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The results of a dynamic simulation applied to a new hybrid powertrain, called SIPRE 1, are presented regarding a new hybrid system characterized by the presence of a planetary gear train that manages the distribution of power and torque on the vehicle. The system is made up of three machines, one thermal (TE) and two electncal (ETC and EM); the thermal engine works in steady state, the ETC machine supplies the needed torque surplus and the EM machine works as generator. A computer model has been used to simulate the urban and extra-urban cycle operation of a typical city car: the dynamic simulation has been implemented in order to obtain an optimized system design. The results of this simulation will be presented in form of data curves and numerical values: the effects of varying kinematic and dynamic parameters are discussed as well as the characteristics of the electrical and thermal engines.

The search for clean automotive propulsion systems has brought to study, besides the full electric solution and the traditional hybrid schemes, a family of new hybrid powertrains, called SIPRE and introduced by PARMENIDE s.r.l. (Rome) some years ago; SIPRE is the acronym of Sistema lbrido di Propulsione con Ruotismo Epicicloidale (in Italian language), i.e.: hybrid propulsion systems with planetary gear train. Such kind of systems have been studied for four years and five different versions have been developed. The main aim of this research is the realisation of hybrid powertrains with improved performances and efficiencies; analysing the traditional series and parallel hybrid systems is manifest that an enhanced hybrid equipment can be achieved developing a system layout with the minimum number of machines and reducing the number of energy conversions between the thermal unit and the vehicle traction system.