An active suspension system uses sensors, an electronic control unit, actuators and adjustable shocks/springs to actively adjust the suspension based on driving conditions like wheel speed, braking, and acceleration. It improves ride control, reduces body roll, and provides better handling, safety and passenger comfort compared to conventional passive suspension systems. However, active suspension systems are more complex and expensive than traditional systems.

1. Active Suspension System
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2. Suspension Systems
Conventional suspension system
Active suspension system

3. A computerized system in
automobiles that actively
adjusts the suspension in
response to driving
conditions.

4. Active suspension
Body
G-sensor
Controller
(ECU)
Wheel
Actuator

5. Wheel speed
Brake condition
Vertical acceleration
Lateral acceleration
Steering wheel position
Vehicle level position
SENSORS
ECU SERVORS/ACTUATORS
BASIC REPRESENTATION OF ACTIVE SUSPENSION

6. Parameters that can be improved
Ride Control
Height Control
Roll Control
Dive Control
Squat Control

7. COMPONENTS
A Computer or an electronic control unit (ECU)
Sensors
Actuator or Servo
Adjustable shocks and springs

9. Sensors And Controller

10. Functions of Active Suspension
Improves driver control, safety and stability, with or without a
load .
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, shackles and leaf springs

11. Roll on Corners

13. Active suspension mimics the
functions of the human body
The sensors are nerve ends
The Electronic Control Unit represents our mind
Wires connecting the whole thing are the central
nervous system
The servos and actuators resemble the muso-
skelatel portion .

15. Example
Mercedes CL coupe

16. ADVANTAGES
•Stabilizes the wheel independently.
•Increases the overall grip of the vehicle, hence
creating a safer ride.
•It has soft spring which improves ride quality and
passenger comfort.
•Eliminates body role during high speed cornering.
•Anti role bar is omitted.
•Ride height is not affected by varying static load.

17. Draw-backs
Need for a large external power source
Complex control algorithms
Complex closed-loop control systems.
Requirement of fast-acting devices
Increased cost

18. Conclusion
In the case of active suspension system, as in any
other innovations of automotive technology, today's
innovation is tomorrow's standard feature. In spite of its
high initial cost, let us expect to see them in the Indian
roads soon. The trickle-down effect will take some time, but
it'll happen and when such a time comes we can expect
much lesser accidents, less fatalities and more comfort in
driving the roads.