Title: Coordination control during mode transition for a single-shaft parallel hybrid electric vehicle
Authors: Bo Du; Xiaofeng Yin; Yonggang Liu
Addresses: School of Automobile and Transportation, Xihua University, Hong guang town, Pixian, Chengdu 610039, China ' School of Automobile and Transportation, Xihua University, Hong guang town, Pixian, Chengdu 610039, China ' State Key Laboratory of Mechanical Transmission, Chongqing University, No. 174, Shazhengjie Street, Shapingba District, Chongqing 400044, China
Abstract: When the single-shaft parallel hybrid electric vehicle (PHEV) switches from pure electric driving mode to hybrid driving mode, owing to the transient process of engine starting and clutch engagement during mode transition, the system output torque fluctuates significantly, resulting in a larger vehicle jerk that severely degrades the vehicle drivability. In this paper, a phased coordination control strategy of power sources and clutch is proposed to address the problem. The mode transition process was divided into four consecutive phases. The phased coordination control strategy of engine, motor and clutch was developed based on the method of feed-forward and feedback composited control, the effectiveness of the proposed control strategy was verified by simulation comparison. The results show that compared with the conventional control strategy, the maximum vehicle jerk and the clutch friction loss are reduced by 38% and 17% respectively by using the phased coordination control strategy.
Keywords: PHEV; parallel HEVs; hybrid electric vehicles; mode transition; coordination control strategy; feedforward control; feedback control; vehicle drivability; output torque; vehicle jerk; engine control; motor control; clutch control; clutch friction loss; hybrid vehicles.
International Journal of Electric and Hybrid Vehicles, 2016 Vol.8 No.3, pp.255 - 269
Received: 06 May 2016
Accepted: 20 Jul 2016
Published online: 27 Oct 2016 *