Browse Publications Technical Papers 2018-01-0793
2018-04-03

Calculating Probability Metric for Random Hardware Failures (PMHF) in the New Version of ISO 26262 Functional Safety - Methodology and Case Studies 2018-01-0793

The Automotive Functional Safety standard ISO 26262 introduced a PMHF (Probabilistic Metric for random Hardware Failures) in Part 5 and Part 10 by calculating the system failure rates and assessing the ASIL (Automotive Safety and Integrity Level) for functional safety. The new version of the standard expands the PMHF concept by further promoting a new metric “average probability of failure per hour over the operational lifetime of the item”, which has not been commonly used by the reliability engineering community. In order to clarify how PMHF is calculated within the content of ISO 26262, this paper will discuss how to calculate both the failure rate and the average probability of failure per hour in terms of definitions, sources of the data, applications, and advantages and disadvantages. It will also present examples of calculating PMHF including the average probability of failure per hour for a non-exponentially distributed failure population as well as an example of a system with redundancy.

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

Calculating System Failure Rates Using Field Return Data. Application of SAE-J3083 for Functional Safety and Beyond

2018-01-1074

View Details

TECHNICAL PAPER

Authentication and Secure Communication for In-Vehicle Networks

2005-01-1533

View Details

TECHNICAL PAPER

On the Timing Analysis at Automotive Real-Time Embedded Systems

2017-01-1618

View Details

X