aDD has two primary objectives: one is to optimise rider comfort and the other is to further improve general rideability and safety.
The system measures the energy transmitted by bumps on the road surface to the bike and adjusts the hydraulic fork calibration and shock
absorber in real time to minimise accelerations on the frame and consequently maximise comfort. To achieve maximum performance at any
fork and shock absorber operating frequency, aDD uses a patented "MIX" "comfort oriented" algorithm which combines the principles of the
well known skyhook and acceleration driven damping algorithms.
aDD has two primary objectives: one is to optimise rider comfort and, in addition to comfort, rideability is also optimised and safety is increased thanks to further software strategies which
are tied directly to the rider's actions. The system recognises different riding phases
(acceleration, throttle release, braking, constant throttle) and adjusts the baseline fork and shock
absorber settings thanks to yet another patent which allows specific hydraulic calibration curves to
be defined within the adjustment range. The great precision of the system is left to a range of
sensors which are derived from the automotive world and which allow the forks and shock absorber
travel speed to be very accurately measured. In this field, Aprilia has patented a unique solution
for measuring the travel speed of the forks using a pressure sensor.
The aDD package also includes a built in piggy back shock absorber which is electrically adjustable in spring preload
to 4 predefined settings, indicated by specific icons on the digital instrument panel: rider only, rider with passenger,
rider only with panniers and rider and passenger with panniers.
This exclusive Aprilia system is patented as is the automatic preload control mode for the rear spring. Once this option has been selected,
the system can detect the bike's load by itself (weight of fuel, rider, passenger, luggage, etc.) and automatically adjust preload to the
optimum value to balance the bike properly. This allows the rider to concentrate on riding and makes Aprilia the first motorcycle manufacturer
in the world to have introduced active suspension.