JP7082602B2 - Transmission line abnormality detection system and transmission line abnormality detection device - Google Patents

Description

The present invention relates to a transmission line abnormality detection system for detecting an abnormality such as disconnection of a signal transmission line composed of a wire harness or the like provided on a moving body such as an automobile, and a transmission line abnormality detection device.

Inside the vehicle, a transmission line for communicating various signals configured such as a wire harness is provided. Such signals include, for example, a camera signal that provides a driver with an image of the vehicle environment that is a blind spot, a millimeter-wave radar signal that provides environmental information to an advanced driver support system, and the like. Such a signal is related to the safety of vehicle driving, and it is important not only that the signal is normally transmitted but also that the prompt detection of the transmission abnormality is important.

Conventionally, as a technique for detecting an abnormality in a wire constituting a wire harness, a pair of wires constituting the wire harness is used for the purpose of detecting a wiring defect caused by wear of the wire and identifying the position of the defect. There is known a detection method for providing a sensor of the above (Patent Document 1). In this detection method, in order to detect partial discharge generated between wires due to wear or the like, a pulse is detected from the data acquired from the pair of sensors, and defect determination and defect position identification are performed from the signal characteristics of the pulse. I do.

However, in the above-mentioned conventional technique, at least two sensors forming a pair to be provided on the wire are required, and the cost increases as the number of wires and the like increases. Further, since the above-mentioned conventional technique cannot detect a defect that does not involve partial discharge between wires, it may not be possible to detect a defect depending on the failure mode.

Japanese Unexamined Patent Publication No. 2008-256674

An object of the present invention is to detect an abnormality such as a disconnection of a signal transmission line composed of a wire harness or the like provided in a moving body of an automobile or the like without using a dedicated sensor or an additional sensor or the like.

One aspect of the present invention is a transmission line abnormality detection system for detecting an abnormality in a signal transmission line provided in a moving body, and is connected to a radio receiving device that receives a radio signal transmitted from the outside of the moving body. A predetermined signal-to-noise ratio in the radio wave of the antenna mounted on the moving body, the radio wave receiving unit that receives the radio wave via the antenna, and the radio signal included in the received radio wave. It has an SN calculation unit that repeatedly calculates at time intervals, and an abnormality determination unit that determines the presence or absence of an abnormality in the signal transmission line based on the calculated signal-to-noise ratio.
According to another aspect of the present invention, the abnormality determination unit reduces the signal-to-noise ratio calculated repeatedly when the calculated signal-to-noise ratio is smaller than a predetermined value, or the repeatedly calculated signal-to-noise ratio in the most recent predetermined length period. When the amount exceeds a predetermined value, it is determined that an abnormality has occurred in the signal transmission line.
According to another aspect of the present invention, the radio receiver is a radio broadcast receiver, a television broadcast receiver, a GPS receiver, an ETC radio wave receiver, or a telematics control unit mounted on the mobile body.
Another aspect of the present invention is a transmission line abnormality detecting device provided in a mobile body for detecting an abnormality in a signal transmission line, and is connected to a radio wave receiving device that receives a radio signal transmitted from the outside of the moving body. The signal-to-noise ratio of the radio wave contained in the received radio wave and the radio wave receiving unit that receives the radio wave via the antenna mounted on the moving body is repeatedly calculated at predetermined time intervals. The SN calculation unit is provided, and an abnormality determination unit that determines the presence or absence of an abnormality in the signal transmission line based on the calculated signal-to-noise ratio.

According to the present invention, it is possible to detect an abnormality such as a disconnection in a signal transmission line composed of a wire harness or the like provided in a moving body of an automobile or the like without using a dedicated sensor or the like.

