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ID sequence sharing method for vehicle-mounted CAN network messages

A network message and sequence technology, applied in bus network, data exchange network, data exchange through path configuration, etc., can solve the problem of heavy CPU burden, and achieve the effect of improving real-time performance and stability

Active Publication Date: 2020-09-25
NANCHANG UNIV
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  • Application Information

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Problems solved by technology

[0003] Although the dynamic ID sequence method proposed by domestic researchers can enhance the certainty of the message, this method requires each node to receive all the messages on the bus, which is a great burden on the CPU in the node

Method used

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  • ID sequence sharing method for vehicle-mounted CAN network messages
  • ID sequence sharing method for vehicle-mounted CAN network messages

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Experimental program
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Embodiment

[0032] Example: see Figure 1-2 .

[0033] Suppose there are A, B, C, D, E, F nodes, receiving nodes and master nodes. Nodes A~F have messages m1~m6 respectively, and the master node has a preset ID sequence. m1 has the highest priority, and m1~m6 has lower priorities in turn. The sending cycle of messages for nodes A and B is 10ms. The sending period of the D node message is 20ms, and the sending period of the E and F node messages is 30ms. The error threshold for message m4 is set to 2, and the error threshold for message m6 is set to 1. The message communication of each node is as follows: figure 2 shown.

[0034] according to figure 1 In the flow chart of the shared ID sequence method shown, the master node sends the preset ID sequence to nodes A, B, C, D, E, and F at time 0. After a period of time, due to the priority of node A’s message m1 The highest, so send the message m1 to the receiving node and the master node at time t1. After the bus is free, the priority...

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Abstract

The invention discloses an ID sequence sharing method for vehicle-mounted CAN network messages. In vehicle-mounted CAN network communication, a CAN protocol competes for a bus mechanism according to the priorities of the messages, so that when a plurality of messages are sent at the same moment, the uncertainty of message receiving is caused, and the queuing waiting time of low-priority messages is too long. According to the ID sequence sharing method provided by the invention, the CAN network node messages can be sent according to the preset ID sequence, and a node message can be deleted according to the set threshold value when the node message has an error in the transmission process and cannot be sent to the receiving node on time, so that the real-time performance and the stability ofa communication network are improved.

Description

technical field [0001] The invention relates to the field of automobile manufacturing, in particular to a shared ID sequence method for vehicle CAN network messages. Background technique [0002] CAN bus is a serial bus developed by Bosch. Because of its high reliability and low price advantage, it has become the most widely used bus in automobiles. However, in the communication of the vehicle CAN bus, due to the arbitration mechanism of the protocol itself, the message reception is uncertain and the waiting time for low priority messages is too long, which seriously affects the stability and real-time performance of the communication. In response to this problem, foreign researchers proposed the TTCAN protocol, which uses the principle of time division multiplexing to allocate time windows for various messages offline, so as to achieve the purpose of orderly sending messages and enhance the real-time performance of messages. However, the disadvantage of this method is that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/40H04L12/24
CPCH04L12/40006H04L41/0803H04L2012/40215H04L2012/40273
Inventor 张庭芳黄海林曹铭郭劲林常江王旭东
Owner NANCHANG UNIV