JP4925860B2 - In-vehicle communication system and in-vehicle communication method - Google Patents

Description

  The present invention relates to an in-vehicle communication system in which ECUs (Electronic Control Units) are divided into a plurality of groups and connected to an in-vehicle communication line for each group, and in particular, data transmitted from each ECU is recorded and also to each ECU. When a plurality of in-vehicle communication devices each having a database for transmitting data are provided for each group, and each in-vehicle communication device is connected via a communication line, each in-vehicle communication device has the same database. It is related with the vehicle-mounted communication system and vehicle-mounted communication method which can be made to synchronize with the content of.

  In recent years, the number and types of ECUs that electrically control mounted devices or driving assistance functions tend to increase with the increase in the number of devices mounted on automobiles and the increase in driving assistance functions.

  Accordingly, as the number of ECUs increases, the amount of data transmitted / received via an in-vehicle communication line to which the ECUs are connected also increases. An increase in the amount of data transmitted and received through the in-vehicle communication line causes data delay or loss due to collision (collision). A significant delay or loss of data may be fatal to driving assistance functions such as brake control by the ECU.

  Therefore, a configuration in which the ECUs are divided into a plurality of groups and the ECUs are connected to different in-vehicle communication lines for each group is common. Further, in order to efficiently use the in-vehicle communication line against the increase in the ECU, there is a configuration in which the ECU group is classified according to the type of data transmitted and received and connected to the in-vehicle communication line having a different communication speed for each group. In these configurations, different in-vehicle communication lines are connected by a gateway device that controls transmission and reception of data.

In Patent Document 1, the ECU is divided into a plurality of groups and connected to the in-vehicle communication line for each group, and the in-vehicle communication line is further connected by a gateway device, and the priority for identifying the priority order for the transmitted and received data When the gateway device transmits / receives data between different in-vehicle communication lines, the priority is determined from the received data priority information and data with higher priority is transmitted preferentially. A technique is disclosed in which transmission of data with high priority is not greatly delayed even when the communication load increases.
JP 2005-159568 A

  When the ECUs are divided into a plurality of groups and the ECUs are connected via the gateway device, the content of the data updated by the ECUs in one group is updated after the other group via the gateway device. There is a time during which data contents do not match between one group and the other group before being transmitted to the ECU. Furthermore, when a plurality of groups are connected in series to the gateway device, there is a possibility that a time difference may occur in a stepwise manner in data contents between one group and another group.

  In other words, the data used by each ECU is consistent by dividing each ECU into a plurality of groups in order to reduce the communication load even though the data of the same contents should originally be usable by each ECU. Could be lost.

  The present invention has been made in view of such circumstances, and has a database for collecting and recording data transmitted from each in-vehicle device such as an ECU divided into a plurality of groups. Each group has a vehicle-mounted communication device that connects to a communication line different from the connected in-vehicle communication line in a bus type, and one vehicle-mounted communication device of each vehicle-mounted communication device transmits from another vehicle-mounted communication device The collected data is aggregated in a database owned by itself, and the contents of the aggregated database are transmitted to other in-vehicle communication devices, so that each in-vehicle communication device has its own database synchronized with the same content, It is an object of the present invention to provide an in-vehicle communication system and an in-vehicle communication method that can make the contents of data acquired from the in-vehicle communication device consistent for each group.

  Another object of the present invention is that each in-vehicle communication device transmits a whole database that it has, and receives and updates a newly generated database from one in-vehicle communication device, thereby simplifying the configuration. Therefore, it is an object of the present invention to provide an in-vehicle communication system that can synchronize a database included in each in-vehicle communication device with the same content.

  Another object of the present invention is to provide a configuration in which each in-vehicle communication device transmits only predetermined data in its own database, so that the in-vehicle communication device suppresses the communication load of the communication line connecting between the in-vehicle communication devices. It is an object of the present invention to provide an in-vehicle communication system that can synchronize the respective databases with the same contents.

  Another object of the present invention is to provide a configuration in which each in-vehicle communication device transmits only updated data in its own database, thereby suppressing the communication load of communication lines connecting between the in-vehicle communication devices. It is an object of the present invention to provide an in-vehicle communication system that can synchronize a database included in each device with the same content.

  Another object of the present invention is to generate a new database by storing, for each in-vehicle communication device, which in-vehicle communication device updates each data in the database. In this case, it is to provide an in-vehicle communication system that can determine which in-vehicle communication device should be used for each data and synchronize a database with the same and latest contents.

  Another object of the present invention is to generate a new database by one in-vehicle communication device by transmitting information that can identify which data in the database is the data transmitted by each in-vehicle communication device. It is an object of the present invention to provide an in-vehicle communication system capable of determining which data from which in-vehicle communication device should be used for each data and synchronizing a database with the latest contents.

  Another object of the present invention is that one in-vehicle communication device generates a new database by transmitting information that allows each in-vehicle communication device to specify which data in the database has been updated. It is an object of the present invention to provide an in-vehicle communication system that can determine which data of which in-vehicle communication device should be used for each data and synchronize a database with the latest contents. .

  Another object of the present invention is to set whether to transmit all data, only predetermined data, or only updated data, for each in-vehicle communication device other than one in-vehicle communication device. To provide an in-vehicle communication system that can efficiently transmit data according to attributes such as the amount and type of data to be updated in the database and synchronize the database with the same and latest contents. It is in.

  Another object of the present invention is to provide a communication load for communication lines between in-vehicle communication lines by starting transmission of data in accordance with a start instruction transmitted by any one of the in-vehicle communication apparatuses. It is providing the vehicle-mounted communication system which can reduce a database and can synchronize a database with the same content.

  Another object of the present invention is that an in-vehicle communication device other than one in-vehicle communication device transmits data from a database that the in-vehicle communication device has according to a predetermined transmission priority. It is an object of the present invention to provide an in-vehicle communication system capable of avoiding data collision and efficiently synchronizing a database with the same contents.

  Another object of the present invention is to prevent data collisions in communication lines between in-vehicle communication devices by transmitting data from the database that the in-vehicle communication devices other than one in-vehicle communication device has in accordance with a predetermined order. An object is to provide an in-vehicle communication system that can avoid and efficiently synchronize a database with the same contents.

  Another object of the present invention is to detect data collisions in communication lines between in-vehicle communication devices by transmitting data from a database owned by the in-vehicle communication device other than the one in-vehicle communication device at a predetermined time. An object is to provide an in-vehicle communication system that can avoid and efficiently synchronize a database with the same contents.

  Another object of the present invention is to communicate between in-vehicle communication devices by transmitting data from a database owned by the in-vehicle communication device other than the one in-vehicle communication device in a transmission period determined by time division. It is an object of the present invention to provide an in-vehicle communication system capable of efficiently synchronizing a database with the same contents while avoiding data collision on a line.

  An in-vehicle communication system according to a first aspect of the present invention is an in-vehicle communication system including a plurality of in-vehicle devices that transmit and receive data and an in-vehicle communication line that connects the in-vehicle devices divided into a plurality of groups for each group. Connected to the in-vehicle communication line, having a database for recording data transmitted / received via each in-vehicle device and the in-vehicle communication line, and connected in a bus type to a communication line different from the in-vehicle communication line Each vehicle-mounted communication device is provided for each group, each vehicle-mounted communication device includes means for transmitting data in its own database to another vehicle-mounted communication device via the communication line, and the plurality of vehicle-mounted communication devices. One in-vehicle communication device of the apparatus includes means for receiving data transmitted from the other in-vehicle communication device via the communication line, and data transmitted from the other in-vehicle communication device via the communication line. And / or a generation unit that newly generates a database based on a database that the device has, and a unit that transmits the generated database to the other in-vehicle communication device via the communication line. The apparatus is characterized in that its own database is updated to the database transmitted from the one in-vehicle communication apparatus.

  The in-vehicle communication system according to the second invention is characterized in that the other in-vehicle communication device transmits all data in a database included in the other in-vehicle communication device via the communication line.

  In the in-vehicle communication system according to the third aspect of the invention, predetermined data in the database is set for each in-vehicle communication device in each in-vehicle communication device, and the other in-vehicle communication device is included in the database of its own. Only the predetermined data is transmitted to the one in-vehicle communication device via the communication line.

  In the in-vehicle communication system according to the fourth aspect of the present invention, the other in-vehicle communication device transmits only updated data in a database owned by the other in-vehicle communication device to the one in-vehicle communication device via the communication line. It is characterized by that.

  In the in-vehicle communication system according to a fifth aspect of the present invention, the one in-vehicle communication device includes means for storing predetermined data in a database set for each in-vehicle communication device, and is transmitted from the other in-vehicle communication device. A means for reading out the predetermined data set in the other in-vehicle communication device from the read data and / or the database included in the data, and the generating means includes the read data Are respectively generated as the predetermined data in a new database.

  The in-vehicle communication system according to a sixth aspect of the present invention is characterized in that the other in-vehicle communication device includes means for transmitting specific information for specifying which data in the database is to be transmitted, and the generating means The data transmitted from the other in-vehicle communication device is generated as data specified by the specific information in a new database.

  In the in-vehicle communication system according to a seventh aspect of the present invention, the other in-vehicle communication device uses the specific information for specifying which data in the database is the updated data in the database that the other in-vehicle communication device has. Means for transmitting to one in-vehicle communication device, wherein the one in-vehicle communication device comprises means for reading out data specified by the transmitted specific information from data transmitted from another in-vehicle communication device, The generation means generates the read data as the specified data in a new database.