It is a figure which shows an example of the structure of the transmission line abnormality detection system which concerns on one Embodiment of this invention. It is a flow chart which shows the procedure of the processing of the transmission line abnormality detection system shown in FIG. It is a figure which shows an example of the arrangement of the antenna used by the transmission line abnormality detection system shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a transmission line abnormality detection system for detecting an abnormality in a signal transmission line in a vehicle according to an embodiment of the present invention. The transmission line abnormality detection system 100 is mounted on a moving vehicle 102. In this embodiment, the vehicle 102 is, for example, an automobile driven by a motor or an internal combustion engine. The vehicle 102 includes a transmission line abnormality detection device 106 that constitutes a part of the transmission line abnormality detection system 100, an AV (audio-visual) device 108, a GPS (Global Positioning System) receiving device 110, and the GPS (Global Positioning System) receiving device 110. It includes an ETC (Electronic Tool Transmission) device 112 and a TCU (telematics control unit) 114. The vehicle 102 also includes a navigation device 116, a driver assistance (ADAS, Advanced Driver Assistance System) device 118, a camera image acquisition device 120, and a radar information acquisition device 122.

The transmission line abnormality detection device 106, AV device 108, GPS receiver 110, ETC device 112, TCU 114, navigation device 116, driver support device 118, camera image acquisition device 120, and radar information acquisition device 122 are in-vehicle network buses. They are communicably connected to each other via 124. Here, the vehicle-mounted network bus 124 is, for example, a CAN communication bus for performing communication conforming to a CAN (Protocol Area Network) communication standard.

The AV device 108 is, for example, a so-called display audio device, and includes a radio broadcast receiving device and a television broadcasting receiving device. Radio broadcast receivers may include AM radio broadcast receivers and FM radio broadcast receivers. The AV device 108 uses the antennas 132a, 132b, and 132c to receive radio signals of AM radio broadcasting, FM radio broadcasting, and television broadcasting such as so-called One Seg, respectively, to receive the audio of these radio broadcasting and the television broadcasting. Audio and images are output to an in-vehicle speaker (not shown) and a display device (display device).

The AV device 108 also displays the map information of the navigation device 116, the route information, and the current position information of the vehicle 102 on the display device according to an instruction from the navigation device 116 described later. The AV device 108 further displays an image output by the camera image acquisition device 120, which will be described later, on the display device.

The GPS receiving device 110 receives GPS satellite radio waves using the antenna 132d and generates current position information of the vehicle 102. The GPS receiving device 110 outputs the generated current position information to, for example, the driver support device 118 and / or the navigation device 116.

The ETC device 112 includes an ETC radio wave receiving device, and uses an antenna 132e to communicate with a roadside device (not shown) of the ETC system provided at a toll gate such as a highway to execute a toll payment process. The TCU 114 uses the antenna 132f to communicate with a communication device outside the vehicle 102 via a communication network such as the Internet.

Here, the antennas 132a, 132b, 132c, 132d, 132e, 132f are antennas mounted on the vehicle 102, and the AV device 108, the GPS receiving device 110, the ETC device 112, and the TCU 114 transmit from the outside of the vehicle 102. It is a wireless receiving device that receives a wireless signal to be received. Hereinafter, the antennas 132a, 132b, 132c, 132d, 132e, and 132f are collectively referred to as an antenna 132.

The navigation device 116 searches for a route from the current position of the vehicle 102 to the destination based on the current position of the vehicle 102 received from the GPS receiving device 110 and the map information according to the prior art. The navigation device 116 guides the driver to travel along the searched route by displaying the searched route and the current position of the vehicle 102 on the display device, for example, via the AV device 108. do.

The driver support device 118 is various related to the running of the vehicle 102 based on the image of the external environment of the vehicle 102 from the camera image acquisition device 120 described later and the object detection information in the external environment from the radar information acquisition device 122. To support the driver. This driver support includes, for example, driving control such as ACC (adaptive cruise control) and ALK (adaptive lane keep), and notification of safety-related information such as forward collision warning, pedestrian detection, and traffic sign recognition. obtain.

