Comparison of two series-parallel Hybrid Electric Vehicles focusing on control structures and operation modes

With the aim to significantly reduce fuel consumption and exhaust emission, hybrid electric vehicles (HEVs) are more and more developed. Among the different architecture, series-parallel HEVs have flexible mode operations and high efficiency. There are two basic kinds of series- parallel HEVs, one uses a planetary gear, and another uses two concentric arranged electric machines or one machine with the two rotors. Despite the advantages of series-parallel hybrid vehicles, the systems and their controls are quite complex. This paper aims at the comparison of their control structures and their operation modes. In order to describe the two systems and organize their control structures, Energetic Macroscopic Representation (EMR) and the inversion-based control are used in this study. The same EMR and its associated control are used to describe these two kinds of series-parallel hybrid vehicles. Some simulation results are showed, discussed and compared.