JP2015082306A - Communication system, on-vehicle devices and center server, and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To identify an on-vehicle device in which a failure occurs among on-vehicle devices having radio communication functions.SOLUTION: A first vehicle equipped with a first on-vehicle device and a second vehicle equipped with a second on-vehicle device cooperatively execute compliance control. The first on-vehicle device is configured to: acquire travel state information of the first vehicle; wirelessly transmit the travel state information of the first vehicle; increase a counter value of a first abnormality counter on the basis of an abnormality notification signal received from the second on-vehicle device; and notify the first vehicle of a failure when the counter value of the first abnormality counter is equal to or more than a threshold. The second on-vehicle device is configured to: receive the travel state information of the first vehicle from the first on-vehicle device; acquire travel state information of the second vehicle; create an abnormality notification signal when there is inconsistency between the travel state information of the second vehicle and the travel state information of the first vehicle; wirelessly transmit the abnormality notification signal; increase a counter value of a second abnormality counter; stop the compliance control when the counter value of the second abnormality counter is equal to or more than a threshold; and notify the second vehicle of a failure.

Description

  The present invention relates to a communication system.

  A communication system that performs communication according to a road-to-vehicle communication protocol or a vehicle-to-vehicle communication protocol is known. In this communication system, a parameter indicating a communication state defined in a predetermined layer of the protocol is detected, and the detected parameter is compared with a predetermined threshold value. Communication error information including at least one of the following is detected. Further, the communication system detects the communication time in the corresponding layer of the protocol, calculates the communication abnormality rate of the wireless communication unit, and compares the communication abnormality rate with a predetermined threshold value to reduce the deterioration of the wireless communication unit It detects (for example, refer patent document 1).

JP 2012-4759 A

  In the technology for detecting the deterioration of the wireless communication unit by comparing the communication error rate with a predetermined threshold to check the communication state, which wireless communication unit is one of the two wireless communication units that transmit and receive signals. It is not possible to determine whether it has deteriorated.

  The present invention is to identify an in-vehicle device in which a failure has occurred among in-vehicle devices having a wireless communication function for transmitting and receiving signals.

A communication system according to an embodiment of the disclosure includes:
A communication system comprising a first in-vehicle device and a second in-vehicle device,
After the follow-up control is executed between the first vehicle on which the first vehicle-mounted device is mounted and the second vehicle on which the second vehicle-mounted device is mounted,
The first in-vehicle device is:
A first control unit for obtaining information relating to a traveling state of the first vehicle;
A first wireless communication unit that wirelessly transmits information related to the traveling state of the first vehicle acquired by the first control unit;
The first wireless communication unit receives an abnormality notification signal for notifying that an abnormality has occurred from the second in-vehicle device,
The first control unit increases a count value of a first abnormality counter that counts the number of times an abnormality has occurred based on the abnormality notification signal, and the count value of the first abnormality counter is equal to or greater than a threshold value. If notifying the first vehicle that it is out of order,
The second in-vehicle device is
A second wireless communication unit that receives information on a traveling state of the first vehicle from the first vehicle-mounted device;
Information is acquired on the running state of the second vehicle, and an abnormality has occurred when there is a contradiction between the information on the running state of the second vehicle and the information on the running state of the first vehicle. When the abnormality notification signal to be notified is created, the count value of the second abnormality counter that counts the number of times the abnormality has occurred is increased, and when the count value of the second abnormality counter is greater than or equal to the threshold value, the follow-up control And a second control unit for notifying the second vehicle of a failure, and
The second wireless communication unit wirelessly transmits the abnormality notification signal to the first in-vehicle device.

  According to the disclosed embodiment, it is possible to identify an in-vehicle device in which a failure has occurred among in-vehicle devices having a wireless communication function for transmitting and receiving signals.

It is a figure which shows one Example of a communication system. It is a figure which shows an example of communication between vehicles. It is a figure which shows one Example of a 1st control part. It is a functional block diagram which shows one Example of a 1st control part. It is a figure which shows one Example of a 2nd control part. It is a functional block diagram which shows one Example of a 2nd control part. It is a sequence chart which shows one Example of operation | movement of a communication system. It is a figure which shows the modification of a communication system. It is a figure which shows an example of a center server. It is a figure which shows an example of an abnormality counter table. It is a sequence chart which shows one Example of operation | movement of a communication system.

Next, the form for implementing this invention is demonstrated, referring drawings based on the following Examples. Examples described below are merely examples, and embodiments to which the present invention is applied are not limited to the following examples.
In all the drawings for explaining the embodiments, the same reference numerals are used for those having the same function, and repeated explanation is omitted.

<Example>
<Communication system>
FIG. 1 shows an embodiment of a communication system.

  The communication system includes a plurality of in-vehicle devices having a wireless communication function. In the example shown in FIG. 1, a first in-vehicle device 100 and a second in-vehicle device 200 are shown. There may be three or more in-vehicle devices.

  The first vehicle-mounted device 100 and the second vehicle-mounted device 200 are mounted on a moving body such as a vehicle, for example. One embodiment of a communication system is mounted on a vehicle.

  FIG. 2 shows an example in which vehicle-to-vehicle communication is performed between in-vehicle devices mounted on a vehicle. In the example shown in FIG. 2, the first in-vehicle device 100 is mounted on the preceding vehicle, and the second on-vehicle device 200 is mounted on the following vehicle.

  The first in-vehicle device 100 acquires the first vehicle speed information and the first position information of the preceding vehicle and wirelessly transmits them to the following vehicle.

  The second vehicle-mounted device 200 receives the first vehicle speed information and the first position information wirelessly transmitted from the first vehicle-mounted device 100.

  The second vehicle-mounted device 200 acquires second vehicle speed information and second position information of the following vehicle, and acquires inter-vehicle distance information between the preceding vehicle and the following vehicle.

  The second vehicle-mounted device 200 calculates a first distance between the first position represented by the first position information and the second position represented by the second position information, and the first distance It is determined whether or not there is a contradiction between the distance and the second distance represented by the inter-vehicle distance information. Specifically, the second in-vehicle device 200 obtains a difference between the first distance and the second distance.

