Fault detection system and method for bus to cyclically send fault codes of controller

Abstract

The invention belongs to the technical field of automobile bus automatic diagnosis and relates to a fault detection system and method for a bus to cyclically send fault codes of a controller, and mainly aims to cyclically send the fault codes. The system comprises a fault detection module and a fault sending module. The system is characterized in that the fault detection module is used for detecting fault states of all fault nodes of the controller; the fault sending module is used for sending fault information of all fault nodes of the controller to a serial bus according to a detection result of the fault detection module; and the duration of occupying the bus by the fault information of fault nodes with the faults is longer than the duration of occupying the bus by the fault information of fault nodes without faults. According to the method and the device, the fault codes are circularly sent, the problem that the network load is too large when multiple pieces of fault information are sent is solved, and the time of sending the fault information of the fault nodes occupying the serial bus is longer than the time of sending the fault information of the fault nodes without the faults.

Description

technical field [0001] The invention relates to the technical field of automatic diagnosis of automobile bus, in particular to a fault detection system and method for cyclically sending controller fault codes by the bus, which is mainly used for cyclically sending fault codes. Background technique [0002] The automatic diagnosis of the faults of each part of the car can timely feedback whether the functions of the car can work normally, which greatly improves the safety of the car during use, and the automatic diagnosis is carried out in the form of sending fault codes through the CAN bus. The patent document whose publication number is CN106814731A discloses a vehicle fault code reading method, device and vehicle fault statistics system, which can read the fault state flag signal of the vehicle electronic controller in real time; wherein, the fault state flag signal is the vehicle electronic controller The internal self-defined signal is used to mark whether there is a fau...

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Problems solved by technology

However, in this way, after diagnosing one fault, the current fault code will continue to be sent as 1 on the bus, and if multiple faults are diagnosed, the bus cannot send two fault codes at the same time because the network load will increase, which will cause Select the most serious fault code among multiple faults to send. This diagnosis method is not conducive to finding all the faults at the moment in the fastest time. It is necessary to solve the fault codes in order according to the severity, which is not conducive to the analysis of faults and reduces the workload. efficiency

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