JP2006017463A - Tire pneumatic pressure monitoring system capable of facilitating registration of transmitter id, and transmitter id registering method capable of facilitating registration of transmitter id - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable easy registration of a transmitter ID in a receiver by a setting device with a simple structure. <P>SOLUTION: In a tire pneumatic pressure monitoring system, the transmitter ID is registered in the receiver by the setting device with the simple structure. A physical irritation is provided to the transmitter to be set. In response to this physical irritation, the transmitter transmits the transmitter ID at a predetermined time interval by a predetermined number of times. A receiving means, when continuously receiving the transmitter ID by the predetermined number of times, records identification information that is continuously received by the predetermined number of times. By performing this process in the order of predetermined tire positions, the receiver can register all transmitter IDs while relating the tire positions to the received transmitter IDs. In registering a specific transmitter, the mounted position of the transmitter to be set may be previously inputted into the receiving means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention generally relates to a tire pressure monitoring system that monitors the condition of a tire such as the pressure of a tire attached to a vehicle, and more particularly, sets the ID of a transmitter attached to a tire in the tire pressure monitoring system to a receiver. It relates to the technology to be registered.

  Today, in passenger cars, trucks, buses, and other vehicles with wheels that have tires assembled on rims (wheels), tire conditions such as tire pressure and temperature are constantly monitored, and whether the tires are abnormal based on the monitoring results. There is known a tire pressure monitoring device that improves the safety of a vehicle by determining and notifying a driver of abnormality such as tire pressure when necessary.

  For example, a pressure sensor that measures air pressure and a transmitter that wirelessly transmits air pressure data measured by the pressure sensor in a tire cavity region that is surrounded by the inner peripheral surface of the tire and the bottom surface of the rim bottom and is filled with air Are provided as a unit. Since such a sensor and transmitter (hereinafter simply referred to as a transmitter) is attached to each wheel or tire, an ID code is assigned so as to be distinguished. Each transmitter transmits its ID code together when transmitting information such as air pressure collected by the sensor. On the other hand, an antenna of a receiver that receives information from a transmitter is provided in the vicinity of the tire house on the vehicle body side, and air pressure data is received by this antenna.

  The receiver compares the received ID code with the ID registered in the receiver to determine where the transmitted ID code belongs to the tire and then identifies the tire thus identified. It is determined whether or not the air pressure is abnormal. If the air pressure is abnormal, the driver is notified that the air pressure is abnormal.

  On the other hand, the tire assembled on the wheel changes the mounting position of the wheel at every fixed mileage of the vehicle or as necessary so that uneven wear of the tire tread portion does not occur and the life of the tire is shortened. So-called wheel rotation including tires is performed. In this case, since the transmitter is installed and fixed in the hollow area of the tire, the wheel is mounted at another mounting position while the transmitter is fixed when the wheel rotates. For this reason, the correct mounting position information after the change of the wheel mounting position must be given to the receiver so that the identification information of the transmitter after the rotation is associated with the mounting position of the wheel actually mounted on the vehicle. I must.

As a technique for setting and registering a transmitter ID, for example, Patent Document 1 is available. In Patent Document 1, the setting device wirelessly transmits an ID to be set in the transmitter to the transmitter and sets the ID in the transmitter, and receives the ID and wheel mounting position information separately set and input. By wirelessly transmitting to the machine, the receiver associates the ID with the mounting position, and the result of this association is set and registered.
Japanese Patent Application No. 2003-109565

However, in the conventional method, since the setting device itself directly registers the transmitter ID with respect to the receiver, the configuration of the setting device is complicated.
The present invention has been made in view of the above points, and an object of the present invention is to provide a tire pressure monitoring system capable of easily registering a transmitter ID in a receiver.

  It is another object of the present invention to provide a transmitter ID registration method that allows a transmitter ID to be easily registered in a tire pressure monitoring system.

