【摘要】 针对混合动力汽车模式切换过程中出现的冲击度大、平顺性差等问题,以双行星排式混合动力汽车为对象,进行了发动机启动过程控制策略的研究。首先,对双行星排式动力系统结构和特性进行了分析,并采用隔离法建立了动力系统的动力学模型;然后,以减少车辆纵向冲击度为目标,基于模型预测控制算法,制定了模式切换时的动态协调控制策略;最后,利用仿真模型对动态协调控制策略进行仿真验证。仿真结果表明:相比于无协调控制和传统比例-积分-微分控制,采用模型预测控制方法时,发动机启动时间从0.7 s缩短至0.4 s,模式切换时,整车纵向冲击度的峰值由15.43 m/s~3降至3.12 m/s~3,最大车速偏差从1.98 km/h减小至0.28 km/h,此控制方法有效地保证了汽车的动力性和行驶平顺性。更多还原

【Abstract】 Aiming at problem of large impact and poor smoothness in the hybrid vehicle mode switching process,the dual-planet hybrid electric vehicle was used to improve the mode switching quality,and the dynamic model of the power system was established with isolation method. Firstly,the structure and characteristics of the dual planetary power system were analyzed,and the dynamic model of the power system was established.Then,the torque coordination control strategy based on model predictive control was proposed to reduce the longitudinal impact degree of the vehicle. Finally,the simulation model was used to verify the torque coordination control strategy.The results show that compared with uncoordinated control and traditional proportion integration differentiation( PID) control,when the model predictive control method is adopted,the engine start time is shortened from 0.7 s to 0.4 s,the peak value of the longitudinal impact degree is reduced from 15.43 m/s~3 to 3.12 m/s~3,and the maximum speed deviation is reduced from 1.98 km/h to 0.28 km/h.This control method effectively guarantees the power performance and driving comfort of vehicle.更多还原