Browse Publications Technical Papers 2008-01-0117
2008-04-14

Functional Safety of an Embedded Automotive System Measured by Fault Tree Birnbaum Importance – Applied for a Steering Angle Sensor with Intrinsic Redundancy 2008-01-0117

Functional safety, required e.g. by IEC 61508 [1], encounters rising recognition in the development of automotive electronic systems. Sufficient protection against safety-critical faults has to be approved. Guidelines for corresponding metrics exist but apply either for parallel redundant architectures or for on-board diagnosis. But in automotive embedded systems, often hybrid solutions are implemented.
In this context, the determination of safety metrics may be obstructed using the conventional methods. The underlying FMEA cannot treat failure combinations with sufficient stringency.
An alternative approach, based on Fault Tree Analysis (FTA) is described. A new safety metric was developed using the Birnbaum Importance and is called Protection against Fault Propagation (PFP). It considers both fault diagnosis, and redundancy.
It was applied for the embedded steering angle sensor system from Valeo. The results provide the necessary arguments for functional safety of this system.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Hazard Analysis and Risk Assessment for Complex EE-Architectures

2010-01-0029

View Details

TECHNICAL PAPER

Applying Functional Safety Management and SPICE for Automotive Functions

2008-01-0109

View Details

TECHNICAL PAPER

Safety Critical Software Development for a Brake By-Wire System

2006-01-1672

View Details

X