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In this paper the feasibility of the application of a system conceived by Järvi to a 125 cm3, four strokes motorcycle engine built by Piaggio Company is investigated. This study was carried out using a one-dimensional model built with the well known CFD 1D code Wave and validated in a previous work. An analytical study was performed on the kinematic scheme of the mechanism in order to establish the relationship between control ramp and valve lift. The control ramp shape was then optimized accordingly with the results of the fluid dynamic analysis performed through the above mentioned Wave model.

The paper presents an innovative drive-train for a small scooter, taking advantage of an hybrid (mechanical-electrical) structure. The single parts of this drive train have been dimensioned and the resulting system has been introduced in a simulation program. According to the simulation results the hybridisation is able to enhance the maximum power of the scooter by 1 kW (over 30%), without changing the fuel consumption, and to allow a pure-electric operation with a range over 11 km. Moreover, when the propulsion power comes only from the onboard batteries, and they are recharged from the electric mains, the operation cost per km is less than one half the cost of corresponding fuel consumption of a vehicle without hybridisation.