Relay apparatus, communication system and communication method
AssigneesNational University Corporation Nagoya University, Autonetworks Technologies, Ltd., Sumitomo Wiring Systems, Ltd., Sumitomo Electric Industries, Ltd.
InventorsHiroaki Takada, Ryo Kurachi, Yukihiro Miyashita
Life of this patent
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Abstract
Relay apparatuses read the attribute values of data, i.e., numerical information representing measurement values, calculation values, control values, etc., from receive buffers in which data received from ECUs connected thereto is stored, and create trunk frames containing the numerical information and transmit and receive trunk frames via trunk lines. The relay apparatuses derive numerical information from trunk frames received from the other relay apparatuses and renew the numerical information on the data stored in their respective databases using the derived numerical information.
Claims8
1-4. (canceled)
A relay apparatus connected to external apparatuses for transmitting and receiving data containing numerical information and identification information of the numerical information, thereby relaying transmission and reception of data among external apparatuses, comprising:
- a data receiving section for receiving data from at least one of the external apparatuses;
- a data storing section for storing data in a database;
- a data transmitting section for transmitting data read from the database to at least one of the external apparatuses;
- a creating section for creating a data frame containing numerical information on one or a plurality of pieces of data received from at least one of the external apparatuses;
- a data frame transmitting section for transmitting the data frame created by the creating section to another relay apparatus;
- a data frame receiving section for receiving a data frame from another relay apparatus;
- a reading section for reading, in the case that the data frame receiving section received a data frame, numerical information contained in the received data frame;
- and
- a renewing section for renewing numerical information on data in the database according to the numerical information read by the reading section.
A communication system, comprising;
- a plurality of communication apparatus groups, each group being formed of a plurality of communication apparatuses for transmitting and receiving data containing numerical information and identification information of the numerical information;
- and
- a plurality of relay apparatuses to which one or a plurality of communication apparatuses are connected in each of the plurality of communication apparatus groups, the plurality of relay apparatuses being connected mutually to relay transmission and reception of data among the communication apparatuses;
- wherein each of the relay apparatuses includes:
- a data receiving section for receiving data from at least one of the communication apparatuses;
- a data storing section for storing data in a database;
- a data transmitting section for transmitting data read from the database to at least one of the communication apparatuses;
- a creating section for creating a data frame containing numerical information on one or a plurality of pieces of data received from at least one of the communication apparatuses;
- a data frame transmitting section for transmitting the data frame created by the creating section to another relay apparatus;
- a data frame receiving section for receiving a data frame from another relay apparatus;
- a reading section for reading, in the case that the data frame receiving section received data frame, numerical information contained in the received data frame;
- and
- a renewing section for renewing numerical information on data in the own database of each relay apparatus using numerical information read by the reading section.
A communication method using a plurality of relay apparatuses to which one or a plurality of communication apparatuses are connected in each of a plurality of communication apparatus groups, each group being formed of the plurality of communication apparatuses for transmitting and receiving data containing numerical information and identification information of the numerical information and which are mutually connected to relay transmission and reception of data among communication apparatuses
- wherein each of the relay apparatuses performs:
- receiving data from at least one of the communication apparatuses of the group to which the relay apparatus is connected;
- storing data in a database;
- transmitting data read from the database to at least one of the communication apparatuses;
- creating a data frame containing numerical information on one or a plurality of pieces of data received from at least one of the communication apparatuses;
- transmits the created data frame to another relay apparatus;
- reading, in the case that a data frame is received from another relay apparatus, numerical information contained in the received data frame;
- renewing numerical information on data in the own database of each relay apparatus using the read numerical information;
- reading data from the renewed database;
- and
- transmitting the read data to at least one of the communication apparatuses of the group to which the relay apparatus is connected.
Dependencies are inferred from the claim text.