  In the in-vehicle communication system according to the eighth aspect of the present invention, one of the other in-vehicle communication devices is configured to transmit all data in a database that the other in-vehicle communication device has, and the other in-vehicle communication device has the one in itself. Only the predetermined data set in the database is transmitted, and one of the other in-vehicle communication devices has only the updated data in its own database and the data to be transmitted is stored in the database. Specific information for specifying which data is included in the data, and the one in-vehicle communication device transmits all data, only predetermined data for each of the other in-vehicle communication devices. Means for storing either transmission or transmission of updated data only, and predetermined data in a database set for each in-vehicle communication device are stored. And according to the transmission of all data, the means for reading the predetermined data set in the other in-vehicle communication device from the data transmitted from the other in-vehicle communication device stored, and the transmission of only the predetermined data Means for reading out data transmitted from other stored in-vehicle communication devices as predetermined data set in the in-vehicle communication device, and other in-vehicle communication devices stored according to transmission of only updated data Means for reading out the data transmitted as the data specified by the transmitted specific information, and the generating means reads the read data into the predetermined data in the new database or the specified data. It is characterized by being generated as data.

  In the in-vehicle communication system according to the ninth aspect, any one of the in-vehicle communication devices includes means for transmitting an instruction to start transmission, and the other in-vehicle communication device transmits data when the instruction is received. It is characterized by the above.

  In the in-vehicle communication system according to the tenth aspect of the present invention, priority is set for each of the other in-vehicle communication devices, and the other in-vehicle communication device transmits data in the order according to the set priority. It is characterized by being.

  In the in-vehicle communication system according to the eleventh aspect of the invention, a transmission order is set in the other in-vehicle communication device, and the other in-vehicle communication device transmits data according to the set transmission order. Features.

  In the in-vehicle communication system according to the twelfth aspect, each in-vehicle communication device has a transmission time set, and the other in-vehicle communication device transmits data at the set transmission time. It is characterized by.

  In the in-vehicle communication system according to the thirteenth aspect, each in-vehicle communication device has a time-division transmission period set, and the other in-vehicle communication device transmits data in the set transmission period. It is characterized by being.

  An in-vehicle communication method according to a fourteenth invention uses an in-vehicle communication system including a plurality of in-vehicle devices that transmit and receive data and an in-vehicle communication line that divides each in-vehicle device into a plurality of groups and connects each group. In the in-vehicle communication method for transmitting data transmitted from the in-vehicle device included in the group to the in-vehicle device included in the other group, the bus communication type is connected to the communication line different from the in-vehicle communication line to the in-vehicle communication system. And a plurality of in-vehicle communication devices each having a database that records data transmitted from each in-vehicle device connected to the in-vehicle communication line for each group. The other in-vehicle communication device other than the one in-vehicle communication device transmits data in the database that it has to the one in-vehicle communication device via the communication line, and the one in-vehicle communication device other Receives data transmitted from the in-vehicle communication device via the communication line, generates a new database based on the received data and a database included in the received data, and transmits the generated database to the other in-vehicle communication device. And the other in-vehicle communication device receives the database transmitted from the one in-vehicle communication device via the communication line, and updates the database it has to the received database. To do.

  In the first invention and the fourteenth invention, an in-vehicle communication system having a configuration in which on-vehicle devices that transmit and receive data are divided into a plurality of groups and connected to the in-vehicle communication line for each group are connected to the in-vehicle communication line for each group. Further, an in-vehicle communication device having a database for recording data transmitted from each in-vehicle device is further included. Each in-vehicle communication device is connected in a bus type via a communication line different from the in-vehicle communication line connecting between the in-vehicle devices and between the in-vehicle device and the in-vehicle communication device. From each in-vehicle communication device, data is transmitted through a communication line from the database of each in-vehicle communication device. A new database is generated by one in-vehicle communication device of each in-vehicle communication device based on data transmitted from the other in-vehicle communication device via the communication line and / or data read from the database that the device has, The generated database is transmitted to another in-vehicle communication device via the communication line. Since each in-vehicle communication device is connected to the communication line in a bus shape, new databases transmitted from one in-vehicle communication device are simultaneously received and updated by other in-vehicle communication devices.

  In the 2nd invention, the whole database which self has from other in-vehicle communication equipment is transmitted.

  In the third aspect of the invention, only predetermined data set in a database owned by itself is transmitted from another in-vehicle communication device.

  In the 4th invention, only the updated data in the database which self has from other in-vehicle communication equipment is transmitted.

  In the fifth aspect of the present invention, one in-vehicle communication device that stores predetermined data set for each in-vehicle communication device, from all data transmitted from other in-vehicle communication devices or data of only predetermined data, Predetermined data set for each in-vehicle communication device is read. The set predetermined data is read out from the database of one in-vehicle communication device. The read data is determined and recorded as predetermined data in a newly generated database.

  In the sixth invention, not only data from the database but also specific information for specifying which data in the database is transmitted from other in-vehicle communication devices. Therefore, in one in-vehicle communication device, all data transmitted from other in-vehicle communication devices, data of only predetermined data, or data of only updated data are recorded as data in a new database. Is identified and a new database is generated.

  In the seventh invention, not only data from the database but also specific information for specifying which data in the database is the updated data is transmitted from the other in-vehicle communication device. Therefore, in one in-vehicle communication device, data specified by specific information is read from all data transmitted from another in-vehicle communication device or only predetermined data, and any data in the new database is read out. Is recorded. In addition, when only updated data is transmitted from another in-vehicle communication device, it is specified which data in the new database is to be recorded, and a new database is generated. .

  In the eighth aspect of the invention, whether to transmit all data for each other in-vehicle communication device, to transmit only predetermined data, or to transmit only updated data, receives data from other in-vehicle communication devices. Set to the in-vehicle communication device. In addition, in one in-vehicle communication device, predetermined data in the database is set for each in-vehicle communication device. When all data is transmitted by one in-vehicle communication device, the predetermined data set from the data received from the set in-vehicle communication device is read and recorded as predetermined data in a new database. Data received from the in-vehicle communication device that is set to transmit only predetermined data is recorded as predetermined data that is set in a new database. Since the in-vehicle communication device that is set to transmit only updated data is transmitted with specific information for identifying which data in the database is transmitted, the new data in the new database It is recorded as data specified by the specific information.

  In the ninth aspect of the invention, data read from the database included in the other in-vehicle communication device is transmitted with the reception of the transmission start instruction transmitted from any one of the in-vehicle communication devices as a trigger.

  In the tenth aspect of the invention, data is transmitted in accordance with the set priority from another in-vehicle communication device that transmits data recorded in the database to one in-vehicle communication device.

  In the eleventh aspect of the invention, data is transmitted from the other in-vehicle communication devices that transmit data recorded in the database to one in-vehicle communication device according to the transmission order set for each.

  In the twelfth aspect, data is transmitted from each other in-vehicle communication device that transmits data recorded in the database to one in-vehicle communication device at the transmission time set for each.

  In the thirteenth invention, data is transmitted from another in-vehicle communication device that transmits data recorded in the database to one in-vehicle communication device in a transmission period that is set to be time-divided and assigned to each in-vehicle communication device. The

  In the case of the first invention and the fourteenth invention, in the in-vehicle communication system, the data in the database connects each in-vehicle communication device from the in-vehicle communication device having a database that records the data transmitted from each in-vehicle device such as an ECU. Transmitted through the communication line, and one in-vehicle communication device aggregates data transmitted from other in-vehicle communication devices and transmits a new database. Since it is connected to the bus type, a new database transmitted from one in-vehicle communication device can be received at the same time, so the time taken for the contents of the database in each in-vehicle communication device to be synchronized with the same content It is possible to ensure that there is some data, and it is possible to make the contents of the data acquired from the in-vehicle communication device consistent by the in-vehicle devices connected to different groups.

  In the case of the second invention, other in-vehicle communication devices other than the one in-vehicle communication device are newly generated and transmitted by a simple configuration that transmits all data without selecting data from the database of the in-vehicle communication device. The database can be acquired almost simultaneously with other in-vehicle communication devices. Therefore, it is possible to synchronize the contents of the database of each in-vehicle communication device with the same contents with a simple configuration.

  In the case of the third invention, since the other in-vehicle communication devices other than the one in-vehicle communication device transmit only the set predetermined data, the amount of data transmitted to the communication line connecting the in-vehicle communication devices is reduced. The Therefore, the content of the database which each vehicle-mounted communication apparatus has can be synchronized with the same content, suppressing the communication load of the communication line which connects between vehicle-mounted communication apparatuses.

  In the case of the fourth invention, since the other in-vehicle communication devices other than the one in-vehicle communication device transmit only the updated data, the amount of data transmitted to the communication line connecting the in-vehicle communication devices is reduced. Therefore, the content of the database which each vehicle-mounted communication apparatus has can be synchronized with the same content, suppressing the communication load of the communication line which connects between vehicle-mounted communication apparatuses.

  In the case of the fifth aspect of the invention, by setting as predetermined data which data in the database is to be updated for each in-vehicle communication device, it is transmitted from the in-vehicle communication device that updates the data as each predetermined data. Since a new database is generated using the generated data, the generated database has the latest contents. Therefore, the database can be synchronized with the same and latest contents.

  In the case of the sixth invention, even when all data is transmitted from another in-vehicle communication device, when predetermined data is transmitted, or when only updated data is transmitted. Even if there is, it is possible to specify which data in the database the transmitted data is, so for each data, it is determined which in-vehicle communication device the data transmitted from should be used. It can be synchronized to the same content.

  In the case of the seventh invention, even when all data is transmitted from another in-vehicle communication device, when predetermined data is transmitted, or when only updated data is transmitted Even if there is, it is possible to identify the updated data from the transmitted data and identify which data in the database, so that the database is the same using the most appropriate data as the latest data Can be synchronized with the content.

  In the case of the eighth invention, it is possible to set how to transmit data for each in-vehicle communication device. Therefore, each in-vehicle communication device transmits all data when the amount of data to be updated is large in the database, and sets only the type when the type of data to be updated is only a part. The data can be efficiently transmitted according to the attribute of the data to be updated, such as by transmitting the data, and the database can be synchronized with the same and latest contents.

