CAN bus fault-tolerant design method

Abstract

The invention discloses a CAN (Controller Area Network) bus fault-tolerant design method, which comprises the following steps of: firstly, expanding redundant CAN bus channels among all communication nodes of an application system based on a standard CAN bus; then, on the basis that a 29-bit extended frame ID is stipulated by a CAN2.0 protocol, the lowest two bits of the frame ID are defined as message channel identifiers of redundant CAN bus channels; at a data sending node and a data receiving node, a multi-channel-based data parallel sending mechanism and a multi-channel effective data detection mechanism are respectively adopted to ensure fault-tolerant transmission of data. Due to the adoption of a multi-redundancy transmission channel and a multi-channel-based data parallel transmission and effective data detection mechanism, when a transmission error occurs in a packet of messages on one channel, a receiver can detect the message error through a data verification mechanism and discard the error message; and meanwhile, the same message can be received from other backup channels and reported to an application layer, and a sender does not need to send the message again, so that real-time fault tolerance of accidental data errors can be realized.

Description

technical field [0001] The invention belongs to the technical field of avionics design, and in particular relates to a CAN bus fault-tolerant design method. Background technique [0002] At present, CAN bus is mostly used among avionics equipment to complete simple data transmission between equipment or internal hardware modules of equipment. However, the standard CAN bus protocol only stipulates the physical layer and data link layer protocol of a single bus, and only has the ability to detect data errors on a single bus, and does not have the ability to transmit real-time data fault-tolerant and physical line fault-tolerant. [0003] The on-board aircraft of avionics equipment works in complex environments such as high temperature, low temperature, electromagnetic interference, etc., and has high requirements for the reliability of data transmission. The standard CAN bus design cannot meet the application of high reliability real-time data transmission of avionics equipmen...

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Problems solved by technology

However, the standard CAN bus protocol only stipulates the physical layer and data link layer protocol of a single bus, and only has the ability to detect data errors on a single bus, and does not have real-time data fault-tolerant transmission and physical line fault-tolerant capabilities.

[0003] The on-board aircraft of avionics equipment works in complex environments such as high temperature, low temperature, electromagnetic interference, etc., and has high requirements for the reliability of data transmission. The standard CAN bus design cannot meet the application of high reliability real-time data transmission of avionics equipment Require

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