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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Hydropneumatic suspension

Above a schematic of the DS showing the braking system Below the suspension system showing the spheres with the nitrogen represented in blue and the hydraulic fluid in red. The two wheels on the side of the car under which the stand is placed lift themselves off the ground.

If the value observed by the sensor exceeds the threshold for the actual vehicle speed and the suspension setting, the suspension will switch to hard mode; it will revert to soft when the corresponding value drops below the threshold for at least 1.

When the hydractie operates, the ram pushes oil into the sphere, thereby altering the volume and therefore the pressure of the gas. In the DS, the high pressure hydraulic system also operated the clutch and gear change.

When a load is added, it stiffens as much as necessary. Thanks heaps for the information – I certainly will keep my eyes out for a good condition VSX, the specs though which Mandrake I think do differ from the VSX’s we got here, I dont think the ones here have the electric seats? Automatic transmission Chain drive Clutch Constant-velocity hydractie 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.


On later cars fitted with Hydractive or Activa suspension, there may be as many as ten spheres. Consequently, each time the suspension would rise, the fluid level in the reservoir dropped, drawing in fresh moisture-laden air.

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

Above the Hydractive 2 system fitted to high specification variants of the Xantia and XM. Another advantage of the variable ride height was the ability to hydtactive with a conventional jack.

This also ensures that the suspension’s spring-rate hardness is continuously adapted to the vehicle load. At the heart of the system are the so-called ‘spheres’ one per wheel and one main accumulator as well as a dedicated brake accumulator on some models.

Below a publicity shot for the DS showing the interaction between hydraulics, represented by water and air represented by the ballons. The thresholds for body movement obey additional rules. A ruptured membrane means suspension loss at the attached wheel; however, ride height is unaffected.

Well Ive been doing some more research The hydraulic system acquired a reputation for unreliability when it was prematurely released on the DS. It is located on the gearbox where the speedometer cable attaches, or in some versions, on the cable itself. Each sphere contains a diaphragm behind which a quantity of nitrogen is trapped.

Add Thread to del. Front suspension sphere Above – a normally suspended car undertaking the slalom test. Advantages of the system Hydropneumatics are inherently superior to steel springs for reasons that are often misunderstood.

Bottom left – suspension is in “firm” mode; the solenoid valve 1 is not energised, the slide valve takes up a position which blocks the movement of hydraulic fluid between the two main spheres 4 on each axle and isolates the additional spheres 3 from them both.

Retrieved 12 June Usually steel-sprung cars are either too soft “comfortable”or too stiff “sporty”or some intermediate compromise, while hydropneumatics offer “two cars in one”.


Part of the Automobile series.

The whole high pressure part of the system is manufactured from steel tubing of small diameter, connected to valve control units by Lockheed type pipe unions with special seals made from desmopan rubber, a type of rubber compatible with the LHM fluid. Spheres once had a threaded plug on top 22 recharging.

Wow, hydactive certainly learn a stack on AF. Personally I much prefer the VSX, however Trixie is most certainly right, buy the best car you can find for the price regardless of it’s spec.

Hydractive 2

Switching to Sport does not mean sticking to a hard, uncomfortable ride any more. Newer spheres do not have this plug, but it can be retrofitted. A hydropneumatic system combines the advantages of two technological principles:. Above a schematic of the DS showing the braking system. LHM has to squeeze back and forth through this bydractive which causes resistance and controls the suspension movements.

Hydractive 2 | Citroën BX do-it-yourself

A height corrector is attached to the anti roll bar and when a load is placed in the car, the car body sinks. 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.

Car height correction works by height correctors connected to the front and rear anti-roll bars and permit more more fluid to travel under pressure to the spheres when it detects that the suspension is lower than the pre-determined ride height e. The chief problem with LHS was that it absorbed moisture and dust from the air which caused corrosion in the system.