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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.