The camera image acquisition device 120 acquires an image or video of the external environment of the vehicle 102 from the front camera 150, the rear camera 152, the right side camera 154, and the left side camera 156 provided in the vehicle 102. Specifically, the camera image acquisition device 120 includes a receiving device 160, a transmitting device 162, and a NW communication device (network communication device) 164. The NW communication device 164 is a transmitter / receiver for communicating with other devices such as the AV device 108 via the vehicle-mounted network bus 124, and is composed of, for example, a CAN transceiver.

The receiving device 160 receives image signals (or video signals) from the front camera 150, the rear camera 152, the right side camera 154, and the left side camera 156, respectively, via the signal transmission lines 126a, 126b, 126c, and 126d, respectively. do. The transmission device 162 transmits signals such as commands and setting data to the front camera 150, the rear camera 152, the right side camera 154, and the left side camera 156, respectively, via the signal transmission lines 126a, 126b, 126c, and 126d, respectively. .. That is, the receiving device 160 and the transmitting device 162 are a receiving device and a transmitting device that transmit and receive signals via the signal transmission lines 126a, 126b, 126c, and 126d, respectively. Here, the signal transmission lines 126a, 126b, 126c, 126d are configured as one wire harness, for example, by bundling all or part of them.

The front camera 150 and the rear camera 152 are arranged, for example, on the front bumper and the rear bumper (both not shown) of the vehicle 102 to image the external environment in front of and behind the vehicle 102, respectively. Further, the right side camera 154 and the left side camera 156, for example, are arranged on the right side mirror and the left side mirror (both not shown) of the vehicle 102 to image the external environment on the right side and the left side of the vehicle 102, respectively.

The camera image acquisition device 120 presents all or a part of the image acquired from the front camera 150 or the like to the driver by a display device, for example, via the AV device 108. Further, the camera image acquisition device 120 transmits the acquired image to the driver support device 118.

The radar information acquisition device 122 generates sensing information about an object existing in the external environment based on sensor signals from, for example, a front radar sensor 170 and a rear radar sensor 172, which are millimeter-wave radars provided in the vehicle 102. Specifically, the radar information acquisition device 122 includes a receiving device 174, a transmitting device 176, and a NW communication device (network communication device) 178. The NW communication device 178 is a transmitter / receiver for communicating with other devices such as the driver support device 118 via the vehicle-mounted network bus 124, and is composed of, for example, a CAN transceiver.

The receiving device 174 receives the sensor signals from, for example, the front radar sensor 170 and the rear radar sensor 172, which are millimeter-wave radars, provided in the vehicle 102, respectively, via the signal transmission lines 126e and 126f, respectively. The transmission device 176 transmits signals such as commands and setting data to the front radar sensor 170 and the rear radar sensor 172 via the signal transmission lines 126e and 126f, respectively. That is, the receiving device 174 and the transmitting device 176 are a receiving device and a transmitting device that transmit and receive signals via the signal transmission lines 126e and 126f, respectively. Here, the signal transmission lines 126e and 126f are configured as one wire harness, for example, by bundling all or part of them. Further, a part of the wire harness composed of the signal transmission line 126a or the like and the wire harness composed of the signal transmission line 126e or the like may be bundled as one wire harness.

The front radar sensor 170 and the rear radar sensor 172 are arranged, for example, on the front bumper and the rear bumper (both not shown) of the vehicle 102 to generate sensor signals for the external environment in front of and behind the vehicle 102, respectively.

The radar information acquisition device 122 acquires sensor signals for the external environment in front of and behind the vehicle 102 from the front radar sensor 170 and the rear radar sensor 172, respectively, by the receiving device 174, and the vehicle is based on the acquired sensor signals. It generates sensing information indicating the presence or absence of an object in the external environment in front of and behind the 102 and the position of the object. Further, the radar information acquisition device 122 transmits the generated sensing information to the driver support device 118.

