JP4265448B2 - Tire pressure monitoring device - Google Patents

Description

  The present invention belongs to a technical field of a tire pressure monitoring device that determines a mounting position of each tire and individually registers a tire identification code (ID) corresponding to the tire mounting position.

In the automatic ID registration logic of the conventional tire pressure monitoring device, when automatic ID registration is performed, after initial registration of a total of four types of IDs on the front and rear wheels, each time the same ID is received, it is counted up in the ID table and registered When a different ID is received on the receiver side, a learning function is provided for counting in the spare ID table. When the count number in the spare ID table is larger than the maximum count number in the ID table, It is described that ID registration is performed and ID registration is updated (for example, see Patent Document 1).
JP 2000-71726 A

  However, in the conventional tire pressure monitoring device, since there is one receiver that receives ID information transmitted from the tire pressure sensor of each wheel, each position of the four wheels (left front wheel position, right front wheel position) Left rear wheel position, right rear wheel position) and the individual IDs of the four wheels cannot be collated.

  There is no choice but to set a difference in the set pressure of the tires for the four wheels to check the positions of the four wheels and the individual IDs. Therefore, it was troublesome to set the tire pressure during tire replacement or rotation.

  The present invention has been made paying attention to the above problem, and eliminates the troublesome setting of the tire air pressure at the time of tire replacement or rotation, and the reliability of the registration of the tire identification code corresponding to each position of the four wheels. An object of the present invention is to provide a tire pressure monitoring device capable of improving the tire pressure.

In order to achieve the above object, in the present invention, a pressure sensor unit that is attached to each of a plurality of tires mounted on a vehicle and detects each tire air pressure, and at least the detected tire air pressure together with a tire identification code for each tire. A tire pressure detector having a transmitter for transmitting by a radio signal; a receiver attached to the vehicle side for receiving a radio signal from the tire pressure detector; and a tire identification code of each tire to a memory A tire pressure monitoring device comprising:
The reception means is set in the vicinity of each of a plurality of tires by the number of tires, and the reception level measurement means for measuring the reception level by the reception means, the reception level measurement value for each data and the reception level judgment One tire data reception level difference calculating means for calculating a difference from the threshold value, and an integrated value calculating means for calculating an integrated value obtained by integrating the one data reception level difference for a plurality of received data. The means is characterized in that when the integrated value is larger than a preset threshold for determining the integrated level, the corresponding tire identification code is registered.

In the tire pressure monitoring device of the present invention, the vehicle side receiving means is set in the vicinity of each of the plurality of tires by the number of tires. Therefore, when a plurality of tire identification codes are received by each of the set receiving means , the integrated value of the difference between the reception level measurement value and the reception level determination threshold is preset in the tire identification code registration means. When the tire identification code is larger than the threshold for judgment, the corresponding tire identification code is registered, so that the tire corresponding to each position of the four wheels is eliminated while eliminating the troublesome setting of the tire air pressure during tire replacement or rotation. Certainty of identification code registration can be improved.

  Hereinafter, the best mode for carrying out the tire pressure monitoring device of the present invention will be described based on Examples 1 to 3 shown in the drawings.

First, the configuration will be described.
FIG. 1 is an overall view showing a vehicle to which the tire pressure monitoring device of the first embodiment is applied. As shown in FIG. 1, a left front wheel tire 1, a right front wheel tire 2, a left rear wheel tire 3, and a right Rear wheel tire 4, tire pressure sensors A, B, C, D (tire pressure detecting means), tuners with antennas (1), (2), (3), (4) (receiving means), tire pressure An alarm controller 5, a display 6, and a low air pressure warning lamp 7 are provided.

  The tire pressure sensors A, B, C, and D are respectively attached to the load valve positions of the road wheels of the tires 1, 2, 3, and 4 of the front and rear wheels, and detect the tire pressure of each tire individually. The ID (tire identification code) of each tire and the detected pressure data (tire pressure information) are transmitted to the tuners (1), (2), (3), and (4) with antennas by radio signals.

  The antenna-equipped tuners (1), (2), (3), and (4) receive information transmitted from the tire pressure sensors A, B, C, and D, and input them to the tire pressure alarm controller 5.

