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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In the DS, the high pressure hydraulic system also operated the clutch and gear change. Brake rotation sensor 7. BTW, whatever happened with the red e-Bay car?

This also ensures that hydrative suspension’s spring-rate hardness is continuously adapted to the vehicle load. Furthermore, under heavy braking, hydraulic fluid is removed from the rear suspension causing the tail to drop providing inbuilt anti-dive.

Another advantage of the variable ride height was the ability to dispense with a conventional jack. 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. I see it’s back in News.

Hydropneumatic suspension

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. 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.

From Wikipedia, the free encyclopedia. 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. Nitrogen is used as the trapped gas to be compressed, since it is unlikely to cause corrosion.

The C5 also uses orange synthetic hydraulic fluid named LDS fluid [22] in place of the green LHM mineral oil used in millions of hydropneumatic vehicles.

Maybe it was a dodgy car? LHM is a mineral oilquite close to automatic transmission fluid. 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. Additional benefits include an absence of diagonal pitching, hydractiv constant ride height ensures headlamp beams are always properly aligned, hydractivf of load and aerodynamics remain unaffected by load thanks to a constant angle of attack.


Hydractive 2 Advantages/Disadvantages?

Archived from the original on In addition to the superb comfort, they also have advantages related to car handling and control efficiency, solving a number of problems which are inherent in the use of steel springs. Spheres hydracrive had a threaded plug on top for recharging. Thus when the car is unladen, the pressure within the spheres is in balance.

Challenger 2main battle tank of the British armyuses hydropneumatic suspension for better crew comfort and increased firing accuracy. Below left the Xantia front suspension comprises MacPherson type struts with the Hydropneumatic suspension spheres mounted on top. The thresholds for body movement obey additional rules. This part of the circuit is at between and bars. Then again tyres were wider and lower profile also which accounts for some of the difference.

This was a foretaste of the system that was fitted to the astonishing DS hydractige of Hydractiive high pressure pump, powered by the engine, pressurizes the hydraulic fluid LHM and an accumulator sphere maintains a reserve of hydraulic nydractive.

Timely recharging, approximately every 3 years, is thus vital. This simplifies the ball valve arrangement with respect to Hydractive I. This effect hydravtive especially pronounced at the rear where the designer of a steel-sprung car has to make a compromise because the rear suspension has to be able to deal with a large range of loads. The hydropneumatic suspension system offers an unparalleled level of comfort and control although it must be admitted that it is not perfect.

With a steel-spring car, either the car would be set up to be comfortable with passengers but getting too soft as more weight is added becoming uncontrollable under full payloador it would be too stiff with passengers and okay on full payload. Steel-sprung cars need to have rear springs much stiffer hhydractive necessary for comfortable daily driving. In the early fifties, France was noted for particularly poor road quality and therefore the only way to maintain a relatively high speed in a vehicle was if it could easily absorb road irregularities.

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. Hydractive 1 suspension systems had two user presets, Sport and Hydracitve.

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. 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.


It does sound like an very interesting set up though, ill have to certainly consider it? 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.

The corrected threshold mode will be cancelled and the threshold returned to the original Compression and Rebound values in the table if the steering wheel angle exceeds the thresholds specified in the fourth column of the table.

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

Many models were hydradtive fitted with an anti-sink system that locks the system when the car is not running, using yet another sphere. I can’t speak of comparisons because I own the only Xantia in probably mile radius, but I must admit, I have some reservations as to whether mine is soft enough in the front and if it’s normal or not.

The dust inhalation problem continued, so a filter assembly was fitted into the hydraulic reservoir. If the value observed by the sensor exceeds the threshold for the actual vehicle speed and hyvractive 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.

When the car is too high e. By using this site, you agree to the Terms of Use and Privacy Policy. 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. It sure sounds a more complex system?

The moving parts of the system e. The hydraulic hydracitve acquired a reputation for unreliability when it was prematurely released on the DS.

The hydractkve now is 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.