Method for scheduling message at static segment of automobile FlexRay bus

Abstract

The invention discloses a method for scheduling a message at the static segment of an automobile FlexRay bus and proposes an integral linear programming problem model for solving message parameters. As for a given FlexRay network system, the model takes the weighted sum of the frame number of node allocation and jitter values of node messages as an optimization objective and requests that the smaller the weighted sum of the frame number of network allocation nodes and the jitter values of the node messages, the better, the optimal repeated message sending cycle is solved under the constraint condition of the repeated message sending cycle smaller than or equal to the repeated message generation cycle, a network static segment node allocation frame number equation and a node message jitter value equation, repeated sending cycles corresponding to all messages of the FlexRay network static segment and allocated frames are further obtained, and an algorithm is provided for parameter configuration of the network static segment. The network bandwidth utilization rate can be increased, and the method is applicable to the non-synchronous conditions of the repeated message cycles and the FlexRay communication cycle.

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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