  For the above purpose, the present invention provides, in one aspect, a method for registering transmitter identification information (transmitter ID) in a receiver. The transmitter ID registration method of the present invention is provided on one or more wheels of a vehicle, and is provided in a vehicle main body and transmission means for wirelessly transmitting wheel information obtained by a sensor attached to the attached wheel together with identification information. A tire pressure monitoring system comprising: a receiving means for wirelessly receiving a transmission signal transmitted by a transmitting means; and a display means for displaying at least wheel information based on a transmitter ID and wheel information received by the receiving means. A step of applying a physical stimulus to the transmitting means to be performed, a step of transmitting the transmitter ID a predetermined number of times at a predetermined time interval according to the physical stimulus, and a receiving means continuously transmitting the transmitter ID If the predetermined number of times is received, the step of recording the identification information received the predetermined number of times continuously as the transmitter ID of the transmission means to be registered Characterized in that it comprises a.

  When the identification information of all the transmission means attached to the wheels is registered in a predetermined order, the transmission means to be registered is a transmission means having a number to be registered according to the predetermined order.

  If the transmitting means to be registered is a specific one of all transmitting means attached to the wheel, the method further comprises the step of notifying the receiving means of the mounting position of the transmitting means to be registered, The identification information received for the predetermined number of times may be recorded in association with the attachment position of the transmission means to be registered.

The physical stimulus may be any one of electromagnetic induction and electromagnetic waves having a predetermined intensity that changes at a predetermined frequency or higher.
The physical stimulus may be a change in air pressure when air is introduced into the tire of the wheel to which the transmission means to be set is attached.

It is preferable that the predetermined time interval is so short that transmission of wheel information by other transmission means can hardly occur during transmission of the predetermined number of times.
Furthermore, in another aspect, the present invention provides a tire pressure monitoring system. The tire pressure monitoring system of the present invention is provided on one or more wheels of a vehicle, and is provided on a vehicle body, transmitting means for wirelessly transmitting wheel information obtained by a sensor attached to the attached wheel together with identification information, A receiving unit that wirelessly receives a transmission signal transmitted by the transmitting unit; and a display unit that displays at least wheel information based on the identification information and the wheel information received by the receiving unit. Means for transmitting the identification information a predetermined number of times at predetermined time intervals in response to the stimuli, and every time the receiving means continuously receives the identification information a predetermined number of times, all the transmission means attached to the wheel And means for recording the identification information received a predetermined number of times in succession in a predetermined order.

  In another aspect, the present invention provides a tire pressure monitoring system. The tire pressure monitoring system of the present invention includes the transmission means, the reception means, and the display means described above, and the reception means includes a means for marking a mounting position of the designated transmission means. Means for transmitting the identification information a predetermined number of times at predetermined time intervals according to a physical stimulus given from the outside, and when the reception means receives the identification information a predetermined number of times continuously, It includes a means for recording the identification information received a predetermined number of times as the identification information of the transmission means.

  According to the present invention, a transmitter ID can be easily registered in a receiver by a setting device having a simple structure.

Hereinafter, the present invention will be described in detail with reference to embodiments of the present invention and the accompanying drawings. In addition, when showing the same element in several drawing, the same referential mark is attached | subjected.
[First Embodiment]
FIG. 1 shows a tire pressure monitoring system 1 for a large vehicle 90 such as a truck or a bus. As shown in FIG. 1, the vehicle 90 has a plurality of wheels 92, and each wheel 92 is an assembly of tires and rims (wheels), and each wheel is mounted at a predetermined mounting position. T1 to T6 specify a position where the tire 92 is mounted, and may be a simple sequence number or a combination of letters and numbers.

  The transmitter 4 is installed and fixed on the bottom surface of the rim constituting one wall surface of the tire cavity region of each wheel 92, and wirelessly transmits measured air pressure data and the like. The transmitter mainly has a receiving function for receiving a predetermined signal in addition to a transmitting function for transmitting air pressure data and temperature data. Since the transmitter 4 is attached to each tire 92, it can be identified by the tire position information T1 to T6 in the same manner as the tire.

  A receiver communication unit 5 is provided in the vicinity of each mounting position where the wheels 92 of the vehicle 90 are mounted, and receives information transmitted from the transmitter 4 by radio. The receiver communication unit 5 includes an antenna and an amplifier, and is connected to the receiver main body unit 6 with a cable or the like. And each receiver communication part 5 communicates with the transmitter 4 with which the nearby tire was mounted | worn.

The receiver main body 6 is connected to a display 7 that notifies the driver of air pressure data.
FIG. 2 is a diagram showing a configuration of the transmitter 4 of FIG. In FIG. 2, the transmitter 4 includes a communication control unit 24, a pressure sensor 9, and a temperature sensor 10.

