CAN bus safety monitoring method

Abstract

In order to reduce complexity and improve robustness of a safety monitoring system based on a CAN bus, the invention provides a CAN bus safety monitoring method comprising the steps that a plurality of monitoring devices are arranged on the CAN bus, wherein the monitoring devices are not connected with the CAN bus; a plurality of data transceivers are arranged at connection positions of the monitoring devices and the CAN bus, wherein the data transceivers are all connected with the CAN bus; each monitoring device is connected with one of the closest data transceivers; one data transceiver is set as a main node, and the other data transceivers are set as slave nodes; the main node sends detection information to the slave nodes, wherein the detection information comprises first obligate fields and second obligate fields; the slave nodes send feedback information to the main node after the slave nodes receive main node signals; and the main node receives the feedback information sent by each slave node. According to the method of the invention, balancing of requirements of the sensor and the interface of the CAN bus is avoided, the structure of the CAN bus safety monitoring system is simplified, and cost is reduced.

Description

technical field [0001] The invention relates to a line fault detection method, more specifically, to a CAN bus safety monitoring method. Background technique [0002] Controller Area Network CAN (ControllerArea Net) is a field bus, mainly used for various process detection and control. CAN was originally designed by the German BOSCH company for vehicle monitoring and control. At present, CAN has been gradually applied to other industrial controls and has become the ISO-11898 international standard. [0003] The CAN bus has the following characteristics: [0004] 1) CAN can be a peer-to-peer structure, that is, a multi-host working mode. Any node on the network can actively send information to other nodes on the network at any time, regardless of master and slave, and the communication method is flexible. [0005] 2) Nodes on the CAN network can be divided into different priorities to meet different real-time needs. [0006] 3) CAN adopts non-destructive arbitration techno...

AI Technical Summary

Problems solved by technology

[0010] When using the traditional single CAN bus to monitor the power line or power line network, sometimes there will be some failure links, such as main line or branch line failure, drive circuit failure, etc., resulting in network transmission failure

In addition, the monitoring equipment on the CAN bus needs to bind the monitored information to the information of a certain location attribute and send it to the CAN bus, which causes the complexity of the communication protocol

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