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

Authors: Wenlong Zhu; Changzhao Liu; Jian Luo; Yanzhao Su

Addresses: State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, 400044, China ' State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, 400044, China ' State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, 400044, China ' School of Vehicles and Delivery, Tsinghua University, Beijing, 100190, China

Abstract: 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.

Keywords: hybrid vehicle; dynamic response characteristics; powertrain system; transient conditions; rigid-flexible coupling dynamics model.

DOI: 10.1504/IJVD.2025.148173

International Journal of Vehicle Design, 2025 Vol.97 No.2/3/4, pp.337 - 368

Received: 12 Jul 2024
Accepted: 10 Jan 2025
Published online: 27 Aug 2025 *

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