Automobile flexray bus static segment message scheduling method

Abstract

The invention discloses a message dispatching method for the static segment of an automobile FlexRay bus, and proposes an integer linear programming model for solving message parameters. The weighted sum of is the optimization goal. It is required that the weighted sum of the total number of network allocated node frames and the node message jitter value be as small as possible. The repeated message sending period is less than or equal to the message repeated generation period, the node allocation frame number equation of the network static segment, and the node message jitter The value equation is the constraint condition, and the optimal message resending cycle is solved, and then the resending cycle and the allocated frames corresponding to all the messages of the nodes in the static segment of the FlexRay network are obtained, thereby providing an algorithm for the parameter configuration of the static segment of the network. The invention can not only improve the network bandwidth utilization rate, but also is suitable for the situation that the message repetition period is not synchronized with the FlexRay communication period.

Description

technical field [0001] The invention relates to the technical field of automobile bus network parameter configuration, in particular to a static segment message scheduling method of an automobile FlexRay bus. Background technique [0002] With the development of automotive electronic technology, the control of the body system is gradually changing to automation and intelligence, and the automotive electrical system is becoming increasingly complex. People's requirements for vehicle safety and comfort are getting higher and higher, which makes more and more electronic control systems applied to automobiles, and the data transmission volume on the vehicle bus also increases sharply, which also improves vehicle data. The original CAN bus communication protocol gradually fails to meet the requirements of interaction accuracy and transmission timing. [0003] Although the current research work has made a lot of achievements in the parameter design of the static segment of the Fl...

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Problems solved by technology

People's requirements for vehicle safety and comfort are getting higher and higher, which makes more and more electronic control systems applied to automobiles, and the data transmission volume on the vehicle bus also increases sharply, which also improves vehicle data. The original CAN bus communication protocol gradually fails to meet the requirements of interaction accuracy and transmission timing

[0003] Although the current research work has made a lot of achievements in the parameter design of the static segment of the FlexRay network and the optimal scheduling of messages, there are few comprehensive studies on improving the network bandwidth utilization, the number of frames allocated by messages, and message jitter.

In the case that the repetition period of the message is inconsistent with the communication period of FlexRay, the response time of the message is required to be less than or equal to its deadline and the message jitter is small, but the existing technology cannot achieve this effect

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