Analysis of dynamic characteristics of power transmission system of P2 hybrid vehicle under transient conditions

This work aimed to investigate the dynamics of the power transmission system in hybrid vehicles under transient conditions. First, the dynamic driving torque of a four-cylinder engine and a permanent magnet synchronous motor was derived. A hybrid dynamic model of the transmission system was created, and the validity of this modelling approach was verified through experiments. Additionally, a rigid-flexible coupling dynamics model for the hybrid vehicle powertrain was developed. The results of analysing the dynamic response characteristics of different mode switching processes show that, across mode-switching conditions, the meshing torque amplitude of the gear pair on the bearing input shaft varied significantly. The study also examined the dynamic response characteristics of the continuous shift system in combined drive mode. The results showed that synchroniser engagement can cause knocking during continuous shifts, and gear pair meshing torque may reverse direction during a shift.