Active Suspension
Presented by xxxxxxx
Guided byxxxxxxxxxxxxxxx
Suspension system
Suspension is the term given to the system of springs, shock absorbers and linkages that connects a vehicle to its wheels
Serve a dual purpose – contributing to the car's handling and braking.
Keeps vehicle occupants comfortable and well isolated from road noise, bumps, and vibrations,etc
Need of suspension system
Prevent the road shocks from being transmitted to the vehicle parts
To keep the vehicle stable while in motion.
Provides safe vehicle control and free of irritating vibrations and reduce wear and tear.
Suspension Parts
FrameSuspension
systemSteering
systemWheels
Springs Dampers Anti-sway
bars
Fundamental components of any suspension
DIFFERENT SUSPENSION SYSTEMS
Conventional Conventional suspension systemsuspension system
Active suspension Active suspension systemsystem
Parameters that can be improved by ACTIVE SUSPENSION
Ride ControlRide Control
Height ControlHeight Control
Roll ControlRoll Control
COMPONENTS
An electronic control unit (ECU)
Sensors
Actuator
Adjustable shocks and springs
WORKING
SOFTWARE
SOFTWARE - MODULES
Motion Module Calculation Module Interaction Module
SOFTWARE FLOWCHART
HARDWARE FLOWCHART
Sensors And Controller
Functions of Active Suspension
Improves driver control, safety and stability. Eliminates sway and reduces roll on corners Reduces axle wrap Maximum safety Absorbs load, rather than resisting it, thereby
ensuring a much more comfortable ride Eliminates the need for fitting extra blades
which harden the ride Better handling and control in windy and rough
road conditions Minimize wear on tires, shocks, springs
Active Suspension Systems
Bose Suspension Magneto-Rheological Technology
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
Bose Suspension System
Electromagnetic motors-attached at each wheel.
Main advantage of electromagnetic approach-faster response
Comparison of Factory-Installed and Bose Suspensions: Body Motion on Bump Course
Bose Suspension System
Power amplifier delivers power to the motor Control Algorithms uses sensor measurements
to instantaneously counteract road forces Produces excellent ride quality and superior
control in the same system
Bose vs. Conventional Suspension
Benefits of Bose Suspension System
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
Applications
System high end luxury vehicles such as Lotus, Infiniti, and Mercedes-Benz
Used in F1 cars The same technology
has been applied in Military applications.
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 of Magneto-Rheological Technology
Improved road handling Improved wheel control Smoother ride than conventional
systems Reduces noise and virbations Continuous range of damping
Applications
Currently offered on Cadillac SRX and Seville STS models.
Offered on the Chevrolet Corvette for the 2003 model year.
Mercedes S600 BMW 7 series
Disadvantages of Active Suspension Systems
High initial cost High repair costs Complex systems Complex
algorithms
Recent Developments
Supension products developed by Öhlins Racing AB in 2010
contd……..
Piezo TEMS developed by Toyota uses piezoelectric ceramics for a
sensor good drivability and vehicle
stability can be obtained with an improved riding comfort
Conclusion
Offer a wider range of comfort and control
Reduce accidents May eventually find their way into more
common production vehicles.