  The second vehicle-mounted device 200 determines that there is no contradiction between the first distance and the second distance when the difference between the first distance and the second distance is equal to or less than a predetermined threshold. In this case, the second in-vehicle device 200 continues the control for causing the preceding vehicle to follow the succeeding vehicle. For example, the second vehicle-mounted device 200 is configured so that the second vehicle speed of the subsequent vehicle is based on the first vehicle speed information and the second vehicle speed information so that the inter-vehicle distance between the preceding vehicle and the subsequent vehicle is within a predetermined range. Control the vehicle speed.

  It is assumed that an abnormality that is difficult to identify with only the first vehicle-mounted device 100 mounted on the preceding vehicle has occurred. For example, a case where an abnormality occurs in a GPS (Global Positioning System) satellite and a GPS signal transmitted from the GPS satellite is abnormal is applicable. In this case, the first position information acquired by the first in-vehicle device 100 is incorrect position information.

  The first in-vehicle device 100 acquires the first vehicle speed information and the first position information of the preceding vehicle and wirelessly transmits them to the following vehicle.

  The second vehicle-mounted device 200 receives the first vehicle speed information and the first position information wirelessly transmitted from the first vehicle-mounted device 100.

  The second vehicle-mounted device 200 acquires second vehicle speed information and second position information of the following vehicle, and acquires inter-vehicle distance information between the preceding vehicle and the following vehicle.

  The second vehicle-mounted device 200 calculates a first distance between the first position represented by the first position information and the second position represented by the second position information, and the first distance And whether there is a contradiction between the second distance represented by the inter-vehicle distance information.

  Specifically, the second in-vehicle device 200 obtains a difference between the first distance and the second distance. The second vehicle-mounted device 200 determines that there is no contradiction between the first distance and the second distance when the difference between the first distance and the second distance is equal to or less than a predetermined threshold.

  However, an error has occurred in the first position information due to an abnormal GPS signal transmitted from the GPS satellite. For this reason, the first distance is a large value, and the difference between the first distance and the second distance is assumed to be larger than a predetermined threshold. In this case, the second in-vehicle device 200 determines that there is a contradiction between the first distance and the second distance. When it is determined that there is a contradiction between the first distance and the second distance, the second in-vehicle device 200 stops the control for causing the preceding vehicle to follow the succeeding vehicle.

  Furthermore, when it is determined that there is a contradiction between the first distance and the second distance, the second vehicle-mounted device 200 transmits an abnormality notification signal for notifying the first vehicle-mounted device 100 of the abnormality, The count value of the second abnormality counter included in the second in-vehicle device 200 is increased. The second abnormality counter is a counter for counting the number of times that it is determined that there is a contradiction with the in-vehicle device that communicates with the second in-vehicle device 200. The second vehicle-mounted device 200 determines that a failure has occurred in the succeeding vehicle when the count value of the second abnormality counter is equal to or greater than a predetermined threshold value.

  When it is determined that a failure has occurred in the following vehicle, the second vehicle-mounted device 200 notifies the subsequent vehicle that the failure has occurred. By notifying the subsequent vehicle, a user such as a person riding in the subsequent vehicle is notified that a failure has occurred.

  The first in-vehicle device 100 receives the abnormality notification signal from the second in-vehicle device 200. The first vehicle-mounted device 100 increases the count value of the first abnormality counter included in the first vehicle-mounted device 100. The first abnormality counter is a counter for counting the number of times it is determined that there is a contradiction with the in-vehicle device that communicates with the first in-vehicle device 100. The first vehicle-mounted device 100 determines that a failure has occurred in the preceding vehicle when the count value of the first abnormality counter is equal to or greater than a predetermined threshold value.

  If it is determined that a failure has occurred in the preceding vehicle, the first vehicle-mounted device 100 notifies the preceding vehicle that a failure has occurred. By notifying the preceding vehicle, a user such as a person riding in the preceding vehicle is notified that a failure has occurred.

<First in-vehicle device 100>
Returning to FIG. 1, the description will be continued.

  The first vehicle-mounted device 100 includes a first wireless communication unit 102, a first control unit 104, and a first display unit 106.

  The first wireless communication unit 102 performs wireless communication with the second wireless communication unit 202 of the second in-vehicle device 200 according to the inter-vehicle communication protocol. For example, wireless communication is performed between the first wireless communication unit 102 and the second wireless communication unit 202 in accordance with wireless LAN standards such as IEEE802.11a, IEEE802.11b, and IEEE802.11g.

  The first display unit 106 includes a liquid crystal display, an organic EL display, and the like. When it is determined that a failure has occurred in the vehicle on which the first in-vehicle device 100 is mounted, the vehicle is displayed by displaying that fact. The user who is on the road is notified that a failure has occurred.

  The first control unit 104 is connected to the first wireless communication unit 102 and the first display unit 106. The first control unit 104 is configured by an electronic control unit or the like.

  FIG. 3 shows an embodiment of the first control unit 104. FIG. 3 mainly shows the hardware configuration of the first control unit 104.

  The first control unit 104 includes a microcontroller 1042. The microcontroller 1042 includes a CPU 1044, a ROM 1046, and a RAM 1048. The CPU 1044, the ROM 1046, and the RAM 1048 are connected to each other via a communication bus.

  The first control unit 104 includes a transceiver 1050, and the transceiver 1050 is connected to the microcontroller 1042.

  The first control unit 104 may include two or more transceivers. The first control unit 104 may include two or more microcontrollers.

  The CPU 1044 executes vehicle control. In one embodiment of the control of the vehicle, the CPU 1044 executes the control of acquiring the first vehicle speed information and the first position information of the preceding vehicle and wirelessly transmitting them.

  When an abnormality notification signal is input from the second in-vehicle device 200, the CPU 1044 increases the count value of the first abnormality counter. The CPU 1044 determines whether or not the count value of the first abnormality counter has reached or exceeded a predetermined threshold value. When the CPU 1044 determines that the count value of the first abnormality counter is equal to or greater than a predetermined threshold value, the CPU 1044 causes the first display unit 106 to display that a failure has occurred in the vehicle on which the first in-vehicle device 100 is mounted. Execute control.

  The ROM 1046 stores a program for vehicle control executed by the CPU 1044.

  The RAM 1048 temporarily stores data.

  The transceiver 1050 is connected to the microcontroller 1042. The transceiver 1050 inputs, to the first display unit 106, a control signal that is input from the microcontroller 1042 and displays that a failure has occurred in the vehicle on which the first in-vehicle device 100 is mounted. Further, the transceiver 1050 inputs data from the first wireless communication unit 102 to the microcontroller 1042.

