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Method for improving network utilization rate of FlexRay bus

A bus network and utilization technology, applied in the field of computer communication, can solve the problems of low network utilization, uncontrollable message scheduling, difficult to meet the high bandwidth and wire control of in-vehicle network, etc., to improve flexibility and save time slot occupation. Effect

Pending Publication Date: 2020-11-13
TIANJIN QISUO PRECISION ELECTROMECHANICAL TECH
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  • Claims
  • Application Information

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Problems solved by technology

As an event-driven bus, CAN lacks a time synchronization mechanism, uncontrollable message scheduling, and low network utilization. It is difficult to meet the needs of high-bandwidth and wire-controlled vehicle networks.

Method used

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  • Method for improving network utilization rate of FlexRay bus
  • Method for improving network utilization rate of FlexRay bus
  • Method for improving network utilization rate of FlexRay bus

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Experimental program
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Embodiment Construction

[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0036] The invention is based on figure 1 The shown FlexRay bus network is realized, the FlexRay bus network passive bus type topology, and adopts dual-channel mode. From figure 1 As can be seen in , the FlexRay module connects all FlexRay nodes together through channel A and channel B.

[0037] A method for improving the network utilization rate of the FlexRay bus, comprising the following steps:

[0038] Step 1. Abstractly represent the static segment communication structure of the FlexRay bus network.

[0039] The FlexRay static segment uses the time-triggered time-division multiple access media access mechanism to communicate periodically. Its basic unit is a static frame, which consists of three parts: frame header, payload segment, and frame tail, and occupies the bus in this order. Static time slots for transmission. The length of the frame header...

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Abstract

The invention relates to a method for improving the network utilization rate of a FlexRay bus. The method comprises the following steps: abstractly representing a static segment communication structure; establishing a static segment optimization model according to the abstractly expressed static segment communication structure; and finally, solving the static segment optimization model to obtain the minimum number of the required frame IDs, and optimizing the network utilization rate of the FlexRay bus according to the minimum number of the required frame IDs, wherein the static periodic scheduling table is a periodic time-triggered progress table. In order to flexibly configure the message scheduling table, the number of time slots required by messages in the message scheduling table is minimum, and more idle time slots are stored for expansion. The frame ID multiplexing can save unnecessary time slot occupation, and therefore the frame ID multiplexing is of great significance to a message scheduling strategy. According to the method, unnecessary time slot occupation is saved by reducing the number of the frame IDs, the flexibility of the static scheduling table is improved, and the network utilization rate of the FlexRay bus is improved while the broadband is saved.

Description

technical field [0001] The invention belongs to the field of computer communication, in particular to a method for improving the network utilization rate of a FlexRay bus. Background technique [0002] In the current vehicle network, the CAN bus has good scalability, high reliability and good error detection ability, and has always been in a dominant position in the vehicle network system. As an event-driven bus, CAN lacks a time synchronization mechanism, uncontrollable message scheduling, and low network utilization. It is difficult to meet the needs of high-bandwidth and wire-controlled vehicle networks. FlexRay is a bus communication technology based on time division multiple access (TDMA) and flexible time division multiple access (FTDMA). Its high speed, determinism, fault tolerance and flexibility can meet the needs of future automotive wire control technology. Widely recognized as the next generation in-vehicle networking protocol. [0003] Due to the characteristi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/40H04L12/24H04L12/26H04L1/00
CPCH04L1/0007H04L1/0083H04L12/40H04L41/145H04L43/0852H04L2012/40241
Inventor 赵连云王朝斌王剑
Owner TIANJIN QISUO PRECISION ELECTROMECHANICAL TECH
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