8/12/2019 Vehicle Safety Systems

1/14

Welcome to Crash

8/12/2019 Vehicle Safety Systems

2/14

* Half million people are killed every year in the traffic accidents!!!

8/12/2019 Vehicle Safety Systems

3/14

8/12/2019 Vehicle Safety Systems

4/14

Seat Belt System

Reduces risk of fatal accidents by 45%

Rib and abdominal injuries may be suffered,especially if the seat belt is not correctly positioned.

Types

Two point seat belt

Three point seat belt

8/12/2019 Vehicle Safety Systems

5/14

Height adjusters

Improve the seat belts' protective effect by

achieving correct belt geometry.Increase the ease and the comfort of use for car

occupants of above or below average height.

8/12/2019 Vehicle Safety Systems

6/14

Buckle

Must withstand forces of at least two tons.

must be easy to open even when heavily loaded.

8/12/2019 Vehicle Safety Systems

7/14

Retractor

Two locking sensors that work independently.

Vehicle sensor detects sudden deceleration of the vehicle.Webbing sensor detects violent pull-outs of webbing from the

retractor.

8/12/2019 Vehicle Safety Systems

8/14

Pretensioners

Restrains an occupant as early as possible in a crash.

Reduce the load on the occupant in a violent crash.Tighten the belt during the very first fractions.

Reduce the risk of "submarining.

8/12/2019 Vehicle Safety Systems

9/14

Seat Belt Beam

(Ready to be installed in vehicle)

8/12/2019 Vehicle Safety Systems

10/14

Frontal air bags

Reduce the fatalities in head-on collisions by 25-30%.

8/12/2019 Vehicle Safety Systems

11/14

IMPACT---->>>SENSORS---->>>INFLATOR TRIGERRED

--->>>GAS GENERATED--->>>AIRBAG INFLATION--->>>

COVER SPLIT--->>>INFLATES IN FRONT OF OCCUPANT

--->>>DEFLATION

How does an airbag work?

8/12/2019 Vehicle Safety Systems

12/14

How does an airbag work? (Contd)

In a frontal impact of sufficient severity (comparable to a collision into a

solid wall at 10-14 MPH or above), sensors in the vehicle detect thesudden deceleration and trigger the inflator module. This causes the solid

chemical propellant sealed inside the inflator, principally sodium azide,

to undergo a rapid chemical reaction. This reaction produces primarily

nitrogen gas, the same gas that makes up 80 percent of the air we

breathe. The gas inflates a woven nylon bag packed inside the steering

wheel hub or the instrument panel for the front seat passenger. The bag

inflates in less than one-twentieth of a second, splitting open itsprotective cover, and inflating in front of the occupant. As the occupant

contacts the bag, the nitrogen gas is vented through openings in the back

of the bag, which helps to cushion forward movement.

8/12/2019 Vehicle Safety Systems

13/14

Sideimpact airbag

Side-impact collisions account for a quarter of all injuries to car

occupants.

Account for more than one third of the serious and fatal injuries.

8/12/2019 Vehicle Safety Systems

14/14