Method for monitoring running state of network node in network structure of CAN

Abstract

The invention provides a method for monitoring the running state of a network node in the network structure of a CAN (Control Area Network). The method comprises the following steps: a network management node periodically sends a clock message to at least one network node of one or more network nodes, and calculates the number of data frames received from each network node of at least one network node in each period of time; at least one network node calculates the number of data frames sent to a power network bus by the network node per se in each period of time according to the clock message sent by the network management node, and at least one network node sends the sent data frame number to the network management node; the network management node receives the sent data frame number, and utilizes the sent data frame number and the received data frame number to calculate the frame loss rate of each network node in at least one network node within at least one period of time; and the network management node judges the running state of each network node in at least one network node according to the frame loss rate.

Description

technical field [0001] The invention relates to a network monitoring method of an automobile control local area network (CAN) network, and in particular to a method for monitoring the running states of network nodes in the CAN network. Background technique [0002] CAN is a serial data communication bus developed by German Bosch in 1986 to solve the data exchange between many measurement and control components in automobiles. Up to now, today's CAN network system has played an irreplaceable role in the automobile industry. role. [0003] For rechargeable dual-mode hybrid electric vehicles, there are many electronic control modules and complex network communication. The vehicle CAN communication network is divided into power network and body network, which requires high reliability. Most of the existing CAN networks do not have active monitoring functions, and cannot detect bus node failures and abnormal network performance in time. It may have little impact on network struc...

AI Technical Summary

Problems solved by technology

Most of the existing CAN networks do not have active monitoring functions, and cannot detect bus node failures and abnormal network performance in time. It may have little impact on network structures with simple general functions, less system interaction, and low reliability requirements, but For the complex network structure of hybrid electric vehicles and the network with large data volume and high reliability requirements, there are great risks, so that the real-time monitoring of the operating status of all modules cannot be guaranteed, so a new CAN network monitoring is required The method is used to monitor the status of the entire network in real time, so that the operating status of each module and component of the entire vehicle can be instantly known, and the harm caused by system failure can be avoided to the greatest extent.

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