  The pressure sensor 9 measures tire air pressure using a semiconductor pressure sensor, a capacitance pressure sensor, or the like that measures gauge pressure, differential pressure, or absolute pressure. The temperature sensor 10 is a semiconductor temperature sensor or a resistance element type temperature sensor, and measures the temperature in the cavity region of the tire. The communication control unit 24 includes an AD conversion circuit 11, a timer circuit 12, a microprocessor 13, a memory 14, an RF (radio frequency) transmission circuit 15, and an LF (low frequency) reception circuit 16 connected to the pressure sensor 9 and the temperature sensor 10. , A transmitting antenna 17, a receiving antenna 18, and a battery 19 as a power source for each circuit. When the tire air pressure is within a predetermined allowable range set in advance, the timer circuit 12 sends the tire air pressure and temperature measurement results from the transmitting antenna 17 to the receiver communication unit at regular intervals, for example, every 10 minutes. Management of the measurement interval and transmission interval for repeated transmission toward.

  When the AD converter circuit 11, the microprocessor 13 and the RF transmitter circuit 15 are always driven, a large amount of driving power is required. Therefore, when the tire air pressure is normal by the timer circuit 12, the AD converter circuit 11, the microprocessor 13 and the RF transmitter circuit 15 are driven at regular time intervals. Is a sleep mode in which processing and transmission of the transmitter 4 (simply indicated as 4 except for a specific transmitter) are suspended. Thereby, consumption of the battery 19 is reduced, and the transmitter 4 can monitor the tire pressure over a long period of time.

  The microprocessor 13 uses the air pressure data and temperature data obtained by AD conversion, and the identification information (TID) and data signal (data such as word length) of the transmitter 4 called from the memory 14 to arrange in the vicinity. A transmission signal to be transmitted to the installed receiver communication unit 5 is generated. Further, a new TID is stored and held in the memory 14, and the operation of each circuit is controlled.

In addition to storing and holding the TID of the transmitter 4, the memory 14 can store measured air pressure data, temperature data, and the like.
The RF transmission circuit 15 modulates and amplifies the carrier wave in accordance with an oscillation circuit (not shown) that generates a carrier wave having a predetermined frequency, for example, 315 MHz, and a transmission signal generated by the microprocessor 13 and transmits the carrier wave. Any suitable carrier wave modulation method may be used.

  According to the present invention, the LF receiving circuit 16 receives a signal transmitted from a setting device to be described later, and when the received signal strength, frequency, duration, and the like satisfy predetermined conditions, the TID transmission instruction A signal indicating that the signal is to the microprocessor 13.

  In order to make it possible to change the transmitter TID, the TID included in the signal received by the microprocessor 13 is extracted from the received signal including the TID input and set in the setting device. May be stored in the memory 14 as a new TID of the transmitter.

  The antenna 17 is configured to radiate a radio wave of, for example, 315 MHz toward the receiver communication unit 5a and the setting device. The antenna 18 is configured to receive, for example, a 125 kHz radio wave from the setting device. Since the operating frequency which is the operating condition of the radio waves in the antennas 17 and 18 is extremely different, the antenna 17 and the antenna 18 have different configurations so that the antenna can transmit and receive efficiently. As the battery 19, a known battery such as CR-613 (coin-type manganese dioxide lithium battery) is used.

  Next, FIG. 3 is a configuration diagram showing the receiver body 6 and the receiver communication unit 5 connected thereto. Each receiver communication unit 5 includes an antenna 20 and an amplifier circuit (AMP) 21. The antenna 20 is configured to receive radio waves transmitted from the transmitter 4.

  The receiver main unit 6 includes a demodulation circuit 22 that demodulates a signal from a high-frequency signal supplied from each receiver communication unit 5, a timer circuit 23, a microprocessor 24, a memory 25, and a signal processing circuit 26. The The timer circuit 23 is used to drive the microprocessor 24, the demodulation circuits 22a to 22f, and the signal processing circuit 26 by starting the receiver main body 6 from the sleep mode to the drive mode at regular time intervals. As the power source, the battery of the truck vehicle 2 is used. Alternatively, a battery or the like built in the receiver main body 6 may be used.

