Automated cars such as the ESF 2019 bring the vision of accident-free driving a bit closer. However, is the era of automated and autonomous driving, we need a comprehensive safety concept with many innovative solutions, as passengers might be seated much more flexibly in the interior than they are today.
The ESF 2019 adapts itself to the situation: when it is driving in automated mode, the steering wheel and pedal cluster are retracted. Together with the level, padded floor, this can not only reduce the risk of injury in a crash, but also clearly indicates that the vehicle is in automated mode.
Coordinated interaction between the seat belts, belt tensioners, belt force limiters and airbags is a standard feature of Mercedes-Benz restraint systems. As the passengers in automated vehicles might not always be in the best possible seating position in relation to present restraint systems, new ideas are necessary.
For example, the belt system has been integrated into the front seats, so that even when the occupant is in a more relaxed position, the belt fits as closely as possible. The belt system also has an electrically powered high-performance belt tensioner. This not only tensions in PRE-SAFE® situations, but is also able to respond at the moment of impact and tension the occupant’s seat belt to an extent adequate to ensure that even when projected forward, he/she is pulled back into a more favourable, upright position.
The new flexibility in the interior requires new airbag systems with alternative installation spaces. In the ESF 2019, for example, the driver airbag is located in the dashboard, not the steering wheel. This deployment concept familiar from the front passenger airbag, plus the three-dimensional airbag shape this makes possible, allows greater coverage. For a better view of the instruments and displays, and to position the airbag where it is least obstructed, the steering wheel has a flattened upper section. The Steer-By-Wire technology in the ESF 2019 – in which steering commands are transmitted electrically and not mechanically – supports the new, slightly rectangular steering wheel geometry. As the steering ratio is now variably controllable, it is no longer necessary to cross one hand over the other on the steering wheel when steering. Manoeuvring, for example, requires significantly less movement of the steering wheel, even for a large turning angle.
Another completely new development is also due to the great seating flexibility: the integral sidebag, which deploys from the side bolsters of the seat backrest on both sides. The wing-shaped airbag wraps itself around the shoulders, arms and head of the seat occupant. Its special feature is that it not only protects the passenger on the side facing the impact. As a so-called middle airbag, it can cushion the occupant on the side not facing the impact (known as a far-side impact) and prevent him/her from moving too close to another front seat occupant.
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SOURCE: Daimler