The transmission line abnormality detecting device 106 is mounted on the vehicle 102 connected to the AV device 108, the GPS receiving device 110, the ETC device 112, and the TCU 114, which are wireless receiving devices that receive radio signals transmitted from the outside of the vehicle 102. Together with the antennas 132a, 132b, 132c, 132d, 132e, 132f (hereinafter, also collectively referred to as antenna 132), the transmission line abnormality detection system 100 is configured.

The transmission line abnormality detecting device 106 receives a radio wave including the radio signal and the radiated electromagnetic wave radiated from the signal transmission line 126 via the antenna 132, and detects the occurrence of an abnormality in the signal transmission line 126. .. As shown in FIG. 1, in the present embodiment, for example, the antenna wire, which is a lead wire connected to the antenna 132, is branched. The transmission line abnormality detecting device 106 acquires the radio wave received by the antenna 132 via the branched antenna wire.

Specifically, the transmission line abnormality detecting device 106 includes a processing device 180, a storage device 182, a spectrum separation circuit 184, a radio wave receiving circuit 186, and a NW communication device 188. The NW communication device 188 is a transmitter / receiver for communicating with other devices such as the AV device 108 via the vehicle-mounted network bus 124, and is composed of, for example, a CAN transceiver. The storage device 182 is composed of, for example, a volatile and / or non-volatile semiconductor memory, or a hard disk device or the like.

The radio wave receiving circuit 186 is a radio wave receiving unit, and the radio waves received by each of the antennas 132a, 132b, 132c, 132d, 132e, and 132f are sequentially switched, for example, from the antennas 132, at predetermined time intervals. Get it repeatedly. Then, the radio wave receiving circuit 186 repeatedly outputs the acquired radio wave to the spectrum separation circuit 184 at predetermined time intervals. For example, the radio wave receiving circuit 186 extracts radio waves in the reception frequency band of the AV device 108, the GPS receiving device 110, the ETC device 112, and the TCU 114, which are wireless devices, from the radio waves received from the antenna 132, and is a spectrum separation circuit. Output to 184. Here, the reception frequency band is the frequency band of AM radio broadcasting, FM radio broadcasting, and TV broadcasting corresponding to the radio waves received by the antennas 132a, 132b, and 132c in the AV device 108.

The spectrum separation circuit 184 corresponds to each antenna 132 (that is, the reception corresponding to each antenna 132) for the radio waves in the reception frequency band for each antenna 132 received from the radio wave receiving circuit 186 at predetermined time intervals. Separate the frequency components of the target frequency and the non-target frequency (in each of the frequency bands). Then, the spectrum separation circuit 184 outputs radio wave intensity information indicating the radio wave intensity of the target frequency and the radio wave intensity of the non-target frequency for each antenna 132 to the processing device 180 at the predetermined time interval.

Here, the target frequency means a frequency intended to be received by the radio receiving device corresponding to each antenna 132, and for example, in the antennas 132a, 132b and 132c connected to the AV device 108, the target frequency is The frequencies of AM radio stations, FM radio stations, and television stations. Further, the target frequencies of the antennas 132d, 132e, and 132f are the GPS radio frequency to be received by the GPS receiving device 110, the ETC device 112, and the TCU 114 connected to these antennas, respectively, and communication with the roadside device of the ETC system. Frequency for, and radio frequency used for connection with the Internet and the like. The non-target frequency means a frequency other than the target frequency.

The spectrum separation circuit 184, for example, provides radio wave intensity information indicating, for example, the radio wave intensity at one target frequency and the radio wave intensity at the non-target frequency having the largest radio wave intensity among the non-target frequencies for each of the antennas 132. It is transmitted to the processing device 180.

The processing device 180 is, for example, a computer including a processor such as a CPU. The processing device 180 may be configured to include a ROM in which a program is written, a RAM for temporarily storing data, and the like. The processing device 180 includes an SN calculation unit 190 and an abnormality determination unit 192 as functional elements or functional units.

