The new Mercedes-AMG GT Coupé - active rear-axle steering

The heart of the system consists of two electromechanical steering actuators (electric motors with spindle drive) that have no mechanical connection to the steering wheel. They replace the conventional track rods on the rear axle. This 'By-Wire' system electronically controls the rear wheels in a predefined map. The toe angle change is up to 2.5 degrees at the rear wheel in each direction. Up to 100 km/h, the rear wheels are turned in the opposite direction to the front wheels. This corresponds to a virtual reduction of the wheelbase. Advantage: The new AMG GT Coupé steers significantly more agile into corners, requires less steering work, and thus provides even more driving pleasure. Other advantages include increased maneuverability and reduced turning circle in daily driving situations - such as when turning or parking. If the Coupé is driven faster than 100 km/h, the system turns the rear wheels parallel to the front wheels (maximum steering angle then 0.7 degrees). This corresponds to a virtual extension of the wheelbase and noticeably improves driving stability. At the same time, lateral force builds up on the rear wheels much faster during changes of direction, which accelerates the response to steering commands. The active rear-axle steering not only improves handling in corners but also supports the driver in sudden evasive maneuvers, thereby increasing active safety. This makes the AMG GT easier to control at the limit.