Communication type wire harness troubleshooting method based on bus physical topology

Abstract

The invention discloses a communication wire harness troubleshooting method based on bus physical topology. The method comprises the steps: connecting a CAN bus in a test interface through bus equipment, and collecting the online condition of each controller; forming a bus physical topological graph based on the wire harness drawing; and in combination with the online condition of each controller and a bus physical topological graph, the fault range is narrowed, the troubleshooting direction is determined, and the fault position is finally found. According to the bus physical topology special drawing which is formed through redesign and used for troubleshooting the controller wire harness fault, and in combination with the online condition of each controller, the fault troubleshooting range is effectively reduced, the troubleshooting direction is determined, and the fault position can be quickly locked.

Description

technical field [0001] The invention belongs to the technical field of fault detection of vehicle communication systems, and in particular relates to a method for troubleshooting a communication harness fault based on the physical topology of a bus. Background technique [0002] With the continuous development of electronic technology and the continuous increase of vehicle functions, the number of controllers on vehicles is also increasing. At present, most of the controllers on the vehicle realize data communication through CAN bus connection. When one or some controllers fail to communicate, it is necessary to quickly find out the cause of the failure. [0003] In addition to the failure of the controller itself, it is usually related to the wiring harness. There are usually two types of wiring harness-related faults: 1. Power supply / ground failure; 2. CAN loop failure. Among them, the troubleshooting of power supply / grounding failures is relatively simple and will not ...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, in the process of checking the cause and location of the failure of the CAN loop, it is necessary to check the disconnection / short circuit / terminal contact of the CAN bus branch / trunk of each communication failure controller based on the existing vehicle wiring harness drawing, Realize the open circuit and short circuit inspection of the CAN circuit, the investigation efficiency is very low and a lot of coverings may need to be removed, which cannot meet the requirements of quickly identifying the cause of the fault, which is not conducive to the rapid solution of the problem;

[0005] In addition, the existing vehicle wiring harness drawing is based on CAN bus network topology requirements and the actual position of the controller, through the branches of the CAN bus, the CAN transceivers of each controller are connected to the backbone of the CAN bus one by one to form a CAN bus physical network , the wiring harness drawing contains all the information of the vehicle wiring harness, the position distribution and mutual relationship of the relevant controllers are not intuitive, and it takes a lot of time to extract effective information from it, which further reduces the efficiency of troubleshooting

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