WO2018078927A1

WO2018078927A1 - Wireless communication device

Info

Publication number: WO2018078927A1
Application number: PCT/JP2017/020026
Authority: WO
Inventors: 柚木▲崎▼　穏宗
Original assignee: 株式会社デンソー
Priority date: 2016-10-26
Filing date: 2017-05-30
Publication date: 2018-05-03
Also published as: TW201817175A; JP2018074293A

Abstract

This wireless communication device is provided with: a first wireless unit including a first antenna and a transmission circuit; a second wireless unit including a second antenna and a reception circuit; a transmission control unit (S10) which allows a radio wave to be transmitted from the first wireless unit with prescribed power; a reception power calculation unit (S20) which calculates the reception power of a radio wave that is received by the second wireless unit, when the transmission control unit allows a radio wave to be transmitted to the first wireless unit; and an abnormality determination unit (S30) which determines that at least one among the first wireless unit and the second wireless unit is abnormal, when the reception power calculated by the reception power calculation unit is smaller than a prescribed threshold value.

Description

Wireless communication device

Cross-reference of related applications

This application is based on Japanese Patent Application No. 2016-209909 filed on October 26, 2016, the contents of which are incorporated herein by reference.

The present disclosure relates to a wireless communication apparatus, and more particularly, to a technique for inspecting whether or not an abnormality has occurred in a wireless unit including an antenna.

The RF characteristics of the wireless communication device must be inspected at the time of manufacture or failure. In the wireless communication device disclosed in Patent Document 1, an antenna and an RF circuit are connected via a spring pin connector. The RF circuit is fixed to the substrate, and the antenna is fixed to an inner lid that is a lid of the substrate. In a state where the inner lid and the substrate are fitted together, the antenna is in a state of pushing the spring connector through the inner lid, and the antenna and the RF circuit are electrically connected.

In Patent Document 1, an inspection probe is used when inspecting RF characteristics. The inspection probe is inserted between the spring pin connector and the inner lid, and the spring pin connector side is made of a conductive material, and the inner lid side is made of an insulating material. Therefore, when the inspection probe is inserted between the spring pin connector and the inner lid, the inspection probe and the spring pin connector are electrically connected, but the spring pin connector and the antenna are not connected. It becomes.

JP 2014-45262 A

In the technique disclosed in Patent Document 1, the spring pin connector and the antenna are not connected at the time of inspection. Therefore, it cannot be inspected whether or not an abnormality has occurred in the wireless unit including the antenna.

Since the tip of the spring connector is only pressed against the conductive material by the biasing force of the spring, connection failure tends to occur at the tip of the spring connector in the case of the configuration having the spring connector. Therefore, when the antenna and the RF circuit are connected by the spring connector, it is necessary to inspect whether or not an abnormality has occurred particularly in the radio unit including the antenna. However, as described above, the technique of Patent Document 1 cannot check whether an abnormality has occurred in the wireless unit including the antenna.

The technique of Patent Document 1 uses an inspection probe for inspection, and requires an operation for bringing the inspection probe into contact with the tip of the spring pin connector, so that the operation for performing the inspection is troublesome.

The present disclosure has been made in view of the above points, and an object of the present disclosure is to provide a wireless communication device that can easily check whether an abnormality has occurred in a wireless unit including an antenna.

A wireless communication apparatus according to an aspect of the present disclosure is predetermined from a first wireless unit including a first antenna and a transmission circuit, a second wireless unit including a second antenna and a reception circuit, and a first wireless unit. A transmission control unit that transmits radio waves with the received power, a reception power calculation unit that calculates reception power of radio waves received by the second radio unit when the transmission control unit causes the first radio unit to transmit radio waves, And an abnormality determining unit that determines that at least one of the first wireless unit and the second wireless unit is abnormal when the received power calculated by the received power calculating unit is smaller than a predetermined threshold.

According to the wireless communication device, the antenna and the circuit are not separated when determining whether or not an abnormality has occurred in the first wireless unit and the second wireless unit. Therefore, it is possible to inspect whether or not an abnormality has occurred in the wireless unit including the antenna.

