Research on Optimization of Network Resource Utilization in Static Segment of FlexRay Bus

doi:10.16182/j.issn1004731x.joss.20-0836

Abstract

Abstract:

In order to improve the utilization of the network resources of the FlexRay bus, the network is optimized for static segment scheduling. The FlexRay communication mechanism is analyzed, the message model is established and the calculation method of bandwidth loss is derived, while considering the protocol overhead and network idling, taking the number of static frames and the length of the static frame payload as design variables, the overall optimal packaging scheme is obtained by solving this multi-objective optimization problem. This solution is finally applied to the vehicle chassis integrated control system for simulation analysis and verification. The results show that the solution has a greater improvement in the utilization of network resources.

Key words: FlexRay, bandwidth loss, network idling, protocol overhead, scheduling

CLC Number:

TP336

Xinhang He, Erkang Li, Hongchao Zhang. Research on Optimization of Network Resource Utilization in Static Segment of FlexRay Bus[J]. Journal of System Simulation, 2022, 34(3): 564-572.

Figures/Tables 11

Fig. 1

Fig. 2

Table 1

Fig. 3

Fig. 4

Fig. 5

Table 2

Fig. 6

Fig. 7

Table 3

Table 4

Signal packaging solution

节点名称	周期/ms	信号数据组合
ESC	4	$S 11 + S 21 + S 31 + S 41$
ACC	6	$S 12 + S 22$
GW	16	$S 13 + S 63$
	8	$S 23 + S 33 + S 73$
	8	$S 83 + S 93 + S 103$
	8	$S 43 + S 53 + S 113$
EPS	6	$S 14 + S 24$
CDC	8	$S 15$
ASC	12	$S 16$

Table 4

References 12

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参数	数值	单位
TSS	9	Bit/帧
FSS	1	Bit/帧
FES	2	Bit/帧
BSS	2	Bit/byte
CID	11	Bit/帧
T_APO	1	MT/帧
T_MT	1	μs

节点名称	信号名称	周期/ ms	长度/ byte
电子稳定控制系统(ESC)	ESC_Status	4	6
	ESC_WheelRot	4	8
	ESC_WheelSpeed	4	4
	ESC_DampReq	4	4
自适应巡航系统(ACC)	ACC_Status	6	10
自适应巡航系统(ACC)	ACC_EMSReq	6	8
网关(GW)	GW_Status	16	20
	EMS_AirConStatus	8	8
	EMS_Status	8	8
	EMS_IdleSpeed	8	6
	EMS_AccpeDaRos	8	9
	EMS_Temp	16	3
	EMS_Torq	16	8
	TCU_Status	16	8
	TCU_Temp	8	8
	TCU_TurSpeed	8	9
	TCU_TorqReq	8	5
电动助力转向系统(EPS)	EPS_Status	6	18
电动助力转向系统(EPS)	EPS_StrAng	6	5
连续减震控制系统(CDC)	CDC_Status	8	8
空气悬架系统(ASC)	ASC_Status	12	4

关键点	有效数据长度	静态帧数目	网络空载	协议开销	带宽损失
网络空载最低	33	8	1 432	736	2 168
协议开销最低	25	9	1 467	424	1 891
带宽损失最低	25	9	1 467	424	1 891

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