1. Chandra pal Singh Shekhawat
VtU 6641
Mechanical Department

2. AIRBAGS: A Safety Restraint
System of an automobile

3. INTRODUCTION
Seat belts provided the sole form of safety in
cars.
Airbags were developed.
A soft pillow to land against in a crash.
They are gas-inflated cushions.
The first patent on an inflatable crash landing
device was filed during World War II.
Airbags are the subject of serious scientific
research and tests.

4. MAIN PARTS OF AN AIRBAG
 Bag
Made of thin nylon fabric,folded into a steering wheel
or dashboard or more recently the door or seat.
 Sensor
Tells the bag to inflate
 Inflation system
The rapid pulse of hot nitrogen gas to inflate the bag.

5. 2 NaN3 → 2 Na + 3 N2 (g)
10 Na + 2 KNO3 → K2O + 5 Na2O + N2 (g)
K2O + Na2O + 2 SiO2 → K2O3Si + Na2O3Si (silicate glass)

6. This is how it takes place..

7. MECHANICAL CRASH SENSORS
• CRASH SENSOR WITH DAMPING
BALL IN-TUBE SENSOR
THE AIRFLOW GENEARTES AN AERODYNAMIC DRAG FORCE THAT DAMPENS THE
BALL MOTION.

8. • SPRING MASS SENSOR
ROLOMITE SENSOR
Roller- suspended with a tensioned baned.
Substantial collision- roller overcomes a spring force and rotates forward.
Impact-moving contact of the metallic band touches a fixed contact and
closes a circuit.
Parameters- distance of trigger
- magnitude of the spring.

9. Future of airbags
 Smart Restraint Systems
Adapts its geometry, performance or behavior
to suit various impacts and occupant position.
Includes weight sensors.
Determine type of occupant in the seat. i.e
child or adult.
Detect the distance of passenger from airbags.

11. Airbag checks
Turn the key and look at the dashboard to find
the airbag light on for 7-10 sec. & then it goes
off.
Problems occur when
•
•
•
1. Light does not come on.
2. If light does not go off after the period.
3. If light comes while driving.

12. THANK YOU