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 rear spheres lie flat which permits an unobstructed boot floor with no suspension unit intrusions.

A ruptured membrane means suspension loss at the attached wheel; however, ride height is unaffected. A hysractive corrector is attached to the anti roll bar and when a load is placed in the car, the car body sinks. This page was last edited on hyddactive Septemberat Is this a Hydractive trait or do all Xantias do this? Front brakes accumulator 2. The following table shows the thresholds of steering wheel angle.

Hydropneumatic suspension

Hydropneumatics are inherently superior to steel springs for reasons that are often misunderstood. There are two cases leading to these corrected thresholds:. This results in a suspension which is extremely soft in its initial movement far softer than a steel spring but which becomes harder and harder as it is compressed far stiffer than a steel spring. This simplifies the ball valve arrangement with respect to Hydractive I. 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.

Does much go wrong electronically with this system, I have heard tales of the suspesnion resorting to “hard” mode if a fault is detected and the car not wanting to go back into “comfort” mode? The center sphere circuits hydraactive supports were redesigned: Views Read Edit View history. Archived from the original on Im probably gonna get flamed for saying this but I hydravtive 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?

Hydractive 2

Sensors Top left – suspension in “soft” state; the solenoid valve 1 is energised, the slide valve opens allowing hydraulic fluid to flow between the between the suspension cylinders and the spheres 4 and 3 via the dampers 6.


Additional uses of this system included the fully powered self centring steering system 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 to investigate hydraulic operation of windscreen wipers, an air dam brake and even the hydrcative and closing of windows. However, under some circumstances, the special Correction thresholds are observed instead.

The system takes advantage of the fact that you can compress a gas but cannot compress a fluid. It seems rock hard but it still rides well. The principles illustrated by the successful use of hydropneumatic suspension are now used in a broad range of applications, such as aircraft oleo struts and gas filled automobile shock absorbersfirst patented in the U.

Hydractive 2 | Citroën BX do-it-yourself

Sensors in the steering, brakes, suspension, throttle pedal and gearbox feed information on the car’s speed, acceleration, and road conditions to on-board computers. In other words, a fully loaded car will be as equally well controlled as a car with just one passenger.

On later cars fitted with antisink or Activa suspension, there may be as hydractvie as nine spheres. Above a schematic of the DS showing the suspension system.

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. Starting with Xantia model year and XM model yearall models featured an additional sphere that functioned as a pressure reservoir for rear brakes because of new hydraulic locks, letting the car retain normal ride height for several weeks without running the engine. This is where you should be now: Auto manufacturers try to balance these aims and locate new technologies that offer more of both.

Well Ive been doing some more research This was a foretaste of the system that was fitted to the astonishing DS 19 of Consequently, each time the suspension would rise, the fluid level in the reservoir dropped, drawing in fresh moisture-laden air.

June Learn how and when to remove this template message. Below right the rear suspension of the Xantia comprises trailing arms connected to an anti roll bar with height corrector attached.

Citroën hydropneumatic suspension – overview

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. If the main suspension circuit has nominal pressure, the system stays in hard mode with the electric valve off or disconnected. Above a schematic of the DS showing the suspension system Below a publicity shot for the DS showing the interaction between hydraulics, represented by water and air represented by the ballons.


More prosaic but nevertheless useful benefits include the ability to drive on terrain that is normally restricted to off-road vehicles, the ability to raise or lower the suspension to assist in loading or unloading the vehicle, to assist in changing a wheel, to facilitate towing and to make washing of the car easier. Below left the Xantia front suspension comprises MacPherson type struts with the Hydropneumatic suspension spheres mounted on top.

Retrieved from ” https: 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. It is also imperative to always use the correct fluid for the system; the two types of fluids and their associated system components are not interchangeable. The purpose of the main accumulator is to even out fluctuations in pressure.

Wow, you certainly learn a stack on AF. Daring to be different p. On the plus side, one can drive far quicker on indifferent road surfaces than might be believed possible this goes a long way to explaining the success of the marque in motorsport and handling is almost unaffected by a change in ride height caused by a full load.

Anti dive suspension is incorporated The rear brakes take their fluid from the rear suspension which pulls the tail down under heavy braking. There is a similar table for the thresholds of the steering wheel rotational speed as well.

Hydractuve 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? The two modes are practically the same as on the previous Hydractive system: Spheres once had a threaded plug on top for recharging.