A novel shift control concept for multi-speed electric vehicles

Mo, Wenwei; Fang, Yuhong; Wu, Jinglai; Ruan, Jiageng; Zhang, Nong

doi:10.1016/j.ymssp.2018.04.017

Cited by 25 publications

(13 citation statements)

References 22 publications

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“…-Shifting mechanism was not explained in details. The latest works related to gearshifting mechanism and its control are described in [41][42][43][44][45][46][47][48][49][50]. Researchers in [41][42][43] argued that criteria for the EV motor to operate efficiently is not just the application of the multispeed discrete transmission but also smooth gearshifting process with minimum jerking and actuation power usage.…”

Section: Multispeed Discrete Transmissionmentioning

confidence: 99%

Review of the Methods to Optimize Power Flow in Electric Vehicle Powertrains for Efficiency and Driving Performance

et al. 2022

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Electric vehicles (EV) are quickly gaining a foothold in global markets due to their zero tailpipe emissions and increasing practicality in terms of battery technologies. However, even though EV powertrains emit zero emissions during driving, their efficiency has not been fully optimized, particularly due the commonly used single-speed transmission. Hence, this paper provides an extensive review on the latest works carried out to optimize the power flow in EV powertrains using multispeed discrete transmission, continuously variable transmission and multi-motor configurations. The relevant literatures were shortlisted using a keyword search related to EV powertrain in the ScienceDirect and Scopus databases. The review focused on the related literatures published from 2018 onwards. The publications were reviewed in terms of the methodologies applied to optimize the powertrain for efficiency and driving performance. Next, the significant findings from these literatures were discussed and compared. Finally, based on the review, several future key research areas in EV powertrain efficiency and performance are highlighted.

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Section: Multispeed Discrete Transmissionmentioning

confidence: 99%

Review of the Methods to Optimize Power Flow in Electric Vehicle Powertrains for Efficiency and Driving Performance

et al. 2022

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“…Mo et al proposed a new type of synchronizer called harpoon-shift, which uses a torsion spring to replace the friction cone ring of the ILRS to eliminate the speed difference. This mechanism overcomes the shortcomings of friction synchronous shifting [24,25]. However, the use of torsion springs greatly limits the range of the shift speed difference.…”

Section: Introductionmentioning

confidence: 99%

Shift Quality Optimization of Clutchless Automatic Mechanical Transmission Based on a Novel Synchronizer

Zhang¹,

Peng²,

Yang³

2021

Preprint

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The synchronizer is a key component of the clutchless automatic mechanical transmission (AMT) for electric vehicles, but the inertial lock-ring synchronizer (ILRS) commonly used there is not very suitable for pure electric vehicles. To realize the rapid and smooth shifting with little impact, a new synchronizer named pressure-controllable friction ring synchronizer (PCFRS) is researched. Initially, the mechanical characteristics of the new synchronizer are analyzed, and the advantages over the ILRS are reflected. Furthermore, the dynamic transmission formulation based on the working mechanism of the PCFRS is established. Finally, the shift effects of the two kinds of synchronizers are simulated and compared. The research shows that the PCFRS can meet the main shifting evaluation index of an AMT without complex control methods, as well as it takes only 0.2406s to finish the comfortable shifting-no speed difference shifting. The shifting quality of PCFRS is better than that of the ILRS. It lays the foundation for the use of the new synchronizer for the clutchless AMTs of electric vehicles.

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“…Gao et al [17] used feedforward and feed-back controls for the clutch and the motor to achieve a smooth shift without torque holes. Mo et al [18,19] developed a novel synchronizer "Harpoon-Shift" as an alternative to the traditional cone clutch synchronizer aiming at improving comfort and efficiency. A shifting control method based on a special step function was proposed to improve shift comfort of AMT.…”

Section: Introductionmentioning

confidence: 99%

A Novel Electric Dual Motor Transmission for Heavy Commercial Vehicles

Liang

Hao³

et al. 2021

Automot. Innov.

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As a vital vehicle part, the powertrain system is undergoing a fast transition towards electrification. The new integrated electric drive system has been widely used, especially for passenger cars. In this work, a novel electric dual motor transmission is proposed for heavy commercial vehicles. The transmission scheme is firstly introduced, which can achieve 9 different operating modes including 5 single motor modes and 4 dual motor modes. Then, the mode shift map with minimum energy consumption is designed based on the motor efficiency map and the proposed energy management strategy. The driving power is appropriately distributed between the two motors in dual motor modes under the condition of minimum power consumption. In addition, a coordinated control strategy is developed for mode shift control without power interruption. The results show that the electric dual motor transmission has advantages in power consumption and power shift ability compared with the conventional single motor automated manual transmission.

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A novel shift control concept for multi-speed electric vehicles

Cited by 25 publications

References 22 publications

Review of the Methods to Optimize Power Flow in Electric Vehicle Powertrains for Efficiency and Driving Performance

Review of the Methods to Optimize Power Flow in Electric Vehicle Powertrains for Efficiency and Driving Performance

Shift Quality Optimization of Clutchless Automatic Mechanical Transmission Based on a Novel Synchronizer

A Novel Electric Dual Motor Transmission for Heavy Commercial Vehicles

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