JP2010264877A - Method for determining abnormality of wheel position detection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology capable of enhancing the accuracy of the result of detection in a wheel position detection system. <P>SOLUTION: In a method for determining abnormality of a wheel position detection system comprising a transmitter for transmitting wheel position information by radio, a receiver 12, a trigger signal transmitter 8, and a TPMS (Tire Pressure Monitoring System)-ECU 14 for executing the wheel position detection to determine from which wheel the signal received by the receiver 12 is obtained based on wheel position information, the transmitter ID is stored in the predetermined wheel order to prepare the inspection standard with the wheel position corresponding to the transmitter ID, the transmitter ID and the wheel position information are transmitted from the transmitter, the wheel position detection for detecting the wheel position based on the wheel position information is executed, the transmitter ID is stored in the wheel order based on the detected wheel position, the result of detection of the wheel position is prepared, and the inspection standard is compared with the result of detection to determine whether or not the wheel position detection is correctly executed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an abnormality determination method for a wheel position detection system, and more particularly to an abnormality determination method for a wheel position detection system applied to a tire pressure monitoring system.

  In recent years, in order to realize safer vehicle driving, tire pressure monitoring system (TPMS: Tire Pressure Monitoring System) has been developed to notify the driver by wirelessly transmitting information such as tire pressure and temperature to the vehicle body. It has been. In such a tire pressure monitoring system, a wheel state detection unit that detects a wheel state such as tire pressure is provided for each wheel. The wheel state detection unit wirelessly transmits information about the detected wheel state to the vehicle body side. The transmitted wheel state information is received by the receiver on the vehicle body side and sent to the TPMS-ECU. In the TPMS-ECU, the quality of the tire pressure is determined based on the received wheel state information, and the determination result is displayed on the instrument panel. Or on the navigation system display.

  In such a tire pressure monitoring system, it has been desired that the received wheel information can be distinguished from which wheel state detection unit is provided on which wheel. On the other hand, a wheel position detection system that transmits identification information unique to each wheel together with wheel information from the wheel state detection unit and that can determine which wheel the received wheel information relates to based on the identification information is known. (For example, refer to Patent Document 1, 3, or 4). Moreover, the example which applied the same wheel position detection system to the tire rotation judgment apparatus is known (for example, refer patent document 2).

JP-A-2005-50025 JP 2007-112169 A JP 2004-155352 A JP 2004-58964 A

  With respect to the wheel position detection system described above, there is always a demand to detect the wheel position accurately.

  This invention is made | formed in view of such a condition, The place made into the objective is to provide the technique which improves the accuracy of the detection result in a wheel position detection system.

  In order to solve the above problems, an aspect of the present invention is an abnormality determination method for a wheel position detection system. The abnormality determination method is provided for each of a plurality of wheels and transmits a signal including wheel position information wirelessly, a receiver provided on the vehicle body side for receiving the signal, and the transmitter A trigger signal transmitter for transmitting a trigger signal for transmitting the signal, and a trigger signal transmitter for controlling the trigger signal transmitter to transmit the signal to the transmitter, to which wheel the signal received by the receiver belongs. And a wheel position detection system abnormality determination method comprising: a control unit that performs wheel position detection that is determined based on the received wheel position information, wherein identification information that each of the plurality of transmitters has is determined in advance. A step of generating an inspection standard in which wheel positions and identification information are associated with each other, the trigger signal is transmitted from the trigger signal transmitter, and the identification information and the vehicle are transmitted from the transmitter. A wheel position detection that detects a wheel position based on the transmitted wheel position information, and stores identification information transmitted based on the detected wheel position in the order of the wheels. And generating a detection result of wheel position detection, and comparing the inspection standard with the detection result to determine whether or not the wheel position detection has been performed normally. And

  According to the abnormality determination method for the wheel position detection system of this aspect, the accuracy of the detection result in the wheel position detection system can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which improves the accuracy of the detection result in a wheel position detection system can be provided.

