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CAN (controller area network) communication equipment and method for dynamic synchronization

A CAN communication and dynamic technology, applied in the field of CAN communication, can solve the problems of poor real-time performance and low communication efficiency, and achieve the effect of reducing the number of frame collisions, improving real-time performance and increasing data flow.

Inactive Publication Date: 2013-03-13
CHINA NORTH VEHICLE RES INST
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Problems solved by technology

[0005] The purpose of the present invention is to allow each independent CPU to send in a unified order by establishing a quasi-synchronous principle, thereby reducing the possibility of conflicts, avoiding the situation where each CPU sends out of order, avoiding frame collisions, and greatly improving communication efficiency. Effective data flow and real-time performance of network data, so as to solve the problems of low CAN communication efficiency and poor real-time performance

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  • CAN (controller area network) communication equipment and method for dynamic synchronization

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Embodiment Construction

[0011] In order to make the purpose, content, and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0012] In order to overcome the frame conflict problem in the existing CAN communication, the present invention proposes a quasi-synchronous method, adopts the CAN multi-master communication mode to establish a synchronization mechanism, and then allows the CPUs participating in the communication to send data respectively in a certain order, thereby avoiding disorderly transmission. The frame collision greatly reduces the frame collision and increases the data volume of CAN communication. The invention is very effective in improving the real-time performance of CAN communication efficiency in the vehicle electric control system.

[0013] If the main timing CPU fails, other CPUs can continue to communicate autonomously ...

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Abstract

The invention relates to CAN (controller area network) communication equipment for dynamic synchronization. The CAN communication equipment comprises a main CPU (central processing unit) and a plurality of auxiliary CPUs, wherein the main CPU is used for transmitting data according to a certain time interval, the auxiliary CPUs are synchronized with the main CPU and used for starting to transmit data a period of lag time t after the main CPU transmits data; and the time is shorter than the time interval of transmitting data of the main CPU, and the lag time t of each auxiliary CPU is different.

Description

technical field [0001] The invention relates to a CAN (controller local area network) communication method, in particular to a dynamic synchronous CAN communication device and method, through which a quasi-synchronous communication result can be realized. Background technique [0002] At present, CAN communication is widely 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 ine...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/40H04J3/06
Inventor 凌云钱锐李春艳刘春生康忠胡建军李杰陈旺李耀伟李晴张领辉苏瑾
Owner CHINA NORTH VEHICLE RES INST
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