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Active Rear Axle Steering on the Road to Success

  • The 100,000th AKC system (Active Kinematics Control) rolls off the line just four years after starting production of active rear axle steering.
  • Production milestone strengthens ZF's leadership in steerable rear axles, an increasingly common feature in passenger cars worldwide.
  • AKC is an example of ZF’s forward-looking, intelligent mechanical systems. It is also the trigger for change Lebring, a former axle assembly plant which has now become one of ZF's high-tech sites.

Friedrichshafen/Lebring (Austria). With Active Kinematics Control (AKC), ZF has become a market leader for active rear axle steering (RAS) in passenger cars and is constantly expanding its offering. The company has now produced more than 100,000 units – just four years after starting volume production of its AKC system for two exclusive sports car models. Seven premium vehicle manufacturers meanwhile enjoy the benefits of this ZF chassis innovation in volume production. The technology helps electric or conventional passenger cars become significantly safer, more dynamic, maneuverable and comfortable. Automated and autonomous driving are deemed to be considerable growth drivers for ZF’s AKC system in future.

"Our production milestone of 100,000 AKC systems is a huge success in four different respects," says Dr. Holger Klein, Executive Vice President of the Car Chassis Technology Division at ZF. "First of all, it illustrates that our innovation allows almost any vehicle to benefit relatively easily from active rear axle steering. Secondly, ZF cements its position as market leader and technology leader in this product segment. Thirdly, every AKC unit installed depicts the forward-looking potential of intelligent mechanical systems in the automotive industry. And last but not least, this milestone highlights the exemplary transformation of the ZF production location in Lebring." The site, which is located near to Graz, quickly transformed from an axle assembly plant to a hub for high-tech mechatronics. It is currently the company's only AKC production site and has allowed for the creation of a number of new jobs.

Two concepts for different axle designs

The 100,000 AKC systems produced to date include 60,000 central actuator systems and 40,000 dual-actuator systems. The latter always have two actuators, one on each rear wheel. This version celebrated its premiere in series production in 2013 in the Porsche 911 Turbo and 911 GT3 models. The Ferrari GTC4Lusso also carries the dual-actuator version. Other vehicles, such as the recent Porsche Panamera, feature the AKC version with a single, larger actuator, which is located in the middle of the rear axle. This system also helps steer the rear of SUVs like the Audi Q7 and sedans like the Cadillac CT6 and the BMW 7 Series. So the AKC system still has a way to go before reaching the limits of its application spectrum. In the near future, the ZF system should find its place in many more models with a growing number of manufacturers including pick-up trucks and compact cars. AKC can be combined with every type of drive system – from conventional internal combustion engines to hybrids and all-electric systems.

Agile and stable

The general operating principle remains the same: When driving slowly through narrow streets, AKC steers contrary to the front wheels' steering angle and generates a higher yaw rate for the vehicle. This can reduce the turning radius by up to ten percent, so a passenger car becomes substantially easier to maneuver. At higher speeds, i.e. about 60 km/h and above, as well as during obstacle-avoidance maneuvers for example, the system steers the rear wheels in the same direction as the front wheels which improves directional stability and driving dynamics.

Ready for the car of tomorrow

The steady growth in demand for AKC from OEMs is also based on the fact that the active rear track adjustment serves all current and upcoming megatrends in the automotive industry: It greatly improves safety, especially in critical driving situations and when braking. Additionally, it is highly efficient "by wire" as well as based on the "power on demand" principle. Furthermore, AKC supports automated driving and the necessary system redundancy, as it can even partially steer a vehicle without turning the front wheels. Consequently, ZF has set high sales expectations for this product. "In 2014, the first full production year, approximately 12,000 AKC systems left our production lines and over 100,000 units have been produced to date. In the coming years, we plan to increase production volumes to more than 250,000 units per year," says Peter Buckermann, Head of the Mechatronic Systems Product Line.

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Active Rear Axle Steering on the Road to Success

Friedrichshafen/Lebring (Austria). With Active Kinematics Control (AKC), ZF has become a market leader for active rear axle steering (RAS) in passenger cars and is constantly expanding its offering. ...

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ZF AKC

Prime example of intelligent mechanical systems: ZF's active toe control kinematics AKC makes rear axles on passenger cars part of the steering system and serves all current and future megatrends in the automotive industry.

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ZF AKC Function

The AKC principle: The ZF system provides various responses depending on the road speed – to improve a car's safety, comfort, maneuverability and driving dynamics.

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ZF AKC Production Lebring

High-tech mechatronic manufacturing: AKC production at the ZF plant in Lebring, which has also taken on engineering functions.

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Press contact

Thomas Wenzel
Director External Communications
Phone: +49 7541 77-2543
thomas.wenzel@zf.com

Corina Tews
Technology and Product Communications
Phone: +49 7541 77-8238
corina.tews@zf.com