Modeling and control of gear shifting of a non-synchronizer motor-transmission drive system

ZENG Yuanfan; CHEN Hongxu; WANG Lijun; TIAN Guangyu; ZHOU Weibo

doi:10.16511/j.cnki.qhdxxb.2020.26.018

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Journal of Tsinghua University(Science and Technology) ›› 2020, Vol. 60 ›› Issue (11) : 910-919. DOI: 10.16511/j.cnki.qhdxxb.2020.26.018

AUTOMOTIVE ENGINEERING

Modeling and control of gear shifting of a non-synchronizer motor-transmission drive system

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Abstract

Power interruptions and impacts during shifting are the main reasons restricting large-scale applications of multi-gear transmissions in electric vehicles. This paper presents a non-synchronizer motor-transmission drive system. A hybrid automaton model was used to describe the shifting characteristics using multi-body dynamics. The dynamic characteristics of the model at each stage were then used to design a shifting control strategy with active synchronization of the angular speed and the rotation angle, such that the angular speeds and the angles of the sleeve and the gear ring are precisely synchronized while shifting. Simulations and tests show that the hybrid automaton shifting model predictions are consistent with the actual process and that the shift control strategy enables the non-synchronizer motor-transmission drive system to provide fast, non-impact shifting and shortens the power interruption time to less than 350 ms.

Key words

motor-transmission drive system / gear shifting / gearshift control / hybrid systems / electric vehicles

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ZENG Yuanfan, CHEN Hongxu, WANG Lijun, TIAN Guangyu, ZHOU Weibo. Modeling and control of gear shifting of a non-synchronizer motor-transmission drive system[J]. Journal of Tsinghua University(Science and Technology). 2020, 60(11): 910-919 https://doi.org/10.16511/j.cnki.qhdxxb.2020.26.018

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