It is a figure which shows schematic structure of the vehicle provided with the tire pressure monitoring system which employ | adopted the wheel position detection system which concerns on Embodiment 1 and 2. FIG. It is a schematic sectional drawing of a wheel. It is a block diagram which shows schematic structure of a tire pressure monitoring system. It is a flowchart of the abnormality determination method of the wheel position detection system which concerns on Embodiment 1. FIG. 5 is a flowchart of an abnormality determination method for a wheel position detection system according to a second embodiment. It is a figure which shows schematic structure of the vehicle provided with the tire pressure monitoring system which employ | adopted the wheel position detection system which concerns on a modification.

  Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate.

(Embodiment 1)
FIG. 1 is a diagram illustrating a schematic configuration of a vehicle including a tire air pressure monitoring system that employs a wheel position detection system according to a first embodiment. FIG. 2 is a schematic sectional view of the wheel. FIG. 3 is a block diagram showing a schematic configuration of the tire pressure monitoring system.

  As shown in FIG. 1, the vehicle body 1 of the vehicle 100 includes four traveling wheels for driving the vehicle 100 by being installed on the road surface and rotating, a left front wheel 2FL, a right front wheel 2FR, a right rear wheel 2RR, and a left rear wheel. 2RL (hereinafter referred to as “wheel 2” as appropriate) is provided. In addition, a spare tire 2SP is mounted on the vehicle body 1 in case an abnormality occurs in any of the wheels 2. The position where the spare tire 2SP is mounted is, for example, the rear door of the vehicle body 1 or the lower part of the trunk room.

  As shown in FIG. 2, the wheel 2 includes a tire 22 and a wheel 24. A wheel rim 26 formed in a cylindrical shape is provided on the outer periphery of the wheel 24, and the tire 22 is assembled on the outer periphery of the wheel rim 26. Thus, a tire air chamber is formed in a region surrounded by the inside of the tire 22 and the outer periphery of the wheel rim 26.

  As shown in FIGS. 1 and 3, the tire pressure monitoring system 200 includes a wheel state detection unit 6a, 6b, 6c, 6d, 6sp (hereinafter, collectively referred to as “wheel state detection unit 6” as appropriate) and a trigger signal. Transmitters 8a and 8b (hereinafter collectively referred to as “trigger signal transmitter 8” as appropriate), trigger signal transmitter drive unit 10, receiver 12, TPMS-ECU 14, display unit 16, and connector unit 18 And comprising.

  The wheel state detection unit 6 is provided in each of the four wheels 2 and the spare tire 2SP. Specifically, the left front wheel 2FL has a wheel state detection unit 6a, the right front wheel 2FR has a wheel state detection unit 6b, the right rear wheel 2RR has a wheel state detection unit 6c, and the left rear wheel 2RL has a wheel state. A detection unit 6d and a wheel state detection unit 6sp are attached to the spare tire 2SP, respectively.

  As shown in FIG. 2, the wheel state detection unit 6 of the present embodiment has a shape in which a transmission unit 62 and a tire valve unit 64 are integrated. The transmission unit 62 is fixed to one end of the tire valve unit 64. The wheel state detection unit 6 is attached to the wheel 2 by fixing the tire valve portion 64 to the wheel rim 26. The configuration of the wheel state detection unit 6 is not particularly limited to this.

  The transmission unit 62 includes wheels such as an air pressure sensor that detects the air pressure of the tire chamber as a wheel state (hereinafter referred to as “tire air pressure” as appropriate) and a temperature sensor that detects the temperature of the tire chamber as a wheel state. A sensor (not shown) for detecting the state of The transmission unit 62 includes a transmitter (not shown) that wirelessly transmits the wheel state detected by the sensor as wheel state information. The transmitter receives a trigger signal described later from the trigger signal transmitter 8 and transmits wheel state information. Moreover, a transmitter transmits the signal containing the information (wheel position information) regarding the reception intensity | strength of a trigger signal with a wheel state information on radio.

  The transmitter is given identification information of each transmitter (hereinafter referred to as a transmitter ID as appropriate), and the transmitter can transmit the transmitter ID. The transmission unit 62 includes a data processing unit that processes the detection value of the sensor, a battery for supplying power to each device included in the transmission unit 62, and the like.

