ZF is equipping the electric flagship ET9 from Chinese manufacturer NIO with the latest generation of its steer-by-wire system. The technology group is supplying both the steering wheel actuator for steering and for displaying the steering feel as well as the redundant steering gear actuator and the associated software.
In ZF’s steer-by-wire steering system, a mechatronic actuator between the wheels is the only source of steering power. There is no longer a mechanical connection between the steering wheel and steering gear. The steering commands are issued by a steering wheel actuator in the cockpit, which has a corresponding angle of rotation sensor. An electric drive – the so-called torque feedback unit – reproduces the natural steering feel and feedback from the road. The ZF system adjusts the steering ratio individually so that the ratio of the steering wheel angle to the wheel angle is optimally adapted at different driving speeds or situations.
It is also possible to develop new, more compact steering wheels that no longer require drivers to change their grip when parking. All in all, this leads to significantly better maneuverability, as the steering wheel angle is reduced when parking or during slow-driving maneuvers. Combined with ZF’s own AKC mechatronic rear-wheel steering, driving comfort also increases significantly in electric vehicles with an extended wheelbase. Driving pleasure is maintained – the steering feel can be adjusted from sporty and direct to comfortable and relaxed. And without a steering column, the driver’s safety is increased in the event of an accident.
ZF’s steer-by-wire technology is therefore a further development of electric power steering – ideally suited for electric and automated vehicles.
