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Dual-redundancy CAN bus fault detection method

A CAN bus and fault detection technology, applied in the direction of bus network, data exchange through path configuration, digital transmission system, etc., can solve the problem of no dual redundant CAN bus network fault detection, and achieve reliable detection results and easy error detection. Effortless effort, simple implementation

Active Publication Date: 2014-01-01
BEIJING INST OF SPACE LAUNCH TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the prior art, there is no effective way for the fault detection of the dual redundant CAN bus network of the simultaneous sending and receiving technology

Method used

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  • Dual-redundancy CAN bus fault detection method
  • Dual-redundancy CAN bus fault detection method
  • Dual-redundancy CAN bus fault detection method

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Embodiment Construction

[0028] Such as Figure 1-2 As shown, depicts a schematic diagram of the structure of the dual-redundant CAN bus network and the expansion of the CAN interface according to an embodiment of the present invention.

[0029] In hardware, the dual redundant CAN bus uses two CAN buses, two CAN bus drivers, two CAN bus controllers and one CPU at the same time. CPU controls two CAN controllers simultaneously through different ports and interrupts.

[0030] In a preferred embodiment, the adopted dual redundant CAN buses BUS A and BUS B require the use of the same two sets of CAN devices, so as to realize the isolation of physical media. The CAN device of BUS A includes an independent bus cable, bus driver 1-2 and bus controller 1-1, and the CAN device of BUS B includes an independent bus cable, bus driver 2-2 and bus controller 2-1. CPU1 is realized by FPGA.

[0031] During the working process, the same group of data can be sent through the two buses BUS A and BUS B when sending; th...

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Abstract

The invention provides a dual-redundancy CAN bus fault detection method which aims to solve the problem that an effective method for fault detection of a dual-redundancy CAN bus network based on sending and receiving synchronization is unavailable currently. According to the dual-redundancy CAN bus fault detection method, both channels of a CAN bus serve as working channels, data are sent and received on the two channels at the same time, nodes on the two channels are defaulted to slave nodes, and nodes needing to start channel detection on the two channels set themselves as master nodes. The method comprises the steps that the master nodes send detection signals to the slave signals on the two channels respectively, the slave nodes receive the detection signals sent by the master nodes from one of the two channels and then send feedback signals of the slave nodes on the channel, and the master nodes receive the feedback signals from the two channels respectively and carry out fault identification on the two channels according to the received feedback signals. The dual-redundancy CAN bus fault detection method has the advantages of being simple in implementation, reliable in detection result, and capable of finding out the fault of each of the two channels fast.

Description

technical field [0001] The invention relates to a line fault detection method, in particular to a double redundant CAN bus fault detection method. Background technique [0002] The CAN bus has two frame types: standard frame and extended frame. The standard frame uses an 11-bit identifier, and the extended frame uses a 29-bit identifier. The frame type of the dual redundant CAN bus network can be a standard frame or an extended frame. The data frame of CAN bus is mainly composed of arbitration field, control field and data field. The arbitration field is composed of CAN message identifiers, which are used to characterize the function of the message. For example, the CAN message identifier of the channel detection frame is used to indicate that the data frame is a channel detection frame, and at the same time it plays an arbitration role for CAN communication. The data field carries CAN message data. [0003] When applying the traditional single CAN bus control network, so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/26H04L12/40
Inventor 李向阳李荣王小军张洪彬孙招凤许进亮
Owner BEIJING INST OF SPACE LAUNCH TECH