  Returning to FIG. 1 and FIG. 3, the trigger signal transmitter 8 is provided at a predetermined position of the vehicle body 1 and is connected to the trigger signal transmitter drive unit 10. The trigger signal transmitter 8 can transmit a trigger signal on the LF (Low Frequency) signal to the wheel state detection unit 6. In this embodiment, two trigger signal transmitters 8a and 8b are attached to the vehicle body 1, the trigger signal transmitter 8a transmits a trigger signal to the wheel state detection units 6a and 6b, and the trigger signal transmitter 8b detects the wheel state. A trigger signal is transmitted to the units 6c and 6d. The trigger signal transmitter 8a is disposed in the vehicle body 1 such that the distance to the wheel state detection unit 6a is different from the distance to the wheel state detection unit 6b. The trigger signal transmitter 8b is connected to the wheel state detection unit 6c. The vehicle body 1 is disposed such that the distance and the distance to the wheel state detection unit 6d are different.

  The trigger signal transmitter drive unit 10 is provided in the vehicle body 1 and is connected to the trigger signal transmitter 8 and the TPMS-ECU 14. The trigger signal transmitter drive unit 10 turns the trigger signal transmitter 8 on and off in response to a trigger signal transmission instruction from the TPMS-ECU 14. When the trigger signal transmitter drive unit 10 turns on the trigger signal transmitter 8, a trigger signal is transmitted from the trigger signal transmitter 8, and when the trigger signal transmitter 8 is turned off, the trigger signal is transmitted from the trigger signal transmitter 8. Stopped.

  The receiver 12 is provided in the vehicle body 1 and is connected to the TPMS-ECU 14. The receiver 12 receives the signal transmitted from the wheel state detection unit 6, demodulates it into data that can be read by the TPMS-ECU 14, and transmits it to the TPMS-ECU 14.

  The TPMS-ECU 14 (control unit) is configured as a microprocessor including a CPU, an arithmetic unit that performs operations by the microcomputer, a ROM that stores various processing programs, a temporary storage of data and programs, and data storage And a RAM used as a work area for program execution, an input / output port for transmitting and receiving various signals, and the like.

  The TPMS-ECU 14 compares the tire air pressure value received from the receiver 12 with the air pressure warning threshold value stored in the storage unit 142 and monitors the tire air pressure of each wheel 2. Further, the TPMS-ECU 14 compares the transmitter ID received from the receiver 12 and the information related to the reception intensity of the trigger signal with the transmitter ID registered in advance, and performs an abnormality determination of the wheel position detection. . The TPMS-ECU 14 can execute a tire pressure monitoring mode and a transmitter ID registration mode, and the TPMS-ECU 14 transmits a trigger signal by sending a trigger signal transmission instruction to the trigger signal transmitter drive unit 10 in the air pressure monitoring mode. The machine 8 is driven and the tire pressure is monitored at an arbitrary timing. Further, the TPMS-ECU 14 performs the abnormality determination of the wheel position detection described above in the transmitter ID registration mode.

  Here, the transmitter ID registration mode is mounted on the wheel 2 of the host vehicle in order to distinguish the transmitter included in the wheel state detection unit 6 mounted on each wheel 2 of the host vehicle from the transmitter of the other vehicle. It is a mode for performing the operation | work which writes the identification information of the transmitted transmitter in TPMS-ECU14. This transmitter ID registration mode is normally executed using a dedicated registration device in a factory or a store.

  The display unit 16 is disposed at a location that can be visually recognized by the driver, such as an instrument panel in the vehicle compartment. The display unit 16 is connected to the TPMS-ECU 14 and displays information on the screen according to display data output from the TPMS-ECU 14. The display unit 16 can display, for example, a warning lamp display 16a, a wheel position-specific air pressure display 16b, and the like.

  The connector unit 18 is a connector to which a device for registering the transmitter ID in the TPMS-ECU 14 is connected when registering the transmitter ID in the TPMS-ECU 14.

