Modelling and mode switch stability criterion research of power-split hybrid transmission system

Abstract

Dynamics and stability control are the key factors to determine mode switch characteristics of multi-mode powerslpit hybrid transmission which has been extensively applied in heavy-load vehicles as an innovative power-split transmission technology of hybrid electric vehicle. Based on cooperative work between the diesel engine with variable-speed governor and the generator with torque control, a dynamic model of time-varying nonlinear system is developed and stability criterion for mode switch of the powertrain system can be derived using center manifold theorem. The simulation results illustrate that both the load torque and torque response time of the generator are the critical factors affecting the stability properties of the mode switch. In addition, the mode switch quality determined by the hydraulic pressure characteristics of brake is also validated.

Control optimization of a compound power-split hybrid power system for commercial vehicles

“…2 HEVs based on the mechanical architecture can be classified into three categories: series, parallel, and power-split hybrids. 3 The Power-split architectures are the most successful and represent a large portion of the current population of HEV powertrains. 4 Further, with the engine torque and speed independently of the vehicle wheels torque and speed, the power-split transmission has more flexibility to adjust the engine operation based on working conditions, compared with the previous two configurations.…”