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Investigation on hierarchical control for driving stability and safety of intelligent HEV during car-following and lane-change process

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Abstract

The longitudinal and lateral coordinated control for autonomous vehicles is fundamental to achieve safe and comfortable driving performance. Aiming at this for hybrid electric vehicles (HEV) during the car-following (CF) and lane-change (LC) process while accelerating, a hierarchical control strategy for vehicle stability control is proposed. This new approach is different from the conventional hierarchical control. On the basis of model predictive control (MPC) theory, a two-layer MPC controller is designed at the top level of the control structure. The upper layer is a linear time-varying MPC (LTV-MPC), while the lower layer is a hybrid MPC (HMPC). For the LTV-MPC controller, a control-oriented linear discrete model for HEV is established, which integrates the dynamic model with three degrees of freedom (DOF) and the car-following model. The lower-layer HMPC controller is designed on the basis of the analysis for HEV hybrid characteristics and the modelling for the mixed logic dynamic (MLD) model of the HEV powertrain. As for the bottom level, a control plant including the HEV powertrain model and the 7 DOF nonlinear dynamics of the vehicle body is established. In addition, the system stability is proven. A deep fusion of vehicle dynamics control and energy management is achieved. Compared with LC-ACC control and conventional ACC control, the simulation and the hardware-in-the-loop (HIL) test results under different driving scenarios show that the proposed hierarchical control strategy can effectively maintain lateral stability and safety under severe driving conditions. Additionally, the HEV powertrain output torque and the gear-shift point are coordinated and controlled by the HMPC controller.

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Authors and Affiliations

  1. School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang, 212013, China

    YaZhou Zhou & RuoChen Wang

  2. Automotive Engineering Research Institute, Jiangsu University, Zhenjiang, 212013, China

    RenKai Ding, DeHua Shi & Qing Ye

Authors
  1. YaZhou Zhou
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  2. RuoChen Wang
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  3. RenKai Ding
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  4. DeHua Shi
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  5. Qing Ye
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Corresponding author

Correspondence to RuoChen Wang.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51975253 and 51905219), the Program of the Youth Natural Science Foundation of Jiangsu Province (Grant No. BK20200909), the Postdoctoral Science Foundation of China (Grant No. 2020M671381), and the Natural Science Research Project of Jiangsu Higher Education Institutions (Grant No. 19KJB580001).

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Zhou, Y., Wang, R., Ding, R. et al. Investigation on hierarchical control for driving stability and safety of intelligent HEV during car-following and lane-change process. Sci. China Technol. Sci. 65, 53–76 (2022). https://doi.org/10.1007/s11431-021-1891-8

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  • DOI: https://doi.org/10.1007/s11431-021-1891-8

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