  The tire pressure alarm controller 5 performs ID registration for each tire, displays tire pressure information of the respective tires 1, 2, 3, and 4 of the front and rear wheels specified by the ID registration on the display 6, and front and rear wheels. When it is determined that at least one of the tire air pressures of the tires 1, 2, 3 and 4 has decreased, a lamp lighting command is output to the air pressure decrease warning lamp 6.

  FIG. 2 is a detailed view showing the tire pressure monitoring device of the first embodiment. The tire pressure sensors A, B, C, and D are a pressure sensor 10a (pressure sensor unit) for detecting tire pressure, and are open (OFF) in a region where the acting centrifugal force is small and closed (ON) in a region where the centrifugal force is large. ), An ASIC 10c that is an application specific integrated circuit, a transmitter 10d, and a transmitting antenna 10e (transmitting unit). Then, with the opening / closing of the centrifugal switch 10b installed to ensure the battery life as a trigger, a long transmission interval (for example, 1 hour) in a region where the vehicle speed including stop is low, and a short in a region where the vehicle speed is higher than that, The transmission cycle is changed into two stages such as a transmission interval (for example, 1 minute).

  As shown in FIG. 2, the tuners with antennas (1), (2), (3), and (4) are connected to a receiving antenna 11a that receives transmission data from the tire pressure sensors A, B, C, and D. And a tuner 11b which is a receiving circuit.

  As shown in FIG. 2, the tire pressure alarm controller 5 receives a 5V power supply circuit 5a, data received from the tuners 11b, performs various information processing, and performs ID registration. EEPROM 5c, which is a dedicated memory capable of electrically erasing stored information, and display drive circuit 5d for outputting a display drive command for displaying tire air pressure information of each tire 1, 2, 3, 4 to display 6 based on the received data And a warning lamp output circuit 5e for judging the pressure value of the tire mounted in the received data and outputting a tire air pressure warning command to the air pressure lowering warning lamp 7 when the pressure drops, and the tire identification code IDn and the integrated value Anm are temporarily stored. And a RAM (random access memory) 5f to be stored.

  Next, the operation will be described.

  [Automatic ID registration process]

Figure 3 is a flowchart showing a flow of the automatic ID registration process of each tire to be executed in the tire air pressure alarm controller 5 of Example 1, hereinafter, each step will be described (tire identification code registration means).

  In step S1, a preset reception level judgment threshold t for one data and an integration level judgment threshold T for one transmission (continuous eight data) are read, and the process proceeds to step S2. To do.

  In step S2, the count number m of the same ID and the count number n of different IDs are respectively set to zero as initial setting values, and the process proceeds to step S3.

  On the condition that the ignition switch is turned on in step S3, it is determined in step S4 whether or not the vehicle speed is 40 km / h or more. If YES, the process proceeds to step S5 based on the determination that the data can be received. In this case, the process returns to step S3.

  In step S5, the tuners with antennas (1), (2), (3), (4) receive data based on the determination that the vehicle speed in step S4 is 40 km / h or higher, and the ID of the received signal And the reception level an is measured, and the process proceeds to step S6 (reception level measurement means).

  In step S6, one data reception level difference (an-t), which is the difference between the reception level measurement value an for each data and the reception level determination threshold t, is calculated, and the process proceeds to step S7 (one data reception). Level difference calculation means).

  In step S7, an integrated value An of 8 data (the number of transmission data continuously sent at one time) of one data reception level difference (an-t) calculated in step S6 is calculated, and the process proceeds to step S8. (Integrated value calculation means).

  In step S8, it is determined whether or not the integrated value An calculated in step S7 exceeds the integrated level determination threshold T. If An ≦ T, the positional relationship between the tuner with the antenna and the tire pressure sensor is determined. If it is determined that the position is not in the vicinity, the process proceeds to step S9. If An> T, it is determined that the positional relationship between the tuner with the antenna and the tire pressure sensor is in the vicinity, and the process proceeds to step S10.

  In step S9, the received data determined that the positional relationship between the tuner with the antenna and the tire pressure sensor in step S8 is not in the vicinity is discarded.

  In step S10, it is determined whether or not the IDn of the received data for which the positional relationship between the tuner with the antenna and the tire pressure sensor is in the vicinity in step S8 is the same as that stored previously. If so, the process proceeds to step S11. If not, the process proceeds to step S16.

