CAN communication fault diagnosis method

Abstract

The invention relates to a CAN communication fault diagnosis method which comprises the following steps: performing system initialization; judging a first type of faults, quitting in case of the firsttype of faults, or else executing a next step; establishing a fault diagnosis enabling condition module; judging a second type of faults if the first type of faults do not happen and an enabling state En is equal to 1. Through the steps, the first type of faults, that is, completely interrupted communication, and the second type of faults, that is, alternatively connected and interpreted communication, can be recognized, then corresponding fault disposal can be taken directly if the first type of faults happen, in addition, the second type of faults can be judged when the first type of faultsdo not happen, fault priorities are classified, repeated judgment can be avoided, the diagnosis efficiency is greatly improved, and convenience can be brought to later fault checking.

Description

technical field [0001] The invention relates to the technical field of communication fault diagnosis, in particular to a CAN communication fault diagnosis method. Background technique [0002] CAN communication failure is a relatively common failure in the CAN bus. For controllers communicating through the CAN network, this failure will cause the controller to receive wrong data or lose data, thereby affecting the judgment of the controller, and may even It will cause serious safety accidents. For the electric vehicle controlled by CAN network, the fault diagnosis can be used in many places, so the module can be built into a standard diagnostic library through MATLAB, and then use the automatic code generation technology to generate functions. In the later use, by modifying some calibration parameters, the diagnosis of CAN network faults of different software can be realized. At present, the commonly used fault diagnosis method is to judge whether there is a communication ...

AI Technical Summary

Problems solved by technology

There are many deficiencies in this diagnostic method: First, in the case of different software running cycles and message sending times, there will be misalignment of judgment time, and then there will be misjudgment; Divide and judge them in general, and the function is not clear, which increases the difficulty of later troubleshooting

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