Authors: Chaoqing Wang; Tielong Shen; Haibo Ji; Kunihiko Hikiri
Addresses: Department of Automation, University of Science and Technology of China, Hefei 230027, China ' Department of Engineering and Applied Science,Sophia University, Tokyo 102-8554, Japan ' Department of Automation, University of Science and Technology of China, Hefei 230027, China ' Nissan Diesel Motor Co., Ltd., Japan 1-1, Ageo-shi, Saitama 362-8523, Japan
Abstract: This paper presents two braking torque control strategies for parallel powertrains of hybrid duty truck. First, a coordinated braking control scheme is constructed with three parts: braking torque distribution, feedforward compensation with the air-over-hydraulic brake, and feedback compensation with electric motor based on estimated braking torque. A simple delay controller to compensate braking torque is designed for braking with gear shifting process described in the first strategy. The second strategy is proposed using pressure between synchroniser gears as additional feedback control input to compensate the loss of braking torque for braking with gear shifting process. Switching controllers will be proposed to synthesise braking process for the two processes. And then convergence analysis for proposed two control strategies will be given based on simplified model. Finally, simulation results which was conducted on a physically scaled hybrid duty truck are demonstrated to verify the effectiveness of proposed control strategies.
Keywords: parallel powertrains; hybrid electric vehicles; HEVs; braking torque control; coordinated control; switching control; gear shifting; torque estimation; feedback control; hybrid electric trucks; simulation.
International Journal of Powertrains, 2014 Vol.3 No.2, pp.173 - 196
Received: 02 Apr 2012
Accepted: 10 Oct 2012
Published online: 21 Jun 2014 *