The SN calculation unit 190 repeatedly calculates the signal-to-noise ratio of the radio signal included in the radio wave received via the antenna 132 at a predetermined time interval. Specifically, the SN calculation unit 190 of the antenna 132 is based on the radio intensity of each target frequency of the antenna 132 and the radio strength of the non-target frequency acquired from the spectrum separation circuit 184 at predetermined time intervals. The SN ratio (signal-to-noise ratio, Signal-to-Noise Radio) of the radio waves received by each is repeatedly calculated at predetermined time intervals.

In addition, every time the SN calculation unit 190 calculates the SN ratio, the moving average value of the SN ratio is calculated from the latest predetermined number of SN ratio calculation results, and the calculated moving average value can be used as the SN ratio calculated this time. good. As a result, the radio field intensity of the target frequency temporarily increases or decreases as the vehicle 102 travels in a building area or the like, and as a result, an abnormality determination unit 192, which will be described later, causes a determination error regarding a signal transmission line abnormality. It is possible to prevent it from being stored.

The abnormality determination unit 192 determines whether or not there is an abnormality in the signal transmission lines 126a, 126b, 126c, 126d, 126e based on the SN ratio of the radio wave received by each of the antennas 132 calculated by the SN calculation unit 190. Hereinafter, the SN ratio of the radio wave received by each of the antennas 132 is referred to as the SN ratio for each antenna 132. Further, the signal transmission lines 126a, 126b, 126c, 126d, and 126e are collectively referred to as a signal transmission line 126.

Specifically, the abnormality determination unit 192 determines whether or not any value of the SN ratio for each antenna 132 is less than a predetermined threshold value each time the SN calculation unit 190 calculates the SN ratio. If it is less than the threshold value, it is determined that an abnormality has occurred in any of the signal transmission lines 126. When a disconnection failure or a shield abnormality due to coating wear occurs in the signal transmission line 126, the signal transmitted by the signal transmission line 126 becomes a radiated electromagnetic wave and is easily emitted into the air. This radiated electromagnetic wave causes deterioration of the SN ratio in a wireless receiving device such as the AV device 108. Therefore, when the SN ratio for each antenna 132 is less than a predetermined value, it can be determined that an abnormality has occurred in any of the signal transmission lines 126.

In the above transmission line abnormality detection system 100, the vehicle 102 uses the antenna 132 of the AV device 108, the GPS receiver 110, the ETC device 112, and the TCU 114, which are usually used in general vehicles, without using a dedicated or additional sensor. It is possible to detect the presence or absence of an abnormality such as disconnection in the signal transmission line 126 composed of the wire harness or the like provided in the above.

Next, an example of the operation procedure in the transmission line abnormality detection system 100 will be described. FIG. 2 is a flow chart showing a processing procedure in the transmission line abnormality detection system 100. This process starts when the power of the transmission line abnormality detection device 106 constituting the transmission line abnormality detection system 100 is turned on, and ends when the power is turned off.

When the process is started, first, the transmission line abnormality detecting device 106 receives the radio wave by the radio wave receiving circuit 186 via the in-vehicle antenna 132 (S100). Next, the transmission line abnormality detection device 106 calculates the SN ratio of the received radio wave by the SN calculation unit 190 (S102). As described above, the SN ratio can be calculated based on the radio wave strength of the target frequency and the non-target frequency separated by the spectrum separation circuit 184 for the received radio wave for each antenna 132.

Next, the abnormality determination unit 192 of the transmission line abnormality detection device 106 determines whether or not the calculated SN ratio is a predetermined value abnormality (S104). Then, when all of the calculated SN ratios are equal to or higher than the predetermined values (S104, YES), the abnormality determination unit 192 notifies, for example, the driver support device 118 that the signal transmission line is normal (S104, YES). S106), the process is returned to step S100.

On the other hand, when any of the calculated SN ratios is less than a predetermined value (S104, NO), the abnormality determination unit 192 notifies, for example, the driver support device 118 that the signal transmission line is abnormal. (S106), the process returns to step S100. As a result, the driver support device 118 that has received the above notification assumes that, for example, either the image information from the camera image acquisition device 120 or the sensing information from the radar information acquisition device 122 is invalid. You can disable the driving assistance you rely on.