In Patent Document 1, a dedicated inspection probe is required for the inspection of the RF characteristics. However, in the present disclosure, the first wireless unit and the second wireless unit included in the wireless communication device are used to connect the wireless units. Determine whether an abnormality has occurred. Therefore, it is possible to easily check whether an abnormality has occurred in the wireless unit.

The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings. The drawing
FIG. 1 is a block diagram illustrating the overall configuration of the wireless communication apparatus according to the first embodiment. FIG. 2 is a diagram illustrating a mechanical configuration of the wireless communication device, FIG. 3 is an enlarged view of the vicinity of the spring pin connector. FIG. 4 is a flowchart showing the inspection process executed by the control unit of FIG. FIG. 5 is a block diagram illustrating the overall configuration of the wireless communication apparatus according to the second embodiment. FIG. 6 is a flowchart showing the inspection process executed by the control unit of FIG. FIG. 7 is a block diagram illustrating the overall configuration of the wireless communication apparatus according to the third embodiment. FIG. 8 is a flowchart showing the inspection process executed by the control unit of FIG. FIG. 9 is a block diagram illustrating the overall configuration of the wireless communication apparatus according to the fourth embodiment. FIG. 10 is a flowchart showing the inspection process executed by the control unit of FIG.

(First embodiment)
(overall structure)
Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. FIG. 1 is a block diagram illustrating an overall configuration of a wireless communication device 1 according to the first embodiment of the present disclosure. The wireless communication device 1 is mounted on a vehicle and performs vehicle-to-vehicle communication and road-to-vehicle communication. As illustrated in FIG. 1, the wireless communication device 1 includes a first wireless unit 10, a second wireless unit 20, a control unit 30, and a notification unit 40. These are accommodated in a housing 2 made of resin.

The first radio unit 10 includes a first radio circuit unit 11, a first antenna 14, and a spring pin connector 15. The first radio circuit unit 11 includes a transmission circuit 12 and a reception circuit 13. The transmission circuit 12 modulates the baseband signal supplied from the control unit 30 into a high frequency signal and outputs it to the first antenna 14. The first antenna 14 transmits a high frequency signal as a radio wave. The receiving circuit 13 demodulates the radio wave received by the first antenna 14 to extract a baseband signal and outputs the baseband signal to the control unit 30.

The electrical length of the first antenna 14 is an electrical length determined based on the frequency band of the radio wave transmitted and received by the first radio unit 10. In the present embodiment, the frequency band of radio waves transmitted and received by the first wireless unit 10 is the 5.8 GHz band. The spring pin connector 15 is provided between the first antenna 14 and the first radio circuit unit 11.

The second radio unit 20 includes a second radio circuit unit 21, a second antenna 24, and a spring pin connector 25. These are the same configurations as the first radio circuit unit 11, the first antenna 14, and the spring pin connector 15 of the first radio unit 10, respectively. Therefore, the second radio circuit unit 21 includes a transmission circuit 22 and a reception circuit 23, and the frequency band of radio waves transmitted and received by the second radio unit 20 is also a 5.8 GHz band. Although the width of the frequency band can be variously set, it is usually a width that can secure a plurality of channels in the frequency band. However, the frequency band may be as wide as one channel.

The configuration including two

radio units

10 and 20 that use the same transmission / reception frequency band is useful when it is necessary to enable reception on a plurality of channels in the same time zone, such as a control channel and a service channel. . Also, it can be used for communication by MIMO (Multiple Input Multiple Output) method.

The control unit 30 is configured by a computer including a CPU, RAM, ROM, I / O, and a bus line connecting these configurations. The ROM stores a program for causing a general-purpose computer to function as the control unit 30. The above-described program may be stored in a non-transitory tangible storage medium, and a specific storage medium is not limited to a ROM. For example, the program may be stored in a flash memory. Executing this program by the CPU corresponds to executing a method corresponding to the program.

