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Machines rule the world,
We rule the machines..
No hardware no software
Without a gear..
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SAFETY AIRBAGS IN CARS
PRESENTED BY:PRAVEEN.S
1GC06ME085
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OUTLINE
1 INTRODUCTION
2 BASIS OF AIR BAGS
3 DEVELOPMENTS OF AIR BAGS
4 CONSTRUCTION OF AIR BAGS
5 WORKING6 MODERN TYPES
7 FUTURE
8 AIR BAG DEPLOYMENT
9 AIR BAG CHECKS
10 DISARMING AIR BAGS11 CONCLUSION
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INTRODUCTION
Airbags are able to save the passengersfrom any serious injuries when crashoccurs.
The attraction of a soft pillow to landagainst in a crash must be very strong.
Airbags have been under developmentfor many years.
Statistics reveal that airbags reduce therisk of casualty in a DFC by 30%.
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Newtons second law of motion.
If objects arent restrained they willcontinue moving at the speed of the
moving car even if the car is stopped bya collision.
What all airbags need to do is to slow
down the passengers speed to zero.
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DEVELOPMENT
The first patent on an inflatable crashlanding device for airplanes was filedduring WORLD WAR-2
In 1980 first commercial airbagsappeared in automobiles.
Ever since 1988 it became a binding.
Efforts to adapt the airbag wasstranded due to prohibitive prices andtechnical hurdles.
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MAINPARTSOFANAIRBAG
Bag
Sensor
Inflation system
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BAGS
Is made up of a thin nylon fabric, which isfolded into the steering wheel or dashboardor the seat or door.
The powdery substance released
(cornstarch or talcum powder) is used tokeep the bags lubricated while theyre instorage.
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SENSOR
A device that tells the bag to inflate.
It works with the control module to
discriminate between crash and non- crashevents.
Inflation happens when there is a collisionforce equal to running into a brick wall at 16
to 24 Km per hour.
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INFLATIONSYSTEM
NaN3+KNO3=large amts. of NITROGENGAS.
Hot Blasts of the nitrogen inflate theairbag from its storage site up to
322 Kmph.
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CONSTRUCTION OF AIR BAGS
Airbag are assemblies consisting ofthe airbag (made of Nylon), inflatormodules, sensor housing, electricalconnectors (Clock spring), airbagretainer and the cover.
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Inflator assembly
Control module activates airbagassembly- electric current is sent to thedetonator-ignition of sodium azide
pallets-evolves nitrogen gas.
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WORKING
Air bags are designed to inflate in frontalimpacts in which the car strikes about 16 km/hr
After collision sensors sends an electric currentto igniter system
Electric current heats the filament which ignitesthe capsule which in turn ignites the gasgenerating pallets
The gas expands quickly and inflation of air bags
there by takes place, which break through aplastic cover in the steering wheel
Time taken for all these things about 0.1 sec.
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MODERN TYPES
Curtain airbags Developed by mercedes and volvo
Inflate infront of windows to providepassengers better head and neckprotection
More efficient at tipping and side impacts Reduce HIC by 80%
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Contd..
Head-thorax bag Developed by ford and renault.
High protection to head.ITS
Worlds first airbag for head protection
Developed by BMW.
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FUTURES OF AIRBAGS
Smart systems Includes weight sensors
Determine type occupant in seat.
i.e. child or adult.
Infrared occupant detection Detect the distance of passenger from
airbags
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Contd..
Capacitive reflective occupantsensing
Identify distance passenger from dash
board Discriminate between human occupant
and inanimate objects
Updated sensor Deploys seatbelt pretensioners faster to
get benefit of airbags
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AIR BAG DEPLOYMENT
Airbag inflation
Coming to rest in seat and deflation ofairbag
All these take in 30 milliseconds
In fact the entire inflation/deflationcycle takes less than sec.
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AIRBAG CHECKS
When we turn key look at the dash tofind airbag light for 7-10 sec & then goout
Problems occur when Light does not come on
If light does not go off after period
If light comes during driving
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Air bag warning labels(on visor and other locations)
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For detailed information on the
switch and when to use see the
Vehicle Owners Manual
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DISARMINGAIRBAGS
Disconnect battery
Wait 30sec.
Remove airbag fuse
Drop sound insulator panel
Disconnect the circuits
Thus the bag is disarmed
Keep the bag below 130degree Celsius
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What will they think of next?
Pedestrian Protection with air bags?
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Not just for cars!
GL 1800 GoldwingGL 1800 Goldwing
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CONCLUSIONS
Air bags are of greater importance intoday's vehicles since safety of humanlife is of prior importance
So far safe riding and for saving theprecious life the safety bags must beimplemented
Lets hope every automobile
manufacturer implements the same
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