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Citroen Activa II - Prototype 1990.
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Oseća li se to XM u dizajnu "aktive"? Daj gordi malo više informacija. Jeli to koncept malo ili veliko serijski auto (ovo zadnje sumnjam)Što više za što manjeComment
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To je prototip Activa II iz 1990-te.
Auto, kojeg je provozao i svenemački "Auto Motor und Sport" magazin i ostao ovako:
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Naravno, takvi su ostajali posle svakog citroenovog vozila. Ima li malo detalja ili moram da googlam?Što više za što manjeComment
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Evo malo podataka:
Activa II prototype model was presented on the 1990 Paris Motor Show. According to LJK Setright's article published in February 1991 issue of Car, with this car Citroлn aimed to get publicity to their ultimate solution to the problem of car body roll that occurs during cornering. The previous attempts to control roll had been compromises between ride comfort and anti-roll efficiency.
The problem of driving across uneven surface that raises or drops only a single wheel per axle had not been solved at all before Citroлn's solution meant that most serious all terrain vehicles did without anti-roll bars. In an event like the one described earlier a car possessing a suspension with a rigid link between the sides of an axle has the effect of creating unnecessary roll and possibly throwing it out of direction.
Activa 2 introduced the journalists a possibility to test a latest version of Citroлn's active anti-roll system in practice. This meant that it did without the other experimental systems that were fitted to its predecessor Activa 1.
Activa 2 was a very well finished car for a prototype and satisfied the preconceptions a driver used to luxury Citroлns might have. The fact that this was a one-off hand-built car plagued by excessive weight meant that its engine coupled with an unique push button operated automatic transmission didn't give it a sports car performance. It's mission as a demonstrator it was however perfectly able to perform.
The extremely streamlined shape of the car would probably have aided the car to achieve a higher top-speed than the XM, which it was based on if the Citroлn people had allowed such extravagant attempts to happen. Another aid was of course its active suspension. This altered the ride height dynamically depending on speed. A version of the suspension has now found its way to production models.
The forte of this car and the one feature that mostly interests a sporty driver must be the active anti-roll system. Using an extra set of spheres familiar from various Citroens since the DS and some sensors and electronic management the system managed to anticipate the possible roll taking place and depending the degree of it either woke up to prevent the effects or stood still. If only one wheel rose or sunk to follow the contours of the surface the body remained relatively undisturbed from this occurrence, because the link between the left and right suspension arms was flexible enough to allow that side of the suspension to work truly independently. However if the sensor anticipated a genuine change in direction to be taken place the link transformed to a rigid anti-roll bar. To take further advantage of this activity a degree of compensation was created to take care of the minimal amount of roll due to compressed tyre.
In my opinion, the gift this car gave to car designers of the future, was that they won't have to think about the effects of body roll when designing suspension components. They can therefore go on freely to pursuit whatever goals they happen to be set their minds to do be it speed, comfort or all terrain manoeuvrability. So far this system as described here has found its way only to Citroлn's own Xantia.
Mercedes-Benz has however created a similar system for their GT oriented CL model.
Izvor:
A evo i tehnickih podataka:
2975cc V6 24 valves
200bhp @ 6000rpm
260 Nm @ 3600rpm
weight 1748 kg
top speed ~250km/h
(drag coefficient ~0.25)
isti izvor.Što više za što manjeComment
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