The control unit 30 controls the first radio unit 10 and the second radio unit 20 to cause the first radio unit 10 and the second radio unit 20 to transmit and receive radio waves. Moreover, the process which test | inspects whether abnormality has arisen in at least one of the 1st radio | wireless part 10 and the 2nd radio | wireless part 20 is performed. Hereinafter, this processing is referred to as inspection processing. Specific processing contents of the inspection processing will be described later. Note that some or all of the functions executed by the control unit 30 may be configured in hardware by one or a plurality of ICs.

When the notification unit 40 determines that an abnormality has occurred in either the first radio unit 10 or the second radio unit 20 as a result of the execution of the inspection process by the control unit 30, the notification unit 40 displays either this or a sound. Either or both are notified to the user.

FIG. 2 shows a mechanical configuration of the wireless communication device 1. As shown in FIG. 2, the housing 2 of the present embodiment has a rectangular parallelepiped shape, and the first antenna 14 and the second antenna 24 are attached to the inner surface of one wall plate portion 2 a of the housing 2 in parallel with each other. ing. The housing 2 is divided into two or more configurations before assembly, and after the first antenna 14 and the second antenna 24 are attached to the wall plate portion 2a, the wall plate portion 2a has Can be combined with other members.

One end of the first antenna 14 is in contact with the tip of the spring pin connector 15. The base end of the spring pin connector 15 is fixed to the substrate 3. On the board 3, the transmission circuit 12, the reception circuit 13, the transmission circuit 22, the reception circuit 23, the control unit 30, and the like of the first wireless unit 10 shown in FIG. An end of the spring pin connector 15 on the side fixed to the substrate 3 is connected to the first wireless circuit unit 11 by a conductor pattern 4 formed on the substrate 3.

One end of the second antenna 24 is in contact with the tip of the spring pin connector 25, and the base end of the spring pin connector 25 is fixed to the substrate 3. The base end of the spring pin connector 25 is connected to the second radio circuit unit 21 by the conductor pattern 4.

FIG. 3 is an enlarged view of the vicinity of the spring pin connector 25 and is a view of the vicinity of the spring pin connector 25 from the spring pin connector 15 side. In FIG. 3, the tip of the spring pin connector 25 is not in contact with the second antenna 24. Such a thing may occur due to various causes such as deformation of the housing 2, deformation of the substrate 3, and poor assembly of the housing 2. If the tip of the spring pin connector 25 is not in contact with the second antenna 24, the second radio unit 20 cannot exhibit the required performance.

In addition, there is a possibility that the spring pin connector 15 and the first antenna 14 are not in contact with each other. If the spring pin connector 15 and the first antenna 14 are not in contact with each other, the first radio unit 10 exhibits the required performance. I can't.

Therefore, after the wireless communication device 1 is assembled, whether the first wireless unit 10 and the second wireless unit 20 are in a normal state where the required performance can be exhibited, in other words, the first wireless unit 10 and the second wireless unit 20 are both in the normal state. It is preferable to check whether an abnormality has occurred.

However, the

spring pin connectors

15 and 25, the first antenna 14, and the second antenna 24 are disposed inside the housing 2. Therefore, it is not possible to confirm whether the spring pin connector 15 and the first antenna 14 and the spring pin connector 25 and the second antenna 24 are in contact from the outside of the housing 2.

Here, the wireless communication device 1 of the present embodiment includes two wireless units, a first wireless unit 10 and a second wireless unit 20. Therefore, the control unit 30 uses the two

radio units

10 and 20 to execute an inspection process for inspecting whether or not an abnormality has occurred in at least one of the first radio unit 10 and the second radio unit 20.

FIG. 4 is a flowchart showing an inspection process executed by the control unit 30 of the first embodiment. The process shown in FIG. 4 is executed when a predetermined inspection start condition such as a certain period is satisfied when the power is turned on.

In S10, the radio waves for inspection are transmitted from the first radio unit 10 with predetermined power. The inspection radio wave may be an unmodulated wave or a radio wave obtained by modulating a predetermined baseband signal and superimposed on a carrier wave. The process of S10 is a process as a transmission control unit. In addition, when radio waves are transmitted from the first radio unit 10, the second radio unit 20 receives radio waves transmitted by the first radio unit 10.

