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Automotive Engineering ›› 2025, Vol. 47 ›› Issue (9): 1686-1699.doi: 10.19562/j.chinasae.qcgc.2025.09.005

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Deep Reinforcement Learning Control of Multi-dimensional Coupled Stability of Off-road Vehicles

Guang Xia1,3(),Shibiao Wu1,Yang Zhang2,Heng Wei1,Xianyang Liu1   

  1. 1.School of Automotive and Traffic Engineering,Hefei University of Technology,Hefei 230009
    2.School of Mechanical Engineering,Southeast University,Nanjing 211189
    3.Key Laboratory for Automated Vehicle Safety Technology of Anhui Province,Hefei 230009
  • Received:2025-02-21 Revised:2025-04-08 Online:2025-09-25 Published:2025-09-19
  • Contact: Guang Xia E-mail:xiaguang008@hfut.edu.cn

Abstract:

The operation of off-road vehicles in a variety of extreme conditions can result in instability risks, including lateral slip, longitudinal slip, and roll. Nevertheless, there are difficulties in defining the stability states of the vehicle with a precise mathematical model. Therefore, in this paper a multi-dimensional coupled stability deep reinforcement learning collaborative control strategy for off-road vehicles under extreme conditions is proposed. Firstly, indicators for evaluating stability in different dimensions are established. Concurrently, the multi-dimensional coupled stable domain is constructed, and the stable domain is divided based on the coupling relationship between tire lateral and vertical forces, and the boundary parameters between each stable domain are determined through offline tire model training. Secondly, the DDPG (Deep Deterministic Policy Gradient) deep reinforcement learning algorithm is used to construct control strategies for the interaction between off-road vehicles and the environment. The optimal weight coefficients of each dimension are output to characterize the stability status of off-road vehicles. Then, a controller for longitudinal, lateral, and roll control is designed based on a collaborative control strategy for decoupling the car chassis. Finally, the joint simulation and hardware-in-the-loop verification in CarSim and Simulink show that the multi-dimensional coupled stability control strategy based on the DDPG algorithm markedly enhances the overall stability of the vehicle.

Key words: off-road vehicle, multi-dimensional coupled stability domain, deep reinforcement learning, cooperative control, hardware-in-the-loop test