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Part3. Concept phase - Coggle Diagram
Part3. Concept phase
3-6 Hazard analysis and risk assessment_D1P133
Frequency of accident due to failure without safety measures. The item without internal safety mechanisms
Maximum acceptable probility of an event causing a fatality
PMHF of the safety system (failure rate)
1~3. Failure rate=Maxim asseptable of accident/ Failure rate of the unprotected process_D1P143
ASIL C <10^(-7)Xh^(-1)
ASIL B <10^(-6)Xh^(-1)
ASIL D <10^(-8)Xh^(-1)
Situation analysis when it is incorrectly used in a foreseeable way
ASIL Determination_D1P173
Exposure_D1P160
E2: <1% of average operation time
E2: 1% to 10% of average operation time
E3: >10% of average operation time
E1: not specified
Exposure for T&B (truck, buses, trailers)
Controllability_D1P166
C1: >99% are able avoid harm
C1: >90% are able avoid harm
C0: controllable in general
C3: <90% are able avoid harm
Severity_D1P156
S1: more than 10% probability of AIS 1-6 damage
S2: more than 10% probability of AIS 3-6 damage
S0: AIS0& less than 10% probability of AIS 1-6 damage
S3: more than 10% probability of AIS 5-6 damage
Determination of ASIL Severity+Exposure+Controllability
ASIL A sum of parameters number=8
ASIL A sum of parameters number=9
ASIL A sum of parameters number=7
ASIL A sum of parameters number=10
Safety Goal
The ASIL determined for the hazardous event shall be assigned to the corresponding safety goal
Verification
Consistency with related hazard analysis and risk assessments
Completeness of the coverage of the hazardous events
Compliance with the Item definition
Consistency of the assigned ASILs with corressponding hazardous events
Completeness Safety goal with regard to situation and hazard
3-5 Item definition_D1P129
Results from test vehicles& Results of pre-trails
Documentation from predecessor items& Determined boundries and interfaces
Relevant patents& Relevant information on other items
Know Failure modes and Hazards
Product idea, Project sketches& Potential consequences
Functional Requirements, Functionality, Environment, Laws/ regulations
3-7 Functional safety concept_D1P192
Verification of the functional safety concept
Allocation of function safety requirements
Derviation of function safety requirements
safe states
emergency operation time interval
fault tolerant time interval
functional redundancies for foult tolerance
operation modes
Safety goal
Validation criteria
its consistency and compliance with the safety goals
its ability to mitigate the hazardous events