Vehicle fault diagnosis method and system

Abstract

The invention discloses a vehicle fault diagnosis method comprising the steps that fault phenomenon information of a vehicle is acquired; fault part information corresponding to the fault phenomenon information is taken out of a fault phenomenon model library; all data interception is performed on the vehicle so that a data message corresponding to the fault part information is acquired, and the state parameter corresponding to each fault part is acquired from the data message; and the fault parts are located according to each fault part and the state parameter corresponding to each fault part by using a part fault parameter model library. According to the method, the vehicle fault can be more comprehensively and accurately diagnosed. The invention also discloses a vehicle fault diagnosis system.

Description

technical field [0001] The invention relates to the field of vehicle fault diagnosis, in particular to a method and system for vehicle fault diagnosis. Background technique [0002] With the wide application of network technology, especially the bus technology in vehicles, the vehicle fault diagnosis method based on the bus is also widely used. At present, the vehicle fault diagnosis method based on the bus mainly obtains the fault message of the bus data through the vehicle bus. Locate the faulty component according to the fault message. As we all know, the fault message of the vehicle bus is based on the SAE J1939 application layer protocol, which defines 12 types of fault messages. Although 524,288 faulty components can be identified, there are only 32 fault modes. In some cases, the component is within its specified normal value range, but the component is in a fault state at this time. In this case, the current bus-based vehicle fault diagnosis method cannot diagnose ...

AI Technical Summary

Problems solved by technology

As we all know, the fault messages of the vehicle bus are based on the SAE J1939 application layer protocol, which defines 12 types of fault messages. Although 524,288 faulty components can be identified, there are only 32 fault modes. In some cases, the component is within its specified normal value range, but the component is in a fault state at this time

In this case, the current bus-based vehicle fault diagnosis method cannot diagnose its fault information.

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