<Function of first control unit 104>
FIG. 4 is a functional block diagram illustrating an example of the first control unit 104. The functions represented by the functional block diagram of FIG. 4 are mainly executed by the microcontroller 1042. That is, the microcontroller 1042 functions as the first information acquisition unit 1052 and the abnormality determination unit 1054.

  CPU 1044 mounted on microcontroller 1042 executes functions as first information acquisition unit 1052 and abnormality determination unit 1054 according to one or both of the application program stored in ROM 1046 and the firmware stored in CPU 1044. .

  The CPU 1044 functions as the first information acquisition unit 1052. The first information acquisition unit 1052 acquires first vehicle speed information and first position information of a vehicle on which the first in-vehicle device 100 is mounted. For example, the first information acquisition unit 1052 acquires first vehicle speed information from a vehicle speed sensor (not shown). The first information acquisition unit 1052 acquires first position information from a GPS receiver (not shown). The first information acquisition unit 1052 inputs the first vehicle speed information and the first position information to the transceiver 1050. The first vehicle speed information and the first position information input to the transceiver 1050 are input to the first wireless communication unit 102. The first wireless communication unit 102 wirelessly transmits the first vehicle speed information and the first position information. A wireless signal from the first wireless communication unit 102 is received by a nearby in-vehicle device.

  The CPU 1044 functions as the abnormality determination unit 1054. An abnormality notification signal from the second in-vehicle device 200 is input to the abnormality determination unit 1054 from the transceiver 1050. The abnormality determination unit 1054 has a first abnormality counter 1056. The abnormality determination unit 1054 increases the count value of the first abnormality counter 1056 when an abnormality notification signal is input. The abnormality determination unit 1054 determines whether or not the count value of the first abnormality counter 1056 is greater than or equal to a predetermined threshold value. When the abnormality determination unit 1054 determines that the count value of the first abnormality counter 1056 is equal to or greater than a predetermined threshold value, a failure has occurred in the vehicle in which the first in-vehicle device 100 is mounted on the first display unit 106. Input a control signal to display this.

  The abnormality determination unit 1054 may reset the first abnormality counter 1056 after a predetermined first period has elapsed. Even when the count value of the first abnormality counter 1056 is held indefinitely and the vehicle on which the first vehicle-mounted device 100 is installed is notified that a failure has occurred when the count value exceeds a predetermined threshold value, This is because the occurrence is often different from the actual situation.

  Further, the abnormality determination unit 1054 may decrease the count value of the first abnormality counter 1056 when an abnormality notification signal is not input during a predetermined second period. Even if the vehicle equipped with the first vehicle-mounted device 100 is notified that a failure has occurred when the count value of the first abnormality counter 1056 continues to increase indefinitely and exceeds a predetermined threshold, the failure This is because the occurrence of this is often different from the actual situation.

<Second vehicle-mounted device 200>
Returning to FIG.

  The second vehicle-mounted device 200 includes a second wireless communication unit 202, a second control unit 204, and a second display unit 206.

  The second wireless communication unit 202 performs wireless communication with the first wireless communication unit 102 according to the vehicle-to-vehicle communication protocol.

  The second display unit 206 is configured by a liquid crystal display, an organic EL display, or the like, and when it is determined that a failure has occurred in the vehicle on which the second in-vehicle device 200 is mounted, the vehicle is displayed by displaying that fact. The user who is on the road is notified that a failure has occurred.

  The second control unit 204 is connected to the second wireless communication unit 202 and the second display unit 206. The second control unit 204 is configured by an electronic control unit or the like.

  FIG. 5 shows an embodiment of the second control unit 204. FIG. 5 mainly shows the hardware configuration of the second control unit 204.

  The second control unit 204 includes a microcontroller 2042. The microcontroller 2042 includes a CPU 2044, a ROM 2046, and a RAM 2048. The CPU 2044, the ROM 2046, and the RAM 2048 are connected to each other via a communication bus.

  The second control unit 204 includes a transceiver 2050, and the transceiver 2050 is connected to the microcontroller 2042.

  The second control unit 204 may have two or more transceivers. In addition, the second control unit 204 may include two or more microcontrollers.

  The CPU 2044 executes vehicle control. In one embodiment of the control of the vehicle, the CPU 2044 acquires the first vehicle speed information and the first position information that are wirelessly transmitted from the first in-vehicle device 100. The CPU 2044 acquires second vehicle speed information and second position information of the following vehicle, and acquires inter-vehicle distance information between the preceding vehicle and the following vehicle. The CPU 2044 acquires inter-vehicle distance information from a distance measuring device equipped with a detection device such as a radar that detects the vehicle.

  The CPU 2044 calculates a first distance between the first position represented by the first position information and the second position represented by the second position information, and the first distance and the preceding vehicle are calculated. It is determined whether there is any contradiction with the second distance represented by the inter-vehicle distance information with the following vehicle. Specifically, the CPU 2044 obtains a difference between the first distance and the second distance.

  When the difference between the first distance and the second distance is equal to or less than a predetermined threshold, the CPU 2044 determines that there is no contradiction between the first distance and the second distance. In this case, the CPU 2044 continues the control for causing the preceding vehicle to follow the succeeding vehicle. For example, the CPU 2044 controls the second vehicle speed based on the first vehicle speed information and the second vehicle speed information so that the inter-vehicle distance between the preceding vehicle and the subsequent vehicle falls within a predetermined range.

  If the difference between the first distance and the second distance is greater than a predetermined threshold, the CPU 2044 determines that there is a contradiction between the first distance and the second distance. In this case, the CPU 2044 stops the control for causing the following vehicle to follow the preceding vehicle.

  Further, when it is determined that there is a contradiction between the first distance and the second distance, the CPU 2044 transmits an abnormality notification signal to the first vehicle-mounted device 100 and sets the count value of the second abnormality counter. increase. When the count value of the second abnormality counter becomes equal to or greater than a predetermined threshold, the CPU 2044 determines that a failure has occurred in the following vehicle.

  When the CPU 2044 determines that a failure has occurred in the following vehicle, the CPU 2044 inputs a control signal that causes the second display unit 208 to display that a failure has occurred in the vehicle on which the second in-vehicle device 200 is mounted.

