Functional safety concept design for EMB brake-by-wire system based on vehicle dynamic

doi:10.3969/j.issn.1674-8484.2024.06.004

Abstract

Abstract:

A functional safety concept design was conducted for smart vehicles with electronic mechanical braking (EMB) system to improve its safety and robustness. A fault injection simulation method was employed based on the ISO 26262 and combined with the product development status, to obtain the vehicle dynamic characteristics during EMB faulting, which provided the data for the assessment on severity and controllability, and effectively solved the problem of insufficient database in EMB system. The quantified severity and controllability were defined. The hazard analysis and risk assessment (HARA) were carried out, and 10 safety goals and their corresponding automotive safety integrity levels (ASIL) were achieved. The functional safety architecture and requirements of EMB system were developed with the functional safety concept design of the system being completed. Therefore, the concept analysis method can provide references for the functional safety development of other new intelligent driving electronic systems.

Key words: smart vehicles, electronic mechanical brake (EMB), functional safety, automotive safety integrity level (ASIL), concept design

CLC Number:

U462.3+3

DI Yage, ZHOU Jian, LU Jie, QIN Jia, WEI Yuqin, WANG Congjin, HAO Zhaoyang, MIAO Xuelong. Functional safety concept design for EMB brake-by-wire system based on vehicle dynamic[J]. Journal of Automotive Safety and Energy, 2024, 15(6): 830-838.

Figures/Tables 17

References 16

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功能失效分类	功能失效模式	整车危害
系统无需求时有功能输出	运行中，驾驶员没有踩制动踏板但非预期制动	车辆非预期减速及车辆失去稳定性
系统无需求时有功能输出	静止时，驾驶员没有踩制动踏板但非预期制动	车辆无法移动
系统无需求时有功能输出	运行中，驾驶员踩制动踏板但无制动力	车辆减速度过小
系统无需求时有功能输出	静止时，驾驶员踩制动踏板但无制动力	溜车
功能输出少于系统需求	运行中，驾驶员踩制动踏板，有制动力但低于预期	车辆减速度过小
功能输出少于系统需求	静止时，驾驶员踩制动踏板，有制动力但低于预期	溜车
功能输出大于系统需求	运行中，驾驶员踩制动踏板，有制动力但高于预期	车辆加速度过大
功能输出大于系统需求	静止时，驾驶员踩制动踏板，有制动力但低于预期	符合预期，无危害

功能失效分类	功能失效模式	整车危害
系统无需求时有功能输出	运行中，驾驶员没有踩制动踏板但非预期制动	车辆非预期减速及车辆失去稳定性
系统无需求时有功能输出	静止时，驾驶员没有踩制动踏板但非预期制动	车辆无法移动
系统无需求时有功能输出	运行中，驾驶员踩制动踏板但无制动力	车辆减速度过小
系统无需求时有功能输出	静止时，驾驶员踩制动踏板但无制动力	溜车
功能输出少于系统需求	运行中，驾驶员踩制动踏板，有制动力但低于预期	车辆减速度过小
功能输出少于系统需求	静止时，驾驶员踩制动踏板，有制动力但低于预期	溜车
功能输出大于系统需求	运行中，驾驶员踩制动踏板，有制动力但高于预期	车辆加速度过大
功能输出大于系统需求	静止时，驾驶员踩制动踏板，有制动力但低于预期	符合预期，无危害

严重度 S	暴露率 E	可控性C
严重度 S	暴露率 E	C0	C1	C2	C3
S0	E1	QM	QM	QM	QM
	E2	QM	QM	QM	QM
	E3	QM	QM	QM	QM
	E4	QM	QM	QM	A
S1	E1	QM	QM	QM	QM
	E2	QM	QM	QM	QM
	E3	QM	QM	QM	A
	E4	QM	QM	A	B
S2	E1	QM	QM	QM	QM
	E2	QM	QM	QM	A
	E3	QM	QM	A	B
	E4	QM	A	B	C
S3	E1	QM	QM	QM	A
	E2	QM	QM	A	B
	E3	QM	A	B	C
	E4	A	B	C	D

严重度 S	暴露率 E	可控性C
严重度 S	暴露率 E	C0	C1	C2	C3
S0	E1	QM	QM	QM	QM
	E2	QM	QM	QM	QM
	E3	QM	QM	QM	QM
	E4	QM	QM	QM	A
S1	E1	QM	QM	QM	QM
	E2	QM	QM	QM	QM
	E3	QM	QM	QM	A
	E4	QM	QM	A	B
S2	E1	QM	QM	QM	QM
	E2	QM	QM	QM	A
	E3	QM	QM	A	B
	E4	QM	A	B	C
S3	E1	QM	QM	QM	A
	E2	QM	QM	A	B
	E3	QM	A	B	C
	E4	A	B	C	D

严重度 S	v / (km·h^-1)
严重度 S	车与车正碰	车与车侧碰	车与人碰
S0	0~10	0~2	0~4
S1	10~20	2~8	4~20
S2	20~40	8~16	20~30
S3	>40	>16	>30