  The wheel position detection system according to the present embodiment includes a wheel state detection unit 6, a trigger signal transmitter 8, a trigger signal transmitter drive unit 10, a receiver 12, and a TPMS-ECU 14. This wheel position detection system is a system that associates wheel position information and wheel state information received from a transmitter.

  Next, the tire pressure monitoring operation by the tire pressure monitoring system 200 having such a configuration will be described. In a state where the tire pressure monitoring mode is set, the TPMS-ECU 14 sends a trigger signal transmission instruction to the trigger signal transmitter drive unit 10. When receiving the trigger signal transmission instruction, the trigger signal transmitter drive unit 10 turns on the trigger signal transmitter 8. As a result, a trigger signal is transmitted from the trigger signal transmitter 8.

  On the other hand, the wheel state detection unit 6 detects the tire air pressure and the tire air chamber temperature of the attached wheel 2 to generate wheel state information. When the wheel state detection unit 6 receives the trigger signal from the trigger signal transmitter 8, the wheel state detection unit 6 transmits wheel state information and information related to the reception intensity of the trigger signal. The receiver 12 receives these signals wirelessly transmitted from the wheel state detection unit 6, performs predetermined processing, and then sends the signals to the TPMS-ECU 14.

  The TPMS-ECU 14 compares the tire air pressure value included in the acquired wheel state information with the air pressure warning threshold value stored in the storage unit 142. Further, the TPMS-ECU 14 performs wheel position detection for determining which wheel 2 the acquired wheel state information is from the received intensity information of the acquired trigger signal. When an abnormality is recognized in the tire air pressure of the wheel 2, the TPMS-ECU 14 gives a warning to the driver by performing a warning light display 16 a and a wheel position-specific air pressure display 16 b on the display unit 16.

  Then, the abnormality determination method of the wheel position detection system according to the present embodiment will be described in detail. The abnormality determination of the wheel position detection system is performed, for example, in a state where the transmitter ID registration mode is set.

  First, the transmitter ID of each transmitter of each wheel state detection unit 6 is input to the TPMS-ECU 14. For example, a transmitter ID registration device is connected to the connector unit 18, and the transmitter ID is input by the transmitter ID registration device. The transmitter ID information input to the TPMS-ECU 14 is stored in the address A 142a of the storage unit 142. At this time, the transmitter ID is registered in the address A 142a of the storage unit 142 in the order of a predetermined wheel, in this embodiment, the left front wheel 2FL, the right front wheel 2FR, the right rear wheel 2RR, and the left rear wheel 2RL in this order. . Thus, since transmitter ID is memorize | stored in the determined wheel order, transmitter ID memorize | stored in address A142a is transmitter ID matched (correlated) with the correct wheel position, this book Used as inspection standard for abnormality determination method.

  Subsequently, the TPMS-ECU 14 causes the trigger signal transmitter 8 to transmit a trigger signal. The wheel state detection unit 6 that has received the trigger signal transmits the reception intensity information of the trigger signal and the transmitter ID to the TPMS-ECU 14. The wheel state detection unit 6 is set to transmit the reception intensity information of the trigger signal and the transmitter ID when receiving the trigger signal in the transmitter ID registration mode. These pieces of information transmitted from the wheel state detection unit 6 are received by the receiver 12 and sent to the TPMS-ECU 14.

  The TPMS-ECU 14 performs wheel position detection that determines from which wheel the signal is based on the received intensity information of the trigger signal received by the receiver 12. Then, based on the wheel position detected by the wheel position detection, the same wheel order as when the transmitter ID is input, that is, the left front wheel 2FL, the right front wheel 2FR, the right rear wheel 2RR, and the left rear wheel 2RL in this order, Each transmitter ID is stored in the address B 142 b of the storage unit 142. Thus, since transmitter ID is memorize | stored in order of the wheel determined based on the result of wheel position detection, transmitter ID memorize | stored in address B142b is transmitter ID matched with the detected wheel position. And it is used as a detection result of wheel position detection.

