Automotive Safety Systems Flashcards
7 cards from real CAE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Automotive Safety Systems flashcards as text
What is the key distinction between 'passive' and 'active' automotive safety systems?
Answer: Active systems prevent accidents; passive systems mitigate injury after a crash occurs
Active safety systems (e.g., ABS, ESC) intervene before or during a crash to help avoid it, while passive systems (e.g., airbags, seatbelts) reduce injury severity once a crash is unavoidable.
In a rollover event, which sensor modality is most critical for detecting rollover onset in a vehicle's safety system?
Answer: Lateral accelerometer and roll-rate gyroscope
Rollover detection relies on the combination of a lateral accelerometer and a roll-rate gyroscope to accurately identify the onset of a rollover and distinguish it from normal cornering.
What does 'pretensioner' technology in seatbelt systems accomplish during a crash?
Answer: Retracts the belt rapidly to remove slack and position the occupant optimally
Seatbelt pretensioners fire a pyrotechnic or electric actuator in milliseconds to retract belt slack, tightening the belt against the occupant before peak crash forces arrive.
Which FMVSS regulation specifically addresses occupant crash protection requirements, including airbag performance standards?
Answer: FMVSS 208
FMVSS 208 (Occupant Crash Protection) establishes requirements for restraint systems including airbags and seatbelts, covering deployment thresholds, out-of-position occupant protection, and injury criteria limits.
What is the purpose of a 'load limiter' incorporated into modern seatbelt retractors?
Answer: Allow controlled belt payout to limit peak chest loading during restraint
Load limiters allow the seatbelt to pay out a small amount when chest loading exceeds a threshold, reducing the peak force transferred to the ribcage while still limiting forward excursion.
In Autonomous Emergency Braking (AEB) systems, which sensor fusion approach offers the best performance in adverse weather conditions?
Answer: Fusion of radar and camera data
Radar-camera fusion combines radar's robustness in rain and fog with camera's ability to classify objects and read lane markings, providing more reliable AEB performance than either sensor alone.
According to NCAP protocols, what test speed is used for the standard frontal offset deformable barrier (FOBD) crash test?
Answer: 56 km/h
The standard NCAP frontal offset deformable barrier test is conducted at 56 km/h (approximately 35 mph) with 40% overlap, targeting the driver's side of the vehicle.