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Appl. Sci. 2019, 9(8), 1538; https://doi.org/10.3390/app9081538

Development of Transmission Systems for Parallel Hybrid Electric Vehicles

1
Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
2
Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan
3
Department of Vehicle Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
4
Department of Mechanical Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Received: 12 March 2019 / Revised: 8 April 2019 / Accepted: 10 April 2019 / Published: 13 April 2019
(This article belongs to the Section Mechanical Engineering)
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Abstract

This study investigated the matching designs between a power integration mechanism (PIM) and transmission system for single-motor parallel hybrid electric vehicles. The optimal matching design may lead to optimal efficiency and performance in parallel hybrid vehicles. The Simulink/Simscape environment is used to model the powertrain system of parallel hybrid electric vehicles, which the characteristics of the PIM, location of the gearbox at the driveline, and design of the gear ratio of a gearbox influenced. The matching design principles for torque-coupled–type PIM (TC-PIM) parameters and the location of the gearbox are based on the speed range of the electric motor and the internal combustion engine. The parameters of the TC-PIM (i.e., k 1 and k 2 ) are based on the k ratio theory. Numerical simulations of an extra-urban driving cycle and acceleration tests reveal that a higher k r a t i o has greater improved power-assist ability under a pre-transmission architecture. For example, a k r a t i o of 1.6 can improve the power-assist ability by 8.5% when compared with a k r a t i o of 1. By using an appropriate gear ratio and k r a t i o , the top speed of a hybrid electric vehicle is enhanced by 9.3%. View Full-Text
Keywords: hybrid electric vehicle; power integration mechanism (PIM); transmission system; pre-transmission hybrid electric vehicle; power integration mechanism (PIM); transmission system; pre-transmission
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Chen, P.-T.; Pai, P.-H.; Yang, C.-J.; Huang, K.D. Development of Transmission Systems for Parallel Hybrid Electric Vehicles. Appl. Sci. 2019, 9, 1538.

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