  Then, the TPMS-ECU 14 compares the transmitter IDs stored in the addresses A 142a and B 142b in the same stored order. Since the transmitter IDs are registered in the same wheel order as the inspection standard and the detection result, both transmitter IDs should match if the wheel position is detected normally. Therefore, as a result of the comparison, the TPMS-ECU 14 determines that the wheel position detection is normally performed when the transmitter IDs match, and performs the wheel position detection normally when the transmitter IDs do not match. Judge that it was not.

  Below, the flow of the abnormality determination method of the wheel position detection system which concerns on this embodiment is demonstrated. FIG. 4 is a flowchart of the abnormality determination method for the wheel position detection system according to the first embodiment. This flow is executed by the TPMS-ECU 14, and is started, for example, when the mode is switched to the transmitter ID registration mode.

  First, in the order of the left front wheel 2FL, the right front wheel 2FR, the right rear wheel 2RR, and the left rear wheel 2RL, the transmitter ID of the transmitter of the wheel state detection unit 6 provided on each wheel is input to the TPMS-ECU 14. (Step 1: hereinafter abbreviated as S1. The same applies to other steps). Subsequently, the input transmitter IDs are stored in the address A 142a of the storage unit 142 in the input order (S2). Thereby, the inspection standard of this abnormality determination method is created.

  Subsequently, wheel position detection is performed (S3). Specifically, a trigger signal is transmitted from the trigger signal transmitter 8, and a signal including the reception intensity information of the trigger signal and the transmitter ID is transmitted from the transmitter. The TPMS-ECU 14 detects the wheel position from the received intensity information of the received trigger signal. Then, the wheel position detected by the wheel position detection is associated with the corresponding transmitter ID (S4), and the transmitter ID associated with the detected wheel position is the left front wheel 2FL, the right front wheel 2FR, They are stored in the address B142b of the storage unit 142 in the order of the right rear wheel 2RR and the left rear wheel 2RL (S5).

  Subsequently, the transmitter ID stored in the address A 142a and the transmitter ID stored in the address B 142b are compared with each other in the stored order (S6). Then, it is determined whether or not the transmitter ID of the address A 142a matches the transmitter ID of the address B 142b (S7). If the transmitter IDs match (S7_Yes), it is determined that the wheel position has been detected normally (S8), and this flow ends. If the transmitter IDs do not match (S7_No), it is determined that the wheel position detection is abnormal (S9), the warning lamp is turned on (S10), and the flow ends.

  Summarizing the operational effects of the configuration described above, in the abnormality determination method of the wheel position detection system according to the present embodiment, transmitter IDs are stored in the order of predetermined wheels, and wheel positions and transmitter IDs are associated with each other. Inspection standards are created. Moreover, based on the wheel position detected by wheel position detection, transmitter ID is memorize | stored in the same wheel order, and the detection result of wheel position detection is created. Then, the inspection standard and the detection result are compared, and it is determined whether or not the wheel position has been detected normally. As described above, in the abnormality determination method for the wheel position detection system according to the present embodiment, the transmitter IDs are stored in the order of the determined wheels and the inspection standard is created. Therefore, the abnormality determination of the wheel position detection system is accurately performed. be able to. As a result, the accuracy of the detection result in the wheel position detection system can be improved.

  Further, when adopting the abnormality determination method of the present embodiment, only the change of registering the transmitter ID in the order of the determined wheels is added in the transmitter ID registration work that has been conventionally performed. Therefore, the burden on the worker that increases due to the implementation of the abnormality determination method of the present embodiment is small, and it is not necessary to add new equipment or equipment. Further, the tire pressure monitoring system 200 alone can carry out the abnormality determination method of the present embodiment, and whether or not the abnormality determination method can be performed does not depend on the presence or absence of other components, etc. It is possible to increase the working efficiency of abnormality determination.

