A Network Level Adaptive CAN Bus Fault Diagnosis Method

Abstract

The invention relates to a CAN bus fault diagnosis method, in particular to a network-level self-adaptive CAN bus fault diagnosis method NAFD. The invention is mainly applied to the automobile CAN network communication system, including model analysis and fault diagnosis methods. On the basis of the CAN bus topology model, a fault diagnosis model is established, and the nodes in the CAN network are divided into test nodes and measured nodes. The types are divided into: normal state, intermittent fault state, and permanent fault state. The faulty node is shut down after two diagnoses, which avoids misjudgment of the node state due to external factors and wastes node resources; at the same time, the cache content in each node It only includes the state of the corresponding node, reduces the amount of data in the network, and improves the performance of the network while improving the reliability of the CAN bus network.

Description

Technical field [0001] The present invention relates to a CAN bus fault diagnosis method, particularly a network-level adaptive CAN bus fault diagnosis method NAFD (AN NetWork-Level Adaptive Fault Diagnosis Method for Controlleranetwork). NAFD Dialects a batch fault and permanent failure between the network node. When the node has a permanent failure, it enters the bus to turn off state, thereby increasing the network reliability. Background technique [0002] The controller branch network CAN (Controller Area Network) is an international standardized serial communication protocol for automobiles, which is currently the standard protocol for automotive networks. Due to its high performance and reliability, it is also widely used in industrial automation, ships, medical equipment vehicles, and other industrial applications, and provides strong support for real-time and reliable data communication between the distributed control systems. [0003] The car node is the electronic cont...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing CAN bus fault diagnosis method cannot accurately judge the fault type of the node in the network and the problems such as large amount of data in the network and slow diagnosis speed during diagnosis, and proposes a network-level self-adaptive CAN The bus fault diagnosis method NAFD divides the nodes in the CAN network into test nodes and measured nodes, and uses the method of sequentially diagnosing the nodes to determine the fault type of the fault node; at the same time, the cache content in each node only contains the corresponding node The state of the network reduces the amount of data in the network, thereby improving network performance

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