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The moving parts of the system, e.g., suspension strut or steering ram, are sealed by contact seals between the cylinder and piston for tightness under pressure. The other plastic/rubber parts are return tubes from valves such as the brake control or height corrector valves, also catching seeping fluid around the suspension push-rods.
The Xantia also was the last Citroën vehicle to use a common hydraulic circuit for suspension, brakes and steering like the pioneering Citroën DS. The Xantia had several variants of the Hydraulic system: Hydropneumatic suspension (5 spheres) Hydractive 2 suspension (7 spheres) Hydropneumatic (anti-sink) suspension (6 spheres) [4]
The hydraulic cylinder was fed with hydraulic fluid from the main pressure reservoir via a height corrector, a valve controlled by the mid-position of the anti-roll bar connected to the axle. If the suspension was too low, the height corrector introduced high-pressure fluid; if it was too high, it released fluid back to the fluid reservoir.
The Hydractive system was soon to become available to the public first in Citroën's XM model 1989, and Xantia model 1993. In 1995 Activa prototypes' active anti-roll-bar was introduced in the Xantia Activa , making it one of the few production cars to have active suspension.
An active suspension is a type of automotive suspension that uses an onboard control system to control the vertical movement of the vehicle's wheels and axles relative to the chassis or vehicle frame, rather than the conventional passive suspension that relies solely on large springs to maintain static support and dampen the vertical wheel movements caused by the road surface.
The hydraulic systems were also a lot quieter when maneuvering; this was due to the changes the "Anti-Sink" system brought. Early cars, 'sinkers', had a single output hydraulic pump which had its output divided into separate circuits, one for the power steering and one for the suspension/brake circuits (power steering needs a large flow rate ...
The Citroën Traction Avant (French pronunciation: [tʁaksjɔnaˈvɑ̃]) is the world's first monocoque-bodied, front-wheel drive car that was mass-produced. [2] A range of mostly four-door saloons and executive cars, as well as longer wheelbased "Commerciale", [3] and three row seating "Familiale" models, were produced with four- and six-cylinder engines, by French carmaker Citroën from 1934 ...
This high-pressure hydraulic system would form the basis of over 9 million Citroën cars, including the DS, SM, GS, CX, BX, XM, Xantia, C5, and C6. Self-levelling suspension is the principal user benefit: the car maintains a constant ride height above the road, regardless of passenger and cargo load and despite the very soft suspension.