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Appl. Sci. 2017, 7(12), 1261; doi:10.3390/app7121261

Off-Line Optimization Based Active Control of Torsional Oscillation for Electric Vehicle Drivetrain

1
National Engineering Laboratory for Electric Vehicles, Beijing Institute of Technology, Beijing 100081, China
2
Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081, China
3
Faculty of engineering and IT, University of Technology Sydney, 15 Broadway, Ultimo, NSW 2007, Australia
*
Author to whom correspondence should be addressed.
Received: 26 September 2017 / Revised: 25 November 2017 / Accepted: 29 November 2017 / Published: 4 December 2017
(This article belongs to the Section Mechanical Engineering)

Abstract

As there is no clutch or hydraulic torque converter in electric vehicles to buffer and absorb torsional vibrations. Oscillation will occur in electric vehicle drivetrains when drivers tip in/out or are shifting. In order to improve vehicle response to transients, reduce vehicle jerk and reduce wear of drivetrain parts, torque step changes should be avoided. This article mainly focuses on drivetrain oscillations caused by torque interruption for shifting in a Motor-Transmission Integrated System. It takes advantage of the motor responsiveness, an optimal active control method is presented to reduce oscillations by adjusting motor torque output dynamically. A rear-wheel-drive electric vehicle with a two gear automated manual transmission is considered to set up dynamic differential equations based on Newton’s law of motion. By linearization of the affine system, a joint genetic algorithm and linear quadratic regulator method is applied to calculate the real optimal motor torque. In order to improve immediacy of the control system, time consuming optimization process of parameters is completed off-line. The active control system is tested in AMEsim® and limitation of motor external characteristics are considered. The results demonstrate that, compared with the open-loop system, the proposed algorithm can reduce motion oscillation to a satisfied extent when unloading torque for shifting. View Full-Text
Keywords: active control; torsional oscillation; electric vehicle drivetrain active control; torsional oscillation; electric vehicle drivetrain
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lin, C.; Sun, S.; Walker, P.; Zhang, N. Off-Line Optimization Based Active Control of Torsional Oscillation for Electric Vehicle Drivetrain. Appl. Sci. 2017, 7, 1261.

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