S20 corresponds to the received power calculation unit, and when the radio wave is transmitted from the first radio unit 10, the received power X (dBm) of the radio wave received by the second radio unit 20 is generated in the receiving circuit 23. Calculated from the voltage value and current value.

S30 and S40 correspond to an abnormality determination unit. In S30, it is determined whether or not the received power X calculated in S20 is larger than a preset received power threshold Xth. If there is an abnormality in the first radio unit 10 such as the first antenna 14 and the spring pin connector 15 are not in contact with each other, the power transmitted by the first radio unit 10 is reduced, so the second radio unit 20 receives the signal. The received power X is lower than when the first radio unit 10 is normal. In addition, when there is an abnormality in the second radio unit 20 such as when the second antenna 24 and the spring pin connector 25 are not in contact, even if the first radio unit 10 transmits the inspection radio wave with a predetermined power, The received power X calculated in S20 decreases.

That is, when at least one of the first radio unit 10 and the second radio unit 20 is abnormal, the received power X is lower than when both the first radio unit 10 and the second radio unit 20 are normal. The reception power threshold value Xth is a reception power X when the first radio unit 10 and the second radio unit 20 are both normal and a reception when at least one of the first radio unit 10 and the second radio unit 20 is abnormal. The power X is set to a value that can be distinguished.

If the determination in S30 is NO, there is a possibility that an abnormality has occurred in at least one of the first radio unit 10 and the second radio unit 20, so in S40, the notification unit 40 is used to notify the driver of that. Notice. On the other hand, if the determination in S30 is YES, the processing of FIG.

(Summary of embodiment)
As described above, in the first embodiment described above, since the first radio unit 10 and the second radio unit 20 include the

spring pin connectors

15 and 25, the

antennas

14 and 24 are arranged on the inner surface of the housing 2. Even easier to assemble. However, it is difficult to determine from the outside of the housing 2 whether or not the spring pin connector 15 and the first antenna 14 and the spring pin connector 25 and the second antenna 24 are connected.

Therefore, in the present embodiment, the first wireless unit 10 and the second wireless unit 20 that are originally provided in the wireless communication device 1 are used to determine whether an abnormality has occurred in the

wireless units

10 and 20. Therefore, it is possible to easily check whether an abnormality has occurred in the

radio units

10 and 20.

Further, in the present embodiment, when determining whether or not an abnormality has occurred in the first radio unit 10 and the second radio unit 20, between the first antenna 14 and the transmission circuit 12 and the second antenna 24. And the receiving circuit 23 are not disconnected. Therefore, it is possible to inspect whether or not an abnormality has occurred in the first radio unit 10 including the first antenna 14 and the second radio unit 20 including the second antenna 24.

Further, the first radio unit 10 and the second radio unit 20 transmit and receive radio waves in the same frequency band. Accordingly, the reception power X at normal time increases. Therefore, the reception power threshold value Xth can also be set to a large value. From these things, the accuracy of the judgment whether the 1st radio | wireless part 10 and the 2nd radio | wireless part 20 have abnormality improves compared with the case where the reception power X at the time of normal is close to a noise level.

(Second Embodiment)
Next, a second embodiment will be described. In the following description of the second embodiment, elements having the same reference numerals as those used so far are the same as elements having the same reference numerals in the previous embodiments unless otherwise specified. Further, when only a part of the configuration is described, the above-described embodiment can be applied to the other parts of the configuration.

FIG. 5 shows a configuration diagram of the wireless communication apparatus 200 of the second embodiment. The wireless communication device 200 includes a second wireless unit 220 instead of the second wireless unit 20 of the first embodiment. Further, the function of the control unit 230 is different from the function of the control unit 30 of the first embodiment.

The second radio unit 220 has a configuration in which an attenuator 226 and a changeover switch 227 are added to the configuration of the second radio unit 20 of the first embodiment. The attenuator 226 is disposed in the signal path between the second antenna 24 and the second radio circuit unit 21 and is provided to weaken the intensity of the radio wave received by the second antenna 24. The attenuation by the attenuator 226 is such that the reception circuit 23 is not saturated when the second radio unit 220 receives the inspection radio wave in a state where both the first radio unit 10 and the second radio unit 220 are normal. In addition, the signal level of the inspection radio wave is set so as not to decrease to the noise level.

