Title: Steering energy optimisation strategy of steer-by-wire system with dual-motor

Authors: An Wang; Chunyan Wang; Han Zhang; Wanzhong Zhao

Addresses: Department of Vehicle Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China ' Department of Vehicle Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China ' Department of Vehicle Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China ' Department of Vehicle Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

Abstract: In order to improve the fault-tolerant ability of steer-by-wire (SBW) system, a dual-motor structure is introduced. It can improve the system reliability and the steering safety. However, the redundant motor will change steering energy consumption. Therefore, a dual-motor coupling steering (DMCS) strategy is proposed to minimise steering energy while maintaining steering stability. DMCS strategy contains two layers, namely an upper stability controller and a lower energy optimisation controller. First of all, stability controller is designed to ensure the operational stability under external interference and model uncertainty. Then, the instantaneous overall efficiency is optimised based on the working point between motors and the operating principles of energy optimisation controller in various modes are analysed and designed. Lastly, simulations by Matlab and Prescan demonstrate that DMCS strategy can satisfy the stability demands at different steering conditions and realise the optimal allocation of energy between motors, thereby improving energy utilisation efficiency.

Keywords: steer-by-wire system; vehicle stability control; robust control; dual electric motors; efficiency optimisation; power split; intelligent transportation environment.

DOI: 10.1504/IJVD.2021.120394

International Journal of Vehicle Design, 2021 Vol.85 No.2/3/4, pp.115 - 138

Received: 30 Sep 2019
Accepted: 20 Mar 2020
Published online: 19 Jan 2022 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article