safety airbags in carsmub

8/8/2019 Safety Airbags in Carsmub

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SAFETYSAFETY

AIRBAGS INAIRBAGS IN

CARSCARS


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SAFETY AIR BAGS IN CARSSAFETY AIR BAGS IN CARS

No safety device has consumed more attention andNo safety device has consumed more attention andresources than the airbag. It is known with high confidenceresources than the airbag. It is known with high confidencethat when a crash occurs, the presence of airbag reducesthat when a crash occurs, the presence of airbag reducesfatality risk to drivers.fatality risk to drivers.

Airbags are subject of serious government and industryAirbags are subject of serious government and industryResearch.Research.

My seminar takes you to the history, development andMy seminar takes you to the history, development andworking aspects of airbag.working aspects of airbag.


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HISTORY OF AIRBAGHISTORY OF AIRBAG

For years, the trusty seat beltFor years, the trusty seat belt

provided the sole form ofprovided the sole form ofpassive restraint in our cars.passive restraint in our cars.

But over time, much of theBut over time, much of thecountry adopted mandatorycountry adopted mandatoryseatseat--belt laws.belt laws.

There were debated aboutThere were debated abouttheir safety, especiallytheir safety, especiallyrelating to children.relating to children.

Statistics have shown thatStatistics have shown thatthe use of seat belts hasthe use of seat belts hassaved thousands of lives thatsaved thousands of lives thatmight have been lost inmight have been lost incollisions.collisions.


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Air Bags have been under development for many years.Air Bags have been under development for many years.

The attraction of a soft pillow to land against in a crash mustThe attraction of a soft pillow to land against in a crash mustbe very strongbe very strong the first patent on an inflatable crashthe first patent on an inflatable crash--landing device for airplanes was filed during World War II.landing device for airplanes was filed during World War II.

In the 1980s the first commercial air bags appeared inIn the 1980s the first commercial air bags appeared inautomobiles.automobiles.

Since 1988, all new cars have been required to have air bagsSince 1988, all new cars have been required to have air bagson both driver and passenger sides (Light Trucks came underon both driver and passenger sides (Light Trucks came underthe rule in 1999).the rule in 1999).

To date, Statistics show that air bags reduce the risk of dyingTo date, Statistics show that air bags reduce the risk of dyingin a direct frontal crash by 30 percent.in a direct frontal crash by 30 percent.

air bags are the subject of serious government and industryair bags are the subject of serious government and industryresearch and tests.research and tests.


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DEPLOYMENT OF AIR BAGDEPLOYMENT OF AIR BAG

Stopping an objects momentum requires force acting over aStopping an objects momentum requires force acting over aperiod of time.period of time.

When a car crashes, the force required to stop an object isWhen a car crashes, the force required to stop an object isvery great because the cars momentum has changedvery great because the cars momentum has changedinstantly while the passengers has not much time to workinstantly while the passengers has not much time to workwith.with.

The goal of any supplemental restraint system is to help stopThe goal of any supplemental restraint system is to help stopthe passenger while doing as little damage to him or her asthe passenger while doing as little damage to him or her aspossible.possible.


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What an air bag wants to do is to slow theWhat an air bag wants to do is to slow thepassengers speed to zero with little or nopassengers speed to zero with little or nodamage.damage.

The air bag has the space between the passengerThe air bag has the space between the passengerand the steering wheel or dashboard and aand the steering wheel or dashboard and afraction of a second to work with.fraction of a second to work with.

It gives a halt to the driver, and stops him toIt gives a halt to the driver, and stops him tocollide with dash or other parts.collide with dash or other parts.


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CONSTRUCTION OF AIR BAGCONSTRUCTION OF AIR BAG

Airbag are assemblies consistingAirbag are assemblies consistingof the bag (made of Nylon),of the bag (made of Nylon),inflator modules and sensorinflator modules and sensorhousing, electrical connectors,housing, electrical connectors,airbag retainer and the cover.airbag retainer and the cover.

