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.

Author: Gromuro Garamar
Country: Canada
Language: English (Spanish)
Genre: History
Published (Last): 8 September 2012
Pages: 33
PDF File Size: 14.2 Mb
ePub File Size: 17.15 Mb
ISBN: 256-6-52336-259-6
Downloads: 25389
Price: Free* [*Free Regsitration Required]
Uploader: Kik

Spheres are not subject to mechanical wear, but do suffer pressure loss, mostly from nitrogen diffusing through the membrane. Above a schematic of the DS showing the braking system Below the hyrdactive system showing the spheres with the nitrogen represented in blue and hycractive hydraulic fluid in red.

Front brakes accumulator 2. The center sphere 1 is now supplied directly from the height corrector in soft mode. 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.

Above – a normally suspended car undertaking the slalom test.

Views Read Edit View history. Hydropneumatic suspension has a number of natural advantages over steel springs, generally recognized in the auto industry.

Height correctors act with some delay in order not to correct regular suspension hydractivf. The two wheels on the side of the car under which the stand is placed lift themselves off the ground.

Hydractive 2 | Citroën BX do-it-yourself

Ride height correction self levelling is achieved by height corrector valves connected to the anti-roll bar, front and rear. 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.

When a load is added, it stiffens as much as necessary. Failure to keep the oil clean is the main cause of problems. It seems rock hard but it still rides well, but when it comes to handling it’s equal to the BX 16V and I recently had a moment when some old chook in a Ford Festy was driving towards me, locked the jaw, knuckles turn white on the steering wheel and she politely turned straight across in front of me when I was around 4 car lengths away and doing a good 60 kph!!


The electro-valve 5 is energized when the suspension is in its soft mode, hence, the default electrical position is hard. Another advantage of the variable ride height was the ability to dispense with a conventional jack. Daring to be different p. There is a similar table for the thresholds of the steering wheel rotational speed as well. If the main suspension circuit has nominal pressure, the system stays in hard mode with the electric valve off or disconnected.

Spheres 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. It powers the front brakes first, prioritised via a security valve, and depending on type of vehicle, can power the steering, clutch, gearchange, etc. The following table shows the thresholds of steering wheel angle. BTW, whatever happened with the red e-Bay car? 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.

In the Sport setting the car’s suspension was always kept in its firmest mode. The symptom of pressure loss is a hard ride. June Learn how and when to remove this template message.

Hydractive 2

Steel-sprung cars need to have rear springs much stiffer than necessary for comfortable daily driving. Where appropriate, and within milliseconds, these computers hydractivw 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 22 algorithm of the computer became more sophisticated. In this new version the Sport setting would no longer keep the suspension system in firm mode, but instead lowered the thresholds significantly for any of the sensor readings also used in Comfort mode, allowing for a similar level of body firmness during cornering and acceleration, without the sacrifice in ride quality the Sport mode in Hydractive 1 systems had caused.

In the DS, the high pressure hydraulic system also operated the clutch and gear change. The system takes advantage of the fact that you can compress a gas but cannot compress a fluid. Other cars fitted with the system were the M 35 Wankel-engined prototype, the GZ Birotorsome variants of the H van and various Rolls Royce and Mercedes-Benz cars where it was used under licence. So I can say as far as I’m concerned, the VSX has an attraction if for nothing else but being very hyeractive in its handling.

Hydropneumatic suspension

The hydraulic system acquired a reputation for unreliability when it was prematurely released on the DS. It was this need that also drove the development of the 2CV ‘s interconnected suspension system.

They can, however, be recharged which is cheaper than replacing them. Spheres once had a threaded plug on top for recharging. Height correction and levelling 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.

Part of the Automobile series. It describes a development of the hydropneumatic suspension design using additional electronic sensors and driver control of suspension performance.

Above the Hydractive 2 system fitted to high specification variants of the Xantia and XM.

Author: admin