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Research Papers

Optimal Design of Single-Mode Power-Split Hybrid Tracked Vehicles

[+] Author and Article Information
Zhaobo Qin

Department of Automobile Engineering,
Tsinghua University,
Beijing 100084, China;
Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48105
e-mail: qzb13@mails.tsinghua.edu.cn

Yugong Luo

Department of Automobile Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: lyg@tsinghua.edu.cn

Keqiang Li

Department of Automobile Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: likq@tsinghua.edu.cn

Huei Peng

Fellow ASME
Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48105
e-mail: hpeng@umich.edu

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT,AND CONTROL. Manuscript received April 24, 2017; final manuscript received March 14, 2018; published online May 2, 2018. Assoc. Editor: Ardalan Vahidi.

J. Dyn. Sys., Meas., Control 140(10), 101002 (May 02, 2018) (14 pages) Paper No: DS-17-1216; doi: 10.1115/1.4039687 History: Received April 24, 2017; Revised March 14, 2018

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 (PGs) would then be able to control the torque on the two tracks independently and achieve skid steering. This powertrain has three degrees-of-freedom (DOF), allowing for control of the output torques and the engine speed independently from the vehicle running speed. All design candidates with three PGs are exhaustively searched by analyzing the dynamic characteristics and control to obtain the optimal design. Efficient topology design selection with parameter sizing and component sizing is accomplished using the enhanced progressive iteration approach to achieve better fuel economy using downsized components.

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Figures

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Fig. 1

Schematic diagram of the benchmark series hybrid TTD

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Fig. 2

Framework, configuration, and design generation

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Fig. 3

The overall design procedure

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Fig. 4

All possible permanent connections for a configuration

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Fig. 5

An example of (a) a configuration and (b) a design

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Fig. 6

An example of redundant designs

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Fig. 7

Maximum torque screening results

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Fig. 8

Traction and turning performance screening

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Fig. 9

Driving cycles: (a) straight driving and (b) turning

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Fig. 10

Straight driving and turning fuel economy screening

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Fig. 11

Designs with superior fuel economy compared with the benchmark series hybrid

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Fig. 12

The enhanced progressive iteration of topology designs and parameter sizing

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Fig. 13

Steps of topology design and parameter optimization

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Fig. 14

Performance of the final optimal design: (a) straight driving, (b) left turning, and (c) right turning

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Fig. 15

(a) DP results while straight driving and (b) DP results while turning

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Fig. 16

(a) Engine operation points of design (8) and the benchmark during straight driving and (b) engine operation points of design (8) and the benchmark during turning

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Fig. 17

Cumulative cost comparison

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