  The ROM 2046 stores a program for vehicle control executed by the CPU 2044.

  The RAM 2048 temporarily stores data.

  The transceiver 2050 is connected to the microcontroller 2042. The transceiver 2050 inputs the abnormality notification signal input from the microcontroller 2042 to the second wireless communication unit 202. The transceiver 2050 inputs data from the second wireless communication unit 202 to the microcontroller 2042.

<Function of Second Control Unit 204>
FIG. 6 is a functional block diagram illustrating an example of the second control unit 204. The functions represented by the functional block diagram of FIG. 6 are mainly executed by the microcontroller 2042. That is, the microcontroller 2042 functions as a second information acquisition unit 2052, a position information determination unit 2054, a follow-up control unit 2056, and an abnormality determination unit 2058.

  The CPU 2044 mounted on the microcontroller 2042 has a second information acquisition unit 2052, a position information determination unit 2054, and a tracking control unit according to one or both of the application program stored in the ROM 2046 and the firmware stored in the CPU 2044. 2056 and the function as the abnormality determination unit 2058 are executed.

  The CPU 2044 functions as the second information acquisition unit 2052. The second information acquisition unit 2052 acquires second vehicle speed information and second position information of a vehicle on which the second in-vehicle device 200 is mounted. For example, the second information acquisition unit 2052 acquires second vehicle speed information from a vehicle speed sensor (not shown). The second information acquisition unit 2052 acquires second position information from a GPS receiver (not shown). The second information acquisition unit 2052 inputs the second vehicle speed information and the second position information to the position information determination unit 2054.

  The CPU 2044 functions as the position information determination unit 2054. The position information determination unit 2054 is connected to the second information acquisition unit 2052. The position information determination unit 2054 receives the first position information from the second wireless communication unit 202. The position information determination unit 2054 receives inter-vehicle distance information between the preceding vehicle and the following vehicle.

  The position information determination unit 2054 is represented by the first distance between the first position represented by the first position information and the second position represented by the second position information and the inter-vehicle distance information. It is determined whether or not there is a contradiction with the second distance.

  Specifically, the position information determination unit 2054 obtains a difference between the first distance and the second distance. The position information determination unit 2054 determines whether or not the difference between the first distance and the second distance is equal to or less than a predetermined threshold, thereby causing a contradiction between the first distance and the second distance. Judge whether or not there is. The position information determination unit 2054 inputs a determination result as to whether or not there is a contradiction between the first distance and the second distance to the tracking control unit 2056.

  The position information determination unit 2054 determines that there is no contradiction between the first distance and the second distance when the difference between the first distance and the second distance is equal to or less than a predetermined threshold.

  The position information determination unit 2054 determines that there is a contradiction between the first distance and the second distance when the difference between the first distance and the second distance is greater than a predetermined threshold. In this case, the position information determination unit 2054 inputs an abnormality notification signal to be transmitted to the first in-vehicle device 100 to the second wireless communication unit 202, and the abnormality determination unit 2058 receives the first distance and the second distance. Notify that there is a contradiction between

  The CPU 2044 functions as the follow-up control unit 2056. The follow-up control unit 2056 is connected to the second information acquisition unit 2052, the position information determination unit 2054, and the second wireless communication unit 202. The follow-up control unit 2056 acquires the second vehicle speed information from the second information acquisition unit 2052. The follow-up control unit 2056 receives the first vehicle speed information from the second wireless communication unit 202. The follow-up control unit 2056 executes control for causing the preceding vehicle to follow the succeeding vehicle. For example, the follow-up control unit 2056 controls the second vehicle speed based on the first vehicle speed information and the second vehicle speed information so that the inter-vehicle distance between the preceding vehicle and the following vehicle is within a predetermined range. .

  If the determination result whether there is no contradiction between the first distance and the second distance input from the position information determination unit 2054 indicates that there is no contradiction, the tracking control unit 2056 Continue to control the following vehicle to follow.

  The follow-up control unit 2056 determines that there is a contradiction between the first distance and the second distance input from the position information determination unit 2054 and indicates that there is a contradiction. Stop the control to follow the following vehicle.

  The CPU 2044 functions as the abnormality determination unit 2058. Abnormality determination unit 2058 is connected to position information determination unit 2054. The abnormality determination unit 2058 has a second abnormality counter 2060. The abnormality determination unit 2058 increases the count value of the second abnormality counter 2060 when notified from the position information determination unit 2054 that there is a contradiction between the first distance and the second distance. The abnormality determination unit 2058 determines whether or not the count value of the second abnormality counter 2060 is equal to or greater than a predetermined threshold value.

  When the abnormality determination unit 2058 determines that the count value of the second abnormality counter 2060 is equal to or greater than a predetermined threshold value, a failure has occurred in the vehicle on which the second in-vehicle device 200 is mounted on the second display unit 206. Input a control signal to display this.

  The abnormality determination unit 2058 may reset the second abnormality counter 2060 after a predetermined first period has elapsed. Even if the vehicle equipped with the second vehicle-mounted device 200 is notified that a failure has occurred when the count value of the second abnormality counter 2060 is held indefinitely and exceeds a predetermined threshold value, This is because the occurrence is often different from the actual situation.

  In addition, the abnormality determination unit 2058, when it is not notified that there is a contradiction between the first distance and the second distance during the predetermined second period, the count value of the second abnormality counter 2060 May be reduced. Even if the vehicle equipped with the second vehicle-mounted device 200 is notified that a failure has occurred when the count value of the second abnormality counter 2060 continues to increase indefinitely and exceeds a predetermined threshold, the failure This is because the occurrence of this is often different from the actual situation.

  In one embodiment of the communication system, for convenience of explanation, the function of the first control unit 104 of the first vehicle-mounted device 100 and the function of the second control unit 204 of the second vehicle-mounted device 200 are shown in FIGS. The explanation was divided into six. However, in practice, the first control unit 104 has a function represented by the functional block diagram of the second control unit 204 shown in FIG. 6, and the second control unit 204 has the function shown in FIG. 1 has a function represented by a functional block diagram of the control unit 104.

