CAN (controller area network) bus communication method for reducing frame conflicts

A technology of CAN bus and communication method, which is applied in the direction of bus network and data exchange through path configuration, which can solve the problems of low CAN communication efficiency and poor real-time performance, reduce the number of frame collisions, simplify implementation, and improve real-time performance Effect

Inactive Publication Date: 2013-06-26
CHINA NORTH VEHICLE RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

By reducing the number of CAN frames, solve the problems of low CAN communication efficiency and poor real-time performance

Method used

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  • CAN (controller area network) bus communication method for reducing frame conflicts
  • CAN (controller area network) bus communication method for reducing frame conflicts

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Embodiment Construction

[0015] The present invention defines 1 or 2 bytes of data in a CAN frame as the index number, and then defines 1 or more bytes as the index data, the meaning of the index data depends on the index number, and the low-speed data that needs to be transmitted Fill in the corresponding index data, so that data of different rates can be defined in a data frame, the purpose of reducing data frames is obtained, frame collisions are avoided, and the effective data flow of communication and the real-time performance of network data are greatly improved, thereby Reduced chance of frame collisions.

[0016] The invention relates to a communication protocol for improving CAN efficiency and real-time performance. In a CAN frame, one or more data are used as index numbers, and one or more bytes are used as index data to realize synchronous transmission of data at different rates. Features. That is, the method of secondary indexing is used to embed low-speed data into high-speed CAN frames,...

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Abstract

The invention relates to a CAN (controller area network) bus communication method for reducing frame conflicts. Data with one or two bytes is defined in a high-frequency CAN frame to be used at an index number, one or multiple bytes are defined again to be served as index data, implication of the index data is defined by the index number, low-frequency data required transmission is filled in corresponding index data, and accordingly low-frequency data is embedded in the high-frequency CAN frame, synchronous transmission of data of different speed is achieved, and CAN frame conflicts are reduced.

Description

technical field [0001] The invention relates to a CAN bus communication method for reducing frame conflicts Background technique [0002] At present, CAN (Controller Area Network) communication is increasingly used in vehicle electronic control, industrial sites and other occasions. CAN communication solves the problems of multi-master communication handshake and arbitration. [0003] CAN communication is generally widely used in vehicle electronic control. The real-time performance of CAN communication is very important to the safety of vehicles. Adopting this scheme has a good effect on improving the safety of vehicles, so it has a broad application prospect. [0004] When CAN communication transmits a large amount of data and the frequency of communication is high, since the data sent by each CPU is random, some of them are multi-frame bursts, which will inevitably lead to aggravated frame collision, which will cause many frames to be lost, and communication failure, resu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/40
Inventor 钱锐凌云胡建军李杰李晴李耀伟陈旺张领辉苏瑾
Owner CHINA NORTH VEHICLE RES INST
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