The present invention is not limited to the configuration of the above embodiment, and can be implemented in various embodiments without departing from the gist thereof.

For example, in the above-described embodiment, the vehicle 102, which is a moving body, is not limited to the vehicle 102 driven by a motor or an internal combustion engine. The vehicle 102 is a moving body on land and / or sea such as a motorcycle, an electric bicycle, a train, a trolleybus, and a motor boat, and a cable is connected between a sensor such as a camera and a control device in the moving body. It can be any mobile body that needs to communicate via.

Further, the abnormality determination unit 192 determines whether or not there is an abnormality in the signal transmission line 126 each time the SN calculation unit 190 calculates the SN ratio, but the present invention is not limited to this. For example, the SN calculation unit 190 stores the repeatedly calculated SN ratio for each antenna 132 in the storage device 182 in time series, and the abnormality determination unit 192 determines the deterioration tendency of the SN ratio for each antenna 132. , It can be determined whether or not there is an abnormality in the signal transmission line 126.

Specifically, the abnormality determination unit 192 may, for example, have a predetermined length period (for example, the most recent past week) of the SN ratio of the time series repeatedly calculated described above for any of the antennas 132. When the amount of decrease in the signal transmission line 126 exceeds a predetermined value, it can be determined that an abnormality has occurred in the signal transmission line 126. As a result, for example, when the vehicle 102 travels in a place where the TV broadcast radio wave is difficult to reach, such as a tunnel or a building street, the antenna that receives the TV broadcast radio wave from the decrease in the radio wave strength of the TV signal (that is, the radio wave strength of the target frequency). It is possible to prevent the SN ratio of 132c from being lowered and the abnormality determination unit 192 from erroneously immediately determining that the signal transmission line 126 is abnormal.

Further, in the above-described embodiment, the SN ratio for each antenna 132 is calculated from the radio waves received by using the antenna 132s of the AV device 108, the GPS receiving device 110, the ETC device 112, and the TCU 114, which are wireless receiving devices. When the SN ratio of the antenna 132 is less than a predetermined value, it is determined that the signal transmission line 126 has an abnormality, but the present invention is not limited to this. Only one antenna of any one wireless receiving device, for example, the antenna 132a of the AV device 108 may be used to determine the presence or absence of an abnormality in the signal transmission line 126 based on the radio wave received from the antenna 132a. ..

In this case, the radio wave receiving circuit 186 transmits the received radio wave signal received from the antenna 132a to the spectrum separation circuit 184, and the spectrum separation circuit 184 is a radio wave having a target frequency and a non-target frequency of the AM radio receiving device of the AV device 108. The intensity information may be transmitted to the processing device 180. The SN calculation unit 190 calculates the SN ratio from the radio wave intensities of the target frequency and the non-target frequency of the received AV device 108, and the abnormality determination unit 192 indicates one of the signals when the SN ratio is less than a predetermined value. It can be determined that there is an abnormality in the transmission line 126.

However, by using a plurality of antennas 132 as in the present embodiment, it is possible to grasp the approximate position of the abnormality in the signal transmission line 126. That is, it can be determined that there is an abnormal portion of the signal transmission line 126 near the antenna 132 of the radio receiving device corresponding to the SN ratio having the largest degree of deterioration among the SN ratios of each antenna 132.

Further, for example, as shown in FIG. 3, if a plurality of antennas 132 are distributed and arranged in the vehicle 102, the position of the abnormality in the signal transmission line 126 is further determined from the degree of deterioration of the SN ratio of each antenna 132. It is also possible to narrow down. In the example shown in FIG. 3, the antenna 132a, which is the AM radio antenna of the AV device 108, is arranged outside the roof of the vehicle 102 as a roof antenna. Further, the FM radio antenna of the AV device 108 and the antennas 132b and 132c, which are TV antennas, are arranged on the windshield of the vehicle 102 as film antennas. Further, the antennas 132d and 132e of the GPS receiving device 110 and the ETC device 112 are arranged at the left and right ends of the dashboard of the vehicle 102 as antenna boxes containing the chip antennas, respectively. Further, the antenna 132f of the TCU 114 is arranged in the central portion of the vehicle 102 as a chip antenna arranged in the housing of the TCU 114.