  That is, when the vehicle on which the first vehicle-mounted device 100 is mounted becomes a succeeding vehicle, the first control unit 104 functions according to the functional block diagram of the second control unit 204 shown in FIG. When the vehicle on which the second vehicle-mounted device 200 is mounted becomes a preceding vehicle, the second control unit 204 functions according to the functional block diagram of the first control unit 104 shown in FIG. In this case, you may integrate the functional block which has the same function as needed.

<Operation of communication system>
FIG. 7 shows an embodiment of the operation of the communication system.

  In step S <b> 702, the second vehicle-mounted device 200 performs control to cause the preceding vehicle on which the first vehicle-mounted device 100 is mounted to follow the vehicle on which the second vehicle-mounted device 200 is mounted.

  In step S704, the first in-vehicle device 100 acquires first vehicle speed information and first position information.

  In step S706, the first vehicle-mounted device 100 wirelessly transmits the first vehicle speed information and the first position information to the second vehicle-mounted device 200.

  In step S708, the second in-vehicle device 200 receives the first vehicle speed information and the first position information.

  In step S710, the second in-vehicle device 200 acquires the second vehicle speed information and the second position information, and acquires the inter-vehicle distance information.

  In step S712, the second vehicle-mounted device 200 uses the distance between the first position represented by the first position information and the second position represented by the second position information, and the inter-vehicle distance information. It is determined whether or not there is a discrepancy between the expressed second distance. That is, the second in-vehicle device 200 determines whether or not the difference between the first distance between the first position and the second position and the second distance is equal to or less than a predetermined threshold value.

  In step S714, when it is determined that there is no contradiction between the first distance and the second distance, the second in-vehicle device 200 continues the control for causing the preceding vehicle to follow the following vehicle. That is, when the difference between the first distance and the second distance is equal to or less than a predetermined threshold, the second vehicle-mounted device 200 continues control for causing the preceding vehicle to follow the succeeding vehicle.

  In step S716, when it is determined that there is a contradiction between the first distance and the second distance, the second in-vehicle device 200 stops the control for causing the preceding vehicle to follow the succeeding vehicle. That is, when the difference between the first distance and the second distance is larger than the predetermined threshold, the second in-vehicle device 200 stops the control for causing the preceding vehicle to follow the succeeding vehicle.

  In step S718, the second in-vehicle device 200 creates an abnormality notification signal.

  In step S720, the second in-vehicle device 200 transmits an abnormality notification signal to the first in-vehicle device 100.

  In step S722, the second vehicle-mounted device 200 increases the count value of the second abnormality counter 2060.

  In step S724, the second in-vehicle device 200 determines whether or not the count value of the second abnormality counter 2060 is equal to or greater than a threshold value. If the count value of the second abnormality counter 2060 is not greater than or equal to the threshold value, the process ends.

  In step S726, when the second vehicle-mounted device 200 determines that the count value of the second abnormality counter 2060 is equal to or greater than the threshold value, the second vehicle-mounted device 200 notifies the subsequent vehicle that a failure has occurred.

  In step S728, the first vehicle-mounted device 100 receives the abnormality notification signal wirelessly transmitted by the second vehicle-mounted device 200.

  In step S730, the first in-vehicle device 100 increases the count value of the first abnormality counter 1056.

  In step S732, the first vehicle-mounted device 100 determines whether or not the count value of the first abnormality counter 1056 is equal to or greater than a threshold value. If the count value of the first abnormality counter 1056 is not greater than or equal to the threshold value, the process ends.

  In step S734, if the first vehicle-mounted device 100 determines that the count value of the first abnormality counter 1056 is equal to or greater than the threshold value, the first vehicle-mounted device 100 notifies the preceding vehicle that a failure has occurred.

  When the above-described processing is performed between a plurality of vehicles, the count value of the abnormality counter of the in-vehicle device in which the failure has occurred continues to increase, and the failure has occurred due to the count value exceeding the threshold value. It is notified that a failure has occurred in the vehicle equipped with the in-vehicle device.

  On the other hand, it is assumed that the increase in the count value of the abnormality counter of the in-vehicle device in which no failure has occurred rarely exceeds the threshold value. For this reason, it is possible to prevent erroneous determination that a failure has occurred even though no failure has occurred.

<Modification>
<Communication system>
FIG. 8 shows a modification of the communication system.

  As a modification of the communication system, a center server 400 is provided in the communication system described with reference to FIG.

  The first in-vehicle device 100 and the second in-vehicle device 200 are connected to the base station 300. Base station 300 is connected to center server 400 via communication network 500.

  The first in-vehicle device 100 includes a third wireless communication unit 103. The third wireless communication unit 103 is connected to the first control unit 104. Third wireless communication unit 103 performs wireless communication with base station 300. An example of the third wireless communication unit 103 is a data communication module (DCM). Either the first wireless communication unit 102 or the third wireless communication unit 103 performs wireless communication with the second vehicle-mounted device 200 and wireless communication with the base station 300. Also good.

  The second in-vehicle device 200 includes a fourth wireless communication unit 203. The fourth wireless communication unit 203 is connected to the second control unit 204. The fourth wireless communication unit 203 performs wireless communication with the base station 300. An example of the fourth wireless communication unit 203 is a data communication module. Either the second wireless communication unit 202 or the fourth wireless communication unit 203 performs wireless communication with the first vehicle-mounted device 100 and wireless communication with the base station 300. Also good.

  When the difference between the first distance and the second distance is greater than a predetermined threshold, the second in-vehicle device 200 stops the control for causing the preceding vehicle to follow the succeeding vehicle, and from the third wireless communication unit 103. An abnormality notification signal is transmitted to the center server 400. This abnormality notification signal is accompanied by the identifier of the first in-vehicle device 100 and the identifier of the second in-vehicle device 200.

  The center server 400 includes an abnormality counter table 410 that associates the in-vehicle device and the count value of the abnormality counter. The center server 400 increases the count value of the first abnormality counter corresponding to the first in-vehicle device 100 and increases the count value of the second abnormality counter corresponding to the second in-vehicle device 200.

  When the count value of the first abnormality counter becomes equal to or greater than a predetermined threshold value, the center server 400 notifies the first in-vehicle device 100 that an abnormality has occurred. Similarly, when the count value of the second abnormality counter becomes equal to or greater than a predetermined threshold, the center server 400 notifies the second in-vehicle device 200 that a failure has occurred.