The changeover switch 227 connects the second antenna 24 and the second radio circuit unit 21 without passing through the path connecting the second antenna 24 and the second radio circuit unit 21 via the attenuator 226. Switch the route to be performed. The changeover switch 227 is controlled by the control unit 230 to perform path switching.

The control unit 230 executes the inspection process shown in FIG. 6 instead of the process shown in FIG. The process shown in FIG. 6 is executed when the same inspection start condition as in FIG. 4 is satisfied. In the process shown in FIG. 6, first, in S5, the path through which the signal received by the antenna 24 passes is set to the side passing through the attenuator 226. That is, the changeover switch 227 is in a state where the second antenna 24 and the attenuator 226 are connected. Then, it progresses to S10.

S10 to S40 are the same as in the first embodiment. In S10, the inspection radio wave is transmitted from the first radio unit 10 with a predetermined power, and the second radio unit 20 receives the inspection radio wave. Since S5 is executed before S10, the first wireless unit 10 can switch the changeover switch 227 to the side connecting the second antenna 24 and the receiving circuit 23 via the attenuator 226. Inspection radio waves are transmitted.

If the determination result in S30 is YES or S40 is executed, the process proceeds to S50. In S <b> 50, the changeover switch 227 is switched so that the signal received by the antenna 24 becomes a path that does not pass through the attenuator 226 in order to perform normal communication that is not a test.

In the second embodiment, when inspecting whether or not at least one of the first radio unit 10 and the second radio unit 220 is abnormal, a signal representing the radio wave received by the second antenna 24 is sent to the attenuator 226. To the receiving circuit 23.

If the isolation between the first radio unit 10 and the second radio unit 20 is low, the reception level of the test radio wave received by the second antenna 24 is too high, and the signal representing the test radio wave is received without being attenuated. If the signal is input to the circuit 23, the receiving circuit 23 may be destroyed.

Therefore, the wireless communication apparatus 200 of the present embodiment includes the attenuator 226, and inputs a signal representing the inspection radio wave to the receiving circuit 23 via the attenuator 226 at the time of inspection. Thereby, it is suppressed that the receiving circuit 23 is destroyed.

(Third embodiment)
The wireless communication apparatus 300 according to the third embodiment includes an inspection start button 350 as illustrated in FIG. The inspection start button 350 is exposed to a part of the housing 2 and can be operated by a user such as a driver. When the inspection start button 350 is pressed, a signal indicating that is input to the control unit 330.

The control unit 330 executes the same processing as the control unit 230 of the second embodiment except that processing is performed due to the provision of the inspection start button 350. Other configurations of the wireless communication apparatus 300 are the same as those of the wireless communication apparatus 200 of the second embodiment.

FIG. 8 shows the inspection process executed by the control unit 330. In the process shown in FIG. 8, S1 is added to the process shown in FIG. The processing shown in FIG. 8 is periodically executed while the control unit 330 is activated.

In S1, it is determined whether or not the inspection start button 350 has been pressed. If this determination is NO, the determination of S1 is repeated. On the other hand, if the determination in S1 is YES, the process proceeds to S5. S5 and subsequent steps are the same as those in FIG.

The wireless communication apparatus 300 according to the third embodiment includes an inspection start button 350. When the inspection start button 350 is pressed, it is determined whether the first wireless unit 10 and the second wireless unit 220 are abnormal. Start the process to inspect. Thereby, when a user such as a driver feels an abnormality in the operation of the wireless communication apparatus 300, the inspection can be started quickly. Therefore, it is possible to quickly inspect whether at least one of the first radio unit 10 and the second radio unit 220 is abnormal.

(Fourth embodiment)
As illustrated in FIG. 9, the wireless communication device 400 according to the fourth embodiment includes an acceleration sensor 460. As the acceleration sensor 460, any one of 1-axis to 3-axis acceleration sensors can be used. The acceleration sensor 460 sequentially detects the acceleration a applied to the wireless communication device 400 and supplies a signal representing the detected acceleration a to the control unit 430.