  In the case of the ninth invention, data is transmitted in response to a transmission start instruction from any one of the in-vehicle communication devices. Conversely, data is not transmitted until a transmission start instruction is received. The database can be synchronized with the same contents by reducing the load on the communication line connecting the.

  In the case of the tenth invention, each of the other in-vehicle communication devices that transmit the data recorded in the database to one in-vehicle communication device transmits the data after the data is transmitted from the in-vehicle communication device having a higher priority than itself. . Therefore, data collision from each in-vehicle communication device is avoided, and the database can be efficiently synchronized with the same content.

  In the case of the eleventh invention, the other in-vehicle communication devices that transmit the data recorded in the database to one in-vehicle communication device transmit the data according to the set transmission order. It is avoided and the database can be efficiently synchronized with the same contents.

  In the case of the twelfth invention, the other in-vehicle communication device that transmits the data recorded in the database to one in-vehicle communication device transmits the data at the set transmission time. Data collision from each in-vehicle communication device is avoided. Therefore, data collision can be avoided and the database can be efficiently synchronized with the same contents.

  In the case of the thirteenth invention, data is transmitted during the transmission period set for each in-vehicle communication device. Since the transmission period set for each in-vehicle communication device is set to a time-division period so as to be assigned to each in-vehicle communication device, each in-vehicle communication device transmits data in the assigned transmission period, that is, each Data transmitted from the in-vehicle communication device does not collide. Therefore, data collision can be avoided and the database can be efficiently synchronized with the same contents.

  Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.

(Embodiment 1)
FIG. 1 is a configuration diagram showing a configuration of an in-vehicle communication system according to the present invention. The in-vehicle communication system includes ECUs (Electronic Control Units) 4a, 4a, ..., 4b, 4b, ..., 4c, 4c, ..., 4d, 4d, ... that are in-vehicle devices divided into a plurality of groups. , 4c, 4c,..., 4d, 4d,..., 4d, 4d,..., And in-vehicle communication lines 3a, 3b, 3c. , 3d connected to each of the in-vehicle communication devices 1a, 1b, 1c, 1d and the communication line 2 connecting each of the in-vehicle communication devices 1a, 1b, 1c, 1d as a main line, Is configured.

  Each on-vehicle communication device 1a, 1b, 1c, 1d is connected to the communication line 2 in a bus form. On the other hand, each of the ECUs 4a, 4a, ..., 4b, 4b, ..., 4c, 4c, ..., 4d, 4d, ... and the in-vehicle communication devices 1a, 1b, 1c, 1d have their in-vehicle communication lines 3a, 3b, Although connected to 3c and 3d, the connection form (topology) may be any form such as a bus type, a star type, or a daisy chain type.

  Each of the in-vehicle communication devices 1a, 1b, 1c, 1d is a communication device provided with a recording area used as the databases 11a, 11b, 11c, 11d. The in-vehicle communication device 1a records data transmitted from the ECUs 4a, 4a... Connected to the in-vehicle communication line 3a in the database 11a, and transmits the data read from the database 11a to the ECUs 4a, 4a.

  The communication line 2 is, for example, a coaxial cable that connects the in-vehicle communication devices 1a, 1b, 1c, and 1d in a bus shape. The in-vehicle communication lines 3a, 3b, 3c, 3d connect the ECUs 4a, 4a, ..., 4b, 4b, ..., 4c, 4c, ..., 4d, 4d, ... and the in-vehicle communication devices 1a, 1b, 1c, 1d. And a cable suitable for the connection form is used.

  The ECUs 4a, 4a, ..., 4b, 4b, ..., 4c, 4c, ..., 4d, 4d, ... transmit data including numerical information of various physical quantities such as measured values, calculated values, control values, or engines, brakes, etc. This is a device that can be controlled by a microcomputer. For example, one ECU 4a functions as an ABS (Antilock Break System) and is connected to a sensor (not shown) that detects the rotational speed (wheel speed) of the wheel. One ECU 4a controls the brake based on the wheel speed detected via the sensor during braking of the vehicle, and transmits data including the measured value of the wheel speed to the other ECUs 4a,.

  Here, when the wheel speed data transmitted from the ECU 4a is also used in each of the ECUs 4b, 4b, ..., 4c, 4c, ..., 4d, 4d, ... connected to the other in-vehicle communication lines 3b, 3c, 3d. The in-vehicle communication device 1a records the wheel speed data in the databases 11b, 11c, and 11d of the other in-vehicle communication devices 1b, 1c, and 1d, and the in-vehicle communication devices 1b, 1c, and 1d are connected to the ECUs 4b, 4b,. 4c, 4c,..., 4d, 4d,. Therefore, every time each in-vehicle communication device 1a, 1b, 1c, 1d receives data transmitted from each ECU 4a, 4a, ..., 4b, 4b, ..., 4c, 4c, ..., 4d, 4d, ... This can be realized by transmitting to the in-vehicle communication devices 1a, 1b, 1c, and 1d, receiving the respective in-vehicle communication devices 1a, 1b, 1c, and 1d and recording them in the respective databases 11a, 11b, 11c, and 11d. it can.

  By the way, it is desirable that the data simultaneously received by the ECUs 4a, 4b, 4c, 4d divided into different groups among the data recorded in the databases 11a, 11b, 11c, 11d have the same contents. is there. The problem is that the contents of the respective databases 11a, 11b, 11c, and 11d are not synchronized with the same contents. For example, there may be a problem that the speed value included in the wheel speed data recorded in the database 11a is different from the speed value included in the wheel speed data recorded in the database 11b.

  In this case, each time the above-described in-vehicle communication devices 1a, 1b, 1c, and 1d receive data from the respective ECUs 4a, 4a, ..., 4b, 4b, ..., 4c, 4c, ..., 4d, 4d, ... When data is transmitted to the in-vehicle communication devices 1a, 1b, 1c, 1d and recorded in the respective databases 11a, 11b, 11c, 11d, one data is transmitted to the other in-vehicle communication devices 1a, 1b, 1c, 1d. Then, considering the one data at the moment recorded in the databases 11a, 11b, 11c, and 11d, the contents of the data, that is, the specific measured values, calculated values, and control values are the respective in-vehicle communication devices 1a, 1b, It is the same in the databases 11a, 11b, 11c, and 11d of 1c and 1d. However, since various data are recorded in each of the databases 11a, 11b, 11c, and 11d, exchange by transmission / reception between the in-vehicle communication devices 1a, 1b, 1c, and 1d via the communication line 2 is performed for all the data. Until completion, the databases 11a, 11b, 11c, and 11d are synchronized with the same contents, and it is not guaranteed that any data in the databases 11a, 11b, 11c, and 11d has the same contents.

  Therefore, in the in-vehicle communication system according to the present invention, one in-vehicle communication device 1a aggregates the databases 11a, 11b, 11c, and 11d included in each in-vehicle communication device 1a, 1b, 1c, and 1d, It transmits so that it may distribute to vehicle-mounted communication apparatus 1b, 1c, 1d. FIG. 2 is a schematic diagram conceptually showing a configuration for collecting and distributing databases among the in-vehicle communication devices 1a, 1b, 1c, and 1d of the in-vehicle communication system according to the present invention. FIG. 2 (a) represents the flow in which the databases 11a, 11b, 11c, and 11d are aggregated from each in-vehicle communication device 1b, 1c, and 1d to one in-vehicle communication device 1a with white arrows. The dashed cylindrical shape represents the newly aggregated database. The in-vehicle communication devices 1b, 1c, and 1d transmit their own databases 11b, 11c, and 11d to one in-vehicle communication device 1a, and the one in-vehicle communication device 1a together with the own database 11a has another in-vehicle communication device 1b. , 1c, 1d, the databases 11b, 11c, 11d are collected.

  FIG. 2B shows the flow of transmission so that the newly aggregated database is distributed to the in-vehicle communication devices 1b, 1c, and 1d by white arrows. One in-vehicle communication device 1a transmits the aggregated database to the communication line 2 to transmit to the other in-vehicle communication devices 1a, 1b, 1c, and 1d. Since the in-vehicle communication devices 1a, 1b, 1c, and 1d are connected to the communication line 2 in a bus form, the transmitted database is received almost simultaneously by the in-vehicle communication devices 1a, 1b, 1c, and 1d, and the database 11b each has , 11c, 11d.

  In the in-vehicle communication system according to the present invention, as shown in FIG. 2, the transmission of data in the databases 11b, 11c, 11d by the in-vehicle communication devices 1a, 1b, 1c, 1d, and the aggregation by one in-vehicle communication device 1a. The database is periodically transmitted to the other in-vehicle communication devices 1b, 1c, and 1d. Thereby, in the vehicle-mounted communication system of this invention, it ensures that there exists time when the content of each database 11a, 11b, 11c, 11d is synchronized equally. Each process will be specifically described below.

  FIG. 3 is a block diagram showing an internal configuration of the in-vehicle communication devices 1a, 1b, 1c, and 1d according to the present invention. The in-vehicle communication device 1a is connected to a control unit 10a that controls the operation of each component shown below, a power supply circuit 12a that supplies power to each component, a storage unit 13a including a memory, and an in-vehicle communication line 3a. The first communication control unit 14a and the second communication control unit 15a connected to the communication line 2 are provided. The other in-vehicle communication devices 1b, 1c, and 1d have the same internal configuration as the in-vehicle communication device 1a, and thus detailed description thereof is omitted.

  The control unit 10a receives power supply from a vehicle alternator, a battery, or the like (not shown) via the power supply circuit 12a, reads and executes a control program stored in the storage unit 13a, and controls each component unit.

