Citroën DS - [HD] - Start & Hydropneumatic suspension - hidroneumática there Arranque
C1 to C6 and DS3 to DS5, all Citroens are advertised with the slogan Creative Technology Today, it always seems that French company made cars that rival just what the Germans, but if we look through nearly a century of history, we find they really did invent something extraordinary, something they hoped to be revolutionary.
In 1952, Citroën has forever changed the car's suspension technology, introducing their first vehicle with hydropneumatic suspension, the action Before 15HP H Normally cars rely on springs or the spring time blades, to act as shock absorbers, protecting passengers jolts the car experiences to the imperfection of the road Yet here was a system that claimed to do away with this and also offer the dynamism and superior ride quality for simple damper spring and shock have been replaced by a sphere which has been filled with gas trapped on one side and an incompressible hydraulic fluid and which was connected to the suspension from each other.
The system has gained a reputation of high complexity and lack of reliability, but actually works based on a physical principle that everyone knows, that tells us that the gas is compressible fluid isn t essentially Thus, compression gas acts as a spring, while the hydraulic fluid acts as a damper Citroen also skillfully used a pump for the self-leveling car, while providing a variable height of pipe jacking assisted change the tire and roller zero simply pushing more of hydraulic fluid in the suspension to a specific corner of the car.
In the Traction Avant, the first system devised by employee Citroën Paul Mages during the Second World War was used by the rear suspension, but the design has shown real potential, and he was soon launched on a mass production car, the one we know today as an icon of design in 1955, Citroën launched the DS DS19 It was announced as a rocketship and they really go all-out.
On Citroen DS, a belt drive, the hydraulic pump 7-piston is driven by the motor and pressure condition for the LHS specially developed hydraulic fluid which not only motivated the suspension but also the steering, the brakes and the gearbox and clutch assembly the DS was also advertised as being capable of having a ride height across between 9 and 28 cm.
But how did they do every wheel was attached to a control arm The swingarm movement pushes the hydraulic fluid in terms compresses the gas into a sphere Both are separated from each other by a flexible membrane The major advantage of this system is that the nitrogen gas nonlinear deflection strength features to put it simply, if a normal suspension springs only had it bounce long after each bump that is what the dampers on our cars are there for, but Citroen's system eliminates this need.
Cars with the hydropneumatic suspension system has five or six spheres, one for each corner, a main battery and sometimes another sphere for the braking system, which must be independent for reasons of safety, however, up nine ten cylinders can be used, for example, the Citroën Xanta 90s had an extra ball for each axle.
Each axle that could be put into or out of the system to make the damping harder or softer Xanta The MacPherson strut front and trailing arms in the rear, showing the hydropneumatic suspension could adapt to modern facilities.
While turning cars also tend to focus on a corner This makes driving a bit uncomfortable, you can buy the hydropneumatic suspension system can keep doing all the right and the level and pump it online the pressurized hydraulic fluid according wedge is pressed down, filling the tank and lift the emergency suspension These corrections are controlled by valves on older cars and electronic sensors on modern adjustments are made for a period to not to correct the regular suspension travel.
On the so-called elk test, a simple slalom for you and me, the system provides accurate control of the body to the right, while cars with simple steel springs swing violently and sometimes crash, leaning too hard .
Once the additional liquid is not necessary when the car is unloaded, the driver wants to lower or the Citroen is not cornering, it is returned to the tank by low pressure return lines.
The system is innovative because it could have acquired a reputation for reliability, because it was actually released before it is really ready LHS hydraulic fluid used by the system tended to absorb water, which gave place to corrosion the problem was intensified by the fact that the tank was evacuated to allow the fluid level to change when it was pumped around.
Citroën solves this problem with mineral oil LHM called in 1967 for the DS This means the pipes corrode and keep the dust in the air to destroy the system over time, they have introduced a filter and you also change oil and regular intervals only specialized mechanics did, and Citroen has become known as a car brand a bit special, mainly because you can t service everywhere.
But Citroen stuck with this system and evolved over time In 2001, Hydractive 3 was launched with the Citroën C5 This eliminated the need for a central pressure generator They introduced electric adjustment of sensor height and pump units and sphere the new hydraulic fluid LDS is also much better than before, which requires more rare interview.
Despite its flaws, the system was packed with benefits that attracted other automakers Citroën Rolls Royce license system in 1965 Mercedes Benz tried his hand with air suspension, which used air pumps to increase the rigidity of suspension, but in 1974 it was brought on June 9 450SEL with hydropneumatic suspension Peugeot also used the system 405 to 1990.
He may have his faults, and some people say it makes them sick, but it is the largest effort in the suspension design it was for the guys from Citroen, like going forward on a magic carpet fluid Creative Technology hydraulic indeed.
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