  In step S11, based on the determination that the IDn of the received data in step S10 is the same as that previously stored, the count number m of the same IDn is incremented by 1, and the process proceeds to step S12.

  In step S12, the integrated value Anm (An1, An2, An3, An4, etc.) determined by the integrated value An calculated in step S7 and the count number m in step S11 is stored in the RAM 5f, and the process proceeds to step S13.

  In step S13, it is determined whether or not the elapsed time t from the start of storing the integrated value Anm in the RAM 5f has reached a set time (for example, 3 minutes). If NO, the process returns to step S4. If YES, the process returns to step S4. The process proceeds to S14.

  In step S14, for each IDn (ID1, ID2, ID3, ID4, ID5), the sum of the integrated values Anm stored in the RAM 5f is calculated, and the process proceeds to step S15.

  In step S15, the maximum value IDn is registered in the EEPROM 5c among the sum of the integrated values Anm for each IDn calculated in step S14.

  In step S16, the count number n is incremented by 1 based on the determination that the received data IDn is different from the previously stored data in step S10, and the process proceeds to step S17.

  In step S17, IDn based on the count number n determined in step S16 and the integrated value Anm (An1, An2, An3, An4) are stored in the RAM 5f, and the process returns to step S4.

  [Automatic ID registration function]

  FIG. 4 is a diagram showing one-time transmission data from the tire pressure sensors A, B, C, and D of the apparatus of Example 1. In the one-time transmission data, there is no transmission interval as shown in FIG. 8 outgoing data which is a rule is included. That is, 7 adjacent intervals of 8 transmission data are set as 4 sec, 4 sec, 6 sec, 8 sec, 6 sec, 6 sec, 4 sec, for example. One piece of transmission data includes information such as a start bit, function code, ID, pressure data, and checksum.

  FIG. 5 shows the transmission data from the tire pressure sensors A, B, C, and D of the apparatus of the first embodiment, the transmission data of the other vehicle and the wheel at the other position of the own vehicle, and the wheel at the position closest to the tuner with the antenna. It is a figure which shows transmission data.

  Here, for example, when the positions of the tire pressure sensors A, B, C, D and the positions of the tuners with antennas (1), (2), (3), (4) are in the positional relationship shown in FIG. The case where the tuner with antenna (2) receives data from the tire pressure sensors A, B, C, and D will be described as an example.

  When the tuner (2) with the antenna receives data from the tire pressure sensors A, C, and D, it receives data as shown in FIG. It will be. Therefore, when the integrated value An for 8 data is calculated, the level of the received data is small, an−t <0, or close to zero, and the integrated value An for the continuous 8 data is also a positive small value. Or it becomes a negative value. Therefore, in the flowchart of FIG. 3, the flow proceeds from step S1, step S2, step S3, step S4, step S5, step S6, step S7, and step S8. In step S8, the integrated value An is used for determining the integrated level. If it is determined that the threshold value T is equal to or less than the threshold value T, the process proceeds from step S8 to step S9, and among the data received by the tuner with antenna (2) from the tire pressure sensors A, C, D, data determined as An ≦ T. Is destroyed.

  On the other hand, when the tuner (2) with the antenna receives data from the tire pressure sensor B, it receives the data as shown in FIG. 5 (b) because it is the wheel closest to the tuner. Become. Therefore, when the integrated value An for 8 data is calculated, the level of the received data is large, and when an-t> 0, the an-t integrated value An for the continuous 8 data becomes a positive value. Therefore, in the flowchart of FIG. 3, the flow proceeds from step S1, step S2, step S3, step S4, step S5, step S6, step S7, and step S8. In step S8, the integrated value An is used for determining the integrated level. It is determined that the threshold value T has been exceeded, the process proceeds from step S8 to step S10 → step S11 → step S12, and the integrated value Anm is stored in the RAM 5f.

  The above process is repeated until a set time (for example, 3 minutes) elapses in step S13 in the flowchart of FIG. By this repetitive processing, the tire identification code IDn and the integrated value Anm are stored in the RAM 5f, but it is so small that it is based on transmission data from a sensor that is far from the tuner with antenna (2). The integrated value Anm by number is stored.