The control unit 430 performs the same process as the control unit 230 of the second embodiment except that the process by the provision of the acceleration sensor 460 is performed. Other configurations of the wireless communication apparatus 400 are the same as those of the wireless communication apparatus 200 of the second embodiment.

FIG. 10 shows processing executed by the control unit 430. In the process shown in FIG. 10, S2 is added to the process shown in FIG. The processing shown in FIG. 10 is periodically executed while the control unit 430 is activated.

In S2, it is determined whether or not the acceleration a detected by the acceleration sensor 460 is larger than a preset inspection start threshold value ath. The magnitude of the inspection start threshold value ath can be set as appropriate. In the present embodiment, the magnitude of the inspection start threshold value ath is such that the acceleration a does not exceed the inspection start threshold value ath in the degree of vibration that occurs during normal driving of the vehicle, and the acceleration a starts when the wireless communication device 400 falls. The size is set so as to exceed the threshold value ath.

If the determination of S2 is NO, the determination of S2 is repeated. On the other hand, if the determination in S2 is YES, the process proceeds to S5. S5 and subsequent steps are the same as those in FIG.

When a large vibration is applied to the wireless communication device 400, the contact between the first antenna 14 and the spring pin connector 15 and the contact between the second antenna 24 and the spring pin connector 25 are likely to be non-contact. The wireless communication apparatus 400 according to the fourth embodiment includes an acceleration sensor 460. When it is determined that the acceleration a detected by the acceleration sensor 460 exceeds the inspection start threshold ath, the first wireless unit 10 and the second wireless unit The process of inspecting whether 220 is abnormal is started.

Therefore, in the fourth embodiment, the inspection process is automatically performed in a situation where the contact between the first antenna 14 and the spring pin connector 15 and the contact between the second antenna 24 and the spring pin connector 25 are likely to be non-contact. be able to.

(Modification 1)
In the above-described embodiment, the

spring pin connectors

15 and 25 are disposed between the

antennas

14 and 24 and the

radio circuit units

11 and 21 in both the first radio unit 10 and the second radio units 20 and 120.

However, one of the first radio unit 10 and the second radio unit 20, 120 may connect the

antennas

14, 24 and the

radio circuit units

11, 21 without the

spring pin connectors

15, 25. Furthermore, the

antennas

14 and 24 and the

radio circuit units

11 and 21 may be connected without the

spring pin connectors

15 and 25 in both the first radio unit 10 and the second radio units 20 and 120.

(Modification 2)
In the above-described embodiment, the first radio unit 10 and the second radio units 20 and 120 use the same transmission / reception frequency band. However, the present invention is not limited to this, and the transmission / reception frequency bands used by the first radio unit 10 and the second radio units 20 and 120 may partially overlap each other.

Further, the transmission / reception frequency bands used by the first radio unit 10 and the second radio units 20 and 120 may be different frequency bands that do not overlap each other. A configuration including two wireless units that use different frequency bands that do not overlap each other in the same casing has been widely put into practical use. Therefore, when the transmission / reception frequency bands used by the first radio unit 10 and the second radio units 20 and 120 are different frequency bands that do not overlap each other, the versatility of the present disclosure is enhanced.

Examples of transmission / reception frequency bands of the first radio unit 10 and the second radio units 20 and 120 include frequency bands used for vehicle-to-vehicle and road-to-vehicle communication other than 5.8 GHz, such as 700 MHz band and 5.9 GHz band. In addition, at least one of the first wireless unit 10 and the second wireless unit 20, 120 is a wireless unit for uses other than inter-vehicle and road-to-vehicle communication, such as a mobile phone, a wireless LAN, Bluetooth (registered trademark), and NFC. A radio unit may be used.

In addition, when the first radio unit 10 and the second radio units 20 and 120 use the same transmission / reception frequency band, the attenuator 226 is often required. On the other hand, when the transmission / reception frequency bands used by the first radio unit 10 and the second radio units 20 and 120 are different frequency bands that do not overlap each other, radio waves having different frequency bands are close to the radio wave transmission source. In many cases, the received power X does not increase. Therefore, there are many cases where the attenuator 226 can be omitted.

