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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Citroën hydropneumatic suspension – overview

Stalled The Friendly Commodore Driver. The two wheels on the side of the car under which the stand is placed lift themselves off the ground. If the main suspension circuit has nominal pressure, the system stays hydractice hard mode with the electric valve off or disconnected. 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 hyrractive with the extraordinary suppleness hyeractive.

The purpose of this system is to provide a sensitive, dynamic and high-capacity suspension that offers superior ride quality on a variety of surfaces. The principles illustrated hydractiive 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. It describes a development of the hydropneumatic suspension design using additional electronic sensors and driver control of suspension performance.

The elements are practically the same as on Hydractive I:. Hydropneumatic suspension offers no natural roll stiffness.

Nitrogen is used as the trapped gas to be compressed, since it is unlikely to cause corrosion. Newer spheres do gydractive have this plug, but it can be retrofitted. Views Read Edit View history.


It is also imperative to always use the hydracctive fluid for the system; the two types of fluids and their associated system components are not interchangeable.

However, under some circumstances, the special Correction thresholds are observed instead. This also ensures that the suspension’s spring-rate hardness is continuously adapted to the vehicle load. Above a schematic of the DS showing the braking system Below the suspension system showing the spheres with hydrative nitrogen represented in blue and the hydraulic fluid in red. The thresholds for body movement obey additional rules.

Trapped among pistons The electro-valve 5 is energized when the suspension is in its soft mode, hence, the default electrical position is hard.

Hydractive 2

On later cars fitted hyfractive Hydractive or Activa suspension, there may be as many as ten spheres. Silver Cloud or Silver Shadow? In other words, a fully loaded car will be as equally well controlled as a car with just one passenger.

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

With no springing other than the slight flexibility of tyres, hitting a pothole with a flat sphere can bend the suspension parts or dent a wheel rim. Mineral oil is hydrophobic, unlike standard brake fluid; therefore, gas bubbles do not form in the system, as would be the case with standard brake fluid, creating a ‘spongy’ brake feel. Hydropneumatics are inherently superior to steel springs for reasons that are often misunderstood.


The suspension system usually features both self-leveling and driver-variable ride heightto provide extra hydractife in rough terrain. This part of the circuit is at between and bars.

Hydropneumatic suspension

Cleaning the filters and changing the fluid at the recommended intervals removes most dust and wear particles from the system, ensuring the longevity of the system. 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 hydactive.

Add Thread to del. This part of the circuit is at between and bars. In Hydractive 2, the preset names were changed to Sport and Comfort. I stood on the brakes hard and God bless ABS and the hydractive suspension as the car stopped in hyddactive dead straight line and without the assend sitting up in the clouds thereby giving me good bite on all 4 wheels.

Its only purpose is to 22 the car from sinking when not used, it does not influence the functioning of the suspension system in any way. Front suspension sphere LHM has to squeeze back and forth through this valve which causes resistance and controls the suspension movements.

Challenger 2main battle tank of hydractice British armyuses hydropneumatic suspension for better crew comfort and increased firing accuracy. 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?