Functional Safety in Automotive Electronics & Software

March 3, 2021

WHAT IS FUNCTIONAL SAFETY?

Functional Safety (FuSa) standard ISO 26262 is adopted from IEC 61508. It is applicable to Embedded Systems, E/E, (Electronics and Software) in the Automotive industry. The first edition was released in 2011 and mainly focused on passenger cars, which can be up to 3500Kg. The second edition was released in 2019, which was updated with trucks, buses and bikes. There’s also a separate chapter added for semiconductors.

In an organization scope, more importance is given to the following in Functional Safety:

  • Establishing safety culture according to organization structure in electronics
  • Improving the vehicle knowledge according to new Kautex technology and new standards

why is fusa needed? 

As new technologies and more electronics are added into the vehicle, there are many dependencies among electronics on one another. Because of this, if any electronics fail, it will lead to catastrophic situations and create more damage than we can imagine or anticipate. FuSa helps in avoiding critical hazard scenarios or situations. The following is a list of the types of analyses used in different level or phases:

  • Vehicle Level: Hazard Analysis and Risk Assessment (HARA)
  • System Level: Failure Mode Effects Analysis (FMEA), Fault Tree Analysis (FTA), Design Failure Mode Effects Analysis (DFMEA)
  • Hardware Level: FMEA, Failure Modes, Effects and Diagnostic Analysis (FMEDA)
  • Software Level: FMEA, Dependent Failure Analysis (DFA), Freedom from interference (FFI),Common Cause Failures, Cascading Failures
  • Production: Process Failure Mode Effects Analysis (PFMEA)

In FuSa, we have two types of safety: Active Safety (helps you drive safely) and Passive Safety (protects you in a crash). In our Rhapsody system, we use Active Safety. Based on the criticality and impact of the system on the vehicle (HARA), the Automotive Safety Integrity Level (ASIL) is defined: ASIL A is the lowest and ASIL D is the highest.

Example:

  • ASIL A: Power Window
  • ASIL B: Head Lamps
  • ASIL C: Braking System
  • ASIL D: ADAS (level 3 and up)

what is the difference between aspice & fusa? 

ASPICE:

Automotive SPICE is a process-based model developed by Automotive SIG (Special Interest Group). It is used for performing and assessing software development in automotive domain. Implementation of ASPICE leads to better processes and better product quality. It also enables the cooperation among complex supply chains and between development and engineering centers.

FuSa:

FuSa addresses the needs for an automotive-specific international standard that focuses on safety critical components. ISO 26262 is intended to be applied to safety-related systems that include one or more E/E systems and that are installed in series production passenger cars. ISO26262 addresses possible hazards caused by malfunctioning behavior of E/E safety-related systems, including interaction of these systems.

what is kautex doing for fusa?

Chart - functional safety in a circle surrounded by 6 words: Quality, Production, Sales, Supply Chain, Legal, Engineering

FuSa needs to integrate and adapt to all the functions as shown. Engineering and Production are the most important to start with. So, we started with FuSa process using eFLP (stages). We are using the Safety Element out of Context (SEooC) in developing Rhapsody Fuel System. Simultaneously, we have started trainings for engineering teams supporting Vision 2025 with Smart Products.