  For example, as shown in FIG. 6, the integrated values A11, A12, A13 are stored for the tire identification code ID1 of the left front wheel 1, and the integrated values A21, A22, A23, A24 are stored for the tire identification code ID2 of the right front wheel 2. The accumulated values A31 and A32 are stored for the tire identification code ID3 of the left rear wheel 3, the accumulated values A41, A42 and A43 are stored for the tire identification code ID4 of the right rear wheel 4, and the tire identification of the spare tire An integrated value A51 is stored for the code ID5.

  Therefore, in step S13, it is determined that 3 minutes have elapsed, and when the process proceeds to the next step S14 to calculate the sum of the integrated values Anm, (A21 + A22 + A23 + A24) out of the sum of the integrated values Ann for each IDn. ) Is the maximum value, in step S15, the tire identification code of the right front wheel 2 having the tire pressure sensor B closest to the tuner with antenna (2) is automatically registered as ID2.

  Next, the effect will be described.

  (1) A pressure sensor 10a that is attached to each of a plurality of tires 1, 2, 3, and 4 mounted on a vehicle and detects each tire air pressure, and at least the detected tire air pressure is converted into a radio signal together with an ID of each tire Tire pressure sensors A, B, C, and D having a transmitter 10 and a transmitting antenna 10e for transmitting, and attached to the vehicle side, and receiving radio signals from the tire pressure sensors A, B, C, and D. In a tire pressure monitoring device comprising: a receiving means; and a tire identification code registration means for registering the ID of each tire 1, 2, 3, 4 by storing and updating in the EEPROM 5c, the receiving means comprises a plurality of tires 1, The tuners with antennas (1), (2), (3), (4) set to the number of tires in the vicinity positions of 2, 3 and 4 respectively, and the tire identification code registration means When multiple IDs are received by the tuner with antenna (1), (2), (3), (4), the magnitude of the radio wave intensity received at the same time as the ID is compared. Since the tuner with a large antenna is configured to register the received ID, the tire identification code corresponding to each position of the four wheels is surely registered while eliminating the troublesome setting of the tire pressure when changing tires or rotating. Can be improved.

  (2) Reception level measurement step S5 for measuring the reception level an by the tuner with antenna (1), (2), (3), (4), and the reception level measurement value an for each data and the reception level judgment. One data reception level difference calculation step S6 for calculating one data reception level difference (an-t) that is a difference from the threshold value t, and integration by integrating the one data reception level difference (an-t) for a plurality of reception data. An integrated value calculating step S7 for calculating the value An, and the tire identification code registering means registers the corresponding ID when the integrated value An is larger than a preset integrated level determination threshold T. Therefore, even if there is a transmission loss, a reception loss, or the like for some data, the reliability of tire identification code registration can be improved by determining the integrated value.

  (3) When the integrated value An is larger than the integrated level determination threshold T, the tire identification code registration means temporarily stores the tire identification code IDn and the integrated value Anm and stores them within the set time t. Since the total sum of the integrated values Anm is calculated and the tire identification code ID having the maximum total sum of the calculated integrated values Ann is registered, even when the host vehicle runs side by side with an adjacent vehicle that temporarily sends data, The certainty of the tire identification code registration can be improved by the accumulated data judgment.

  In the second embodiment, the tire identification code IDn having the maximum average value is registered by dividing the sum of the accumulated values Anm stored within the set time by the number of received frames, and the tire identification code IDn and the accumulated value Anm are registered. In this example, when there is no remaining storage area in the RAM 5f that temporarily stores the tire identification code data, the tire identification code data having the smallest number of integrated values Anm for each tire identification code IDn is sequentially deleted. In addition, since it is the same as that of Example 1 in another structure, the same code | symbol is attached | subjected to a corresponding structure and description is abbreviate | omitted.

  Next, the operation will be described.

  [Automatic ID registration process]

Figure 7 is a flowchart showing a flow of the automatic ID registration process of each tire to be executed in the tire air pressure alarm controller 5 of Example 2, hereinafter, each step will be described (tire identification code registration means).

  In step S1 ′, an initial set value, a preset threshold t for determining reception level for one data, and a preset threshold T for determining integrated level for one transmission (eight continuous data) The maximum n value nMAX is read, and the process proceeds to step S2.

  Steps S2 to S14 and steps S16 and S17 are the same processing as the corresponding step numbers in the flowchart shown in FIG.