In the arrangement of the antenna 132 shown in FIG. 3, based on the amount of deterioration of the SN ratio for each antenna 132, the approximate positions of the abnormal points of the signal transmission line 126 mounted on the vehicle 102 are, for example, six divided by the illustrated alternate long and short dash line. It is possible to detect by dividing into areas.

Further, in the above-described embodiment, the SN calculation unit 190 is provided in the transmission line abnormality detection device 106, but the present invention is not limited to this. The SN calculation unit 190 may be provided in each of the AV device 108, the GPS receiving device 110, the ETC device 112, and the TCU 114, which are wireless receiving devices.

For example, the AV device 108 is provided with an SN calculation unit that calculates the respective SN ratios of the radio waves received from the AM radio antenna, the FM radio antenna, and the TV antennas 132a, 132b, and 132c, respectively. Can be. Further, the GPS receiving device 110, the ETC device 112, and the TCU 114 shall be provided with an SN calculation unit that calculates the respective SN ratios of the radio waves received from the antennas 132d, 132e, and 132f, respectively. Can be done.

In this case, the transmission line abnormality detection system 100 is configured to include an AV device 108, a GPS receiving device 110, an ETC device 112, and a TCU 114 to which an SN calculation unit is arranged, or is arranged in these devices. It is configured to include the SN calculation unit. In addition, the SN calculation unit arranged in the wireless receiver as described above receives the radio wave intensity from the spectrum separation circuit 184 described above, and instead of receiving the radio wave intensity, the tuning circuit tuning that can be generally connected to the corresponding antenna 132 is tuned. The frequency can be scanned to acquire the radio wave intensity of a predetermined target frequency and the radio wave intensity of a non-target frequency, respectively, and the SN ratio can be calculated from these radio wave intensities acquired in this phase.

As described above, the above-mentioned transmission line abnormality detection system 100 detects an abnormality in the signal transmission line 126 provided in the moving vehicle 102. The transmission line abnormality detection system 100 is connected to an AV device 108 or the like, which is a radio wave receiving device for receiving a radio signal transmitted from the outside of the vehicle 102, via an antenna 132 mounted on the vehicle 102 and an antenna 132. Includes a radio wave receiving circuit 186, which is a radio wave receiving unit for receiving radio waves. Further, the transmission line abnormality detection system 100 has an SN calculation unit 190 that repeatedly calculates the signal-to-noise ratio of the radio signal included in the received radio wave at a predetermined time interval, and the calculated SN ratio. It has an abnormality determination unit 192 for determining the presence or absence of an abnormality in the signal transmission line 126 based on the above.

According to this configuration, it is possible to detect an abnormality such as a disconnection of the signal transmission line 126 composed of a wire harness or the like provided in the vehicle 102 without using a dedicated sensor or the like.

Further, in the transmission line abnormality detection system 100, the abnormality determination unit 192 uses the latest predetermined length of the SN ratio calculated by the SN calculation unit 190 to be smaller than the predetermined value and / or the SN ratio repeatedly calculated by the SN calculation unit 190. When the amount of decrease in the period exceeds a predetermined value, it is determined that an abnormality has occurred in the signal transmission line 126. According to this configuration, it is possible to easily determine whether or not there is an abnormality in the signal transmission line 126 by a simple determination process.

Further, in the transmission line abnormality detection system 100, the wireless receiving device is a radio broadcasting receiving device and / or a television broadcasting receiving device included in the AV device 108 mounted on the vehicle 102, and a GPS receiving device 110 and an ETC radio wave receiving device. It can be the ETC device 112, and / or the TCU 114. According to this configuration, it is possible to detect an abnormality such as a disconnection of the signal transmission line 126 by using an antenna connected to a wireless receiving device generally provided in a vehicle.

