A novel electronic-continuously variable transmission propulsion system using coaxial magnetic gearing for hybrid electric vehicles

Abstract

As one of the most attractive technologies for hybrid electric vehicles, the electronic-continuously variable transmission (E-CVT) propulsion system has received more and more attention. In this paper, a novel E-CVT propulsion system using coaxial magnetic gearing is proposed. It can achieve optimal fuel economy, minimum exhaust emission as well as good propulsion performance by flexibly distributing the power flows. Since the coaxial magnetic gearing can offer non-contact torque transmission, the drawbacks of low transmission efficiency, mechanical friction and audible noise aroused from the mechanical planetary gearing can be overcome. The connection topology and the operation modes of the proposed system are analyzed and discussed.