hydractive suspension system
DESCRIPTION
TRANSCRIPT
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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.
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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.
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To overcome problems of conventional suspension system
Better load distribution per axle
Decreases overload problem
Increases ride comfort
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1] A standard Citroën sphere 2] A hydraulically controlled isolation valve 3] A ball and piston valve 4] Two damping elements 5 ]An electrically controlled valve
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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For a pneumatic system- Air/gas is admitted or withdrawn from the system by compressors and exhaust valves, modifying its mass while keeping the volume constant.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
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ADVANCEMENT IN SUSPENSION
HYDRACTIVE 1
HYDRACTIVE 2
HYDRACTIVE 3
Coming soon….
HYDRACTIVE 4
Conventional Spring System
Hydro pneumatic
Hydractive
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FIRST GENERATION- HYDROACTIVE 1
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SECOND GENERATION- HYDROACTIVE 2
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THIRD GENERATION- HYDROACTIVE 3 HYDROACTIVE 3 +
Features 1.Fluid pump independent of engine and
electric
2. Computer supervises the car body height selection
• guarantees a constant ride height regardless of the load or number of passengers
• lowering the car at speeds above 110 kmh 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.
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NEXT GENERATION- HYDROACTIVE 4
Hydractive 4 will offer 1. Dynamic Leveling 2. Each wheel will have separate height corrector & Pair of sphere. 3. Each wheel be able to independently switch between a firm and soft setting. ADVANTAGE Body roll is kept to an absolute minimum leading dynamic leveling, preventing pitch , yaw & roll.
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ADVANTAGES 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 utilisation
The failure of sensor can cause uneven vehicle dynamics
Major Precaution should be taken while changing the tyres.
Costly compared to conventional suspension system.
Hydractive Suspension is the need of todays automobile.
Handling & comfort can be achieved in todays need.
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Citroen Technical Guide.
http://en.wikipedia.org/wiki/Hydropneumatic_suspension http://www.carbibles.com/suspension_bible_pg3.html
http://www.citroencarclub.org.uk/drupal/node/36
http://www.citroenet.org.uk/miscellaneous/hydraulics/hydraulics-16.html
http://www.citroen.com.au/citroen-universe/technology/comfort/hydractive-iii-plus-suspension
http://www.autozine.org/technical_school/suspension/tech_suspension3.htm
http://citroen.tramontana.co.hu/suspension/various-suspension-systems http://www.myweb.com.au/citroen/cit_tech_hydropneu.htm
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