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📘 Before the cabin has visibly moved, accelerometers are already measuring the car's changing motion

Within the first fraction of a second after a crash begins, a car's exterior may look almost unchanged, but its sensors are already reporting a violent change in motion. Sensors measure the vehicle's acceleration and deceleration, while the

3
lessons
~15 min
to learn
Adults
level
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What you’ll learn

  1. Detecting the crashExplain how sensors and a restraint controller recognize crash motion and select a response.Accelerometers measure changing vehicle motion, and the restraint controller interprets its direction, severity, and timing before sending a deployment command.
  2. Making the cushionTrace how an electrical command becomes a shaped, rapidly expanding gas cushion.An igniter starts a propellant reaction inside the inflator. Gas, fabric, seams, vents, and mounting work together to produce a useful cushion in a narrow time window.
  3. Managing the occupant's motionShow how belts, pretensioners, airbags, and vehicle structure share occupant protection.The belt manages position and the airbag manages contact. Together with the vehicle structure, they turn a millisecond deployment into coordinated restraint.

Questions this course answers

What does the restraint control module primarily analyze before commanding an airbag?

The controller uses sensor measurements and the crash pattern to decide whether and how to deploy a restraint.

Put the main deployment events in the order they occur.

Sensing and decision precede the electrical trigger; the inflator then generates gas that unfolds the cushion.

Match each restraint part with the job it contributes.

The components divide the timing and force-management work instead of one part doing everything.

Explain in your own words why a seat belt and airbag are designed to work together.

The belt helps restrain and position the occupant, while the airbag cushions and spreads the load when the occupant meets it.

Grounded in trusted sources

  • National Highway Traffic Safety Administration, Vehicle Air Bags and Injury Prevention — https://www.nhtsa.gov/vehicle-safety/air-bags
  • National Highway Traffic Safety Administration, Advanced Air Bag Inflator and Crash Sensor Testing — https://www.nhtsa.gov/advanced-air-bag-inflator-and-crash-sensor-testing
  • National Highway Traffic Safety Administration, Inflators 101: What is an inflator and what is the problem? — https://www.nhtsa.gov/sites/nhtsa.gov/files/documents/ridella-inflators101-remarks.pdf
  • National Highway Traffic Safety Administration, Preliminary Evaluation of Advanced Air Bag Field Performance Using Event Data Recorders — https://www.nhtsa.gov/document/preliminary-evaluation-advanced-air-bag-field-performance-using-event-data-recorders
  • Insurance Institute for Highway Safety, Airbags — https://www.iihs.org/research-areas/airbags

Every Wunder lesson is built from real, reputable sources — never invented.

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