Sunday, 22 April 2012

suspension system for AUDI TT (front axle)

Wheel alignment

Front axle
Toe and camber can be adjusted at the front axle. the toe-out values are adjusted at the track rods. unlike on the Audi A3, left and right camber can be adjusted separately. the camber is adjusted at the connection between the wishbone and the guide bearing. for this purpose, the holes in the guide bearing are oblong in shape.

Rear axle
the camber and toe can be adjusted at the rear axle. the adjustment procedure is the same as for the Audi A3.

Tuesday, 10 April 2012

Audi's new magnetic semi-active suspension system

Audi magnetic ride provides the right degree of damping force at each individual wheel in every situation. The control unit, supplied by complex sensing technology, constantly analyses the situation. Starting from the "Normal" setting, the driver can also activate the "Sport" mode via a button on the centre console. These two programs establish clearly distinctive characteristics.
In the basic mode – when the oil is more viscous and the degree of damping less pronounced – the TT rolls surprisingly smoothly; this is ideal for long-distance driving or uneven road surfaces. In the Sport mode, by contrast – when the oil is less viscous – it reveals an extremely dynamic character that is manifested by a resolutely firm grip of the road surface. Rolling movements are suppressed from the very moment the steering is turned even more effectively than in the basic suspension setting, and the steering response is further improved. The self-steering behaviour is further optimised by the specific stabilisation provided for each individual wheel, resulting in a driving feel reminiscent of a go-kart.
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. If the piston moves, the aligned iron particles create flow resistance in the flowing suspension fluid.

Sunday, 1 April 2012

Hydractive Suspension

Hydractive Suspension is a new automotive technology introduced by the French manufacturer Citroen in 1990. It describes a development of the 1954 Hydropneumatic suspension design using additional electronic sensors and driver control of suspension performance. The driver can make the suspension stiffen (sport mode) or ride in outstanding comfort (soft mode). Sensors in the steering, brakes, suspension, throttle pedal and gearbox feed information on the car's speed, acceleration, and road conditions to on-board computers. Where appropriate, and within milliseconds, these computers switch an extra pair of suspension spheres in or out of the circuit, to allow the car a smooth supple ride in normal circumstances, or greater roll resistance for better handling in corners. This development keeps Citroen in the forefront of suspension design, given the widespread goal in the auto industry of an active suspension system. All auto suspension is a compromise between comfort and handling. Auto manufacturers try to balance these aims and locate new technologies that offer more of both.