US 2010/0150176 A1 · CAN node, and communication method of communication system including CAN node

Abstract

A Controller Area Network (CAN) node includes a conversion and retransmission unit which retransmits a transmit message if the transmit message carries a retransmission ID out of ID codes, by changing the ID code of the transmit message to a retransmission-specific ID corresponding to the retransmission ID, where the ID codes indicate priorities of transmit messages, the retransmission ID indicates that the transmit message is to be retransmitted, and the retransmission-specific ID is an ID code specifically for use in retransmission, and a conversion and reception unit which checks whether an original message corresponding to a retransmit message has been received successfully, the retransmit message being a receive message carrying the retransmission-specific ID, and discards the retransmit message if the original message corresponding to the retransmit message has been received successfully, but converts the ID code of the retransmit message into a retransmission ID corresponding to the retransmission-specific ID if the original message corresponding to the retransmit message has not been received successfully.

Claims14

Dependent claims

A Controller Area Network (CAN) node comprising:

a conversion and retransmission unit which retransmits a transmit message if the transmit message carries a retransmission ID out of ID codes, by changing the ID code of the transmit message to a retransmission-specific ID corresponding to the retransmission ID, where the ID codes indicate priorities of transmit messages, the retransmission ID indicates that the transmit message is to be retransmitted, and the retransmission-specific ID is an ID code specifically for use in retransmission;
and
a conversion and reception unit which checks whether an original message corresponding to a retransmit message has been received successfully, the retransmit message being a receive message carrying the retransmission-specific ID, and discards the retransmit message if the original message corresponding to the retransmit message has been received successfully, but converts the ID code of the retransmit message into a retransmission ID corresponding to the retransmission-specific ID if the original message corresponding to the retransmit message has not been received successfully.

A Controller Area Network (CAN) node which transmits and receives a communication frame via a CAN bus, the CAN node comprising:

after the CAN node transmits a first transmission frame including a transmission ID and data corresponding to the transmission ID, a conversion and retransmission unit which transmits a second transmission frame obtained by replacing the transmission ID of the first transmission frame with a retransmission-specific ID corresponding to the transmission ID;
and
when the CAN node receives a first reception frame including a reception ID and data corresponding to the reception ID, and the reception ID of the first reception frame indicates a retransmission-specific ID, a conversion and reception unit which discards the first reception frame if the data of the first reception frame coincides with data stored in a temporary buffer, and which gets a second reception frame obtained by replacing the retransmission-specific ID of the first reception frame with the reception ID corresponding to the retransmission-specific ID, in a message buffer, if the data of the first reception frame does not coincide with the data stored in the temporary buffer.

A communication method of a communication system which includes a Controller Area Network (CAN) bus, a first and second CAN node coupled to the CAN bus, the communication method comprising:

transmitting a first communication frame including an ID code and data corresponding to the ID code from the first CAN node;
receiving the first communication frame in the second CAN node;
after the first communication frame is transmitted, transmitting a second communication frame obtained by replacing the ID code of the first communication frame with a retransmission-specific ID code, from the first CAN node;
and
receiving the second communication frame in the second CAN node,
wherein the receiving of the first communication frame includes:
storing the data of the first communication frame in a temporary buffer;
and
getting the first communication frame in a message buffer,
wherein the receiving of the second communication frame includes:
comparing the data of the second communication frame with the data stored in the temporary buffer;
discarding the second communication frame received if the data of the second communication frame coincides with the data stored in the temporary buffer;
and
getting a third communication frame obtained by replacing the retransmission-specific ID code of the second communication frame with the ID code corresponding to the retransmission specific ID code, in the message buffer, if the data of the second communication frame does not coincide with the data stored in the temporary buffer.

11 more elements

Dependencies are inferred from the claim text.

CAN node, and communication method of communication system including CAN node

Life of this patent

CAN node, and communication method of communication system including CAN node

Life of this patent

Abstract

Claims14