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research-article

Optimal Design of Single-mode Power-split Hybrid Tracked Vehicles

[+] Author and Article Information
Zhaobo Qin

Department of Automobile Engineering, Tsinghua University, Beijing, China; Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI
qzb13@mails.tsinghua.edu.cn

Yugong Luo

Department of Automobile Engineering, Tsinghua University, Beijing, China
lyg@tsinghua.edu.cn

Keqiang Li

Department of Automobile Engineering, Tsinghua University, Beijing, China
likq@tsinghua.edu.cn

Huei Peng

ASME Fellow, Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI
hpeng@umich.edu

1Corresponding author.

ASME doi:10.1115/1.4039687 History: Received April 24, 2017; Revised March 14, 2018

Abstract

Hybrid tracked vehicles are common in construction, agriculture and military applications. Most use a series hybrid powertrain with large motors and operate at a relatively low efficiency. Although some researchers have proposed power-split powertrains, most of these would require an additional mechanism to achieve skid steering. To solve this problem and enhance drivability, a single-mode power-split hybrid powertrain for tracked vehicles with two outputs connected to the left and right tracks is proposed. The powertrain with three planetary gears would then be able to control the torque on the two tracks independently and achieve skid steering. This powertrain has three degrees of freedom, allowing for control of the output torques and the engine speed independently from the vehicle running speed. All design candidates with three planetary gears are exhaustively searched to obtain the optimal design. Efficient topology design selection with parameter sizing and component sizing are accomplished using the enhanced progressive iteration approach to achieve better fuel economy using downsized components.

Copyright (c) 2018 by ASME
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