The drivers side bag is mountedThe drivers side bag is mountedin the centre of the steeringin the centre of the steering

wheel.wheel. By function, there are 2 types ofBy function, there are 2 types of

sensorssensors -- Impact sensors andImpact sensors andsaving sensors.saving sensors.

An inflator which assembles whenAn inflator which assembles whenthe control Module activates thethe control Module activates theairbag assembly, an electricairbag assembly, an electric

current is sent to the detonator,current is sent to the detonator,which ignites the sodiumwhich ignites the sodium azideazidepellets.pellets.

When it burns, it releases nitrogenWhen it burns, it releases nitrogengas very quickly and in largegas very quickly and in largequantities.quantities.

This is what inflates the airbag.This is what inflates the airbag.


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WORKING OF AIR BAGWORKING OF AIR BAG Air Bags are designed to inflate in frontal or frontalAir Bags are designed to inflate in frontal or frontal--angleangleimpacts in which the car strikes an immovable object atimpacts in which the car strikes an immovable object at

more than about 16 Kilometres per hour or another car atmore than about 16 Kilometres per hour or another car attwice that speed.twice that speed.

After a collision, sensors sense an electric current to anAfter a collision, sensors sense an electric current to an

ignite system or, in some cases, to the computerizedignite system or, in some cases, to the computerizedcontrol unit.control unit.

The electric current heats a filament (wire), which thenThe electric current heats a filament (wire), which thenignites a capsule.ignites a capsule.

The Ignited capsule supplies the heat to ignite GasThe Ignited capsule supplies the heat to ignite Gas--generating pellets.generating pellets.


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The gas then expands quickly and inflates the airbag, whichThe gas then expands quickly and inflates the airbag, whichthen breaks through a plastic cover in the steering wheelthen breaks through a plastic cover in the steering wheelor, the dashboard on the passenger side.or, the dashboard on the passenger side.

The whole process takes about 0.1 second from the exactThe whole process takes about 0.1 second from the exactmoment the crash is detected.moment the crash is detected.

The air bag starts to deflate immediately, venting theThe air bag starts to deflate immediately, venting the

harmless gas through holes in the back of the bag of theharmless gas through holes in the back of the bag of thethrough the fabric itself.through the fabric itself.


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AIR BAG CHECKSAIR BAG CHECKS

When you get in your vehicle and turn the key, look at theWhen you get in your vehicle and turn the key, look at the

dash to find your airbag or SRS light.dash to find your airbag or SRS light.

It should come on for 7It should come on for 7--10 seconds and then go out. This10 seconds and then go out. Thistells you all is well with the airbag system.tells you all is well with the airbag system.

if the light does not come on, have it checked. After all, itif the light does not come on, have it checked. After all, itcould just be a burnt out Light bulbcould just be a burnt out Light bulb

if the light does not go off after this period (usually 7if the light does not go off after this period (usually 7--1010seconds) There is a problemseconds) There is a problem

If the Light comes on while you are driving, it also needsIf the Light comes on while you are driving, it also needsattention.attention.


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CONCLUSIONCONCLUSION

The air bags are of greater importance inThe air bags are of greater importance in

todays vehicles since safety of human lifetodays vehicles since safety of human lifeis of prior importance. Since the count ofis of prior importance. Since the count ofautomobiles is increasing tremendously onautomobiles is increasing tremendously onour roads, the probability of accidents isour roads, the probability of accidents is

also more. So far a safe riding and foralso more. So far a safe riding and forsaving the precious life the safety bagssaving the precious life the safety bagsmust be implemented. Today it is prevailmust be implemented. Today it is prevailthe age of the high class people who ownthe age of the high class people who ownhigh priced cars. Lets hope everyhigh priced cars. Lets hope everyautomobile manufacturer implement theautomobile manufacturer implement thesame since safety for life is inevitable.same since safety for life is inevitable.


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Always drive safely, becauseAlways drive safely, because

someone is waiting for you.someone is waiting for you.

safety airbags in carsmub

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