A Speed Control for the Reduction of the Shift Shocks in Electric Vehicles with a Two-Speed AMT

Abstract

In the present paper, a speed control algorithm with fast response characteristics is proposed to reduce the shift shock of medium/large-sized electric vehicles equipped with a two-speed AMT. Shift shocks, which are closely related with to the vehicles' ride comfort, occur due to the difference between the speed of the motor shaft and the load shaft when the gear is engaged. The proposed speed control method for shift shock reduction can quickly synchronize speeds occurring due to differences in the gear ratios during speed shifts in AMT systems by speed command feed-forward compensation and a state feedback controller. As a result, efficient shift results without any shift shock can be obtained. The proposed speed control method was applied to a 9 m-long medium-sized electric bus to demonstrate the validity through a simulated analysis and experiments.

Robust Reset Speed Synchronization Control for an Integrated Motor-Transmission Powertrain System of a Connected Vehicle Under a Replay Attack

“…Banos, Barreiro and Zhao studied the theoretical stability conditions of the reset control system under time-varying delays [19]- [24]. In vehicle system control, integrated motor transmission (IMT) powertrain system with directly combined a motor and a gearbox has shown the great potential to be one of the best transmission mechanisms for connected vehicles [25]- [32]. Moreover, the IMT speed tracking controller considering short time-varying delays has been studied deeply.…”

Robust shifting control of a motor‐transmission integrated system considering anti‐jerking and speed regulation for electric vehicles

“…Yu et al employed a sliding‐mode control for the five‐speed clutch‐less AMT in the speed synchronisation process, of which an additional boundary layer is required to deal with the chattering problems [14]. Kim et al proposed a torque compensation control combined with a speed command feed‐forward with a state feedback to reduce the speed regulation time for a two‐speed AMT in electric buses [17]. However, the present study of clutch‐free AMTs merely focus on the synchronisation phase alone, the transient shift behaviour modelling and integrated control considering both driveline jerking and speed synchronisation process have not been fully investigated.…”

Compound optimal control for shift processes of a two-speed automatic mechanical transmission in electric vehicles

“…Although the motor operation speed range is very wide, its efficiency zone is cramped and hardly meets various drive requirements of the vehicles. Recently, some research interest is focused on the applications of multi-speed transmissions to the BEVs, [1][2][3][4][5][6][7][8][9][10] multiplying wheel torque for improving stand-still acceleration performance as well as high-speed energy efficiency of the vehicles.…”

“…[11][12][13] Some two-speed electric drive topologies are sorted out to the following categories: two-speed dual clutch transmission (DCT), 6,8 twospeed planetary transmission (AT), 14 two-speed inverse automatic mechanical transmission (IAMT), 4 twospeed uninterrupted mechanical transmission (UMT), 2 and two-speed automatic mechanical transmission (2AMT). 5 Each of the propulsion configurations has both benefits and limitations on drive performance and manufacturing costs. For instance, the electric vehicles equipped with ATs and DCTs ensure no traction power interruption during gear shifts by clutch-to-clutch control, but the wet clutch packs or brake mechanisms decrease overall driveline efficiency, which also increases manufacture cost and control complexity.…”