On the Hydractive II, the relation between suspension modes and dashboard switch settings became more complicated: in both settings—Normal (the new name. A stylish 2 piece designed to keep you cool when you’re working hard. Featuring a breathable mesh panel for ventilation, the HydrActive 2. Well Ive been doing some more research.. And I have been reading about the Xantia VSX and its Hydractive 2 suspension set up. I know the.

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Its resolution have been doubled to 8 pulses generated per rotation, that is approximately 5 pulses per meter traveled although this depends somewhat on tire size. Additional uses of this system included the fully powered self centring steering hydraxtive DIRAVI or Varipower fitted to the SM and CX, levelling of the headlamps fitted to the SM and a number of design studies were undertaken hydractiive investigate hydraulic operation of windscreen wipers, an air dam brake and even the opening and closing of windows.

Challenger 2main battle tank of the British armyuses hydropneumatic suspension for better crew comfort and increased firing accuracy. The system takes advantage of the fact that you can compress a gas but cannot compress a fluid. The driver can make the suspension stiffen sport mode or ride hydractige outstanding comfort soft mode.

The hydropneumatic suspension system offers an unparalleled level of comfort and control although it must be admitted that it is not perfect. The chief problem with LHS was that it absorbed moisture and dust from the air which caused corrosion in the system. Below a publicity shot for the DS showing the interaction between hyrractive, represented by water and air represented hydrractive the ballons.

Another advantage of the variable ride height was the ability to dispense with a conventional jack. Wow, you certainly learn a stack on AF.

The result is that the spring rate is kept constant, regardless of the load of the car. In the DS, the high pressure hydraulic system also operated the clutch and gear change.

The nitrogen gas air as spring medium is approximately six times more flexible than conventional steel, so self-leveling is incorporated to allow the vehicle to cope with the extraordinary suppleness provided.

Height correctors act with some delay in order not to correct regular suspension movements. The difference is in the set of rules the computer uses to evaluate those circumstances: This is because of the inherent properties of a gas: The elements are practically the same as on Hydractive I:. I see it’s back in News. The reason for this is to equalize the pressure between all three spheres of an axle.


A control inside the car allows the ride height to be varied by the driver thereby aiding wheel changes. This page was last edited on 9 Septemberat The C5 features a decentralised system employing separate systems for power steering and braking while future developments may feature a pump for each road wheel and a totally active system the Activa is, in truth, reactivealbeit its reactions are so quick as to almost deserve the appellation which reads the road surface ahead of the car and provides precisely the correct amount of suspension travel.

Citroën hydropneumatic suspension – overview

Spheres once had a threaded plug on top for recharging. The internal algorithm of the computer became more sophisticated. The computer uses the same set of sensors as Hydractive I, the only difference is the vehicle speed sensor which is a Hall-effect sensor now. Spheres are not subject to mechanical wear, but do suffer pressure loss, mostly from nitrogen diffusing through the membrane.

Hydropneumatic suspension – Wikipedia

To jack the car up, all that was required was to place it in the highest suspension position, place a simple stand under the car and then select the lowest suspension position.

In other words, a fully loaded car will be as equally well controlled as a car with just one passenger. Im probably gonna get flamed for saying this but I just like the whole idea of my car sinking to the ground once I have parked it – I am more than willing to trade this off if there is a somewhat increased amount of driving pleasure in the handling and ride department?

The metal and alloy parts of the system rarely fail even after excessively high mileages but the rubber components especially those exposed to the air can harden and leak, typical failure points for the system.

The front and rear suspension circuits are identical but hydraulically independent. It powers the front brakes first, prioritised via a security valve, and depending on type of vehicle, can power the steering, clutch, gearchange, etc. Below left the Xantia front suspension comprises MacPherson type struts with the Hydropneumatic suspension spheres mounted on top. The high pressure pump powered by the engine pressurizes the circuit and the accumulator sphere.

Pressure goes from this circuit to the wheel spheres, pressurizing the bottom part of the spheres and rods connected to the wheel suspension.

It powers the front brakes first, prioritised via a security valve, and depending on type of vehicle, can power the steering, clutch, gear selector, etc.


Electronics provided a cheap, low weight solution for active suspension and anti lock brakes. A ruptured membrane means suspension loss at the attached wheel; however, ride height is unaffected. The C5 also uses orange synthetic hydraulic fluid named LDS fluid [22] in place of the green LHM mineral oil used in millions of hydropneumatic vehicles.

Some older cars had a separate front brake accumulator on power steering models.

Hydractive 2

LHM is a mineral oilquite close to automatic transmission fluid. The self-levelling system ensures that there is always the same suspension travel available irrespective of load.

Suspension works by means of a piston forcing LHM into the sphere, compacting the nitrogen in the upper part of the sphere; damping is provided by a two-way ‘leaf valve’ in the opening of the sphere. The rear brakes are powered from the rear suspension circuit. Automatic transmission Chain drive Clutch Constant-velocity joint Continuously variable transmission Coupling Differential Direct-shift gearbox Drive shaft Dual-clutch transmission Drive wheel Electrohydraulic manual transmission Electrorheological clutch Epicyclic gearing Fluid coupling Friction drive Gear stick Giubo Hotchkiss drive Limited-slip differential Locking differential Manual transmission Manumatic Parking pawl Park by wire Preselector gearbox Semi-automatic transmission Shift by wire Torque converter Transaxle Transmission control unit Universal joint.

Higher intelligence The computer uses the same set of sensors as Hydractive I, the only difference is the vehicle speed sensor which is a Hall-effect sensor now. This part of the circuit is at between and bars.

In the early fifties, France was noted for particularly poor road quality and therefore the only way to maintain a relatively high speed in a vehicle was if it could easily absorb road irregularities. The corrected threshold mode will be cancelled and the threshold returned to the original Compression and Rebound values in the table if the steering wheel angle exceeds the thresholds specified in the fourth column of the table. Stalled The Friendly Commodore Driver.

Ride height correction self levelling is achieved by height corrector valves connected to the anti-roll bar, front and rear. The electro-valve 5 is energized when the suspension is in its soft mode, hence, the default electrical position is hard.

In Hydractive 2, the preset names were changed to Sport and Comfort.