GOVERNMENT POLYTECHNIC AMRAVATI

(AN AUTONOMOUS INSTITUTE OF GOVT. OF MAHARASHTRA)

PRESENTED BY:-

NIRANJAN K. SONUNE

Seminar on:- hydractive suspension system

INTRODUCTION CONVENTIONAL SUSPENSION SYSTEM WHY HYDRACTIVE SUSPENSIVE HYDRACTIVE SUSPENSION SYSTEM LAYOUT

HYDRACTIVE-01 HYDRACTIVE-02 HYDRACTIVE-03 HYDRACTIVE-03+

ADVANTAGE DISADVANTAGE CONCLUSION

OUTLINE

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.

INTRODUCTION

Conventional suspension system

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.

WHY HYDRACTIVE SUSPENSION

To overcome problems of conventional suspension system

Better load distribution per axle

Decreases overload problem

Increases ride comfort

HYDRACTIVE SUSPENSION SYSTEM LAYOUT

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

HOW IT WORKS ?

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 For a pneumatic system- Air/gas is admitted or withdrawn from the system by compressors and exhaust valves, modifying its mass while keeping the volume constant.

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 .

WITH IMPROVED COMFORT AND HANDALING CHARACTRESTICS

ADVANCEMENT IN SUSPENSION

FIRST GENERATION-HYDRACTIVE 1

HYDRACTIVE-2

HYDRACTIVE-3Features:-

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.

•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.

HYDRACTIVE-3+

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.

ADVANTAGES

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

DISADVANTAGES

CONCLUSION

Hydractive Suspension is the need of today's automobile.

Handling & comfort can be achieved in today's need.

Low maintenance than conventional suspension system.

THANK YOU…