  The microprocessor 24 acquires the transmitter TID, air pressure data, temperature data, and the like from the signals supplied from the respective demodulation circuits 22, and stores the transmitter TID stored in the memory 25 in association with the wheel mounting position information. , The tire position at which the mounting position is determined by the air pressure data and the temperature data is specified from the acquired TID. The memory 25 stores and holds the measured pressure and temperature in addition to the set TID. The interface (IF) 26 converts the data received from the microprocessor 24 into a format suitable for the display 7.

Note that the receiver communication unit 5 described above can change the number of antennas depending on the vehicle type. For example, reception from all transmitters may be received by a single antenna.
5A is a diagram showing an appearance of a setting device according to a preferred embodiment of the present invention, and FIG. 5B is a schematic block diagram showing a configuration. As shown in FIG. 5A, the setting device 8 of the present invention provides a transmitter TID transmission command signal (hereinafter referred to as a trigger signal) to the transmitter when the TID of the transmitter 4 is to be registered in the receiver 6. It has a button 30 for operating in case. 4B, the setting device 8 includes the button 30, the battery 34 serving as a power source, a trigger signal transmission circuit 38 that transmits a signal having a predetermined frequency with a predetermined amplitude as long as power is supplied, the battery 34, and the trigger signal. A switch circuit 36 connected between the transmitter circuit 38 and for turning on / off the power to the trigger signal transmitter circuit 38, and the switch circuit 36 which is constantly supplied with power according to the operation of the button 30 only for a certain period. The switch control circuit 34 is turned on. From such a configuration, the setting device 8 does nothing because the switch circuit 36 is normally off (when the button 30 is not pressed). However, when the button 30 is pressed, the switch control circuit 32 turns on the switch circuit 36 for a certain time, so that the trigger transmission circuit 38 transmits a signal of a predetermined frequency with a predetermined amplitude only during that period.

The transmitter TID registration operation of the tire pressure monitoring system 1 configured as described above will be described.
In the following description, it is assumed that each transmitter 4 attached to the tire 92 of the vehicle 90 is set with a TID.
(Sequential registration of all transmitter TIDs)
First, a case where the TIDs of all transmitters 4 are registered in the receiver 6 in such a situation will be described. In this case, it is a simple way to register the transmitter TID in a predetermined order of the tire positions (T1 to T6), for example, in the order of the tire position numbers. Specifically, the user may press the button 30 of the setting device 8 by bringing the setting device 8 close to the tire of the transmitter 4 to register the TID in the order of registration. For example, when registering the TID of the transmitter 4 attached to the tire 92 at the tire position T5, as shown in FIG. 1, the setter 8 is brought closer to the tire 92 at the tire position T5 and the button 30 is pressed. .

  Then, a trigger signal is transmitted from the setting device 8 as described above. According to the present invention, when each transmitter 4 receives a signal with a substantially predetermined amplitude and a substantially predetermined frequency, it determines that this is a trigger signal for instructing TID transmission, and is set in its own memory 14. The transmitter TID is transmitted a predetermined number of times n at a cycle much shorter than the normal tire information transmission cycle. This is shown in FIG. Thus, by transmitting a predetermined number of TIDs in a period much shorter than the normal tire information transmission cycle, it is possible to distinguish them from tire information transmission signals, so that TIDs can be registered reliably.

  FIG. 6 is a flowchart showing an operation when the receiver 6 receives a signal. While receiving the same TID continuously (without receiving data including other TIDs), the receiver 6 stores a registration candidate TID temporary storage area (for convenience, a register TID) for holding the TID as a registration candidate. The memory 25 has a reception frequency register for storing the reception frequency RC of the TID. It is assumed that RC is initialized to zero in the initial state when the power is turned on. 6 is preferably performed as an interrupt process when data is received.

  In FIG. 6, when the receiver 6 receives the data, in step 52, the received TID is already registered, that is, various tire information in addition to the TID are related to the tire position ID (for example, T1 to T6). It is determined whether or not it is in the tire information table 40 to be accommodated (FIG. 5A). If there is, the data is from one of the tires 92 of the vehicle 90 that it monitors, so in step 54, normal data fetching processing is performed, and the interrupt processing in FIG. 6 is terminated.

