12/14/2012

1

AUTOMOBILE SAFETY

&

SECURITY

In addition to Telematics based Services like

• Digital Satellite Radio

• In car E-mail

• GPS systems

Recent Advancement in Braking Technology have led to

• Shorter stopping distance

•I ncreased Control in PANIC situation

• More control on CURVED turns

12/14/2012

2

Air Bags

•What’s the main function of the System?

•Material of Airbags?

Actual Working

Airbag Before Collision Airbag After Collision

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3

Inflation unit

•How does it INFLATES?

Effectiveness

This system has proven its effectiveness

• In frontal crashes reduction in d rivers death reduced by nearly 14%

•Passenger side airbags reducing death by nearly 11%

•NHTSA estimated reduction in risk by nearly 85% with the combination of seat belt and airbags compared than only seatbelt i.e60%

Car Model Head Injury Risk

Airbag No Airbag

Holden Commodore 28 48

Toyota Camry 20 44

Mitsubishi Magna 6 27

Ford Falcon 14 N. A.

This are some crash results which give the effectiveness of the system

12/14/2012

4

Different types of Airbags

DRIVERS SIDE FRONT AIRBAG

PASSENGER AIR BAG

Curtain Airbags

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5

Anti-lock Braking System

• Introduction?

•Advancement in the system?

•Working?

How Does the system Works?

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6

Working

Conventional Braking Whole process is controlled by driver applied break

paddle pressure;

ABS Braking Electric Sensors monitor the wheel speed

ABS microprocessor Compares the wheel speed

Control valve is energized.

Advantages:

Achives the Shortest Stopping distance

Better chance on Steering around obstacle

Reduced risk of skidding

Disadvantages:

Precautions should be taken while driving

Proved less effective on gravel road or road

compacted by snow

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7

Traction Control

Next Generation ABS

Uses ABS as a Building block.

Can be is a combination of ABS & Engine

control

Mainly the system has to control some

or all conditions

Retard or Suppress the spark to one or more

cylinders

Retard fuel supply to one or main cylinder

Break one or more wheel

Close the throttle, if the vehicle is fitted by

wire throttle

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8

Electronic Stability Control

Main components of the system

A) active wheel speed sensors;

B) steering angle sensor;

C) Yaw rate sensor

D) attached electronic control unit (ECU)

E) motor;

F) pressure sensor,

G) hydraulic unit.

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9

Steering Angle Sensor

Understeering (“plowing out”) Oversteering (“spinning out”)

Case Study

A S-Class Mercedes sedan testing Bosch's ESP system

12/14/2012

10

Central Locking System

Lock all the doors, boot, hood

Lock ignition

Panic Alarm