Research on the Characteristics of a Range-Extended Hydraulic–Electric Hybrid Drive System for Tractor Traveling Systems

Hanwen Wu, Long Quan (), Yunxiao Hao, Zhijie Pan and Songtao Xie
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Hanwen Wu: College of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Long Quan: College of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Yunxiao Hao: College of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Zhijie Pan: College of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Songtao Xie: College of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Energies, 2025, vol. 18, issue 8, 1-19

Abstract: Pure electric tractors face challenges in complex operating conditions, including the excessive peak motor torque caused by frequent start–stop cycles and insufficient energy utilization. To address these issues, this study proposes a hydraulic–electric hybrid drive system for tractor traveling systems which is based on a range-extended hybrid architecture. By combining the high-torque characteristics of hydraulic drive systems with the high control precision of electric motors, a hydraulic–electric dual-power coupling model was constructed. A logic-threshold-based operating mode division strategy and a hierarchical braking energy recovery mechanism were developed. The start–stop control dynamics and energy recovery efficiency of the system during plowing and transport operations were thoroughly analyzed. The simulation results demonstrate that while maintaining its acceleration and braking performance, the proposed system achieves 18.8% and 35.7% reductions in its peak motor torque during plowing and transport operations, respectively. Its braking energy recovery efficiency improved to 48.3% and 66.4% in the two scenarios; 18.5% and 25.7% reductions in overall energy consumption were seen.

Keywords: tractor; range-extended hybrid; hydraulic–electric hybrid drive; operating mode division; braking energy recovery (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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