ELETROMAGNETIC SUSPENSION SYSTEM

Objectives of Suspensions

To prevent the road shocks from being transmitted to the vehicle parts.

To keep the vehicle stable while in motion by providing good road holding during driving cornering and braking.

Provides safe vehicle control and free of irritating vibrations and reduce wear and tear.

COMMON SUSPENSIONS

Front SuspensionSolid I-BeamTwin I-BeamMacPherson StrutShort-Long Arm

Rear SuspensionNon Independent Rear Leaf SpringsNon Independent Rear Coil SpringsTrailing ArmBeam

Solid I-Beam

Used on trucks and other large vehicles

Economical Simple design Low Maintenance Excellent load capacity Non-independent design Uncomfortable ride quality Poor handling

Found on many Ford trucks Forged, cast, or stamped axles Excellent load capacity Requires special equipment for

alignment adjustments

Twin I-Beam

Macpherson Strut Short-Long Arm

One of the most popular systems One Control Arm Ideal for front wheel drive Light weight Economical Good ride quality and handling

characteristics Used for both front and rear

suspensions

Independent design Uses an upper and a lower control

arm Uses either torsion bars or coil

springs Good ride quality and handling

characteristics Heavy and complex design

requires a lot of space

Rear Leaf Springs Rear Coil Springs

Non-independent design Similar to front solid I-beam

axle Large load carrying capacity

Non-independent design Uses coils and control arms

instead of leaf springs Good load carrying capacity

Trailing Arm Rear Beam

Independent Design Uses individual lower control

arms Uses coil springs and shocks Good ride quality

Non-independent design Stamped beam axles Uses coil springs and trailing

arms Light and simple design

Active Suspension Systems

Bose Suspension Magneto-Rheological Technology

BOSE SUSPENSION SYSTEM

Electromagnetic motors at each wheel instead of traditional shocks and struts.

Sensors at various locations to detect body and suspension movement.

Comparison of Factory-Installed and Bose Suspensions: Body Motion on Bump Course

BOSE SUSPENSION SYSTEM

Uses sensor measurements to instantaneously counteract road forces

Produces excellent ride quality and superior control in the same system

BOSE SUSPENSION COMPONENTS

Linear Electromagnetic Motor Responds quickly enough to counter the effects of bumps and road

irregularities Power Amplifier

Sends power to the motor during extension and returns power during retraction

Control Algorithms Observe sensor measurements and send commands to the power

amplifiers

Linear Electromagnetic Motor

(a) Conventional passive suspension system. (b)Electromagnetic suspension system.

Consists of magnets and coils of wire.

When electrical power is applied to the coils, the motor retracts and extends.

BOSE SUSPENSION SYSTEM

Linear motor

BENEFITS

Bose SuspensionSuperior comfortSuperior controlReduces body roll during turnsReduces need for camber roll during

turnsRequires only 1/3 of the power

needed by the ACThe system is regenerative

Disadvantages

High initial cost High repair costs Complex systems Requires high precision

machinery and skilled workers

Applications

Bose Suspension System will be offered on high end

luxury vehicles within the next 5 years. The same technology has been

applied in Military applications.

Conclusion

Electromagnetic suspensions offer a wider range of comfort and control than most current suspension systems.

Offers unmatched vehicle handling performance.

May eventually find their way into more common production vehicles.

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