CAN communication bus system-based fault diagnosis method

Abstract

The invention belongs to the automobile control technical field and provides a CAN communication bus system-based fault diagnosis method. The method includes the following steps that: a vehicle is started; a vehicle controller receives the messages of various components circularly; the vehicle controller judges whether the vehicle itself receives the messages of each component; if the vehicle controller does not receive the messages of each component, the vehicle controller judges whether itself receives the message of a certain component in a preset time period; and if the vehicle controller does not receive the message of the component in the preset time period, the vehicle controller judges a fault code corresponding to the component and transmits the fault code to an instrument, and the instrument displays corresponding fault information. With the CAN communication bus system-based fault diagnosis method of the invention, a CAN communication bus system is protected; the fault of the CAN communication bus system can be judged; judgment on whether each component of the vehicle malfunctions can be facilitated; and measures against the fault are taken, so that the safety of the driving of the vehicle can be ensured.

Description

technical field [0001] The invention relates to the technical field of automobile control, in particular to a fault diagnosis method based on a CAN communication bus system. Background technique [0002] With the advent of the era of automotive electronics, most of the controllers of the hybrid power system, such as the engine, motor controller, vehicle controller, and battery management system, rely on the CAN communication bus system for communication. Whether the CAN communication signal of the entire vehicle is stable or not is a matter of It is a key factor that directly affects whether the car can run normally. As a serial communication network that effectively supports distributed control or real-time control, the CAN communication bus system is widely used in the field of automotive communication. The use of this bus reduces the number of wiring harnesses and realizes high-speed transmission of a large amount of data. However, the CAN communication bus system also h...

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Problems solved by technology

However, the CAN communication bus system also has many disadvantages in terms of communication signals. There is no traditional switch signal, the analog signal is so stable, and it is seriously interfered. Moreover, the CAN communication bus system is relatively unfamiliar to maintenance personnel, and maintenance personnel cannot accurately identify CAN communication. failure, increasing the difficulty of maintenance

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