  The storage unit 13a is provided with a recording area for the database 11a in which data received by the control unit 10a from the ECUs 4a, 4a,. The controller 10a reads the corresponding specific measured value, calculated value, and control value from the received data for each attribute such as “wheel speed” and records it in the database 11a. In the embodiment described below, the structures of the databases 11a, 11b, 11c, and 11d are determined. That is, an area (address) in the databases 11a, 11b, 11c, and 11d is set for each data. For example, the data recorded at the address 1 in the database 11a is “wheel speed”. The data recorded at address 3 in the address can be specified as “oil temperature”.

  However, the present invention is not limited to this, and the database 11a may have a configuration in which identification information of data attributes such as attribute names and specific values associated with the identification information are recorded in pairs.

  In addition, data transmitted from each ECU 4a, 4a,... Is stored as predetermined data in the storage unit 13a. The in-vehicle communication device 1a receives data from each of the ECUs 4a, 4a,... Connected via the in-vehicle communication line 3a and records the data in the database 11a, and predetermined data that may be updated. Is set for each of the vehicle-mounted communication devices 1a, 1b, 1c, and 1d, and the storage unit 13a stores which data in the database 11a the predetermined data is. For example, when the ECU 4a connected to the sensor for detecting the “wheel speed” is connected to the in-vehicle communication device 1a, the “wheel speed” data is stored in the in-vehicle communication device 1a in the storage unit 13a of the in-vehicle communication device 1a. It is stored as predetermined data that has been set. Specifically, the storage unit 13a stores an area in the database 11a in which predetermined data is recorded or an attribute name of the predetermined data.

  The data stored as the predetermined data in the storage unit 13a is data that is received or updated from the connected ECUs 4a, 4a,. However, the present invention is not limited to this, and when the in-vehicle communication device 1a performs control or calculation processing, the data updated as a result of the control or calculation performed by itself may be stored as predetermined data.

  The first communication control unit 14a implements data transmission / reception with the ECUs 4a, 4a,... Connected via the in-vehicle communication line 3a. The control unit 10a receives data from each of the ECUs 4a, 4a,... By the first communication control unit 14a, and transmits the data.

  Further, the second communication control unit 15a realizes data transmission / reception with other in-vehicle communication devices 1b, 1c, and 1d connected in a bus form via the communication line 2. The control unit 10a transmits the data read from the database 11a by the second communication control unit 15a, and receives the data transmitted from the other in-vehicle communication devices 1b, 1c, 1d.

  In the in-vehicle communication system of the present invention configured as described above, processing for synchronizing the databases 11a, 11b, 11c, and 11d of the in-vehicle communication devices 1a, 1b, 1c, and 1d with the same contents will be described below.

  Note that the hardware configurations of the in-vehicle communication devices 1a, 1b, 1c, and 1d are the same as described above. However, the processing procedure is different between one in-vehicle communication device 1a among the in-vehicle communication devices 1a, 1b, 1c, and 1d and the other in-vehicle communication devices 1b, 1c, and 1d. One in-vehicle communication device 1a operates as a master that aggregates data transmitted from other in-vehicle communication devices 1b, 1c, and 1d and generates a new database. Therefore, one in-vehicle communication device 1a and other in-vehicle communication devices 1b, 1c, and 1d are distinguished, and each processing procedure will be described below.

  The in-vehicle communication device 1a sends an instruction signal for instructing the other in-vehicle communication devices 1b, 1c, and 1d to transmit data from the databases 11b, 11c, and 11d to the communication line 2 by the second communication control unit 15a. The in-vehicle communication device 1a receives the databases 11b, 11c, and 11d transmitted from the other in-vehicle communication devices 1b, 1c, and 1d in response to the instruction signal, and uses the received databases 11b, 11c, and 11d to create a new one. A database is generated and transmitted to the other in-vehicle communication devices 1b, 1c, 1d. The in-vehicle communication device 1a transmits an instruction signal, for example, every 10 milliseconds, and repeats generation of a new database and transmission to other in-vehicle communication devices 1b, 1c, and 1d.

  Accordingly, the storage unit 13a of the in-vehicle communication device 1a stores not only predetermined data set for itself but also predetermined data set for the other in-vehicle communication devices 1b, 1c, and 1d. As a result, it is possible to determine which data should be read from each of the databases 11b, 11c, and 11d transmitted from the in-vehicle communication devices 1b, 1c, and 1d and adopted as a new database.

  FIG. 4 is a flowchart illustrating an example of a processing procedure in which the control unit 10a of the in-vehicle communication device 1a according to the first embodiment receives data from the other in-vehicle communication devices 1b, 1c, and 1d and generates a new database.

  The control unit 10a of the in-vehicle communication device 1a that operates as a master transmits a signal that instructs the other in-vehicle communication devices 1b, 1c, and 1d to start transmission of the databases 11a, 11b, 11c, and 11d by the second communication control unit 15a. (Step S11). The control unit 10a of the in-vehicle communication device 1a determines whether data is transmitted from the other in-vehicle communication devices 1b, 1c, 1d via the communication line 2 (step S12). If the control unit 10a of the in-vehicle communication device 1a determines that data is not transmitted (S12: NO), the process returns to step S12 and waits until it is determined that data is transmitted. Since the in-vehicle communication devices 1a, 1b, 1c, and 1d are connected to the communication line 2 in a bus form, when data is transmitted from any of the other in-vehicle communication devices 1a, 1b, 1c, and 1d, Can be detected.

  When the control unit 10a of the in-vehicle communication device 1a determines that data is transmitted from the other in-vehicle communication devices 1b, 1c, and 1d (S12: YES), it receives the transmitted data and stores it in the storage unit 13a. Temporarily store (step S13).

  Next, the control unit 10a of the in-vehicle communication device 1a determines whether data has been received from all the other in-vehicle communication devices 1b, 1c, and 1d (step S14). When the control unit 10a of the in-vehicle communication device 1a determines that data has not been received from all the other in-vehicle communication devices 1b, 1c, 1d (S14: NO), the process returns to step S12 to return to the other in-vehicle communication device. The process of receiving data from 1b, 1c, 1d is continued.

  When the control unit 10a of the in-vehicle communication device 1a determines that data has been received from all the other in-vehicle communication devices 1b, 1c, 1d (S14: YES), the data temporarily stored in the storage unit 13a is used. Then, a new database is generated (step S15). Details of generation of a new database by the control unit 10a in step S15 will be described later.

  The control unit 10a of the in-vehicle communication device 1a updates the database 11a in the storage unit 13a to the new database generated in step S15 (step S16), and is generated in step S15 to the other in-vehicle communication devices 1b, 1c, 1d. The new database is transmitted (step S17), and the process is terminated.

  In the example shown in the flowchart of FIG. 4, the control unit 10a of the in-vehicle communication device 1a generates a new database separately from the database 11a of the storage unit 13a, and updates the database 11a of the storage unit 13a to the new database. . The present invention is not limited to this, and the database 11a in the storage unit 13a is newly generated, and the contents of a predetermined area in the database 11a are changed to data received from other in-vehicle communication devices 1b, 1c, 1d. The structure to do may be sufficient.

  FIG. 5 illustrates an example of a processing procedure in which the control unit 10b of the in-vehicle communication device 1b according to the first embodiment reads and transmits data from the database 11b, receives a newly generated database, and synchronizes with the same content. It is a flowchart to show. Since the processing procedures of the control units 10c and 10d of the other in-vehicle communication devices 1c and 1d are the same as the processing procedures of the control unit 10b of the in-vehicle communication device 1b, detailed description thereof is omitted.

  The control unit 10b of the in-vehicle communication device 1b determines whether a signal instructing the start of transmission from the in-vehicle communication device 1a operating as a master has been received (step S21). When the control unit 10b of the in-vehicle communication device 1b determines that the signal for instructing the start of transmission is not received (S21: NO), the control unit 10b returns the process to step S21 and determines that the signal for instructing the start of transmission has been received. Wait until.

  When the control unit 10b of the in-vehicle communication device 1b determines that the signal instructing the start of transmission has been received (S21: YES), the entire database 11b is read from the storage unit 13b (step S22).

  The control unit 10b of the in-vehicle communication device 1b determines whether or not the transmission right arbitration has been won depending on whether or not the transmission priority of its own data is higher than the other in-vehicle communication devices 1c and 1d (step S23). ). In step S23, it is determined whether or not the priority of transmission of its own data is higher than that of the other in-vehicle communication devices 1c and 1d, as in arbitration in a CAN (Control Area Network) that is a typical example of the in-vehicle LAN. The determination may be made by adding a signal for determining the priority before the data to be transmitted and attempting transmission, and determining whether or not the data transmitted by itself is actually transmitted to the communication line 2. A signal indicating the priority may be transmitted first, and it may be determined whether or not its own priority is higher than the priority expressed by the signal transmitted from another in-vehicle communication device.

  When the control unit 10b of the in-vehicle communication device 1b determines that the transmission priority is lower than the other in-vehicle communication devices 1c and 1d and has lost the arbitration (S23: NO), the control unit 10b from the other in-vehicle communication devices 1c and 1d The process waits until the transmission is completed (step S24). The process returns to step S23, and the processes of step S23 and step S24 are continued until it is determined that the transmission right arbitration has been won. Since each of the in-vehicle communication devices 1a, 1b, 1c, and 1d is connected to the communication line 2 in a bus form, it is determined whether data transmission from the other in-vehicle communication devices 1a, 1b, 1c, and 1d has been completed. Can be determined.

  When the control unit 10b of the in-vehicle communication device 1b determines that the transmission priority is higher than the other in-vehicle communication devices 1c and 1d and the arbitration of the transmission right is won (S23: YES), the control unit 10b reads out in step S22. The entire database 11b is transmitted as data to one in-vehicle communication device 1a via the communication line 2 (step S25).

