In the event of an imminent side impact at more than 25 km/h (15.5 mph), the suspension actuators raise the body on the exposed side by up to 80 millimeters (3.1 in) within half a second.
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The system uses the sensors networked in the central driver assistance controller (zFAS) to detect risks of a collision around the car. In combination with the Audi pre sense 360˚ safety system, the active suspension also enhances passive safety. Its average power consumption is between 10 and 200 watts. This significantly reduces the system’s energy consumption. The active suspension settles the superstructure by continuously adding energy to or removing energy from the body depending on the respective driving situation. In “comfort” mode, however, it glides smoothly over any and all road surface irregularities. The body hardly dives at all during braking. It turns firmly into corners and body roll angles are reduced by half compared with a conventional suspension. If the driver chooses “dynamic” mode in the Audi drive select system, the car becomes a sports car. The range of ride characteristics takes on a whole new dimension thanks to the flexibility of the active suspension. This force is exerted at the front axle on the pneumatic strut of the adaptive air suspension and at the rear axle, on the transverse link. The force is transferred from the end of the roll bar to the suspension via a lever and a coupling rod. This bar is more than 40 centimeters (15.7 in) long, roughly 22 millimeters (0.9 in) thick and, despite its high strength, can be twisted more than 20 degrees. The tube houses and is rigidly joined to a pre-tensioned titanium roll bar. A belt drive and compact strain wave gearing step up the torque of the electric motor to 1,100 Nm (811.3 lb-ft) and transfer it to a steel rotary tube. One power electronics unit per axle processes them for the electric motors. The electronic chassis platform (ECP) sends control signals to the active suspension every five milliseconds. The system therefore actively controls the position of the body in every driving situation.įor each wheel there is one electric motor supplied by the 48-volt primary electrical system. It can increase or reduce the load on each wheel individually to adjust to the road as needed. The predictive active suspension is a fully active, electromechanically operated suspension system.
It uses steering interventions at the front and rear axles to stabilize the car at the driving limits – during understeer, oversteer and load changes – or when driving on roads that are slippery only on one side. The dynamic all-wheel steering receives its commands from the electronic chassis platform (ECP). Through the combination of dynamic steering and rear axle steering, the overall steering ratio varies from 9.5:1 to 17.0:1 – direct at low speeds, stable at high speeds.Īs with all-wheel steering, dynamic all-wheel steering is integrated into the Audi drive select dynamic handling system, where its characteristics and ratio can be adjusted in three stages. The strain valve gearing of the dynamic steering system on the front axle varies its ratio depending on the driving situation. It combines direct, sporty steering response with unshakable stability, resolving an age-old conflict of aims. It revisits the limits of what is physically possible, as it allows the steering angle of the front and rear wheels to be adjusted independently. The next evolutionary stage of the system is the dynamic all-wheel steering. Turning in the same direction improves the steering response and further increases stability in evasive maneuvers. At higher speeds the rear wheels follow the movement of the front wheels. The car thus becomes significantly more agile, and its turning radius smaller by roughly one meter (3.3 ft) – as noticed quite clearly by the driver during maneuvering and parking. At low speeds, the rear wheels turn in the opposite direction. Installed at the rear axle is a steering system with electrical spindle drive and two track rods that turns the wheels a few degrees in the same or opposite direction relative to the front wheels, depending on the driving speed. All-wheel steering makes the car highly manageable with maximum stability.
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