  If the received TID is not registered, it is determined in step 56 whether or not the reception count RC is 1 or more, that is, whether or not a previously unregistered TID has been received once or more. If NO, since it is an unregistered TID received for the first time, there is a possibility that it will be sent n-1 times in the future for registration. In step 58, the received TID is written into the registration candidate TID register 44 and RC is stored. Increment, set RC = 1, and end the interrupt process.

  If the determination result in step 56 is YES, the TID is a TID received continuously one or more times. Therefore, in step 60, it is checked whether or not the received TID is the same as the TID in the registration candidate TID register 44. If they are not the same, in step 62, the received data is discarded, the number of receptions RC is set to 0, and the interrupt process is terminated. If the determination result at determination step 60 is YES, it is determined at step 66 whether RC + 1 is equal to a predetermined number n. If they are not equal, in step 68, RC + 1 is written as RC in the reception count register 46, and the interrupt process is terminated. In step 66, when RC + 1 is equal to n, the received TID is to be registered. Therefore, in step 70, the received TID is registered in the record to be registered this time in the tire information table 40. Which record should be registered is determined to be registered in the order of a predetermined tire position, as described above, and is registered in that order.

Thus, according to the present invention, only TIDs received n times in succession are registered, so that they are not registered by mistake. In particular, if a TID transmitted n times is transmitted within 1 to several seconds, for example, the possibility of being interrupted by normal tire information transmission of another transmitter during the n times transmission can be reduced.
(Register TID)
Normally, registration of transmitter identification information is performed when the tire is rotated, and so on, as described above, all transmitters may be sequentially registered. However, consider a case where a specific transmitter ID is desired to be registered, for example, when a new transmitter is replaced due to a failure.

  One solution is to provide a function that allows the receiver 6 to pre-enter the tire position ID of the tire transmitter 4 that is to be registered. Thus, after inputting the tire position ID of the transmitter 4 to be registered to the receiver 6, the setter 8 is brought close to the tire 2 at the tire position and the button 30 is pressed.

  The other is to allow registration with the tire position ID when registering the TID in the transmitter 4 itself. The button 30 may be pushed by bringing the setting device 8 close to the tire 2 at the tire position of the transmitter 4 to be registered. At this time, the transmitter 6 sends the tire position ID together with the TID, so that the receiver 6 can correctly register the TID.

As described above, according to the present invention, the ID of the transmitter can be easily registered in the receiver by the setting device having a simple structure.
Further, when registering the IDs of all transmitters, the operation is very simple because the receiver does not need to perform any operation.

  The above are merely examples for explaining the present invention. Accordingly, it is easy for those skilled in the art to make various changes, modifications, or additions to the above-described embodiments in accordance with the technical idea or principle of the present invention.

  For example, in the above-described preferred embodiment, the trigger signal is transmitted from the setting device. In short, if it is desired to register the transmitter identification information, it is only necessary to be able to inform the transmitter in question. Therefore, the start of registration can be instructed by applying an appropriate physical stimulus that cannot occur accidentally to the transmitter to be registered. As such a stimulus, for example, electromagnetic induction, electromagnetic waves, or a predetermined change in air pressure by putting air into a tire can be used.

1 is a schematic diagram illustrating an overall configuration of a tire pressure monitoring device according to an embodiment of the present invention. It is a schematic block diagram of the transmitter 4 of FIG. It is a schematic block diagram of the receiver communication part 5 and the receiver main body 6 of FIG. It is a figure which shows the external appearance of the setting device 8 shown in FIG. 3 is a block diagram showing an internal configuration of a setting device 8. FIG. It is a figure which shows a part of structure of the body and the information table 40 which are stored in the memory 25 of FIG. It is a figure which shows the registration candidate TID temporary storage part 44 and the reception frequency storage part 46 which are provided in the memory 25 of FIG. It is a flowchart which shows the flow of the operation | movement which a receiver performs by one Embodiment of this invention. 4 is a timing chart showing a transmitter transmitting a transmitter identifier TID according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tire pressure monitoring apparatus 4 Transmitter 5 Receiver communication part 6 Receiver main body 7 Display device 8 Setting device 9 Pressure sensor 10 Temperature sensor 11 A / D conversion circuit (AD)
12, 23 Timer circuit 13, 24 Microprocessor (MP)
14 Memory 15 Transmission Circuit 16 Reception Circuit 17, 18, 20 Antenna 19 Battery 21 Amplifier (AMP)
22 Demodulator 24 Communication Controller 25 Memory 26 Interface Circuit (IF)
Reference Signs List 30 Start button 32 Switch control circuit 34 Battery 36 Switch circuit 38 Trigger signal transmission circuit 90 Vehicle 92 Wheel

