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research-article

Dynamics and control of clutchless automated manual transmissions for electric vehicles

[+] Author and Article Information
Paul D. Walker

School of Electrical, Mechanical, and Mechatronic Systems, Faculty of Engineering and IT, University of Technology, Sydney, Australia 15 Broadway, Ultimo, NSW Australia 2007
paul.walker@uts.edu.au

Yuhong Fang

School of Electrical, Mechanical, and Mechatronic Systems, Faculty of Engineering and IT, University of Technology, Sydney, Australia 15 Broadway, Ultimo, NSW Australia 2007
fang_yuhong@hotmail.com

Nong Zhang

School of Electrical, Mechanical, and Mechatronic Systems, Faculty of Engineering and IT, University of Technology, Sydney, Australia 15 Broadway, Ultimo, NSW Australia 2007
Nong.Zhang@uts.edu.au

1Corresponding author.

ASME doi:10.1115/1.4036928 History: Received September 13, 2016; Revised May 11, 2017

Abstract

This paper presents a study of the dynamics and control of clutchless automated manual transmissions (CLAMT) for the purpose of investigating the system behaviour during up and down shifts. To achieve this, a multi-body dynamic model of the proposed powertrain is implemented to simulate the transient behaviour of the system, including a DC equivalent model of the electric machine and a synchroniser mechanism model. Closed loop control of motor speed and torque are used in conjunction with synchroniser mechanism actuation to functionally achieve gear shifting without the need for a primary friction clutch. This includes nested torque-speed closed loops to implement alternative motor control functionalities at different stages of gear change. To evaluate the performance of shift control shift metrics including longitudinal jerk, vibration dose value, and shifting duration are evaluated from simulation results. These results demonstrate the most significant impact on the transient response of the powertrain results from the reduction and reinstatement of motor torque during shift control. Speed control of the motor during the shift transient directly impacts on the duration of shifting, but not the transient response of the powertrain.

Copyright (c) 2017 by ASME
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