  Next, the controller 10b of the in-vehicle communication device 1b determines whether or not a newly generated database is transmitted from the in-vehicle communication device 1a (step S26). The control unit 10b of the in-vehicle communication device 1b determines that the database is transmitted if any transmission is performed from the in-vehicle communication device 1a after transmitting the data in step S25. When a newly generated database is transmitted from the in-vehicle communication device 1a, a new database is transmitted by transmitting a signal indicating that the new database is transmitted before transmission. It can also be determined whether or not.

  When the controller 10b of the in-vehicle communication device 1b determines that the newly generated database has not been transmitted (S26: NO), the process returns to step S26, and the database 11c from the other in-vehicle communication devices 1c and 1d. , 11d and the process of generating a new database by the in-vehicle communication device 1a is completed, and the process waits until it is determined that the newly generated database is transmitted.

  When it is determined that the newly generated database is transmitted (S26: YES), the control unit 10b of the in-vehicle communication device 1b receives the newly generated and transmitted database (step S27). The control unit 10b of the in-vehicle communication device 1b updates the database 11b of the storage unit 13b to the received new database (Step S28), and ends the process.

  A new database is created in one in-vehicle communication device 1a operating as a master by the processing of each control unit 10a, 10b, 10c, 10d of the in-vehicle communication devices 1a, 1b, 1c, 1d shown in the flowcharts of FIGS. It is generated at a time and transmitted to the other in-vehicle communication devices 1b, 1c, 1d connected to the bus type. Therefore, the newly generated databases are received almost simultaneously by the in-vehicle communication devices 1b, 1c, and 1d, and are updated as the respective databases 11a, 11b, 11c, and 11d.

  Here, the details of the process in which the control unit 10a of the in-vehicle communication device 1a shown in step S15 of the flowchart of FIG. 4 generates a new database using the data transmitted in step S25 of the flowchart of FIG. Explained. FIG. 6 is a schematic diagram conceptually showing a process in which the control unit 10a of the in-vehicle communication device 1a in the first embodiment generates a new database. Each cylindrical shape represents the databases 11a, 11b, 11c, and 11d, and the shaded portion represents predetermined data set in each, that is, a predetermined area in the databases 11a, 11b, 11c, and 11d. .

  In the first embodiment, the entire databases 11b, 11c, and 11d are transmitted as data from the in-vehicle communication devices 1b, 1c, and 1d. Each of the four cylindrical shapes in the upper part of the figure shown in FIG. 6 has a database 11a stored in the storage unit 13a of each in-vehicle communication device 1a and each database 11b transmitted from each in-vehicle communication device 1b, 1c, 1d. , 11c, 11d.

  The control unit 10a of the in-vehicle communication device 1a reads out necessary data from the entire databases 11b, 11c, and 11d temporarily stored in the storage unit 13a in a new database generation process, and creates a new database. Regenerate. The necessary data is predetermined data for each of the in-vehicle communication devices 1a, 1b, 1c, and 1d stored in the storage unit 13a of the in-vehicle communication device 1a. That is, as in the flow of the arrows shown in the schematic diagram of FIG. 6, the data in one area of the newly generated database is the data read from the corresponding area of the database 11b transmitted from the in-vehicle communication device 1b. The data in the other area is recorded, the data read from the corresponding area in the database 11c transmitted from the in-vehicle communication device 1c is recorded, and the data in the other area is stored in its own storage unit 13b. The data read from the corresponding area of the database 11a is recorded.

  Each ECU 4a to which each in-vehicle communication device 1a, 1b, 1c, 1d is connected by the processing of each control unit 10a, 10b, 10c, 10d of the in-vehicle communication device 1a, 1b, 1c, 1d according to the present invention. , 4a, ..., 4b, 4b, ..., 4c, 4c, ..., 4d, 4d, ..., new databases reflecting the updated data are generated, and the databases 11a, 11b, The contents of 11c and 11d are synchronized with the contents of the newly generated database.

  In addition, when the in-vehicle communication devices 1b, 1c, and 1d transmit data to the in-vehicle communication device 1a, they select any data from the databases 11b, 11c, and 11d stored in the storage units 13b, 13c, and 13d, respectively. The contents of the databases 11a, 11b, 11c, and 11d of each of the in-vehicle communication devices 1a, 1b, 1c, and 1d are made the same with a simple configuration that reads the entire databases 11b, 11c, and 11d without performing the process of reading out The problem of the present invention of synchronizing can be solved.

  Further, since the other in-vehicle communication devices 1b, 1c, and 1d that transmit data to one in-vehicle communication device 1a transmit data according to the transmission priority set when transmitting the data, the data transmission Collisions are avoided and data can be transmitted efficiently in an orderly manner.

(Embodiment 2)
In the first embodiment, the entire databases 11b, 11c, and 11d are respectively transmitted as data transmitted from the in-vehicle communication devices 1b, 1c, and 1d to the in-vehicle communication device 1a. On the other hand, in Embodiment 2 described below, predetermined data stored in the storage units 13b, 13c, and 13d from the respective databases 11b, 11c, and 11d from the in-vehicle communication devices 1b, 1c, and 1d. Only read and transmitted.

  In Embodiment 1, the control unit 10b of the in-vehicle communication device 1b determines whether or not the transmission priority is higher than the other in-vehicle communication devices 1c and 1d when transmitting data. It is configured to transmit when it is determined that is high. On the other hand, in Embodiment 2 described below, the in-vehicle communication devices 1b, 1c, 1d transmit according to the transmission order stored in the storage units 13, 13c, 13d.

  Since the configuration of the in-vehicle communication system in the second embodiment is the same as that of the in-vehicle communication system in the first embodiment, detailed description thereof is omitted. The second embodiment is different from the first embodiment in the content of data that the in-vehicle communication devices 1b, 1c, and 1d transmit to the in-vehicle communication device 1a and the method for generating a new database in the in-vehicle communication device 1a. In addition, since the in-vehicle communication devices 1b, 1c, and 1d determine the transmission order when transmitting data to the in-vehicle communication device 1a, the processing procedures of the in-vehicle communication devices 1a, 1b, 1c, and 1d are described below. Description will be made using the same reference numerals as those in the first embodiment.

  In the second embodiment, the transmission order is stored in the storage units 131b, 13c, and 13d of the in-vehicle communication devices 1b, 1c, and 1d.

  The processing of the control unit 10a of the in-vehicle communication device 1a differs from the processing of generating a new database as the contents of data transmitted from the in-vehicle communication devices 1b, 1c, 1d are different. Since the other steps are the same as the processing procedure shown in the flowchart of FIG. 4 in the first embodiment, detailed description thereof is omitted. Details of processing for generating a new database will be described later.

  FIG. 7 illustrates a processing procedure in which the control unit 10b of the in-vehicle communication device 1b according to the second embodiment reads and transmits predetermined data from the database 11b, receives a newly generated database, and synchronizes with the same content. It is a flowchart which shows an example. Since the processing procedures of the control units 10c and 10d of the other in-vehicle communication devices 1c and 1d are the same as the processing procedures of the control unit 10b of the in-vehicle communication device 1b, detailed description thereof is omitted.

  The processing procedure of the control unit 10b of the in-vehicle communication device 1b according to the second embodiment shown in the flowchart of FIG. 7 is the same as that of the processing shown in the flowchart of FIG. 5 in steps S31 and S36 to S38. 1 is the same as the process from step S21 and step S26 to step S28 of the control unit 10b of the in-vehicle communication device 1b in FIG. 1, and thus detailed description thereof will be omitted, and the process procedure from step S32 to step S35 will be described below.

  When the control unit 10b of the in-vehicle communication device 1b determines that a signal instructing transmission start has been received (S31: YES), it reads predetermined data from the database 11b of the storage unit 13b (step S32). Specifically, data in a predetermined area in the database 11b stored in the storage unit 13b is read.

  The control part 10b of the vehicle-mounted communication apparatus 1b reads the transmission order memorize | stored in the memory | storage part 13b, and judges whether it is a turn which self transmits (step S33). Since the in-vehicle communication devices 1b, 1c, and 1d are connected to the communication line 2 in a bus form, after receiving the transmission start instruction signal, it is detected whether or not the other in-vehicle communication devices 1c and 1d are transmitted. can do. Therefore, when the transmission order stored in the storage unit 13b is No. 1, it can be determined that it is the number to be transmitted by itself even if it is not transmitted from the other in-vehicle communication devices 1c and 1d. If the transmission order is No. 2, it can be determined that the transmission order is not the one until the transmission from any of the other in-vehicle communication devices 1c and 1d is completed.

  If the control unit 10b of the in-vehicle communication device 1b determines that it is not the turn to be transmitted by itself (S33: NO), the control unit 10b waits until the transmission from the other in-vehicle communication devices 1c and 1d is completed (step S34), and performs processing. It returns to step S33 and continues the process of step S33 and step S34 until it judges that it is the turn which self transmits.

  When the control unit 10b of the in-vehicle communication device 1b determines that it is the number to be transmitted (S33: YES), it transmits the predetermined data read in step S32 (step S35).

  Each ECU 4a, 4a to which each in-vehicle communication device 1a, 1b, 1c, 1d is connected by processing of each control unit 10a, 10b, 10c, 10d of in-vehicle communication device 1a, 1b, 1c, 1d in the second embodiment. , ..., 4b, 4b, ..., 4c, 4c, ..., 4d, 4d, ..., a database in which the updated data is reflected is generated. A new database is generated at one time by one in-vehicle communication device 1a operating as a master, and transmitted to the other in-vehicle communication devices 1b, 1c, 1d connected to the bus type. Therefore, the newly generated databases are received almost simultaneously by the in-vehicle communication devices 1b, 1c, and 1d, and are updated as the respective databases 11a, 11b, 11c, and 11d.

  Details of the process in which the control unit 10a of the in-vehicle communication device 1a generates a new database in the second embodiment will be described below. FIG. 8 is a schematic diagram conceptually showing a process in which the control unit 10a of the in-vehicle communication device 1a in the second embodiment generates a new database. Each cylindrical shape of the broken line represents the databases 11a, 11b, 11c, and 11d, and the shaded portion of the solid line represents predetermined data set in each, that is, a predetermined area in the databases 11a, 11b, 11c, and 11d. Represents.