Claims (11)

Transmitting means attached to one or more wheels of the vehicle, and wirelessly transmitting wheel information obtained by a sensor attached to the attached wheel together with identification information;
A receiving unit that is provided in the vehicle body and wirelessly receives the transmission signal transmitted by the transmitting unit;
In a tire pressure monitoring system comprising: display means for displaying at least the wheel information based on the identification information and the wheel information received by the receiving means;
Applying a physical stimulus to the transmission means to be registered;
In response to the physical stimulus, the transmitting means transmits the identification information a predetermined number of times at predetermined time intervals;
A registration step of recording the identification information received the predetermined number of times continuously as the identification information of the transmission unit to be registered when the reception unit continuously receives the identification information the predetermined number of times. A method of registering transmitter identification information in a receiver.   In the case where the identification information of all the transmission means attached to the wheels is registered in a predetermined order, the transmission means to be registered is a transmission means of the number to be registered according to the predetermined order. 2. A method of registering transmitter identification information in a receiver as claimed in claim 1 characterized in that: In the case where the transmitting means to be registered is a specific one of all transmitting means attached to the wheel,
Further comprising the step of informing the receiving means of the mounting position of the transmitting means to be registered,
2. The transmitter identification according to claim 1, wherein the registration step records the identification information received the predetermined number of times in succession in relation to the attachment position of the transmission means to be registered. A method of registering information with a receiver.   4. The transmitter identification information according to claim 1, wherein the physical stimulus is any one of electromagnetic induction and electromagnetic waves having a predetermined intensity that changes at a predetermined frequency or more. 5. How to register to the machine.   5. The transmitter identification information according to claim 4, wherein the physical stimulus is a change in air pressure when air is introduced into a tire of a wheel to which the transmission means to be set is attached. how to.   The said predetermined time interval is short so that transmission of the said wheel information by another transmission means cannot generate | occur | produce while transmitting only the said predetermined number of times. A method for registering the described transmitter identification information in a receiver. Transmitting means attached to one or more wheels of the vehicle, and wirelessly transmitting wheel information obtained by a sensor attached to the attached wheel together with identification information;
A receiving unit that is provided in the vehicle body and wirelessly receives the transmission signal transmitted by the transmitting unit;
Display means for displaying at least the wheel information based on the identification information and the wheel information received by the receiving means;
The transmitting means includes means for transmitting the identification information a predetermined number of times at a predetermined time interval according to a physical stimulus given from the outside;
Each time the receiving means continuously receives the identification information for the predetermined number of times, the receiving means is associated with all the transmitting means attached to the wheel in a predetermined order and receives the predetermined number of times continuously. A tire pressure monitoring system comprising means for recording the identification information. Transmitting means attached to one or more wheels of the vehicle, and wirelessly transmitting wheel information obtained by a sensor attached to the attached wheel together with identification information;
A receiving unit that is provided in the vehicle body and wirelessly receives the transmission signal transmitted by the transmitting unit;
Display means for displaying at least the wheel information based on the identification information and the wheel information received by the receiving means;
The receiving means includes means for marking a mounting position of a designated transmitting means;
The transmitting means includes means for transmitting the identification information a predetermined number of times at a predetermined time interval according to a physical stimulus given from the outside;
When the receiving means receives the identification information continuously for the predetermined number of times, the identification information received for the predetermined number of times is recorded as the identification information of the transmitting means at the marked attachment position. A tire pressure monitoring system comprising means for:   The tire pressure monitoring system according to claim 7 or 8, wherein the physical stimulus is any one of electromagnetic induction and electromagnetic waves having a predetermined intensity that changes at a predetermined frequency or more.   The tire pressure monitoring system according to claim 9, wherein the physical stimulus is a change in air pressure when air is introduced into a tire of a wheel to which a transmission means to be set is attached.   The said predetermined time interval is short so that transmission of the said wheel information by another transmission means cannot generate | occur | produce during the said predetermined number of times of transmission. The tire pressure monitoring system described.

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