没有合适的资源?快使用搜索试试~ 我知道了~
首页Experience_with_ISO_26262_ASIL_Decomposition.pdf
Experience_with_ISO_26262_ASIL_Decomposition.pdf
需积分: 10 154 浏览量
更新于2023-05-27
评论 1
收藏 1.66MB PDF 举报
本文档介绍了汽车功能安全标准ISO26262的相关基础知识和相关概念,尤其详细的介绍了如何进行ASIL等级的分解过程并且基于示例来进行解析
资源详情
资源评论
资源推荐

17 February 2011 Experience with ASIL Decomposition 1
Experience with ISO 26262
ASIL Decomposition
John Favaro
Consulting Division
Andrea Piovesan
Safety and Diagnostics Division
Automotive SPIN
Milano – 17 February 2011

17 February 2011 Experience with ASIL Decomposition 2
Automotive Safety Integrity Level
• The Automotive Safety Integrity Level
(ASIL) expresses the criticality
associated with a function of the system
• It defines the safety requirements that
must be fulfilled by the design and
development of the system in such a way
that, even in conditions of failure, the
system provides a sufficient margin of
safety for the users (driver, passengers,
road traffic participants, etc.)

17 February 2011 Experience with ASIL Decomposition 3
ASIL Basics
• The ASIL is not calculated for a physical system component - it is
calculated for a function
• THE ASIL associated with a function is then inherited by the
software and hardware elements that realize the function
• It could happen that a hardware component or a software element
realizes several functions with different ASILs (e.g. microcontroller)
• In this case, the ASIL associated with the hardware or software
component is inherited from the function with the highest ASIL
A HW/SW element inherits the ASIL from the highest
ASIL function running on it
Function 1 (ASIL x)
Function 2 (ASIL y)
Function 3 (ASIL z)

17 February 2011 Experience with ASIL Decomposition 4
Lowering the ASIL
• Under certain circumstances, the ASIL
can be lowered through the technique of
ASIL Decomposition
• The concept already existed in IEC 61508
– it is not entirely new!
• This can be advantageous – for example,
with respect to production costs
– It usually costs less (labor, time, tools) to
develop according to a lower ASIL
• But there are strict underlying concepts
and rules that must be respected
• Cost savings
• Time savings
• …

17 February 2011 Experience with ASIL Decomposition 5
Valid Combinations
Table of valid
combinations
for ASIL
decomposition
剩余26页未读,继续阅读












安全验证
文档复制为VIP权益,开通VIP直接复制

评论0