MAGIC BODY CONTROL

Seminar Guide, Presented by, Mr. Jithu J Sooraj k Asst. Professor Roll no:64Mechanical Dept.

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SCHEME OF PRESENTATION Introduction Classification Magic body control Components Working Driving modes Comparison Vehicle performance Equipped vehicles Merits and demerits References

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INTRODUCTION What is suspension system?

System which isolating automobile from road shocks

Consist of springs, dampers, Tires

Objective of suspension system

To prevent the road shocks transmitted To safeguard occupants and passengers from

road shock To preserve stability

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CLASSIFICATIONSUSPENSION SYSTEM

PASSIVE

ADAPTIVE

ACTIVE

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WHY MAGIC BODY CONTROL?

With the world’s first suspension system with “eyes”.

Like riding on a flying carpet.

Satisfying all requirements.

A magical combination.

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o Magic body control suspension system is an electronically controlled active suspension system o A stereo camera on the wind screen continually monitor the road surface.

oTogether with the information on the driving conditions, the control unit continually calculates the best control strategy for dealing with unevenness in the road

o Created by Mercedes-Benz

o Project Manager is Stefan Cytrynski.

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COMPONENTS

Electronic control unit(ECU) Stereo camera Reservoir Sensors Hydraulic servo mechanism Coil springs and Shock absorbers

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STEREO CAMERA Located on

wind screen

Continually monitor the road surface ahead 15 meters

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ELECTRONIC CONTROL UNIT (ECU)

Calculates the current driving status

Independent controlling of shock absorbers

RESERVOIR Used to store oil

Supplies the oil to the servomechanism as per the command of ECU

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SENSORS

The sensors continually monitor body movement and vehicle level and supply the controller with new data every ten milliseconds

Four level sensors, one at each wheel measure the ride level of the vehicle

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Three acceleration sensors called longitudinal, lateral, vertical acceleration sensors

The Longitudinal Acceleration Sensor reports acceleration and deceleration.

The Lateral Acceleration Sensor detects transverse or side-to-side movements.

Three Vertical Acceleration Sensors detect lifting motion and pitch and roll of the body.

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HYDRAULIC SERVO MECHANISM

It is a mechanism that uses automatic feedback and hydraulics to correct the performance of a machine

ECU directs the hydraulic servomechanisms on how to correct the car's positioning.

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COIL SPRINGS AND SHOCK ABSORBERS

Coil spring is the most common type of spring found on modern vehicles

Low cost and compact size

Shock absorber keeps the suspension from continuing to bounce after spring compression and extension

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WORKING

The stereo camera scan the road surface and provide corresponding signals to the ECU.

ECU determines the amount of pressure to be built in servo mechanism according to various signals from sensors

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The sensors and hydraulic servo mechanism generates forces to counteract the effects of the road surface.

By these combination the suspension take action before the wheels reach them.

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DRIVING MODES

Comfort

sport

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COMFORT MODE Sensitive response and soft damping

characteristics

The suspension level is automatically adjusted depending on the road speed.

Vehicle is lowered by ten millimeters at speeds over 120 km/h

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SPORT MODE Shock absorbers have more stiffer response

than comfort mode

Vehicle is lowered by10 millimeters at speeds below 120km/h

Besides these driving modes driver is able to select a suspension setting raised by 30 millimeters.

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COMPARISON

Reduced pitching

22 Reduced rolling tendency

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VEHICLE PERFORMANCE

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EQUIPPED VEHICLES

Mercedes-Benz S class

Rolls Royce Ghost

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MERITS

Stability at all time High level of ride comfort Minimizing uncomfortable body movements Successful elimination of roll and pitch

DEMERITSHigh initial costMalfunctioning can lead to a big collapseRequire super quick micro-computers

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REFERENCES “Automobile engineering” by Dr. Kripal Singh “Fast track” magazine A journal on modern suspension systems by

Ishan Raghava www.mercedes-benz.com www.automobilemag.com https://media.daimler.com/dcmedia