  In the second embodiment, predetermined data in the databases 11b, 11c, and 11d is transmitted from the in-vehicle communication devices 1b, 1c, and 1d. The four cylinders in the upper part of the figure shown in FIG. 8 are the respective databases 11a, 11b, 11c, and 11d of the in-vehicle communication devices 1a, 1b, 1c, and 1d. These are predetermined data in the database 11a of the in-vehicle communication device 1a, and predetermined data in the databases 11b, 11c, and 11d set from the respective in-vehicle communication devices 1b, 1c, and 1d.

  The control unit 10a of the in-vehicle communication device 1a includes predetermined data in the database 11a stored in the storage unit 13a and predetermined in each of the in-vehicle communication devices 1b, 1c, and 1d temporarily stored in the storage unit 13a. Create a new database from the data. As in the flow of the arrows shown in the schematic diagram of FIG. 8, the control unit 10a of the in-vehicle communication device 1a records predetermined data read from the database 11a in a corresponding area in the new database. Moreover, the control part 10a of the vehicle-mounted communication apparatus 1a records the data transmitted from the vehicle-mounted communication apparatus 1b as a predetermined data set in the vehicle-mounted communication apparatus 1b in a corresponding area in a new database. Similarly, the control unit 10a of the in-vehicle communication device 1a records the data transmitted from the in-vehicle communication device 1c as predetermined data set in the in-vehicle communication device 1c in a corresponding area in a new database, and performs in-vehicle communication. Data transmitted from the device 1d is recorded in a corresponding area in a new database as predetermined data set in the in-vehicle communication device 1d.

  Each ECU 4a to which each in-vehicle communication device 1a, 1b, 1c, 1d is connected by the processing of each control unit 10a, 10b, 10c, 10d of the in-vehicle communication device 1a, 1b, 1c, 1d according to the present invention. , 4a, ..., 4b, 4b, ..., 4c, 4c, ..., 4d, 4d, ..., new databases reflecting the updated data are generated, and the databases 11a, 11b, The contents of 11c and 11d are synchronized with the contents of the newly generated database.

  In addition, when the in-vehicle communication devices 1b, 1c, and 1d transmit data to the in-vehicle communication device 1a, predetermined data stored in the storage units 13b, 13c, and 13d from the databases 11a, 11b, 11c, and 11d, respectively, respectively. Data is read and only predetermined data is transmitted. Therefore, the amount of data transmitted to the communication line 2 is reduced, and the contents of the databases 11a, 11b, 11c, and 11d of the in-vehicle communication devices 1a, 1b, 1c, and 1d are synchronized with the same contents. Can be solved.

  Further, since the other in-vehicle communication devices 1b, 1c, and 1d that transmit data to one in-vehicle communication device 1a transmit data according to the transmission priority order that is set when transmitting the data, the data transmission Collisions are avoided and data is transmitted efficiently in an orderly manner.

(Embodiment 3)
In the first and second embodiments, the in-vehicle communication device 1a operating as a master transmits a transmission start instruction signal as a trigger for the in-vehicle communication devices 1b, 1c, and 1d to transmit data. On the other hand, in Embodiment 3 described below, it is determined whether or not the in-vehicle communication devices 1b, 1c, and 1d have reached transmission times (cycles) that are set as triggers for transmitting data.

  In the first embodiment, the entire databases 11b, 11c, and 11d are transmitted as data as the contents of data transmitted by the in-vehicle communication devices 1b, 1c, and 1d. In the second embodiment, only predetermined data stored in the storage unit in each of the databases 11b, 11c, and 11d is read and transmitted. On the other hand, in Embodiment 3 described below, the in-vehicle communication devices 1b, 1c, and 1d transmit only updated data in the databases 11b, 11c, and 11d included in the in-vehicle communication device 1a.

  Furthermore, in the first embodiment and the second embodiment, the order in which the in-vehicle communication devices 1b, 1c, and 1d transmit data follows the priority and the transmission order. On the other hand, in Embodiment 3 shown below, it transmits in the transmission period time-divided so as to respond | correspond to each vehicle-mounted communication apparatus 1b, 1c, 1d.

  Since the configuration of the in-vehicle communication system in the third embodiment is the same as that of the in-vehicle communication system in the first and second embodiments, detailed description thereof is omitted. In the third embodiment, the in-vehicle communication device 1b, 1c, 1d has a trigger for starting transmission of data to the in-vehicle communication device 1a, the content of data to be transmitted, and a method for generating a new database in the in-vehicle communication device 1a associated therewith. Different from Embodiments 1 and 2. Further, the first and second embodiments differ in how the transmission order is determined when the in-vehicle communication devices 1b, 1c, and 1d transmit data to the in-vehicle communication device 1a. Hereinafter, the processing procedure of each of the in-vehicle communication devices 1a, 1b, 1c, and 1d will be described using the same reference numerals as those in the first and second embodiments.

  In the third embodiment, the in-vehicle communication devices 1b, 1c, and 1d use the data transmission start trigger as to whether or not the set transmission times have arrived. Accordingly, the storage times 13b, 13c, and 13d of the in-vehicle communication devices 1b, 1c, and 1d store the transmission times that are set respectively. Since the in-vehicle communication devices 1b, 1c, 1d periodically transmit data read from the databases 11b, 11c, 11d to the in-vehicle communication device 1a, the storage units 13b, 13c, 13d of the in-vehicle communication devices 1b, 1c, 1d The transmission cycle and the starting time of the cycle may be stored. The same time may be set as the transmission time or the start time of the transmission cycle stored in the storage units 13b, 13c, 13d of the in-vehicle communication devices 1b, 1c, 1d, or the in-vehicle communication devices 1b, 1c, 1d It may be set so that the transmission timing of each shifts.

  Further, the control units 10b, 10c, and 10d of the in-vehicle communication devices 1b, 1c, and 1d function as a transmission timer in order to determine whether or not the set transmission times have arrived.

  In the third embodiment, a transmission period in which each in-vehicle communication device 1a, 1b, 1c, 1d can occupy the communication line 2 for transmission is set for the communication line 2 in a time division manner. FIG. 9 is a schematic diagram schematically showing an example of transmission periods set for each of the in-vehicle communication devices 1a, 1b, 1c, and 1d on the communication line 2 in the third embodiment. The major axis direction of each quadrangle represents a transmission period divided into time divisions, and the alphabetic characters labeled on each quadrangle indicate the vehicle-mounted communication devices 1a, 1b, 1c, and 1d to which the transmission period is assigned.

  As shown in FIG. 9, when transmitting data to the in-vehicle communication device 1a, the in-vehicle communication device 1b can transmit only during the transmission period labeled “B”. Similarly, the in-vehicle communication device 1c can transmit data only during the transmission period labeled “C”, and the in-vehicle communication device 1d can transmit data only during the transmission period labeled “D”. it can. When the in-vehicle communication device 1a also transmits a newly generated database, it can be transmitted only during the transmission period labeled “A”, so the database is divided and transmitted.

  The transmission / reception of data through the communication line 2 may be configured in accordance with FlexRay (registered trademark) of in-vehicle network communication adopting the time trigger method shown in FIG. 9, but is not limited to FlexRay.

  FIG. 10 is a flowchart illustrating an example of a processing procedure in which the control unit 10a of the in-vehicle communication device 1a according to the third embodiment receives data from the other in-vehicle communication devices 1b, 1c, and 1d and generates a new database.

  The control unit 10a of the in-vehicle communication device 1a determines whether data in the databases 11b, 11c, and 11d is transmitted from the other in-vehicle communication devices 1b, 1c, and 1d (step S41). When determining that data is not transmitted (S41: NO), the control unit 10a of the in-vehicle communication device 1a returns the process to step S41 and waits until it is determined that data is transmitted.

  When the control unit 10a of the in-vehicle communication device 1a determines that data is transmitted from the other in-vehicle communication devices 1b, 1c, 1d (S41: YES), the transmitted data and the transmitted data are stored in the database. The specific information indicating which of the data is received is temporarily stored in the storage unit 13a (step S42). The specific information will be described together with processing procedures of the on-vehicle communication devices 1b, 1c, and 1d described later.

  The control unit 10a of the in-vehicle communication device 1a determines whether or not all data has been received from all the other in-vehicle communication devices 1b, 1c, and 1d (step S43). If the control unit 10a of the in-vehicle communication device 1a determines that not all data is received from all the other in-vehicle communication devices 1b, 1c, 1d (S43: NO), the process returns to step S41 to return the in-vehicle communication device. The process of receiving all data from all 1b, 1c, 1d is continued.

  In Embodiment 3, each in-vehicle communication device 1b, 1c, 1d can transmit only during the time-divided transmission period. Therefore, when all the data cannot be transmitted during the transmission period, the data is transmitted in multiple times. To do.

  When the control unit 10a of the in-vehicle communication device 1a determines that data has been received from all the other in-vehicle communication devices 1b, 1c, and 1d (S43: YES), the data temporarily stored in the storage unit 13a is used. Then, a new database is generated (step S44). Details of generation of a new database by the control unit 10a in step S44 will be described later.

  The control unit 10a of the in-vehicle communication device 1a updates its own database 11a to the new database generated in step S44 (step S45), and the new in-vehicle communication devices 1b, 1c, and 1d generated in step S44. The database is transmitted (step S46), and the process is terminated.

  FIG. 11 shows a processing procedure in which the control unit 10b of the in-vehicle communication device 1b according to the third embodiment reads and transmits updated data from the database 11b, receives the newly generated database, and synchronizes with the same content. It is a flowchart which shows the example of. Since the processing procedures of the control units 10c and 10d of the other in-vehicle communication devices 1c and 1d are the same as the processing procedures of the control unit 10b of the in-vehicle communication device 1b, detailed description thereof is omitted.

