code is to be registered, selected by the selection unit. 3. The monitoring unit determines a registration order of the ID code in advance for a sensor unit of each tire mounted on a vehicle according to a mounting position thereof, and the selection unit becomes a registration target according to the registration order. The tire pressure monitoring system according to claim 1 or 2, wherein an arbitrary tire mounting position is selected by changing a tire mounting position of the sensor unit. The tire pressure monitoring according to claim 3, wherein the monitoring unit updates a mounting position of a tire having a sensor unit to be registered in accordance with the registration order every time registration of the ID code is completed. system. The monitoring unit switches the registration mode to the monitoring mode when registration of the ID codes for the number of tires including the sensor unit to be registered with the ID code is completed. The tire pressure monitoring system according to any one of claims 1 to 4. A plurality of sensor units that are provided on each tire of the vehicle and measure each tire pressure, and transmit a transmission signal including the measured pressure value and a unique ID code;
An ID code in a tire pressure monitoring system comprising: a monitoring unit that receives transmission signals from the plurality of sensor units and monitors a state of each tire pressure based on an ID code and a pressure measurement value included in the transmission signals. Registration method,
A step of switching the operation mode of the monitoring unit from a monitoring mode for monitoring the state of each tire pressure to a registration mode for registering a unique ID code assigned to a sensor unit provided for each tire;
When the operation mode of the monitoring unit is switched to the registration mode, a step of selecting a mounting position of a tire of a sensor unit to be registered with an ID code,
Providing the ID code of the sensor unit to the monitoring unit to register the ID code of the sensor unit in association with the selected tire attachment position. How to register the code. In the selecting step, the registration order of the ID code is predetermined for the sensor unit of each tire mounted on the vehicle according to the mounting position, and the tire of the sensor unit to be registered is determined in accordance with the registration order. The method for registering an ID code in the tire pressure monitoring system according to claim 6, wherein an arbitrary tire mounting position is selected by changing the mounting position. The installation position of a tire having a sensor unit to be registered is updated in accordance with the registration order every time the registration of the ID code is completed in the registration process of the ID code. Registration method of ID code in the tire pressure monitoring system of the present invention. In the step of registering the ID code, when the registration of the ID codes for the number of tires including the sensor unit to be registered with the ID code is completed, the registration mode is switched to the monitoring mode. A method for registering an ID code in the tire pressure monitoring system according to any one of claims 6 to 8.

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