  When the first onboard device 100 is notified from the center server 400 that a failure has occurred, the first onboard device 100 notifies the vehicle on which the first onboard device 100 is mounted that the failure has occurred. By notifying the vehicle on which the first vehicle-mounted device 100 is mounted, a user such as a person on the vehicle is notified that a failure has occurred.

  When the second in-vehicle device 200 is notified from the center server 400 that a failure has occurred, the second in-vehicle device 200 notifies the vehicle in which the second in-vehicle device 200 is mounted that the failure has occurred. By notifying the vehicle on which the first vehicle-mounted device 100 is mounted, a user such as a person on the vehicle is notified that a failure has occurred.

<Center server 400>
FIG. 9 shows an embodiment of the center server 400.

  The center server 400 includes a communication unit 402, a control unit 404, and a database 408. The control unit 404 includes an abnormality determination unit 406, and the database 408 stores an abnormality counter table 410.

  The communication unit 402 performs communication with the base station 300 via the communication network 500.

  The control unit 404 is connected to the communication unit 402 and executes control of the center server 400.

  When the abnormality notification signal is notified from the second vehicle-mounted device 200, the abnormality determination unit 406 increases the count value of the abnormality counter corresponding to the vehicle-mounted device attached to the abnormality notification signal. The abnormality determination unit 406 determines whether there is an in-vehicle device in which the count value of the abnormality counter is equal to or greater than a predetermined threshold value.

  When the abnormality determination unit 406 determines that there is a vehicle-mounted device whose abnormality counter count value is equal to or greater than a predetermined threshold, a failure occurs that is transmitted to the vehicle-mounted device whose abnormality counter value is equal to or greater than the predetermined threshold Create a notification signal. The abnormality determination unit 406 transmits a failure occurrence notification signal via the communication unit 402.

  The abnormality determination unit 406 may reset the abnormality counter after the elapse of a predetermined first period. This is because even when the vehicle is notified that a failure has occurred when the count value of the abnormality counter is held indefinitely and exceeds a predetermined threshold, the occurrence of the failure is often different from the actual situation.

  Further, the abnormality determination unit 406 may decrease the count value of the abnormality counter when the abnormality notification signal is not input during the predetermined second period. This is because even when the vehicle is notified that a failure has occurred when the count value of the abnormality counter continues to increase and becomes equal to or greater than a predetermined threshold, the failure often differs from the actual situation.

  The database 408 stores the abnormality counter table 410.

<Abnormal counter table 410>
FIG. 10 shows an example of the abnormality counter table 410.

  The abnormality counter table 410 stores the number of times that a contradiction has been detected between the first distance and the second distance (count value) for each vehicle-mounted device.

  In the example shown in FIG. 10, the count value of the abnormality counter of the first vehicle-mounted device 100 is “XX” times, and the count value of the abnormality counter of the second vehicle-mounted device 200 is “YY” times.

<Operation of communication system>
FIG. 11 shows an embodiment of the operation of the communication system.

  In step S <b> 1102, the second vehicle-mounted device 200 performs control for causing the preceding vehicle on which the first vehicle-mounted device 100 is mounted to follow the vehicle on which the second vehicle-mounted device 200 is mounted.

  In step S1104, the first in-vehicle device 100 acquires first vehicle speed information and first position information.

  In step S1106, the first vehicle-mounted device 100 wirelessly transmits the first vehicle speed information and the first position information to the second vehicle-mounted device 200.

  In step S1108, the second in-vehicle device 200 receives the first vehicle speed information and the first position information.

  In step S1110, the second vehicle-mounted device 200 acquires second vehicle speed information and second position information, and acquires inter-vehicle distance information.

  In step S1112, the second vehicle-mounted device 200 determines the first distance between the first position represented by the first position information and the second position represented by the second position information, It is determined whether or not there is a contradiction with the second distance represented by the distance information. That is, the second in-vehicle device 200 determines whether or not the difference between the first distance and the second distance is equal to or less than a predetermined threshold value.

  In step S1114, when it is determined that there is no contradiction between the first distance and the second distance, the second vehicle-mounted device 200 continues the control for causing the preceding vehicle to follow the following vehicle. That is, when the difference between the first distance and the second distance is equal to or less than a predetermined threshold, the second vehicle-mounted device 200 continues control for causing the preceding vehicle to follow the succeeding vehicle.

  In step S1116, when it is determined that there is a contradiction between the first distance and the second distance, the second vehicle-mounted device 200 stops the control for causing the preceding vehicle to follow the succeeding vehicle. That is, when the difference between the first distance and the second distance is larger than the predetermined threshold, the second in-vehicle device 200 stops the control for causing the preceding vehicle to follow the succeeding vehicle.

  In step S1118, the second in-vehicle device 200 creates an abnormality notification signal. This abnormality notification signal is accompanied by the identifier of the first in-vehicle device 100 and the identifier of the second in-vehicle device 200.

  In step S <b> 1120, the second in-vehicle device 200 transmits an abnormality notification signal to the center server 400.

  In step S1122, the center server 400 receives the abnormality notification signal.

  In step S1124, the center server 400 increases the count value of the first abnormality counter corresponding to the first in-vehicle device 100.

  In step S1126, the center server 400 determines whether or not the count value of the first abnormality counter is greater than or equal to the threshold value.

  In step S1128, when the center server 400 determines that the count value of the first abnormality counter is equal to or greater than the threshold value, the center server 400 creates a failure occurrence notification signal for notifying that a failure has occurred.

  In step S1130, the center server 400 transmits a failure occurrence notification signal to the first in-vehicle device 100.

  In step S1132, the first in-vehicle device 100 receives the failure occurrence notification signal.

  In step S1134, the first in-vehicle device 100 notifies the preceding vehicle that a failure has occurred.

  In step S1136, the center server 400 creates a failure occurrence notification signal in step S1128 or if the count value of the first abnormality counter is not equal to or greater than the threshold value, the center server 400 sets the second abnormality counter corresponding to the second vehicle-mounted device 200. Increase the count value.

  In step S1138, the center server 400 determines whether or not the count value of the second abnormality counter is greater than or equal to the threshold value. When the center server 400 determines that the count value of the second abnormality counter is less than the threshold value, the center server 400 ends.

  In step S1140, when the center server 400 determines that the count value of the second abnormality counter is equal to or greater than the threshold value, the center server 400 creates a failure occurrence notification signal for notifying that a failure has occurred.

