Topological Graph Representation and Configuration Synthesis for Power split Hybrid Transmissions of Multi-Planetary Gear Trains

Abstract Power-split hybrid transmissions are the core components of power-split hybrid electric vehicles (HEV), and the quest for a more energy-efficient and higher-performing power-split hybrid transmission has long been the focus of study. In contrast to previously published methodologies, this paper proposes a novel approach for directly synthesizing power-split hybrid transmissions that makes use of the results of previously synthesized planetary gear trains (PGTs) rather than necessitating a re-synthesis of their PGTs. A new topological graph that can construct a bridge between the PGTs and power-split hybrid transmission has been developed, reducing the computational complexity of the synthesis process. The new topological graph is obtained by adding the topological characteristics of the power-split hybrid transmission to the PGT graph. A standard structure matrix is proposed to further screen out all the isomorphic configurations. The present method can generate various types of multi-PGT hybrid transmissions while avoiding mechanical and structural interference. The design process of configurations for power-split hybrid transmission with 3-column PGTs (3-PGT) is used as an example to prove the rationality of the method.