Case Study: Technical Safety Argumentation for a Fail-Tolerant EPS for Automated Driving

During the development of a steering system for Use Cases SAE L3 or L4 many architectural decisions must be made, especially in the context of preventing systematic faults. While the usage of a 2 channel steering system is currently non-controversial, the details of the 2 channel system can be various. Especially the question of the usage of homogenous redundant or diverse components in HW & SW must be well considered.

In the presentation it is described, how decisions are made, based on realistic faults and clever architectural adaptions and how these decisions are argued for the use in a safety case claiming fulfillment of ASIL – D safety goals regarding correctness and availability.

  • From Fail-Safe to Fail-Tolerant EPS (Electric Power Steering)
  • How to address systematic faults for automated driving?
  • List of realistic faults for software intensive systems
  • Decision making for fault prevention, fault prediction and fault tolerance for Fail-Tolerant EPS
  • Technical Safety Argumentation to Comply with Availability and Correctness Requirements for Highly Automated Driving

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