  In step S18, after the count number m of IDn is incremented by 1 in step S11, before storing the integrated value Anm in the RAM 5f in step S12, there is a storage remaining area (buffer) in the RAM 5f that is the storage destination of the integrated value Anm. If YES, the process proceeds to step S12. If NO, the process proceeds to step S19.

  In step S19, based on the determination that there is no storage remaining area in the RAM 5f that is the storage destination of the integrated value Anm in step S18, the count number m of the integrated value Anm for each IDn already stored is compared and stored. The stored information of the tire identification code data (for example, ID5 of m = 1 in the case shown in FIG. 8) having the smallest count m of the integrated value Anm is erased, and the process proceeds to step S12.

  In step S20, the sum of the integrated values Anm stored in the RAM 5f for each IDn calculated in step S14 is divided by the number of received frames to calculate an integrated value average value Anmave in one received frame, Control goes to step S21.

  In step S21, IDn having the maximum integrated value Anmave for each IDn calculated in step S20 is registered in the EEPROM 5c.

  [Automatic ID registration function]

  For example, the positions of the tire pressure sensors A, B, C and D and the positions of the tuners with antennas (1), (2), (3) and (4) are in the positional relationship shown in FIG. When (2) receives data from the tire pressure sensors A, B, C, D, it should receive the data shown in Fig. 5 (b) because it is the wheel closest to the tuner. become. Therefore, when the integrated value An for 8 data is calculated, the level of the received data is large, and when an-t> 0, the an-t integrated value An for the continuous 8 data becomes a positive value. Therefore, in the flowchart of FIG. 7, the process proceeds from step S1 ′ → step S2 → step S3 → step S4 → step S5 → step S6 → step S7 → step S8. In step S8, the integrated value An is determined as the integrated level determination. Therefore, the process proceeds from step S8 to step S10 to step S11.

  In step S12, before storing the integrated value Anm in the RAM 5f, it is determined in step S18 whether or not there is a storage remaining area in the RAM 5f that is the storage destination of the integrated value Anm. If there is a remaining storage area in the RAM 5f, the process proceeds to step S12 as it is, but if there is no remaining storage area in the RAM 5f, the process proceeds to step S19, and in step S19, the integrated value for each IDn already stored. The Anm count number m is compared, the stored information of the tire identification code data having the smallest stored count value m of the integrated value Anm is deleted, and the process proceeds to Step S12. In Step S12, the stored information is deleted. The integrated value Anm is stored in the storage area of the free RAM 5f.

  The above processing is repeated until a set time (for example, 3 minutes) elapses in step S13 in the flowchart of FIG. As a result of this repeated processing, the tire identification code IDn and the integrated value Anm are stored in the RAM 5f. However, the more the transmission data from the sensor having a close positional relationship with the tuner with antenna (2), the more it is. Therefore, the smaller the number, the more the integrated value Anm is stored, which is based on the transmission data from the sensors in a distant positional relationship.

  For example, as shown in FIG. 8, the integrated values A11, A12, A13 are stored for the tire identification code ID1 of the left front wheel 1, and the integrated values A21, A22, A23, A24 are stored for the tire identification code ID2 of the right front wheel 2. The accumulated values A31, A32 are stored for the tire identification code ID3 of the left rear wheel 3, and the accumulated values A41, A42, A43 are stored for the tire identification code ID4 of the right rear wheel 4. For the tire identification code ID5 of the spare tire, if it is determined in step S18 that there is no storage remaining area in the RAM 5f that is the storage destination of the integrated value Anm, the stored integrated value A51 is deleted. Become.

  Therefore, in step S13, it is determined that 3 minutes have elapsed, the process proceeds to the next step S14, and the sum of the integrated values Anm is calculated. In step S20, the sum of the integrated values Anm is divided by the number of received frames, and the integrated value average value Amave Is calculated, (A21 + A22 + A23 + A24) / 32 of each IDn is the maximum value (No. 1), so in step S21, the tire pressure sensor B closest to the tuner with antenna (2) is obtained. The tire identification code of the right front wheel 2 having is automatically registered as ID2.

Next, the effect will be described.
In the tire pressure monitor apparatus according to the second embodiment, the (1) Embodiment 1, can be obtained in addition to the effects listed below effect of (2).

