Power-on gear downshift of electric vehicles using I-AMT with an overrunning clutch

Q3 Engineering
Jinlong Hong, B. Gao, Hong Chen
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引用次数: 0

Abstract

Torque interruption of automated manual transmission (AMT) electric vehicles (EVs) can be avoided by introducing a two-speed inverse AMT (I-AMT). An overrunning clutch is designed in this study to replace the traditional gear shift mechanism. The gear shift process of the introduced two-speed I-AMT with overrunning clutch can be divided into inertia and torque phases, and the control performance of the two phases greatly affects the overall shift quality. Unlike gear upshift, power-on gear downshift produces greater vehicle jerk due to its larger torque requirement. Thus, this study introduces the structure of the overrunning clutch and validates its dynamic characteristics. Then, the dynamics and control problems during power-on gear downshift are described in detail. A control scheme is also proposed, wherein optimal trajectory tracking control is used during the inertia phase and linear feedforward control is applied during the torque phase. Lastly, simulation results demonstrate that the seamless gear downshift of the proposed transmission can be realised whilst the shift shock is kept sufficiently small.
使用I-AMT和超跑离合器的电动汽车的开档降档
自动手动变速器(AMT)电动汽车的扭矩中断可以通过引入双速逆AMT (I-AMT)来避免。本文设计了一种超越离合器来取代传统的换挡机构。本文介绍的带超跑离合器的双速I-AMT换挡过程可分为惯性阶段和扭矩阶段,这两个阶段的控制性能对整体换挡质量影响很大。与档位上升不同,开机档位下降会产生更大的车辆抖动,因为它需要更大的扭矩。因此,本研究介绍了超越离合器的结构,并对其动态特性进行了验证。然后,详细介绍了上电降挡过程中的动力学和控制问题。提出了在惯性阶段采用最优轨迹跟踪控制,在转矩阶段采用线性前馈控制的控制方案。最后,仿真结果表明,在保持足够小的换档冲击的同时,可以实现该变速器的无缝换档。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
International Journal of Powertrains
International Journal of Powertrains Engineering-Automotive Engineering
CiteScore
1.20
自引率
0.00%
发文量
25
期刊介绍: IJPT addresses novel scientific/technological results contributing to advancing powertrain technology, from components/subsystems to system integration/controls. Focus is primarily but not exclusively on ground vehicle applications. IJPT''s perspective is largely inspired by the fact that many innovations in powertrain advancement are only possible due to synergies between mechanical design, mechanisms, mechatronics, controls, networking system integration, etc. The science behind these is characterised by physical phenomena across the range of physics (multiphysics) and scale of motion (multiscale) governing the behaviour of components/subsystems.
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