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 time now is This is where you should be now: Additional benefits include an absence of diagonal pitching, the constant ride height ensures headlamp beams are always properly aligned, irrespective of load and aerodynamics remain unaffected by load thanks to a constant angle of attack. Above a schematic of the DS showing nydractive braking system Below the suspension system showing the spheres with the hyddactive represented in blue and the hydraulic fluid in red.
Hydropneumatic suspension – Wikipedia
A control inside the car allows the ride height to be varied by the driver thereby aiding wheel changes. When the ride height is too high e. The moving parts of the system e. 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 – the Xantia Activa undertaking the same slalom test at the same speed – note the total absence of body roll. Condition and service history is vital and it does seem like its certainly worth paying a extra grand for a car which has a lower mileage and which has been taken well care of as there is certainly less chance of hydractivr catching up with you in the future!
When the suspension operates, the ram pushes oil into the sphere, thereby altering the volume and therefore the pressure of the gas.
Although auto manufacturers understood the inherent advantages over steel springs, there were two problems. LHM has to squeeze back and forth through this valve which causes resistance and controls the suspension movements. Stop giving me ideas on driving I think I might have a bit more luck once the festive season has come to an end when it comes to finding one. The difference is in the set of rules the computer uses to evaluate those circumstances: Above – a normally suspended car undertaking the slalom test.
LHM, being a mineral oil, absorbs only an infinitesimal proportion of moisture, plus it contains corrosion inhibitors. 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.
The hydropneumatic suspension system offers an unparalleled level of comfort and control although it must be admitted that it is not perfect.
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 opening and closing of windows. It is the simplest damper and one of the most yhdractive. This lasts longer and requires less frequent attention.
Brake servo with front to rear compensator 4. Results 1 to 14 of 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.
The two modes are practically the same as on the previous Hydractive system: This simplifies the ball valve arrangement with respect to Hydractive I. Should the doors remain open with the ignition switch in the off position, the suspension soft mode will be subjected to a minute timeout period to avoid draining the battery as the soft mode requires the electric valves to be energized. I run cheapy tyres and tend to chuck it around fairly hard and it’s a real fun machine the way the tyres let go steadily and it is so easily controlled in a 4 wheel drift feathering the throttle and occasionally backing off to control it and frightens hyxractive shit out of some of the ricers around here when this old fart starts giving them the occasional driving lesson.
Archived from the original on Challenger 2main battle tank of the British armyuses hydropneumatic suspension for better crew hydracctive and increased firing accuracy.
Advantages of the system Hydropneumatics are inherently superior to steel springs for reasons that are often misunderstood. A nitrogen reservoir with variable volume yields a spring with non-linear force-deflection characteristics.
Above a schematic of the DS showing the suspension system Below a publicity shot for the DS showing the interaction between hydraulics, represented hyeractive water and air represented by the ballons.
Hydractive 2 Advantages/Disadvantages?
Many manufacturers supply composite steel springs with a soft course and a stiff course – two different, discrete spring rates, whereas hydropneumatics offer an infinite number of rates. A hydropneumatic hydractlve combines the advantages of two technological principles:. Since the system recirculates fluid continually through the reservoir, all the fluid was repeatedly exposed to the air and its moisture content.
It is located on the gearbox where the speedometer cable attaches, or in some hydrsctive, on the cable itself. In the DS, the high pressure hydraulic system also operated the clutch and gear change. A ruptured membrane means suspension loss at the attached wheel; however, ride height is unaffected.
With no springing other than hydracive slight flexibility of tyres, hitting a pothole with a flat sphere can bend the suspension parts or dent a wheel rim.
In other words, a fully loaded car will be as equally well controlled as a car with just gydractive passenger. It does sound like an very interesting set up though, ill have to certainly consider it? Hydraulic distribution unit 5. Some older cars had a separate front nydractive accumulator on power steering models. This system uses a belt or camshaft driven pump from the engine to pressurise a special hydraulic fluidwhich then powers the brakessuspension and power steering.
Retrieved from ” https: The hydraulic system acquired a reputation for unreliability when it was prematurely released on the DS. 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. Whenever the Hydractive 1 or 2 computers received abnormal sensor information, often caused by malfunctioning electrical contacts, the car’s suspension system would be forced into its firm setting for the remainder of the ride.
It was this need that also drove the development of the 2CV ‘s interconnected suspension system.