Audi: The R8 MagneRide Suspension

Nice feature on Audi R8's suspension. High-tech - like the whole car.

The MagneRide semi-active suspension uses magneto-rheological fluid to provide continuously variable real-time suspension damping control. It responds in real time to road and driving conditions based on input from sensors that monitor vehicle body and wheel motion. Audi Magnetic Ride is based on a magneto-rheological principle. When in a magnetic field, small iron particles in the suspension fluid align themselves in the direction of the magnetic flux.

The electromagnetic coil is integrated into the damper piston in such a way that when it is energized the magnetic flux runs exactly transversely to the admission ports in the damper piston. As the piston moves, the aligned iron particles cling together and create flow resistance in the flowing suspension fluid. The greater the energy applied and the stronger the magnetic field, the greater the attractive force between the iron particles, thereby creating greater resistance and damping power.

The energy is controlled in relation to driving dynamics and impulses from the road. This means for every road situation optimal damping power is available. This damping power produces - according to OEM desire - a more comfortable feel or sportier vehicle handling. The control of these dampers is done by an electronic controller that communicates with the vehicle's sensors and other chassis controllers in order to determine the prevailing driving situation in a matter of milliseconds. Because damper valving is eliminated by using magneto-rheological controlled fluid within the damper, the technology has a very short response time.

The damping force is only dependent on the power applied to the magneto-rheological fluid and can be adjusted up to 1,000 times a second. Audi uses the magneto-rheological dampers for both comfort and sport. In its basic mode, the suspension allows for a more comfortable vehicle feel. In sport mode, the vehicle offers a more responsive ride thanks to a push of a button.

Related news: Foursprung, P4MR, Audi, R8, suspension, MagneRide

Source: all4engineers

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