  The control unit 10b of the in-vehicle communication device 1b functions as a transmission timer to determine whether or not the transmission time stored in the storage unit 13b has been reached (step S51). If the control unit 10b of the in-vehicle communication device 1b determines that the transmission time has not been reached (S51: NO), the process returns to step S51 and waits until it is determined that the transmission time has been reached.

  When determining that the transmission time has been reached (S51: YES), the control unit 10b of the in-vehicle communication device 1b extracts and reads the updated data from the database 11b of the storage unit 13b (step S52). The control unit 10b of the in-vehicle communication device 1b temporarily stores, in the storage unit 13b, specific information that can specify a read destination area in the database 11b for the data read in step S52. The specific information is information that can specify which data in the newly generated database the data to be transmitted is, and may be information that specifies an area (address) when recorded in the database 11b. The attribute name or ID (Identifier) of the data may be used.

  Extraction of the updated data in step S52 is an area (address) recorded in the data database when data is received from each ECU 4b, 4b,... Connected to the control unit 10b of the in-vehicle communication device 1b. The attribute name or ID of the data is stored in the storage unit 13b so that the updated data can be determined. The data updated by the control of the control unit 10b of the in-vehicle communication device 1b may be stored in the same manner. The data stored in the storage unit 13b is deleted for data for which transmission in step S54 described later has been completed.

  The control unit 10b of the in-vehicle communication device 1b determines whether or not it is the transmission period set in the in-vehicle communication device 1b for the communication line 2 (step S53). If the control unit 10b of the in-vehicle communication device 1b determines that it is not the set transmission period (S53: NO), the process returns to step S53 and waits until it is determined that it is the transmission period.

  When the control unit 10b of the in-vehicle communication device 1b determines that it is the set transmission period (S53: YES), the data read in step S52 and the specific information stored in the storage unit 13b are transmitted during the transmission period. It divides | segments as possible and transmits to the vehicle-mounted communication apparatus 1a (step S54).

  The control unit 10b of the in-vehicle communication device 1b determines whether all the data and specific information read in step S52 have been transmitted (step S55). If the control unit 10b of the in-vehicle communication device 1b determines that the data read out in step S52 and the specific information are not all transmitted (S55: NO), the process returns to step S53 and is the next transmission period. Wait until it is determined.

  When the control unit 10b of the in-vehicle communication device 1b determines that all the data and specific information read in step S52 have been transmitted (S55: YES), a newly generated database is transmitted from the in-vehicle communication device 1a. It is determined whether or not there is (step S56).

  When the controller 10b of the in-vehicle communication device 1b determines that the newly generated database has not been transmitted (S56: NO), the control unit 10b returns the process to step S56, and the transmission from the in-vehicle communication devices 1b, 1c, 1d and The process waits until it is determined that the newly generated database has been transmitted after the generation process of the new database by the in-vehicle communication device 1a is completed.

  When it is determined that the newly generated database is transmitted (S56: YES), the control unit 10b of the in-vehicle communication device 1b receives the newly generated and transmitted database (step S57). The control part 10b of the vehicle-mounted communication apparatus 1b updates the database 11b of the memory | storage part 13b to the new database which received (step S58), and complete | finishes a process.

  It is also possible to determine whether or not all newly generated databases have been received by transmitting a signal indicating the end of transmission from the in-vehicle communication device 1a.

  Each ECU 4a, 4a to which each in-vehicle communication device 1a, 1b, 1c, 1d is connected by processing of each control unit 10a, 10b, 10c, 10d of in-vehicle communication device 1a, 1b, 1c, 1d in the third embodiment. ..., 4b, 4b, ..., 4c, 4c, ..., 4d, 4d, ..., a database reflecting the updated data is generated. A new database is generated at one time by one in-vehicle communication device 1a operating as a master, and transmitted to the other in-vehicle communication devices 1b, 1c, 1d connected to the bus type. Therefore, the newly generated databases are received almost simultaneously by the in-vehicle communication devices 1b, 1c, and 1d, and are updated as the respective databases 11a, 11b, 11c, and 11d.

  Details of the process in which the control unit 10a of the in-vehicle communication device 1a generates a new database in the third embodiment will be described below. FIG. 12 is a schematic diagram conceptually illustrating a process in which the control unit 10a of the in-vehicle communication device 1a according to the third embodiment generates a new database. Each cylindrical shape of a broken line represents the database 11a, 11b, 11c, 11d and predetermined data set in each. The shaded portion represents the updated data, and the positions with respect to the broken-line cylinder represent the areas occupied by the databases 11a, 11b, 11c, 11d and the new database, respectively.

  In Embodiment 3, the updated data in the databases 11b, 11c, and 11d is transmitted from the in-vehicle communication devices 1b, 1c, and 1d. In addition, updated data is transmitted from the in-vehicle communication devices 1b, 1c, and 1d, and specific information for specifying which data in the database is the updated data is transmitted.

  The control unit 10a of the in-vehicle communication device 1a generates and records each data in a new database based on the specific information. As in the flow of the arrows shown in the schematic diagram of FIG. 12, the control unit 10a of the in-vehicle communication device 1a stores the updated data in the database 11a and stores it in the corresponding area in the new database. To do. Moreover, the control part 10a of the vehicle-mounted communication apparatus 1a memorize | stores the data transmitted from the vehicle-mounted communication apparatus 1b in the applicable area | region in a new database as data specified by the specific information transmitted together. Similarly, the control unit 10a of the in-vehicle communication device 1a records the data transmitted from the in-vehicle communication device 1c in the corresponding area in the new database as data specified by the specific information transmitted together, and the in-vehicle communication device The data transmitted from 1d is recorded in the corresponding area in the new database as data specified by the specific information transmitted together.

  Each ECU 4a to which each in-vehicle communication device 1a, 1b, 1c, 1d is connected by the processing of each control unit 10a, 10b, 10c, 10d of the in-vehicle communication device 1a, 1b, 1c, 1d according to the present invention. , 4a, ..., 4b, 4b, ..., 4c, 4c, ..., 4d, 4d, ..., new databases reflecting the updated data are generated, and the databases 11a, 11b, The contents of 11c and 11d are synchronized with the contents of the newly generated database.

  Further, when transmitting data to the in-vehicle communication device 1a, the in-vehicle communication devices 1b, 1c, and 1d read and transmit only the updated data from the respective databases 11a, 11b, 11c, and 11d. Therefore, the amount of data transmitted to the communication line 2 is reduced, and the contents of the databases 11a, 11b, 11c, and 11d of the in-vehicle communication devices 1a, 1b, 1c, and 1d are synchronized with the same contents. Can be solved.

  Further, since the other in-vehicle communication devices 1b, 1c, and 1d that transmit data to one in-vehicle communication device 1a transmit data only during the transmission period that is set when transmitting the data, the data transmission conflict Is avoided and data is transmitted efficiently.

  In Embodiment 3, the control units 10b, 10c, and 10d of the in-vehicle communication devices 1b, 1c, and 1d are configured to transmit updated data and specific information. However, the present invention is not limited to this, and the control units 10b, 10c, and 10d of the in-vehicle communication devices 1b, 1c, and 1d transmit the entire databases 11b, 11c, and 11d, and may read and transmit predetermined data. Specific information for specifying the updated data may be transmitted. Thereby, the control part 10a of the vehicle-mounted communication apparatus 1a can read the data updated from the transmitted data, and can produce | generate a new database.

  Further, the specific information is not necessarily information indicating which data in the database is the updated data. The specific information may be configured to transmit information indicating which data in the database is to be transmitted. In this case, the controller of the in-vehicle communication device 1a determines which data in the database is transmitted when only predetermined data is read and transmitted, and when only updated data is read and transmitted. 10a can detect and generate a new database.

  In the first to third embodiments, a configuration in which one in-vehicle communication device 1a transmits an instruction to start transmission as a trigger for transmitting data from the in-vehicle communication devices 1b, 1c, and 1d, and a set transmission time (cycle). The configuration for determining whether or not it has been reached has been described. The contents of data transmitted by the in-vehicle communication devices 1b, 1c, and 1d are stored in the storage units in the respective databases 11b, 11c, and 11d as a configuration in which the entire databases 11b, 11c, and 11d are transmitted as data. The configuration in which only predetermined data is read and transmitted, and the configuration in which only updated data in each of the databases 11b, 11c, and 11d are extracted and transmitted have been described. Furthermore, as a method for determining the transmission order when the in-vehicle communication devices 1b, 1c, 1d transmit data to one in-vehicle communication device 1a, a configuration for transmitting according to the set priority, a configuration for transmitting according to the set transmission order, And the structure which transmits in the transmission period divided by time was demonstrated. Of course, the configuration of the trigger for transmitting each data, the configuration of the contents of the data to be transmitted, and the configuration of how to determine the transmission order at the time of transmission are not limited to the combinations shown in the embodiments of the first to third embodiments. is there.

  About the content of the data which each vehicle-mounted communication apparatus 1b, 1c, 1d transmits, a structure respectively different with each vehicle-mounted communication apparatus 1b, 1c, 1d may be sufficient. However, in the configuration in which the contents of the data transmitted by the in-vehicle communication devices 1b, 1c, and 1d are different, the contents of the in-vehicle communication device 1a that receives the data transmitted from the in-vehicle communication devices 1b, 1c, and 1d The information which can identify whether it transmits with is memorized. When information that can identify that the entire database 11b is transmitted from the in-vehicle communication device 1b is stored in the storage unit 13a of the in-vehicle communication device 1a, the control unit 10a of the in-vehicle communication device 1a transmits from the in-vehicle communication device 1b. The read data is read as the database 11b, and a predetermined area set in the in-vehicle communication device 1b is further read from the read data and recorded in a new database.

