Method for quickly checking error frames of CAN bus of whole vehicle

Abstract

The invention discloses a method for quickly checking error frames of a CAN (Controller Area Network) bus of a whole vehicle. The method is characterized by comprising the following steps of: step 1, checking bus baud rate mismatch; step 2, checking fault-tolerant error frames; step 3, checking bit filling error frames; step 4, performing reverse connection troubleshooting on the single controller CAN_H and the single controller CAN_L; and step 5, checking bus ID conflicts. According to the method, the fault can be judged when an error is detected in any one of the steps 1-4, the whole process does not need to be completed, and the detection efficiency is high.

Description

technical field [0001] The invention relates to the technical field of automobile networks, in particular to a method for quickly checking error frames of a whole vehicle CAN bus. Background technique [0002] Due to the single function and simple structure of traditional automobiles, the number of CAN network nodes in the whole vehicle is small, the data flow of the bus interferes little with each other, and the fault diagnosis of the bus is relatively simple. Generally, a simple reverse process diagnosis scheme can be used for fault diagnosis, namely Faulty node troubleshooting method (pull out the controller connector). With the development of automotive entertainment, intelligence, and electrification, there are more and more nodes on a single CAN network, and the number of nodes has increased from 4-5 to more than 10. Each node interferes with each controller in the vehicle network. The number of factors increases, if the reverse fault node elimination method is also a...

AI Technical Summary

Problems solved by technology

With the development of automotive entertainment, intelligence, and electrification, there are more and more nodes on a single CAN network, and the number of nodes has increased from 4-5 to more than 10. Each node interferes with each controller in the vehicle network. The number of factors increases. If the reverse fault node elimination method is also used, not only the fault diagnosis time will be long, but also the cause of the CAN fault cannot be located.

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