Multi-node automatic networking method based on can bus

Abstract

The invention discloses a multi-node automatic networking method based on CAN bus. The CAN node is powered on and listens for the first time, and randomly delays for the second time, and obtains an ID, and then broadcasts and sends the ID. The CAN node that successfully broadcasts the sending is set as its own ID, and then sends the own ID once every heartbeat time. The node that has not successfully sent will receive the ID message broadcast by the successfully sent CAN node, and think that the ID has been occupied, add 1 to the ID to form a new ID, terminate the previous transmission, and randomly delay the second For two hours, broadcast and send the new ID message again. And so on, until all CAN nodes have been assigned ID. The automatic networking method of the present invention is aimed at the application of multi-computer parallel connection and multiple nodes on the bus, and realizes ID allocation and dynamic increase and decrease of nodes through the automatic networking algorithm without any manual or external intervention.

Description

technical field [0001] The invention relates to the field of CAN bus technology, and in particular to a method for automatic networking of the CAN bus. Background technique [0002] CAN (Controller Area Network) bus is a serial digital communication bus originally designed for the control of automotive on-board equipment. cable routing. Due to the high reliability, refined protocol and low price of the CAN bus, it is also widely used in the field of industrial measurement and control. With the popularization of electric vehicles, the charging pile market is huge. In order to facilitate the connection with the battery management system BMS, the CAN bus has also become the mainstream communication method in charging pile products. [0003] Charging piles generally consist of several or dozens of charging modules connected in parallel to increase power, and communication power systems are usually composed of several switching power supply modules connected in parallel, and th...

AI Technical Summary

Problems solved by technology

[0005] 1) The starting node needs to be selected externally, which increases the difficulty of operation and is not fully automatic;

[0006] 2) The node ID is determined by a random number, which will cause discontinuity and increase the difficulty of host monitoring;

[0007] 3) The total number of network nodes N needs to be determined to determine the completion of the network, and the application occasions are limited; it is also impossible to dynamically increase or decrease the network nodes

[0009] 1) Each node, that is, a terminal device, must have a different characteristic ID, and the ID cannot be automatically assigned; only through networking to compete for the bus controller;

[0010] 2) The bus controller must maintain the node information table. If the bus controller exits, the network needs to be re-established. The new competitive bus controller maintains the node information table, which increases the difficulty of software development

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