  Furthermore, according to the abnormality determination method of this embodiment, the air pressure of each wheel is changed to a predetermined value, and it is visually confirmed whether or not the air pressure of the corresponding wheel displayed on the display unit has changed to the same value. Compared to the conventional abnormality determination method, the time required for abnormality determination and the man-hours can be reduced. Further, according to the abnormality determination method of the present embodiment, it is not necessary to prepare a device such as a compressor or an air pressure gauge. Moreover, in the abnormality determination method of this embodiment, wheel position information can be acquired at arbitrary timings by transmitting a trigger signal at the time of position detection and prompting the transmitter to transmit a signal. Therefore, the time required for position detection is shortened, and accordingly, the time required for determining the abnormality of the wheel position detection system is also shortened, leading to a reduction in work time in a factory or a store.

(Embodiment 2)
In the first embodiment, the transmitter IDs are registered in the order of the determined wheels, thereby associating the correct wheel position with the transmitter ID. However, in the wheel position detection system according to the second embodiment, the transmitter ID is changed. The first embodiment is different from the first embodiment in that the registration is performed without specifying the order, and then the transmitter ID is forcibly transmitted in the order of the determined wheels, thereby associating the accurate wheel position and the transmitter ID. Hereinafter, this embodiment will be described. The configurations of the wheel position detection system and the tire pressure monitoring system are basically the same as those in the first embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

  In the vehicle position detection system of the present embodiment, the storage unit 142 has an address A 142a, an address B 142b, and an address C (not shown) as storage areas. Then, the transmitter ID of the transmitter of each wheel state detection unit 6 is stored in the address A 142a without specifying the order. Further, a transmitter ID (not shown) capable of transmitting a trigger signal, which is different from the trigger signal transmitter 8 provided in the vehicle body 1, forcibly transmits transmitter IDs in the order of predetermined wheels, and addresses A142a. The transmitter IDs stored in are rearranged in the order of the wheels and stored in the address B 142b. In the present embodiment, the transmitter IDs are forcibly transmitted in the order of predetermined wheels to store the transmitter IDs in the order of predetermined wheels, thereby associating the correct wheel position with the transmitter ID (string Create inspection standards).

  Further, based on the wheel position detected by the wheel position detection, the transmitters are arranged in the same wheel order as when the inspection standard was created, that is, the left front wheel 2FL, the right front wheel 2FR, the right rear wheel 2RR, and the left rear wheel 2RL in this order. The ID is registered at address C.

  Then, the TPMS-ECU 14 compares the transmitter IDs stored in the addresses B 142b and C with the same stored order, and determines whether or not the wheel position detection has been normally performed. To do.

  FIG. 5 is a flowchart of the abnormality determination method for the wheel position detection system according to the second embodiment. First, the transmitter ID of the transmitter of the wheel state detection unit 6 provided on each wheel 2 is input to the TPMS-ECU 14 without determining the order (S21). Subsequently, the input transmitter ID is stored in the address A 142a of the storage unit 142 (S22). Subsequently, wheel position detection is performed (S23). Then, the wheel position detected by the wheel position detection and the corresponding transmitter ID are associated (S24), and the transmitter ID associated with the detected wheel position is the left front wheel 2FL, the right front wheel 2FR, They are stored in the address C of the storage unit 142 in the order of the right rear wheel 2RR and the left rear wheel 2RL (S25).

  Subsequently, the transmitter ID is forcibly transmitted in the order of the left front wheel 2FL, the right front wheel 2FR, the right rear wheel 2RR, and the left rear wheel 2RL (S26). Specifically, a trigger signal that is different from the trigger signal transmitter 8 provided in the vehicle body 1 and capable of transmitting a trigger signal is transmitted to the wheel state detection unit 6 in the order of the determined wheels. Transmitter IDs are transmitted in the order of the determined wheels. Then, the correct wheel position and the corresponding transmitter ID are linked (S27), and the transmitter ID linked to the correct wheel position is the left front wheel 2FL, the right front wheel 2FR, the right rear wheel 2RR, and the left rear wheel. 2RL is stored in the address B142b of the storage unit 142 (S28). Thereby, the inspection standard of this abnormality determination method is created.

