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Mode Switching and Consistency Control for Electric-Hydraulic Hybrid Steering System

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Abstract

Electric-hydraulic hybrid power steering (E-HHPS) system, a novel device with multiple modes for commercial electric vehicles, is designed to realize both superior steering feel and high energy efficiency. However, inconsistent steering performance occurs in the mode-switching process due to different dynamic characteristics of electric and hydraulic components, which even threatens driving safety. In this paper, mode-switching strategy and dynamic compensation control method are proposed for the E-HHPS system to eliminate the inconsistency of steering feel, which comprehensively considers ideal assistance characteristics and energy consumption of the system. Then, the influence of disturbances on system stability is analyzed, and H∞ robust controller is employed to guarantee system robustness and stability. The experimental results demonstrate that the proposed strategy can provide a steering system with natural steering feel without apparent inconsistency and effectively minimize energy consumption.

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Abbreviations

DOF:

Degrees of freedom

ECU:

Electronic control unit

E-HHPS:

Electric-hydraulic hybrid power steering

EHPS:

Electro-hydraulic power steering

EPS:

Electric power steering

HPS:

Hydraulic power steering

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Acknowledgements

The research presented in this work was supported by the Jiangsu Key R & D Plan under Grants BE2022053-3.

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Authors and Affiliations

  1. College of Energy and Power Engineering, 29 Yudao St., Nanjing, 210016, China

    Zhongkai Luan, Wanzhong Zhao & Chunyan Wang

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  1. Zhongkai Luan
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  2. Wanzhong Zhao
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Correspondence to Wanzhong Zhao.

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Academic Editor: Xiaodong Wu

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Luan, Z., Zhao, W. & Wang, C. Mode Switching and Consistency Control for Electric-Hydraulic Hybrid Steering System. Automot. Innov. 7, 166–181 (2024). https://doi.org/10.1007/s42154-022-00211-2

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