ADAS功能安全-ASIL Rating.pdf

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ASIL Rating Introduction & Analysis Functional Safety - ISO 26262: 2011 Functional Safety* absence of unreasonable risk due to hazards caused by malfunctioning behavior of E/E systems  The complete product life cycle is addressed  system-description  hazard analysis  system development  HW- and SW-development  production  service  decommissioning

ASIL Rating Introduction & Analysis Functional Safety - ISO 26262: 2011 Concept Phase Development Phase Start of Production and Operation System development HW & SW development Functional Safety Management Activities Functional Safety Management concerns all engineering phases!

ASIL Rating Introduction & Analysis Rear-end collision happens Severity Exposure Controllability Hazard: “too high or unintended brake torque”

ASIL Rating Introduction & Analysis Introduction of severity classification AIS0 no injuries AIS1 Light injuries AIS2 moderate injuries AIS3 severe but not life- threatening injuries AIS4 AIS5 severe injuries (life- threatening, survival probable) critical injuries (life-threatening, survival uncertain) AIS6 extremely critical or fatal injuries Abbreviated Injury Scale AIS Severity skin-deep wounds(皮肤擦伤） up to 15 minutes of unconsciousness（短暂失去意识） Skull fractures without brain injury（骨折） concussion with or without skull fractures with up to 12 hours of unconsciousness （颅骨受伤导致的长时间昏迷） more than 12 hours of unconsciousness including intracranial bleeding (12小时以上昏迷且颅内出血） as fractures of the cervical vertebrae above the third cervical vertebra with damage to the spinal cord （致命伤害）

ASIL Rating Introduction & Analysis Introduction of severity classification S0 Damage that cannot be classified safety-related S1 More than 10 % probability of AIS 1-6 (and not S2 or S3) S2 More than 10 % probability of AIS 3-6 (and not S3) S3 More than 10 % probability of AIS 5-6

ASIL Rating Introduction & Analysis Introduction of Exposure classification

ASIL Rating Introduction & Analysis Introduction of Exposure classification Duration (% of average operating time) Not specified <1 % 1 % to 10 % >10 % E1 E2 E3 E4 Road layout Highway entrance ramp One-way street (city street) One-way street (city street) Highway Road surface Nearby elements obstacle in lane of travel (highway) Vehicle stationary state In repair garage (on roller rig) Manoeuvre Driving downhill with engine off (mountain pass) Snow and ice on road Nearing end of congestion (highway) In repair garage (during diagnosis or repair) Driving in reverse (city street) Wet road Traffic congestion Vehicle on a hill (hill hold) Heavy traffic (stop and go) Visibility Unlighted roads at night Accelerating Decelerating Executing a turn (steering) Parking (parking lot) Lane change (city street) Stopping at traffic light (city street) Lane change (highway)

ASIL Rating Introduction & Analysis Introduction of Controllability classification Controllable in general 99 % or more of all drivers or other traffic participants are usually able to avoid harm 90 % or more of all drivers or other traffic participants are usually able to avoid harm Less than 90 % of all drivers or other traffic participants are usually able, or barely able, to avoid harm Driving factors and scenarios C0 C1 C2 C3 Warning message - gas low Maintain intended driving path Faulty adjustment of seat position while driving Failure of ABS during emergency brakingents Failure of ABS when braking on low friction road surface while executing a turn Faulty driver airbag release when travelling at high speed Brake to slow/stop vehicle Maintain intended driving path Maintain intended driving path, stay in lane -Maintain intended driving path, stay in lane -Brake to slow/stop vehicle

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