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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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The suspension system usually features both self-leveling hydracgive driver-variable ride heightto provide extra clearance in rough terrain. 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?

Stalled The Friendly Commodore Driver. This movement is registered by the height corrector which opens a valve to admit hydraulic fluid under pressure to “lengthen” the hydraulic strut and thereby re-establish the correct ride height.

However, due to the indirect coupling between this valve and the isolation piston 2 inside the control block, the hydraulics can stay in either position for extended periods of time with the electric valve disconnected, depending on the pressure differences between the strut and the main circuits.

Citroën hydropneumatic suspension – overview

jydractive Electric motor Hybrid vehicle drivetrain Electric generator Alternator. Below a publicity shot for the DS showing the interaction between hydraulics, represented by water and air represented by the ballons. Where appropriate, and within milliseconds, these computers switch an extra pair of suspension spheres in or out of the circuit, to allow the car a smooth supple ride in normal circumstances, or greater roll resistance for better handling in corners.

The moving parts of the system e. This lasts longer and requires less frequent attention. Trapped among pistons The electro-valve 5 is energized when the suspension is in its soft mode, hence, the default electrical position is hard.

Anti dive suspension is incorporated The rear brakes take their fluid from the rear suspension which pulls the tail down under heavy braking. To jack the car up, all that was required was to place it in the hydractve suspension position, place a simple stand under the car and then select the lowest suspension position.


Many models were also fitted with an anti-sink system that locks the system when the car is not running, using yet another sphere. The two wheels on the side of the car under which the stand is placed lift themselves off the ground. They can, however, be recharged which is cheaper than replacing them. Because the pressure there is proportional to the load, so is the braking power.

The system can be caught out by hump backed bridges – the body rises from the road surface as the apex of the bridge is reached, the height corrector then decides the car body is raised too high and reduces ride height as the vehicle descends the other side of the bridge – the body then crashes into the suspension bump stops. Furthermore, the self-levelling function also rids suspension design of a number of unwanted compromises that designers of conventionally sprung cars have to make since the suspension is always functioning around one predetermined position, no matter the car’s load, the various hhydractive issues hydracyive a much hydactive equation to solve.

Originally Posted by Alan S. The hydraulic system acquired a reputation for unreliability when it was prematurely released on the DS. The elements are practically the same as on Hydractive I:.

Hydropneumatic suspension

Rear brakes are powered from the rear suspension spheres. It is the simplest damper and one of the most efficient. Above a schematic of the DS showing the suspension system. Sensors Top left – suspension in “soft” state; the 22 valve 1 is energised, the slide valve opens allowing hydraulic fluid to flow between the between the suspension cylinders and the spheres 4 hydrachive 3 via the dampers 6. 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.

Hydropneumatic suspension – Wikipedia

Front to rear brake line 3. This was a foretaste of the system that was fitted to the astonishing DS 19 of By using this site, you agree to the Terms of Use and Privacy Policy. The metal and alloy parts of the system rarely fail even after excessively high mileages but the hydractige components especially those exposed to the air can harden and leak, typical failure points for the system. The large surface of the fluid in the reservoir readily absorbed moisture. In the DS, the high pressure hydraulic system also operated the clutch and gear change.


Hydractive 2

If the wrong type of fluid is used, the system must be hydrzctive and rinsed with Hydraflush, before draining again and filling with the correct fluid.

It was designed to overcome the biggest problem of the previous system, the very uncomfortable hard mode. The only real thing at this stage which is putting me off it at this stage it the “anti sink” valves, not so much what might go wrong with them dont worry, not much does apparently, they dont move much and they are well made due to the fact that they have to regulate so much pressure but the fact that the car doesnt sink to the ground hydactive a “proper” Citroen should.

The C5 also uses orange synthetic hydraulic fluid named LDS fluid [22] in hyddractive of the green LHM mineral oil used in millions of hydropneumatic vehicles. The electro-valves are driven simultaneously, in parallel.

Below the suspension system showing the spheres with the nitrogen represented in blue and the hydraulic fluid in red. On later cars fitted with antisink or Activa suspension, there may be as many as nine spheres. A nitrogen reservoir with variable volume yields a spring with non-linear force-deflection characteristics. A decision, he never would regret. A central sphere on each axle is switched in and out of circuit yhdractive alter the amount of suspension travel and damping.

Compared to earlier cars, the C5 stays at normal ride height even when the engine is turned off for an extended period, through the use of electronics. Please help improve this article by adding citations to reliable sources. Originally Posted by DoubleChevron.