Further, the transmission line abnormality detecting device 106 according to the above-described embodiment detects an abnormality in the signal transmission line 126 provided in the vehicle 102. The transmission path abnormality detecting device 106 is a radio wave receiving unit that receives radio waves via an in-vehicle antenna 132 connected to a wireless receiving device such as an AV device 108 that receives a radio signal transmitted from the outside of the vehicle 102. A receiving circuit 186 is provided. The transmission line abnormality detection device 106 also has an SN calculation unit 190 that repeatedly calculates the signal-to-noise ratio of the radio signal included in the received radio wave at predetermined time intervals, and the calculated SN ratio. It is provided with an abnormality determination unit 192 for determining the presence or absence of an abnormality in the signal transmission line 126 based on the above.

According to this configuration, it is possible to detect an abnormality such as a disconnection of the signal transmission line 126 composed of a wire harness or the like provided in the vehicle 102 without using a dedicated sensor or the like.

100 ... Transmission line abnormality detection system, 102 ... Vehicle, 106 ... Transmission line abnormality detection device, 108 ... AV device, 110 ... GPS receiver, 112 ... ETC device, 114 ... TCU, 116 ... Navigation device, 118 ... Driver support Device, 120 ... Camera image acquisition device, 122 ... Radar information acquisition device, 124 ... In-vehicle network bus, 126, 126a, 126b, 126c, 126d, 126e, 126f ... Signal transmission line, 132, 132a, 132b, 132c, 132d, 132e, 132f ... antenna, 150 ... front camera, 152 ... rear camera, 154 ... right side camera, 156 ... left side camera, 160, 174 ... receiver, 162, 176 ... transmitter, 164, 178, 188 ... NW communication Device, 170 ... forward radar sensor, 172 ... rear radar sensor, 180 ... processing device, 182 ... storage device, 184 ... spectrum separation circuit, 186 ... radio wave receiving circuit, 190 ... SN calculation unit, 192 ... abnormality determination unit.

Claims (4)

It is a transmission line abnormality detection system that detects an abnormality in a signal transmission line provided in a moving body.
An antenna mounted on the mobile body connected to a wireless receiving device that receives a wireless signal transmitted from the outside of the mobile body, and an antenna mounted on the mobile body.
A radio wave receiving unit that receives radio waves via the antenna,
An SN calculation unit that repeatedly calculates the signal-to-noise ratio of the radio signal included in the received radio wave at predetermined time intervals, and
An abnormality determination unit that determines whether or not there is an abnormality in the signal transmission line based on the calculated signal-to-noise ratio, and
Have,
Transmission line abnormality detection system. The abnormality determination unit is used when the calculated signal-to-noise ratio is smaller than a predetermined value, or when the amount of decrease in the repeatedly calculated signal-to-noise ratio in the latest predetermined length period exceeds a predetermined value. , It is determined that an abnormality has occurred in the signal transmission line.
The transmission line abnormality detection system according to claim 1. The transmission line according to claim 1 or 2, wherein the radio receiving device is a radio broadcasting receiving device, a television broadcasting receiving device, a GPS receiving device, an ETC radio wave receiving device, and / or a telematics control unit mounted on the mobile body. Abnormality detection system. It is a transmission line abnormality detection device that detects an abnormality in a signal transmission line provided in a moving body.
A radio wave receiving unit that receives radio waves via an antenna mounted on the moving body connected to a wireless receiving device that receives a radio signal transmitted from the outside of the moving body.
An SN calculation unit that repeatedly calculates the signal-to-noise ratio of the radio signal included in the received radio wave at predetermined time intervals, and
An abnormality determination unit that determines whether or not there is an abnormality in the signal transmission line based on the calculated signal-to-noise ratio, and
To prepare
Transmission line abnormality detection device.

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