Dual-redundant CAN bus communication system

Abstract

The invention provides a dual-redundant CAN bus communication system. The dual-redundant CAN bus communication system comprises two CAN buses and a plurality of redundant nodes, wherein the plurality of redundant nodes are simultaneously connected to the two CAN buses; a main-spare type hardware architecture is adopted in each redundant node, wherein each redundant node comprises a redundancy functional module; the redundancy functional module executes: node IDs of all the redundant nodes are sorted according to the size, such that a token ring is established; each redundant node sends an online monitoring message; according to the size sorting of the node IDs, except the node having the maximum node ID, each node sends the online state monitoring message to the node, the node ID value of which is greater than that of the self and the difference value of which is minimum; the node having the maximum node ID in a network sends the online state monitoring message to the node having the minimum node ID; each redundant node judges the state of any channel among the self and other redundant nodes on the CAN bus through the received online monitoring message; once the fact that a default channel of a certain node cannot be used for communicating is found, the default channel is instantly switched to a spare channel to perform bus communication; and thus, normal transmission of network data is ensured.

Description

technical field [0001] The invention relates to the technical field of data communication, in particular to a dual redundant CAN bus communication system. Background technique [0002] Since the birth of the CAN bus communication system in the 1980s, it has been widely used in automobiles, civil and national defense industries. The error detection and error handling mechanism of the CAN protocol itself can well ensure the consistency of system communication, but in some application fields, especially in the defense industry, the CAN bus communication system cannot guarantee that its data link can be used in case of major failures. Continue to maintain good communication quality under the premise. For this reason, it is necessary to formulate a redundant mechanism based on CAN to ensure that the system can continue to carry on the necessary communication under the condition of a major failure. Contents of the invention [0003] The present invention aims at the above-ment...

AI Technical Summary

Problems solved by technology

The error detection and error handling mechanism of the CAN protocol itself can well ensure the consistency of system communication, but in some application fields, especially in the defense industry, the CAN bus communication system cannot guarantee that its data link can be used in case of major failures. Continue to maintain good communication quality under the premise of

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