Post on 18-Nov-2014
Outline
Common Types of Suspensions
Active Suspensions Benefits Disadvantages Applications Conclusion
Common Suspensions
Front Suspension Solid I-Beam Twin I-Beam MacPherson Strut Short-Long Arm
Rear Suspension Non Independent
Rear Leaf Springs Non Independent
Rear Coil Springs Trailing Arm Beam
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
Twin I-Beam
Found on many Ford trucks
Forged, cast, or stamped axles
Excellent load capacity Requires special
equipment for alignment adjustments
MacPherson Strut
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
Short-Long Arm
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
Non-independent design
Similar to front solid I-beam axle
Large load carrying capacity
Rear Coil Springs
Non-independent design
Uses coils and control arms instead of leaf springs
Good load carrying capacity
Trailing Arm
Independent Design Uses individual
lower control arms Uses coil springs
and shocks Good ride quality
Rear Beam
Non-independent design
Stamped beam axles
Uses coil springs and trailing arms
Light and simple design
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
Magneto-Rheological Technology
Dampers contain magnetic particles suspended 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
Benefits
Bose Suspension Superior comfort Superior control Reduces body roll during
turns Reduces need for camber
roll during turns Requires only 1/3 of the
power needed by the AC Wider damping range than
Magneto-Rheological systems
Magnetic Ride Control Improved road handling Improved wheel control Smoother ride than
conventional shocks and struts
Reduces noise and virbations
Continuous range of damping
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.
Magnetic Ride Control Currently offered on
Cadillac SRX and Seville STS models.
Offered on the Chevrolet Corvette for the 2003 model year.
Mercedes S600 BMW 7 series