Airbag FINAL

8/7/2019 Airbag FINAL

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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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Airbag FINAL

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