Suspension influences on a steer-by-wire torque vectoring vehicle

Conventional steering systems with a mechanical connection between steering wheel and road wheels are limited in terms of adapting the steering ratio and the steering torque in dependence of the current operating condition. Steer-by-wire systems enable to decouple the mechanical connection of the steering wheel and the road wheels, thus enabling situation-dependent feedback to the driver’s steering inputs and also the possibility of autonomous steering interventions for automated driving. Because of the high safety requirements for steering systems, steer-by-wire systems require either a fail-safe system with a mechanical fallback solution e.g. actuated with a clutch, or a fail-tolerant system, [1]. These fail-tolerant systems can be achieved for example with full redundancy of all safety-critical components, but also by using torque vectoring (TV) as a redundant steering function, [2].