Mercedes-Benz brings steer-by-wire to production EQS

Mercedes-Benz will offer steer-by-wire technology on the updated EQS electric saloon, making it the first German automaker to bring the system to a production vehicle. The technology, which replaces the mechanical connection between the steering wheel and front wheels with electronic signals, will be available on the EQS in combination with all powertrains and the model’s 10-degree rear-axle steering system.

The steer-by-wire system eliminates unwanted road surface vibrations from the steering wheel while maintaining steering feel through model-based calculation of tyre-road contact forces. A flattened, more compact steering wheel is used in place of the conventional design, improving the view of the driver display and easing entry and exit. The system has completed more than one million test kilometres across test benches, tracks and public roads.

A redundant signal architecture with two independent signal paths ensures steering capability is maintained in the event of a system fault. In the unlikely event of complete failure, lateral control remains possible through rear-axle steering and wheel-specific braking interventions via the electronic stability programme.

The compact steering wheel required a newly developed airbag structure, as the inflating bag can no longer brace against a closed steering wheel rim. An internal support and folding architecture controls the airbag’s shape during deployment, while meeting unchanged restraint and safety standards. Electromechanical steering remains available as an alternative.

Source: Mercedes-Benz