并联混合汽车状态切换过程转矩优化分配  

Optimal Torque Distribution During State-switch Process in PHEV

作　　者：严运兵[1] 崔挺[1] 

机构地区：[1]武汉科技大学汽车与交通工程学院,武汉430081

出　　处：《控制工程》2016年第5期636-641,共6页Control Engineering of China

基　　金：国家自然科学基金项目(61074036);现代汽车零部件技术湖北省重点实验室开放基金项目(2012-01)

摘　　要：并联混合动力电动汽车在动力切换过程中需要进行协调控制。以并联混合动力电动汽车在状态切换过程中总转矩不发生大的波动为控制目标,建立并联混合动力电动汽车整车动力学模型,对动力切换过程进行分析。考虑离合器接合过程中滑磨功和纵向冲击度这2个相互制约的性能指标,根据极大值原理,将二次型最优控制算法运用到传动系统控制。以总转矩波动不大为目标泛函,并以离合器压力变化率和电机转矩变化率为控制对象,设计了最优控制器并进行了仿真。仿真结果表明,动态协调控制算法能有效控制发动机和电机的动力切换过程中的转矩波动,改善车辆行驶平顺性,减小离合器磨损,保证状态切换过程中动力传递的平稳性。There exists the coordinated control issue in Parallel Hybrid Electric Vehicle（PHEV） during state-switch process.Aimed at keeping the total torque unchanging under state-switch,a dynamic model for the PHEV powertrain system is built and the process of power switching is analyzed.Considering two interactional performance criteria,the frictional sliding work of clutch and the longitudinal jerk of vehicle,a linear quadratic optimal control algorithm is applied to the powertrain system based on the maximum principle.The optimal controller is designed and simulated,in which the objective functional keeping the total torque unchanging under state-switch is established and the changing rate of engaging pressure of clutch and the output torque of the motor is selected as the control objective.The simulation results show that the dynamic coordinated control strategy can effectively reduce the torque fluctuation in state-switch process,improve the driving smoothness,minimize the clutch wear and ensure that the power transfer smoothly under state-switch.

关 键 词：并联混合动力电动汽车 行驶平顺性 动力切换 线性二次最优控制 扭矩协调控制 

分 类 号：TP18[自动化与计算机技术—控制理论与控制工程]