Int. J. of Electric and Hybrid Vehicles   »   2008 Vol.1, No.4



Title: A novel control scheme for electric vehicle EV-drive


Author: Adel Sharaf, Wen Chen


University of New Brunswick, Fredericton, New Brunswick, Canada.
Division of Engineering Technology, Wayne State University, Detroit, MI, USA, 48202


Abstract: The paper presents a novel non-linear error-driven error-scaled multi-loop dynamic speed control scheme for electric vehicle EV-PMDC drives. The proposed controller is a dynamic self-adjusting regulator to ensure satisfactory reference speed tracking, minimum inrush PMDC-motor current and minimum impact on the limited battery source capacity. It handles the inherent non linearity in the EV-drive moment of inertia, frictional coefficient and load torques. The full four motor EV-drive is fed from a DC source battery with type-B DC-DC converter (chopper) – a pulse-width modulated strategy that is fully modulated, using the non-linear multi-loop dynamic error-driven control scheme. As a comparison, a classical PID scheme is also presented. Digital simulation results show the effectiveness of the non-linear multi-loop control strategy and its robustness to tolerate load non-linearities, especially in combined inertia, frictional coefficient and load torques.


Keywords: electric vehicles; EV-PMDC drives; PID controllers; tan-sigmoid error-drive control; vehicle control; dynamic speed control; nonlinear control; self-adjusting regulator; simulation; multi-loop control; inertia; frictional coefficient;load torques.


DOI: 10.1504/IJEHV.2008.022262


Int. J. of Electric and Hybrid Vehicles, 2008 Vol.1, No.4, pp.364 - 377


Available online: 24 Dec 2008



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