This document discusses hydractive suspension systems. It introduces conventional suspension systems and their limitations in maintaining stability and ride comfort. Hydractive suspension systems use hydraulic controls and electronic sensors to actively adjust ride height and damping. This allows the vehicle to maintain consistent geometry, traction, and stability under various loads and road conditions while providing improved ride quality. The document outlines several generations of hydractive systems and their advantages in areas like ride height control, stability, and reduced need for maintenance compared to conventional suspensions.

1. PRESENTED BY:-
NIRANJAN K. SONUNE
Seminar on:- hydractive suspension system

2.  INTRODUCTION
 CONVENTIONAL SUSPENSION SYSTEM
 WHY HYDRACTIVE SUSPENSIVE
 HYDRACTIVE SUSPENSION SYSTEM LAYOUT
 HYDRACTIVE-01
 HYDRACTIVE-02
 HYDRACTIVE-03
 HYDRACTIVE-03+
 ADVANTAGE
 DISADVANTAGE
 CONCLUSION

3. Hydro pneumatic suspension system.
 Use of additional electronic sensors and driver control of
suspension performance .
 Softer springs – better damping of road forces and
superior driver comfort.
 But it also leads to collapse under given weight in case of
heavy vehicles.
 Balancing of Both Handling & Comfort.

4.  When The Vehicle goes into potholes
or bump, the Suspension geometry
changes.
 On loading ground clearance
decreases.
 Unequal braking effort generated.
 Resonance frequency vary as per the
changing stiffness of the suspension
system.
 While cornering, vehicle rolls about
its longitudinal axis.
 Cant keep the tyre contact with
ground at all time.
 Loss of traction on bump and dips.
 Vehicle becomes dynamic unstable
 at high speed.

5. To overcome problems of
conventional suspension
system
Better load distribution
per axle
Decreases overload
problem
Increases ride comfort

6. 1] A standard Citroen
sphere
2] A hydraulically controlled
isolation valve
3] A ball and piston valve
4] Two damping elements
5 ]An electrically controlled
valve

7. Principle- Exactly the opposite of Boyle’s Law! What does
Boyle’s Law Say?
By keeping the mass of the gas constant and changing the
volume of its container, its pressure can be controlled. For a
pneumatic system- Air/gas is admitted or withdrawn from
the system by compressors and exhaust valves, modifying
its mass while keeping the volume constant.

8. 1. uses an inert gas, nitrogen (colored blue) as
spring medium .
2. The flexibility of gas decreases as increasing load
compresses suspension pistons.
3. Leading to reduction in volume of gas and
adding to its pressure .
4. Damping effect is obtained by forcing fluid
through two way restrictor between cylinder and
piston .

13. Features:-
1.Fluid pump independent of engine and electric
2.Computer supervises the car body height selection
3.The ECU used, can implement very sophisticated algorithms
to apply height correction, which were impossible with the
mechanically linked.
4.Mechanically operated height correctors become
electronically controlled.

14. •It would guarantees a constant ride height regardless
of the load or number of passengers
•It can lowers the car at speeds above 110 km/h to
optimize stability and fuel economy.
•On rough roads, it automatically raises for increased
clearance and comfort.
•The Hydractive III+ suspension system is maintenance
free for 5yrs/200,000kms.
•Similar to hydractive 2.

15. Ground clearance can be kept constant under any load variation.
Suspension geometry of the vehicle remains same in dynamic condition.
Because of this system, it keep the vehicle in contact with the road at all
time.
No need of Anti-Roll bar in vehicle.
Hydractive suspension system is maintenance free till 5 years.
Increases the dynamic stability of vehicle by lowering the ride height
when the vehicle speed increases above 110 km/hr.
Well packaged system leading to optimum space utilization.

16. The failure of sensor can cause uneven vehicle dynamics
Major Precaution should be taken while changing the
tyres.
Costly compared to conventional suspension system.
Only garages equipped with special tools and high skilled
person can repair this system

17. Hydractive Suspension is the need of today's
automobile.
Handling & comfort can be achieved in today's
need.
Low maintenance than conventional
suspension system.