  (4) When the integrated value An is greater than the integrated level determination threshold T, the tire identification code registration means temporarily stores the tire identification code IDn and the integrated value Anm, and is stored within the set time t. The integrated value average value Anmave is calculated by dividing the total sum of the integrated value Anm by the number of received frames, and the calculated integrated value average value Anmave registers the tire identification code ID having the maximum value. Even when another vehicle to be transmitted and the host vehicle run adjacent to each other temporarily, the accumulated value average value Anmave indicates the magnitude of the radio field intensity in the received frame unit, so that the tire identification code can be registered reliably. Can be improved.

  (5) The tire identification code registration means is a case where the tire identification code IDn and the integrated value Anm are temporarily stored, and if there is no storage remaining area in the temporarily stored RAM 5f, the tire already stored The number of accumulated values Anm for each identification code IDn is compared, and the tire identification code data with the smallest number of accumulated values Anm is erased. Therefore, when there is no remaining storage area in the RAM 5f, it is saved at that time. The tire identification code data having the smallest number of integrated values Anm are deleted in order, and the reliability of tire identification code registration is not impaired while the storage capacity of the RAM 5f is kept small.

  The third embodiment is basically the same as the second embodiment, but when there is no remaining storage area in the RAM 5f that temporarily stores the tire identification code IDn and the integrated value Anm, the tire identification code that has already been stored is stored. This is an example in which tire identification code data having the lowest sum of integrated values Anm for each IDn is deleted in order. In addition, since it is the same as that of Example 1 in another structure, the same code | symbol is attached | subjected to a corresponding structure and description is abbreviate | omitted.

  Next, the operation will be described.

  [Automatic ID registration process]

Figure 9 is a flowchart showing a flow of the automatic ID registration process of each tire to be executed in the tire air pressure alarm controller 5 of Example 3, below, each step will be described (tire identification code registration means).

  In step S22, based on the determination that there is no remaining storage area in the RAM 5f that is the storage destination of the integrated value Anm in step S18, the total sum of the integrated values Anm for each IDn that has already been stored is compared and stored. The storage information of the tire identification code data having the lowest sum of the integrated values Anm is deleted, and the process proceeds to step S12.

  Steps other than step S22 are the same as the corresponding steps in the flowchart shown in FIG.

  [Automatic ID registration function]

  Only the parts different from the second embodiment will be described. In step S12, before storing the integrated value Anm in the RAM 5f, it is determined in step S18 whether or not there is a storage remaining area in the RAM 5f that is the storage destination of the integrated value Anm. If there is a remaining storage area in the RAM 5f, the process proceeds to step S12 as it is. If there is no remaining storage area in the RAM 5f, the process proceeds to step S22. In step S22, the integrated value for each IDn already stored. The sums of Anm are compared, the stored information of the tire identification code data having the lowest sum of accumulated values Anm is deleted, and the process proceeds to step S12. In step S12, the RAM 5f that has become free due to the deletion of the stored information is stored. The integrated value Anm is stored in the storage area.

Next, the effect will be described.
In the tire pressure monitor apparatus according to the third embodiment, in Example 1 (1), the effect of (2), and, in addition to the effects of Example 2 (4), to obtain the following effects it can.

  (6) The tire identification code registration means is a case where the tire identification code IDn and the integrated value Anm are temporarily stored, and when there is no remaining storage area in the temporarily stored RAM 4f, the tire already stored The total sum of the integrated values Anm for each identification code IDn is compared, and the stored sum of the integrated values Anm is deleted in order from the tire identification code data having the lowest sum. Therefore, when there is no remaining storage area in the RAM 5f, it is stored at that time. The tire identification code data having the lowest sum of integrated values Anm are deleted in order, and the reliability of tire identification code registration is not impaired while the storage capacity of the RAM 5f is kept small.

  As mentioned above, although the tire pressure monitoring apparatus of the present invention has been described based on the first to third embodiments, the specific configuration is not limited to these embodiments, and each claim of the claims Modifications and additions of the design are permitted without departing from the gist of the present invention described in the above.

  For example, in the first embodiment, the example in which the corresponding tire identification code ID is registered when the total sum of the accumulated values Anm stored within the set time t is the maximum is shown, but it is stored within the set number of transmissions. When the total sum of the integrated values Anm is the maximum, the corresponding tire identification code ID may be registered.

