  Combining the advantages of standard bicycles and electrified vehicles,
electric bikes (e-Bikes) are promising vehicles to reduce emission and traffic.
The current literature on e-Bikes ranges from works on the energy management to
the vehicle control to properly govern the human-vehicle interaction. This last
point is fundamental in chain-less series bikes, where the link between the
human and the vehicle behavior is only given by a control law. In this work, we
address this problem in a series-parallel bike. In particular, we provide an
extension of the virtual-chain concept, born for series bikes, and then we
improve it developing a virtual-bike framework. Experimental results are used
to validate the effectiveness of the solutions, when the cyclist is actually
riding the bike.
