Automotive Functional Safety Compliance Requirements with ISO 26262: HW Architectural Metrics with an Example
The newly released automotive safety standard ISO 26262 entitled ‘Road vehicles—Functional Safety’ gives the guidelines to demonstrate safety compliance of a product design. The standard describes the safety implementation process considering the total pr
- PDF / 332,065 Bytes
- 12 Pages / 439.37 x 666.142 pts Page_size
- 22 Downloads / 175 Views
Abstract The newly released automotive safety standard ISO 26262 entitled ‘Road vehicles—Functional Safety’ gives the guidelines to demonstrate safety compliance of a product design. The standard describes the safety implementation process considering the total product life cycle. Based on the hazard and risk analysis carried out on the functionality of an item, the functional safety requirements are derived. For each of these functional safety requirements the technical safety requirements are specified with respect to Hardware and Software design. The standard has several requirements in order to prove the safety compliance with respect to Hardware and software design. In this paper one of the requirements in the hardware design which is known as HW Architectural metrics and Probabilistic Metric for random Hardware Failures is discussed. This is a quantitative assessment of a design with respect to technical safety requirements. The merits of each of these calculations are demonstrated using a simple example of a solenoid valve driver control circuit. The paper also discusses certain challenges in carrying out these analyses. Keywords Hardware safety compliance SPFM-LPFM
Hardware architectural Metrics
ISO 26262
F2012-F09-009 T. Chitra (&) Consultant Mahindra Satyam, Bangalore, India
SAE-China and FISITA (eds.), Proceedings of the FISITA 2012 World Automotive Congress, Lecture Notes in Electrical Engineering 197, DOI: 10.1007/978-3-642-33805-2_62, Springer-Verlag Berlin Heidelberg 2013
769
770
T. Chitra
1 Introduction Safety turns out to be one of the most important issues of present day automobile development. The whole challenge is how we ascertain that the safety related electrical/electronic systems are adequately designed to avoid systematic and random failures. The newly introduced automotive safety standard ISO 26262 provides the necessary guidelines to design a product with adequate safety. The standard has ten parts. Each part addresses the requirements with respect to different aspects of product life cycle. In order to carry out the safety analysis of any product the first and foremost activity is to carry out the hazard analysis of the function and to identify the risks associated with them. The objective of the hazard analysis is to identify and categorize those malfunctions of the item and formulate the safety goals related to the prevention or mitigation of the hazardous events in order to avoid unreasonable risk. Safety goals are top-level safety requirements for the item. The safety goals guide in deriving the functional safety requirements required in avoiding the unreasonable risk associated with the hazardous event. The safety goals are expressed in terms of functional objectives. The risk associated with the hazards is measured qualitatively by Automotive Safety Integrity Level (ASIL). There are four levels of the ASIL namely ASIL A, ASIL B, ASILC, ASILD where ASIL A is the lowest safety integrity level and ASIL D the highest one. The ASILs are determined based on the sever
Data Loading...
