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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Higher intelligence The computer uses the same set of sensors as Hydractive I, the only difference is the vehicle speed sensor which is a Hall-effect sensor now.

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?

Some older cars had a separate front brake accumulator on power steering models. The hydraulic system acquired a reputation for unreliability when it was prematurely released on the DS.

Prior to the advent of cheap electronics, a totally hydraulic anti lock braking system had been built, together with zero roll suspension. Retrieved 12 June This type of suspension for automobiles was inspired by the pneumatic suspension used for aircraft landing gear, which was also partly filled with oil for lubrication and to prevent gas leakage, as patented in by the same company.

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.

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.


Hydropneumatic suspension

By using this site, you agree to the Terms of Use and Privacy Policy. This was a foretaste of the system that was fitted to the astonishing DS 19 of Trapped among pistons The electro-valve 5 is energized when the suspension is in its soft mode, hence, the default electrical position is hard.

When a load is hydractiev, it stiffens as much as necessary. They can, however, be recharged which is cheaper than replacing them. I see it’s back in News. Pressure flows from the hydraulic circuit to the suspension cylinders, pressurizing the bottom part of the spheres and suspension cylinders.

Hydractive 2 Advantages/Disadvantages?

In the case of main accumulator sphere failure, the high pressure pump is the only source of braking pressure for the front wheels. There are two cases leading to these corrected thresholds:.

On the plus side, one can drive far quicker on indifferent road surfaces than might be hydractivr 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. 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.

Although auto manufacturers understood the inherent advantages over steel springs, there were two problems. Hydropneumatically sprung cars can have a rear that is set very soft; one can easily push the empty car down with his hand. Other cars fitted with the system were the M 35 Hdyractive prototype, the GZ Birotorsome variants of the H van and various Rolls Royce hydractivw Mercedes-Benz cars where it was used under licence. Spheres consist of a hollow metal ball, open to the bottom, with a flexible desmopan rubber membrane, fixed at the ‘equator’ inside, separating top and bottom.


Hydractive 2 | Citroën BX do-it-yourself

At the heart of the system, acting as pressure sink as well as suspension elements, are the so-called spheres, five or six in all; one per wheel and one main accumulator as well as a dedicated brake accumulator on some models.

Newer spheres do not have this plug, but it can be retrofitted. A nitrogen reservoir with variable volume yields a spring with non-linear force-deflection characteristics. The front and rear suspension circuits are identical but hydraulically independent. Above – height corrector 3 admits hydraulic fluid which “lengthens” the strut and raises the vehicle to its normal ride height.

Hydractive 2

Many models were also fitted with an anti-sink system that locks the system when the car is not running, using yet another sphere. In hard mode, the electro-valve 5 closes and lets the pressure inside the center sphere 1 move the control piston into a position which closes off the center sphere completely. 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.

The hysractive sphere circuits and supports were redesigned: That’s about the only negative I can think of about VSX’s If it ain’t broke, use a 12″ shifter