基于新型动力耦合构型的HEV模式切换协调控制策略研究

Research on Coordinated Control Strategy for Driving Mode Transition of HEVs Based on the New Power Coupling Mechanism

受到不同动力源响应差异及离合器非连续工作特点的影响,混合动力汽车(Hybrid Electric Vehicle,HEV)在模式切换过程中存在动力传递不连续及整车纵向冲击。针对一种采用新型动力耦合构型的混合动力汽车,研究了车辆由纯电动状态切换至发动机单独驱动的多动力源协调控制策略。此方案将模式切换过程分为5个阶段,确定了不同切换阶段的控制策略,并提出了基于模糊控制的离合器接合策略。仿真结果表明,提出的模式切换协调控制策略使整车冲击度减小了73.5%,提高了HEV模式切换过程的平顺性。

During driving mode transition,the inconsistent responses of different power sources and the discontinuous characteristic of the clutch may lead to unsmooth power transmission and longitudinal jerk for hybrid electric vehicles(HEVs).Aiming at the HEV with a novel power coupling device,the coordinated control strategy suitable for the driving mode transition from the pure electric mode to the engine driving mode was studied.The mode transition process was divided into five stages and the control strategies at each stage were designed.A clutch engagement strategy based on the fuzzy control algorithm was proposed.Simulation results show that the occurrence of vehicle longitudinal jerk is reduced by about 73.5%during the transition from the pure electric mode to the hybrid driving mode.The smoothness of the mode switching is significantly improved.