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Hydractive suspension System

  1. 1.  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.
  2. 2. 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.
  3. 3.  To overcome problems of conventional suspension system  Better load distribution per axle  Decreases overload problem  Increases ride comfort
  4. 4. 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
  5. 5. 1. uses an inert gas, nitrogen (colored blue) as spring medium Principle- Exactly the opposite of Boyle’s Law! 2. The flexibility of gas decreases as What does Boyle’s Law Say? increasing load compresses By keeping the mass of the gas constant and changing the volume suspension pistons of its container, its pressure can be controlled. 3. Leading to reduction in volume of gas and adding to its pressure For a pneumatic system- Air/gas is admitted or withdrawn from the system by compressors and exhaust valves, modifying its mass 4. Damping effect is obtained by forcing while keeping the volume constant. fluid through two way restrictor between cylinder and piston
  6. 6. ADVANCEMENT IN SUSPENSION Coming soon…. Conventional Spring System HYDRACTIVE 1 Hydro pneumatic HYDRACTIVE 2 Hydractive HYDRACTIVE 3 HYDRACTIVE 4
  9. 9. THIRD GENERATION- HYDROACTIVE 3 HYDROACTIVE 3 + Features • guarantees a constant ride height regardless of the load or number of passengers 1.Fluid pump independent of engine and electric • lowering the car at speeds above 110 kmh to optimize stability and fuel economy. 2. Computer supervises the car body height selection • 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.
  10. 10. 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.
  11. 11. 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. The failure of sensor can cause uneven vehicle dynamics Major Precaution should be taken while changing the tyres. Costly compared to conventional suspension system.  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  Hydractive Suspension is the need of todays automobile.  Handling & comfort can be achieved in todays need.
  12. 12.  Citroen Technical Guide.        