  In step S1142, the center server 400 transmits a failure occurrence notification signal to the second in-vehicle device 200.

  In step S1144, the second in-vehicle device 200 receives the failure occurrence notification signal.

  In step S1146, the second in-vehicle device 200 notifies the following vehicle that a failure has occurred.

  When the above-described processing is performed between a plurality of vehicles, the count value of the abnormality counter of the in-vehicle device in which the failure has occurred continues to increase, and the failure has occurred due to the count value exceeding the threshold value. It is notified that a failure has occurred in the vehicle equipped with the in-vehicle device.

  On the other hand, it is assumed that the increase in the count value of the abnormality counter of the in-vehicle device in which no failure has occurred rarely exceeds the threshold value. For this reason, it is possible to prevent erroneous determination that a failure has occurred even though no failure has occurred.

  Furthermore, since the center server 400 determines whether to notify that a failure has occurred, the processing load on the in-vehicle device can be reduced.

  Although the present invention has been described above with reference to specific embodiments and modifications, each embodiment and modification is merely illustrative, and those skilled in the art will recognize various modifications, modifications, alternatives, and substitutions. You will understand examples. For convenience of explanation, the units according to the embodiments of the present invention have been described using functional block diagrams, but such units may be implemented in hardware, software, or a combination thereof. The present invention is not limited to the above-described embodiments, and various variations, modifications, alternatives, substitutions, and the like are included without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 1st vehicle equipment 102 1st radio | wireless communication part 103 3rd radio | wireless communication part 104 1st control part 106 1st display part 200 2nd vehicle-mounted apparatus 202 2nd radio | wireless communication part 203 4th radio | wireless Communication unit 204 Second control unit 206 Second display unit 300 Base station 400 Center server 402 Communication unit 404 Control unit 406 Abnormality determination unit 408 Database 410 Abnormal counter table 500 Communication network 1042, 2042 Microcontrollers 1044, 2044 CPU
1046, 2046 ROM
1048, 2048 RAM
1050, 2050 Transceiver 1052 First information acquisition unit 1054 Abnormality determination unit 1056 First abnormality counter 2052 Second information acquisition unit 2054 Position information determination unit 2056 Following control unit 2058 Abnormality determination unit 2060 Second abnormality counter

Claims (10)