In the embodiment, although the tire pressure monitor system for a vehicle equipped with four tires such as a passenger car, tire pressure monitor apparatus in a large vehicle equipped with a small vehicle and five or more tires equipped with three tires It can also be applied.

1 is an overall view showing a vehicle to which a tire pressure monitoring device according to a first embodiment is applied. 1 is a detailed view showing a tire pressure monitoring device of Example 1. FIG. It is a flowchart which shows the flow of the automatic ID registration process of each tire performed with the tire pressure warning controller of Example 1. FIG. It is a figure which shows the one time transmission data from the tire pressure sensors A, B, C, D of Example 1. FIG. 3 is a diagram illustrating an example of received data received by the tuner with an antenna according to the first embodiment. It is a figure which shows the example of the preservation | save data in RAM of the tire pressure alarm controller of Example 1. FIG. It is a flowchart which shows the flow of the automatic ID registration process of each tire performed with the tire pressure warning controller of Example 2. FIG. It is a figure which shows the example of the preservation | save data in RAM of the tire pressure alarm controller of Example 2. FIG. It is a flowchart which shows the flow of the automatic ID registration process of each tire performed with the tire pressure warning controller of Example 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Left front wheel tire 2 Right front wheel tire 3 Left rear wheel tire 4 Right rear wheel tire A, B, C, D Tire pressure sensor (tire pressure detection means)
(1), (2), (3), (4) Tuner with antenna (reception means)
5 Tire pressure alarm controller 5c EEPROM
5f RAM
6 Display 7 Low air pressure warning lamp 10a Pressure sensor (pressure sensor)
10b Centrifugal switch 10c ASIC
10d transmitter (transmitter)
10e Transmitting antenna (transmitting unit)
11a receiving antenna 11b tuner

Claims (5)

A pressure sensor unit that is attached to each of a plurality of tires mounted on a vehicle and detects each tire air pressure, and a transmitting unit that transmits at least the detected tire air pressure together with a tire identification code for each tire by a radio signal, Tire pressure detecting means having
A receiving means mounted on the vehicle side for receiving a radio signal from the tire pressure detecting means;
Tire identification code registration means for registering the tire identification code of each tire by storage update to a memory;
In a tire pressure monitoring device equipped with
The receiving means is set in the vicinity of each of a plurality of tires by the number of tires,
A reception level measuring means for measuring a reception level by the receiving means;
1 data reception level difference calculating means for calculating a difference between a reception level measurement value for each data and a reception level determination threshold;
An integrated value calculation means for calculating an integrated value obtained by integrating one data reception level difference for a plurality of received data;
The tire pressure monitoring device is characterized in that , when the integrated value is larger than a preset threshold for determining integrated level, the corresponding tire identification code is registered. In the tire pressure monitoring device according to claim 1 ,
The tire identification code registration means temporarily stores the tire identification code and the integrated value when the integrated value is larger than the threshold for determining the integrated level, and the integrated value stored within the set time or the set number of transmissions. The tire pressure monitoring device is characterized by registering a tire identification code having a maximum integrated value calculated. In the tire pressure monitoring device according to claim 1 ,
The tire identification code registration means temporarily stores the tire identification code and the integrated value when the integrated value is larger than the threshold for determining the integrated level, and the integrated value stored within the set time or the set number of transmissions. The tire pressure monitoring device is characterized in that an average value is calculated by dividing the sum of the two by the number of received frames, and a tire identification code having a maximum calculated average value is registered. The tire air pressure monitor apparatus according to claim 2 or claim 3,
The tire identification code registration means is a case where the tire identification code and the integrated value are temporarily stored, and if there is no storage remaining area in the temporarily stored memory, the integration for each tire identification code already stored comparing the number of values, a tire pressure monitor and wherein the number of accumulated values stored erases the least tire identification code data. The tire air pressure monitor apparatus according to claim 2,
The tire identification code registration means is a case where the tire identification code and the integrated value are temporarily stored, and if there is no storage remaining area in the temporarily stored memory, the integration for each tire identification code already stored compares the sum of values, tire pressure monitor apparatus characterized by sum of the integrated values stored erases the lowest tire identification code data.

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