  In the first to third embodiments, the in-vehicle communication device 1a is configured to operate as a master. However, the present invention is not limited to this, and any of the in-vehicle communication devices 1a, 1b, 1c, and 1d may operate as a master.

  Further, as shown in the flowchart of FIG. 4, the in-vehicle communication device 1a operating as the master transmits an instruction signal instructing the start of transmission to the other in-vehicle communication devices 1b, 1c, and 1d. However, the present invention may be configured such that an in-vehicle communication device 1b other than the in-vehicle communication device 1a operating as a master transmits an instruction signal instructing transmission start. For example, the transmission start cycle is stored in any of the in-vehicle communication devices 1b, 1c, and 1d, and the transmission start instruction signal is transmitted to the other in-vehicle communication devices 1b, 1c, and 1d each time the cycle arrives. Good.

  In the first to third embodiments, the in-vehicle communication devices 1a, 1b, 1c, and 1d are configured as devices different from each ECU. However, the in-vehicle communication device may be one of the ECUs in each group, or may have a configuration in which a database is provided in the storage unit and connected to an ECU having a similar database in another group.

  In the first to third embodiments, the in-vehicle communication devices 1a, 1b, 1c, and 1d have databases 11a, 11b, 11c, and 11d having the same configuration, and the in-vehicle communication device 1a newly generates the entire database. The contents of the databases 11a, 11b, 11c, and 11d are configured to completely match by updating the whole with the in-vehicle communication devices 1a, 1b, 1c, and 1d. However, in the present invention, the contents of the databases 11a, 11b, 11c, and 11d do not have to match completely. .., 4b, 4b,..., 4c, 4c,..., 4d, 4d,. The contents of the databases 11a, 11b, 11c, and 11d may be synchronized with the same contents.

It is a block diagram which shows the structure of the vehicle-mounted communication system which concerns on this invention. It is a schematic diagram which represents notionally the structure for collecting and distributing a database between the vehicle-mounted communication apparatuses of the vehicle-mounted communication system which concerns on this invention. It is a block diagram which shows the internal structure of the vehicle-mounted communication apparatus which concerns on this invention. 4 is a flowchart illustrating an example of a processing procedure in which the control unit of the in-vehicle communication device according to Embodiment 1 receives data from another in-vehicle communication device and generates a new database. 5 is a flowchart illustrating an example of a processing procedure in which the control unit of the in-vehicle communication device according to Embodiment 1 reads and transmits data from a database, receives a newly generated database, and synchronizes with the same content. It is a schematic diagram which shows notionally the process in which the control part of the vehicle-mounted communication apparatus in Embodiment 1 produces | generates a new database. It is a flowchart which shows the example of the process sequence which the control part of the vehicle-mounted communication apparatus in Embodiment 2 reads and transmits predetermined data from a database, receives the newly produced | generated database, and synchronizes with the same content. It is a schematic diagram which shows notionally the process in which the control part of the vehicle-mounted communication apparatus in Embodiment 2 produces | generates a new database. 10 is a schematic diagram schematically showing an example of a transmission period set for each in-vehicle communication device on a communication line in Embodiment 3. FIG. 10 is a flowchart illustrating an example of a processing procedure in which a control unit of an in-vehicle communication device according to Embodiment 3 receives data from another in-vehicle communication device and generates a new database. 14 is a flowchart illustrating an example of a processing procedure in which the control unit of the in-vehicle communication device according to the third embodiment reads and transmits updated data from a database, receives a newly generated database, and synchronizes with the same content. . It is a schematic diagram which shows notionally the process in which the control part of the vehicle-mounted communication apparatus in Embodiment 3 produces | generates a new database.

Explanation of symbols

1a, 1b, 1c, 1d In-vehicle communication device 10a, 10b, 10c, 10d Control unit 11a, 11b, 11c, 11d Database 13a, 13b, 13c, 13d Storage unit 2 Communication line 3a, 3b, 3c, 3d In-vehicle communication line 4a , 4b, 4c, 4d ECU

Claims (14)

In an in-vehicle communication system including a plurality of in-vehicle devices that transmit and receive data and an in-vehicle communication line that connects the in-vehicle devices divided into a plurality of groups for each group,
Connected to the in-vehicle communication line for each group, having a database for recording data transmitted / received via each in-vehicle device and the in-vehicle communication line, and having a bus type as a communication line different from the in-vehicle communication line For each group equipped with in-vehicle communication devices connected to
Each in-vehicle communication device includes means for transmitting data in a database of the in-vehicle communication device to another in-vehicle communication device via the communication line
One in-vehicle communication device among the plurality of in-vehicle communication devices is configured to receive data transmitted from the other in-vehicle communication device via the communication line;
Generation means for newly generating a database based on data transmitted from the other in-vehicle communication device via the communication line and / or a database included in the communication device;
Means for transmitting the generated database to the other in-vehicle communication device via the communication line,
The other in-vehicle communication device updates its own database to the database transmitted from the one in-vehicle communication device. The in-vehicle communication system according to claim 1, wherein the other in-vehicle communication device is configured to transmit all data in a database included in the other in-vehicle communication device via the communication line. In each in-vehicle communication device, predetermined data in the database is set for each in-vehicle communication device,
The said other vehicle-mounted communication apparatus transmits only the said predetermined data in the database which it has to said one vehicle-mounted communication apparatus via the said communication line, The said 1st vehicle-mounted communication apparatus is characterized by the above-mentioned. In-vehicle communication system. The said other vehicle-mounted communication apparatus transmits only the updated data in the database which it has to said one vehicle-mounted communication apparatus via the said communication line, The said 1st vehicle-mounted communication apparatus is characterized by the above-mentioned. In-vehicle communication system. The one in-vehicle communication device includes means for storing predetermined data in a database set for each in-vehicle communication device,
Means for reading the predetermined data set in the other in-vehicle communication device from the data transmitted from the other in-vehicle communication device, and / or the predetermined data from the database of its own,
The in-vehicle communication system according to any one of claims 1 to 3, wherein the generation unit generates the read data as the predetermined data in a new database. The other in-vehicle communication device includes means for transmitting specific information for specifying which data in the database is to be transmitted,
The said generation | production means produces | generates the data transmitted from said other vehicle-mounted communication apparatus as data specified by the said specific information in a new database, Any one of Claim 1 thru | or 4 characterized by the above-mentioned. The in-vehicle communication system according to claim 1. The other in-vehicle communication device has means for transmitting, to the one in-vehicle communication device, specific information for specifying which data in the database is the updated data in its own database. Prepared,
The one in-vehicle communication device includes means for reading data specified by the transmitted specific information from data transmitted from another in-vehicle communication device,
The in-vehicle communication system according to any one of claims 1 to 4, wherein the generation unit generates read data as the specified data in a new database. One of the other in-vehicle communication devices is configured to transmit all data in the database that it has,
One of the other in-vehicle communication devices is configured to transmit only predetermined data that is set in the database that it has,
One of the other in-vehicle communication devices transmits only updated data in its own database and specific information for specifying which data in the database is to be transmitted. And
The one in-vehicle communication device stores, for each of the other in-vehicle communication devices, transmission of all data, transmission of only predetermined data, or transmission of only updated data, and
Means for storing predetermined data in a database set for each in-vehicle communication device;
Means for reading predetermined data set in the other in-vehicle communication device from data transmitted from the other in-vehicle communication device stored according to the transmission of all data;
Means for reading out the data transmitted from the other in-vehicle communication device stored according to the transmission of only the predetermined data as the predetermined data set in the in-vehicle communication device;
Means for reading data transmitted from another in-vehicle communication device stored according to transmission of only updated data as data specified by the transmitted specific information, and
The in-vehicle communication system according to claim 1, wherein the generation unit generates the read data as the predetermined data or the specified data in a new database. Any one of the in-vehicle communication devices includes means for transmitting an instruction to start transmission,
The in-vehicle communication system according to any one of claims 1 to 8, wherein the other in-vehicle communication device transmits data when the instruction is received. Priorities are set for the other vehicle-mounted communication devices,
The in-vehicle communication system according to any one of claims 1 to 9, wherein the other in-vehicle communication device transmits data in the order according to the set priority. In the other in-vehicle communication device, the transmission order is set,
The in-vehicle communication system according to any one of claims 1 to 9, wherein the other in-vehicle communication device is configured to transmit data in accordance with a set transmission order. Each in-vehicle communication device has a transmission time,
The in-vehicle communication system according to any one of claims 1 to 8, wherein the other in-vehicle communication device transmits data at a set transmission time. Each in-vehicle communication device has a time-division transmission period,
The in-vehicle communication system according to any one of claims 1 to 9 and claim 12, wherein the other in-vehicle communication device transmits data during a set transmission period. It is transmitted from an in-vehicle device included in one group using an in-vehicle communication system composed of a plurality of in-vehicle devices that transmit and receive data and an in-vehicle communication line that divides each in-vehicle device into a plurality of groups and connects each group. In-vehicle communication method for transmitting data to in-vehicle devices included in other groups,
A database for recording data transmitted from each in-vehicle device connected to the in-vehicle communication line for each group and connected to the communication line different from the in-vehicle communication line in the in-vehicle communication system. A plurality of in-vehicle communication devices are used for each group,
Other in-vehicle communication devices other than one in-vehicle communication device among the plurality of in-vehicle communication devices transmit data in the database that they have to the one in-vehicle communication device via the communication line,
The one in-vehicle communication device receives data transmitted from the other in-vehicle communication device via the communication line,
Create a new database based on the received data and the database you own,
Send the generated database to the other in-vehicle communication device via the communication line,
The other in-vehicle communication device receives the database transmitted from the one in-vehicle communication device via the communication line,
An in-vehicle communication method characterized by updating a database owned by itself to a received database.

Images