  Subsequently, the transmitter ID stored in the address B 142b and the transmitter ID stored in the address C are compared with each other in the stored order (S29). Then, it is determined whether or not the transmitter ID of the address B 142b matches the transmitter ID of the address C (S30). If the transmitter IDs match (S30_Yes), it is determined that wheel position detection has been performed normally (S31), and this flow ends. If the transmitter IDs do not match (S30_No), it is determined that the wheel position detection is abnormal (S32), the warning lamp is turned on (S33), and this flow ends.

  The effects similar to those of the first embodiment can also be obtained by the abnormality determination method for the wheel position detection system according to the second embodiment described above.

  The present invention is not limited to the above-described embodiment, and an appropriate combination of the elements of the embodiment is also effective as an embodiment of the present invention. Various modifications such as design changes can be added to the embodiments based on the knowledge of those skilled in the art, and the embodiments to which such modifications are added can be included in the scope of the present invention. . The configuration shown in each figure is for explaining an example, and any configuration that can achieve the same function can be changed as appropriate, and the same effect can be obtained.

  For example, in Embodiment 1 and Example 2, two trigger signal transmitters 8a and 8b are attached to the vehicle body 1, the trigger signal transmitter 8a transmits a trigger signal to the wheel state detection units 6a and 6b, and a trigger signal is transmitted. Although the machine 8b is configured to transmit the trigger signal to the wheel state detection units 6c and 6d, the trigger signal transmitter 8 may be provided for each wheel state detection unit 6 one by one. FIG. 6 is a diagram illustrating a schematic configuration of a vehicle including a tire pressure monitoring system that employs a wheel position detection system according to a modification. As shown in FIG. 6, the vehicle body 1 is provided with four trigger signal transmitters 8 corresponding to the respective wheel state detection units 6. Specifically, a trigger signal transmitter 8a is provided for the wheel state detection unit 6a, a trigger signal transmitter 8d is provided for the wheel state detection unit 6b, and a trigger signal transmitter 8c is provided for the wheel state detection unit 6c. A trigger signal transmitter 8b is provided for each wheel state detection unit 6d. Since the other configuration shown in FIG. 6 is the same as that of the first embodiment, the description thereof is omitted.

  By taking the configuration of the modified example, the accuracy of the detection result in the wheel position detection system can be further increased. However, when desired accuracy can be obtained with two trigger signal transmitters 8 as in the first embodiment, the number of parts is reduced in the first embodiment in which the number of trigger signal transmitters 8 is smaller than in the modified example. This is preferable because the manufacturing cost can be reduced. The number, installation location, and the like of the trigger signal transmitters 8 can be appropriately set according to the balance between required accuracy and cost.

  DESCRIPTION OF SYMBOLS 1 Car body, 2 Wheel, 6 Wheel state detection unit, 8 Trigger signal transmitter, 10 Trigger signal transmitter drive unit, 12 Receiver, 14 TPMS-ECU, 16 Display part, 100 Vehicle, 142 Storage part, 142a Address A, 142b Address B, 200 Tire pressure monitoring system.

Claims (1)

A transmitter that is provided on each of the plurality of wheels and wirelessly transmits a signal including wheel position information, a receiver that is provided on the vehicle body side and that receives the signal, and causes the transmitter to transmit the signal. Trigger signal transmitter for transmitting a trigger signal, wheel position information received by controlling which trigger signal transmitter causes the transmitter to transmit the signal, and which wheel the signal received by the receiver belongs to A wheel position detection system abnormality determination method comprising: a control unit that performs wheel position detection based on
Storing identification information possessed by each of the plurality of transmitters in a predetermined wheel order, and creating an inspection standard that associates the wheel position with the identification information;
A trigger signal is transmitted from the trigger signal transmitter, a signal including identification information and wheel position information is transmitted from the transmitter, and wheel position detection is performed to detect a wheel position based on the transmitted wheel position information. Storing the identification information transmitted based on the detected wheel position in the order of the wheels, and creating a detection result of wheel position detection;
Comparing the inspection standard and the detection result to determine whether the wheel position detection has been normally performed;
An abnormality determination method for a wheel position detection system, comprising:

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