Download - Active Suspensions
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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