基于FlexRay总线的静态段带宽利用率研究

doi:10.16180/j.cnki.issn1007-7820.2019.06.003

Abstract

Abstract:

In order to improve the bandwidth utilization ratio of the Flexray network, this study analyzed the static segment parameters of Flexray and the length of the message in transmission. To reduce the bandwidth waste resulting from the great difference between mathematical model and static message length, the optimization function of MATLAB and the method of dividing the long messages into two messages of the same length were proposed respectively. This paper illustrated the problem of converting mathematical model of static segment in Flexray network to nonlinear programming.The proposed distribution methods considered the effect of increasing useless bits in the coding process on the entire network. Numerical experiments showed that this method could be further improved based on theoretical maximum utilization of bandwidth.

Key words: FlexRay bus, static segment, bandwidth utilization, message segmentation, optimization function, message encoding

CLC Number:

TP393

ZHANG Yugui,HU Xuechen,WANG Yi. Research about Bandwidth Utilization of Static Segment Based on FlexRay Bus[J].Electronic Science and Technology, 2019, 32(6): 12-16.

Figures/Tables 5

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References 16

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实例	最优负载数据长度x_opt			优化中被分割长度
实例	优化前	理论最优	优化后	优化中被分割长度
实例1	16	4	8	16、11
实例2	26	10	8	26
实例3	48	16	12	48、46
实例4	84	16	12	80
实例5	70	16	10	70、70
实例6	50	18	20	40

实例	带宽利用率U
实例	优化前	理论最优	优化后
实例1	0.118 2	0.199 8	0.220 2
实例2	0.070 8	0.215 5	0.224 6
实例3	0.079 1	0.256 0	0.308 3
实例4	0.058 0	0.329 5	0.334 8
实例5	0.032 9	0.285 4	0.304 5
实例6	0.232 1	0.358 9	0.377 3

Research about Bandwidth Utilization of Static Segment Based on FlexRay Bus

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