(Modification 3)
In the above-described embodiment, the reception power threshold value Xth is one type. However, when both the first radio unit 10 and the second radio units 20 and 120 are abnormal, and when only one of the first radio unit 10 and the second radio units 20 and 120 is abnormal, reception is performed. The magnitude of the power X is different. Therefore, two types of first received power threshold value Xth1 and second received power threshold value Xth2 (Xth1 <Xth2) having different sizes may be prepared. If Xth1 <X <Xth2, it is determined that one of the first radio unit 10 and the second radio unit 20, 120 is abnormal. If X <Xth1, the first radio unit 10 and the second radio unit 10 are determined. It may be determined that both radio units 20 and 120 are abnormal.

(Modification 4)
In the above-described embodiment, notification is performed only when it is determined that there is a possibility that an abnormality has occurred in at least one of the first wireless unit 10 and the second wireless unit 20, 120. However, the determination result may also be notified when it is determined that both the first radio unit 10 and the second radio units 20 and 120 are normal.

(Modification 5)
The third embodiment and the fourth embodiment may be combined. That is, when the acceleration sensor 460 is added to the wireless communication apparatus 300 and the inspection start button 350 is pressed, or when the acceleration a detected by the acceleration sensor 460 exceeds the inspection start threshold value ath, S5 and subsequent steps are executed. May be.

(Modification 6)
The

wireless communication devices

1, 200, 300, and 400 may be used other than the vehicle.

Although the present disclosure has been described with reference to the embodiments, it is understood that the present disclosure is not limited to the embodiments and structures. The present disclosure includes various modifications and modifications within the equivalent range. In addition, various combinations and forms, as well as other combinations and forms including only one element, more or less, are within the scope and spirit of the present disclosure.

Claims

A first radio section (10) comprising a first antenna (14) and a transmission circuit (12);
A second radio unit (20, 220) including a second antenna (24) and a receiving circuit (23);
A transmission control unit (S10) for transmitting radio waves with predetermined power from the first wireless unit;
A reception power calculation unit (S20) that calculates reception power of radio waves received by the second radio unit when the transmission control unit causes the first radio unit to transmit radio waves;
An abnormality determining unit (S30) that determines that at least one of the first wireless unit and the second wireless unit is abnormal when the received power calculated by the received power calculating unit is smaller than a predetermined threshold; A wireless communication device comprising:
In claim 1,
At least one of the first antenna and the transmission circuit and at least one of the second antenna and the reception circuit are connected to each other via a spring pin connector (15, 25).
In claim 1 or 2,
A radio communication apparatus in which a frequency band of a radio wave transmitted by the first radio unit and a frequency band of a radio wave received by the second radio unit overlap each other.
In claim 1 or 2,
A radio communication apparatus in which a frequency band of a radio wave transmitted by the first radio unit and an frequency band of a radio wave received by the second radio unit do not overlap.
In claim 3,
The second radio unit is
An attenuator (226) disposed in a signal path between the second antenna and the receiving circuit;
A changeover switch (227) for switching between a path connecting the second antenna and the receiving circuit via the attenuator and a path connecting the second antenna and the receiving circuit without going through the attenuator; Further comprising
The transmission control unit is a radio that transmits inspection radio waves from the first radio unit in a state in which the changeover switch is switched to the side connecting the second antenna and the reception circuit via the attenuator. Communication device.
In any one of claims 1 to 5,
An inspection start button (350) operated by a user when the wireless communication device starts an inspection;
The transmission control unit is a wireless communication device that transmits radio waves with the predetermined power from the first wireless unit based on an operation of the inspection start button.
In any one of claims 1 to 6,
An acceleration sensor (460) for detecting acceleration generated in the wireless communication device;
The transmission control unit is a wireless communication device that transmits radio waves with the predetermined power from the first wireless unit based on the fact that the acceleration detected by the acceleration sensor exceeds an inspection start threshold.