A communication system comprising a first in-vehicle device and a second in-vehicle device,
After the follow-up control is executed between the first vehicle on which the first vehicle-mounted device is mounted and the second vehicle on which the second vehicle-mounted device is mounted,
The first in-vehicle device is:
A first control unit that acquires information related to the traveling state of the first vehicle, and a first wireless communication unit that wirelessly transmits information related to the traveling state of the first vehicle acquired by the first control unit. Prepared,
The first wireless communication unit receives an abnormality notification signal for notifying that an abnormality has occurred from the second in-vehicle device,
The first control unit increases a count value of a first abnormality counter that counts the number of times an abnormality has occurred based on the abnormality notification signal, and the count value of the first abnormality counter is equal to or greater than a threshold value. If notifying the first vehicle that it is out of order,
The second in-vehicle device is
A second wireless communication unit that receives information on a traveling state of the first vehicle from the first vehicle-mounted device;
Information is acquired on the running state of the second vehicle, and an abnormality has occurred when there is a contradiction between the information on the running state of the second vehicle and the information on the running state of the first vehicle. When the abnormality notification signal to be notified is created, the count value of the second abnormality counter that counts the number of times the abnormality has occurred is increased, and when the count value of the second abnormality counter is greater than or equal to the threshold value, the follow-up control And a second control unit for notifying the second vehicle of a failure, and
The second wireless communication unit is a communication system that wirelessly transmits the abnormality notification signal to the first vehicle-mounted device. An in-vehicle device,
After the follow-up control is executed between the first vehicle on which the other onboard device is mounted and the second vehicle on which the onboard device is mounted,
The in-vehicle device is
A wireless communication unit for receiving information on the traveling state of the first vehicle from the other vehicle-mounted device;
Information is acquired on the running state of the second vehicle, and an abnormality has occurred when there is a contradiction between the information on the running state of the second vehicle and the information on the running state of the first vehicle. In addition to creating an abnormality notification signal to be notified, the count value of the abnormality counter that counts the number of times an abnormality has occurred is increased, and when the count value of the abnormality counter is greater than or equal to a threshold value, the tracking control is stopped and A control unit for notifying the second vehicle that the vehicle is
The wireless communication unit wirelessly transmits the abnormality notification signal to the other vehicle-mounted device.   When the control unit does not detect any contradiction between the information related to the traveling state of the second vehicle and the information related to the traveling state of the first vehicle even after a predetermined time has elapsed, the count value of the abnormality counter The in-vehicle device according to claim 2, wherein the reset or count value is reduced. The wireless communication unit receives position information of the first vehicle as information related to a traveling state of the first vehicle from the other vehicle-mounted device,
The control unit acquires position information of the second vehicle and inter-vehicle distance information between the first vehicle and the second vehicle as information related to a traveling state of the second vehicle,
Based on the positional information of the first vehicle and the positional information of the second vehicle, a distance between the first vehicle and the second vehicle is obtained, and the distance and the inter-vehicle distance information are calculated. The in-vehicle device according to claim 2, wherein it is determined whether or not there is a contradiction between them. A communication system comprising a first in-vehicle device, a second in-vehicle device, and a center server,
After the follow-up control is executed between the first vehicle on which the first vehicle-mounted device is mounted and the second vehicle on which the second vehicle-mounted device is mounted,
The first in-vehicle device is:
A first control unit that acquires information related to the traveling state of the first vehicle, and a first wireless communication unit that wirelessly transmits information related to the traveling state of the first vehicle acquired by the first control unit. Prepared,
The first wireless communication unit receives a failure occurrence notification signal for notifying that a failure has occurred from the center server,
The first control unit notifies the first vehicle of a failure based on the failure occurrence notification signal,
The second in-vehicle device is
A second wireless communication unit that receives information on a traveling state of the first vehicle from the first vehicle-mounted device;
Information is acquired on the running state of the second vehicle, and an abnormality has occurred when there is a contradiction between the information on the running state of the second vehicle and the information on the running state of the first vehicle. A second control unit that creates an abnormality notification signal to be notified;
The second wireless communication unit wirelessly transmits the abnormality notification signal to the center server, receives the failure occurrence notification signal from the center server,
The second control unit notifies the second vehicle of a failure based on the failure occurrence notification signal,
The center server is
A communication unit for receiving the abnormality notification signal;
A database that stores an abnormality counter table that associates an in-vehicle device and a count value of an abnormality counter that counts the number of times an abnormality has occurred in the in-vehicle device;
Based on the abnormality notification signal received by the communication unit, the count value of the abnormal counter of the corresponding on-vehicle device in the abnormal counter table is increased, and the on-vehicle device whose count value of the abnormal counter is greater than or equal to a threshold value has failed. A third control unit for creating a failure occurrence notification signal to notify that
The communication unit is a communication system that transmits the failure occurrence notification signal. A center server capable of communication between the first in-vehicle device and the second in-vehicle device,
After the follow-up control is executed between the first vehicle on which the first vehicle-mounted device is mounted and the second vehicle on which the second vehicle-mounted device is mounted,
The center server is
An abnormality notification signal for notifying that an abnormality has occurred when there is a contradiction between the information related to the traveling state of the second vehicle and the information related to the traveling state of the first vehicle from the second vehicle-mounted device. A communication unit to receive,
A database that stores an abnormality counter table that associates an in-vehicle device and a count value of an abnormality counter that counts the number of times an abnormality has occurred in the in-vehicle device;
Based on the abnormality notification signal received by the communication unit, the count value of the abnormal counter of the corresponding on-vehicle device in the abnormal counter table is increased, and the on-vehicle device whose count value of the abnormal counter is greater than or equal to a threshold value has failed. And a controller for generating a failure occurrence notification signal to notify that
The communication unit is a center server that transmits the failure occurrence notification signal. A control method in a communication system comprising a first in-vehicle device and a second in-vehicle device,
After the follow-up control is executed between the first vehicle on which the first vehicle-mounted device is mounted and the second vehicle on which the second vehicle-mounted device is mounted,
The first in-vehicle device is:
Obtaining information on the running state of the first vehicle;
Wirelessly transmitting information on the running state of the first vehicle;
From the second in-vehicle device, an abnormality notification signal for notifying that an abnormality has occurred is received,
Based on the abnormality notification signal, the count value of a first abnormality counter that counts the number of times an abnormality has occurred is increased,
When the count value of the first abnormality counter is equal to or greater than a threshold value, the first vehicle is notified of a failure,
The second in-vehicle device is
Receiving information relating to the traveling state of the first vehicle from the first vehicle-mounted device;
Information is acquired on the running state of the second vehicle, and an abnormality has occurred when there is a contradiction between the information on the running state of the second vehicle and the information on the running state of the first vehicle. Create an abnormality notification signal to notify,
Wirelessly transmitting the abnormality notification signal to the first vehicle-mounted device,
Increase the count value of the second abnormality counter that counts the number of times an abnormality has occurred,
A communication method for stopping the follow-up control and notifying the second vehicle of a failure when the count value of the second abnormality counter is equal to or greater than a threshold value. A control method in an in-vehicle device,
After the follow-up control is executed between the first vehicle on which the other onboard device is mounted and the second vehicle on which the onboard device is mounted,
The in-vehicle device is
Receiving information on the running state of the first vehicle from the other vehicle-mounted device;
Information is acquired on the running state of the second vehicle, and an abnormality has occurred when there is a contradiction between the information on the running state of the second vehicle and the information on the running state of the first vehicle. Create an abnormality notification signal to notify,
Wirelessly transmitting the abnormality notification signal to the other in-vehicle device,
When the count value of an abnormality counter that counts the number of times that an abnormality has occurred is increased, and the count value of the abnormality counter is equal to or greater than a threshold value, the tracking control is stopped and a failure is detected in the second vehicle. Control method to notify. A control method in a communication system comprising a first in-vehicle device, a second in-vehicle device, and a center server,
After the follow-up control is executed between the first vehicle on which the first vehicle-mounted device is mounted and the second vehicle on which the second vehicle-mounted device is mounted,
The first in-vehicle device is:
Obtaining information on the running state of the first vehicle;
Wirelessly transmitting information on the running state of the first vehicle;
From the center server, a failure occurrence notification signal for notifying that a failure has occurred is received,
Based on the failure occurrence notification signal, notifying the first vehicle that there is a failure,
The second in-vehicle device is
Receiving information relating to the traveling state of the first vehicle from the first vehicle-mounted device;
Information is acquired on the running state of the second vehicle, and an abnormality has occurred when there is a contradiction between the information on the running state of the second vehicle and the information on the running state of the first vehicle. Create an abnormality notification signal to notify,
Wirelessly transmitting the abnormality notification signal to the center server;
Receiving the failure occurrence notification signal from the center server;
Based on the failure occurrence notification signal, notifying the second vehicle that there is a failure,
The center server is
Receiving the abnormality notification signal;
Based on the abnormality notification signal, the count value of the abnormality counter of the corresponding on-vehicle device in the abnormality counter table in which the on-vehicle device and the count value of the abnormality counter that counts the number of times the abnormality has occurred in the on-vehicle device is increased. ,
Create a failure occurrence notification signal for notifying the in-vehicle device that the count value of the abnormality counter is greater than or equal to the threshold,
A control method for transmitting the failure occurrence notification signal. A control method in a center server capable of communication between a first in-vehicle device and a second in-vehicle device,
After the follow-up control is executed between the first vehicle on which the first vehicle-mounted device is mounted and the second vehicle on which the second vehicle-mounted device is mounted,
The center server is
An abnormality notification signal for notifying that an abnormality has occurred when there is a contradiction between the information related to the traveling state of the second vehicle and the information related to the traveling state of the first vehicle from the second vehicle-mounted device. Receive
Based on the abnormality notification signal, the count value of the abnormality counter of the corresponding on-vehicle device in the abnormality counter table in which the on-vehicle device and the count value of the abnormality counter that counts the number of times the abnormality has occurred in the on-vehicle device is increased. ,
Create a failure occurrence notification signal for notifying the in-vehicle device that the count value of the abnormality counter is greater than or equal to the threshold,
A control method for transmitting the failure occurrence notification signal.

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