active suspension systems
TRANSCRIPT
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Active Suspension Systems
Anthony Griffin
Bradley Rouse
Philip Woodward
MAE 442
Dr. Klang
5/6/2005
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Outline
Common Types of
Suspensions
Active Suspensions
Benefits
Disadvantages
Applications Conclusion
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Common Suspensions
Front Suspension
Solid I-Beam
Twin I-Beam
MacPherson Strut
Short-Long Arm
Rear Suspension
Non Independent
Rear Leaf Springs
Non Independent
RearCoil Springs
Trailing Arm
Beam
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Solid I-Beam
Used on trucks and otherlarge vehicles
Economical Simple design
Low Maintenance
Excellent load capacity
Non-independent design
Uncomfortable ridequality
Poor handling
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Twin I-Beam
Found on many Ford
trucks
Forged, cast, orstamped axles
Excellent load capacity
Requires special
equipment for alignmentadjustments
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MacPherson Strut
One of the mostpopular systems
One Control Arm
Ideal for front wheeldrive
Light weight
Economical
Good ride quality andhandling characteristics
Used for both front andrear suspensions
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Short-Long Arm
Independent design
Uses an upper and alower control arm
Uses either torsionbars or coil springs
Good ride quality andhandlingcharacteristics
Heavy and complexdesign requires a lot ofspace
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Rear Leaf Springs
Non-independent
design
Similar to front solidI-beam axle
Large load carrying
capacity
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RearCoil Springs
Non-independent
design
Uses coils andcontrol arms instead
of leaf springs
Good load carrying
capacity
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Trailing Arm
Independent Design
Uses individual
lower control arms
Uses coil springs
and shocks
Good ride quality
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Rear Beam
Non-independent
design
Stamped beamaxles
Uses coil springs
and trailing arms
Light and simple
design
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Active Suspension Systems
Bose Suspension Magneto-Rheological
Technology
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Bose Suspension System
Electromagneticmotors at each wheel
instead of traditionalshocks and struts.
Sensors at variouslocations to detectbody and suspensionmovement.
Comparison of Factory-Installed and Bose
Suspensions: Body Motion on Bump
Course
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Bose Suspension System
Uses sensor measurements to instantaneously
counteract road forces Produces excellent ride quality and superior
control in the same system
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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 duringretraction
Control Algorithms Observe sensor measurements and send commands to the power
amplifiers
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Bose vs. Stock Suspension
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Magneto-Rheological Technology
Dampers contain magnetic particlessuspended in fluid
Magnetic field within the fluid aligns particles Creates resistance to movement and
increases damping
Variable magnetic field creates more or less
resistance as needed System can change up to 1000 times per
second
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Benefits
Bose Suspension Superior comfort
Superior control
Reduces body roll duringturns
Reduces need for camberroll during turns
Requires only 1/3 of the
power needed by the AC
Wider damping range thanMagneto-Rheologicalsystems
Magnetic Ride Control Improved road handling
Improved wheel control
Smoother ride thanconventional shocks andstruts
Reduces noise andvirbations
Continuous range ofdamping
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Disadvantages
High initial cost
High repair costs
Complex systems
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Applications
Bose Suspension
System will be offered
on high end luxuryvehicles within the
next 5 years.
The same technology
has been applied in
Military applications.
Magnetic Ride Control
Currently offered on
Cadillac SRX and SevilleSTS models.
Offered on the Chevrolet
Corvette for the 2003
model year.
Mercedes S600
BMW 7 series
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Active Military Application
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Conclusion
Active control suspensions offer awider range of comfort and control
than most current suspensionsystems.
Offers unmatched vehicle handlingperformance.
May eventually find their way into morecommon production vehicles.