Instrumented steering wheel for accurate ADAS development 2019-01-1241
The knowledge of the forces exerted by each hand of the driver at the steering wheel is useful for a better understanding of the driver steering action. This information is needed while developing haptic steering wheels useful for tuning Advanced Driver Assistance Systems (ADAS).
The actual forces applied by the driver’s hands can be measured by means of a new Instrumented Steering Wheel (ISW), that, by using two six axis load cells, can measure the three force components and the three moment components exerted by the two hands, separately. Additionally, the instrumented steering wheel allows to measure the grip force, defined as the holding force applied by each hand on the handle. A full compensation of the inertia forces due to the vehicle acceleration guarantees an extremely high level of accuracy in the measure of the forces exerted by the driver. The resolution is just 0.1 N.
The ISW has been already used for a couple of ADAS activities.
The first activity refers to monitoring the driver behaviour during driving tests on a track equipped with a kick-plate. The ISW was installed on an instrumented road vehicle. The aim was to use both the vehicle states and the ISW data for evaluating the driver behaviour.
The second activity refers to the use of haptic ISWs, able to improve the ADAS systems. Actually, by including an ISW, it seems possible to infer the driver steering purpose before the steering wheel is rotated. ADAS could greatly benefit from a prompt detection of driver steering purpose. It is envisaged the possibility to estimate both magnitude and turning direction, before the steering wheel is actually moved.
Gianpiero R M Mastinu, Massimiliano Gobbi, Francesco Comolli, Masatoshi Hada
Politecnico di Milano, Toyota Central R&D Labs