Title: Fuzzy logic torque control system in four-wheel-drive electric vehicles for active damping vibration control

Authors: Ziyou Song; Jianqiu Li; Zhibin Shuai; Liangfei Xu; Minggao Ouyang

Addresses: State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China ' State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China ' State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China ' State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China ' State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China

Abstract: In contrast with the conventional vehicle, the four-wheel-drive (4WD) electric vehicle (EV) has significantly different stiffness and damping coefficients in its driveline because the motor is directly connected with the tyre hub. Moreover, the torque response of the permanent-magnet synchronous motor is about much faster than that of the engine. When the EV is subjected to the fierce acceleration, the torque is abruptly applied to the tyre hub. As a result, oscillations will occur in the driveline. In addition, oscillations may also exist when there are torque disturbances of which frequency is near the driveline natural frequency. In this paper, the dynamic interaction on the tyre/road interface is described by the non-linear relaxation length-based model and the Magic formula pragmatic model. A fuzzy logic torque control system is proposed to suppress the oscillation in the driveline. The simulation results demonstrate the effectiveness and robustness of the proposed control system.

Keywords: 4WD; four wheel drive; electric vehicles; fuzzy logic; torque control; active damping; fuzzy control; vibration control; tyre-road interface; modelling; driveline oscillations.

DOI: 10.1504/IJVD.2015.071068

International Journal of Vehicle Design, 2015 Vol.68 No.1/2/3, pp.55 - 80

Received: 24 May 2014
Accepted: 21 Oct 2014
Published online: 11 Aug 2015 *

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