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Fundamentals of functional safety

Fundamentals of functional safety

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Although we live much safer than our uncivilised ancestors, technical products carry new risks into our lives. There would be no progress without taking risks, but risks must be limited to a tolerable order of magnitude. At first sight, it might look cynic to compare risks to human lives with costs to prevent them or to quantify these risks by true or ideal costs; indeed, it is not an easy job to find the legally and ethically right way. Laws depend on the country, and there are cultural differences in ethical considerations. In this chapter, we will learn the basic ideas about functional safety, we will get to know important standards such as ISO 26262 [132] ... [141] and see how much this topic is related to EMC under any possible working conditions. Functional safety is an issue comprising hardware and software, so it is worth to have a look also at software-related practices in order to see if we can learn something for hardware development and in particular for EMC. It should be mentioned that systems profit from simplicity, so increasing complexity of systems tends to impair EMC and functional safety. Besides product complexity, a development which is increasingly distributed over several departments or companies is a challenge. We will see that a systematic approach to functional safety can also improve product quality.

Chapter Contents:

  • 3.1 Goals and definitions
  • 3.2 Management
  • 3.2.1 Functional safety life cycle
  • 3.2.2 Safety goals
  • 3.2.3 Cooperation of OEMs and suppliers
  • 3.3 Analysis
  • 3.3.1 Dependent failure analysis
  • 3.3.2 Fault tree analysis
  • 3.3.3 Failure mode and effect analysis
  • 3.3.4 Design review based on failure mode
  • 3.3.5 Event tree analysis
  • 3.3.6 Markov chain
  • 3.3.7 Hazard and risk assessment
  • 3.4 Software development
  • 3.4.1 Process models
  • 3.4.2 Development assessments
  • 3.4.3 Configuration management
  • 3.4.4 Modularisation
  • 3.5 Hardware development
  • 3.5.1 Reliability
  • 3.5.2 Reliability block diagrams and redundancy
  • 3.6 Functional safety and EMC
  • 3.7 Functional safety and quality
  • 3.8 Standards
  • 3.8.1 History
  • 3.8.2 ISO 26262
  • 3.8.2.1 Vocabulary
  • 3.8.2.2 Management of functional safety
  • 3.8.2.3 Development initiation and overview
  • 3.8.2.4 System development part I: preparing software and hardware development
  • 3.8.2.5 Hardware development
  • 3.8.2.6 Software development
  • 3.8.2.7 System development part II: from software and hardware development to the release
  • 3.8.2.8 Production
  • 3.8.2.9 Operation
  • 3.8.2.10 Supporting processes
  • 3.8.2.11 ASIL-oriented analysis
  • 3.8.2.12 Guideline
  • 3.8.2.13 Second release
  • 3.8.3 ISO/PAS19451
  • 3.8.4 ISO/PAS19695
  • 3.8.5 ISO 25119
  • 3.9 Functional safety of autonomous vehicles

Inspec keywords: ethical aspects; automotive engineering; ISO standards; product quality; safety

Other keywords: functional safety; working conditions; hardware development; ethical consideration; EMC; software-related practice; cultural differences; product quality

Subjects: Maintenance and reliability; Inspection and quality control; Civil and mechanical engineering computing; Mechanical engineering applications of IT; Design; Health and safety aspects; Automobile industry; Economic, social and political aspects of computing

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