Active Suspension

Michel
Has been been experienced on a race car ?
Tks

Slt Patrick,

At this level, this technologie is experimental.



BOSE® Electromagnetic linear engine offers a very simple two points assembly. Only electric connections to the engine relate to the current and control.

The front suspension modules use modified MacPherson plate fittings and the rear ones use a front double triangle transmission to bind a linear electromagnetic engine between the body of the vehicle and each wheel.
The springs absorbers support the weight of the vehicle. Moreover, this suspensions assign a shock absorber to each wheel so to prevent the wheel from rebounding at the time of control. With the difference of the traditional shock absorbers, which transmit the vibrations to the passengers of the vehicle to the detriment of comfort, this shock absorber acts without exerting through the cockpit, thus preserving comfort.

More info (but in french) can be found here: Bose France

The installation of this suspension system being modular, the vehicle's original suspension is easily replaced.

Check-out OzGT5's Uzz32 Soarer, probably the closest thing to the Bose set-up

quote:

Originally posted by OzGT5:
Julian, it's actually a Toyota Soarer UZZ32, which is the full hydraulic suspension version of the USA Spec Lexus SC400.

No springs, shockers or sway bars, just a hydraulic ram with nitrogen accumulator at each corner, a series of G sensors and an electronic valve body to push the fluid around.

Impossible to body roll, cannot dive under brakes and cannot squat under drive loads. Also 4 wheel steer, and naturally, power assistance.

220 000 Soarer / Lexus SC series coupes made for the World market, and only 873 of them are UZZ32 hydraulic cars. Very rare.

I have 6 of them, two with supercharged engines.

Stock is +3 caster but we push it up for track use. Car runs 285's up front and 315's on the rear, so it's pretty well shod.

Yes the BOSE system is electromagnetic whereas the system Toyota fitted to the UZZ32 Soarer from 1991 - 1996 is a full active hydraulic system.

Each 'strut' is comprised of an upper and lower component. The upper is a hydraulic ram with a complex array of seals operating on a large bore shaft.

The lower component is a nitrogen accumulator which effectively becomes the 'spring'. base operating pressure is 1750 psi which can increase to 3000 psi as load comes on the accumulator.

The engine runs a hydraulic pump with a very light viscosity fluid, but of interest is that the single shaft of that pump then goes in to a second and smaller chamber on the rear of the pump, and there it spins a second much smaller pump running the power steering with normal PS fluid.

Interesting in the BOSE advert that they didnt use a Mercedes but a 1991 Lexus LS400 or Toyota Celsior. This car was optionally fitted with the TEMS system, Toyota Electronically Modulated Suspension which comprised an electrically variable damping unit inside a gas over oil shock absorber and an airbag as the spring, also variable by presure control.

I've often wondered why they used this car instead of a standard coil sprung Merc 380 or 450?